10-degree of Freedom Modeling of Full Car Based on Base Excitation Modal Testing

Kim, Mi-reu; Kim, Kwang-joon; Lee, Kang-in; Bae, Byungkook

doi:10.5050/ksnve.2017.27.6.684

Cited by 3 publications

(1 citation statement)

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“…From the perspective of PMS itself, with stiffness, damping, layout angle and position as design variables, the natural frequency of the PMS is reasonably configured, and the decoupling rate, supporting force and vibration isolation rate are optimized by six degree-of-freedoms (DOFs) models to improve the vibration isolation performance of PMS [2,9,10]. From the perspective of vehicle, the influence of mounting parameters on the vehicle vibration is studied by the multi-degree-of-freedom models to improve vehicle NVH performance [11][12][13]. However, due to factors such as manufacturing errors, assembly errors, material aging and complex working conditions, the stability of vibration isolation performance is affected [14].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a commercial vehicle powertrain mounting system based on new rubber mounts

Shen,

Zhang,

Jin

2024

J. vibroeng.

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In order to improve the vibration isolation, environmental adaptability and development efficiency of rubber mounts, a novel rubber mount with adjustable parameters such as stiffness, support height and limit distance was proposed, and its structural composition and working principle were described. And then, a commercial vehicle was taken as the research object to conduct the calculation of mounts stiffness by employing the energy decoupling method and genetic algorithm. On the basis of the influence of cone angle, thickness and height on the ratio of axial-radial stiffness, the detailed structural design of the mounts was carried out, and the relationship between the preloading displacement and axial-radial stiffness was studied by the method of theoretical calculation and test, which made the process of the stiffness adjustment more specific and accurate. Finally, the vibration isolation performance test of the Powertrain Mounting System (PMS) before and after stiffness adjustment was completed. Results show that the adjusted PMS indicates better vibration isolation performance at idle speed and slow acceleration in place, and the new mounts can effectively improve the vibration performance of vehicle, environmental adaptability of mounts and product development efficiency.

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Section: Introductionmentioning

confidence: 99%

Optimization of a commercial vehicle powertrain mounting system based on new rubber mounts

Shen,

Zhang,

Jin

2024

J. vibroeng.

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Modal and Forced Response Analysis of Vehicle Systems With Latent Vibration Modes Due to Hydraulic Mounts

Sakong

Hur

Kim

et al. 2020

Journal of Vibration and Acoustics

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Hydraulic mounts used in vehicles for better isolation of vibrations were often approximated by lumped or mechanical mass-damper-spring (m-c-k) models, although deficiency in such modeling was pointed out and “hydraulic” modeling was proposed as an alternative. In this paper, a brief review on the mechanical m-c-k modeling and “hydraulic” modeling of the hydraulic mounts is presented. A simplest system consisting of a single mass and a hydraulic mount is used to illustrate both equivalence and difference in a closed form between the two modeling approaches. Then, modal analyses are done on an apparently three degrees-of-freedom (DOF) quarter car with a hydraulic mount, where the key idea is to use an internal variable for the movement of fluid mass which is responsible for a “latent” vibration mode. Equations of motion for the apparently 3DOF system, 4DOF system in fact, by the two modeling are formulated. Modal parameters by the proposed “hydraulic” modeling of the hydraulic mount are compared with those by the m-c-k modeling. Forced responses to transient base excitations are also compared between the two modeling approaches to illustrate how much errors can arise in the frequency and time domain analysis. To be more realistic, the modal and forced response analysis on a full car of an apparently 10DOF (3DOF for powertrain, 3DOF for car body, and 4DOF for knuckles and tires) with two more DOF internally for two hydraulic mounts between the powertrain and car body is presented.

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Vibration Analysis for a 12-DOF Full Car Model with Hydraulic Engine Mounts of Frequency Dependent Stiffness and Damping

Sakong¹,

Kim²,

Jeon³

2018

SAE Technical Paper Series

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10-degree of Freedom Modeling of Full Car Based on Base Excitation Modal Testing

Cited by 3 publications

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Optimization of a commercial vehicle powertrain mounting system based on new rubber mounts

Optimization of a commercial vehicle powertrain mounting system based on new rubber mounts

Modal and Forced Response Analysis of Vehicle Systems With Latent Vibration Modes Due to Hydraulic Mounts

Vibration Analysis for a 12-DOF Full Car Model with Hydraulic Engine Mounts of Frequency Dependent Stiffness and Damping

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