Particle Swarm Algorithm Sliding Mode Control on Spacecraft’s Attitude with Switching Function Method Thorough Error Feedback

H B Hassrizal,Siti Marhainis Othman,M N Ayob,J A Rossiter

doi:10.1088/1757-899x/705/1/012039

Abstract

Small spacecraft requires capable processors with energy efficiency, low cost and low computational burden while maintaining the output tracking accuracy. This paper presents the extension of work in [1], to enhance the transient performance using particle swarm optimization (PSO) on decaying boundary layer and switching function thorough error feedback (DBLSF) in Sliding Mode Control (SMC). Generally, SMC is known for having chattering as the main drawback which can introduce wear and tear to moving mechanical parts. As a solution, a DBLSF proposed in [1] and capable of eliminating the chattering in SMC while considering the essential requirements for small spacecraft operation. Then, the extension implemented on spacecraft’s attitude, which is one-of-six subsystems in spacecraft, used to orient the spacecraft referred to reference objects and control the dynamics of a spacecraft time-to-time according to the needs. However, the SMC’s transient response can be tuned using some coefficients in the SMC algorithm. The parameters in [1] were tuned using outputs observation technique. In this paper, then, an improvement is introduced to optimize the outputs by adding a PSO in the SMC-DBLSF in term of transient performances and accuracy while reducing the chattering permanently.

Highlights

A spacecraft or satellite is an object that is orbiting larger objects such as the earth
Since Sliding Mode Control (SMC) and particle swarm optimization (PSO) sharing similar important specifications, the combination of the PSO-DBLSF is suitable to implement on small spacecraft operation
The detailed summary for both observations in term of the outputs accuracy comparison and transient characteristics between the DBLSF and the PSO-DBLSF is shown in Table 4 and Table 5

Summary

Introduction

A spacecraft or satellite is an object that is orbiting larger objects such as the earth. A boundary layer technique is one of the most popular methods for chattering elimination in SMC. A constant boundary layer (CBL) introduced by the researchers, but the control output accuracy cannot be maintained [10]. A decaying boundary layer and switching function thorough error feedback (DBLSF) is proposed in [1] to eliminate the chattering while maintaining the accuracy outputs. In this paper, a particle swarm optimization (PSO) is introduced to the DBLSF to improve the small spacecraft attitude and orientation (SAOM) transient performance. Since SMC and PSO sharing similar important specifications (simple mathematical operators, required low computational load and inexpensive), the combination of the PSO-DBLSF is suitable to implement on small spacecraft operation.

Spacecraft’s Attitude and Orientation Model around Earth

Sliding Mode Control

Results

Conclusions and Future Recommendations