Last. Chuanyu Wu(ZSTU: Zhejiang Sci-Tech University)H-Index: 9
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Abstract This study proposes a lever-type vibration isolator with eddy current damping (LVI-ECD), which can broaden the isolation band by adjusting the lever ratio and improve the vibration suppression performance with eddy current damping (ECD). The LVI-ECD composes of a lever with a permanent magnet (PM) at the tip of the lever, a load plate, a base plate and springs, etc. The relative motion between the PM and the conductive base and load plates induces ECD, which can be amplified by the leve...
Last. Xiaojian Wang(SJTU: Shanghai Jiao Tong University)H-Index: 1
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Abstract A high-static-low-dynamic stiffness (HSLDS) isolator using cam-roller-spring mechanism with a specially designed cam profile is proposed in this study. The proposed HSLDS isolator is mainly composed of a cam-roller mechanism (negative mechanism) and a vertical spring (positive mechanism). Different from other studies, the cam profile in this paper can be designed specially to accommodate different working requirements. Firstly, the cam design theory is described and a cam whose force-di...
Last. Li-Qun Chen(SHU: Shanghai University)H-Index: 51
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Abstract With the increasing of the accuracy requirement of data record for on-orbit instruments, it becomes a greater challenge and brings more opportunities in design of observing spacecraft to isolate micro-vibrations of low frequency and ultra-low frequency. By imitating both multi-vertebra structure of bird’s neck and gazing stability of head, a multi-layer quasi-zero stiffness (QZS) nonlinear isolator is investigated in this paper. The mathematical model with high-order coupled nonlinear o...
Abstract This paper proposes a bio-inspired semi-active vibration isolator with the dielectric elastomer based variable stiffness element for the vibration suppression of the free-floating spacecraft. A theoretical model for the dielectric elastomer stiffness is developed and validated by the experimental data. The parametric dependence of the mechanical stiffness on the applied voltage, pre-stretch of the elastomer and dielectric material properties is analyzed. The approximate analytical solut...
#1Chaoran Liu(HIT: Harbin Institute of Technology)H-Index: 5
#2Kaiping Yu(HIT: Harbin Institute of Technology)H-Index: 17
Last. Jie Tang(Southwest Jiaotong University)H-Index: 4
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Abstract A typical quasi-zero-stiffness (QZS) vibration isolator composed of two lateral springs and a vertical spring has been widely studied in previous literature, in which the dynamic equation is usually formulated with linear viscous damping. However, in practical applications, the damping may be generated from many sources and thus deserves special study. In this paper, a dynamic model with consideration of three main damping generation mechanisms is established to give further insights in...
Abstract Electromagnetic shunt damping (EMSD) can effectively suppress structural vibrations of linear systems. However, the effects of EMSD on shock isolation for either linear or nonlinear vibration systems have not been studied deeply. This paper investigates the shock isolation of nonlinear vibration isolators (NVIs) with negative resistance electromagnetic shunt damping (NR-EMSD). An NVI that is capable of realizing linear and nonlinear characteristics is constructed. The coupled governing ...
Last. Xiaokui Yue(NPU: Northwestern Polytechnical University)H-Index: 12
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Abstract On-orbit capture of non-cooperative targets, i.e., malfunctioning satellites and space debris, is nowadays an urgent task. It is also a challenging task since the states of the non-cooperative targets are essentially unknown and have to be estimated by real-time visual detection. In the final approach stage, inevitable time-delay and measurement errors of the visual detection may cause a sudden impact between the servicing spacecraft and target, which can make the spacecraft unstable or...
Last. Wen-Ming Zhang(SJTU: Shanghai Jiao Tong University)H-Index: 35
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Abstract Quasi-zero stiffness (QZS) is beneficial for low-frequency vibration isolation. However, most isolators based on QZS have a small working stroke and a limited load capacity, which hinders applications in many environments. Here, a large stroke QZS vibration isolator using three-link mechanisms (TLMs) is proposed. We design a symmetric polygon structure consisting of two three-link structures which exhibits a linear negative stiffness with large displacement. Then, the quasi-zero stiffne...
Last. Shilin Xie(Xi'an Jiaotong University)H-Index: 15
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Abstract To improve the passive control effect on low frequency micro-vibration of structures with high static support stiffness, this paper proposed a high-static-low-dynamics stiffness vibration isolator (HSLDs-VI). This device is equipped with a magnetic negative stiffness mechanism that can provide high magnetic negative stiffness to counteract high static stiffness. The magnetic mechanism is composed of a magnetic spring with negative stiffness (MS-NS) based on variable reluctance stress. I...
Last. Wen-Ming Zhang(SJTU: Shanghai Jiao Tong University)H-Index: 35
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Inspired by the safe landing of a cat falling from a high altitude, a bio-inspired polygonal skeleton (BIPS) structure is proposed, and its nonlinear characteristics are systematically studied to explore its potential application in the suppression of vibration. The polygon is formed by the skeleton structure of the cat’s entire body and the ground. The BIPS system consists of two symmetrical bionic legs with three robs (as skeleton) and four horizontal springs (as muscle). Two bionic legs are c...
Last. Wen-Ming Zhang(SJTU: Shanghai Jiao Tong University)H-Index: 35
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Abstract null null Inspired by the cushioning effect of the felid paws in contact with the ground, a novel bio-inspired toe-like structure (TLS) is developed and systematically studied for low-frequency vibration isolation. The TLS consists of two rods with different length (as phalanxes) and a linear spring (as muscle). Based on Hamiltonian principle, the dynamic model is established considering spring deformation and joint rotation damping. The derived equivalent stiffness reveals that the pro...
Structural vibrations seriously affect the working performance of and even cause fatal hazards in host structures. The use of a metamaterial is a novel way to suppress structural vibrations across a wide frequency band. This paper presents an enhanced dual-resonator metamaterial beam (DRMB), where the free end of a traditional series dual-resonator is periodically connected to the rigid body with a spring. The mass and frequency response of the enhanced dual-resonator is derived. The theoretical...