Vibro-Acoustic Transfer Function and Driving-Point Conductance for Vehicle Body.

晃司, 門松; 良久, 岩永

doi:10.1299/kikaic.68.3561

Cited by 4 publications

References 1 publication

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A Study on Comparison between Input Powers and Contribution Rates from Statistical Energy Analysis and Transfer Path Analysis on a Mechanical Structure

Kuroda

Yamazaki

2013

JSDD

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This paper presents a method for comparing the input powers and contribution rates from a power source to a structure in machine operation determined by statistical energy analysis (SEA) and transfer path analysis (TPA). Identifying external forces and contribution rates from input power sources during machine operation is important for analyzing machine and equipment, and dynamic designs. SEA is used for systems with many resonant modes, and predicted results are based on spatial averages. In contrast, TPA is based on estimation of a frequency response function between an excitation point and a response point. In this study, a method is proposed for comparing SEA evaluated by the power injection method and TPA evaluated by the matrix inversion method. The proposed method is validated through numerical analyses, using a finite element method of a simple structure consisting of two flat plates connected in an L-shaped configuration and a partial car model consisting of four subsystems. As a result, the SEA input power is spatial averaged over each subsystem quantitatively agrees with the TPA input power expressed as the product of the force and velocity at the excitation point. Contribution rates from a power source, the SEA and TPA results are qualitatively similar without having to consider the phase.

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A Study on Comparison between Input Powers and Contribution Rates from Statistical Energy Analysis and Transfer Path Analysis on a Mechanical Structure

Kuroda

Yamazaki

2013

JSDD

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Reduction of input power to the structure by the configuration of supporting rigid link mechanics

Kosaka

Inoue

Takagi

2014

Transactions of the JSME (In Japanese)

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Suspension of a vehicle plays an important role on the vibration insulation mechanism for reducing the structure born road noise. Using a low stiffness suspension bush is one of the typical countermeasure for the vibration insulation, but such a countermeasure makes the driving stability and the handling comfort worse. The suspension design which achieves the both performance at high level is required in the automotive industry these day. As one of the possible way to achieve the requirement, the road noise reduction by the suspension geometry which has not been investigated so far is presented in this paper. For simplicity, the two dimensional simple model considering a multi-link suspension which consists of the rigid links as suspension and the simply supported elastic beam as body is used. The motion of the suspension forms the energy flow from the road surface to the vehicle body to which the suspension is connected at multiple points. The energy flow which doesn't supply power to the vehicle body is found by the shape optimization based on the sensitivity analysis with respect to the suspension geometry. The shape optimization result shows maximized negative input power contribution at frequencies of interest. And the energy flow change is done by making the particular mode hardly resonant by having node of its mode shape at the excitation point. Moreover, the effect of the mode shape change appears as input power reduction at other frequency range. These effects are analysed by input power modal expansion.

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Research on Mechanism of Change in Suspension Transfer Force in Relation to Low-Frequency Road Noise

Ichikawa

2015

SAE Int. J. Passeng. Cars - Mech. Syst.

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Vibro-Acoustic Transfer Function and Driving-Point Conductance for Vehicle Body.

Cited by 4 publications

References 1 publication

A Study on Comparison between Input Powers and Contribution Rates from Statistical Energy Analysis and Transfer Path Analysis on a Mechanical Structure

A Study on Comparison between Input Powers and Contribution Rates from Statistical Energy Analysis and Transfer Path Analysis on a Mechanical Structure

Reduction of input power to the structure by the configuration of supporting rigid link mechanics

Research on Mechanism of Change in Suspension Transfer Force in Relation to Low-Frequency Road Noise

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