Related Experiment Video
Updated: Oct 8, 2025

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
Published on: June 13, 2023
Sliding mode control for offshore parallel antenna platform with large orientation workspace
Yuhang He1, Yaozhong Wu2, Weijia Li3
1School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China.
Abstract:
A novel sliding mode control strategy is proposed to solve the trajectory tracking control problem of an offshore antenna platform, which uses a Stewart-type parallel mechanism and has a large orientation workspace. To obtain comprehensive posture parameters of the offshore antenna platform, a posture compensation algorithm using the information of azimuth and elevation is proposed. Considering known limb lengths, a state observer which based on a super-twisting algorithm is presented to obtain limb velocities. To solve the trajectory-tracking control problem of the platform, a modified nonsingular terminal integral sliding mode controller is proposed. To reduce chattering, the sliding mode controller is equipped with a higher order super-twisting algorithm. The Lyapunov theory was used to prove its stability. Simulation results on a large-orientation workspace offshore antenna platform demonstrate its superiority over three other controllers. Compared with the traditional sliding mode controller with super-twisting algorithm, the integral of the squared error of the proposed control strategy is 49.49% lower.
Related Concept Videos
Impact Loading on a Cantilever Beam
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
Angular Momentum about an Arbitrary Axis
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
Unsymmetric Bending - Angle of Neutral Axis
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
Shear on the Horizontal Face of a Beam Element
Design Example: Traverse Angle Computations
Azimuths and Bearings

