수리온 인체진동 영향성 평가

정세운,곽동일,김세희,황유상 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.4

헬리콥터의 진동은 조종사와 승객의 안락함을 결정하는 주요인이며, 점차 높아지는 안락함에 대한 요구 수준에 대응하기 위한 진동저감 관련 연구가 꾸준히 진행되고 있다. 인체진동은 진동에 노출된 조종사와 승객에 대한 안락함과 건강에 미치는 영향을 평가하기 위해 활용되고 있다. 또한, 진동에 노출된 인체에 대한 평가는 인체진동을 향상시키기 위한 연구에 활용하고 있다. 국내 최초로 개발된 수리온 헬리콥터에서도 다양한 진동저감장치가 적용되어 있으며, 국제표준 ISO 2631-1(Mechanical vibration and shock-Evaluation of human exposure to whole body vibration)을 적용하여 수리온에 대한 인체진동 평가를 수행하였다. 본 논문에서는 수리온 진동에 노출된 인체에 대한 평가 방법과 결과를 제시한다. The major factor for pilot and passenger comfortable in cockpit and cabin is vibration of the helicopter, and the research for helicopter vibration reduction is in progress corresponding to the demand for increased comfort level. The human vibration has been used to evaluate comfort and health for pilot and passenger who are exposed to vibration. Also, the evaluation of human exposure to vibration has been used to improve comfort and health with regards of human vibration. For Surion that is first korean-developed helicopter and has appropriate vibration-reduction devices, the evaluation of human vibration was conducted according to ISO 2631-1(Mechanical vibration and shock-Evaluation of human exposure to whole body vibration). This paper presents the evaluation method and results of human exposure to Surion vibration.

승용차량IDLE 진동의 맥놀이 현상에 의한 승차감 저하에 관한 연구

박진한(Jinhan Park),안세진(Sejin Ahn),정의봉(Weuibong Jeong) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4

The beating phenomenon occurs because of various causes, when idle vibration was happened. In this study, the beating phenomenon was divided into several parameters and controlled by the parameter. It was hypothesized that the beating parameter is related to discomfort of idle vibration. The three-down one-up method was performed for evaluating discomfort of controlled vibrations, which is widely used in the field of psychophysics. As a result in the test, subjects respond beating vibration more discomfort than normal idle vibration. More discomfort beating vibration has parameter, Beating frequency is 1, 2Hz or amplitude ratio is big.

인체 진동을 고려한 최적 현가장치의 선정에 관한 비선형 모의실험

김진기,홍동표,최만용 한국소음진동공학회 2000 소음 진동 Vol.10 No.2

The evaluation of the ride quality had been performed by the subjective method before ISO2631(International Organization for Stadard 2631) and BS6841(British Standard 6841) was precented, but many research programs have been performed by the objective method after that. On this study, the ride quality was evaluated related with the objective method which considered the vibration which the human body feels on the driver's seat while driving on the road. In particular, we made the shock absorber nonlinear model and also selected the suitable shock absorber in the part of the vibration which the human body feels into the simulation. The shock absorber of suspension was dealt with 3 cases respectively with the front wheel and rear wheel. The vibration of the car driving on the road can be transferred to the wheel, the suspension, the vehicle body, the seat and the human body. The signal which was gained from the seat(hip) and the floor(foot) of the human body was changed to the vibration signal which the human body felt through using the frequency weighting function. And then the performance of the shock absorber was calculated through the statistic processing.

교통사고 차량 운전자의 인체 진동 평가 기준을 위한 실험적 연구

김종혁(Jonghyuk Kim),한현서(Hyunseo Han),김송희(Songhui Kim),최지훈(Jihun Choi),박하선(Hasun Park) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

교통사고에서 차량 운전자 또는 탑승자의 인지, 지각 영역은 크게 3종류로 나눌 수 있다. 먼저 시각적인 영역에서 어떠한 사물 또는 보행자를 볼 수 있었는지, 그리고 청각적인 영역에서 충격음 또는 경적음을 들을 수 있었는지, 마지막으로 촉각적인 영역에서 충격 또는 진동을 느낄 수 있었는지 여부에 대한 것이다. 차량이 경미하게 충돌하였거나 보행자를 충격하고 도주한 경우, 대개 피의차량 운전자는 경찰 진술 조사에서 사고 사실을 전혀 인지하지 못하여 현장을 이탈하였다고 주장한다. 또한 보험금을 편취할 목적으로 한적한 비포장도로에서 교통사고를 위장한 후에 사고 당시 졸음운전을 해서 사고가 발생한 것이라고 주장하기도 한다. 이와 같은 경우 피의차량 운전자의 거짓 주장에 반박하기 위해서 과연 사고 당시 충격이 운전자가 충분히 인지하기 어려울 정도의 충격이였는지 또는 사고 도로 환경이 과연 운전자의 졸음운전의 가능성을 고려할 만한 도로인지에 대해 정략적인 분석 방법과 평가 방법이 필요하다. 본 연구에서는 도주차량 사고, 졸음운전을 빙자한 위장 사고 등에 대해 피의차량 운전자의 거짓 주장 또는 진술에 반박하기 위한 객관적인 증거 자료를 활용하고자 차량 운전자의 인체 진동 측정 방법과 그 평가 기준에 대해 연구를 수행하였다. ISO2631에서는 인체에 미치는 진동을 측정하고 평가할 수 있는 기준을 다루고 있으며, 본 기준을 토대로 차종별, 노면 상태별, 속도별 진동 특성을 실차 실험을 통해 알아본 결과, 노면의 특성에 따라 차량 운전자의 안락감에 미치는 영향이 달리 나타나는 것을 알 수 있었고, 노면의 굴곡과 편차가 심할수록 진동의 정도(r.m.s.)가 크게 나타남을 알 수 있었다. 또한 과속방지턱을 넘을 경우, 주행 속도가 증가함에 따라 진동의 정도가 점차 증가함을 알 수 있었다. 향후 교통사고 현장 조사에서 비포장 도로 또는 과속방지턱이 차량 운전자에게 미치는 영향을 평가하는데 있어 본 연구에서 수행한 인체 진동 측정 방법과 평가 기준 그리고 실험값들을 활용함으로써 객관적인 평가를 수행할 수 있을 것으로 사료된다.

승용차량 정차시 발생하는 진동에 대한 객관적 인체반응특성과 주관적 불편함평가의 상관성에 관한 연구

이재영(Jaeyoung Lee),전경진(Gyeounjin Jeon),안세진(Sejin Ahn),정의봉(Weuibong Jeong) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4

Thirteen taxi drivers as the subject in the experiment were exposed to vertical vibration which is controlled on a rigid seat reflecting vibration on passenger vehicle. They were employed not only to get human response of objective measurement but also to make subjective evaluation of the vibration. The subjective evaluation was estimated using the absolute discomfort threshold of the controlled vibration, which was achieved with the three-down one-up method that is widely used in the field of psychophysics. As the result, apparent mass and apparent eccentric mass as objective human response tend to gradually decrease when frequency of the vibration increases. The absolute discomfort threshold was increased in case of increasing the frequency. Concludingly, the subjective discomfort evaluation is highly correlated with the objective human responses at the range of idle vibration on passenger vehicle.

인체 진동을 고려한 국내의 대중 교통 수단의 진동환경 평가에 관한연구

김진기,홍동표 한국소음진동공학회 2001 한국소음진동공학회 논문집 Vol.11 No.7

This paper introduces experimental results related to the vibration ride conditions that a korean male subject experienced in the nationwide railway trains and the express bus. Two types of railway train's Saemaulho and Mugunghwaho. and the express bus were chosen to measure how much the whole-body vibrations on the contact area of the back , hip and feet are exposed to the subject. Measured vibration signals were analysed to assess the rife conditions quantitatively and qualitatively. Analysed results are illustrated to unveil how much typical public transportation system in Korea expose whole-body vibration to passengers. Futhermore, the performance evaluation of their seats were carried out to examine their effectiveness in reducing vibration exposure to passengers.

ISO 2631-1을 이용한 국내 고속철도차량의 인체진동 노출량 평가

김지만(Ji Man Kim),박진한(Jin Han Park),안세진(Se Jin Ahn),정의봉(Weui Bong Jeong) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.4

Vibration exposure of domestic high speed trains(KTX and ITX-saemaeulho) to passenger traveling on the Gyung-Bu line was measured to evaluate health effect which is based on ISO 2631-1. The vibration exposure was compared with the frequency weighted root mean square(r.m.s.) and vibration dose value(VDV) of the two trains’ vibration. It is concluded that vibration exposure of the two train during round trip of Busan-Seoul in single day is evaluated to be safe for the passenger’s health according to the health guidance caution defined on ISO 2631-1. Futhermore KTX’s vibration exposure is found to be significantly lower than ITX-saemaeulho thanks to lower vibration magnitude as well as shorter trip time.

승용차량 정차시 발생하는 진동에 대한 객관적 인체반응특성과 주관적 불편함평가의 상관성에 관한 연구

이재영(Lee, Jae-Young),전경진(Jeon, Gyeoung-Jin),안세진(Ahn, Se-Jin),정의봉(Jeong, Weui-Bong) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.5

Thirteen taxi drivers as the subject in the experiment were exposed to vertical vibration which is controlled on a rigid seat reflecting vibration on passenger vehicle. They were employed not only to get human response of objective measurement but also to make subjective evaluation of the vibration. The subjective evaluation was estimated using the absolute discomfort threshold of the controlled vibration, which was achieved with the three-down one-up method that is widely used in the field of psychophysics. As the result, apparent mass and apparent eccentric mass as objective human response tend to gradually decrease when frequency of the vibration increases. The absolute discomfort threshold was increased in case of increasing the frequency. Concludingly, the subjective discomfort evaluation is highly correlated with the objective human responses at the range of idle vibration on passenger vehicle.

동일한 지간을 가진 교량형식별 진동사용성의 해석적 평가 및 비교

박성규 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 논문집 Vol.15 No.1

현재 교량구조물의 진동과 관련된 규정이나 시방지침이 미비한 상태여서 장경간 교량설계시 진동사용성에 대한 검토가 전혀수행되지 않고 있다. 본 연구는 교량의 진동사용성 평가를 위해 Meister진동감각곡선을 이용하여 동일한 지간 및 도로폭을 가진 단경간 형식별 교량에 대해 해석적인 방법으로 평가를 실시하고자 한다. 구조해석 프로그램 MIDAS를 사용하여 각 교량의거더는 프레임 요소로 하고 슬래브는 판요소로 모델링하여 설계 차량의 이동하중을 적용하여 시간이력해석을 수행하였다. 시간이력해석에 의한 처짐 및 가속도 진폭을 Meister의 진동감각곡선을 이용하여 교량형식별 진동사용성을 비교 평가함으로써 장경간 교량의 설계단계에서 진동사용성을 검토할 수 있는 해석적 프로세스를 제시하였고 적절한 방법임을 확인하였다. This study intends to analytically evaluate the vibration serviceability of the bridges for each long-span type having the same span length and road width using the Meister vibration sensation curve. With MIDAS, a structural analysis program, bridges were modeled using the girders as the frame element and slabs as the plate element. The transient analysis was performed using the moving loads of the design vehicles. This study presents the analytical process of reviewing the vibration serviceability during the design of long-span bridges. It involves the comparison of the vibration serviceability of different bridge types by applying the lagging-behind and acceleration amplitude from transient analysis to Meister curve. The result confirms that the process is appropriate.

Study on Uncertainty Factors of Head Vibration Measurements

정완섭(Cheung, Wan-Sup),김영태(Kim, Young-Tae),류제담(Ryu, Je-Dam),홍동표(Hong, Dong-Pyo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.1

This paper addresses uncertainty issues encountered recently in measuring head vibration using the conventional 6-axis or 9-axis bite-bar model. Those conventional bite-bar models are shown to present insufficient information to evaluate a generalized motion of head vibration. In order to overcome such limit, a new theoretical measurement model that consists of four 3-axis linear accelerometers is suggested. It is shown to enable the measurement of three angular acceleration components and six second-order angular velocity-dependent terms. Those nine angular motion-related ones, in addition to the three linear acceleration terms at the origin, are found to make it possible to evaluate the generalized head vibration for a given position. To examine the feasibility of the proposed method, a newly designed 12-axis bite-bar was developed. Detailed experimental results obtained from the developed 12-axis bite-bar are demonstrated in this paper. They illustrate that the popular 6-axis bite-bar model yield about $4.0\%$ relative measurement uncertainty for the pitch component of head vibration, $14\%$ and $10\%$ relative measurement uncertainty for the roll and yaw components of head vibration, respectively. Furthermore, this paper proposes other uncertainty factors to be considered in the future.