Track-position and vibration control simulation for strut of the Stewart platform

Abstract

Abstract:Vibrations inherently generated by on-board disturbance sources degrade the performance of the instruments in an on-orbit spacecraft, which have stringent accuracy requirements. The Stewart platform enables both track-positioning and vibration control. The strut of the Stewart platform is designed as a piezoelectric (PZT) element in series with a voice coil motor (VCM) element and a viscoelastic element. The track-positioning system uses a VCM as the main positioning control driver and a PZT as the positioning compensator. The vibration control system uses the characteristics of struts including active and passive control elements to attenuate the vibration. Simulation results indicate that the Stewart platform with the designed struts has good performance in tracking and vibration attenuation with different interference waves.

Progress of Stewart Vibration Platform in Aerospace Micro–Vibration Control

“…It can be used as a connecting device between high-precision space-borne equipment and the spacecraft body to suppress micro-vibrations [13]. At the same time, it is also widely used in motion simulation [24][25][26][27], industrial manufacturing [23,28], mechanical docking [25,29,30], micro-vibration control [31][32][33], and medical assistance [34][35][36].…”

Seguimento de Referências Senoidais em Atuadores Eletromagnéticos Lineares Tubulares

“…O seguimento de referências senoidais de posiçãoé um tópico de grande interesse acadêmico e industrial pelo fato de estar associadoà diversas aplicações. Pode-se encontrar exemplos dessas aplicações em servomecanismos que trabalham com sinais periódicos (Mahawan and Luo, 2000), aplicações com frequência variável como acionamento de bombas (Lin and Ting, 2019), posicionamento de radares e aplicações com trajetórias repetitivas utilizadas em fabricação de semicondutores ou dispositivos industriais com dois graus de liberdade (Lin and Lin, 2002), trabalhos com nanomanipuladores biológicos, sistemas de microscopiaótica e manipulação de células (Liu et al, 2018;Zhu et al, 2018), e em plataformas marítimas para exploracão de gás eóleo, onde são desenvolvidas plataformas de Stewart com controladores para rejeição de perturbação harmônica causada por ondas do mar e controle de vibrações (Horoub et al, 2018;Xu and Weng, 2013). Em muitas destas aplicações, os requisitos de controle buscam um bom desempenho do sistema associado ao seguimento de referências de posição em regime permanente.…”

Micro-Vibration Control for Ultra-Precision Isolation Platform of Large Grating Ruling Engine

“…So it is necessary to consider the complex external disturbance, not only coming from the ground vibrations, but also the movement of the grating ruling machine. The vibration frequency generated by earth pulse is less than 1Hz, from 1 to 3 Hz by the movement of laboratory staff, from 6 to 65 Hz by the motor, and from 10 to 100 Hz by self-excitation vibration of the building [1]. Therefore, there are very strict requirements on vibration isolation, not only for high frequency interference, but also for low and super-low frequency vibration.…”