• Title/Summary/Keyword: Control and response characteristics

Search Result 1,479, Processing Time 0.03 seconds

The comparison of the output characteristics of 2-DOF PID controller in the multivariable flow control system with delayed time (지연시간을 갖는 다변수 유량제어 시스템의 2-자유도 PID 제어기 특성 비교)

  • Kim, Dong-Hwa
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.5 no.6
    • /
    • pp.744-752
    • /
    • 1999
  • In this paper, we studied the response characteristics of $\alpha$, $\beta$ separated type, combined type, PI typed, and feedforward type in 2DOF-PID controller through the simulation and the experiments designed with the multivariable flow control system. The parameters $\alpha$ and $\beta$ give an affect to characteristics of controller in separated type but $\gamma$ does not give an affect to the characteristics of 2-DOF PID. The more $\beta$ increases, the more overshoot decreases and especially, in case of PI type represent clearly. The $\alpha$, $\beta$ separated type has a very small overshoot and its magnitudes in 2-DOF PID onctroller increases in order of $\alpha$, $\beta$ combined type, PI type, feedforward type, conventional type. The response characteristics of simulation are similar to that of experiments but the experimental characteristics in the multivariable flow control system has the delayed response. The time delay of response in experiments depends on 2-DOF parameter $\alpha$, $\beta$, $\gamma$ and the overshoot increase as the $\alpha$, $\beta$, $\gamma$ increase. So, we can have a satisfactory response by tuning D gain.

  • PDF

Direct Torque Control of a Synchronous Reluctance Motor Using the Finite Element Method

  • Lee Sang-Don
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.5B no.2
    • /
    • pp.173-180
    • /
    • 2005
  • The construction of a Synchronous Reluctance Motor (SynRM) is simple and also highly economical because a stator from the existing AC motor can be used. Since the synchronous inductance in the Synchronous Reluctance Motor is an element that is proportional to torque, its exact value must be experimentally or analytically found for accurate control and performance development of the motor. In this paper, direct torque control (DTC) simulation is carried out to maximize the torque of the Synchronous Reluctance Motor and the fast response characteristics with the inductance value by the Finite Element Method (FEM). The response characteristics are compared through the proposed direct torque control and torque response characteristics that are based on the existing PI Control in order to confirm the fast response features. To test the performance of the direct torque controller, the torque response is analyzed with variable speed and load condition.

A Study on the Frequency Response Characteristics of High Response Flow Control Servo Valve (고 응답 유량제어 서보밸브의 주파수 응답특성에 관한 연구)

  • 서종수;신유식;지명국;전영흥;정효민;정한식
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.15 no.6
    • /
    • pp.480-488
    • /
    • 2003
  • The purpose of this research Is to derive the principal design parameters governing the dynamic characteristics of the high response flow control servo valve. For this purpose, a numerical modeling of the servo valve system and a parameter sensitivity analysis to a frequency response characteristics was peformed. As a result of these analysis, a basis for improvement of a dynamic characteristics of servo valve was arranged.

Improvement of Microstep Characteristics in Hydrostatic Table with Ballscrew (볼스크류로 구동되는 유정압테이블의 미소이송특성 향상)

  • 황주호;박천홍;이찬홍;이후상
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.15 no.1
    • /
    • pp.94-100
    • /
    • 1998
  • Microstep characteristics largely depends on the variation of friction force induced by the geometric accuracy of ballscrew, guide rail and the control characteristics of servo unit. In this paper, for improving the microstep characteristics of hydrostatic table with ballscrew, microstep resolution according to the control mode of servo amplifier and response characteristic by the variation of integral gain are tested and compared. Relationship between micro motion behavior of hydrostatic table and the output torque is also tested for acquiring the effective variables on control characteristics. From the results. it is confirmed that the torque control mode has a advantage in microstep resolution, and more stable than velocity control mode in low feed rate, and by the increase of integral gain in the elastic motion realm, response characteristics can be improved.

  • PDF

Improvement of the Response Characteristics Using the Fuzzy-PLL Controller (퍼지-PLL 제어기를 이용한 응답특성 개선)

  • Cho, Jeong-Hwan;Seo, Choon-Weon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.19 no.1
    • /
    • pp.175-181
    • /
    • 2005
  • This paper proposes the fuzzy-PLL control system for fast response time and precision control of automation systems. The conventional PLL has not only a jitter noise caused from such a demerit of the wide dead zone, but also a long delay interval that makes a high speed operation unable. In order to solve the problems, the proposed system, which provides the improvement in terms of the control region in high speed and precision control, first used the fuzzy control method for fast response time and when the error reaches the preset value, used the PLL method designing new PFD for precision control. The new designed multi-PFD improves the dead zone, jitter noise and response characteristics, which is consists of P-PFD(Positive edge triggered PFD) and N-PFD(Negative edge triggered PFD) and can improve response characteristics to increase PFD gain.

A Study on Control Characteristics of Translation System Using PD Control and LQR (PD제어와 LQR을 이용한 병진 시스템의 제어특성 연구)

  • 김택현;정상화;이동하
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.10 no.5
    • /
    • pp.78-84
    • /
    • 2001
  • The translation system is made up of springs, masses and a dashpot. This precise piece of equipment is controlled electro-mechanically by a motor and operating program. The control strategy of the system can be changed by spring stiffness, change of mass, and the damping coefficient of the dashpot. This system proves the necessity and effect of a closed loop control. In this paper, PD control experiments were implemented for the translation system. When the north falter was added on the PD controller, we compared the response characteristics of the two systems. The state feedback controller minimized scalar control gains and the resulting response characteristics of the system were studied using the LQR design. Finally, we improved the response characteristics of the translation system which are rising time, settling time, steady state error, and overshoot LQR was better as compared with PD control.

  • PDF

Study on Mathematical Modeling and Response Characteristics of High-speed Solenoid Valve for Aero-engine

  • Zhang, Xiaodong;Yang, Yutao
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2008.03a
    • /
    • pp.80-83
    • /
    • 2008
  • Because of its advantages of simple structure, fast response speed, strong anti-pollution ability and good stability, high-speed solenoid valve has been widely used in aeroengine control systems, and some performances of the aeroengine control systems were affected directly by the response speed of high-speed solenoid valve. For some two-position two-way highspeed solenoid cone-valve, the paper discusses the establishment of its mathematical model and analyses its response characteristics by simulation model which is run in simulink of Matlab. Further more, a backstepping and segmentation method is used in the research of response characteristics, and the method is proved to be an accurate, fast and new method to get the influences of parameters on the valve s response characteristics.

  • PDF

Control and Response Characteristics of a Continuously Variable ER Damper (연속가변 ER 댐퍼의 제어 및 응답특성)

  • 최승복;최영태;박우철;정재천;서문석;여문수
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.4 no.6
    • /
    • pp.164-174
    • /
    • 1996
  • This paper presents control and response characteristics of a continuously variable ER(electrorheological) damper for small-sized vehicles. The ER damper is devised and its governing equation of motion is derived from the bond graph model. The field-dependent yield shear stresses are distilled from experimental investigation on the Bingham property of the ER fluid. The distilled data are incorporated into the governing system model and, on the basis of this model, an appropriate size of the ER damper is manufactured. After evaluating the field-dependent damping performance of the proposed ER damper, the skyhook control algorithm is formulated to achieve desired level of the damping force. The controller is then experimentally implemented and control characteristics of the ER damper are presented in order to demonstrate superior controllability of the damping force. In addition, response characteristics of the damping force with respect to the electric field with fast on-off frequency are provided to show the feasibility of practical application.

  • PDF

Effect of solenoid valves on the response characteristics of a hydraulic position-control system (솔레노이드 밸브가 유압위치제어 시스템의 응답특성에 미치는 영향)

  • 장효환;안병홍
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1987.10b
    • /
    • pp.364-369
    • /
    • 1987
  • It has recently shown that a solenoid valve can be utilized in a hydraulic position-control system by discontinuous control methods. The objective of this study is to investigate the effects of solenoid valves on the response characteristics of a hydraulic position-control system by applying two kinds of discontinued control methods i.e., Simple On-Off (SOF) and Pusating On-Off(POF) controls. Three types of solenoid valves i.e. low-frequency, closed-center type (LF/C), high-frequency, closed-center type (HF/C), low-frequency, tandem-center type(LF/T) were used in this study. Effects of loading conditions and control parameters on the response characteristics were experimentally examined and compared each other. Pressure transients within the actuator were also studied.

  • PDF

A Study on the Response Time Characteristics Related to Shock Control in the Hydraulic System Using the Fluid Device (유체기구를 이용한 유압계통의 충격치제어에 수반되는 응답시간 변화특성에 관한 연구)

  • Lee, Joo-Seong;Lee, Kye-Bock;Lee, Chung-Gu
    • Proceedings of the KSME Conference
    • /
    • 2001.11b
    • /
    • pp.597-603
    • /
    • 2001
  • Control of pressure transients in a hydraulic system may be important and necessary to avoid failures and to improve the efficiency of operation. Flow restricting devices can result in a decrease in the peak pressure, but may change the response time. The response time has an important effect on both operator and operator perceived smoothness. The response time should correspond to how fast a system responds to a given disturbance at the system boundary. Occasionally the appropriate response time is not easily determined. This study is on the response time characteristics in the hydraulic system studied for the control of response time.

  • PDF