Design, analysis and experimental investigation on the whole-spacecraft vibration isolation platform with magnetorheological dampers

Abstract

Satellites are subject to complex loads during launch, and harsh vibration environments often result in failures in launching satellites or damage to on-board instruments. A six-degree-offreedom conical vibration isolation platform with magnetorheological dampers has been proposed, which is highly integrated and used to partially replace the original connection device to improve the vibration environment. A mathematical model of the vibration isolation platform with rigid payload is established and natural frequencies are solved. On the other hand, a dynamic model of the vibration isolation system including the flexible satellite is established by using dynamic software, and modal analysis and vibration analysis are carried out. The first six natural frequencies of the system obtained by simulation are close to the results of the model solution. Finally, the test platform is built and the ground vibration tests are conducted, and a well-known semi-active control approach called Skyhook is implemented. The test results are in good agreement with the simulation results of the vibration analysis, and the designed vibration isolation system has much better vibration isolation performance than the original system.

Controllability analysis and intelligent control of magnetorheological whole-satellite under small amplitude and medium-high frequency vibration

“…The results show that compared with passive vibration isolation, MR semi-active vibration isolation can achieve better vibration reduction effect in a wide frequency range. Cheng et al (2019) conducted a similar study and showed that MR technology can reduce the satellite centroid vibration, while an interesting phenomenon was found that the acceleration transmissibility first decreases and then increases as the current increases. Nowadays, there are still very few public reports on MR whole-satellite vibration isolation research.…”

Active vibration hybrid control strategy based on multi-DOFs piezoelectric platform

“…Building a feedback control loop is a simple and efficient method that has been widely used in active vibration control (Cheng et al, 2019; Ma et al, 2022; Qian et al, 2022; Sharma et al, 2019). To reduce the main and super harmonic resonance of a flexible simple beam, Liu et al (2016) proposed an optimal delay feedback control method with a piezoelectric sensor and driver.…”

Experimental investigation on a new sensitive payload platform with simultaneous positioning and vibration suppression capabilities

“…As a result, image jitter is generated which could reduce the observation quality, even cause the observation task failure. Therefore, it is necessary to suppress the disturbances during positioning (Jian et al, 2018; Kamesh et al, 2012), especially the low-frequency vibrations and middle-high-frequency vibrations (Cheng et al, 2019; Wang et al, 2019). However, an awkward question is that even the scheme with series connection of a positioning platform and a vibration suppression platform could track the target and suppress the external disturbance well; the large size and mass, as well as the difficulty of collaborative control, all bring inconvenience to the on-orbit application.…”