• Title, Summary, Keyword: optimal performance

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Performance Tuning Method of Inverse Optimal PID Control for Mechanical Systems

  • Choi, Young-Jin;Chung, Wan-Kyun;Youm, Young-Il
    • 제어로봇시스템학회:학술대회논문집
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    • pp.62.1-62
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    • 2001
  • This paper suggests an inverse optimal PID control design method for the trajectory tracking case of mechanical systems. Also, simple coarse/fine performance tuning laws are suggested based on the analysis for performance limitation of inverse optimal PID controller. Experimental results for a robot manipulator show the validity of our analysis for the performance tuning methods.

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Optimal Performance Design for Concrete Median Barrier with Crashworthiness Analysis (차량 충돌 해석을 통한 중앙분리대의 최적 성능 설계)

  • 한석영;고성호;최형연
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.1
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    • pp.168-178
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    • 2002
  • The purpose of this study is to develop an optimal performance design ova concrete median barrier using the design of experiment and crash simulation which is done by Pam-Crash, one of the commercial crash simulation software. A formula of characteristic value was suggested to obtain an optimal performance design considering all of von Mises stress, volume and acceleration at center of gravity of a heavy truck. An optimal design of a concrete median barrier was obtained by the analysis of variance based on design of experiment and crash simulation. A crash simulation with the optimal design was accomplished in order to verify the suitability of the suggested formula and the proper application of the design of experiment. The obtained optimal design was satisfied for a domestic design regulation of a concrete median barrier.

An Experimental Study of Optimal Performance of Rear Wheel Steering Vehicle for Maneuverability (기동성을 위한 후륜 조향 차량의 최적 성능에 대한 연구)

  • Ann, Kookjin;Joa, Eunhyek;Park, Kwanwoo;Yoon, Youngsik;Yi, Kyongsu
    • Journal of Auto-vehicle Safety Association
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    • v.11 no.2
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    • pp.23-28
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    • 2019
  • This paper presents an optimal performance of rear wheel steering vehicle for maneuverability. The maneuverability of vehicle is evaluated in terms of yaw rate, body slip angle and driver input. The maneuverability of vehicle can be improved by rear wheel steering system. To obtain optimal performance of rear wheel steering vehicle, the optimal control history is designed. The high dimensional trajectory optimization problem is solved by formulating a quadratic program considering rear wheel steer input. To evaluate handling performance 7 degree-of-freedom vehicle model with actuation sub-models is designed. A step steer test is conducted to evaluate rear wheel steering vehicle. A response time, a TB factor, overshoot, and yaw rate gain are investigated through objective criteria, assessment webs. The handling performance of vehicle is evaluated via computer simulations. It has been shown from simulation studies that optimal controlled rear wheel steering vehicle provides improved performance compared to others.

Optimal Windows Transmittance by Energy Performance Analysis and Subjective Evaluation in office building (에너지성능분석 및 감성평가에 의한 오피스 창호의 적정 투과율 선정)

  • Kim, Byoung-Soo;Kim, Jung-Shin;Yim, Oh-Yon
    • Journal of the Korean Solar Energy Society
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    • v.24 no.3
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    • pp.73-83
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    • 2004
  • The purpose of this study is to select the optimal transmittance rate of windows in office buildings through subjective evaluation and energy performance analysis(computer simulation program ; DOE 2.1E). The results are as follows ; 1) In the subjective evaluation experiment, minimum transmittance of the glass is GE 30% and LT 70%, but the optimal transmittance rate is concluded in $40%\sim60%$. 2) As a result of the energy performance analysis, it is desirable for the building of consumptive with mainly air-conditioning to make transmittance as 40-60%. 3) Comparing foreign study on minimum and optimal transmittance rate is $25%\sim38%$, the minimum transmittance of this study is almost the same. But for the optimal transmittance rate, 20% more is needed for KOREAN.

Performance based optimal seismic retrofitting of yielding plane frames using added viscous damping

  • Lavan, O.;Levy, R.
    • Earthquakes and Structures
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    • v.1 no.3
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    • pp.307-326
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    • 2010
  • This paper is concerned with the optimal seismic design of added viscous dampers in yielding plane frames. The total added damping is minimized for allowable values of local performance indices under the excitation of an ensemble of ground motions in both regular and irregular structures. The local performance indices are taken as the maximal inter-story drift of each story and/or the normalized hysteretic energy dissipated at each of the plastic hinges. Gradients of the constraints with respect to the design variables (damping coefficients) are derived, via optimal control theory, to enable an efficient first order optimization scheme to be used for the solution of the problem. An example of a ten story three bay frame is presented. This example reveals the following 'fully stressed characteristics' of the optimal solution: damping is assigned only to stories for which the local performance index has reached the allowable value. This may enable the application of efficient and practical analysis/redesign type methods for the optimal design of viscous dampers in yielding plane frames.

Optimum maintenance scenario generation for existing steel-girder bridges based on lifetime performance and cost

  • Park, Kyung Hoon;Lee, Sang Yoon;Yoon, Jung Hyun;Cho, Hyo Nam;Kong, Jung Sik
    • Smart Structures and Systems
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    • v.4 no.5
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    • pp.641-653
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    • 2008
  • This paper proposes a practical and realistic method to establish an optimal lifetime maintenance strategy for deteriorating bridges by considering the life-cycle performance as well as the life-cycle cost. The proposed method offers a set of optimal tradeoff maintenance scenarios among other conflicting objectives, such as minimizing cost and maximizing performance. A genetic algorithm is used to generate a set of maintenance scenarios that is a multi-objective combinatorial optimization problem related to the lifetime performance and the life-cycle cost as separate objective functions. A computer program, which generates optimal maintenance scenarios, was developed based on the proposed method using the life-cycle costs and the performance of bridges. The subordinate relation between bridge members has been considered to decide optimal maintenance sequence and a corresponding algorithm has been implemented into the program. The developed program has been used to present a procedure for finding an optimal maintenance scenario for steel-girder bridges on the Korean National Road. Through this bridge maintenance scenario analysis, it is expected that the developed method and program can be effectively used to allow bridge managers an optimal maintenance strategy satisfying various constraints and requirements.

Optimal contact force control for a linear magnetostatic actuator (선형 Magnetostatic 작동기의 정밀 접촉력제어를 위한 최적제어기 설계)

  • ;Masada, G.;Busch-Vishniac, I.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.272-275
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    • 1997
  • When a manipulator makes contact with an object having position uncertainty, performance measures vary considerably with the control law. To achieve the optimal solution for this problem, an unique objective function that weights time and impact force is suggested and is solved with the help of variational calculus. The resulting optimal velocity profile is then modified to define a sliding mode for the impact and force control. The sliding mode control technique is used to achieve the desired performance. Sets of experiments are performed, which show superior performance compared to any existing controller.

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Performance Analysis of the state model based optimal FIR filter (STATE MODEL BASED OPTIMAL FIR 필터의 성능분석)

  • Lee, Kyu-Seung;Kwon, Wook-Hyun
    • Proceedings of the KIEE Conference
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    • pp.917-920
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    • 1988
  • The effects of the errors due to incorrect a priori informations on the noise model as well as the system model in the continuous state model based optimal FIR filter is considered. When the optimal filter is perturbed, the error covariance is derived. From this equation, the performance of the state model based optimal FIR filter is analyzed for the given modeling error. Also the state model based optimal FIR filter is compared to the standard Kalman filter by an example.

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Low Sensitive Optimal Steering System of Ships at Sea (저감도최적조타계의 설계에 관한 연구)

  • 이철영
    • Journal of the Korean Institute of Navigation
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    • v.4 no.1
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    • pp.19-30
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    • 1980
  • The usual procedure for the optimal design of ship's steering system is to minimize a chosen quadratic performance index, which isdetermined from the view point of economic run. However, the optimal control synthesized in such a straightforward fashion is unsatisfactory because ship's parameters differ from their nominal values due to uncertainties and errors in measurement and/or simplifications in mathematical modelling, and/or the variation of the ship's loading condition. In an attempt to resolve this difficulty, this paper presents a method for designing a low sensitive optimal steering system in a way as to minimize not only given performance index but also the sensitivity of the performance index and trajectory sensitivity. It is also shown that the optimal control so obtained will result in a system whose performance index and transient response are low sensitive to small varation in ship's time constant.

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