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18 April 2016, Volume 36 Issue 2 Previous Issue    Next Issue

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Study on the Band-gap of Periodic Structures in the Viewpoint of Power Efficiency 2016, 36(2): 1-5.  DOI: 10.3969/j.issn.1006-1335.2016.02.001 Abstract ( )   PDF (1198KB) ( )   Related Articles | Metrics

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Overview of the Research of Automobile Energy Recovery Systems 2016, 36(2): 6-11.  DOI: 10.3969/j.issn.1006-1335.2016.02.002 Abstract ( )   PDF (866KB) ( )   Under the trend of automobile energy saving development, the vehicle energy recovery system has become more and more attractive to many automobile researchers and engineers. Recently, the research hotspots of automobile energy recovery system mainly focus on regenerative braking, regenerative suspension and waste energy recovery of engine these three aspects. Above all, the features and the current development of automobile energy recovery systems are explicitly reviewed. Then the advantages and key problems of every energy recovery system are stated. In the end, the corresponding solution suggestions are proposed and the new ways of energy recovery are explored ,which will provide the reference for the further research. Related Articles | Metrics

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Research of Vibration Characteristics of Periodic Truss Structures in Satellites 2016, 36(2): 12-16.  DOI: 10.3969/j.issn.1006-1335.2016.02.003 Abstract ( )   PDF (1723KB) ( )   Abstract: the analytic result of periodic truss structures is deduced by Spectrum Element Method, and validated by FEM. This thesis research and prove the vibration transfer characteristics of periodic truss structures, such as periodic structure band gap and waveform conversion mechanism. On the basis of this research results, establish the simple periodic truss modal of satellite structure，analysis the dynamic transfer trait with SEM and experiment. The simulation and experiment results show that the periodic truss structure has better vibration isolation properties. Especially, the vibration debased greatly in pass band. So the periodic truss has a great application foreground in satellite structure design. Related Articles | Metrics

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Simulation and Experimental Study on the Dynamic Characteristics of the Holmes Duffing System 2016, 36(2): 17-21.  DOI: 10.3969/j.issn.1006-1335.2016.02.004 Abstract ( )   PDF (1469KB) ( )   Aiming at the deficiency of repeatable chaotic vibration experiments in chaotic study, a chaotic vibration experiment platform is designed and researched. The model of approximate particle motion in double potential wellis established and its dynamic characteristics is analyzed. As a result, the periodic solutions and chaotic solutions are observed. In experimental study, parameter interval of the chaos is determined.In addition, such phenomena as the sensitivity of initial value, Symmetry breaking bifurcation and period doubling bifurcation are all observed in Duffing system. Related Articles | Metrics

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Stability Analysis of Ball-type Automatic Balancer Devices with Non-plane Motion 2016, 36(2): 21-26.  DOI: 10.3969/j.issn.1006-1335.2016.02.005 Abstract ( )   PDF (1401KB) ( )   In the actual production, as imbalance moment was acting on high-speed rotor, the whole shaft produced a space motion, which led to non-plane motion of the rotor. By using the Lagrange equation and Newton’s law, a mathematical model of ball-type automatic balancers device with non-plane motion had been established. In order to analyze the possible solution of the mathematical model which would make the system stable , perturbation method and Rolls - Hurwitz criterion had been adopted. After this kind of analysis, there is solution which can make the system stable when the automatic balancers device is at the situation of one ball or two balls. And the vibration of system under different condition can be obtained. The device has solutions which can make the system stable at critical speed, and it can also counterpoise unbalanced force under certain conditions, in order to achieve the purpose of vibration. Related Articles | Metrics

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Study on Mobility Parametric Modeling of Irregular Structures 2016, 36(2): 27-30.  DOI: 10.3969/j.issn.1006-1335.2016.02.006 Abstract ( )   PDF (1392KB) ( )   Complex structures are made of a variety of irregular sub-structures, and the vibration characteristic is obtained by dynamics test and simulation analysis. In order to quickly obtain the vibration response of complex structures, guiding acoustic design of structure, often needs to carry out parametric modeling of sub-structures. Mobility reflecting structural vibration response characteristics and using mobility as the basic parameters, a rectangular hollow beam is used to build seawater pump’s equivalent model in this paper. Finally, combining test results, the accuracy and applicability of parametric model are verified by changing the actuated position and material parameters. Related Articles | Metrics

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Modeling for an Elastic Double-stage Vibration Isolation System with Nonlinear Shock Absorbers 2016, 36(2): 31-34.  DOI: 10.3969/j.issn.1006-1335.2016.02.007 Abstract ( )   PDF (1020KB) ( )   Related Articles | Metrics

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Design of Multi-grade Parallel Dynamic Vibration Absorbers on an Elastic Foundation 2016, 36(2): 35-39.  DOI: 10.3969/j.issn.1006-1335.2016.02.008 Abstract ( )   PDF (1468KB) ( )   Related Articles | Metrics

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Stability Analysis of Spline Connected Rotor System 2016, 36(2): 40-45.  DOI: 10.3969/j.issn.1006-1335.2016.02.009 Abstract ( )   PDF (1951KB) ( )   Involute spline couplings are widely used in aircraft to transmit power from turbine end to the output components, generators and other engine accessories. The study aims at obtaining the instability principle of spline connected rotor system due to the spline coupling. In this paper, spline force is described as equivalent stiffness coefficients and damping coefficients. The model of spline connected rotor system has been established with finite element analysis method. The effect of spline force on the stability of the rotor system has been studied with eigenvalue method. What is more, the impact of the friction coefficient, load torque and outer damping on the system stability are discussed. The results show that the increase of friction coefficient, load torque can decrease the stability of the rotor system. In the contrary, the out damping can increase the stability of the spline connected rotor system. Related Articles | Metrics

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Analysis of Nonlinear Vibration Characteristics of the Hollow Cracked Rotor Shaft of a Large-scale Elliptical Oscillating Sieve 2016, 36(2): 46-51.  DOI: 10.3969/j.issn.1006-1335.2016.02.010 Abstract ( )   PDF (1551KB) ( )   Related Articles | Metrics

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Influence of Tooth Width and Helical Angle on Dynamic Characteristics of Herringbone Planetary Gears 2016, 36(2): 52-55.  DOI: 10.3969/j.issn.1006-1335.2016.02.011 Abstract ( )   PDF (1541KB) ( )   Related Articles | Metrics

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Optimization Design of Flywheel Structural Parameters    Based on Finite Element Analysis and MIGA Method 2016, 36(2): 56-60.  DOI: 10.3969/j.issn.1006-1335.2016.02.012 Abstract ( )   PDF (1726KB) ( )   Related Articles | Metrics

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Finite Element Simulation of Human Ears 2016, 36(2): 61-64.  DOI: 10.3969/j.issn.1006-1335.2016.02.013 Abstract ( )   PDF (1363KB) ( )   Related Articles | Metrics

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Fault Dynamic Simulation and Feature Extraction of a Planetary Gear Transmission System 2016, 36(2): 65-68.  DOI: 10.3969/j.issn.1006-1335.2016.02.014 Abstract ( )   PDF (1628KB) ( )   Widely though planetary transmission has been applied, it breaks down often so that a diagnosis and prediction mechanism is needed for this issue. In this paper, a flex-rigid coupled marine planetary reducer model is established to simulate different function faults. The fault information extracted from the model tells that fault gathers energy around the main peak and results in sideband shift. Different fault has a different modulation, which guides the operation of planetary transmission. Related Articles | Metrics

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Whole Aero-engine Structure Analysis and Its Application in Engine Design 2016, 36(2): 69-75.  DOI: 10.3969/j.issn.1006-1335.2016.02.015 Abstract ( )   PDF (1770KB) ( )   Whole Aero-Engine structure analysis (WAESA) plays an important role in engine design and manufacturing, from concept design phase to delivery. This paper first introduced the concept of WAESA and its development both in industry and institutes. During the engine design, WAESA faces the challenges from the aspects such as model size, model quality and computational efficiency. Therefore a series of technical researches need to be carried out for model simplification, mixed meshing, model updating and validation, connection structure modeling and development of integrated platform. At last with engineering practices, the applications of WAESA in load output, tip clearance control and vibration assessment were shared. Related Articles | Metrics

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Shock Characteristics of a Three-reel Parallel-type Marine Winch 2016, 36(2): 76-79.  DOI: 10.3969/j.issn.1006-1335.2016.02.016 Abstract ( )   PDF (1441KB) ( )   The shock characteristics of winch is studied with the finite element software of ANSYS. Acceleration and stress response of the winch in three directions of transverse, longitudinal, vertical under shock load is analyzed. The response characteristics of the six motor at different loads is summarized, and the anti-shock characteristics of the winch is simply optimized. Related Articles | Metrics

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Time-domain Analysis of Shock Resistance Ability of  Retractable Equipment of Towed Sonars 2016, 36(2): 80-83.  DOI: 10.3969/j.issn.1006-1335.2016.02.017 Abstract ( )   PDF (1339KB) ( )   Related Articles | Metrics

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Analysis and Comparison of Constraint Modal and Operation Modal of a Car Roof 2016, 36(2): 84-87.  DOI: 10.3969/j.issn.1006-1335.2016.02.018 Abstract ( )   PDF (1550KB) ( )   Make experiments to achieve constraint modal and operation modal of a car roof. In the constraint modal experiment the car is impacted by a vibration exciter while in the operation modal experiment impacted by a hub in the anechoic chamber. By the comparison with auto power spectrum of driver noise, operation modal analysis is proved to be more precise. By the comparison between auto power spectrum of driver noise and the average of auto power spectrum of all outputs vibration, roof vibration is proved to be the main cause of driver noise between 100Hz and 400Hz. At last, by the means of adjusting roof structure, driver noise is restrained. Related Articles | Metrics

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Time-domain CFD Analysis of Acoustic Attenuation Performance of Hybrid Expansion Chamber Silencers 2016, 36(2): 88-91.  DOI: 10.3969/j.issn.1006-1335.2016.02.019 Abstract ( )   PDF (1295KB) ( )   The three-dimensional time-domain CFD approach is used to compute the acoustic attenuation performance of hybrid expansion chamber silencers. Firstly, the calculation principle and procedure of the three-dimensional time-domain CFD method is introduced. And then, the transmission loss of hybrid expansion chamber silencers is predicted by this method, and good agreements between the time-domain approach results and measurements and finite element method (FEM) results are observed. The numerical results demonstrated that the resistivity has an obvious influence on the acoustic attenuation performance of hybrid expansion chamber silencers. Related Articles | Metrics

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Design of Abnormal Noise Identifying System for Suspension Shock Absorbers 2016, 36(2): 92-96.  DOI: 10.3969/j.issn.1006-1335.2016.02.020 Abstract ( )   PDF (1449KB) ( )   For a vehicle suspension shock absorber abnormal noise problem, the vehicle road test and rig test has been carried on. By collecting a large amount of data and integrating previous research results, a method of clustering analysis based on weight coefficient has been processed for identifying abnormal noise of suspension shock absorber and analyzed the principle in this system. Moreover, based on the virtual instrument development system LabVIEW and the toolbox of signal processing in MATLAB, a test system for identifying abnormal noise of suspension shock absorber was developed and applied it to the shock absorber. The test result shows that the correlation coefficient between the outcome of identification and the subjective evaluation in road test is higher than 0.92, which can meet the standards of most factories in product quality control requirements, and provide reference for sample test, improve identification reliability and production process modification. Related Articles | Metrics

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Study on Shock Isolation Performance of Mechanical and Electrical Control Equipment of Warships 2016, 36(2): 101-103.  DOI: 10.3969/j.issn.1006-1335.2016.02.022 Abstract ( )   PDF (1368KB) ( )   One degree of free (1 DOF) shock isolation system is established to model the mechanical and electrical control equipments on warship, and shock isolation performance of the 1 DOF system are evaluated by the parameter of the respond acceleration. The analysis results can future provides references for designing shock isolator. Then, finite element model of control equipment is established in ANSYS and solved in LS-DYNA by using of explicit dynamic method, and numerical results for the isolation performances of the equipment are discussed in detail. Finally, shock test scheme of control cabinet is established for measuring shock acceleration response. Related Articles | Metrics

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Transfer Path Analysis under Loading Conditions 2016, 36(2): 104-107.  DOI: 10.3969/j.issn.1006-1335.2016.02.023 Abstract ( )   PDF (1461KB) ( )   Related Articles | Metrics

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Determination of Contribution Panels of Vehicle’s Interior Noise Using NTF, ODS and PFP 2016, 36(2): 108-111.  DOI: 10.3969/j.issn.1006-1335.2016.02.024 Abstract ( )   PDF (1683KB) ( )   Related Articles | Metrics

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Optimal Design and Vibration Isolation Test Evaluation for a Domestic SUV Mount System 2016, 36(2): 112-115.  DOI: 10.3969/j.issn.1006-1335.2016.02.025 Abstract ( )   PDF (1355KB) ( )   Related Articles | Metrics

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Objective Parameters Analysis of Sound Quality of Auto Horizontal Driving Machines 2016, 36(2): 116-120.  DOI: 10.3969/j.issn.1006-1335.2016.02.026 Abstract ( )   PDF (1734KB) ( )   Related Articles | Metrics

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Analysis and Improvement of Interior Low Frequency Noise in a Special Vehicle 2016, 36(2): 121-125.  DOI: 10.3969/j.issn.1006-1335.2016.02.027 Abstract ( )   PDF (1856KB) ( )   Related Articles | Metrics

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Distribution Law of the Internal Noise in Metro Cars 2016, 36(2): 126-129.  DOI: 10.3969/j.issn.1006-1335.2016.02.028 Abstract ( )   PDF (1392KB) ( )   Related Articles | Metrics

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Analysis and Application of Transfer Characteristics of Power System Mounts 2016, 36(2): 130-134.  DOI: 10.3969/j.issn.1006-1335.2016.02.029 Abstract ( )   PDF (1691KB) ( )   The vibration from different moving structure in car traveling is interactional, judging interactional relations among structures reasonably is premise to analyze the suspension system characteristics. In paper, the transfer characteristics law with the acceleration being exciting are analyzed and summarized, the mount transfer characteristic of the car in driving is derived, and combining with experiment, calculation flow of the mount isolation characteristic is designed, experiments with independent power system excitation test, independent road excitation test, driving test in steady speed are proposed to obtain interference components, common frequency components and the corresponding proportion between vibration source; and finally, by the actual driving testing and data processing, the time-domain isolation characteristics of the power system mounts are obtained. The proposed method can effectively improve the evaluation precision of the mount system and transfer characteristics it is a certain engineering application value. Related Articles | Metrics

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Analysis of Free Vibration of Marine Propulsion Shafting System with Nonlinear Components 2016, 36(2): 135-138.  DOI: 10.3969/j.issn.1006-1335.2016.02.030 Abstract ( )   PDF (1214KB) ( )   Abstract: Through the analysis of the characteristics of the torsional vibration mathematical model of the nonlinear element，nonlinear torsional vibration of a single quality equation is established. It is derived more freedom torsional vibration system of nonlinear equations common. Harmonic balance method is used to solve the multi - freedom nonlinear vibration equation. In order to solve the nonlinear vibration system of multi degree of freedom，the method provides theoretical guidance and reference. Related Articles | Metrics

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Effect of Excitation on Vibration Transmission Characteristics of Mechanical Equipment on Flexible Structures 2016, 36(2): 139-143.  DOI: 10.3969/j.issn.1006-1335.2016.02.031 Abstract ( )   PDF (1260KB) ( )   It is important for devices and equipments on board to isolate the vibration from base structure because of the dependency of accuracy and lifespan on vibration. The excitation comes from base structure directly for the devices, so a dynamic system that consists of a flexible base, vibration isolators and a rigid body is considered in this paper. Based on sub-structures method and the concept of admittance, the model of the dynamic system is constructed, and the expression of transmitted vibration from base to equipment is deduced. The effects of frequency and allocation on vibration are analyzed by simulation and tests. The result shows that the transverse resonance of the beam is the main reason of the high vibration transmissibility; the nonsymmetrical excitation can arouse more bending resonant modes of the foundation architecture; excitation with higher frequency will cause longitudinal and bend vibration of the vibration isolator that result in standing wave effect; the expressions given can reflect the vibration transmissibility accurately at the range of 100-1000Hz. Related Articles | Metrics

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Effect of Negative Wave Induced by Underwater Non-contact Explosion on Ship Devices’ Damage 2016, 36(2): 144-147.  DOI: 10.3969/j.issn.1006-1335.2016.02.032 Abstract ( )   PDF (1536KB) ( )   Related Articles | Metrics

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Analysis of Influence of the Rotation Direction on Aerodynamic Noise of a Vehicle Alternator 2016, 36(2): 148-152.  DOI: 10.3969/j.issn.1006-1335.2016.02.033 Abstract ( )   PDF (1994KB) ( )   For the problems that complexity of sound source about aerodynamic noise, and different direction of rotation of the alternator aerodynamic noise impact, this paper is based on Lighthill acoustic analogue theory, broadband noise source model, large eddy simulation method and FW-H acoustic model are adopted to simulate the aerodynamic noise for vehicle alternator. The results show that the numerical predictions of main alternator noise orders and their magnitudes obtained by LES are in good consistency with experimental results. The front and rear blades are the main aerodynamic noise sources for this type of alternator. The main components of aerodynamic noise are the 6, 8, 10, 12 and 18th orders and the acoustic pressure level within 1/3 octave band frequency ranges from 1120Hz to 5600Hz. Overall sound pressure level (OASPL) of operating point in the opposite direction of the alternator is 9.17dB higher than that in the positive direction of operation, and the mass flow rate in the opposite direction of the alternator is 62.87g/s lower than that in the positive direction of operation. This research can provide practical reference for the improvement of performance of aerodynamics noise for vehicle alternator. Related Articles | Metrics

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Multi-index Evaluation Metrics System of Aircraft Noise in Military Airports 2016, 36(2): 153-157.  DOI: 10.3969/j.issn.1006-1335.2016.02.034 Abstract ( )   PDF (1023KB) ( )   The special characteristics of military airport noise which include large range of noise influence, prominent effect of single fly event noise and inhomogeneity of noise impact are analyzed. Then the inadequacy of existing noise evaluation is pointed out. According to the above analysis， multi-index metrics system in military airport noise evaluation which consist of Ldn、LAmaxand rush hour RLdnis proposed. The paper analyses the rationality of the system and puts forward the limited standard. Through three military airports noise measurement and investigation on noise subjective response, the feasibility of the system is verified Related Articles | Metrics

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Simulation and Analysis of Aerodynamic Noise of a Large Wind Turbine 2016, 36(2): 158-161.  DOI: 10.3969/j.issn.1006-1335.2016.02.035 Abstract ( )   PDF (1571KB) ( )   The wind turbine with 2MW power was regarded as research object. The three-dimensional model was established by Pro/E. The flow field and sound field of the turbine was simulated by Fluent. The intensity of vortex and streamlines information was obtained while the unsteady flows within the flow field of wind turbine were solved by the Large Eddy Simulation(LES). At last, the aerodynamic noise was calculated by F-WH acoustic model. The results show that the vortex intensity and sound pressure pulsation gradually strengthen from the root to the tip, and reach maximum at the tip of turbine. The tip region is the main source of noise. The leeward of rotor have the stronger vortex intensity and sound pressure pulsation than windward. It cause synthetic sound power level of leeward was higher than that of windward, while the leeward and windward of rotor are the same distance from the wind turbine. Tower-shadow effect is an important part of the aerodynamic noise, and the aerodynamic noise is mainly middle and low frequency noise. Related Articles | Metrics

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Dynamic Response Analysis of Noise Barrier  Structures under Impulsive Wind Load 2016, 36(2): 162-165.  DOI: 10.3969/j.issn.1006-1335.2016.02.036 Abstract ( )   PDF (1333KB) ( )   Related Articles | Metrics

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Structural Seismic Response Control Based on SMA Neural Network Constitutive Model 2016, 36(2): 166-171.  DOI: 10.3969/j.issn.1006-1335.2016.02.037 Abstract ( )   PDF (2281KB) ( )   Related Articles | Metrics

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Beam Displacement Control of Continuous Girder Bridge Installed with Rubber Bearings 2016, 36(2): 172-175.  DOI: 10.3969/j.issn.1006-1335.2016.02.038 Abstract ( )   PDF (1409KB) ( )   To improve the seismic performance of continuous girder bridge installed with rubber bearings, additional fluid viscous dampers are suggested in this paper, and the analysis of structural seismic response and damping property is made by complex mode and approximate real mode method. The results indicate that supplemental fluid viscous damper causes obvious beam displacement reduction and non-classical problem, but the former shows little influence caused by the latter. The position of such dampers show significant influence on structural damping level, and the installation on multi-piers superior to single-pier for beam displacement control. Related Articles | Metrics

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Inter-channel Crosstalk Algorithm in Multichannel Active Vibration Isolation 2016, 36(2): 176-179.  DOI: 10.3969/j.issn.1006-1335.2016.02.039 Abstract ( )   PDF (1625KB) ( )   The multi-channel active vibration isolation is to use coordination control method through multiple actuators to suppress the global system vibration. While an actuator is controlling vibration, it also interferes in other actuators, so inter-channels crosstalk is a big problem in the multi-channel active control. In this paper decoupling filters are applied to suppress inter-channels crosstalk in multi-channel active vibration. Decoupling filters are used to filter out inter-channel crosstalk signal in control error signal so that the new signal can replace control error signal as the new reference signal of the Filter-xLMS algorithm. Simulation shows that using the decoupling filter has important influence on the result of the multi-channel active control, the decoupling filter still guarantee the convergence of the algorithm when the inter-channels is positive feedback, and prevent the deterioration of control effect. Related Articles | Metrics

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Fault Diagnosis Method of Bearings Based on CGHMM Initialization by Genetic Algorithm 2016, 36(2): 180-184.  DOI: 10.3969/j.issn.1006-1335.2016.02.040 Abstract ( )   PDF (1393KB) ( )   CGHMM have been widely used in fault diagnosis and have achieved some success. However, there are some inherent disadvantages in traditional CGHMM, such as the Model complexity and the local optimization, leading the Iterative convergence speed and model effect to be influenced by Initialization of CGHMM parameter. Therefore, a good initial value for CGHMM training is provided by CGHMM model parameters which are initialized by genetic algorithm, which not only can accelerate the convergence speed, but also can get a better effect. Through the three aspects of the simulation experiment of CGHMM initialized by genetic algorithm, the CGHMM training process and the CGHMM diagnosis process, the method of this paper have the advantages of fast training speed and better CGHMM model. At last, the CGHMM diagnosis result demonstrates that the diagnosis precision achieve to 100% in this paper, which is higher than that of the classical method achieving to 96%. This result shows that the genetic algorithm can be applied to CGHMM parameter initialization and the proposed method is a feasible method of fault diagnosis. Related Articles | Metrics

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Analysis of Microseismic Signal Characteristics of Rock Burst in the “Three-Hard” Featured Coal Seam 2016, 36(2): 185-188.  DOI: 10.3969/j.issn.1006-1335.2016.02.041 Abstract ( )   PDF (1562KB) ( )   For researching working face micro-seismic activity law of "three hard" coal seam, the paper took Xinzhou coal mine micro-seismic monitoring system as an example. With the intensive study of seismic source distribution features , relationship between seismic energy, frequency and miningand micro-seismic signal characteristic analysis of typical rock-burst, the general ruleof working face seismic activities has been revealed especially revealed seismic effects of rock-burst precursors. The study provides the basis for setting up micro-seismic prediction technology of "three hard" coal seam rock-burst and evaluating rock-burst. And it had great theoretical significance and practical value. Related Articles | Metrics

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Mechanical Property Tests of NiTi Wires with Different Diameters Used for Dampers 2016, 36(2): 189-193.  DOI: 10.3969/j.issn.1006-1335.2016.02.042 Abstract ( )   PDF (1769KB) ( )   Cyclic loading tests of SMA wires with different diameters were conducted in various conditions, and the influence of cyclic number, strain amplitude and loading frequency on equivalent stiffness, energy dissipation per cycle, and damping properties was investigated in this paper. The results show that the mechanical behavior of SMA wires manifests a good repeatability after entering into a stable period through numerous cycles. For the SMA wires with the same diameter, the equivalent stiffness, energy dissipation per cycle, and damping properties decrease with the increase of cyclic times; the equivalent stiffness decrease while the energy-absorbed increase linearly with the strain amplitude increase. All of these have an introductive significance in developing damping elements. Related Articles | Metrics

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Vibration Control of an Electrorheological Sandwich Plate Using Sliding Control Method 2016, 36(2): 194-198.  DOI: 10.3969/j.issn.1006-1335.2016.02.043 Abstract ( )   PDF (1233KB) ( )   Related Articles | Metrics

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Load Characteristic Test of a High Speed Turbine Generator 2016, 36(2): 199-204.  DOI: 10.3969/j.issn.1006-1335.2016.02.044 Abstract ( )   PDF (2142KB) ( )   Related Articles | Metrics

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Analysis of Shock Characteristics and Failure Law for Low-frequency Reed Gage 2016, 36(2): 205-208.  DOI: 10.3969/j.issn.1006-1335.2016.02.045 Abstract ( )   PDF (1195KB) ( )   Low-frequency reed gage is the main apparatus of the low-frequency shock spectrum, the structure of it has a cantilever beam with a lumped-mass and a different natural frequency. When the ship shocked about by the explosion, centralized quality cantilever beam prones to plastic deformation or fracture then has a direct impact on the measurement results. In order to analyze the anti-shock function of the centralized quality cantilever , By using the modal superposition method established a theory model that the centralized quality cantilever beam was undergoing impact load, analysis its dynamic response and failure law. The results show that the higher natural frequency of the cantilever and the peak stress, the more prone to plastic deformation or fracture. For the centralized quality cantilever beam, the damage capability of the load capacity only related to the limit displacement spectrum. The greater the displacement ,the greater the destructive capability. Negative wave retarder has a certain influence on the destructive potential of the concentrated mass cantilever beam. When increase the limit spectrum displacement we can consider the influence of it in the design of conventional shock. Related Articles | Metrics

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Application of Equivalent Parameters of Joints in Vibration Control of a Reciprocating Compressor Pipeline 2016, 36(2): 209-215.  DOI: 10.3969/j.issn.1006-1335.2016.02.046 Abstract ( )   PDF (1570KB) ( )   In order to solve the problem of vibration in large reciprocating compressor unit and pipeline, the effective of numerical calculation model is set up.A method of using equivalent parameters in joints to modify finite element model was proposed．With it，the pipeline vibration characteristic analysis method based on finite element was combined with the dynamic modification technology based on equivalent parameter. Restore the real vibration model about engineering field through handling the joint part of pipeline and accessories as elastic constraint and calculating the best equivalent stiffness，identified the reasons of the pipeline vibration based on modal analysis of the real model combine with the field measured data. Then using the technology about equivalent parameter identification to putting forward retrofit scheme，the pipeline avoided resonance frequency after transforming and vibration amplitude was down to 95.4%. The introduction of the method to establish the effective of the numerical model for field engineering has important guiding significance. Related Articles | Metrics