정밀 위치 제어를 위해 MR 밸브 시스템을 활용한 차량 유압 리프트에 대한 수치해석적 고찰 A Numerical Study of New Vehicle Hydraulic Lift Activation by a Magneto-rheological Valve System for Precise Position Control원문보기
최근 기존의 유압 차량 리프트는 높이제어의 어려움으로 인해 기술개발의 한계에 직면하였다. 휠 얼라이먼트나 차량의 하중 분포에 따른 미세한 불규칙적인 변형을 보상하기 위해서는 매우 정밀한 위치 제어성이 요구되고 있다. 이 연구에서는 이러한 기존 리프트 시스템의 한계를 해결하고자 매우 정교한 압력강하를 이끌어낼 수 있는 MR 밸브 시스템을 활용하여 새로운 차량 리프트를 제안하고 이에 대한 분석을 진행한다. 우선적으로 MR 밸브의 요구되는 성능을 파악하기 위해 유압 리프트의 운동방정식을 설립하고, 요구되는 압력강하를 얻기 위해 MR 밸브를 설계한다. 또한 정밀한 위치 제어 성능을 얻기 위해 PID 제어기를 설립하고, 시뮬레이션을 통해 제안된 시스템의 제어성을 검증한다.
최근 기존의 유압 차량 리프트는 높이제어의 어려움으로 인해 기술개발의 한계에 직면하였다. 휠 얼라이먼트나 차량의 하중 분포에 따른 미세한 불규칙적인 변형을 보상하기 위해서는 매우 정밀한 위치 제어성이 요구되고 있다. 이 연구에서는 이러한 기존 리프트 시스템의 한계를 해결하고자 매우 정교한 압력강하를 이끌어낼 수 있는 MR 밸브 시스템을 활용하여 새로운 차량 리프트를 제안하고 이에 대한 분석을 진행한다. 우선적으로 MR 밸브의 요구되는 성능을 파악하기 위해 유압 리프트의 운동방정식을 설립하고, 요구되는 압력강하를 얻기 위해 MR 밸브를 설계한다. 또한 정밀한 위치 제어 성능을 얻기 위해 PID 제어기를 설립하고, 시뮬레이션을 통해 제안된 시스템의 제어성을 검증한다.
Recently, conventional hydraulic car lift systems face the technological limitations due to a lack of height control. The demand for height controllability is required in many tasks such as wheel alignment, and requires compensation for the structural deformation of the lift caused by irregular load...
Recently, conventional hydraulic car lift systems face the technological limitations due to a lack of height control. The demand for height controllability is required in many tasks such as wheel alignment, and requires compensation for the structural deformation of the lift caused by irregular load distribution. In order to resolve this limitation of the conventional car lift, in this work, a new type of a hydraulic vehicle lift using a magneto-rheological (MR) valve system is proposed and analyzed. Firstly, the dynamic model of vehicle lift is formulated to evaluate control performance; subsequently, an MR valve is designed to obtain the desired pressure drop required in the car lift. Next, a proportional-integral-derivative (PID) controller is formulated to achieve accurate control of the lifting height and then computer simulations are undertaken to show accurate height control performances of the proposed new car lift system.
Recently, conventional hydraulic car lift systems face the technological limitations due to a lack of height control. The demand for height controllability is required in many tasks such as wheel alignment, and requires compensation for the structural deformation of the lift caused by irregular load distribution. In order to resolve this limitation of the conventional car lift, in this work, a new type of a hydraulic vehicle lift using a magneto-rheological (MR) valve system is proposed and analyzed. Firstly, the dynamic model of vehicle lift is formulated to evaluate control performance; subsequently, an MR valve is designed to obtain the desired pressure drop required in the car lift. Next, a proportional-integral-derivative (PID) controller is formulated to achieve accurate control of the lifting height and then computer simulations are undertaken to show accurate height control performances of the proposed new car lift system.
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문제 정의
From the previous research, the advantages of MR hydraulic valve systems can be defined as follows: (1) great controllability, (2) faster response, (3) lack of moving parts, (4) no mechanical complexity, (5) high power density, and (6) great durability. Consequently, the main contribution of this work is to propose a new type of hydraulic vehicle lift based on an MR hydraulic valve system to obtain precise position control performance. In order to achieve this goal, a mathematical model of the hydraulic vehicle lift is formulated to identify the required performance of the hydraulic MR valve system.
제안 방법
Consequently, the main contribution of this work is to propose a new type of hydraulic vehicle lift based on an MR hydraulic valve system to obtain precise position control performance. In order to achieve this goal, a mathematical model of the hydraulic vehicle lift is formulated to identify the required performance of the hydraulic MR valve system. Next, the control performance of the designed system is evaluated through a numerical analysis.
In order to satisfy the objective of this work, a target specification of the vehicle lift can be defined as follows: (1) mass of lifted vehicle is less than 2000 kg, (2) controllable height range of top table is from 0.3 m to 1.9 m, and (3) accuracy of position control is ±0.5 mm.
In this work, a new type of hydraulic vehicle lift was proposed using the MR hydraulic valve system to obtain precise position control performance. The governing equations of motion were derived from the vehicle lift structure to identify the required performance of the hydraulic MR valve.
In order to achieve this goal, a mathematical model of the hydraulic vehicle lift is formulated to identify the required performance of the hydraulic MR valve system. Next, the control performance of the designed system is evaluated through a numerical analysis.
The MR valve is designed to achieve a sufficient pressure drop for the control motion and the magnetic analysis is performed to obtain the relationship between the input current and pressure drop value based on the finite element method tool. Next, the evaluation of their control performances was performed by numerical simulation and it was shown that the proposed controllable system satisfies the required target specifications for the hydraulic vehicle lift. It is finally noted that the hardware test to verify the proposed system will be undertaken as a second phase of this work in the near future.
대상 데이터
Firstly, the governing equation of the lift motion should be derived to determine the required performance of the MR valve and evaluate the control performance of the hydraulic vehicle lift. In this work, mtp, mmar, and mv are the mass of top table, main rod, and vehicle, respectively, with values of 420 kg, 170 kg, and 2000 kg, respectively. Imar, the rotational moment of inertia of a main rod at Point E, is 286 kg․m2.
presents the pressure drop due to the viscosity of the MR fluid. In this work, the commercially available MR fluid, MRF132DG from Lord Corporation, is used: its dynamic viscosity, Q, is 0.112. The flow rate of MR fluid, Q, is 141 mL/s.
5(b) shows the geometric parameter of MR valve. The coil is made of 300 turns of 23 AWG(American Wire Gauge) copper wire. The analytical pressure drop value of MR valve that is composed of two parts can be presented as follows(6):
이론/모형
The governing equations of motion were derived from the vehicle lift structure to identify the required performance of the hydraulic MR valve. The MR valve is designed to achieve a sufficient pressure drop for the control motion and the magnetic analysis is performed to obtain the relationship between the input current and pressure drop value based on the finite element method tool. Next, the evaluation of their control performances was performed by numerical simulation and it was shown that the proposed controllable system satisfies the required target specifications for the hydraulic vehicle lift.
참고문헌 (7)
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