• Title/Summary/Keyword: design variable

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Design of nonlinear variable structure controller using differential geometric methods (미분기하학 방법을 이용한 비선형 가변구조 제어기 설계)

  • 함철주;함운철
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.1227-1233
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    • 1993
  • In this paper we present the differential geometric approach for the analysis and design of sliding modes in nonlinear variable structure feedback systems. We also design the robust controller for the nonlinear system using variable structure control theory on the basis of differential geometric methods and feedback linearization applying Min-Max control based on the Lyapunov second method. The robustness against parameter uncertainties for robot manipulators with flexible joint is considered. Simulation results are presented and show the advantage of the proposed nonlinear control method.

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Γ-CONVERGENCE FOR AN OPTIMAL DESIGN PROBLEM WITH VARIABLE EXPONENT

  • HAMDI ZORGATI
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.27 no.4
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    • pp.296-310
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    • 2023
  • In this paper, we derive the Γ-limit of functionals pertaining to some optimal material distribution problems that involve a variable exponent, as the exponent goes to infinity. In addition, we prove a relaxation result for supremal optimal design functionals with respect to the weak-∗ L(Ω; [0, 1])× W1,p0 (Ω;ℝm) weak topology.

Development of Drift Design Method of High-rise buildings considering Material Properties of Shear Walls and Design Variable Linking Strategy (RC 전단벽의 재료 물성과 부재 그룹핑을 고려한 고층건물 변위조절설계법 개발)

  • 서지현;박효선
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2004.04a
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    • pp.487-494
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    • 2004
  • Resizing techniques have been recognized as practical methods for drift design of high-rise building since sensitivity analysis and iterative structural analysis are not required in implementation. In the techniques, the amount of material of a memberin a building for resizing is determined in terms of cross-sectional areas and sectional inertia moments as design variables. In this study, five drift design methods are developed by considering design variable linking strategy and fomulating resizing algorithm in terms of material properties of shear walls as a design variable. The developed methods are applied to the drift design of 20-story frame-RC shear wall structure, and then evaluated in the view points of practicality and efficiency.

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An Economic Statistical Design of the EWMA Control Charts with Variable Sampling Interval (VSI EWMA 관리도의 경제적 통계적 설계)

  • 송서일;박현규;정혜진
    • Journal of Korean Society for Quality Management
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    • v.32 no.1
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    • pp.92-101
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    • 2004
  • Tris paper present an economic statistical design which have statistically constraints for the optimal design of an EWMA control charts with variable sampling interval. Cost function use that proposed by Lorenzen and Vance, and the optimal design parameters include the sample size, control limit width, sampling interval, EWMA weight value. Comparisons between VSI EWMA control charts optimal economic design and optimal economic statistical designs show the following fact. Although have demerits which are more costly than economic design, have merits which to detect shifts more efficiently and to improve statistical performance.

Computer Simulation for Design of Minimum Vibration Mount System in Variable Displacement Engine (可變기통 엔진에서의 最小振動 마운트系 設計를 위한 電算시뮬레이션)

  • 이종원;정경열;곽윤근
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.3
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    • pp.305-315
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    • 1986
  • Redesign of the mounting system to minimize vibration of a variable displacement engine through computer simulation is considered. A three degree of freedom model is established for an in-line four-cylinder automobile engine with a three point mounting system. The engine mount locations and angles, and isolator sizes are chosen as design parameters. Constraints on isolator deformations and design parameters are imposed. The gradient projection method is utilized for optimization. Simulation studies show significant vibration reduction can be obtained especially at idling speed.

Design of Membership Ranges for Robust Control of Variable Speed Drive Refrigeration Cycle Based on Fuzzy Logic (가변속 냉동사이클의 강인제어를 위한 퍼지로직의 멤버십함수 범위 설계)

  • Jeong, Seok-Kwon
    • Journal of Power System Engineering
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    • v.22 no.1
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    • pp.18-24
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    • 2018
  • This paper focuses on systematic design about the membership ranges of the main design factors such as control error, control error rate, and sampling time for the fuzzy logic control of the variable speed drive refrigeration cycle. The upper and the lowest limit of the membership ranges are set up from the data of static characteristics obtained by experiments. Three kinds of membership ranges on the control error and the control error rate are tested by experiments. Especially, an effect of sampling time on control performance is also investigated in the same way. Experimental data showed the control error rate and the sampling time strongly effected on the control performance of the refrigeration cycle with a variable speed drive.

Design and Performance Verification of Compound CVTs with 2K-H I type Differential Gear

  • Kim Yeon-Su;Park Jae-Min;Choi Sang-Hoon
    • Journal of Mechanical Science and Technology
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    • v.20 no.6
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    • pp.770-781
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    • 2006
  • This paper defined design constraints for the compound CVTs (continuously variable trans-missions) by combining power-circulation-mode CVTs and power-split-mode CVTs, which were proposed for connecting 2K-H I-type differential gear to V-belt-type CVU (Continuously Variable Unit). The design constraints are the necessary and sufficient conditions to avoid geometrical interferences among elements in the compound CVTs, and to guarantee smooth assembly between the power-circulation-mode CVT and power-split-mode CVT Two com-pound CVTs were designed and manufactured in accordance with the design constraints. With these compound CVTs, theoretical analysis and performance experiments were conducted. The results showed that the design constraints were valid and effective design method, and that the designed compound CVTs had the improved performance.

A Design Compensation for Stable Flow/Pressure Control of Variable Displacement Type Piston Pump (가변용량형 피스톤 펌프의 안정적인 유량/압력제어를 위한 설계보상)

  • Jung, Dong-Soo;Kim, Hyoung-Eui;Kang, E-Sok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.165-174
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    • 2007
  • Variable displacement type piston pump uses various controllers for controlling more than one state quantity like pressure, flow, power, and so on. These controllers need the mathematical model closely expressing dynamic behavior of pump for analyzing the stability of control systems which usually use various kinds of state variables. This paper derives the nonlinear mathematical model for variable displacement type piston pump. This model consists of two 1st oder differential equations by the continuity equations and one 2nd oder differential equation by the motion equation. To simplify the model we obtain the linear state variable model by differentiating the three nonlinear equations. And we verify this linearized model by comparison of simulation with experimentation and analyze the stability for the flow/pressure control. Finally this paper suggests the design compensation to ensure the stability of the systems.

A Study on the Suitable Number of the Exhaust Variable Valve Spring for Semi-active Muffler (반능동형 머플러의 배기가변밸브 스프링 적정상수에 관한 연구)

  • Park Se-Jong;Seo Ho-Chul;Son Sung-Man;Park Kyoung-Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5 s.182
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    • pp.137-142
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    • 2006
  • The muffler which reduce the exhaust noise and vibration from engine influence on the engine performance. Recently, exhaust variable valve has set up in the muffler controls the backpressure in the exhaust system. And the backpressure variation according to the exhaust variable valve opening has developed the engine performance. First, the preceding of structural analysis is needed and simulation experiment is requested for the study on the design factor to influence on the operation of the exhaust variable valve. In this study, setting up the various variables according to each composition element needed for the structural analysis of the exhaust variable valve, it is experimented the analysis on the influence of each design factor with the calculation of stress distribution and the displacement to cause about the backpressure for the valve through parameter study.