A Study on the Cause and Improvement of Hood Rattle
-Cause and Improvement of Hood Rattle-

Eunmin Kim･InSun Baik･HooSang Part･SangIl Lee･JongWook Moon (Hyundai Motor)

Hood rattle of the causes of hood noise, and we are trying to understand the principle of rattle and improve it.

Study of Effective Interior Noise Reduction using Detailed Door Model Analysis Technology Development to Visualize Noise Transfer Flow by HSEA

Norihisa Nakajima･Ichiro Fukumoto (Kasai Kogyo)･Shinichi Kokabu (K and A JPN)

Demanding improvement in cabin quietness is essential to achieve a comfortable interior for electric vehicles (EVs). However, it may lead to an increase in mass, so effective noise reduction is required. In this report, we study effective noise reduction methods by developing a detailed door model to visualize the flow of noise transfer from the vehicle's exterior to the interior.

Control Technology of Car Quality by Driving Sound: Evaluation of Car Quality using Sound Texture Models

Yuki Nakatani･Tetsunori Hada･Naoko Yorozu･Takaya Katsuragawa･Masayuki Watanabe (Mazda)

We constructed a car quality evaluation model using sound texture statistics which are amplitude modulation features, based on auditory functions. We tested this model on driving sounds measured at constant speeds, and found that it evaluated the quality of a car more accurately than conventional psychoacoustic features.

Control Technology of Car Quality by Driving Sound: Improved by Controlling the Modulation Transfer Characteristics of the Vehicle Body

Tetsunori Hada･Yuki Nakatani･Naoko Yorozu (Mazda)

It is critical to develop an amplitude modulation control technology that supports the car quality evaluation model suggested in previous presentation. We found that modulation transfer characteristics of radiation and transmission sound through the vehicle body, could be explained by the modulation transfer function used as an index of speech intelligibility. Furthermore, we also found that car quality could be improved by controlling the modulation transfer characteristics of the vehicle body.

Analysis of Disc-Brake Squeal Considering Lining Wear (Part 2)

Tokunosuke Ikegami･Katsuhiro Uchiyama･Yoshiyuki Yamaguchi (Nisshinbo Brake)

In our previous report, we conducted brake squeal analysis (complex eigenvalue analysis) considering the lining wear, and we showed visualization of wear pattern and good correlation with experimental results for both wear pattern and squeal. In this report, we perform parametric study of brake pad and propose countermeasure against out-of-plane brake squeal and in-plane brake squeal.