A study of combustion-induced vibration in a single-cylinder diesel engine through modal analysis and dynamic behavior analysis

Daichi Yamane･Karin Aoyagi･Masato Mikami (Graduate School of Sciences and Technology for Innovation, Yamaguchi University)

In engines, the combustion impact transmits through each component, decays and finally radiates as noise from the outer surface. We focused on the internal transmission path of the combustion-induced vibration via the piston, connecting-rod and crank shaft and conducted a modal analysis and dynamic behavior analysis. From these results, we discussed frequency characteristics of vibration acceleration result obtained by measuring a single-cylinder diesel engine.

Mode Vector Control of Powerplant Eigenmodes Using Concentrated Masses for Engine Sound Quality Enhancement

Keizo Konishi (Honda R&D)･Kenji Torii (Honda Motor)･Hideto Tamaki (Auto Technic Japan Co., Ltd.)

In our previous study, we proposed structural design guidelines for improving power plant eigenmodes with the aim of efficiently enhancing the sound quality of engine combustion noise. This paper investigates structural configurations that satisfy those guidelines. Specifically, we report the results of evaluating a simplified structural model simulating a power plant, in which the nodal positions of its eigenmodes were adjusted to develop a structure that enhances sound quality.

The Improvement of NVH Evaluation Method through The Development of Simulation Technology to Realize The Vibration Effect of A Power Plant Suspended by Mounts on 3-axis Transmission Test Bench

Shoichi Ishigaki･Hajime Fujimura･Hiroshi Sho･Hiroaki Sumitomo･Hiroki Kuwamoto (Toyota Motor)

The evaluation of a transmission, such as NVH (Noise, Vibration, Harshness), is conducted on a 3-axis test bench before vehicle testing. However, since the transmission is fixed due to the bench structure, the test cannot be conducted with the vibration effects of a power plant suspended by the mounts on the bench. As a solution, we developed the control technology that simulates the vibration effects of the suspended power plant using a model, thereby realizing the effect on the bench.

Simplified Method to Create Vehicle Sound Model for Road Traffic Noise Prediction

Ayumu Yanagibayashi (Kanagawa University Graduate School)･Yoshihiro Shirahashi･Kai Kurihara (Kanagawa University)･Hiroyuki Houzu (NALTEC)･Toru Yamazaki (Kanagawa University)

Prediction of road traffic noise requires a noise model for each vehicle with different noise regulation. In this study, we proposed a method to construct a noise model based on noise regulation values for each regulation category, and validated the road traffic noise LAeq estimation.