Component-TPA on the Finished Off-road Vehicle for Modular Design

Norio Nakagawa･Ryota Horie･Soichiro Ikegami･Takuro Okazaki･Tomohiro Abe･Shuichi Nakagawa (Yanmar Holdings)

As the diversity of prime movers continues to grow, the applying the component-TPA to the finished off-road vehicles such as construction machinery and agricultural machines is ongoing to realize the modular design. In this study, the effects of the nonlinearity of accelerance in the forced vibration system excited by the prime mover and the condition number when identifying the blocked force using the inverse matrix method have been investigated.

Response Improvement of a Structural-Acoustic Coupled System using Operational Sensitivity Analysis

Mineto Hashiba (Nissan Motor)･Takuya Yoshimura (Tokyo Metropolitan University)

In this paper, we attempted to improve the response of a structural-acoustic coupled system using an Operational Sensitivity Analysis.
An operational stiffness sensitivity analysis is newly proposed and validated through an analysis using a FEM model.
An operational mass sensitivity analysis was also validated experimentally, and these results were compared with those of an Operational Transfer Path Analysis, which is a well-known conventional operational analysis, to demonstrate the usefulness of the sensitivity analysis．

Mass Placement Optimization for Improving Vibration Damping of Automobile Body

Ryo Ageba･Kazuhiko Higai･Tsuyoshi Shiozaki (JFE Steel)

The shift from internal combustion engines to motors in automobiles requires changes in the body structure to maintain vibration damping. The vibration frequency bands generated by the engine and motor differ, so the body needs to correspond to these frequencies. This paper explores using topology optimization to achieve optimal mass arrangement and improve vibration damping in car body design. By placing a mass of around 5 kg in an optimal position, the vibration level at the evaluation point was reduced by over 5 dB.

A Study on Structural Optimization by Varying Plate Thickness to Minimize Vibration Response Energy due to Displacement Excitation using FEM

Katsuhiko Kuroda (Nagasaki Institute of Applied Science)

Currently, there is a trend in the body parts of electric vehicles to reduce the number of parts by one-piece molding. In this paper, the target structure is a beam that connects the left and right joints of the suspension section and the thin plate at its bottom, and the objective function of the structural optimization method is vibration response energy, using a method of inputting moment excitation of base excitation by FEM, and the design variables are composed of grouped plate thicknesses.

Vibration Damping and Weight Reduction Technology for Automotive Doors using Thermoplastic Glass Fiber Composite Materials

Yue Hu (Foster Electric)･Yigen Zuo (TEIJIN)･Manabu Sasajima･Yoshiteru Uchida (Foster Electric)

This research focuses on the inner panels of doors, which are becoming lighter and thinner, and aims to suppress vibration and improve the acoustic quality of speakers by using lightweight and highly rigid fiber-reinforced thermoplastic resin. After confirming the vibration mode shapes that have a high degree of influence, we used topology optimization to examine the shape of the inner panel in order to effectively suppress the modes.