scholarly journals Residual vibration reduction in back-and-forth moving systems driven by slider-crank mechanisms working through a dead point configuration

2021 ◽  
Vol 158 ◽  
pp. 104239
Author(s):  
Joaquim M. Veciana Fontanet ◽  
Lluïsa Jordi Nebot ◽  
Eduard Lores Garcia
Keyword(s):  
Vibration Reduction ◽  
Residual Vibration ◽  
Point Configuration ◽  
Working Through

Friction-Compensating Command Shaping for Vibration Reduction

2004 ◽  
Vol 127 (4) ◽  
pp. 307-314 ◽  
Author(s):  
Jason Lawrence ◽  
William Singhose ◽  
Keith Hekman
Keyword(s):  
Steady State ◽  
Coulomb Friction ◽  
Vibration Reduction ◽  
Input Shaping ◽  
Residual Vibration ◽  
Command Shaping ◽  
Point Motion ◽  
Common Operation ◽  
Point To Point ◽  
Theoretical Developments

Fast and accurate point-to-point motion is a common operation for industrial machines, but vibration will frequently corrupt such motion. This paper develops commands that can move machines without vibration, even in the presence of Coulomb friction. Previous studies have shown that input shaping can be used on linear systems to produce point-to-point motion with no residual vibration. This paper extends command-shaping theory to nonlinear systems, specifically systems with Coulomb friction. This idea is applied to a PD-controlled mass with Coulomb friction to ground. The theoretical developments are experimentally verified on a solder cell machine. The results show that the new commands allow the proportional gain to be increased, resulting in reduced rise time, settling time, and steady-state error.

Residual Vibration Reduction Using Vector Diagrams to Generate Shaped Inputs

1994 ◽  
Vol 116 (2) ◽  
pp. 654-659 ◽  
Author(s):  
W. Singhose ◽  
W. Seering ◽  
N. Singer
Keyword(s):  
Natural Frequency ◽  
Upper Bound ◽  
Vibration Amplitude ◽  
Damping Ratio ◽  
Vibration Reduction ◽  
System Model ◽  
Input Shaping ◽  
Flexible Systems ◽  
Residual Vibration ◽  
Performance Predictions

This paper describes a method for limiting vibration in flexible systems by shaping the input to the system. Unlike most previous input shaping strategies, this method does not require a precise system model or lengthy numerical computation; only estimates of the system natural frequency and damping ratio are required. The effectiveness of this method when there are errors in the system model is explored and quantified. Next, an algorithm is presented, which, given an upper bound on acceptable residual vibration amplitude, determines a shaping strategy that is insensitive to errors in the estimate of the natural frequency. Finally, performance predictions are compared to hardware experiments.

scholarly journals Multi-degree-of-freedom vibration reduction strategy of the solar array drive system

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110154
Author(s):  
Zhu Shi-Yao ◽  
Li Dong-Xu ◽  
Lei Yong-Jun
Keyword(s):  
Dynamic Characteristics ◽  
Virtual Work ◽  
Vibration Reduction ◽  
Drive System ◽  
Degree Of Freedom ◽  
Solar Array ◽  
Residual Vibration ◽  
Reduction Strategy ◽  
Attitude Stability ◽  
Equivalent Damping

The operation disturbance induced by the solar array drive system (SADS) and the residual vibration of solar array following the attitude adjustment of the spacecraft obviously affect the dynamics environment, quick stabilization, and attitude stability of the high-precision spacecraft. However, these two kinds of vibration disturbance are characterized by distinct vibration categories, direction of vibration, and modal shapes. A multi-degree-of-freedom vibration reduction strategy (VRS) was presented to improve the dynamic characteristics of SADS and then to weaken these disturbances synthetically in this paper. SADS applying this VRS was modeled based on the virtual work principle, and the influence of the stiffness and damping parameters of this VRS on the SADS dynamic characteristics was analyzed. Then a prototype of vibration reduction device (VRD) was designed and verified by disturbance characteristic and modal experiments. The results indicate that the equivalent stiffness of VRD is critical to the natural frequency of SADS and thus should be carefully deliberated to avoid resonance. The equivalent damping of VRD always has positive correlation with modal damping. A good performance up to 40% in terms of operation disturbance suppression and a greater than 56% decrease of the damping time for 99% residual vibration have been obtained.

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