고무마운트와 동일한 형상 조건을 갖는 압전마운트의 진동저감 성능에 대한 실험적 비교 고찰

한영민 중소기업융합학회 2021 융합정보논문지 Vol.11 No.11

본 연구에서는 기존 고무마운트와 동일한 외부 형상을 갖는 능동마운트를 고안하고 진동절연 성능을 실험 적으로 고찰하고자 한다. 압전작동기를 특징으로 하는 제안된 능동 마운트는 고성능 선박이나 자동차에서 사용되 는 기계장치들의 진동을 절연하기 위해 적용될 수 있으며, 고무요소와 함께 구성되어 하이브리드 구조를 갖고 있 다. 먼저 수동형 고무마운트의 동적 특성을 실험적으로 고찰하였으며, 고무마운트의 형상에 기초하여 능동형 마운 트을 위한 고무요소가 제작되었고 2개의 스택형 압전작동기와 직렬로 연결함으로써 관성형 작동메커니즘을 구성 하였다. 본 연구에서는 진동을 절연하기 위해 단순하면서도 현장 적용이 용이한 PID 제어기가 구성되어 비공진 고주파수 대역의 진동을 절연하기 위한 제어 실험에 적용되었다. 마지막으로 넓은 주파수 영역에서 진동제어 성능 을 실험적으로 고찰하고 기존 고무마운트와 진동 절연 성능를 비교 평가하였다. An active mount is devised in same geometric constraints with a conventional rubber mount. The proposed mount features the piezoelectric actuator which can be used to reduce the vibration at marine vessels or automotive vehicles. As a first step, a passive rubber mount is adopted and its dynamic characteristics are experimentally evaluated. Based on the geometry of the rubber mount, a rubber element for the active mount is manufactured and integrated with two piezostacks in series, in which the piezostack is operated as an inertial type of actuator. A conventional PID controller featured by the simple and easy implementation, is then designed to attenuate the non-resonant high frequency vibration transmitted from the base excitation. Finally, the control performances of a proposed active mount are evaluated in the wide frequency range and compared with those of the conventional rubber mount.

방진고무의 민감도 해석 및 최적설계

나정민(Jung-Min Na),박창현(Chang-Hyun Park),이상민(Sang-Min Lee),최동훈(Dong-Hoon Choi) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Rubber mount is widely used to reduce vibration of machine or structure. Especially, rubber mount is an important component to reduce vibration due to engine, cooling fan and compressor in vehicles. This paper studies optimal design of rubber mount to reduce stiffness. Maximum stress of rubber mount must be smaller than allowable stress. And design variables are selected to describe the shape of rubber mount. It is shown that stiffness of rubber mount can be reduced by redesigning the shape of rubber mount.

비선형 특성을 적용한 파워트레인 마운팅 시스템의 마운트 전달력 해석

김진훈(J. H. Kim),이수종(S. J. Lee),이우현(W. H. Lee),김정렬(J. R. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-

The primary objective of this study is to truly understand reaction force be due to engine exciting force. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand reaction force was applied MSC.Nastran software. Analyzed frequency response analysis of powertrain mount system. First, engine exciting force was applied field function. Also nonlinear characteristics was applied field function : such as dynamic spring constant and loss factor. And nonlinear characteristics was applied CBUSH. Generally characteristics of rubber mount is constant frequency. But characteristics of hydraulic mount depend to frequency. Therefore nonlinear characteristics was applied. Powertrain mounting system be influenced by powertrain specification, mount position, mount angle and mount characteristics etc. In this study, we was analyzed effects of powertrain mounting system. And we was varied dynamics spring constant and loss factor of mounts.

주파수 응답 함수 합성법을 이용한 트랙터 캐빈 마운트 동강성 측정

강민우 ( Min-woo Kang ),한현우 ( Hyun-woo Han ),조승제 ( Seung-je Cho ),박영준 ( Young-jun Park ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.1

트랙터 캐빈 마운트는 캐빈의 하중을 지지하고 차체로부터 전달되는 진동을 절연하는 역할을 한다. 또한, 캐빈 마운트는 캐빈을 지지할 수 있는 충분한 강성을 확보하는 동시에 차체와 캐빈의 적절한 상대 변위를 만들어낼 수 있을 정도의 강성이 요구된다. 따라서, 마운트의 동강성은 마운트의 성능에 큰 영향을 미치는 요소로 이에 대한 정확한 정보가 필요하다. 기존의 동강성 측정법은 유압가진 시험기를 이용하여 직접적 또는 간접적 방법을 통해 마운트 전달 강성(transfer stiffness)을 측정하는 방식이다. 하지만 기존의 시험법은 회전 방향에 대한 강성 측정이 어렵다는 한계가 있다. 본 연구에서는 회전방향을 포함한 마운트 6자유도에 대한 동강성을 측정할 수 있는 주파수 응답 함수 합성법을 이용하여 고무마운트의 동강성을 측정하였다. 주파수 응답 함수 합성법은 복잡한 시스템의 동특성을 구성 부품의 주파수 응답 함수와 연결 요소의 동특성으로부터 예측하는 기법이다. 이 기법을 적용하기 위하여 상부지그-마운트-하부지그로 구성된 시스템의 결합 방정식을 유도하였다. 상부지그-마운트-하부지그 조립체에 볼트형 축력 센서를 삽입하고, 캐빈 마운트의 실제 하중과 동일한 예압을 마운트에 가하였다. 상부지그와 하부지그에 30개의 가진점과 8개의 응답점을 선정한 후, 관성 가진기(inertial shaker)를 이용하여 상부지그-마운트-하부지그 조립체에 대한 전달함수를 취득하였다. 취득한 전달함수와 좌표 조건을 이용한 가상 지점 변환 기법(virtual point transformation technique)을 이용하여 마운트의 입력점 및 출력점의 전달함수를 구한 후, 조립체의 전달 및 입/출력점 강성을 도출하였다. 또한, 상/하부지그 각각의 입력점 강성을 측정 후 결합 방정식을 이용하여 마운트의 6자유도 동강성을 도출하였다.

압전작동기를 이용한 무인항공기 EO/IR 센서 마운트의 능동 진동 제어

박동현(Park, Dong-Hyun),최승복(Choi, Seung-Bok) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.12

This paper presents an inertia type of piezostack based active mount fur unmanned aero vehicle (UAV) camera system. After identifying the stiffness and damping properties of the rubber element and piezostack a mechanical model of the active mount system is established. The governing equation of mount is then derived and expressed in a state space form. Subsequently, a sliding mode controller which is robust to uncertain parameters is designed in order to reduce the vibration imposed according to the military specification associated with UAV camera mount system operation. Control performances such as acceleration and transmitted force are evaluated through both computer simulation and experimental implementation.

방진 마운트의 동적 강성을 고려한 선체 바닥 및 받침대의 강성과 임피던스 규제에 대한 고찰

한형석(Han, Hyung-Suk),손윤준(Son, Yoon-Jun) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3

The mechanical impedance and stiffness of the foundation of shipboard equipments and hulls supported by anti-vibration mount are very important so that the anti-vibration mount can accomplish its performance effectively. But, it is frequently argued how much stiffness and mechanical impedance are necessary for those foundations and hulls. In this research, it is discussed by evaluating the dynamic stiffness of the commercial anti-vibration mounts used in a naval vessel. Consequently, in this research, the minimum level of the mechanical impedance and stiffness of the foundation of shipboard equipments and hulls are suggested considering the dynamic stiffness of the mount which varies as frequency.

고무와 압전작동기를 이용한 하이브리드 마운트의 설계 및 진동제어 응용

육지용(Yook, Ji-Yong),성금길(Sung, Kum-Gil),문석준(Moon, Seok-Jun),최승복(Choi, Seung-Bok) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.5

This paper presents active vibration control using a hybrid mount which consists of rubber element and the piezostack actuator. After identifying stiffness and damping properties of the rubber element and piezoelectric elements, a mechanical model of the hybrid mount is established. The mount model is then incorporated with the vibration system, and the governing equation of motion is obtained in a state space. A sliding mode controller and LQG controller are designed in order to actively attenuate the vibration of the system subjected to various frequencies and small magnitude excitations. Control responses such as acceleration and force transmission through the hybrid mount are evaluated by computer simulation.

Design of a Rubber Mount for Vibration Reduction in a Slim Optical Disk Drive

Kug Weon Kim(김국원),Nam Woong Kim(김남웅) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.6

With the increase of track density, high rotational speed and the compatibility for various media in optical disk drives, the effective design to vibration reduction is very important for robust operation. Especially when a slim optical disk drive for a notebook PC is excited by a mass-unbalanced disk, internal vibration and its transmission to external case bring about severer problem than that of conventional one. In this paper a design process of a rubber mount in a slim optical disk drive for vibration reduction is presented. The characteristics of rubbery materials - hyper-elastic and visco-elastic - are measured with standard specimens. The static stiffness of a rubber mount was calculated by FEM and the dynamic stiffness is predicted with the static stiffness and the impedance test data of the standard specimen. The transmissibility tests are performed for the purpose of verification of the design process.

자동차용 모터 마운트의 내구수명 예측

문형일(Hyung-il Moon),안정호(Jung ho An),김헌영(Heon Young Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

The demand to acquire and improve durability performance has steadily risen lately in rubber components design due to a demand for advanced emotional characteristics and the use of unitized or module components. In designing, an analytical estimation is the most effective way to improve endurance life. Existing methods of analytical estimation have mainly used a formula of endurance life obtained from fatigue test data. However, due to costs and time required for fatigue testing, as well as randomness of rubber materials, the rate at which such formula is used remains insignificant. In this paper, we describe endurance life estimation of an automotive motor mount using only the results from a relatively simple tearing test. For this, we performed tearing tests on natural rubber of various hardness used for manufacture of vibroisolating mount, and compared tearing factors in static and dynamic states. Also, using static deformation analysis and the tearing test data, we estimated endurance life of the motor mount and tested reliability of the proposed method by comparing the estimated values with actual test results.

엔진마운팅 시스템 해석 및 최적화 방법론 연구

김승원(Seungwon Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

The Engine Mounting is the system to connect P/trian which happens the vibration at the frame. A main performance insoluates with the vibration and control to the behavior of P/Train. And, the system is examined to the main design parameter which infulence NVH and R&H of the vehicle. We need the DATA review about mount’s location and characteristic through an optimization method from a vehicle development for the first time. But, because the engine mount is composed of a rubber which has a non-linear characteristic, the error about it’s performance happens. The case which is apply for the result of a system optimization is rare To solve an upside problem, this paper is suggested to method of total optimization intergrated system analysis and the process about rubber characteristic pridection though finite element method. As, applied for the intergrated optimization process, we exapnd the design parameter in mount’s characteristic to mount’s shape and material. Thus, including mount’s shape and material at the optimization process’s boundary condition, we could minimize the error which happened a mounts’s manufacture. And we can apply optimia solution for vehicle and mininize coast and period about development.