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김성육(Sung-Yuk Kim),오종석(Jong-Seok Oh),김기선(Key-Sun Kim) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.3
In this study, we analyzed the image characteristics of vehicle type and the operating sound quality by jury testing the operating noise of the power seat slide adjuster for the vehicle. First, the operating noise for five test power seats was measured and adjectives for subjective sound quality evaluation were extracted through questionnaires. Next, the images according to vehicle type were examined using the extracted adjectives. Third, a subjective evaluation of sound quality was performed using a loud speaker. At this time, the sound quality and the sound image of the operating noise were extracted by examining the preference, adjective score using the semantic differential, and vehicle matching the sound source. Thus, it was possible to suggest sound quality characteristics of slide operating noise and improvements in sound quality according to vehicle type.
김성육(Sung-Yuk Kim),이정빈(Jung-Bin Lee),김기선(Key-Sun Kim) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
This study analyzed the load change of the gear generated by the operation of the vehicle recliner through Finite Element Analysis. The basic model of the recliner used was a commercial product, and the effect of the seat frame was excluded. The load conditions applied to the recliner were set considering gravity, the mass of the seat"s back frame, and the weight of a person. The operating mode was set to move the seat back from the vertical to the reclined position. As a result, it was found that the tooth bending amount of the gear rim and wheel increased from the cam rotation angle of 450 degrees, and a change in the contact ratio occurred. Furthermore, excessive torque fluctuations occurred in the ranges of 390 to 450 and 750 to 710 degrees. It was found that this occurred in the region of about 30 degrees before and after the point where the x-axis direction load is larger than the y-direction load. From this torque fluctuation it was determined to likely to cause chattering noise.
차량용 파워 시트 작동음의 감성 어휘 추출 및 주관적 음질 평가에 관한 연구
김성육(Sung-Yuk Kim),장주광(Ju-Gwang Jang),지효성(Hyo-Seong Ji),김옥환(Ok-Whan-Kim),김기선(Key-Sun Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.2
In this study, emotional adjectives about the operating sound quality of the vehicle power seat are constructed, and the effectiveness of the emotional adjectives are verified by evaluating the operating sound quality. First, emotional adjectives were collected from the literature related to the automobile field and other sound qualities. A questionnaire was made using these adjectives. The questionnaire was designed to be able to select all adjectives that could express the operating noise of the power seat slide adjuster by applying the multiple- response method. Next, a subjective sound quality evaluation was conducted using the emotional adjectives. In the evaluation, we first recorded the operating noise for two power seats. Second, the subjective sound quality evaluation was performed on the recorded operating noise using a loudspeaker. Finally, through a statistical analysis on the sound quality evaluation results, the relationship between the semantic space and the preference score was verified, and the validity of the emotional adjectives was verified.
유한요소해석을 이용한 차량용 파워 시트 리클라이너의 방사 소음에 관한 연구
김성육(Sung-Yuk Kim),김기선(Key-Sun Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
In this study, the analysis of radiation noise and chattering noise of vehicle seat recliner was conducted through testing and analysis. First, operating noise was measured by seat back frame and recliner, and chattering noise was confirmed. Next, the transient dynamic analysis was performed, and the result was mapped to the acoustic analysis. Finally, the test and analysis were compared and analyzed. The results are as follow. First, it was found that the peaks appeared in common in the range of 620~650 ㎐, 1,240~1,290 ㎐, and 1,840~1,940 ㎐. It was judged that the dynamic characteristics of the recliner system overlapped with the rotation component of the motor to cause amplification of noise and vibration. Next, as a result of imaging the radiation noise analysis, it was judged that the noise radiated in the forward and backward direction has a greater influence than the direction of the rotation axis when the ear position of the person is taken as a reference.
피험자 체형에 따른 자동차 시트 쿠션의 체압분포 특성과 안락감
지효성(Hyo-Seong Ji),김성육(Sung-Yuk Kim),전용두(Yong-Du Jun) 한국자동차공학회 2020 한국자동차공학회 지부 학술대회 논문집 Vol.2020 No.6
Automotive seat comfort has been considered as one of the most important issues in automotive seat industry, because the seat is directly related to human feelings, activities, and safety. Recent interest in the design of comfortable seat requires the robustness of comfort level depending on the occupant characteristics. In the present study, we attempt to investigate how the occupants body type affect the pressure distribution characteristics and the perceived comfort level. Pressure distribution is especially import in this regards, because the data comes out of the interaction between the occupant subject and the tested seat. For the present study, both objective physical parameter evaluation and the subjective tests are conducted for a selected 49 subjects and the results are discussed. Subjects are further grouped based on their weight and height to segregate the body-type. Five pressure related physical parameters, that is, mean pressure, contact area, maximum pressure, minimum pressure, and seat pressure distribution(SPD) are considerd for the discussion with the selected comfort query, ’hip and thigh comfort’. Through the present study, robust comfort design could be identified successfully by considering the subject body type as an additional influencing parameter on top of the overall subjective test. According to the present study results, body-type of ’light & short(group I)’ showed least sensitivity, while ’light & tall(group II) showed most sensitivity in the seat comfort evaluation.
고장력 소재로 롤-포밍 공법에 의한 자동차 도어 사이드 임팩트 빔 개발
손희진(Hee-Jin Son),김성육(Sung-Yuk Kim),오범석(Beom-Seok Oh),김기선(Key-Sun Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.6
The purpose of this study is to produce a side impact beam with high tensile steel using a roll forming process. The door side impact beam plays an important roll in a car because it protects passengers from external crash. The roll forming process is a continuous bending process wherein a long metal sheet is bended as it continuously passes several rolls. The characteristic of this study is that an impact beam is produced by a continuous process using a ultra high strength steel without a hardening heat treatment. A model was determined by analysing plasticity of a cross section shape considering high strength. Design parameters of the impact beam was determined by crash-analysing the model. Workpiece products were manufactured by designing dies for roll forming and setting them up in a following process line. Results of a bending test and a FEM analysis was considered and reviewed.
정경훈(Kyung-Hoon Jeong),김성육(Sung-Yuk Kim),윤철진(Chul-Jin Yoon),류누리(Nu-Ri Ryu) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
With the arrival of the fourth industry, the importance of processing precision and work efficiency of components is emphasized. Machine tools are being accelerated to improve processing performance and productivity. Smart magnetic chuck can hold workpieces without jigs and vise. The workpiece can be fixed with a single current injection. Chips generated during component processing remain on the surface due to leakage magnetic force, which can cause damage to products such as scratches and reduced holding power to the processed parts. Natural frequency analysis of smart magnetic chuck developed by supplementing the shortcomings of existing magnetic chuck was performed.