Analytical Approach for Strongly Coupled Vibration System Composed of Two Substructures (2nd Report, Application of Analytical Approach to Vibration of Tire and Wheel on Vehicle)

This paper addresses the cascading design method of NVH (Noise, Vibration and Harshness) performance between an OEM (Original Equipment Manufacturer) and suppliers. The increasing trend toward electric vehicles requires the exploring of cascading design method, because of the easiness of the assembly of the electric vehicles. However, there are difficulties for the cascading design of NVH performance to overcome the coupling problem among each subsystem. It is generally difficult to divide key evaluation characteristics of a whole structure to individual characteristics of each subsystem because of the coupling resonance. In this paper, cascading design method which utilizes the MMC (Mutual Mean Compliance) was proposed. The MMC is used as an index to meet the final NVH target levels of a whole structure. Then, the MMC is cascaded to each subsystem or component. Finally, the cascaded MMC is achieved by improving individual MMCs of each separate subsystem, while being careful about the resonance of a whole structure caused by strong coupling. In the paper, it is shown that the recalculation of MMCs after subsystem's structural modification is feasible using FBS (Frequency response function Based Sub-structuring). In addition, MMC based cascading design method using FBS was defined and organized as a procedure. The method was also verified by a numerical case study.

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Control method for shifting the natural frequency of vibration system coupled by springs

Komada

Matsumura

Kido

et al. 2019

Transactions of the JSME (In Japanese)

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Technology development to improve road induced noise is necessary with the market expansion of the electric motor drive vehicles, because road induced noise is noticeable under no engine noise condition. One of the effective ways to achieve good performance is to avoid the natural frequencies of vehicle bodies from dominant frequencies of the transmitted forces between a suspension and a vehicle body, which vary as the characteristics of road surfaces. For this background, this paper proposes a new method for shifting the natural frequency of coupled two vibration systems which are connected at multi-points by coupling springs assuming semi-active control. Firstly, based on the sub-structuring method, the relation between column vectors in the compliance matrix at connection points of two systems is analyzed to make clear the condition of resonance occurrence. This condition is equivalent that all column vectors of the compliance matrix at connection points exist in a hyperplane. Secondly, utilizing the independence of each coupling spring's degree of freedom, simple equation to calculate a coupling stiffness is derived to satisfy the condition of resonance occurrence. Finally, in a feasibility study, the method was applied to two beams connected with three translational springs. It is showed that the proposed method can shift an initial natural frequency to target frequency with a simple calculation.

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Analytical Approach for Strongly Coupled Vibration System Composed of Two Substructures (2nd Report, Application of Analytical Approach to Vibration of Tire and Wheel on Vehicle)

Cited by 19 publications

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A theoretical three-dimensional ring based model for tire high-order bending vibration

A theoretical three-dimensional ring based model for tire high-order bending vibration

Cascading design method using the relation between mutual mean compliance and frequency response function based sub-structuring

Control method for shifting the natural frequency of vibration system coupled by springs

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