Vibration Measurement with Images of Automobile Engine and Body using Compressed Sensing and Order Analysis

Yuki Kato (Kochi University of Technology)･Soma Watahiki (Kozo Keikaku Engineering)･Masayoshi Otaka (Ono Sokki)

Measurement of automobile engine and body vibration has been widely conducted for the purpose of vibration control design. In this study, a low-cost/high-resolution visualization measurement method for high-speed vibration was developed by applying "compressive sensing", "digital image correlation" and "order analysis" to images captured by a high-resolution low-speed camera using a random strobe flash.

Development of Low Vibration Crankshaft in Outboard Motor Equipped with New V8 Type Engine

Kentaro Takanishi (Honda Motor)･Tatsuya Kuroda･Takashi Kondo (Honda R&D)･Gaku Naoe (Honda Motor)

Developed the flagship model BF350, a large outboard motor equipped with a whole new V8 engine. Under the width restriction of outboard motors, it is common to adopt a bank angle of 60 degrees. However, the vibration caused by primary inertial couple force has been remained as a problem to be solved. In this paper, we have developed the crankshaft that does not generate primary inertial couple force by optimizing the crank pin arrangement without additional parts such as dynamic balancer, and low vibration performance has been achieved.

Characteristic Analysis of Power Plant Eigenmodes Deteriorating the Sound Quality of Engine Combustion Noise

Keizo Konishi (Honda R&D)･Kenji Torii･Chihiro Nishikawa (Honda Motor)

The authors have previously established a method for obtaining an intermediate index of structural transfer characteristics from vibration experiments on power plants to enhance the sound quality of combustion noise. This paper reports on the analysis of the characteristics of power plant vibration modes that affect the increase of half-order and odd-order components of combustion noise, using the above index and experimental modal analysis on a four-cylinder engine.

A Method for Calculating Power Plant Transfer Functions for Enhancing Engine Sound Quality

Chihiro Nishikawa･Kenji Torii (Honda Motor)･Keizo Konishi (Honda R&D)･Hideto Tamaki (AutoTechnic Japan)･Ryo Yamaguchi (Honda Motor)

The authors developed order-based frequency response functions (FRFs) as an intermediate index of transfer characteristics obtained from operational data to enhance sound quality of combustion noise, and established a method to obtain a similar index from a stationary power plant. This paper reports on the development of order-based FRFs calculation method using the finite element model of a power plant based on experimental results.

Guidelines for Structural Design to Realize Power Plant Eigenmodes that Enhance Engine Sound Quality

Kenji Torii (Honda Motor)･Keizo Konishi (Honda R&D)･Chihiro Nishikawa (Honda Motor)･Hideto Tamaki (Auto Technic Japan)･Yuichi Matsumura (Gifu University)･Takuya Yoshimura (Tokyo Metropolitan University)

The authors are studying basic power plant structural design guidelines to enhance engine sound quality effectively. In an in-line 4-cylinder engine, it is important not to increase the half-order and odd-order components of engine vibrations at the resonant frequency of power plant. In this presentation, control conditions of vibration mode vectors for this purpose will be presented.