Vibration Control of Rope-Sway of Elevator for High-Rise Building

2001 ◽  
Author(s):  
Masatsugu Otsuki ◽  
Ryohsuke Nakada ◽  
Kazuo Yoshida ◽  
Kosoku Nagata ◽  
Shigeru Fujimoto ◽  
...  
Keyword(s):  
Optimal Control ◽  
Control Method ◽  
Synthesis Method ◽  
Optimal Controller ◽  
Control Input ◽  
Time Varying ◽  
Object A ◽  
High Rise ◽  
High Rise Building ◽  
Kobe Earthquake

Abstract This study presents a synthesis method of a nonstationary optimal controller with a time-varying criterion function for reducing vibration of a time-varying object such as rope of elevator and crane. For time-varying object a stationary optimal control is little effective in reducing vibration. Hence, a nonstationary optimal control method with time-varying weightings on a control input and state values is applied to the time-varying object. As an illustration, the performance of reducing vibration with respect to the rope-sway problem on a high-rise building is examined through numerical calculation. Moreover, from the viewpoint of wave propagation, we propose a method of reducing vibration with wave-absorbing controller to remove the reflected waves. Finally, the performance of these nonstationary optimal and wave-absorbing controllers are compared with that of the stationary optimal controller for case that the structure is subjected to Kobe earthquake.

Design of an optimal preview controller for linear time-varying discrete systems in a multirate setting

2015 ◽  
Vol 13 (06) ◽  
pp. 1550050 ◽  
Author(s):  
Fucheng Liao ◽  
Yujian Guo ◽  
Yuan Yan Tang
Keyword(s):  
Optimal Control ◽  
Discrete System ◽  
Control Method ◽  
Linear Time ◽  
Discrete Systems ◽  
Control Input ◽  
Time Varying ◽  
Preview Control ◽  
Rate System ◽  
Error System

This paper is concerned with preview control problems for linear time-varying discrete systems in a multirate setting. First, by using the discrete lifting technique, the multirate time-varying discrete system is converted to a formal single-rate system. Then, by applying the standard linear quadratic (LQ) preview control method, we construct the expanded error system, and the optimal preview control model of the common time-varying discrete system is obtained. The optimal control input of the expanded error system is obtained by using the outcome of optimal control theory on time-varying systems. The controller with preview action is obtained when we transfer our conclusion into the original system. Finally, a numerical example is included to illustrate the validity of the proposed method.

Optimal Control of Clamped-Free Conical Shell Using Diagonal Piezoelectric Sensor and Actuator

2011 ◽  
Author(s):  
H. Li ◽  
Z. B. Chen ◽  
S. D. HU ◽  
H. S. Tzou
Keyword(s):  
Optimal Control ◽  
Conical Shell ◽  
Control Method ◽  
Time Derivative ◽  
Piezoelectric Sensor ◽  
Optimal Controller ◽  
Control Voltage ◽  
Modal Control ◽  
Control Input ◽  
Control Force

In this paper, optimal vibration control of a clamped-free conical shell is presented. A diagonal piezoelectric sensor/actuator (S/A) pair is proposed to control the axial, bending and transverse vibrations of the conical shell. The modal functions are adapted to satisfy the clamped-free boundary condition. Based on the independent modal control method, the response of conical shell to external excitations can be represented by the summation of all participating natural modes and their respective modal participation factors and each mode can be controlled independently. The modal equation is transformed into the linear state space form. The modal participation factor and its time derivative are chosen to be the state variables. The sensing signals are chosen to be the output vector. The modal force is chosen to be the control input vector. The linear quadratic (LQ) controllers are designed for each independent mode. The optimal gain matrix is related to the ratio between control voltage and sensing signal by the modal control force per unit voltage and the sensing signal. Numerical examples show that, the proposed optimal control method can achieve significant active control effects and the optimal gains are mainly related to the modal velocity. This effect varies with the locations of S/A pair and the mode of the shell. The results indicate that, to achieve the best control effects for all wanted modes, the optimal controller and the optimization of the S/A location should be taken into account in the design of the optimal controller.

scholarly journals Vibration Control for Rope-Sway of Elevator of High-Rise Building. Application of Nonstationary Optimal Control to Time-Varying Flexible System.

2002 ◽  
Vol 68 (676) ◽  
pp. 3589-3596 ◽  
Author(s):  
Masatsugu OTSUKI ◽  
Kazuo YOSHIDA ◽  
Kosoku NAGATA ◽  
Hiroyuki KIMURA ◽  
Toshiaki NAKAGAWA
Keyword(s):  
Optimal Control ◽  
Vibration Control ◽  
Time Varying ◽  
Flexible System ◽  
High Rise ◽  
High Rise Building

Air Suspension Optimal Control Based on the Genetic Algorithm

2011 ◽  
Vol 467-469 ◽  
pp. 1066-1071
Author(s):  
Zhong Xin Li ◽  
Ji Wei Guo ◽  
Ming Hong Gao ◽  
Hong Jiang
Keyword(s):  
Genetic Algorithm ◽  
Optimal Control ◽  
Dynamic Model ◽  
Control Method ◽  
Control Model ◽  
Weight Matrix ◽  
Object A ◽  
Full Vehicle ◽  
Air Suspension ◽  
Optimal Control Method

Taking the full-vehicle eight-freedom dynamic model of a type of bus as the simulation object , a new optimal control method is introduced. This method is based on the genetic algorithm, and the full-vehicle optimal control model is built in the MatLab. The weight matrix of the optimal control is optimized through the genetic algorithm; then the outcome is compared with the artificially-set optimal control simulation, which shows that the genetic-algorithm based optimal control presents better performance, thereby creating a smoother ride and improving the steering stability of the vehicle.

A Nonlinear Optimal Control Approach for the Vertical Take-off and Landing Aircraft

2021 ◽  
pp. 2150012
Author(s):  
G. Rigatos
Keyword(s):  
Optimal Control ◽  
Control Method ◽  
Nonlinear Optimal Control ◽  
The Body ◽  
Algebraic Riccati Equation ◽  
Control Input ◽  
Time Step ◽  
Control Approach ◽  
Vtol Aircraft ◽  
Optimal Control Approach

The paper proposes a nonlinear optimal control approach for the model of the vertical take-off and landing (VTOL) aircraft. This aerial drone receives as control input a directed thrust, as well as forces acting on its wing tips. The latter forces are not perpendicular to the body axis of the drone but are tilted by a small angle. The dynamic model of the VTOL undergoes approximate linearization with the use of Taylor series expansion around a temporary operating point which is recomputed at each iteration of the control method. For the approximately linearized model, an H-infinity feedback controller is designed. The linearization procedure relies on the computation of the Jacobian matrices of the state-space model of the VTOL aircraft. The proposed control method stands for the solution of the optimal control problem for the nonlinear and multivariable dynamics of the aerial drone, under model uncertainties and external perturbations. For the computation of the controller’s feedback gains, an algebraic Riccati equation is solved at each time-step of the control method. The new nonlinear optimal control approach achieves fast and accurate tracking for all state variables of the VTOL aircraft, under moderate variations of the control inputs. The stability properties of the control scheme are proven through Lyapunov analysis.

Fractional-Order Optimal Control of Fractional-Order Linear Vibration Systems with Time Delay

2018 ◽  
Vol 7 (3) ◽  
pp. 72-93
Author(s):  
Saeed Balochian ◽  
Nahid Rajaee
Keyword(s):  
Optimal Control ◽  
Time Delay ◽  
Fractional Order ◽  
Control Method ◽  
Linear Structure ◽  
Control Input ◽  
Linear Vibration ◽  
Order Linear ◽  
Input Control ◽  
Delayed System

Vibration control of fractional-order linear systems in the presence of time delays has been dealt in this article. Considering a delayed n-degree-of freedom linear structure that is modeled by fractional order equations, a fractional-order optimal control is provided to minimize both control input and output of delayed system via quadratic objective function. To do this, first the fractional order model of system that is subject to time delay is rewritten into a non-delay form through a particular transformation. Then, a fractional order optimal controller is provided using the classical optimal control theory to find an optimal input control. A delayed viscose system is then presented as a practical worked-out example. Numerical simulation results are given to confirm the efficiency of the proposed control method.

Study on Concrete Construction Technology of High-Rise Building

2015 ◽  
Vol 730 ◽  
pp. 93-96
Author(s):  
Ya Guo
Keyword(s):  
Control Method ◽  
Construction Method ◽  
Construction Technology ◽  
Construction Site ◽  
Practical Application ◽  
Concrete Construction ◽  
High Rise ◽  
High Rise Building ◽  
Key Points ◽  
Technical Measures

This paper introduces the features and key points of construction of high-rise buildings. Combined with the practical application, the technology of concrete construction is put forward, as well as the control method of concrete pouring quality. According to the specific conditions of construction site, the construction method of foundation from shallow to deep is adapted. The different placement scheme and technical measures are made.

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