Fundamental Study for 6 DOF Contribution Analysis in Operation Employing Virtual Point

Junji Yoshida･Kenta Hara (Osaka Institute of Technology)

Virtual point is a method for estimating vibration where direct measurement is hard. Blocked force can also be estimated by the method. On the other hand, the method is applicable at a frequency band where the target structure vibrates rigidly. In this study, we considered a combined method of virtual point and operational TPA to estimate the force contribution at wide frequency band. In the method, the blocked force at a virtual point was estimated and the transfer function to the response point was calculated using the blocked force and the vibration in operation.

Breakdown of Elements and Optimization with Model Based Development (MBD)
-To Manage both Environmental Performance and Body Vibration of Cars-

Hidefumi Muranaka･Ryo Takahashi･Toshihiro Hayashi･Daisuke Tsukahara･Kiyofumi Sato･Tatsuya Okuno･Hajime Ooba (SUBARU)

Aiming at the harmony with the global environment, if the catalyst is warmed up early for exhaust gas cleaner, the vibration of the car body gets worse, and we took a lot of person-hours for these performance coexistence in the past. Therefore, about car body vibration during catalyst warm-up, we created physical models of the exciting force and the sensitivity of the vehicle body and verified them with the actual device to analyze factors. In addition, we achieved the optimization of development by constructing the comprehensive MBD from combustion waveforms to vehicle body vibrations.

A Finite Element-Poroelastic Element Direct Frequency Approach to Vibro-Acoustic Simulation in Fully Trimmed Car Models

Willem Van Hal･Kamel Amichi･Massimiliano Calloni (ESI)

Vibro-acoustic simulation in the automotive industry is crucial for enhancing the driving experience in terms of comfort and safety, while also assessing manufacturers in meeting regulatory standards and improving design process efficiency. In the context of cabin noise, it enables engineers to assess and refine interior acoustics during the early stages of vehicle design, facilitating informed decisions about materials, components, and design elements. This paper introduces a finite element - poroelastic element direct frequency approach for cabin noise simulation, leveraging a geometric/hybrid solution that scales efficiently on inexpensive hardware , applied to a fully trimmed car model.

Pressure Pulsation Prediction Model for Control Brake Actuator with Compound Pipeline

Yohei Koike･Masashi Komada (Toyota Motor)･Masahiro Yano･Nobuhiko Yoshioka (Advics)

For a brake system in which the pressure of the left and right wheels is controlled by a single pump in a brake actuator, the actuator model was constructed by identifying the transfer function of valves without mathematical model inside the actuator using the 4 pressures/2 systems method, and together with the transfer function of internal oil channels composed of compound pipeline. The model was validated by measuring the pressure pulsation at the actuator outlet.