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권성민(Seongmin Kwon),심우정(Woojeong Sim),윤신(Seen Yun),최재홍(Jaehong Choi),박강일(Kang-il Park),이승철(Seungchul Lee),정진태(Jintai Chung) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.4
In this study, the operating noise of a front-door window of a vehicle was studied. The time response and frequency spectrum of this noise were measured through experiments and analyzed. To investigate the mechanism of the operating noise, the sound pressure level and frequency according to the operating state of the door window were analyzed. The noise increased greatly when the window regulator motor was mounted on the module plate. To find the cause of the increase in noise, the operating deflection shape of the door module was measured. It was found that the noise increase was caused by the torsional behavior of the motor exciting the module plate. To reduce this noise, a finite element model of the door module with a window was established, and a method to reduce the vibration was proposed by changing the shape of the module plate.
윤이훈(Yihoon Yoon),고민재(Minjae Go),장우재(Woojae Jang),윤신(Seen Yun),권성민(Seongmin Kwon),박병섭(Byungsup Park),나병수(Byungsoo Na),정진태(Jintai Chung) 한국소음진동공학회 2024 한국소음진동공학회 논문집 Vol.34 No.2
This study identified the noise generation mechanism of a bus drive motor and proposed a design guideline for the motor frame to reduce this noise. By measuring the noise and vibration signals, it was found that the noise was amplified at a specific rotational speed, and a frequency analysis was performed to identify the cause. This analysis confirmed that the vibration of the housing and rear bracket generated by the electromagnetic force in the motor was related to the noise generation. Then, modal testing was performed to obtain the mode shapes and natural frequencies of the housing and rear bracket equal to the noise amplification frequencies. In the mode shapes of the housing, pumping and bending deformations of the lateral surface were observed, while radial asymmetric deformation appeared on the rear bracket. Therefore, ribs were added to the housing and rear bracket to suppress these deformations. Finally, the noise level of the improved motor was measured, which confirmed a reduction of up to 10.7 dB(A) compared to the original motor.