Simulation of Engine Idle Shake Vibration

Radcliffe, Clark J.; Picklemann, Mark N.; Spiekermann, Charles E.; Hine, Donald S.

doi:10.4271/830259

Cited by 12 publications

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“…It is common to consider engine mounts as the main parts that connect the engine to the foundation (Brach, 1997;Suh and Smith, 1997). Few articles (Radcliffe et al, 1983) consider other connections such as hoses, drivetrains, and the exhaust system as important vibration paths. Each mount is usually modeled as a spring-damper system with two parameters, stiffness coefficient and corresponding hysteresis or viscous damping.…”

Section: $! <Ageb7h6g<bamentioning

confidence: 99%

Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis

Foumani

Khajepour

Durali

2003

Journal of Vibration and Control

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In this paper an experimental/numerical technique is developed for engine mount optimization. The method is general and can be applied to optimize active and passive vibration isolators or absorbers in any mechanical systems or civil structures. Engine mount optimization techniques mostly rely on an accurate mathematical model of the whole vehicle, which in most cases is not available or is too difficult to develop. As a result, the current approach for selecting engine mounts for a vehicle is based upon trial and error which is very time-consuming and expensive. The proposed technique counts upon experimental data for optimization and does not require any mathematical model of the vehicle or its components. The required experiments are similar to the current trial-and-error based experiments performed on a vehicle for mounts selection. The method is evaluated experimentally using a quarter car model and the results corroborate the proposed optimization method.

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Section: $! <Ageb7h6g<bamentioning

confidence: 99%

Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis

Foumani

Khajepour

Durali

2003

Journal of Vibration and Control

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“…To this end, simplified engine models have been proposed for estimating some performance measures. For instance, a rigid body engine block model may be used for designing engine mounting systems (e.g., [10][11][12][13]). These models, however all ignore the dynamic coupling with the crankshaft.…”

Section: Introductionmentioning

confidence: 99%

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Dong

Perkins

2003

Multibody System Dynamics

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The equations of motion for the major components in an internal combustion engine are developed herein using a recursive formulation. These components include the (rigid) engine block, pistons, connecting rods, (flexible) crankshaft, balance shafts, main bearings, and engine mounts. Relative coordinates are employed that automatically satisfy all constraints and therefore lead to the minimum set of ordinary differential equations of motion. The derivation of the equations of motion is automated through the use of computer algebra as the precursor to automatically generating the computational (C or Fortran) subroutines for numerical integration. The entire automated procedure forms the basis for an engine modeling template that may be used to support the up-front design of engines for noise and vibration targets. This procedure is demonstrated on an example engine under free (idealized) and firing conditions and the predicted engine responses are compared with results from an ADAMS model. Results obtained by using different bearing models, including linear, nonlinear, and hydrodynamic bearing models, are discussed in detail.

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“…Os demais coxins são denominados coxins restritores de torque por terem a função apenas de restringir o movimento do motor devido torque por ele exercido. Essa denominação é baseada na nomenclatura adotada pelas montadoras e fornecedores dos isoladores.As práticas de desacoplamento da linha de torque neutro e da separação modal também são aplicadas no sistema transversal, de acordo com(JOHNSON e SUBHEDAR, 1979;RADCLIFFE, PICKLEMANN e SPIEKERMANN, 1983;BERNUCHON, 1984;GECK e PATTON, 1984; ARAI, KUBOZUKA e GRAY, 1993). JOHNSON e SUBHEDAR (1979), sugeriram para o projeto de motores transverais um posicionamento para os modos do motor conforme apresentado naFigura 19.…”

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Modelagem da coxinização de motores para aplicações automotivas.

Andrecioli¹

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O objetivo deste trabalho é estudar sistemas de coxinização, também conhecidos como sistemas de isolamento, desenvolvidos para motores automotivos juntamente com os modelos analíticos para calcular o comportamento dinâmico do motor suspenso, complementados por análises numéricas com o emprego do método dos elementos finitos e estudos experimentais. Estudos para verificar o efeito dos parâmetros de projeto do sistema de coxinização na resposta modal do motor isolado foram realizados utilizando os modelos analíticos desenvolvidos. Foi possível identificar como a variação de tais parâmetros interfere na resposta modal do motor suspenso. Os resultados fornecidos por tais modelos analíticos auxiliaram na compreensão do comportamento modal do sistema, mostrando que são ferramentas úteis para auxiliar o projeto de sistemas de isolamento de motores, especialmente em estágios iniciais do projeto, onde os parâmetros do veículo ainda estão por ser determinados e protótipos ainda não estão disponíveis.

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Simulation of Engine Idle Shake Vibration

Cited by 12 publications

References 0 publications

Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis

Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis

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Modelagem da coxinização de motores para aplicações automotivas.

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