Optimum design and performance evaluation of the tuned inerter-negative-stiffness damper for seismic protection of single-degree-of-freedom structures

2021 ◽  
pp. 106805
Author(s):  
Hao Wang ◽  
Hui Gao ◽  
Jian Li ◽  
Zhihao Wang ◽  
Youhao Ni ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Optimum Design ◽  
Degree Of Freedom ◽  
Negative Stiffness ◽  
Seismic Protection ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
And Performance

Demonstrator to show the effects of negative stiffness on the natural frequency of a simple oscillator

2008 ◽  
Vol 222 (7) ◽  
pp. 1189-1192 ◽  
Author(s):  
A Carrella ◽  
M J Brennan ◽  
T P Waters
Keyword(s):  
Free Vibration ◽  
Natural Frequency ◽  
Degree Of Freedom ◽  
Negative Stiffness ◽  
Test Rig ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Horizontal Beam ◽  
Additional Correction

This article describes a demonstrator to show the effects of negative stiffness on the free vibration of a simple oscillator. The test rig consists of a horizontal beam that is hinged at one end and is supported by two coil springs to form a single-degree-of-freedom system. Additional correction springs, which provide negative stiffness, can be attached to lower the natural frequency of the system. The effect of the change in natural frequency can be easily seen visually, and it is shown that for one of the configurations of correction springs, the natural frequency can be reduced by a factor of about 4.

A Modular-Type Three-Axis Vibration Isolation System Using Negative Stiffness

2010 ◽  
Author(s):  
Md. Emdadul Hoque ◽  
Takeshi Mizuno ◽  
Yuji Ishino ◽  
Masaya Takasaki
Keyword(s):  
Vibration Isolation ◽  
Degree Of Freedom ◽  
Experimental Results ◽  
Negative Stiffness ◽  
Isolation System ◽  
Single Degree Of Freedom ◽  
Vibration Isolation System ◽  
Single Degree ◽  
In Series ◽  
Isolation Systems

A vibration isolation system is presented in this paper which is developed by the combination of multiple vibration isolation modules. Each module is fabricated by connecting a positive stiffness suspension in series with a negative stiffness suspension. Each vibration isolation module can be considered as a self-sufficient single-degree-of-freedom vibration isolation system. 3-DOF vibration isolation system can be developed by combining three modules. As the number of motions to be controlled and the number of actuators are equal, there is no redundancy in actuators in such vibration isolation systems. Experimental results are presented to verify the proposed concept of the development of MDOF vibration isolation system using vibration isolation modules.

Loop Shaping for Transparency and Stability Robustness in Time-Delayed Bilateral Telemanipulation

2004 ◽  
Vol 126 (3) ◽  
pp. 650-656 ◽  
Author(s):  
Kevin B. Fite and ◽  
Michael Goldfarb ◽  
Angel Rubio
Keyword(s):  
Time Delay ◽  
Communication Channels ◽  
Smith Predictor ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Stability Robustness ◽  
Loop Shaping ◽  
And Performance ◽  
Control Methodology

This paper presents a control methodology that provides transparency and stability robustness in bilateral telemanipulation systems that include a significant time delay in the communication channels. The method utilizes an adaptive Smith predictor to compensate for the time delay, and incorporates a previously published loop shaping approach to design a compensator for transparency and stability robustness of the loop. The method is experimentally demonstrated on a single degree-of-freedom telemanipulation system, and is shown to effectively provide stability and performance robustness.

Dynamic Analysis and Optimization of Tensioner in Automotive Serpentine Belt Drive Systems

2002 ◽  
Author(s):  
Mostafa Nouri ◽  
Jean W. Zu
Keyword(s):  
Optimum Design ◽  
Harmonic Excitation ◽  
Degree Of Freedom ◽  
System Component ◽  
Belt Drive ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Serpentine Belt ◽  
System Vibration ◽  
Drive Systems

A design methodology is developed to achieve optimum design of tensioner in serpentine belt drive systems. System component responses to a harmonic excitation from the crankshaft are obtained analytically by using a complete multi-degree of freedom model and also in explicit expressions using an equivalent single-degree of freedom model. Sequential quadratic programming and Kuhn-Tucker methods are applied to obtain the optimum design of the system modeled as multi-degree of freedom and single-degree of freedom respectively, with the objective of minimizing the undesired vibration of system components. It is shown that system vibration behavior improves substantially by optimizing the design of tensioner device.

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