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18 June 2015, Volume 35 Issue 3 Previous Issue    Next Issue

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Study on the Performance of Dynamic Vibration Absorbers of Train Wheels 2015, 35(3): 1-4.  DOI: 10.3969/j.issn.1006-1335.2015.03.001 Abstract ( )   PDF (1708KB) ( )   Related Articles | Metrics

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Study on Damping Characteristics of Low Young’s Modulus Material Using Vibration Beam Testing Method 2015, 35(3): 5-9.  DOI: 10.3969/j.issn.1006-1335.2015.03.002 Abstract ( )   PDF (1295KB) ( )   Related Articles | Metrics

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Experimental Analysis of the Near Field Noise Reduction Performance of Resilient Wheels in Operation State 2015, 35(3): 15-18.  DOI: 10.3969/j.issn.1006-1335.2015.03.004 Abstract ( )   PDF (1685KB) ( )   Related Articles | Metrics

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Operational Modal Analysis of Bogie Frame and Its Effect on Vibration Transfer of High-speed Train 2015, 35(3): 19-23.  DOI: 10.3969/j.issn.1006-1335.2015.03.005 Abstract ( )   PDF (1422KB) ( )   Related Articles | Metrics

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Laboratory Measurement of Damped Rail Decay Rates and Analysis of Noise Reduction 2015, 35(3): 24-28.  DOI: 10.3969/j.issn.1006-1335.2015.03.006 Abstract ( )   PDF (1834KB) ( )   Related Articles | Metrics

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Vibration and Acoustic Characteristics of the Wheels with Doubly Embedded Damping Rings 2015, 35(3): 29-32.  DOI: 10.3969/j.issn.1006-1335.2015.03.007 Abstract ( )   PDF (1375KB) ( )   Related Articles | Metrics

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Sound Radiation Prediction and Control of Section Aluminum of High-speed Train’s Car-body Based on Hybrid FE-SEA Method 2015, 35(3): 33-36.  DOI: 10.3969/j.issn.1006-1335.2015.03.008 Abstract ( )   PDF (1842KB) ( )   Related Articles | Metrics

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Sound Radiation Prediction of Section Aluminum for High-speed Trains Based on MATV Method 2015, 35(3): 37-40.  DOI: 10.3969/j.issn.1006-1335.2015.03.009 Abstract ( )   PDF (1403KB) ( )   Related Articles | Metrics

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Study on the Safety Limit of Rail Corrugation of Metro Lines 2015, 35(3): 41-45.  DOI: 10.3969/j.issn.1006-1335.2015.03.010 Abstract ( )   PDF (1656KB) ( )   Related Articles | Metrics

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Calculation and Verification of Sound Insulation of Foam Aluminum Louver Sound-barrier 2015, 35(3): 46-50.  DOI: 10.3969/j.issn.1006-1335.2015.03.011 Abstract ( )   PDF (1484KB) ( )   Related Articles | Metrics

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Influence of Elastic Material Characteristics on Vibration and Acoustic Radiation of Embedded Tracks 2015, 35(3): 51-55.  DOI: 10.3969/j.issn.1006-1335.2015.03.012 Abstract ( )   PDF (1661KB) ( )   Related Articles | Metrics

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Research on Exterior Aerodynamic Noise Prediction of High-speed Trains Based on Neural Network 2015, 35(3): 56-59.  DOI: 10.3969/j.issn.1006-1335.2015.03.013 Abstract ( )   PDF (1321KB) ( )   Related Articles | Metrics

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Experimental Study on Sound Insulation Performance of Composite Plates of High-speed Trains 2015, 35(3): 60-66.  DOI: 10.3969/j.issn.1006-1335.2015.03.014 Abstract ( )   PDF (1475KB) ( )   Related Articles | Metrics

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Dynamic Model Correction of Car-body Structures of High-speed Trains Based on Experimental Modals 2015, 35(3): 73-77.  DOI: 10.3969/j.issn.1006-1335.2015.03.016 Abstract ( )   PDF (1153KB) ( )   Related Articles | Metrics

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Analysis of Oil Film Boundary Conditions of Tilting Pad Bearing Based on a Geometrical Model 2015, 35(3): 78-81.  DOI: 10.3969/j.issn.1006-1335.2015.03.017 Abstract ( )   PDF (1710KB) ( )   The geometric model of boundary conditions on tilting-pad bearing was studied, the coupling among the shaft axis、each pad center and bearing center was established to solve Reynolds equation and analyze film pressure distribution by using finite difference method. Theoretical derivation indicates that the position of each pad is determined by preset parameters and the location of shaft center. Numerical results show that the bearing capacity increases with eccentricity ratio. A case study demonstrates that when the shaft center is located the angle of displacement and the eccentricity ratio would be determined, thus the results of each pad's equation are determined. One feasible law of the boundary conditions has been established in this paper and provides the theoretical basis for the model of tilting pad bearing. Related Articles | Metrics

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Influence of Sealing Teeth of Thin Cylindrical Shell on its Modal Characteristics 2015, 35(3): 82-86.  DOI: 10.3969/j.issn.1006-1335.2015.03.018 Abstract ( )   PDF (1475KB) ( )   In this paper, the transfer matrix method was presented to study the modal vibration characteristics of a thin cylindrical shell with its circumferential toothing structure on the outer wall (i.e., sealing teeth). Firstly, the dynamic model of thin cylindrical shell with sealing teeth was established based on Love’s shell theory under cantilever boundary condition. Then, the transfer matrix method was introduced for the cylindrical shell to solve its modal characteristics. The natural frequencies and three-dimensional modal shapes of the cylindrical shell were solved by transfer matrix method and high-precise integration method, partly comparing with their corresponding finite element method’s results. At last, the effects of the sealing teeth’s different layouts, heights and numbers on the shell were studied. The results provide a reference for the dynamic research of related structures. The results show that transfer matrix method is suitable for solving the modal vibration characteristics of cantilever thin cylindrical shell with sealing teeth, and sealing teeth’s positions, heights and numbers have great influences on the vibration characteristics of the shell. Related Articles | Metrics

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Vibro-acoustic Characteristic Optimization of Plates Considering Vibro-acoustic Coupling 2015, 35(3): 87-91.  DOI: 10.3969/j.issn.1006-1335.2015.03.019 Abstract ( )   PDF (1136KB) ( )   Related Articles | Metrics

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Modeling and Dynamic Simulation Analysis of Wind Turbine Gearbox Transmission System 2015, 35(3): 92-97.  DOI: 10.3969/j.issn.1006-1335.2015.03.020 Abstract ( )   PDF (1488KB) ( )   Related Articles | Metrics

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Variation Laws of Critical Speeds of a High-speed Flexible Rotor with Different Supporting Stiffness 2015, 35(3): 98-101.  DOI: 10.3969/j.issn.1006-1335.2015.03.021 Abstract ( )   PDF (1069KB) ( )   Related Articles | Metrics

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Dynamic Characteristics of Water Lubricated Bearing-rotor System of a Vertical Water Feed Pump 2015, 35(3): 102-107.  DOI: 10.3969/j.issn.1006-1335.2015.03.022 Abstract ( )   PDF (1904KB) ( )   Related Articles | Metrics

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Finite Element Model Updating of the Rotor Supported by Magnetic Bearings Using Response Surface 2015, 35(3): 108-111.  DOI: 10.3969/j.issn.1006-1335.2015.03.023 Abstract ( )   PDF (1464KB) ( )   Related Articles | Metrics

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Research on Fluid-induced Vibration Characteristics under Coupling Effect of Bearings and Seals 2015, 35(3): 112-116.  DOI: 10.3969/j.issn.1006-1335.2015.03.024 Abstract ( )   PDF (1588KB) ( )   A finite element model was setup to study the influence of the coupling effect of bearings and seals on the system characteristics based on the rotor-bearing-seal system. Finite difference method and CFD method were employed to obtain the dynamic coefficients of bearings and seals. Theoretical studies show that the seal has a large influence on the synchronous response of rotor in the resonant region. The negative preswirl at the inlet tends to improve the system stability. The influence of the seal force on the system stability becomes more and more serious with the increasing rotating speed. Results also show that the detrimental influence of the seal can be compensated by using suitable bearings. Test results show that the subsynchronous vibration appears at about 5000 rpm, and it becomes larger and larger with the increasing rotating speed. The existence of the seal force tends to promote the occurrence of instability faults in bearings and affect the system stability. Related Articles | Metrics

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Study on the Self-excited Oscillation of a Propeller-shaft System under Friction Excitation 2015, 35(3): 117-120.  DOI: 10.3969/j.issn.1006-1335.2015.03.025 Abstract ( )   PDF (1326KB) ( )   Related Articles | Metrics

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Prediction of Turntable Vibration Based on the Frequency Response Functions 2015, 35(3): 121-123.  DOI: 10.3969/j.issn.1006-1335.2015.03.026 Abstract ( )   PDF (1196KB) ( )   Related Articles | Metrics

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Application of SVM and Improved PSO in Structure Noise Optimization for the Road Roller Cab 2015, 35(3): 124-129.  DOI: 10.3969/j.issn.1006-1335.2015.03.027 Abstract ( )   PDF (1384KB) ( )   In view of structure noise for the road roller cab, we combined Latin hypercube experimental design with support vector machine (SVM) approximation model and improved particle swarm optimization (PSO)algorithm together by modifying the parameters of main plates of thickness to reduce cab of the structure noise. The design process that controlled the structure noise based on the SVM and PSO was set. This paper improved the particle swarm due to PSO may lead to local optimal solution and built SVM for high fitting accuracy in place of finite element model by making use of improved PSO to optimize the parameters of SVM. A set of best parameters of thickness that made the reference point (the driver's right ear) sound pressure level minimum were found for we made use of improved PSO to discovery the optimal value of thickness. The process reduced the computing workload and improved the efficiency of optimization. Related Articles | Metrics

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Power Feedback Active Control Algorithm for Vehicle’s Suspensions 2015, 35(3): 130-134.  DOI: 10.3969/j.issn.1006-1335.2015.03.028 Abstract ( )   PDF (1260KB) ( )   Related Articles | Metrics

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Influence of Different Draw-bars on Dynamic Characteristics of a High Speed Flexible Rotor 2015, 35(3): 135-139.  DOI: 10.3969/j.issn.1006-1335.2015.03.029 Abstract ( )   PDF (2186KB) ( )   Related Articles | Metrics

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Field Testing and Analysis of Environment Vibration Induced by Construction of Underground Diaphragm Walls of Subways 2015, 35(3): 140-143.  DOI: 10.3969/j.issn.1006-1335.2015.03.030 Abstract ( )   PDF (1421KB) ( )   Related Articles | Metrics

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Study on Vibration Reduction Characteristics of the CRC Foundation Using Periodic-Fourier Method 2015, 35(3): 144-148.  DOI: 10.3969/j.issn.1006-1335.2015.02.031 Abstract ( )   PDF (1244KB) ( )   Related Articles | Metrics

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Experimental Study on Axial Rub-impact Fault of a High-speed Turbine Generator 2015, 35(3): 149-152.  DOI: 10.3969/j.issn.1006-1335.2015.02.032 Abstract ( )   PDF (1721KB) ( )   Related Articles | Metrics

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An Improved Masking Signal Method and Its Application in Vehicle-bridge Vibration Response Signal Analysis 2015, 35(3): 153-158.  DOI: 10.3969/j.issn.1006-1335.2015.03.033 Abstract ( )   PDF (1943KB) ( )   For the mode mixing problem of the empirical mode decomposition method, a improved masking signal method was proposed by programming the amplitude and frequency determination of the masking signal on the foundation of the masking signal method and validated by two simulation experiments. The results in its application of the vehicle-bridge vibration response signal showed that the unsteady fundamental frequency response signal component was approximately obtained without noise processing and had the ability of positioning intermittent events, providing a new research approach of the vehicle-bridge vibration response signal processing. Related Articles | Metrics

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Extraction of Fault Features for Bearings Based on Morphological Filtering and EMD-AR Spectrum 2015, 35(3): 159-162.  DOI: 10.3969/j.issn.1006-1335.2015.03.034 Abstract ( )   PDF (1522KB) ( )   Related Articles | Metrics

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Damage Localization Imaging of Train’s Bogie Frames Based on Ultrasonic Guided Wave 2015, 35(3): 163-168.  DOI: 10.3969/j.issn.1006-1335.2015.03.035 Abstract ( )   PDF (1530KB) ( )   Related Articles | Metrics

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Characteristic Frequency Calculation and Analysis of Deep Groove Ball Bearings 2015, 35(3): 169-172.  DOI: 10.3969/j.issn.1006-1335.2015.03.036 Abstract ( )   PDF (1515KB) ( )   Related Articles | Metrics

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Application of CICA in compound fault feature extracting of rolling bearings 2015, 35(3): 173-176.  Abstract ( )   PDF (1344KB) ( )   In order to extract fault features of compound signals, a method based on discrete wavelet transform (DWT) and constrained independent component analysis (CICA) was proposed in this paper. With the approach, the single channel vibration signal was firstly decomposed into several wavelet coefficients by DWT method. Secondly, the reference signal of CICA algorithm was established based on prior knowledge of source signals. Thirdly, envelope signals of the reconstructed wavelet coefficients were selected as the input matrix of CICA algorithm. Experimental results validate the effectiveness of the proposed method in compound fault separating, which works not only for the outer race defect, but also for the rollers defect. Related Articles | Metrics

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Vibration Characteristics and Diagnosis of the Impact-rubbing Fault between Rotor and Seal for a Centrifugal Compressor 2015, 35(3): 177-180.  DOI: 10.3969/j.issn.1006-1335.2015.03.038 Abstract ( )   PDF (1136KB) ( )   Abstract: During the trial operation stage of a centrifugal compressor, the shaft vibration always begin to climb from about 20 minutes after the unit is running at the working speed. Finally, the unit has to be shut down, due to the higher vibration. In order to eliminate the unit fault, the shaft vibration at starting process and working speed is measured. According to the changing trend and the characteristics of time domain and frequency spectrum of shaft vibration at different rotating speed and different time, fault is considered as rubbing between rotor and seal. In order to validate the fault reason, the diaphragm seal and impeller seal are removed and the rubbing between rotor and seal is avoided, the unit runs well in this state, this process shows that the fault reason is correct. After the seal gap is adjusted, the vibration fault of the unit disappeared. Related Articles | Metrics

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Sound Transmission Analysis of Sandwich Plates Based on Spectral Element Method 2015, 35(3): 181-185.  DOI: 10.3969/j.issn.1006-1335.2015.03.039 Abstract ( )   PDF (1151KB) ( )   A theoretical study on the vibration response of sandwich plates with typical corrugated cores under incident plane sound wave is presented by using spectral element method (SEM). Accuracy and efficiency of the SEM are validated by comparing the results with FEM. The transmitted sound power through the sandwich plates under normal incident plane sound wave is calculated by applying Rayleigh integral. The effects of the distance between two faceplates and the inclined angle of stiffening core on the transmitted acoustic power are studied under the constraint condition of constant cross section area of the whole structure. It is shown that the radiated sound power by the transmitting plate decreases as the inclined angle of corrugated core increases. When the inclined angle of the core is varying from zero to 22o, the transmitted sound power becomes less with the decreased height between the two faceplates. These results are meaningful to the structural design and vibro-acoustic optimization of sandwich plates with corrugated cores. Related Articles | Metrics

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Dynamic Analysis of Multi-layered Isolation System Subjected to Underwater Explosion 2015, 35(3): 186-188.  DOI: 10.3969/j.issn.1006-1335.2015.03.040 Abstract ( )   PDF (1115KB) ( )   Related Articles | Metrics

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Optimization of Dynamic Absorbers of Tunnel Boring Machines 2015, 35(3): 189-194.  DOI: 10.3969/j.issn.1006-1335.2015.03.041 Abstract ( )   PDF (1373KB) ( )   Vibration measurements of the thrust system of a Tunnel Boring Machine (TBM) are conducted at the construction site. The measurement results show the intensive vibration of the TBM during the tunnel boring process and that there is a distinct peak about 15 Hz. In order to suppress the vibration of TBM, a measure using dynamic vibration absorber (DVA) is considered. However, to ensure the vibration reduction effectiveness of the DVA, its mass is required to be large enough according to the principle of the traditional DVA design. Due to the tremendous mass of TBM and the limited available space for DVA installation, the mass of DVA is limited within a small range. In this work, new DVA with the application of the principle of the leverage is therefore proposed to implement the mass amplification effect. The dynamics equation for describing the motion of the considered mechanical system with this new DVA is developed, and the frequency response function is obtained. Furthermore, the stiffness and damping parameters of the proposed DVA are optimized using fixed-point design theory. Finally, the performance of the new DVA and the traditional DVA are compared, showing that the new DVA is performed much better than the traditional ones in terms of the vibration reduction of the trust system. Related Articles | Metrics

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Experimental Investigation on the Influence of Bearing Supply Pressure on Gas Whip of the Rotor-Bearing Systems of High Speed Turbines 2015, 35(3): 195-199.  DOI: 10.3969/j.issn.1006-1335.2015.03.042 Abstract ( )   PDF (1797KB) ( )   Related Articles | Metrics

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Application of Noise Technique to Aero Engines 2015, 35(3): 200-203.  DOI: 10.3969/j.issn.1006-1335.2015.03.043 Abstract ( )   PDF (1901KB) ( )   Related Articles | Metrics

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Rubbing Characteristic Test Based on an Aeroengine Rotor-stator Testing Rig 2015, 35(3): 204-207.  DOI: 10.3969/j.issn.1006-1335.2015.03.044 Abstract ( )   PDF (1367KB) ( )   Based on aeroengine rotor-stator experimental rig, the rubbing characteristic in different casing position was experimentally studied in this research. When rub-impact happened, acceleration response signals were measured, and the corresponding time domain signals and frequency spectrums were compared with the ones measured under non-rubbing state. Finally, impact and amplitude modulation characteristics were observed in the actual test where rubbing signals between aeroengine blisk rotor and casing were effectively acquired. The tested results proved that there were some sidebands in the vicinity of rubbing frequency and its nth-harmonic frequencies (where n represents an integer). Besides, in the low frequency range, the rubbing was characterized by the rotation frequency and its harmonic components，and usually these components were more obvious than the former. Related Articles | Metrics

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Cause Analysis of Pipeline Vibration in Nuclear Power Plants and Its Improvement Strategies 2015, 35(3): 208-210.  DOI: 10.3969/j.issn.1006-1335.2015.03.045 Abstract ( )   PDF (799KB) ( )   Piping is one of key equipment in nuclear power plant. Vibration usually happens to the piping. The vibration can induce the piping to crack or rupture. Serious crack will forces the power plant to shut down and maintenance. Sometimes may cause catastrophic accidents, some of which have been listed in the paper. In order to reduce such kind of accidents, the main reasons inducing the vibration of the piping in nuclear power plant have been analyzed, such as the vibration of the rotating equipment, hydraulic hammer action, fluid pulsation, cavitations corrosion, gas liquid two-phase flow, wind, earthquake and artificial error. Moreover, the accident case and common improvement scheme have been put forward. The work of this paper can provides necessary references for the piping design, construction, maintenance and overhaul, in nuclear power plant. Related Articles | Metrics