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18 June 2017, Volume 37 Issue 3 Previous Issue    Next Issue

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An Improved Substructure Synthesis Method Based on the Identification of Joint Characteristics 2017, 37(3): 1-7.  DOI: 10.3969/j.issn.1006-1355.2017.03.001 Abstract ( )   PDF (1780KB) ( )   Related Articles | Metrics

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7-DOF Modelling and Testing of Seating Human Bodies for Prediction of Responses to Large Magnitude Vertical Vibration at High Frequencies 2017, 37(3): 8-13.  DOI: 10.3969/j.issn.1006-1355.2017.03.002 Abstract ( )   PDF (1700KB) ( )   In order to control the interior vibration of buildings and vehicles, a proper model of human body need to be developed to predict the dynamic response of the human body under different conditions. So far, most of the previous studies concerned on the biodynamic responses to vibration at relatively low frequencies (<20Hz) and small magnitudes (<1.5ms-2), which may not predict the human responses to vibration at relatively high frequencies (>20Hz) and large magnitudes (>1.5ms-2) well. The present study proposed a modified 7 degrees-of-freedom (DOF) model to predict the biodynamic response of the seated human body to the vertical vibration at relatively high frequencies and large magnitudes. An experiment was conducted to measure the apparent mass of the seated human body on 25 subjects (13 males and 12 females) with random vertical vibration at 2-100Hz and four different magnitudes (1.0、1.5、2.0、2.5m/s2). The experimental data were compared with the predicted data to identify the parameters of the 7 DOF model. The results showed that the modified 7 DOF model predicted the dynamic response of seated human body more accurately than the 3 DOF model in the international standard to the vertical vibration at frequencies higher than 20Hz and magnitudes larger than 1.0m/s2. Related Articles | Metrics

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Discussion on the Relation between Correlation Functions and Impulse Response Functions under Ambient Excitation 2017, 37(3): 14-18.  DOI: 10.3969/j.issn.1006-1355.2017.03.003 Abstract ( )   PDF (1201KB) ( )   The impulse response functions (IRFs) contain all the dynamic characteristics of a structure. The extraction of IRFs or frequency response functions (FRF) is the premise of obtaining the dynamic characteristics of the structure, the structure identification, the health monitoring, and the precise control of the structure. However, in some real in-operation working conditions, the excitations cannot be measured. Thus the IRFs cannot be acquired directly. In this paper, the relation between the correlation functions and IRFs is meticulously deduced through natural excitation technique (NExT). Furthermore, considering that the structure is a real-modal system, the intensity of each excitation is identified when the structure is discrete and the mass matrix is diagonal. Using the identified mode parameters and the intensity of the excitations, the IRFs of the structure are reconstructed by correlation functions. A simulation is employed to validate the reliability of the relation derived between the correlation functions and the IRFs. Related Articles | Metrics

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Global Behavior Analysis of the Quasi-zero Stiffness Vibration Isolation System with Flexible Foundation 2017, 37(3): 19-23.  DOI: 10.3969/j.issn.1006-1355.2017.03.004 Abstract ( )   PDF (2041KB) ( )   Related Articles | Metrics

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Energy Transfer Efficiency of Nonlinear Vibration Absorbers  under Harmonic Excitations 2017, 37(3): 24-30.  DOI: 10.3969/j.issn.1006-1355.2017.03.005 Abstract ( )   PDF (1786KB) ( )   Related Articles | Metrics

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Research of Sound Radiation Characteristics of a Stiffened Cylindrical Shell and Its Acoustic Optimal Design 2017, 37(3): 31-36.  DOI: 10.3969/j.issn.1006-1355.2017.03.006 Abstract ( )   PDF (1521KB) ( )   In order to study the full-band acoustic radiation characteristics of stiffened cylindrical shells, the low frequency calculation model based on FE-BEM method, the mid frequency calculation model based on FE-SEA method, the high frequency calculation model based on SEA method are established in VA-ONE, and which are used to analyze their radiated sound power. The acoustic radiation efficiency of each mode is studied from the view of the inherent mode of the structure. The results show that the reinforcement can reduce the total radiated sound power of the cylindrical shell structure, especially, it can reduce the radiated sound power of the low frequency band. In the middle and low frequency region, the modal radiation efficiency of each mode is very different. In the middle and high frequency region, the difference is not obvious. The influence of the excitation position, shell thickness, material ,constraint conditions and radiation medium on the acoustic radiation characteristics of stiffened cylindrical shell is further studied. In order to reduce the radiated sound power of the stiffened cylindrical shell to the external field, the acoustic optimization design was carried out based on the NCT module and Design Optimization module, The results show that the combination of GA algorithm and SQP algorithm or MMA algorithm can not only reduce the computing time, but also can obtain a better optimization scheme. Related Articles | Metrics

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Analysis of the Influence of Sectional Structure on Vibration Characteristics of Wind Turbine Towers 2017, 37(3): 37-41.  DOI: 10.3969/j.issn.1006-1355.2017.03.007 Abstract ( )   PDF (1532KB) ( )   Related Articles | Metrics

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Experimental Study on Friction Characteristics and Water Film Stiffness of Water Lubricated Rubber Bearings 2017, 37(3): 42-46.  DOI: 10.3969/j.issn.1006-1355.2017.03.008 Abstract ( )   PDF (1494KB) ( )   Experimental studies are carried out to reveal relationship between friction characteristics of water lubricated rubber bearings and bearing dimensions, friction characteristics of two types of water lubricated bearings were firstly tested by bearing friction test rigs, then their friction characteristics were modeled and compared. Bearing friction test rig was later used to test water film stiffness of water lubricated rubber bearings, and effect of rotational speed on water film stiffness was discussed. Results show that experimental data based on small size bearings can be extended to large size bearings, friction coefficient increases with the increase of bearing size. Rotational speed has little effect on bearing water film stiffness, water film stiffness is much higher than series stiffness of main shaft and rubber bearing. Related Articles | Metrics

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Analysis of Underwater Jet Noise Prediction Method Based on Large Eddy Simulation 2017, 37(3): 47-51.  DOI: 10.3969/j.issn.1006-1355.2017.03.009 Abstract ( )   PDF (1428KB) ( )   Related Articles | Metrics

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Research on Electromagnetic Vibration and Noise Prediction for Vehicle Alternators 2017, 37(3): 52-57.  DOI: 10.3969/j.issn.1006-1355.2017.03.010 Abstract ( )   PDF (1768KB) ( )   Related Articles | Metrics

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Modal Simulation and Test Analysis of a Claw-pole Alternator 2017, 37(3): 58-61.  DOI: 10.3969/j.issn.1006-1355.2017.03.011 Abstract ( )   PDF (1773KB) ( )   Related Articles | Metrics

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Analysis of the Effect of Base Stiffness on Control Performance of Passive-active Vibration Isolation Systems 2017, 37(3): 62-65.  DOI: 10.3969/j.issn.1006-1355.2017.03.012 Abstract ( )   PDF (1470KB) ( )   Related Articles | Metrics

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Improvement of Frequency Characteristics of Oil Pans by Using Twice Shell Bead Optimizations with Sensitive Algorithm 2017, 37(3): 66-71.  DOI: 10.3969/j.issn.1006-1355.2017.03.013 Abstract ( )   PDF (2201KB) ( )   The dynamic redesigning of oil pan in automobile has been improved by shell bead optimization with sensitivity algorithm. Since the exponential growth of high order modes damping, which will reduce the resonance influence of dynamic structures, it is take the first 12th eigenfrequencys in to account for optimization. The both two objective functions of twice optimization are maximize first 12th eigenfrequencys and 600Hz band gap optimization. Meanwhile, the whole optimization process are designed by twice modal optimization iterations, in which, the first 12th eigenfrequencys have been improved higher than activate frequency of 200Hz successfully, and also been driven apart from 600Hz. Finally, the optimized oil pan has been examined by modal FEM analysis, and manufactured by numerical control processing, which realized the design, optimization and manufacture integration processing. Related Articles | Metrics

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A New Method for Stiffness Identification of  Duffing Nonlinear Systems 2017, 37(3): 72-77.  DOI: 10.3969/j.issn.1006-1355.2017.03.014 Abstract ( )   PDF (1267KB) ( )   Related Articles | Metrics

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Study on Variation Laws of Natural Frequencies of Simply Supported Steel I-Beams with Pretensioned Strings 2017, 37(3): 78-81.  DOI: 10.3969/j.issn.1006-1355.2017.03.015 Abstract ( )   PDF (1316KB) ( )   In order to study the changing regularities and reasons for natural frequency of prestressed simply supported steel I-beams under different working conditions, dynamic tests on two groups of simply supported steel I-beams with different level of external prestressing were carried out, based on the result of experiments of simply supported steel I-beams with prestressed tendons, finite element models of a simply supported steel I-beam and a simply supported steel I-beams with prestressed tendons were established. The experimental results and the analysis results of the models show that the tension, eccentric distance and linear arrangement of prestressing tendons have impact on the natural frequency of prestressed simply supported I-steel beam, eccentric distance and the linear arrangement of prestressing tendons have great influence on the natural frequency of the prestressed steel beams, and the influence of the tension of the prestressing tendon is small. Related Articles | Metrics

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Structural Modal Parameter Identification Based on Improved QPSO Algorithm 2017, 37(3): 82-87.  DOI: 10.3969/j.issn.1006-1355.2017.03.016 Abstract ( )   PDF (1384KB) ( )   Related Articles | Metrics

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Adaptive FCLMS Algorithm for Nonlinear Active Noise Control Based on Chebshev Filter 2017, 37(3): 88-91.  DOI: 10.3969/j.issn.1006-1355.2017.03.017 Abstract ( )   PDF (1358KB) ( )   Related Articles | Metrics

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Dynamic Analysis and Test of 2-DOF Vibration Isolation System of a Refrigerator Compressor 2017, 37(3): 92-95.  DOI: 10.3969/j.issn.1006-1355.2017.03.018 Abstract ( )   PDF (1266KB) ( )   Related Articles | Metrics

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Characteristics and Contribution Analysis of Interior Noise Sources of a 250 km/h Internal Combustion Multiple Unit 2017, 37(3): 96-100.  DOI: 10.3969/j.issn.1006-1355.2017.03.019 Abstract ( )   PDF (1847KB) ( )   Related Articles | Metrics

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Research on the S&R Evaluation Method of Automobile Seats Based on the BSR Tests 2017, 37(3): 101-106.  DOI: 10.3969/j.issn.1006-1355.2017.03.020 Abstract ( )   PDF (1541KB) ( )   In order to determine whether the specific parts has BSR phenomenons, Squeak and Rattle shaker system are employed for the subjective evaluation of BSR tests. Subjective evaluation relies heavily on experienced engineer and is less coherent. Based on the detailed description of seat S&R test method , the method of evaluating the seat noise is discussed. Through the analysis of the subjective evaluation results and the acoustic parameters data, the objective acoustic parameters which can reflect the subjective evaluation results are summarized. The method is close to the engineering practice and can identify the BSR problem. Related Articles | Metrics

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Rubber Bush’s Dynamic Stiffness Equivalent Method in Modal Analysis and Computation of Subframes 2017, 37(3): 107-111.  DOI: 10.3969/j.issn.1006-1355.2017.03.021 Abstract ( )   PDF (1557KB) ( )   Aiming at the problem of rubber bushings boundary in calculating modal analysis of subframe,CBUSH unit was used to simulate the rubber bush in finite element analysis software with equivalent value of rubber bushings’s dynamic stiffness. Based on the ratio of dynamic stiffness to static stiffness, a dynamic stiffness equivalent method based on static stiffness of rubber bushings is proposed which called rubber bushings dynamic stiffness correction coefficient equivalent method. By comparing the experimental modal and the calculated modal, the validity of the dynamic stiffness equivalent method of rubber bushings is proved by using the orthogonal experimental design, and the influence of rubber bushings on the accuracy of the model is clarified,which can be applied to the related modeling analysis. Related Articles | Metrics

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Application of Partial Coherence Analysis in Interior Noise  Reduction of Passenger Cars 2017, 37(3): 112-116.  DOI: 10.3969/j.issn.1006-1355.2017.03.022 Abstract ( )   PDF (1367KB) ( )   The interior low-frequency noise has been attracted the focuses of automotive NVH research. It always needs to identify the vibrating structures that have greater impact on interior noise. Contribution of vibration to the noise of field points fails to completely represent the contribution to the whole interior acoustic field. For the interior acoustic field with multiple frequency peaks and multiple field points, the "total coherence coefficient "and "coherence coefficient sum", as two new parameters were introduced to improve the existing partial coherence analysis method. Then the interior noise of the passenger car was analyzed by wavelet packet and the acoustic characteristics of the interior acoustic field and the concerned frequency range were obtained. The structures having greater impact on interior noise were identified by the coherence analysis of panel vibration and noise signal and the improvement measures were carried out on the actural car. The results of test showed that the noise of field points reduces 0.5-2dB. This method provides a reference for reducing the interior noise of passenger car with multiple field points. Related Articles | Metrics

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Multi-object Optimization of Vehicle Engine Mounting Systems 2017, 37(3): 117-121.  DOI: 10.3969/j.issn.1006-1355.2017.03.023 Abstract ( )   PDF (1284KB) ( )   Engine mounting system is very important for automobile vibration and noise control. By considering the coupling factors of body and engine mounting system, a 15-degree model considering coupled vibration between the vehicle body and the engine was proposed. A multi-object optimization concurrently considering both decoupling rate in Torque Roll Axis coordinate system and transferred forces was defined as the objective function. And all of common driving conditions were considered. The particle swarm optimization (PSO) algorithm was used to optimize the mounting stiffness parameters, which used the excitation forces identified as the actual force input. The results show that transferred forces can be reduced effectively by choosing proper parameters of the mounting stiffness and the decoupling rate increases. The comfort of automobile can be improved. Related Articles | Metrics

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Analysis of Automobile Exhaust Noise Based on Instantaneous Frequency Speed Extraction Algorithm 2017, 37(3): 122-125.  DOI: 10.3969/j.issn.1006-1355.2017.03.024 Abstract ( )   PDF (1429KB) ( )   Related Articles | Metrics

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Modeling and Analysis of Vibration Constraint Condition of  Vehicle’s Front Side Window Glass Based on Response Surface Method 2017, 37(3): 126-130.  DOI: 10.3969/j.issn.1006-1355.2017.03.025 Abstract ( )   PDF (1556KB) ( )   Related Articles | Metrics

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Study on the Influence of Body Structures and Damping  Material Properties on NVH Performance of Vehicles 2017, 37(3): 131-134.  DOI: 10.3969/j.issn.1006-1355.2017.03.026 Abstract ( )   PDF (1652KB) ( )   In order to improve the NVH performance of a vehicle, the body structure has been discussed and its strain energy has been analyses. And then, the stone crash protection coating and bitumen deadener has been optimized to have NVH performance test. The test results showed that, the sound pressure level was obvious reduced after optimize. According to the contrastive analysis of the test result between, the features of the two damping materials had been got and the optimal combining scheme had been provided. This analysis and test method could be referenced to another vehicle. Related Articles | Metrics

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Numerical Study on Aerodynamic Noise of Road Sweeper Fan 2017, 37(3): 135-140.  DOI: 10.3969/j.issn.1006-1355.2017.03.027 Abstract ( )   PDF (2207KB) ( )   Based on the aerodynamic noise of road sweeper fan, the Lighthill acoustic analogy and CFD technique had been used to investigate the unsteady flow field and aerodynamic field of road sweeper fan. To obtain the sound power level distribution and aerodynamic noise spectrum characteristics. The calculation result shows that the noise source of road sweeper fan was mainly distributed in the blade suction surface and the tongue region. The noise of road sweeper fan was mainly low frequency noise and pressure fluctuation of suction surface was the main source of low frequency noise. The proportion of the discrete noise in aerodynamic noise was larger. The key factor was the designing of blade and volute tongue when studying on noise reduction of road sweeper fan. Related Articles | Metrics

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Resonance Test Analysis and Improvement of a Tri-axle Off-road Vehicle 2017, 37(3): 141-146.  DOI: 10.3969/j.issn.1006-1355.2017.03.028 Abstract ( )   PDF (2125KB) ( )   Related Articles | Metrics

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Measurement and Analysis of Environmental  Vibration in a Bridge Pier of Cheng-Guan High-speed Railway 2017, 37(3): 147-150.  DOI: 10.3969/j.issn.1006-1355.2017.03.029 Abstract ( )   PDF (1576KB) ( )   In-situ tests have been conducted on the bridge pier ground and preliminary revealed the environmental vibration characteristic of Cheng-guan high-speed railway. By using regression analysis method, the attenuation formula of vertical vibration is fitted. The results shows that the vibration acceleration decrease gradually with the increase of the distance from the center of the line and the duration of ground vibration is about 6s.Secondly, the decay rate of the near source attenuation speed is greater than the far source and the energy of environmental vibration is mainly concentrated in 10-63 Hz. Finally, the max vertical vibration value of the bridge pier is in accordance with the exponential decay law. Related Articles | Metrics

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Application of Analytic Energy Operator Demodulation Method to Fault Diagnosis of Rolling Bearings 2017, 37(3): 151-155.  DOI: 10.3969/j.issn.1006-1355.2017.03.030 Abstract ( )   PDF (1510KB) ( )   Related Articles | Metrics

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Fault Diagnosis of Rolling Bearings Based on Improved Multiscale Entropy and VPMCD 2017, 37(3): 156-161.  DOI: 10.3969/j.issn.1006-1355.2017.03.031 Abstract ( )   PDF (1986KB) ( )   Related Articles | Metrics

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Fault Diagnosis of Aircraft Engines Based on Sparse Representation and SVM 2017, 37(3): 162-167.  DOI: 10.3969/j.issn.1006-1355.2017.03.032 Abstract ( )   PDF (2007KB) ( )   For the crack problem of reducer’s first level gear hub of a specific aero-engine and the dismantling difficulty, this paper proposed the fault diagnosis method based on sparse representation and SVM. Firstly, use sparse representation to extract the largest and second largest sparse factors as the feature vectors. Next, recognize the fault with SVM, which maintains high recognition accuracy under small training sample capacity. The analysis of vibration signal from simple reducer and aero-engine had proved the efficiency and engineering value of the proposed method. Related Articles | Metrics

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Monitoring Data Feature Analysis Based on Singular Spectrum Relative Entropy and Grey Absolute Relational Grade 2017, 37(3): 168-172.  DOI: 10.3969/j.issn.1006-1355.2017.03.033 Abstract ( )   PDF (1435KB) ( )   To recognize the changing rules of vibration signals, during the whole process of wheel tread working conditions changes from normal state to slight wore, and then medium wore, at last heavily wore state right before lathing. A new feature extraction model, which based on the singular value decomposition (SVD) combined relative entropy as well as grey absolute relational grade algorism, was proposed in this paper to analyze the Wuhan-Guangzhou PDL GPS measured data of wheel tread wears under 4 operating conditions. Meanwhile, the singular spectrum entropy based controlled experiment was conducted in this paper. The follow-up simulation results proved that when the wheel tread got heavily degraded, the similarity between normal condition signal and heavy-degraded state signal got smaller. As a result, the relative entropy value got larger, whereas the grey relational grade value got smaller. Namely, this two features can effectively describe the performance degradation process of wheel tread. What’s more, the relative entropy was more preferable than the singular spectrum entropy in measuring the wheel tread wearing degrees. Related Articles | Metrics

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A Feature Extraction Method for Gearboxes with Compound Faults Based on MCKD 2017, 37(3): 173-176.  DOI: 10.3969/j.issn.1006-1355.2017.03.034 Abstract ( )   PDF (1469KB) ( )   A feature extraction method of gearbox with compound faults based on maximum correlated kurtosis deconvolution(MCKD) is proposed in this paper. The MCKD method is used to reduce the noise of the original signal and extract the related periodic components. At the same time, this method is compared with the minimum entropy deconvolution(MED), and the results prove the superiority of the MCKD method on noise reduction. The proposed method is applied to the compound fault diagnosis of gearbox, and the fault features are extracted successfully. Related Articles | Metrics

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Experimental Study on the Influence of Operation Conditions on the Vibration of the Pressurized Valves 2017, 37(3): 177-181.  DOI: 10.3969/j.issn.1006-1355.2017.03.035 Abstract ( )   PDF (1714KB) ( )   Related Articles | Metrics

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Vibration Modal Test and Fault Diagnosis Analysis of Water Pumps 2017, 37(3): 182-184.  DOI: 10.3969/j.issn.1006-1355.2017.03.036 Abstract ( )   PDF (1412KB) ( )   Related Articles | Metrics

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Simulation of Anti-shock Buffering Platform with Large Deformations in 3 Directions 2017, 37(3): 185-188.  DOI: 10.3969/j.issn.1006-1355.2017.03.037 Abstract ( )   PDF (2246KB) ( )    Testing equipment need more effective buffering platform under the more rigorous shock environment. A new buffering platform with 3-direction large deformation can provide a reliable working environment for testing equipment placed on its platform, stable power supply and enough operating space in the progress of impact test. Buffering platform is a elastic platform that consists of large deformation air springs with air damping cavity, which configures isolation transformer and high power uninterrupted power supply according to ship electrical power system. Based on theoretical analysis by MSC.Nastran software, laboratory test and practical equipment impact test, it is demonstrated that testing equipment buffering platform is a necessary protection establishment for reliably acquiring testing data during the impact test.  Related Articles | Metrics

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Design of a Broadband Intake Muffler and Its Application in Tractors 2017, 37(3): 189-192.  DOI: 10.3969/j.issn.1006-1355.2017.03.038 Abstract ( )   PDF (1353KB) ( )   The noise in the engine intake system of the tractor is excessive, which is seriously affect the physical and mental health of driver. So it is necessary to make the noise reduction design. Firstly, the intake noise characteristics is analysed based on experimental testing. Secondly, based on the theory of straight-through perforated tube, the perforated tube is seen as a resonant silencing unit. A multi-cavity resonance-type structure is proposed in this paper which is aimed at broadband noise. And meanwhile, the Virtual. Lab software is used to simulate the acoustic performance of the muffler. Finally, the muffler is assembled into the tractor to verify the effectiveness of the proposed structure. The result shows that the numerical simulation results are well fitted with the experimental results. The designed muffler can effectively reduce the intake system noise and the amount of noise elimination can achieve 15dB(A), which is superior to the requirement of the National Standard. Related Articles | Metrics

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Error Analysis and Correction of Transmission Loss of the Muffler with a Transition Pipe 2017, 37(3): 193-196.  DOI: 10.3969/j.issn.1006-1355.2017.03.039 Abstract ( )   PDF (1511KB) ( )   For different diameter，the test tube is connected to the muffler via a conical tube, leading to error introduction in the transmission loss test. The influence of the cross - sectional area ratio of the conical transition pipe, the length of the conical pipe and passing frequency are analyzed by the finite element method. It is found that the error introduced by the conical transition tube mainly causes the transmission loss to be peak-valley oscillation and the low frequency band error is higher than the high frequency band. When the conical tube cross-sectional area ratio is large, the error is also large. Increasing the length of the conical tube are conducive to reducing the error. The error at the passing frequency is minimized. Moreover, this paper presents a modified algorithm based on the two-load method, which can effectively eliminate the error introduced by the conical transition tube. Related Articles | Metrics

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Fluid Pipe Nondestructive Testing Based on Ultrasonic Guided Waves 2017, 37(3): 197-202.  DOI: 10.3969/j.issn.1006-1355.2017.03.040 Abstract ( )   PDF (1632KB) ( )   Related Articles | Metrics

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Experimental Study on Engine Noise Source Identification Based on Acoustic Holography 2017, 37(3): 203-206.  DOI: 10.3969/j.issn.1006-1355.2017.03.041 Abstract ( )   PDF (1546KB) ( )   Acoustic holography technique was applied to the experiment of noise source identification for a 3 cylinder gasoline engine. In the first place, 1 meter sound pressure level test was put into effect respectively on the engine bench, which helped to find the intake side of the engine radiated the biggest noise. Then, acoustic holography test was experimented in the intake side, and came to a conclusion that the main noise source of the intake side locales in the generator area by analyzing sound pressure nephogram and noise spectrum, and the band of the frenquency is between 1000Hz and 2500Hz. To locate where the main noise source is, a new experiment combined near-field sound pressure and surface vibration methods was done in the generator area which is detected by acoustic holography. The result shows that both the frenquency band of vibration peak and noise peak are between 1000-2500Hz that is the same as the frenquency band detected by acoustic holograph, which proves the main noise source of the intake side is on the generator. Combined acoustic holography technique and traditional noise source identification methods to do the experiment of engine noise source identification, not only increase the efficiency of traditional methods, but the precision of acoustic holography technique. Related Articles | Metrics

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Noise Testing, Analysis and Noise Reduction Measures of the Device and its Supporting Structure in a Space Station 2017, 37(3): 207-210.  DOI: 10.3969/j.issn.1006-1355.2017.03.042 Abstract ( )   PDF (1150KB) ( )   Related Articles | Metrics

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Low Frequency Noise Control of Vertical HRSG in a Gas Power Plant 2017, 37(3): 211-216.  DOI: 10.3969/j.issn.1006-1355.2017.03.043 Abstract ( )   PDF (1500KB) ( )   Related Articles | Metrics