Consideration for High-Accuracy 6-DOF Vibration Contribution Analysis Method utilizing Operational TPA and Virtual Point Transformation

Koki Fujimaki･Kenta Hara･Junji Yoshida (Osaka Institute of Technology)

In this study, we considered 6-DOF contribution separation analysis method from the excitation source, where direct measurement is difficult, to the response point by combining Virtual Point Transformation (VPT) and operational TPA. In addition, we attempted to improve the accuracy of contribution separation by the modification of the VPT matrix. The method was applied to a simplified vehicle model and the accuracy was verified.

EXTRACTION OF HIGH CONTRIBUTING ACOUSTIC MODES OF VEHICLE LUGGAGE COMPARTMENT AND RESPONSE LEVEL ESTIMATION UTILIZING OPERATIONAL TPA-CAE COMBINED PROCEDURE

Junji Yoshida･Masato Nakamura (Osaka Institute of Technology)･Norihisa Nakajima･Ichiro Fukumoto (Kasai Kogyo)

In this study, a method for obtaining high contributing acoustic mode in a vehicle luggage compartment model to the response sound pressure at the rear seat position was proposed by combining CAE eigenvalue analysis and OTPA principal component model. In addition, a response point SPL estimation procedure after the luggage space modification was also considered by introducing principal CAE acoustic mode response into the TPA model at around the target frequency band.

Study on Health Monitoring of Road Infrastructure Using Tires Mounted with Microphones

Hiroshi Tani･Renguo Lu･Shinji Koganezawa (Kansai University)

We investigated a method for monitoring road surface conditions—such as surface roughness and unevenness—and the structural integrity of bridge decks, including their state of deterioration, using tires equipped with microphones. The results indicated that this method has the potential to detect surface roughness, unevenness, and the extent of bridge deterioration.

Measurement of Instantaneous Structural Intensity in Shell Structures Based on Moving Least Squares

Hironori Yamada (SUBARU)･Keisuke Abe (University of Michigan/North American SUBARU)･Toru Yamazaki (Kanagawa University)

A measurement method for instantaneous structural intensity in shell structures was developed to visualize the active component of vibrational energy flow during transient wave propagation. Vibration velocities measured at multiple points using a scanning laser Doppler vibrometer were processed using moving least squares (MLS) to reconstruct the displacement field and its spatial derivatives on the shell surface. The instantaneous structural intensity was then evaluated from the reconstructed field. The proposed method was validated by comparing experimental with FEM.