Control Strategy of Coiling Tension Based on RBF-NN Inverse System

2012 ◽  
Vol 503-504 ◽  
pp. 1276-1279
Author(s):  
Chao Wei Duan ◽  
Chao Zhang
Keyword(s):  
Control Strategy ◽  
Control Process ◽  
Inverse System ◽  
Tension Control ◽  
System Control ◽  
Rbf Neural Networks ◽  
Indirect Control ◽  
Constant Tension ◽  
Coiling Tension ◽  
Control Accuracy

Based on the study of coiler tension indirect control process, the purpose is to improve the control accuracy of the constant tension by the introduction of RBF neural networks and inverse system control theory. Depending on the physical characteristic of coiling tension control process, it could build the inverse system model for coiling tension control. By analyzing simulation results, this control strategy has great significance to the actual production.

Inherently Safe Design of Home Elevator System by Passive Dynamic Control

2007 ◽  
Author(s):  
Y. Minamiyama ◽  
T. Kiyota ◽  
N. Sugimoto
Keyword(s):  
Control Method ◽  
Dynamic Control ◽  
Control Process ◽  
Constant Load ◽  
System Control ◽  
Cost Performance ◽  
Remote Areas ◽  
Power Failure ◽  
Constant Tension ◽  
Small Force

The passive dynamic control (“PDC”) is a new mechanical system control method requiring less energy but ensuring higher safety, which is based on inherently safe design using variable passive elements. The PDC divides its control process into four steps: hold step, take-over step, unbalance step and free step. In each of these steps, it is confirmed that the next step has satisfied the inherently safe design and then the execution of the next step is permitted. In this study, the authors have developed a PDC balancer equipped with a constant-load spring balancer to provide a constant tension regardless of the wire elongation, and conducted positioning experiments using this PDC balancer. This paper proposes a new home elevator system using the PDC balancer. When the balance of the elevator is maintained by using the PDC balancer, the elevator can be moved by a small force. Even if power failure occurs or severance is caused to the spring of the PDC balancer, as long as the cage of the elevator is so mechanically arranged as to ascend in such case, impact on the passengers will be mitigated to be smaller than impact when it descends. Furthermore, this elevator is so designed as to prevent the passengers from being confined in the cage. The inherently safe design can be realized by multiplying the spring structure and employing the PDC for this system. This system is featured by its excellence in safety, energy saving and cost performance. If this system is realized, the home elevator can be used even in remote areas, which is expected to facilitate the spread of the home elevator.

Control System of Tension Test for Spring Fan Wheel Assembly

2013 ◽  
Vol 423-426 ◽  
pp. 2805-2808
Author(s):  
Kun Qi Wang ◽  
Chen Cong Meng ◽  
Ping Li ◽  
Jing Qi Fan
Keyword(s):  
Control System ◽  
Control Process ◽  
Tension Control ◽  
Steel Cable ◽  
Modular Software ◽  
Logic Control ◽  
Constant Tension ◽  
Tension Control System ◽  
Tension Loading ◽  
Testing Spring

This design is a basic method for testing spring fan wheel assembly and steel cable tension control system. PLC is used as logic control core. Stepping motor and magnetic powder braker is used as an executive element. The constant tension control of the running process of the system is completed. The fuzzy control process of PID system includes two parts of tension loading and damping loading. The method of modular software is used to make the program structure clear.

Research on Unwinding Tension System Control Based on Inverse System Theory

2010 ◽  
Vol 44-47 ◽  
pp. 2822-2826
Author(s):  
Jian Li ◽  
Xue Song Mei ◽  
Shan Hui Liu
Keyword(s):  
System Theory ◽  
Control System ◽  
Pid Controller ◽  
Control Variable ◽  
Active Damping ◽  
Inverse System ◽  
Tension Control ◽  
System Control ◽  
The Stability ◽  
Tension Control System

In the printing process, it mainly depends on the stability of systematic tension control to ensure the quality of print. Meanwhile, systematic tension is mainly created from unwinding section, from which it is easy to cause fluctuation and variation of tension. Hence, how to maintain the stability of the tension in unwinding system has become a key problem to tension control system. Unwinding system is a typical multi-input-multi-output, nonlinear and strong coupling system. It is difficult to control with the traditional design method. In this paper, we realize the system’s decoupling and linearization based on the inverse system theory, which make the system change from a coupled and nonlinear system to two order pseudo-linear systems after a series of control variable transformations. We introduce active-damping into the pseudo-linear system to overcome the zero-damping and enhance the ability of disturbance-resist. On the basis of these, a PID controller is designed for the unwinding tension control system. Though simulation and analysis, it shows that the proposed strategy of inverse system decoupling control can achieve the decoupling unwinding control system, and the PID controller which is designed after introducing the active-damping makes the system get an ideal control effect.

Towards a new design with generic modeling and adaptive control of a transformable quadrotor

2021 ◽  
pp. 1-31
Author(s):  
S.H. Derrouaoui ◽  
Y. Bouzid ◽  
M. Guiatni
Keyword(s):  
Adaptive Control ◽  
Control Strategy ◽  
Experimental Tests ◽  
Generic Model ◽  
System Control ◽  
System A ◽  
Viable Solution ◽  
Generic Modeling ◽  
Adaptive Control Strategy ◽  
The Stability

Abstract Recently, transformable Unmanned Aerial Vehicles (UAVs) have become a subject of great interest in the field of flying systems, due to their maneuverability, agility and morphological capacities. They can be used for specific missions and in more congested spaces. Moreover, this novel class of UAVs is considered as a viable solution for providing flying robots with specific and versatile functionalities. In this paper, we propose (i) a new design of a transformable quadrotor with (ii) generic modeling and (iii) adaptive control strategy. The proposed UAV is able to change its flight configuration by rotating its four arms independently around a central body, thanks to its adaptive geometry. To simplify and lighten the prototype, a simple mechanism with a light mechanical structure is proposed. Since the Center of Gravity (CoG) of the UAV moves according to the desired morphology of the system, a variation of the inertia and the allocation matrix occurs instantly. These dynamics parameters play an important role in the system control and its stability, representing a key difference compared with the classic quadrotor. Thus, a new generic model is developed, taking into account all these variations together with aerodynamic effects. To validate this model and ensure the stability of the designed UAV, an adaptive backstepping control strategy based on the change in the flight configuration is applied. MATLAB simulations are provided to evaluate and illustrate the performance and efficiency of the proposed controller. Finally, some experimental tests are presented.

Longitudinal and lateral collision avoidance control strategy for intelligent vehicles

2021 ◽  
pp. 095440702110240
Author(s):  
Ziyu Zhang ◽  
Chunyan Wang ◽  
Wanzhong Zhao ◽  
Jian Feng
Keyword(s):  
Real Time ◽  
Collision Avoidance ◽  
Decentralized Control ◽  
Control Strategy ◽  
Centralized Control ◽  
Lateral Control ◽  
Time Performance ◽  
Collision Avoidance Control ◽  
Avoidance Control ◽  
Control Accuracy

In order to solve the problems of longitudinal and lateral control coupling, low accuracy and poor real-time of existing control strategy in the process of active collision avoidance, a longitudinal and lateral collision avoidance control strategy of intelligent vehicle based on model predictive control is proposed in this paper. Firstly, the vehicle nonlinear coupling dynamics model is established. Secondly, considering the accuracy and real-time requirements of intelligent vehicle motion control in pedestrian crossing scene, and combining the advantages of centralized control and decentralized control, an integrated unidirectional decoupling compensation motion control strategy is proposed. The proposed strategy uses two pairs of unidirectional decoupling compensation controllers to realize the mutual integration and decoupling in both longitudinal and lateral directions. Compared with centralized control, it simplifies the design of controller, retains the advantages of centralized control, and improves the real-time performance of control. Compared with the decentralized control, it considers the influence of longitudinal and lateral control, retains the advantages of decentralized control, and improves the control accuracy. Finally, the proposed control strategy is simulated and analyzed in six working conditions, and compared with the existing control strategy. The results show that the proposed control strategy is obviously better than the existing control strategy in terms of control accuracy and real-time performance, and can effectively improve vehicle safety and stability.

Decoupling Control for Unwinding Tension Control Systems

2012 ◽  
Vol 262 ◽  
pp. 367-371
Author(s):  
Min Bian ◽  
Mei Yang
Keyword(s):  
Control Systems ◽  
Strong Coupling ◽  
Control Process ◽  
Tension Control ◽  
Decoupling Control ◽  
Driver Model ◽  
Control Performance ◽  
Printing Quality ◽  
Simulation Results ◽  
And Control

During the printing process, invariable tension is very important to make sure the high printing quality. It’s well known that the relation of tension and tape velocity is strong-coupling based on the model of tension control, the modeling of tension possesses varies a lot in the control process, and various disturbances are inevitable during printing. All of these make the tension control systems unstable and affect the printing quality. This paper purposes a method to decrease the strong-coupling relation between speed and tension and control the speed-tension accurately. Based on the shaft-less printing press, the unwinding tension model and servo driver model are given. Decoupling controller is designed in this paper, and simulation results show that this method can improve the coupling degree and control performance.

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