Substructuring of multibody systems for numerical transfer path analysis in internal combustion engines

Acri, Antonio; Offner, Günter; Nijman, Eugène; Rejlek, Jan

doi:10.1016/j.ymssp.2016.02.034

Cited by 15 publications

(5 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In common FMBD systems for industrial applications, the contacts between different bodies are often nonlinear. In order to analyze the dynamics of a substructure considering nonlinear connections at interfaces, a numerical transfer path analysis, based on the sub structuring of a multibody system, was proposed [23,24]. The aim of this methodology is to decompose the original system in order to identify vibro-acoustic sources and noise paths of a vibrating subsystem.…”

Section: Sub Structuring Of Multibody System For Numerical Transfer Path Analysismentioning

confidence: 99%

“…The transmissibility based method known as Operational TPA, developed to overcome the disadvantage of having individual measures of each single path from a source to a receiver, was developed by Nomura and Yoshida [19]; further reviews and benchmark studies can be found in [20,21].Recent applications combine the TPA methodology with the novelty of numerical simulations. The Hybrid TPA formulation (HTPA) uses simulated excitation forces as input for TPA analysis, where the vibro-acoustic transfer functions are measured [22], while the Numerical TPA (NTPA) proposed in [23,24] is based on the Dynamic Sub structuring (DS) of flexible multi-body systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of cyclic cylinder pressure variability in the numerical transfer path analysis of multi-body engine

Acri

Nijman

Schweiger

et al. 2019

dom

View full text Add to dashboard Cite

Practical mechanical systems often operate with some degree of uncertainty. The uncertainties can result from poorly known or variable parameters, from uncertain inputs or from rapidly changing forcing that can be best described in a stochastic framework. In automotive applications, cylinder pressure variability is one of the uncertain parameters that engineers have to deal with when designing and analyzing internal combustion engines. Multi-body dynamics is a powerful numerical tool largely implemented during the design of new engines. In this paper the influence of cylinder pressure cyclic variability on the results obtained from the multi-body simulation of engine dynamics is investigated. Particular attention is paid to the influence of these uncertainties on the analysis and the assessment of the different engine vibration sources. A numerical transfer path analysis, based on system dynamic sub structuring is used to derive and assess the internal engine vibration sources. In order to investigate the cyclic variability of cylinder pressure, a Monte Carlo approach is adopted. Starting from measured cylinder pressure that exhibits cyclic variability, random Gaussian distribution of the equivalent force applied on the piston is generated. The aim of this paper is to outline a methodology which can be used to derive correlations between cyclic variability and statistical distribution of results. The statistical information derived can be used to advance the knowledge of the multi-body analysis and the assessment of system sources when uncertain inputs are considered.

show abstract

Section: Sub Structuring Of Multibody System For Numerical Transfer Path Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of cyclic cylinder pressure variability in the numerical transfer path analysis of multi-body engine

Acri

Nijman

Schweiger

et al. 2019

dom

View full text Add to dashboard Cite

show abstract

“…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:

View full text Add to dashboard Cite

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.

show abstract

“…erefore, many automotive manufacturers and researchers have devoted much effort to enhance the NVH performance of automotive. Currently, the techniques to improve the NVH performance of vehicles are generally divided into numerical methods (such as multibody dynamic method [1,2] (MBD), finite element method [3] (FEM), and boundary element method (BEM)) and experimental methods [4] (such as the spectrum analysis and transfer path analysis (TPA) methods [5][6][7]); the numerical methods are usually used to analyze or predict the vibration and noise response (N&V) under some excitation sources by numerical models. However, the numerical models are established based on some condition assumptions, which cannot reflect the real conditions of a physical automotive system.…”

Section: Introductionmentioning

confidence: 99%

Rubber Stiffness Optimization for Floor Vibration Attenuation of a Light Bus Based on Matrix Inversion TPA

Shi

Yang

et al. 2020

Shock and Vibration

View full text Add to dashboard Cite

The NVH characteristics of light buses are a very important performance for market competitiveness. To solve the serious floor vibration of a light bus at speed of 60 km/h and 90 km/h, we first derive the matrix inversion TPA (MITPA) method, and then transfer path contribution is analyzed by applying matrix inversion TPA with TPA model establishment, operational vibration test, and FRF measurement. Next, the energy decoupling rate of the powertrain mount system (PMS) is optimized by rubber stiffness optimization based on the path contribution analysis taking both amplitude and phase into consideration. The optimized natural frequencies and energy decoupling rate indicate that energy decoupling rate (EDR) of each DoF of the powertrain mount system is improved. Finally, to verify the optimization effect, this paper implements an operational vibration test with optimized mount installed. The results indicate that floor vibration of postoptimization is improved significantly compared with that of preoptimization. This paper offers a method for engineers to improve vibration problem of vehicle by combining experimental TPA for identification of dominant paths with optimization procedure.

show abstract

Substructuring of multibody systems for numerical transfer path analysis in internal combustion engines

Cited by 15 publications

References 41 publications

Influence of cyclic cylinder pressure variability in the numerical transfer path analysis of multi-body engine

Influence of cyclic cylinder pressure variability in the numerical transfer path analysis of multi-body engine

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

Rubber Stiffness Optimization for Floor Vibration Attenuation of a Light Bus Based on Matrix Inversion TPA

Contact Info

Product

Resources

About