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Rubber Tube의 고무 및 코드지에 따른 Air Suspension 성능에 관한 연구
박태원(Taewon Park),김성수(Seongsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, for the automobile ride comfort, more and more air suspensions with rubber tube are applied on automobile suspension system in substitute for the conventional coiled spring type suspension. In this study, the optimum design of rubber and cord materials in rubber tube to improve the performance of air suspensions by using the design of experiment have been studied. To find the optimum design, we altered the fillers and antioxidants in CR (chloroprene rubber) compounds having a good resistance to ozone, and changed the cord angle and thickness of polyamide cord. We produced rubber tubes using the cord reinforced rubber composite materials, and analyzed/measured the physical properties, microstructure, and dimensions. And we evaluated the load capacity, the static and dynamic spring characteristics, outer diameter changes and pressure changes in the loading, and burst pressure of air suspension. Finally, we performed the durability test (3×10? cycles) with air suspension assay and verified the optimal conditions of rubber and cord materials.
이재천(J. C. Lee) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.4
This study presents an analytical model of the pneumatic circuit of an air suspension system to analyze the characteristics of vehicle height control. The analytical model was developed through the co-simulation of Simulink(air spring) and HyPneu(pneumatic circuit). Variant effective area of air spring and flow coefficients of pneumatic valves were estimated experimentally prior to the system test, and utilized in simulation. One-comer test apparatus was established using the components of commercial air suspension products. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the frictional loss of conduit and heat dissipation which were ignored in this study need to be considered in future study. As an application example of proposed analytical model, an alternative pneumatic circuit of air suspension to conventional WABCO circuit was evaluated. The comparison of simulation results of WABCO circuit and alternative circuit show that proposed analytical model of co-simulation in this study is useful for the study of pneumatic system of automotive air suspension.
FUZZY ADAPTIVE SLIDING MODE CONTROLLER FOR AN AIR SPRING ACTIVE SUSPENSION
W.-N. BAO,L.-P. CHEN,Y.-Q. ZHANG,Y.-S. ZHAO 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.7
A fuzzy adaptive sliding mode controller for an air spring active suspension system is developed. Due to nonlinearity, preload-dependent spring force and parameter uncertainty in the air spring, it is difficult to control the suspension system. To achieve the desired performance, a fuzzy adaptive sliding mode controller (FASMC) is designed to improve the passenger comfort and the manipulability of the vehicle. The fuzzy adaptive system handles the nonlinearity and uncertainty of the air suspension. A normal linear suspension model with an optimal state feedback control is designed as the reference model. The simulation results show that this control scheme more effectively and robustly isolates vibrations of the vehicle body than the conventional sliding mode controller (CSMC).
유공압 회로를 이용한 자전거 포크용 가변댐퍼-공압스프링 서스펜션의 해석
장문석,최영휴,김수태,최재일 사단법인 유공압건설기계학회 2019 드라이브·컨트롤 Vol.16 No.1
The objective of this study was to present a damped pneumatic suspension, a bike fork suspension, which can adapt itself to incoming road excitations is presented in this paper. It consists of a hydraulic damper and a pneumatic spring in parallel with a linear spring. The study also proposed a variable and switchable orifice, in the hydraulic damper, to select appropriate damping property. Hydraulic-pneumatic circuit model for the bike fork suspension was established based on AMESim, in order to predict its performance. In addition, elastic-damping characteristics of the fork such as spring constant and viscous damping coefficient were computed and compared, for validation, with those evaluated by experiment using the universal test machine. Through simulation analysis and test, it was established that the hydraulic-pneumatic circuit model is effective and practical for development of future MTB suspensions.
전갑진(Kab-Jin Jun),박태원(Tae-Won Park),이수호(Su-Ho Lee),윤지원(Ji-Won Yoon),권순기(Soon-Ki Kwon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The air suspension system is widely used in commercial vehicles such as buses or special purpose trucks because it improves ride better than any other types of suspension. Since the durability of vehicle parts is directly related to the safety, the evaluation of the durability at the design state is necessary. In this research, the fatigue life of the air suspension frame for trucks is predicted by the modal stress recovery(MSR) method. Using the process proposed in this research, the fatigue life of vehicle parts can be predicted efficiently at the design stage.
전병호(Byoung-Ho Jun),김병곤(Byung-Gon Kim),사공준(Joon Sakong),한영섭(Young-Sup Han),이병상(Byoung-Sang Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
기존의 코일 스프링과 일반 댐퍼를 적용한 차량은 차량 하중의 증감에 따라서 차고의 변동이 발생하며, 노면 또는 주행조건과 상관없는 일정한 감쇄력을 가지므로 핸들링과 승차감을 동시에 만족시키기 어렵다. 본 논문에서 다루는 공기현가장치 ECU는 차고 제어와 감쇄력 제어의 통합환경으로 구성되며, 에어스프링과 가변 댐퍼를 동시에 제어함으로써, 차량의 하중 조건과 주행조건에 따른 최적의 차고를 유지시키고 주행조건에 따른 감쇄력을 조절을 통해 조종안정성 및 승차감을 향상 시키기 위해 개발되었다. 본 논문은 현대모비스가 개발한 공기현가장치 ECU의 동작원리, 설계, 검증 및 시험에 관하여 설명한다.
서재영,임경채,김재영,김영철 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.5
The Z-type spring is a key part of the non-vibration air suspension. The non-vibration air suspension was developed long ago and widely used in developed countries. It has strong durability, provides a smooth ride, protects the vehicle body, and protects luggages from damage in truck. In this study, the structural strength of the Z-type spring was evaluated by computing the maximum displacement and the von Mises maximum stress results from applying the load condition based on the maximum weight of luggage in the rear space of a truck.
ANALYSIS AND OPTIMIZATION OF AIR SUSPENSION SYSTEM WITH INDEPENDENT HEIGHT AND STIFFNESS TUNING
P. KARIMI ESKANDARY,A. KHAJEPOUR,A. WONG,M. ANSARI 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.5
Suspensions play a crucial role in vehicle comfort and handling. Different types of suspensions have been proposed to address essential comfort and handling requirements of vehicles. The conventional air suspension systems use a single flexible rubber airbag to transfer the chassis load to the wheels. In this type of air suspensions, the chassis height can be controlled by further inflating the airbag; however, the suspension stiffness is not controllable, and it depends on the airbag volume and chassis load. A recent development in a new air suspension includes two air chambers (rubber airbags), allowing independent ride height and stiffness tuning. In this air suspension system, stiffness and ride height of the vehicle can be simultaneously altered for different driving conditions by controlling the air pressure in the two air chambers. This allows the vehicle’s natural frequency and height to be adjusted according to the load and road conditions. This article discusses optimization of an air suspension design with ride height and stiffness tuning. An analytical formulation is developed to yield the optimum design of the new air suspension system. Experimental results verify the mathematical modeling and show the advantages of the new air suspension system.
정윤식(Yoon-Sik Jung),신헌섭(Heon-Seop Shin),임성수(Sungsoo Rhim),최진환(Jin-Hwan Choi) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.8
현재 전기자동차의 높은 에너지 효율 및 승차감을 모두 만족시키기 위해 경량 서스펜션 개발에 많은 초점이 맞추어 지고 있다. 개발되고 있는 경량 서스펜션중 rubber tube로 만들어진 에어서스펜션이 에너지효율 및 승차감을 만족시킨다고 평가 받고 있다. 본 논문에서는 높은 전장비의 특징을 가지는 전기자동차용 에어서스펜션을 개발하였다. 또한 실제 에어서스펜션의 성능 향상 연구를 위해 유연 다물체 동역학 모델(MFBD) 방법을 이용하여 모델링하였고, 에어서스펜션에서 중요한 역할을 하는 rubber tube의 경우는 FE기법을 통해 모델링 하였다. 에어서스펜션의 각 모듈 특성을 고려하여 모듈별 물성실험을 진행 및 물성치를 추정하였다. MFBD모델의 신뢰성 확인을 위해 물성치를 적용시킨 시뮬레이션 결과와 실제 실험결과를 비교하였다. To improve the energy efficiency and ride quality of an electric vehicle, it is highly desirable to develop a lightweight suspension system with high travel ratio. Air suspension systems with a rubber tube are often considered optimal for such requirements. In this study, a new lightweight air suspension system with high travel ratio was developed for use in electric vehicles. Furthermore, an FE-based multi-flexible-body dynamics (MFBD) model of the suspension system was developed as a tool for improving the design of an actual suspension system. The MFBD model includes the FE modeling of the rubber tube module as well as other essential parts of the air suspension system. The system parameters for the model were obtained from various experiments. The validity of the developed MFBD model was shown through a comparison between the experimental results and the simulation results.