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Study on the Evolution Law of the Dynamics Characteristics of Rotor Systems 2017, 37(2): 1-6.  DOI: 10.3969/j.issn.1006-1355.2017.02.001 Abstract ( )   PDF (1382KB) ( )   In this paper, a Jeffcott rotor system is established based on the impact theory and is analyzed by the modern nonlinear dynamics and bifurcation theories. The boundaries for the existence of the no-rub responses are determined analytically, and the rub solutions are derived and the stability is analyzed to determine the region of the synchronous full annular rub response. A systematic study on the influence of the system parameters such as damping radio and eccentricity on the evolution law of the dynamics characteristics of a rotor system is carried out. Several kinds of evolution are then obtained in the parameter space of damping radio and eccentricity, and given the evolution law of the dynamics characteristics of the rotor system with the changing of rotational speeds. These results provide an opportunity for a better understanding of the relationship between the system parameters and the dynamical characteristic, such as no-rub motion, the synchronous full annular rub motion, partial rub motion, the dry whip as well as the jump phenomena. Related Articles | Metrics

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Model and Dynamic Analysis of the Electro-mechanical Coupling System of Piezoelectric Vibration Energy Harvesters 2017, 37(2): 7-12.  DOI: 10.3969/j.issn.1006-1355.2017.02.002 Abstract ( )   PDF (1683KB) ( )   Related Articles | Metrics

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Dynamic Response of Axle-boxes to Rail Unevenness Excitation due to Multiple Wheel-rail Interactions and  Its Measurability Analysis 2017, 37(2): 13-17.  DOI: 10.3969/j.issn.1006-1355.2017.02.003 Abstract ( )   PDF (1537KB) ( )   Track irregularities give rise to severe wheel/rail interaction and thus the fatigue of vehicle and rail parts and railway noise, which make it a key point of track maintenance. Considering the costs of maintenance work, real-time monitoring of track unevenness becomes very important. The most frequently-used method of track condition monitoring is to double integrating the axle-box acceleration. But axle-box response is found to be influenced by various factors. To obtain a better understanding of measurement results, the dynamic behavior of axle-box response to the unevenness excitation due to multiple wheel/rail interactions is analyzed in frequency domain with “moving irregularity” model considered. Based on the analysis of axle-box response, the measurability of track unevenness is discussed. Results show that the response of axle-box to track unevenness at long wavelength is nearly ideal whereas at higher frequencies it is influenced by the standing waves formed between wheels and presents a variety of uncertainty due to wave reflections. In order to extend the range of measurable wavelength, it is suggested that the unevenness measurability via axle-box acceleration can be improved by reducing the mass of measuring wheel. Related Articles | Metrics

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Research on Analytical Method for Vibro-acoustic Response Analysis of Bi-directionally Orthogonal Stiffened Plates 2017, 37(2): 18-22.  DOI: 10.3969/j.issn.1006-1355.2017.02.004 Abstract ( )   PDF (1560KB) ( )   Related Articles | Metrics

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Simulation of Vibration of Beams Made of Damping Materials with Different Boundary Conditions 2017, 37(2): 23-27.  DOI: 10.3969/j.issn.1006-1355.2017.02.005 Abstract ( )   PDF (1593KB) ( )   Related Articles | Metrics

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Analysis of Dynamic Characteristics of Tracks Based on Welding Deformation of Roadheader Crawler Frames 2017, 37(2): 28-32.  DOI: 10.3969/j.issn.1006-1355.2017.02.006 Abstract ( )   PDF (1714KB) ( )   Related Articles | Metrics

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Design and Implementation of the Electric Drive System for Giant Magnetostrictive Micro-vibration Control 2017, 37(2): 33-37.  DOI: 10.3969/j.issn.1006-1355.2017.02.007 Abstract ( )   PDF (1835KB) ( )   Related Articles | Metrics

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Numerical Investigation of the Vibration Character of Centrifugal Fans Based on Modal Dynamics Method 2017, 37(2): 38-41.  DOI: 10.3969/j.issn.1006-1355.2017.02.008 Abstract ( )   PDF (1200KB) ( )   Related Articles | Metrics

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Numerical Analysis of Influence of Blade Type Change on Internal Aerodynamic Excitation of Centrifugal Fan Dingkejin 2017, 37(2): 42-46.  DOI: 10.3969/j.issn.1006-1355.2017.02.009 Abstract ( )   PDF (2720KB) ( )   Blade is the core part of Centrifugal fan.In order to study the effect of blade type improvement on the vibration of centrifugal fan,in this paper, the simulation and calculation of the aerodynamic excitation of a centrifugal fan.By steady calculation,it is found that the improvement of the blade type can delay the flow separation and reduce the incentive factors of induced vibration.By unsteady calculation,it is found that the effect of blade improvement on the aerodynamic excitation of centrifugal fan is mainly reflected in the improvement of pressure pulsation,especially the decrease of pressure pulsation at the blade frequency.According to the analysis results, predicte the vibration of fan，the test results show that the improvement of blade type can reduce the vibration of blade frequency and the aerodynamic analysis can provide a basis for the improved design of fan. Related Articles | Metrics

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Dynamics Analysis of Swing Arms in the Satellite-rocket Unlocking and Separation Device 2017, 37(2): 47-52.  DOI: 10.3969/j.issn.1006-1355.2017.02.0010 Abstract ( )   PDF (1731KB) ( )   Related Articles | Metrics

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Dynamics Simulation of Vibration Test System for Missile’s Multi-point Excitation 2017, 37(2): 53-56.  DOI: 10.3969/j.issn.1006-1355.2017.02.011 Abstract ( )   PDF (1525KB) ( )   Based on a closed loop control method, this paper carries out a dynamic simulation of the missile multipoint excitation vibration test system. Through the reasonable simplification of the whole system, the modal analysis and random vibration analysis of the vibration test system are carried out by using the MSC.Patran/Nastran finite element software. Finally, the response spectrum of the vibration acceleration of each control point is calculated. The results show that the test results are consistent with the simulation results, which verifies the correctness of the computer dynamic simulation. Related Articles | Metrics

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Analysis of Dynamic Characteristics of the Turbine-gearbox Coupling System 2017, 37(2): 57-61.  DOI: 10.3969/j.issn.1006-1355.2017.02.012 Abstract ( )   PDF (1476KB) ( )   Related Articles | Metrics

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Numerical Simulation of the Effect of the Gap between Rotor and Pump on the Performance of the Rotor Pump 2017, 37(2): 62-66.  DOI: 10.3969/j.issn.1006-1355.2017.02.013 Abstract ( )   PDF (1951KB) ( )   The rotor pump is a type of volume pump，it has been widely used in the treatment of domestic sewage, urban sewage sludge, high viscosity liquid and even solid liquid two phase flow for its simple structure, long life and simple maintenance. But in the manufacturing process, for there is no specific data analysis, the gap between the rotor surface and the pump body is based on experience. Based on the analysis of the linear model of the arc type cam rotor pump, the two dimensional model of the rotor pump is established. By using Fluent numerical analysis software, the distribution of flow field in the rotor pump with different gap between rotor and pump body is analyzed, and the effect of the gap on the performance of the rotor pump is obtained. Simulation result analysis show that there is a certain effect on the volumetric efficiency of the rotor and the pump body gap. Related Articles | Metrics

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Experimental Research on Hydrodynamic Noise of  a Cone-cylinder Combined Structure 2017, 37(2): 67-69.  DOI: 10.3969/j.issn.1006-1355.2017.02.014 Abstract ( )   PDF (1256KB) ( )   Related Articles | Metrics

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The Influence of Hanging Equipment on Vertical Comfort Index of High Speed Vehicles 2017, 37(2): 70-74.  DOI: 10.3969/j.issn.1006-1355.2017.02.015 Abstract ( )   PDF (1523KB) ( )   Related Articles | Metrics

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Analysis and Control of Abnormal Noise in Tractor’s Cabs 2017, 37(2): 75-79.  DOI: 10.3969/j.issn.1006-1355.2017.02.016 Abstract ( )   PDF (1769KB) ( )   In this paper, we mainly consider the abnormal noise problem in the domestic tractor cab. A method combining spectral analysis and panel participation analysis is proposed. By simulation and experiment validation, the effectiveness of our proposed method is demonstrated. Finally, the abnormal noise is reduced, and the ear noise is decreased on 2dB (A). Our proposed method can offer an effective guidance to the practical engineering. Related Articles | Metrics

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Structure-borne Noise Source Identification of an Excavator’s Cab based on Operational Transfer Path Analysis 2017, 37(2): 80-84.  DOI: 10.3969/j.issn.1006-1355.2017.02.017 Abstract ( )   PDF (1672KB) ( )   Operational transfer path analysis (OTPA) is an improvement of the traditional transfer path analysis method. So far OTPA has been widely applied in engineering machinery to analysis the transmission between vibration signals, while the application between vibration signals and noise signals is still relatively few. In order to analysis the structure-borne noise of an excavator cab, OTPA is applied with the engine vibration as the major vibration source. In addition, the singular value decomposition technique (SVD) is applied to process the input signal. The validity of the OTPA method is verified by comparing the synthetic output signal with the measured output signal. By means of the path noise contribution analysis, some noise reduction measures are proposed. Related Articles | Metrics

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Study on Structural Vibration and Acoustic Radiation of Reinforced Outer Floors with Damping Materials 2017, 37(2): 85-90.  DOI: 10.3969/j.issn.1006-1355.2017.02.018 Abstract ( )   PDF (1969KB) ( )   Acoustic soft was adopted to establish the analytical model of reinforced outer flooring on high-speed train. The influence of damping material properties on the acoustic radiation characteristics of the plate structure was investigated. And it also studied the effects of panel’s thickness, structural damping coefficient and damping material on sound transmission loss of the plate structure. The results demonstrated that increasing the damping layer thickness, but not the thicker the better, could bate the vibration radiation. The sound transmission loss of structure could be improved by increasing the panel’s thickness and the damping coefficient. But there was a critical value of damping layer’s thickness for the maximum value of the sound transmission loss. The resin damping should be chose and the structure damping coefficient should be increased for getting an ideal acoustic performance on the reinforced plate. Related Articles | Metrics

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Static Noise Prediction for the Turbofan Engine Fans 2017, 37(2): 91-94.  DOI: 10.3969/j.issn.1006-1355.2017.02.019 Abstract ( )   PDF (1711KB) ( )   Related Articles | Metrics

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Study on the Evaluation of Interior Sound Quality in Non-steady State of a Hybrid-power Vehicle wu saisai 2017, 37(2): 95-100.  DOI: 10.3969/j.issn.1006-1355.2017.02.020 Abstract ( )   PDF (1414KB) ( )   In order to evaluate the sound quality in the non-steady state of a hybrid vehicle, interior noise samples of different positions、driving modes and vehicle speeds were collected. Then, the variation of objective parameters in different non-steady states was analyzed. The results indicate that: in motor-only driving mode, the sound sharpness is suitable to evaluate the interior sound quality of non-steady state while in hybrid driving mode and engine-only driving mode, the sound loudness is more suitable to evaluate the interior sound quality ; Furthermore, based on the BP network model, an evaluation of the interior sound quality was conducted respectively in view of objective acoustic parameters and critical frequency band analytic wavelet transform. It’s shown that the latter is better than the former, and more stable. Related Articles | Metrics

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Simulation and Optimization Design of Child Safety Seats for Low Frequency Vibration 2017, 37(2): 101-106.  DOI: 10.3969/j.issn.1006-1355.2017.02.021 Abstract ( )   PDF (1504KB) ( )   Related Articles | Metrics

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Aerodynamic Noise Optimization of Vehicle’s A-pillar Based on Vortex Sound Theory 2017, 37(2): 107-112.  DOI: 10.3969/j.issn.1006-1355.2017.02.022 Abstract ( )   PDF (1820KB) ( )   Theory of vortex sound indicates that aerodynamic noise induced by the flow mainly depends on the intensity of sound source’s divergence. The research of this paper is based on the equation of vortex sound，discovering the main parameters that affects the aerodynamic noise of A-pillar by analysing the correlation between the parameters in the flow field(such as velocity, vorticity and the sign value of their angle) and the aerodynamic noise. Research shows that the sound pressure level of aerodynamic noise changes with the vector cross product of the velocity and vorticity, the vorticity around the axial of A-pillar contributes most to the noise generation. Whereafter, aerodynamic noise near A-pillar field could be controlled by adding spoilers to the surface of the pillar. The sound pressure level spectrum shows that the method can reduce the noise by 4.2dBA and works well within wide frequency band. Related Articles | Metrics

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Research on the Method of Reducing the Aircraft Lateral Effective Perceived Noise Level 2017, 37(2): 113-116.  DOI: 10.3969/j.issn.1006-1355.2017.02.023 Abstract ( )   PDF (1215KB) ( )   Related Articles | Metrics

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Analysis of Vertical Vibration Reduction Strategy for  Elevator System 2017, 37(2): 117-120.  DOI: 10.3969/j.issn.1006-1355.2017.02.024 Abstract ( )   PDF (1466KB) ( )   Related Articles | Metrics

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Influence of Temperature on Acoustic Characteristics of Extruded Aluminum with Damping Layers 2017, 37(2): 121-126.  DOI: 10.3969/j.issn.1006-1355.2017.02.025 Abstract ( )   PDF (1845KB) ( )   Related Articles | Metrics

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AHP Based Evaluation of Wind Soundscape in a Forest Park 2017, 37(2): 127-130.  DOI: 10.3969/j.issn.1006-1355.2017.02.026 Abstract ( )   PDF (1310KB) ( )   In this paper, we took Fuzhou National Forest Park as an example and used Analytic Hierarchy Process (AHP) to evaluate important factors influencing wind soundscape in forest parks by three criterion layer factors and seventeen index layer factors. The results show that：the order of the importance of criteria layer is vegetation community structure factor > plant organ factor >architectural material factor, the weights are 37.54%, 35.88% and 26.58% respectively. In the order of the importance of index layer, the sounds of wind blowing the leaves, which belonging to vegetation community structure factors of criterion layer are greater than the other 16 factors, accounting for 10.26%. It further illustrates the significance of plant main organs-leaves in evaluating wind soundscape in forest parks. This paper provides theoretical basis for the scientific and systematic development and construction of forest parks. Related Articles | Metrics

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Improvement of Wind-induced Vibration Analysis in  Time Domain Based on Shannon Sampling Theorem 2017, 37(2): 131-136.  DOI: 10.3969/j.issn.1006-1355.2017.02.027 Abstract ( )   PDF (1629KB) ( )   Based on the time history data of wind pressure obtained by synchronization pressure test in wind tunnel, there are two different methods to calculate the vibration response: time domain method and frequency domain method, from which the results obtained have some differences. To improve the accuracy of time domain method, a scheme to densify the time history data of wind pressure based on Shannon sampling theorem has been proposed in present paper. By applying this approach both to a two-degree-of-freedom system with theoretical solutions and to a practical project, the interpolated and densified data for each certain time history of load have been obtained. The responses are calculated by the processed data as well as the raw data to conduct time-domain and frequency-domain analyses. Through the comparison among those results, we come to the conclusions that: (i) For the calculation of wind-induced response, the frequency domain method can get more accurate results than the time domain method by a certain time history data of load, the differences of which come from the error of high frequency parts; (ii) By using the Shannon sampling theorem, the accuracy of the time domain method can be improved while the results obtained from frequency domain method are barely changed. Related Articles | Metrics

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A Method of Planetary Gearboxes Fault Diagnosis Based on ASTFA and SDEO Demodulation 2017, 37(2): 137-142.  DOI: 10.3969/j.issn.1006-1355.2017.02.028 Abstract ( )   PDF (1937KB) ( )   Aiming at the modulation characteristics of fault signals of planetary gearboxes, a demodulation method based on ASTFA and symmetric difference energy operator is proposed to extract instantaneous amplitude and instantaneous frequency information of fault signals. Firstly, fault signals of planetary gearboxes are decomposed into several mono-component signals by ASTFA method. Then, symmetric difference energy operator is used to demodulate the mono-component signals. Consequently, instantaneous amplitudes and instantaneous frequencies of mono-component signals can be obtained and envelope spectra can be worked out. This method is applied to analyze simulative fault signals and actual fault signals of planetary gearboxes. The analysis results prove that fault features can be extracted accurately and faults of planetary gearboxes can also be diagnosed by the method. Related Articles | Metrics

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Fault Diagnosis of Railway Bearings Based on FIR-EMD and Improved SVM Algorithm 2017, 37(2): 143-147.  DOI: 10.3969/j.issn.1006-1355.2017.02.029 Abstract ( )   PDF (1842KB) ( )   Related Articles | Metrics

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Method for Acquiring Asynchronous Vibration Frequencies of Mining Axial Fan Blades 2017, 37(2): 148-151.  DOI: 10.3969/j.issn.1006-1355.2017.02.030 Abstract ( )   PDF (1410KB) ( )   Related Articles | Metrics

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Structural Modal Parameter Identification Based on Improved Imperialist Competitive Algorithm 2017, 37(2): 152-157.  DOI: 10.3969/j.issn.1006-1355.2017.02.031 Abstract ( )   PDF (1443KB) ( )   Related Articles | Metrics

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Crack Fault Analysis of the Decelerator Gear Hub of an Engine 2017, 37(2): 158-162.  DOI: 10.3969/j.issn.1006-1355.2017.02.032 Abstract ( )   PDF (1854KB) ( )   Related Articles | Metrics

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Damage Identification of Cables of Long-span Cable-stayed Bridges Using BP-AdaBoost Model under Random Vehicle Load 2017, 37(2): 163-167.  DOI: 10.3969/j.issn.1006-1355.2017.02.033 Abstract ( )   PDF (1294KB) ( )   The cable damage identification method of long-span cable-stayed bridge is proposed using BP-AdaBoost model under random vehicle load in this paper. Firstly,the random traffic load model is established according to the traffic survey data,?and the vibration signal is decomposed using lifting wavelet packet (WP) analysis based on lifting scheme, then the corresponding characteristic vector is established by the energy accumulating variation value of the lifting WP component energy, which can be used to identify damage location of cable of cable-stayed bridge.Finally, the BP-AdaBoost (Back Propagation neural network, the Adaptive Boosting) model is established, combining AdaBoost algorithm and BP neural network to identify the damage degree of the cable of long-span cable-stayed bridge,and the effect of noise on the algorithm is also studied.The numerical results show that the proposed method can be effectively used to identify the cable damage of long-span cable-stayed bridge under random vehicle load. Related Articles | Metrics

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Research on a New Type of Anti-vibration Supports for Hydraulic Pipelines 2017, 37(2): 168-172.  DOI: 10.3969/j.issn.1006-1355.2017.02.034 Abstract ( )   PDF (1301KB) ( )   Related Articles | Metrics

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Simulation and Experimental Research on Dynamics Characteristics of a Novel Dual-chamber Isolator 2017, 37(2): 173-177.  DOI: 10.3969/j.issn.1006-1355.2017.02.035 Abstract ( )   PDF (1416KB) ( )   The dual-chamber Solid and Liquid Mixture (SALiM) isolator is a novel isolator which is designed for vibration isolation of heavy equipment with low frequency. It consists of main chamber, additional chamber, and oil pipe connecting the main chamber and the additional chamber. According to the momentum equation of the fluid in the connected pipe, the nonlinear dynamic model of the vibration isolator was established. The equivalent stiffness and damping expressions are derived by simplifying the nonlinear fluid damping into linear viscous damping when the isolator in excited by harmonic signal. The theoretical and simulation results show that the equivalent stiffness and damping of the system have complex properties. The internal flow of the connected pipe is affected by the fluid damping force and the inertia force of the liquid column. Consequently, the isolator may show stiffness hardening or softening effects under various situations. In this paper, the stiffness and damping characteristics of the isolator are tested by a MTS. A vibration isolation system was established to test the frequency response characteristics of the isolator.The experimental results verify the theoretical and simulation results, which lays the foundation for the following engineering application design. Related Articles | Metrics

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Design and Behavior Analysis of Two-way Pusher-over MRD 2017, 37(2): 178-181.  DOI: 10.3969/j.issn.1006-1355.2017.02.036 Abstract ( )   PDF (1578KB) ( )   Abstract: Based on the rheological properties of MRF, the two-way pusher-over MRD is applied to damping system , this paper discussed the determination of main components parameters and magnetic circuit size in the design of the MRD.We analyze saturation magnetic circuit problem through the Workbench , the result show that magnetic circuit of piston core area and MRF work area are basic saturated at the same time. That confirmed the rationality of the design size and improve the working efficiency. In comparison of the experimental test data and the theoretical data，based on the Bingham model,the result is consistent, and confirmed the feasibility of the design. Related Articles | Metrics

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Research of the Top-down Design Method for Exhaust Mufflers Based on Sound Quality 2017, 37(2): 182-187.  DOI: 10.3969/j.issn.1006-1355.2017.02.037 Abstract ( )   PDF (1803KB) ( )   Related Articles | Metrics

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Application of Reference Model Based Control Strategy in Semi-active Isolation Tests 2017, 37(2): 188-191.  DOI: 10.3969/j.issn.1006-1355.2017.02.038 Abstract ( )   PDF (1465KB) ( )   Related Articles | Metrics

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Comparison and Analysis of Vibration Prediction Models in Environmental Impact Assessment of Urban Rail Transit 2017, 37(2): 192-196.  DOI: 10.3969/j.issn.1006-1355.2017.02.039 Abstract ( )   PDF (1050KB) ( )   Urban rail transit has developed rapidly in recent years, underground lines occupied a considerable proportion of all the lines, accounts for about 70% of the total line length. The main environmental impact of the underground line is environmental vibration, therefore, predict the environmental vibration impact of the running train is the key of underground line environmental impact assessment. This paper systematically compare and analyze the vibration prediction model in the state environmental protection standard—“Technical Guidelines for Environment Impact Assessment of Urban Rail Transit”(HJ453-2008) and the local environmental protection standard of Beijing—“Code for application technique of metro noise and vibration control”(DB11/T 838-2011). Combined with the subway vibration impact in the process of actual operation, analyze the respective advantages and disadvantages of this two vibration prediction model, and putting forward the corresponding opinions and suggestions for the revision work of national standard and Beijing local standard in the future. Related Articles | Metrics

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Active Vibration Control for a Large Annular Flexible Structure Based on Voice Coil Actuators 2017, 37(2): 197-202.  DOI: 10.3969/j.issn.1006-1355.2017.02.040 Abstract ( )   PDF (1882KB) ( )   Related Articles | Metrics

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Vibration Analysis and Control of the Hydraulic Excavator’s Power System 2017, 37(2): 203-206.  DOI: 10.3969/j.issn.1006-1355.2017.02.041 Abstract ( )   PDF (1632KB) ( )   In view of the acute vibration of the excavator pump, the dynamic model of the power system was established using Lagrange's equation. Rigid modal frequency of the power system were obtained. The resonance possibility result from the rigid modal frequency was obviated. Based on finite element method, the effect of the thickness of flange and the distance from the center of pump to flange on the structure modal frequency were analyzed. The key parameter was searched out, and then optimized. The vibration of the pump were tested before and after optimization. The results show that the vibration RMS of the pump reduced by 65.6%, which verifies the correctness of the modeling, analysis and test. Related Articles | Metrics

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Analysis and Improvement of the Excessive Interior Noise and Steering Wheel Vibration of a Passenger Vehicle 2017, 37(2): 207-212.  DOI: 10.3969/j.issn.1006-1355.2017.02.042 Abstract ( )   PDF (1989KB) ( )   Related Articles | Metrics

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Thermal Vibration Analysis of the Antenna of Low Orbit Satellites of the Earth 2017, 37(2): 213-216.  DOI: 10.3969/j.issn.1006-1355.2017.02.043 Abstract ( )   PDF (1266KB) ( )   Due to the frequent shielding of the earth, when the earth's satellite in low orbit, the deployable antenna of the satellite will be in a high and low temperature environment, thus forming a violent change of the temperature field. Severe temperature gradient changes can lead to large flexible deployable antenna, the thermal induced vibration, and reduce the lifetime of the key parts of the whole satellite polarization detection head. This paper builds a physical model of a satellite, and then analyze the space orbit of the transient heat when using the finite element method, the temperature field of deployable antenna, the temperature as constraint is mapped to the structure simulation, and analysis of satellite thermal deformation in the finite element model, realize the prediction of satellite antenna thermal vibration and provide data support. Thermal analysis of the satellite model can monitor the temperature field in each period and predict the possibility of thermal induced vibration, so as to avoid this kind of unfavorable disturbance after the continuous optimization design. Related Articles | Metrics

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Noise Control Analysis of an Air Conditioner Compressor 2017, 37(2): 217-222.  DOI: 10.3969/j.issn.1006-1355.2017.02.044 Abstract ( )   PDF (1356KB) ( )   Related Articles | Metrics