Journal
MEASUREMENT
Volume 185, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2021.110046
Keywords
Variable stiffness; Bionic joint; Non-linear spring; Quasi-zero stiffness; Precision measurement equipment
Funding
- National Natural Science Foundation of China [51875092]
- National Key Research and Development Project of China [2020YFB2007802]
- Natural Science Foundation of Ningxia Province [2020AAC03279]
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The newly proposed vibration isolation joint combines positive and negative stiffness, supports multi-directional stiffness adjustment, and changes structural stiffness by altering the effective length of the beam. It provides good passive low-frequency vibration isolation performance and enables active control of ultra-low frequency vibration isolation by actively changing the structural stiffness.
A new vibration isolation joint with combined positive and negative stiffness is proposed, which also supports multi-directional stiffness adjustment. Two sets of opposed buckling Euler beams are used as the variable stiffness structure. The effective length of the beam is changed by moving the slider, which in turn changes the structural stiffness. In the horizontal direction the structure provides adjustable positive stiffness. In the vertical direction it can provide adjustable negative or positive stiffness. A disk spring with nonlinear stiffness characteristics is used as the load-bearing spring and is connected in parallel with the variable stiffness structure. The static and dynamic characteristics show that the structure has good passive low-frequency vibration isolation performance. By actively moving the slider to change the structural stiffness, the equilibrium position of the system can be changed, active actuation can be performed, and active control of ultra-low frequency vibration isolation can be achieved.
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