NVH Analysis of Powertrain Start/Stop Transient Phenomenon by using Wavelet Analysis and Time Domain Transfer Path Analysis

Rao, Manchi Venkateswara; Moorthy, S Nataraja; Raghavendran, Prasath

doi:10.4271/2015-01-2293

Cited by 10 publications

(5 citation statements)

References 5 publications

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Section: Analysis Of Vibration Characteristics Of Exhaust Systemmentioning

confidence: 99%

“…17 Therefore, the powertrain system is considered in the exhaust system constraint modal analysis, and the manifold connecting the powertrain and the exhaust system is taken into account. 18 The constraint condition of the system is zero displacement constraint of six degrees of freedom on the end of powertrain mounting and exhaust rubber mounting connected to the vehicle body. Abaqus software is also used as the solver, Lanczos method is used to calculate exhaust system constraint modes, and extracted frequencies are shown in Table 8.…”

Section: Modal Analysis Of Exhaust Systemmentioning

confidence: 99%

See 1 more Smart Citation

Research on noise control of automobile exhaust system under idling condition based on modal analysis

Xiao

Cheng

2023

Advances in Mechanical Engineering

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Correlational studies of vibration characteristics theory of exhaust system, optimization design of idling vibration control and the noise test analysis were conducted to solve the problems of body vibration and exhaust noise under idling condition. Firstly, the analysis of vibration mode, dynamic response and vibration transfer of exhaust system were carried out by using the simulation analysis, and the location of the exhaust system hangers were verified. Furthermore, the structure optimization schemes of exhaust system were proposed for exhaust noise reduction under idling condition based on control of local stiffness optimization, constraint location optimization and system global stiffness optimization. Finally, the interior and exhaust noise and system vibration of optimization schemes were tested under idling condition, and the exhaust noise was verified under rapid acceleration condition respectively. Meanwhile, the vibration response of exhaust system was analyzed. Results showed that the optimization schemes had better noise attenuation effect than the original scheme under idling and rapid acceleration conditions, indicating that it was necessary not only to effectively avoid the idling frequency interval of engine, but also to improve the structural stiffness and the vibration of local structure according to the vibration mode, and minimize the modification of the internal structure of the exhaust system.

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Section: Analysis Of Vibration Characteristics Of Exhaust Systemmentioning

confidence: 99%

Section: Modal Analysis Of Exhaust Systemmentioning

confidence: 99%

Research on noise control of automobile exhaust system under idling condition based on modal analysis

Xiao

Cheng

2023

Advances in Mechanical Engineering

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“…The crankshaft rotates together with the parts connected to it, such as the flywheel and the connecting rod, for which the speed is lower. The torque generated by the combustion pressure is the main excitation source of the vehicle key-on vibrations, and the torque acting on the crankshaft can be simplified as 7…”

Section: Powertrain Vibration Analysis and Evaluation Index During Thmentioning

confidence: 99%

“…Sugimura et al 7 analysed the transfer path of the powertrain vibrations when the engine starts, and the results show that vehicle key on vibrations and shock mainly come from the mount system when the vehicle is in the standstill state. In order to decrease the vibrations of the powertrain under these two conditions, the powertrain mount system should be optimized.…”

Section: Introductionmentioning

confidence: 99%

Design method for a powertrain mounting system to decrease the vehicle key on/off vibrations

Wang

Zhao

Shangguan

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Five dynamic response evaluation indices from the viewpoint of the powertrain mount system and the vehicle system during the vehicle key on/off periods (i.e. the engine start and stop) are proposed. By analysis using different methods to minimize the powertrain vibration, it was found that an increase in the mount system damping can decrease the vehicle key on and key off vibration. For this reason, in this paper a semi-active hydraulic damping strut is designed and made which can provide high damping for a mount system when the vehicle key on/off but switches to lower damping to isolate high-frequency vibrations under normal conditions. The calculated longitudinal acceleration of the powertrain, the jerk of the powertrain, the dynamic force of the mount and the vibration dose value for a vehicle with the semi-active hydraulic damping strut and without the semi-active hydraulic damping strut are compared on the basis of the excitation force identified for the powertrain using a 13-degree-of-freedom vehicle model. Experiments were carried out, and the results show that the use of the semi-active hydraulic damping strut can decrease the engine start and stop vibrations to a large extent. Finally, the experimental results are compared with the calculated values from the 13-degree-of-freedom vehicle model.

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“…24 A comparison between the frequency- and time-domain TPAs has been conducted. 25,26 The results suggested that, the time-domain TPA is suitable for identifying the moving noise sources, but a trade-off between accuracy and time cost needs to be considered. Some TPA methods were presented by combining the simulations and tests.…”

Section: Introductionmentioning

confidence: 99%

Vibration load and transfer path identification of vehicle using inverse matrix method based on singular value decomposition

Yang

Wang

Guo

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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Based on the theory of inverse transfer matrix, a novel method for simultaneous load identification of vehicle vibration is presented in this paper. Some response, excitation, reference points (called key points) and their transfer paths, which have severe effects on the vibration of a whole vehicle, are defined. The transfer functions among the key points are measured by experiments, and thereby a transfer function matrix of vehicle vibration is established. To solve ill-conditioning problem in the transfer function matrix, the methodology of singular value decomposition is introduced into matrix inversion in the excitation load identification. To reduce the identification error, four transfer function matrices with different reference points and condition numbers are selected and discussed. The results show that the more the reference points are, the smaller the condition number of transfer function matrix is, the higher the accuracy of excitation load identification. The transfer function matrix with minimum condition number is used to identify the excitation loads at the vehicle key points. Experimental verifications suggest that the newly proposed method is effective and feasible for excitation load identification of vehicle vibration. Using the identified excitation loads, furthermore, the vibration causes of the steering wheel and seat rail are obtained, which is helpful for improving vibration performance of the sample vehicle. In applications, the excitation load identification method proposed in this paper may be applied not only to other types of vehicle, but also to other complex electromechanical products for load identification in engineering.

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NVH Analysis of Powertrain Start/Stop Transient Phenomenon by using Wavelet Analysis and Time Domain Transfer Path Analysis

Cited by 10 publications

References 5 publications

Research on noise control of automobile exhaust system under idling condition based on modal analysis

Research on noise control of automobile exhaust system under idling condition based on modal analysis

Design method for a powertrain mounting system to decrease the vehicle key on/off vibrations

Vibration load and transfer path identification of vehicle using inverse matrix method based on singular value decomposition

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