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도심교통소음의 노출시간에 따른 라우드니스 및 어노이언스의 주관적 반응에 대한 연구
허덕재(Hur, Deog-Jae),조경숙(Jo, Kyoung-Sook),최병호(Choe, Byong-Ho) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.3
A study has been conducted to investigate the subjective responses of loudness and annoyance according to the exposed time of urban traffic noise in controlled laboratory environment. To make a closer inspection into psychological response relevant to noise characteristics while varying the time of exposure to noise, the subjects were presented a set of noises with different exposed time and requested to judge spontaneously on a 100-unipolar scale. To be concrete, the subjects were exposed to noises being varied in time from 15 sec up to max. 1,200 sec for the controlled traffic noise sources. So far achieved from laborious tests, it has an importance being on the logarithmic relations of perceived loudness and exposed time, say, it is more increased the perceived loudness in the sorter exposed time than in the longer exposed time. However, the trend is said to be not effective for the case of annoyance. On the other hand, the subjective impressions on relative annoyance of noise is shown to be correlated with the noise characteristics such as loudness (sones), tonality and time with logarithmic scale, the product correlation moment being calculated as $R^{2}=0.99$. The variances to be explained for annoyance assessments through varying the time of exposure were ranged between 30 % and 50% for the exposed time, $27{\sim}37%$ for tonality, and $34{\sim}20%$ for loudness, respectively With these results, hopefully, it can be helpful for those who want to work out an experimental design for evaluating an environmental noise or to quantify any psychological dimensions found in annoyance assessments.
CAE를 이용한 대형 상용차 배기계의 구조적 특성에 관한 연구
허덕재(Deog-Jae Hur),김병곤(Byoung-Gon Kim),최석환(Seok-Hwan Choi) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. a CAE techinique is developed in order to identify and optimize the characteristics of a heavy truck exhaust system. Under the given three loading conditions. the strength is investigated through static stress analysis along with parameter optimization. The dynamic performance is also evaluated by modal analysis. For the simplification and idealization of bellows in F. E. model. three ways of modeling techique are attempted and the results are compared.<br/>
수평 착자형 액추에이터의 전자기력 성능 향상에 관한 연구
허덕재(Deog Jae Hur),이재혁(Jai Hyuk Lee),권상엽(Sang Youp Kwon),이성수(Sung Su Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
This paper describes optimization design to improve the performance of bandwidth and the maximum acceleration of the linear AC vibrator with horizontal magnetization. The variable was set the electromagnetic force of the exciting force of the haptic vibrator. Optimization in horizontal magnetization design leads the maximum electromagnetic force when the permanent magnet and coil are centrally aligned. In addition, when increasing the width and height of magnet, the electromagnetic force has increased also. The final optimized design is applied with the parameter combination, and the electromagnetic force has risen about 81.4% compared to the previous model.
[응용논문] OTPA 방법을 이용한 롱레일이 적용된 차량용 시트의 구동소음 기여도 분석 연구
정재덕(Jae-Deok Jung),고동신(Dong-Shin Ko),허덕재(Deog-Jae Hur),이원기(Won-Gi Lee) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.4
Indoor noise of a vehicle is becoming more important as indoor space increases due to the electrification of vehicles and autonomous driving. In order to utilize the wider indoor space, a vehicle seat with long-rail is required. A noise evaluation of the longer structure and increased operating speed is required. In this paper, OTPA was used to evaluate noise contribution. Responses were measured by accelerometers and microphone at points determined as noise points, and the contribution of each noise source was analyzed by using the SVD and PCA methods. In addition, sound pressure was measured directly at the headrest position and compared with the value calculated via response synthesis in order to increase the reliability of signal processing. The contribution of the structure-borne noise was greater than the motor noise, and the contribution of the lower rail was the highest. Furthermore, it was confirmed that the main frequency for noise contribution was 400 Hz.
정재덕(Jae-Deok Jung),고동신(Dong Shin Ko),허덕재(Deog Jae Hur),이원기(Won Gi Lee) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
차량의 전동화로 인해 실내공간이 확장되고 이를 활용하기 위한 차량용 시트의 연구개발이 진행되고 있다. 기존 레일에 비해 3~4배 긴 레일을 설치하여 앞뒤의 이동 자유도를 높일 수 있다. 길어진 레일로 인해 강성이 낮아지고 구동 속도가 증가함에 따라 진동과 소음이 상대적으로 증가하게 된다. 진동 기여도 분석은 OTPA(Operational Transfer Path Analysis)를 사용하여 분석을 진행하였다. OTPA는 PCA와 SVD 과정을 거쳐 구동 중 여러 전달경로에 대한 기여도를 한 번에 도출한다. 또한 전통적인 방법과 달리 소음원 분리에 의한 경계 조건이 변하지 않는 장점을 갖는다. 센서 부착위치는 Photo.1과 같으며 S7위치의 가속도계를 대상(target)으로 설정하였으며 시트가 전진방향으로 구동할 때 각 부위의 기여도를 분석하였다. 시트 소음기여도 분석은 OTPA 분석 절차를 프로그램화 하여 데이터 처리를 수행하였다. S7의 앞뒤방향(x방향)에 대한 각 전달 경로 별 기여도 결과는 Photo.2와 같고 주파수에 따른 전체 진동레벨(overall)을 RMS로 나타내었다. S7의 앞뒤방향에 대한 기여도를 순위별로 나열하면 U2, W3, U1 순으로 나타나 어퍼레일과 스위블의 영향이 가장 지배적인 것으로 나타났다. 특히 어퍼레일의 경우 좌우방향(y방향) 진동에 의한 기여도가 가장 크게 나타났으며 스위블의 경우 위아래방향(z방향)의 기여도가 크게 나타남을 확인하였다.
황대선(Dae-Sun Hwang),허덕재(Deog-Jae Hur),황효성(Hyo-Sung Hwang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Here are the basic concept, components of conventional transfer path analysis (TPA) methods using data of the frequency domain and the comparison of direct and indirect methods quantifying noise sources. The differences of the time domain TPA & frequency domain TPA are showed and the convolution calculation algorithm for the process of the time domain TPA is observed. The algorithm is classified into two methods. One is the method which uses only the time data and the other is the method which uses the time & frequency data. And the former is also classified into two methods. One is a view-point of input data and the other is a view-point of output data. The latter uses algorithms of the FFT convolution and overlap-add method.