하중을 받고 회전하는 승용차 타이어의 반경방향 고규진동수 측정에 관한 실험적 연구

김병삼,홍동표,지창헌,Kim, Byoung-Sam,Hong, Dong-Pyo,Chi, Chang-Heon 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.1

The measurement of radial directional natural frequency ina passenger car tire rotating under the load is studied. In order to obtain theoretical matural frequency and mode shape, the ploane vibration of a tire is modeled to that of circular beam. By esing the Tieking method based on Hamiltons's principle, theoretical results are determined by considering tension horce due to tire inflation pressure, retational velocity and tangential, radial stiffness. Radial directional modal parameters varying with the inflation pressure, load, rotational velocity are experimentally determined by using frequency response function method. The results show that experimental conditions canbe considered as the parameters which shift the natural frequency.

타이어 트레드의 진동에 의한 음향방사

김병삼,홍동표,정태진,Kim, Byoung-Sam,Hong, Dong-Pyo,Chung, Tae-Jin 한국음향학회 1994 韓國音響學會誌 Vol.13 No.2

회전하는 타이어의 표면진동에 의한 소음방사의 이론적인 모델에 대하여 연구하였다. 타이어를 원형링으로 가정하였고 정규주파수와 구조적인 손실계수를 고려하였다. 타이어 전표면에 대한 음압의 수치적분을 통하여, 타이어로부터 방사되는 음향파워를 계산하였다. 가진주파수와 손실계수를 고려한 계산 결과로부터 타이어 트레드 진동에 의한 음향방사를 감소시키기 위한 조건을 구하고자 하였다. A theoretical model is studied to describe the sound radiation by the surface vibration of in-service tires. The tire is modeled as a circular ring model. The effects of normalized frequency and structrual loss factor are included. Through numerical integration of the sound pressure, the radiated sound power is calculated as a fuction of normalized frequency and structural loss factor. The basic sound radiation mechanism is shown to be the damped progressive wave field on the structure in the vicinity of the applied force. The results indicate that the potential sound reduction might be obtained if values of normalized frequency and structural loss factor are investigated.

Pt / super acid 촉매상에서 디젤 매연의 접촉연소반응

김병삼,김기석 ( Byoung Sam Kim,Ki Seok Kim ) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.2

음장의 공간적 변환기법을 이용한 타이어 구조 진동 소음 측정

김병삼,Kim, Byoung-Sam 한국음향학회 1995 韓國音響學會誌 Vol.14 No.5

본 논문에서는 불규칙한 노면이 설치된 섀시 동력계(chassis dynamometer)로 부터 가진된 타이어의 구조 진동 소음을 음장의 공간적 변환기법을 이용하여 측정하였다. 음장의 공간적 변환기법은 소음원으로 부터 원거리까지의 전파를 계산하는 기법이다. 즉, 한평면의 음향 측정으로 부터 측정 평면에서 멀리 떨어지거나 더 가까운 평면에서의 음장을 표현하는 변수들인 음압, 음향 인텐시티, 입자속도 등을 계산한다. 측정 평면에서 음원쪽으로 가까운 평면의 계산은 관접음장 홀로그래피를 적용하여 계산하고 먼 쪽은 헬름흘쓰 적분식을 적용한다 측정결과로 부터 타이어 구조 진동 소음의 방사형태와 소음원의 위치를 예측하였다. The Interaction between tire and road is responsible for the excited vibration of the tire, and It is also important for the sound radiation. In this paper. measurement of tire structural vibration noise from a chassis dynamometer using Spatial Transformation of Sound Field(STSF) technique is studied. STSF involving a scan that uses an array of transducers over a planar surface close to the source is under investigation. From cross spectra measurement during the scan, a principal component representing the sound field is extracted. Any power descriptor of the near field can then be investigated by means of near-field acoustic holography, while the distant field can be determined by application of Helmholtz integral equation. The results of the measurement were used to obtain the radiation sound pattern from the center line of the tire, and to locate the radiation sound generating regions in the vicinity of the tire.

타이어의 진동특성에 관한 실험적 연구

김병삼 ( Byoung-sam Kim ),장일도 ( Il-do Chang ),지창헌 ( Chang-heon Chi ) 한국환경기술학회 2006 한국환경기술학회지 Vol.7 No.2

차량 제조기술의 급격한 발전과 환경문제에 대한 관심의 고조로 인하여 승차감과 정숙성이 차량의 성능 평가에 중요한 요소로 등장하고 있다. 따라서 차량 주행시 발생하는 진동과 소음현상에 대한 연구가 증가하고 있으며, 이러한 현상을 평가하기 위한 측정방법과 해석기술도 활발히 개발되고 있다. 본 연구에서는 주파수 응답함수법을 이용하여 현가장치가 부착되지 않은 타이어의 고유진동수와 감쇠비를 실험적인 방법으로 측정하였다. 구속받지 않는 실험조건 하에서 여러 가지 타이어(승용차에서 트럭 버스 타이어까지)의 반경방향 고유진동수와 감쇠비을 측정하였다. 타이어의 반경방향 모달 파라메타는 타이어 내부 공기압에 따라 변하였다. 내부 공기압, 타이어에 가해지는 하중 등 실험조건의 변화에 따라 고유진동수와 감쇠비는 변하였다. Natural frequencies and damping ratio of tire without suspension are investigated using frequency response function method. In this paper, we have reported natural frequencies and damping ratios in the radial direction of various tires, from PCR(passenger car radial) tires to truck bus tires, under unconstrained condition. We have determined the radial directional modal parameters of tires, which are subjected to different levels of inflation pressure, by using frequency response function method. The results show that experimental conditions shift the natural frequency and damping ratio.

자동차 섀시 설계를 위한 자동차 타이어 도로소음에 관한 실험적 연구

김병삼(Kim, Byoung-sam) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.4

The purpose of this study is to obtain a foundation data for chassis design and road noise reduction of automobiles. Using the combination of the automobile, radial tires and instrumentation equipment, experimental investigation were carried out to examine the characteristics of the structural vibration of tire as the key to obtaining the effective parameters for reducing road noise. From the results of experimental studies it has been confirmed that the existence of important frequency ranges, which were attributable to the suspension and chassis system. The tire, axle and chassis natural frequency of automobile govern the road noise. Results that material property of tire and experimental condition are parameter for shifting of tire natural frequency, which enables a designer of an automobile to foresee the influence of the various design factors on the road noise.

덕트 시스템 소음 예측 진단 소프트웨어 개발

김병삼(Byoung-Sam Kim) 한국환경관리학회 1998 環境管理學會誌 Vol.4 No.2

컴팩트 디스크 플레이어 고무 댐퍼의 전달율

김병삼(Byoung-Sam Kim),이태근(Tae-Keun Lee) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10

The vibration and disturbances from operating the compact disk layer have an effect on the playability. As the excitation sources of the compact disk player, there are the vibration of the motors and gears, impact by mechanical parts and the external excitations. So, most of the compact disk player have a anti-vibrational system, which is included some rubber or oil dampers. In this study, we investigated the vibration characteristics of rubber damper which is used home compact disk player. We changed the materials and shape of rubber damper, and measured the transmissibility. As a conclusion, the natural frequency is moved to higher frequency and the transmissibility is reduced by the increasing rubber stiffness. In comparison to butyl rubber damper, the transmissibility of silicon damper was increased by larger restitution elasticity. The hollow damper was effective to reduced the transmissibility.

전라북도 주요 도시의 환경소음 저감을 위한 실태 조사

김병삼 ( Byoung-sam Kim ),장원창 ( Won-chang Chang ),김향우 ( Hyang-woo Kim ),박진규 ( Jin-gue Park ) 한국환경기술학회 2005 한국환경기술학회지 Vol.6 No.2

소음에 의한 환경오염은 대부분의 나라에서에서 생활의 질을 해치는 환경오염원 중 하나로 인식될 뿐 아니라 새로운 사회적 문제로 대두되고 있다. 이러한 환경소음의 저감을 위해서는 먼저 환경소음을 측정하고 현재 환경소음의 수준을 파악해야한다. 따라서, 이 연구에서는 전라북도 주요 도시를 중심으로 환경소음의 저감하기 위한 실태 조사를 실시하였다. 환경소음 실태조사를 위한 측정지점을 주거지역, 준주거지역, 상업지역, 공업지역 등으로 구분하였으며, 주간, 야간 시간대에 소음진동 공정시험법에 제시한 공정시험법에 준하여 측정하였다. The environmental pollution by noise is recognized by the pollution source made it not only to carry out harm of the quality of a life of people seriously in most countries, but was generated for most actual problems. The measure to such environmental noise must conduct first investigation which noise generating currently regarded as questionable says in what grade has resulted and the suitable measure by that is studied. The concern of the residents who demand such a comfortable living environment is increasing rapidly. Therefore, the 3 areas of Jeollabuk-Do judged that noise is comparatively severe was selected. It is going to grasp delicately the noise actual condition of a residential, semi-residential, commercial, industrial area.

자동차용 알루미늄 합금 휠의 진동특성에 관한 실험적 연구

김병삼(Byoung-Sam Kim),김기전(Gi-jeon Kim),이태근(Tae-Keun Lee),이규철(Gyu-Cheol Lee) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5

The styling of automobile wheels and their effect on vehicle appearance has increased in importance in recent years. The wheel designer has been given the task of insuring that a wheel design meets its engineering objectives without affecting the styling theme. The wheel and tire system is considered as a vehicle component whose dynamic modal information of the tire/wheel system are employed in the modal synthesis model of the vehicle. The Vibration characteristics of a passenger car wheel play an important role to judge a ride comfortability and quality for a passenger car. In this paper, the vibration characteristics of a AI-alloy and steel wheel for passenger car are studied. Natural frequency, damping and mode shape are determined experimentally by frequency response function method. Results show that wheel material property, size and design are parameter for shift of natural frequency and damping.<br/>