Hybrid acoustic synthesis – Assessment of rear final drives in an early stage of development, on the basis of transfer path analyses and test bench measurements

Reising, Mirko; Küçükay, Ferit; Eulert, Sebastian; Decker, Harald; Luehrs, Georg-Friedrich

doi:10.1016/j.apacoust.2013.12.023

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…The operational forces at each transfer path and the transfer function through these paths. The transfer functions are obtained either experimentally or numerically [2,3,14,15] and the operational forces can be directly obtained from measurements using force transducers or estimated via indirect methods [1,5,16]. Assuming that the system is linear, time invariant and that the operational loads can be determined, the total response at the target y t ( ) due to the partial contribution of each path of the system is:…”

Section: Classic and Operational Tpamentioning

confidence: 99%

“…That way, as already motivated, the passive system could be numerically modeled while the active system is fully characterized by dedicated experimental tests. This could be the case of a new product development that makes use of preexisting motor/engine, to whom experimental data is available, including uncertainties about the actual interface impedance [15,25]. Another advantage is that different companies (OEMs and suppliers) can exchange subsystem TPA models without giving in sensitive data about their products.…”

Section: Component-based Tpamentioning

confidence: 99%

“…There are two classes of component-based TPA methods: (I) those that include measurements of the split subsystems [15,25,26] and (II) in situ techniques, i.e., methods that mathematically resemble substructuring techniques but are based on measurements of the actual assembled system [22,23]. There is a special interest in methods of type (I) as they offer a general framework for hybrid modelling and the exchange of TPA models, as mentioned before and, therefore, this paper is devoted to discuss two of these techniques, namely, the blocked force and free-velocity ( Fig.…”

Section: Component-based Tpamentioning

confidence: 99%

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Combining classical and component-based TPA for equivalent load identification

Melo

Oliveira

2020

J Braz. Soc. Mech. Sci. Eng.

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The transfer path analysis (TPA) has become a rather standard tool for solving noise and vibration problems, as it helps understanding the mechanisms responsible for the generation and transmission of those quantities. By better understanding the intricate role of multiple sources and propagation paths, it is possible to diagnose and propose effective modifications that would addresses such issues at specific target locations. Although originally an experimental approach, hybrid methods that include modeled subsystems have been proposed, which allow the assessment of key system features even at stages prior to the construction of full physical prototypes. However, in classical TPA, the operational forces are characteristics of the complete system, which implies that, with each modification in one subsystem, it is necessary to redo all the tests for the correct determination of target functions. For this reason, in recent years, interest has been renewed in the development of faster and simpler techniques for analyzing energy transfer paths, which offer a compromise between workload and accuracy. More specifically, a set of methods called component-based TPA is highlighted, which consists of characterizing the excitation of a source through a set of equivalent forces (or even interface velocities) inherent only to the active subsystem. In this way, the responses at target locations on the passive subsystem could be calculated using these equivalent loads and the dynamics of the complete system, obtained numerically, experimentally or under a hybrid framework. This work presents a critical analysis of the component-based TPA methods and proposes the combined use of these methods with a classical TPA approach in the process of determining equivalent forces of the active subsystem. This set of equivalent forces, combined with the passive subsystem dynamics, allows the prediction of the vibrational behavior of the full assembly at targeted locations, without the need for a full experimental analysis of the assembled system. As the case study presented here consists of a modular academic setup, it allows the qualitative assessment of the method in distinct assembly boundary conditions, in which the subsystems are connected via rigid or flexible joints.

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Section: Classic and Operational Tpamentioning

confidence: 99%

Section: Component-based Tpamentioning

confidence: 99%

Section: Component-based Tpamentioning

confidence: 99%

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Combining classical and component-based TPA for equivalent load identification

Melo

Oliveira

2020

J Braz. Soc. Mech. Sci. Eng.

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“…The classical TPA method as a mature method for analyzing vibration transmission paths was proposed in the 1980s [3][4][5][6][7]20,[22][23][24]27 and is widely used in various industries, 25 especially in the automotive industry. Based on the classical TPA method, a variety of frequencydomain TPA methods have been developed, mainly OPA(Operational TPA), 5,8,9,21,26 OPAX(Operational-X TPA), 10 Component-based TPA, 6,11,12 and GTDT(Global Transfer Direct Transfer method).…”

Section: Introductionmentioning

confidence: 99%

Vibration transmission path analysis of underwater vehicle power plant based on TPA power flow

Yang

Pan

Yin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

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In order to obtain the energy contribution of all paths transmitting vibration from the underwater vehicle power plant to the outer shell, a new method named TPA (Transfer Path Analysis) power flow which combines classical TPA and power flow theory was proposed. Calculation results showed that isolators were the critical paths for transmitting vibration energy to the shell in low frequency band. In addition the main engine and sea water pump were critical vibration sources, which provided directions for reducing the vibration energy transmitted from vibration sources to the target body. To the best of our knowledge, this was the first time to assess the vibration transmission path of the underwater vehicle by TPA power flow method. This method can be employed in other works that need to evaluate the contribution of vibration energy.

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“…Yan and Weikang [11] studied influences of radiation noises of plates on interior noises of a car by OTPA based on local singular value decomposition. Reising et al [12] applied OTPA based on SVD to effectively assess acoustic characteristics of the driven axle in automobiles. Commonly, the traditional OTPA identifies transmissibility functions to analyze the transfer path characteristics [6].…”

Section: Introductionmentioning

confidence: 99%

Transfer Path Analysis and Contribution Evaluation Using SVD- and PCA-Based Operational Transfer Path Analysis

Cheng

Blamaud

Chu

et al. 2020

Shock and Vibration

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To quantitatively identify the transfer paths and evaluate path contributions of shell structures, an singular value decomposition- (SVD-) and principal component analysis- (PCA-) based operational transfer path analysis method is constructed and studied in this paper. Firstly, SVD is used to determine the contribution of each path and reduce crosstalk. Secondly, PCA is applied to reduce the influence of unwanted frequency components and thus reduce noises. This allows the presented OTPA to be more accurate than its traditional counterpart. Once the transmissibility function is obtained, the response synthesis is determined, and the transfer path analysis and path contribution evaluation can be effectively carried out. Numerical and experimental case studies are carried out to validate and test the performance of the presented method. Furthermore, a comprehensive observing the influences of correlation between sources and distance of sources and receiver is also provided. Generally, this paper provides accurate transfer path analysis and path contributions for mechanical systems, which can benefit vibration and noise monitoring and reduction through vibration reduction structure design for new equipment or vibration damping on the major vibration transfer paths for current equipment.

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Hybrid acoustic synthesis – Assessment of rear final drives in an early stage of development, on the basis of transfer path analyses and test bench measurements

Cited by 10 publications

References 1 publication

Combining classical and component-based TPA for equivalent load identification

Combining classical and component-based TPA for equivalent load identification

Vibration transmission path analysis of underwater vehicle power plant based on TPA power flow

Transfer Path Analysis and Contribution Evaluation Using SVD- and PCA-Based Operational Transfer Path Analysis

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