Archive

18 December 2009, Volume 29 Issue 6 Previous Issue    Next Issue
---
目录
论文


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

目录

Select

《CONTENTS》 2009, 29(6): 0-1.  Abstract ( )   PDF (2120KB) ( )   Related Articles | Metrics

论文

Select

《The Review of Vibration Analysis of Cryogenic Fluidconveying Pipes》 MO Cai-ling;GAO Kang;ZHOU Jun;TA Na;RAO Zhu-shi 2009, 29(6): 1-4.  DOI: 10.3969/j.issn.1006-1355.2009.06.001 Abstract ( )   PDF (1191KB) ( )   With the development of cryogenic technology, cryogenic liquid products are important in many fields. As representative for fluidconveying tools,pipes are widely used in industry fields. But fluid structure interaction in working liquidfilled pipes, and the vibration characteristic in cryogenic fluidconveying pipes, which have been extensively studied in the academic and engineering communities. In this paper, the typical achievements in the research field were summarized and reviewed. Related Articles | Metrics

Select

《Survey and Outlook on the Research of the Unbalanced Magnetic Pull in the Motors》 BAI Hui-yu;JING Jian-ping;MENG Guang 2009, 29(6): 5-7.  DOI: 10.3969/j.issn.1006-1355.2009.06.005 Abstract ( )   PDF (1121KB) ( )   A survey on the research of the unbalanced magnetic pull(UMP) in the motors is given in the paper. The mechanism of UMP is analyzed and summarized. The developing status of the research of UMP, especially the nonlinear UMP, is also introduced. The ways to preventing and reducing UMP are also summarized. Finally, the future research orientation of UMP is also discussed. Related Articles | Metrics

Select

《Study on Reduction of Vibration for PMBLDC Motor using Nonsingular Terminal Sliding Mode Control》 CHEN Xiao-li;SHEN Chen-jun;XU Lei 2009, 29(6): 8-10.  DOI: 10.3969/j.issn.1006-1355.2009.06.008 Abstract ( )   PDF (610KB) ( )   The problem of vibration and noise of the PMSM have been a difficult dilemma, it makes the system unstable and sometimes present the chaotic phenomenon. Advanced control method can depress vibration and noise and improve the control performance. the paper gives a design of global nonsingular terminal sliding mode controller for BLDC Motor which can makes the control system is insensitive to any disturbance. The simulation results prove the validity of the controller, and by compare with classic PID control, it has beed proved that the global nonsingular terminal sliding mode controller is more effective. Related Articles | Metrics

Select

《An Approximated Method for Calculating Residual Mass Matrix and Residual Stiffness Matrix》 DONG Xing-Jian;MENG Guang 2009, 29(6): 11-14.  DOI: 10.3969/j.issn.1006-1355.2009.06.011 Abstract ( )   PDF (898KB) ( )   A difficulty encountered when using theoretical component mode synthesis method with purely experimental data is that mass matrix and stiffness matrix are necessary in order to take the residual inertia relief attachment modes into account. Yet the mass matrix and stiffness matrix of a substructure are not always available from an experimental approach. To overcome this difficulty, the approximated expressions for the residual mass matrix and residual stiffness matrix are proposed in which the mass matrix and stiffness matrix are not needed. An improved CMS formulation is then developed for the case when taking the experimental data into account. It is based on the same formulation normally used when using analytical data. However, no need exists anymore to have the mass matrix and stiffness matrix of the substructures at the same time accounting for the residual inertia relief attachment modes. The accuracy and efficiency of the proposed CMS method are proved by a numerical example. Related Articles | Metrics

Select

《Application of Gabor Expansion in Modal Parameter Identification》 FAN Jiang-ling;ZHANG Zhi-yi;HUA Hong-xing 2009, 29(6): 15-18.  DOI: 10.3969/j.issn.1006-1355.2009.06.015 Abstract ( )   PDF (958KB) ( )   The Gaborexpansionbased time frequency filtering is employed to process measured signals before conducting parameter identification. With Gabor expansion, the local characteristics of a signal can be shown in the timefrequency domain, according to which the properties of responses are acquired and the response signals can be filtered by elimination or interception. This technique can be applied to both stationary and nonstationary signals. Attribute to this technique, more information about the signals and systems can be gained, such as the distribution of natural frequencies, energy assemble functions, quantity of properties contents in each channel. Related Articles | Metrics

Select

《Operation Dynamic Strength Measurement and Evaluation for Pipeline of Nuclear Power Plant》 GUAN Xin;LIN Lei;TI Wen-xin;XUE Fei;ZHANG Yong-qiang 2009, 29(6): 19-21.  DOI: 10.3969/j.issn.1006-1355.2009.06.019 Abstract ( )   PDF (967KB) ( )   Based on the actual measuring and analyzing, we evaluate the validity for using an Htype nog between return cooling pipe and turbocharger to alleviate the vibration level for pipeline systems of a nuclear power plant under nog relaxed and fixed conditions. The results will provide technical supports for further improvement of system vibration reduction. Related Articles | Metrics

Select

《Vibration and Noise Diagnosis of Noncrystalline Alloy Transformer》 HE Hong-jun;RAO Zhu-shi;TA Na 2009, 29(6): 22-25.  DOI: 10.3969/j.issn.1006-1355.2009.06.022 Abstract ( )   PDF (866KB) ( )   Through the experimentation of the noncrystalline alloy transformer , theoretical analysis and calculation of its finite element model ,and analyzing and exploring the vibration and noise source of the transformer, we choose the signal of the transformer vibration and noise to experiment in different frequency, receive datas ,analyze them and finally draw a conclusion that the experimental way and theoretical way have the same result that the transformer noise is not from current noise ,but from the up clamp structure which accepts prompting vibration radiating noise . That conclusion has a factual instructive suggestion for reducing transformer noise further. Related Articles | Metrics

Select

The Detection of Transformer Windings’Deformation Based on the Method of Frequency Response Analysis XU Jian;SHAO Yu-ying;JIN Zhi-jian;RAO Zhu-shi;JIANG Yi-min;Zhou Kai 2009, 29(6): 26-29.  DOI: 10.3969/j.issn.1006-1355.2009.06.026 Abstract ( )   PDF (882KB) ( )   Windings’ deformation is one of the most frequent faults for the power transformer. Based on the vibration frequency response analysis, this paper proposes a correlation coefficient of vibration frequency response curve in order to more effectively detect the windings deformation. In the experiments, the vibration frequency response method is used to detect the states of largescale power transformers windings which are manmade fault. The results analysis shows that this correlation coefficient is sensitive to the windings deformation. Related Articles | Metrics

Select

《Analysis of Fluidconveying Pipe with Transfer Matrix Method》 JIN Chang-ming;WANG Gan-cheng;GAO Kang;CHEN Ting-yan;LI Hong-guang 2009, 29(6): 30-33.  DOI: 10.3969/j.issn.1006-1355.2009.06.030 Abstract ( )   PDF (850KB) ( )   The transfer matrices of the axial, flexible and torsional modes of fluidconveying elbow pipe are deduced considering fluidstructure interaction between pipe and fluid. Calculate the modal frequency and shape of a “U” shape pipe with Transfer Matrix Method and ANSYS software respectively. The results indicate that Transfer Matrix Method is an effective way to analyze fluidconveying pipe. The effect of fluidstructure interaction can not be ignored which will depress the modal frequency of the pipe. Related Articles | Metrics

Select

《An Optimization Method of Load Identificationin Frequency Domain》 HU Jie;ZHANG Xi-nong 2009, 29(6): 34-36.  DOI: 10.3969/j.issn.1006-1355.2009.06.034 Abstract ( )   PDF (638KB) ( )   This paper proposed a new method of load identification based on optimization theory, the load spectrum is calculated by genetic algorithm, if the error between responses produced by this calculated load and have been measured is small enough, the optimized load spectrum could be considered as the real excitation，the numerical simulation result shows the effectiveness of this optimization method. Related Articles | Metrics

Select

《Distributed Load Identification of Structures Based on Surface Mobility》 JIN Ya-feng;XIE Shi-lin;ZHANG Xi-nong 2009, 29(6): 37-39.  DOI: 10.3969/j.issn.1006-1355.2009.06.037 Abstract ( )   PDF (679KB) ( )   The concept of surface mobility is introduced to study the identification of distributed loads based on SEA in the paper. The expressions of average surface mobility for the finite plate are derived. By discretizing the acting area, a numerical computation method for average surface mobility is developed. Finally, combining with the complex power method, an identification approach of load power spectrum of distributed loads from the input power of subsystem is set up. The proposed method is validated numerically through an example. Related Articles | Metrics

Select

《A Flexibilitybased New Method for Structural Damage Localization》 KANG Xing-wu;CHEN Shi-jian;LIU Yong;MA Hui-juan 2009, 29(6): 40-43.  DOI: 10.3969/j.issn.1006-1355.2009.06.040 Abstract ( )   PDF (934KB) ( )   To exist inaccurate damage location for current flexibilitybased method for damage localization，a new damage index based on the orthogonal relation between stiffness matrix and flexibility matrix is presented combining with the matrix perturbation method and the finite element method. It can obtain accurate damage location using several order modal parameters. The effectiveness and superiority of this approach is verified by a numerical simulation for the plane truss，and it will be possibly used on damage localization for complex structures. Related Articles | Metrics

Select

《Analysis of Stress and Vibration of Blade for Aero Turbocharger》 LIN Hai-ying;CHEN Meng 2009, 29(6): 44-49.  DOI: 10.3969/j.issn.1006-1355.2009.06.044 Abstract ( )   PDF (995KB) ( )   On the base of structure remodeling and aerodynamic designof micro turbocharger for aero piston engine, this paper described the stress and vibration analysis of blades for turbocharger. The results shows that in the rotation range of the rotor, the blade of compressor and turbine will work safely. Related Articles | Metrics

Select

《The Realization of the Cochlear Implant’s CIS Strategy Using Matlab》 MIN Xiao-feng;LIU Hou-guang;TA Na;RAO Zhu-shi 2009, 29(6): 50-52.  DOI: 10.3969/j.issn.1006-1355.2009.06.050 Abstract ( )   PDF (753KB) ( )   Waveform strategy based on frequency demultipcation with filter bank is an important category of speech processing strategies. This article took the continuous interleaved sampling approach (CIS) which is one of the waveform strategies, and proposed its simplified simulation model with simulink. According to the frequency range in Chinese and requirement of hardware implement，we imploved the key filter bank module. The validity and rationality of the model was confirmed by this model with simulation. Related Articles | Metrics

Select

《Effects of a Cutout inside a Rectangular Plate on the Plate Dynamics》 WANG Dong;ZHONG Xi-jian;YU Zhi-gang 2009, 29(6): 53-57.  DOI: 10.3969/j.issn.1006-1355.2009.06.053 Abstract ( )   PDF (2584KB) ( )   The effects of a cutout or hole inside a freely vibrating rectangular plate on the dynamics of an elastic plate are investigated. A general superellipse representation is employed to describe the boundary shape of the cutout, and a general FE analyzer ANSYS is used to evaluate the natural frequencies of the perforated plate. Numerical results show that the plate frequencies are highly dependent upon the shape, size, position and orientation of the cutout. Moreover, the effect is also highly related to the boundary conditions of the plate. In a practical engineering application, the design of a cutout within a thin rectangular plate deserves careful consideration so as to control the dynamic behaviors of the plate. Related Articles | Metrics

Select

《Study on State Space Equation of Active Flexible Coupled Isolation System》 XU Yang;MENG Zhuo;SUN Yi-ze;HUAHong-xing 2009, 29(6): 58-61.  DOI: 10.3969/j.issn.1006-1355.2009.06.058 Abstract ( )   PDF (899KB) ( )   Focusing on flexible coupled isolation system widely being in real engineering, a state space equation realization method is presented suitable for project control application. Aim at frequence characteristic of flexible coupled isolation system, least squares method, equation synthesis menthod and balanced truncation method are applied for obtaining state space equation in this paper. Obtained state space model provided a theoretical base for studying active control algorithm. Related Articles | Metrics

Select

《Wave Propagation Analysis in a Beam Structure Using Spectral Element Method》 PENG Hai-kuo;MENG Guang 2009, 29(6): 62-66.  DOI: 10.3969/j.issn.1006-1355.2009.06.062 Abstract ( )   PDF (1095KB) ( )   This paper presents result of application of spectral element method (SEM) for simulation of wave propagation in a beam structure and the crack is simulated by node separation method. Wave propagation characteristics in an aluminum beam structure are investigated. And the simulated results are compared with the analytical result from Lamb equation to validate the proposed model. The influence of cracks with different damage degrees to response signal are investigated and the damage detection method are studied. The conclusion can be useful for study of damage detection method based on Lamb wave. Related Articles | Metrics

Select

《Numerical and Experimental Analysis of Nonlinear Dynamics of Rotorbearingseal System》 SHEN Xiao-yao;ZHAO Mei 2009, 29(6): 67-71.  DOI: 10.3969/j.issn.1006-1355.2009.06.067 Abstract ( )   PDF (1115KB) ( )   Nonlinear dynamics and stability of the rotor bearing seal system are investigated both theoretically and experimentally. An experimental rotor bearing seal system is simplified as the Jeffcott rotor. The nonlinear oil film forces are obtained under the short bearing theory and Muszynska nonlinear seal force model is used. Numerical method is utilized to solve the nonlinear governing equations. Bifurcation diagrams, Poincar maps, spectrum plots and rotor orbits are drawn to analyze various nonlinear phenomena and system unstable processes. Theoretical results from numerical analysis are in good agreement with results from experiments. Related Articles | Metrics

Select

《The Simulation Analysis of Axial Force of the Highly Flexible Coupling’s Rubber Element》 XI Cao-liang;PENG Yi-jun;CHU Hong-sen;ZHAO Zhi-tie 2009, 29(6): 72-75.  DOI: 10.3969/j.issn.1006-1355.2009.06.072 Abstract ( )   PDF (881KB) ( )   In this paper, ABAQUS simulation software is used to establish the simulation model of rubber element of a certain type of highly flexible coupling. The axial force and axial displacement are analyzed in its working condition. The result of the simulation calculation is in accord with the calculation result by “Rivlin” theory. The method of simulation used in this paper will be helpful in the design of axial displacement compensation device for highly flexible couplings. Related Articles | Metrics

Select

《Direct Solution Method for Load Force and Jacobi Matrix of Water Guide Bearing in Turbulent Regime》 YAN Zhi-yong;LU Yi;ZHENG Tie-sheng 2009, 29(6): 76-79.  DOI: 10.3969/j.issn.1006-1355.2009.06.076 Abstract ( )   PDF (767KB) ( )   Based on the variational theory, the amended Reynolds equation of water guide bearing in turbulent regime is transformed to functional extreme value problem. Using the products of weight function and linear interpolation function as pressure function, onedimensional finite element algorithm for calculating load force and its Jacobi matrix is proposed. The umerical results show that this method can reduce the computing time remarkably with the precision guaranteed. Related Articles | Metrics

Select

《Electromagnetic Field Analysis of Control Rod Drive Mechanism》 WANG Chi-hu;YAO Wei-da;XIE Yong-cheng;LIU Gang 2009, 29(6): 80-84.  DOI: 10.3969/j.issn.1006-1355.2009.06.080 Abstract ( )   PDF (1099KB) ( )   The control rod drive mechanism (CRDM) is one of the key equipment related to reactor normal operation, safety and reliability. The CRDM structures often use magnetic jack type. The electromagnetic design is a core content in the CRDM design and key technology to ensure mechanism safe and steady operation. Based on the key technology research the ANSYS program and analysis method are verified, and the feasibility of electromagnetic field analysis with finite element is validated. According to the inputs of calculation manual for CRDM, the electromagnetic fields of lift, movable and tationary magnetic routes are computed. The electromagnetic field of CRDM integral magnetic route is analyzed. The three cases, which the current direction of lift magnetic route is uniform and opposite as the movable magnetic route's, and which the lift magnetic route is electrified alone, are computed. Related Articles | Metrics

Select

《Numerical Simulation of Vortex-Induced Vibration for 2D Square Cylinder Based on Parallel Computation for Fluid Domain》 ZHENG De-qian;GU Ming;ZHANG Ai-she 2009, 29(6): 85-90.  DOI: 10.3969/j.issn.1006-1355.2009.06.085 Abstract ( )   PDF (1547KB) ( )   Based on Fluent 6, numerical simulation code for solving aeroelastic problems is first presented by using loosely coupled method in this paper. The fluid domain can be solved by adopting serial or parallel computation method, and the structure domain is solved by adopting Newmark method, and finally the interface coupling between the fluid and structure domains is implemented through dynamic mesh technique. The calculation process and the special method to deal with the parallel computation in fluid domain are then introduced. Finally, numerical simulation of vortexexcited vibration of a 2D square cylinder at Reynolds number of 22000 is done. The computed results and the comparison with those in literatures could verify the validity of the present program. Related Articles | Metrics

Select

《Calculation Method for Galloping Characteristics of Quasioval Iced Conductor》 MA Wen-yong;GU Ming;HUANG Peng 2009, 29(6): 91-96.  DOI: 10.3969/j.issn.1006-1355.2009.06.091 Abstract ( )   PDF (1397KB) ( )   The quasioval iced conductor model was tested in TJ2 wind tunnel to obtain aerodynamic force coefficients by using HighFrequencyForce Balance (HFFB) technique. The calculating theory of galloping characteristics of SDOF is derived, which take account of natural vibration characteristics of transmission line. The effects of wind velocity, sagspanratio, span, conductor diameter on galloping critical wind velocity and amplitude are studied and approximate method to calculate galloping characteristic of quasioval iced conductor are presented at last. Related Articles | Metrics

Select

《The Study of Shape Control for Large Space Membrane Structures》 XIAN Kui-cheng;PENG Fu-jun 2009, 29(6): 97-104.  DOI: 10.3969/j.issn.1006-1355.2009.06.097 Abstract ( )   PDF (1861KB) ( )   large space membrane structures will be very flexible due to low weight requirements, which usually require strict accuracy and stability. However, the distortion of the structure can be induced by several sources, such as manufacturing tolerances and thermal gradients. Therefore the active control is needed to achieve the desired shape, including shape control and vibration control. In this paper, firstly, the error sources of shape influence and the necessity of shape control are presented. Next, this paper summarizes the current status of structural control technology for space membrane structures, including control schemes, sensors and actuators. Finally, the critical technologies of large membrane structures control are presented. Related Articles | Metrics

Select

《EMA of an aluminum plate under sound-induced excitation》 LI Lei;GUO Qi-wei;SONG Han-wen 2009, 29(6): 105-110.  DOI: 10.3969/j.issn.1006-1355.2009.06.105 Abstract ( )   PDF (1408KB) ( )   For large solar panels of spacecraft in a freehanging conditions, as a result of the structures ultralow frequency, large displacement and dense local modes, the conventional approach has inspired a variety of shortcomings, such as: low MAC and poor system stability. Based on these difficulties and in the context of modal test for large solar panels of spacecraft, this paper puts forward a non-contact soundinduced exciting method. Meanwhile, the paper designs and construct an experimental modal test, in which a rectangular aluminum plate is excited by a speaker, and the modal arameters are identified. At last, the results are compared with ones identified by traditional methods. The results provide a guiding significance for the experimental design and identification of solar panels and other large spacecrafts. Related Articles | Metrics

Select

《Analysis of Model Simplification Method in Force Limited Vibration Testing》 LI Teng-fei;WANGYa-bo;SONGHan-wen 2009, 29(6): 111-115.  DOI: 10.3969/j.issn.1006-1355.2009.06.111 Abstract ( )   PDF (1148KB) ( )   In conventional vibration test of space hardware, the acceleration input at the interface between the test article and the mounting structure is controlled to a specification which is the envelope of the acceleration peaks in the flight environment. This traditional approach of testing is known to produce great overtesting to the test article at its own resonance frequencies. An improved approach called forcelimited vibration (FLV) testing was developed and implemented at NASA Jet Propulsion Laboratory (JPL), in the 1990s. In addition to controlling the input acceleration, the FLV testing measures and limits the reaction forces between the test article and the shaker. This approach can reduce the overtesting. However, it is very difficult to derive the force data of the interface during the flight, which is supposed to be used to define the force specifications of the FLV test. So it becomes very critical to find a way to get the force specifications with the acceleration data and the dynamic model of the spacecraft. This paper derived the expression of the relationship between the interface force and acceleration using component modal synthesis method with a dynamic model of the spacecraft system. Then according to the contribution of every mode of the system to the interface responses in a certain range of frequency, we reduce the dynamic model into a complex twodegreeoffreedom system which has already been introduced in many literatures. Through this reduction process we theoretically find how the Complex TDFS method works with its simplification model. And then we analyzed the error of the method with a numerical example. Related Articles | Metrics

Select

《Dynamic Finite Element Method for Bendingtorsion Coupled Vibration of Thinwalled Timoshenko Beam》 LIU Jian-hua;WANG Xiao-yu;LI Jun 2009, 29(6): 116-121.  DOI: 10.3969/j.issn.1006-1355.2009.06.116 Abstract ( )   PDF (1211KB) ( )   The dynamic stiffness matrix for a uniform and straight thinwalled Timoshenko beam element is derived by directly solving the governing differential equations of coupled bendingtorsional vibration of beam element. The effects of bendingtorsion coupling, warping stiffness, shear deformation and rotary inertia are taken into account in the present formulations. An illustrative example on the application of the dynamic finite element method is given for a bendingtorsion coupled channel section thinwalled beam In order to obtain the natural frequencies and normal modes, the automated Muller root search method and the bisection method ombined with frequency sweep method are used to solve the frequency characteristics equation. The effects of warping stiffness, shear deformation and rotary inertia on the natural frequencies and mode shapes of the particular thinwalled beam are discussed. Numerical results demonstrate the accuracy and effectiveness of the proposed method and show the warping stiffness, shear deformation and rotary inertia can change the natural frequencies and mode shapes of the open thinwalled beam substantially. Related Articles | Metrics

Select

《Numerical Simulation of Air Spring Shock Based on Control Volume Method and Equivalent Viscous Damping Method》 ZHOU Xiang-rong;WEN Jian-ming;SUN Hong-jun 2009, 29(6): 122-126.  DOI: 10.3969/j.issn.1006-1355.2009.06.122 Abstract ( )   PDF (1033KB) ( )   Based on air spring shock experiment, equivalent viscous damping replacing the air hysteresis, air viscosity and material damping and the control volume method, the paper simulates the vibration and shock process of the air spring of different wall thicknesses with Abaqus/Explicit software. The kinetic motion of the air spring and the airbag state are simulated numerically and compared with the experiment. Good agreement between the simulation and experiment proves that the equivalent damping and control volume method can reflect the vibration and shock state of the air spring well. This paper provide an efficient prediction method to design and analyze the mechanical characteristics of airbag and analogous structures. Related Articles | Metrics

Select

《Power Flow Level Difference Finite Element Analysis》 YANG De-qing;LUO Fang;CHEN Jing 2009, 29(6): 127-131.  DOI: 10.3969/j.issn.1006-1355.2009.06.127 Abstract ( )   PDF (1132KB) ( )   Formulas on calculating power flow level difference by finite element method are presented for mechanical structures like isolator, beam, plate and combined parts. Through the computations on finite element power flow level difference and vibration level difference for the combined structure, the merits of these two kinds of evaluation methods arecompared. Computational results show that synthetic considering of vibration level difference and power flow level difference in design can get more feasible reduction effects. Related Articles | Metrics

Select

《Study on Transmission Paths in Submarine Stern Excited Longitudinally》 FENG Guo-ping;CHEN Yong;HUANG Xiuchang;HUA Hong-xing 2009, 29(6): 132-135.  DOI: 10.3969/j.issn.1006-1355.2009.06.132 Abstract ( )   PDF (1005KB) ( )   It is effective to reduce vibration of a ship stern that vibration isolation on the dominant transmission path. The transmission paths model of a ship stern was built based on the ship stern structure. When excited longitudinally at the propeller, the transmission paths of stern is analyzed and sequenced by the transmission paths analysis method. The results show that the palace at bearing basement is a dominant path when excited longitudinally. Thus, when the dominant transmission path is identified, passive control or structural modifications on the path can attenuate vibration levels effectively. The numerical results explain that the acoustic radiations of the structure can reduced by modification of the bearings rigidities and of bearing basement configuration. Related Articles | Metrics

Select

《Research on Vibration Control of Ship Drive System》 TONG Zong-peng;ZHOU Wen-jian;WANG Guo-zhi;SHEN Jian-ping 2009, 29(6): 136-139.  DOI: 10.3969/j.issn.1006-1355.2009.06.136 Abstract ( )   PDF (1061KB) ( )   The diesel propulsion system is be widely used in the dynamical system of the ship. The being vibration analysis of the drive system emphasizes particularly on the torsional vibration of the shafting. It is mostly aimed at the security of the shafting, while the effect of the structural vibration and the transfer and attenuation of the vibration energy following shafting are out of the consideration. The professional computational analysis method is short. In this paper, the researches of control technique about the structural vibration of the drive system were carried out using the elasticity couplings, rubber isolators and so on. Meantime, the virtual simulation calculation method about structural vibration of the flexible drive system was established based on the representative diesel propulsion system. Related Articles | Metrics

Select

《Study on Reducing Noise of Pressure Fluctuation Singal Adopted FastICA》 ZHU Hong;CAI Dan;LV Zhen-zhong 2009, 29(6): 140-142.  DOI: 10.3969/j.issn.1006-1355.2009.06.140 Abstract ( )   PDF (741KB) ( )   The paper submit the FastICA method to check the err and revise the date for the random err.The effection is good to remove the noise from the pressure signal sampling from the local site. Related Articles | Metrics

Select

《Modeling of Stochastic Damping Rattling System》 SUN Yi-qiang;FENG Qi 2009, 29(6): 143-146.  DOI: 10.3969/j.issn.1006-1355.2009.06.143 Abstract ( )   PDF (778KB) ( )   Rattling vibration is one kind of harmful vibration during the gears drive transmission because of the piay with in the gear meshing. In this paper, a rattling system with stochastic damping was investigated. A discrete stochastic model described by mean map was established using nonGaussian technique, and using experimental conclusion to verify the reasonable conclusion. Related Articles | Metrics

Select

《Study on Induction Noise Control for Air Compressor of an Idling Truck》 WANG Liang;LUO Hong;CHU Zhi-gang;WANG Wei-dong 2009, 29(6): 147-150.  DOI: 10.3969/j.issn.1006-1355.2009.06.147 Abstract ( )   PDF (1037KB) ( )   Many noise source identification measures show that the source of the abnormal noise of an idling truck is the air compressors induction noise. Based on this, the expansion muffler and interference muffler are designed on the inlet duct of the air compressor. The acoustic finite analysis for the inlet system including muffler, air cleaner and the inlet duct of the air compressor and the engine shows that the muffler has remarkable transmission loss. Base on these, the samples for the expansion muffler and the interference muffler are made and tested in the truck for verifying noise control effect. Result shows that the designed muffler can control the noise effectively and the interference muffler is better than the expansion one. Considering the shortage of the designed interference muffler and the characteristic that the air compressor shares the same inlet system with the engine, an engineering design for the interference muffler is present. The acoustic transmission loss and the noise control of the engineering one are also notable. Although the engineering interference muffler is a litter worse than the interference one, it avoids the shortage of the interference one that the duct is too long to choking. Lastly, an intake time testing for the gas storage is done with the engineering interference muffler, though the intake time is a bit longer, it is still better than the national standard. Related Articles | Metrics

Select

《Instability Cause Analysis and Simulation on Loaded Freight Car with ThreePiece Bogie under Abnormal Conditions》 YANGLi-jun;HU Yong-sheng;HONG Chun-lei;SUN Li-xia 2009, 29(6): 151-155.  DOI: 10.3969/j.issn.1006-1355.2009.06.151 Abstract ( )   PDF (1242KB) ( )   With the development of highspeed and heavyhaul transportation, rubber pads are applied on the axle box on some threepiece freight bogies in order to reduce the interactive force between wheel and rail and increase running stability. Generally speaking, Empty freight car is easier to derail than loaded car with increasing speed for less weight and anti-warp stiffness. However, under some abnormal condition, the instability condition can occur on loaded car. Test and dynamic simulations indicate that if the friction damping of the wedge pairs is too much higher, or the wedge pairs are blocked as the material is stuck in groove, the hunting and instability of loaded car will occurred even at lower speed. Consequently, the possibility of this kind of failure shall be considered carefully especially when the wedge with selflock angle and high friction coefficient is adopted, meanwhile, the inspection and maintenance of wedge pairs and optional material control shall be emphasized. Related Articles | Metrics

Select

《Experimental Analysis on the Ride Comfort of a Certain Offroad Ambulance Based on Magnetorheological Vibration Isolation Technology》 SUN Jing-gong;NIU Fu;GAO Zhen-hai;DUAN De-guang;REN Xu-dong 2009, 29(6): 156-160.  DOI: 10.3969/j.issn.1006-1355.2009.06.156 Abstract ( )   PDF (1196KB) ( )   A set of magnetorheological(MR) vibration isolator is developed for a certain off-road ambulance. Through application and road experiment, we attain root mean square value of vibration acceleration on supine wounded head and hip on the upper and lower stretchers based on different road conditions and different speeds. Then we obtain weighted root mean square value of vibration acceleration on whole supine body accordingly. Experiment and Analysis results show that the set of magnetorheological vibration isolator helps to improve effectively the offroad ambulance riding comfort. Related Articles | Metrics

Select

《Study on Test Method of Transmission Loss of Vehicle Muffler》 MA Jia-yi;YUAN Zhao-cheng;YU Ying-xiao;LIU Bin-chun 2009, 29(6): 161-164.  DOI: 10.3969/j.issn.1006-1355.2009.06.161 Abstract ( )   PDF (865KB) ( )   The transmission loss is one of the important characteristics to appraises the muffler performance. But in the experiment, it should been pay attention to the acoustic source stability and sound wave reflection questions.In this article summarized some differences which the insertion loses and transmits loses, Simultaneously pointed out the merits of application transmission loss test noise elimination performance，And for avoided the sound reflection proposed one new transmission loss test way. Discussed the transmission loss value change situation when the muffler be inputed different intensity sound pressure, which through the massive experiments. Related Articles | Metrics

Select

《Optimization of Interior Noise by Experimental Modal Analysis》 SHAO De-gang;ZHOU Hong;GUO Rong 2009, 29(6): 165-169.  DOI: 10.3969/j.issn.1006-1355.2009.06.165 Abstract ( )   PDF (1146KB) ( )   This paper introduces the method of modal test and analysis for vehicle roof. A single hung shaker was used to excite the roof while the car is grounded. According checking the measuring points coherence, FRF value and modes MAC value, the result of the modal test was verified. Natural frequencies and vibration mode of the first 10 orders were obtained by PolyMax method and impressible frequency to inner noise and weak position of the roof were found. Through the improvement of roof structure, the impressible frequency was evaded, the FRF value of the roof was improved obviously and the interior noise in critical rotation speed was reduced. Related Articles | Metrics

Select

《Evaluation on the Performance of the Active Platform Against Microvibration and its Efficiency on Control Force》 YU Zhe-feng 2009, 29(6): 170-174.  DOI: 10.3969/j.issn.1006-1355.2009.06.170 Abstract ( )   PDF (1141KB) ( )   Most of hitech equipments are very sensitive to microvibration. The active microvibration isolating platform is intensively investigated for years. For the ambient excitation in the active vibration control experiment cannot reappear, the response of the platform without control was simulate with the ground excitation measured in the experiment. The velocity spectrum was used to evaluate the responses of the control platform and the uncontrolled platform. The interaction force between the piezoelectric actuator and the platform was simulation with the measured responses of the structure and the constitutive equation of the piezoelectric actuator, and the obtained response is closed to the measured one therefore this method for interaction force calculation is validated. Also, with the root mean square of the interaction force and the electric field force, the efficiency of the control force is discussed. Related Articles | Metrics