scholarly journals MISSILE CONTROL DESIGN BASED ON THE LINEAR MULTIPLE SLIDING MODE RECURSIVE METHOD

2008 ◽  
Vol 49 (4) ◽  
pp. 573-587 ◽  
Author(s):  
Y. J. SHI ◽  
G. F. MA
Keyword(s):  
Critical State ◽  
Sliding Mode ◽  
Design Method ◽  
Control Design ◽  
Variable Structure ◽  
Structure Theory ◽  
Cruise Missile ◽  
Design Specification ◽  
High Attitude ◽  
Sliding Mode Variable Structure

AbstractTo ensure that the elevator of a cruise missile is operating within the design specification in high-attitude flight, we present a design method for the construction of a sliding mode recursive variable structure controller. In this design method, a target sliding mode surface is first designed without considering the engineering specification of the elevator. Secondly, by using this specification, the critical state is solved. Then, the transitional sliding mode surfaces are designed recursively by using the critical state of the previous sliding mode surface so that the state will move smoothly from one transitional sliding mode surface to the next until the target sliding mode surface. This design method is based on linear sliding mode variable structure theory. Thus, the controller obtained is simple in structure and practical. Furthermore, the elevator will operate within the engineering specification. The simulation results show the effectiveness of the proposed method.

Sensorless PMSM Control for Automobile Air-Condition Based on Sliding Mode Observer

2012 ◽  
Vol 241-244 ◽  
pp. 1964-1968
Author(s):  
Hua Bin Wang ◽  
Jin Liang Shi ◽  
Guo Rong Chen ◽  
Di Jian Xue
Keyword(s):  
Theoretical Foundation ◽  
Sliding Mode ◽  
Variable Structure ◽  
Mathematic Model ◽  
Position Estimation ◽  
Structure Theory ◽  
Static State ◽  
Rotor Position ◽  
Estimation Algorithms ◽  
Sliding Mode Variable Structure

The paper presents a review of the sensorless position estimation algorithms which are being adopted by Automobile Air-condition. After analyzing and introducing of the sliding mode variable structure theory and the mathematic model of PMSM, the control strategy based on SMO and its math expression are presented. The simulation model in MATLAB/SIMULINK is established, in which the real rotor position and the estimated rotor position calculated by SMO under dynamic and static state are analyzed. Besides, the principle of sliding gain selection is raised. The simulation provides the theoretical foundation.

A New Sliding Mode Observer for the Sensorless Control of a PMLSM

2014 ◽  
Vol 494-495 ◽  
pp. 1401-1404 ◽  
Author(s):  
Hua Cai Lu ◽  
Juan Ti ◽  
Lu Lu Sun ◽  
Li Sheng Wei
Keyword(s):  
High Speed ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Variable Structure ◽  
Sliding Mode Observer ◽  
Structure Theory ◽  
Switching Function ◽  
Sigmoid Function ◽  
Direct Drive ◽  
Sliding Mode Variable Structure

In order to achieve sensorless control for permanent magnet linear synchronous motor (PMLSM) direct drive system, speed and position of the motor must be estimated. A new high speed sliding mode observer (SMO) is proposed for a PMLSM based on the sliding mode variable structure theory. A Sigmoid function is used for the SMO as a switching function of the control law, eliminating sliding mode chattering and improving its response rate. Simulation results show that the proposed SMO based on Sigmoid function is capable of estimating speed and position of the motor accurately and rapidly, and the proposed PMLSM sensorless control system has a good dynamic response.

scholarly journals Synchronous Generator Rectification System Based on Double Closed-Loop Control of Backstepping and Sliding Mode Variable Structure

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1832
Author(s):  
Jinfeng Liu ◽  
Xin Qu ◽  
Herbert Ho-Ching Iu
Keyword(s):  
Closed Loop ◽  
Control Structure ◽  
Low Voltage ◽  
Sliding Mode ◽  
Variable Structure ◽  
Synchronous Generator ◽  
Closed Loop Control ◽  
High Current ◽  
Loop Control ◽  
Sliding Mode Variable Structure

Low-voltage and high-current direct current (DC) power supplies are essential for aerospace and shipping. However, its robustness and dynamic response need to be optimized further on some special occasions. In this paper, a novel rectification system platform is built with the low-voltage and high-current permanent magnet synchronous generator (PMSG), in which the DC voltage double closed-loop control system is constructed with the backstepping control method and the sliding mode variable structure (SMVS). In the active component control structure of this system, reasonable virtual control variables are set to obtain the overall structural control variable which satisfied the stability requirements of Lyapunov stability theory. Thus, the fast-tracking and the global adjustment of the system are realized and the robustness is improved. Since the reactive component control structure is simple and no subsystem has to be constructed, the SMVS is used to stabilize the system power factor. By building a simulation model and experimental platform of the 5 V/300 A rectification module based on the PMSG, it is verified that the power factor of the system can reach about 98.5%. When the load mutation occurs, the DC output achieves stability again within 0.02 s, and the system fluctuation rate does not exceed 2%.

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