Variable friction cladding connection for seismic mitigation

2019 ◽  
Vol 189 ◽  
pp. 243-259 ◽  
Author(s):  
Yongqiang Gong ◽  
Liang Cao ◽  
Simon Laflamme ◽  
James Ricles ◽  
Spencer Quiel ◽  
...  
Keyword(s):  
Variable Friction ◽  
Friction Cladding ◽  
Seismic Mitigation

scholarly journals Motion-based design approach for a novel variable friction cladding connection used in wind hazard mitigation

2019 ◽  
Vol 181 ◽  
pp. 397-412 ◽  
Author(s):  
Yongqiang Gong ◽  
Liang Cao ◽  
Simon Laflamme ◽  
James Ricles ◽  
Spencer Quiel ◽  
...  
Keyword(s):  
Hazard Mitigation ◽  
Design Approach ◽  
Wind Hazard ◽  
Variable Friction ◽  
Friction Cladding

scholarly journals Numerical verification of variable friction cladding connection for multihazard mitigation

2020 ◽  
pp. 107754632092393
Author(s):  
Yongqiang Gong ◽  
Liang Cao ◽  
Simon Laflamme ◽  
James Ricles ◽  
Spencer Quiel ◽  
...  
Keyword(s):  
Sliding Friction ◽  
Design Procedure ◽  
Design Parameters ◽  
Numerical Verification ◽  
Structural System ◽  
Passive Energy Dissipation ◽  
Variable Friction ◽  
Friction Cladding ◽  
And Performance ◽  
Selection Of

The motion of cladding systems can be leveraged to mitigate natural and man-made hazards. The literature counts various examples of connections enhanced with passive energy dissipation capabilities at connections. However, because such devices are passive, their mitigation performance is typically limited to specific excitations. The authors have recently proposed a novel variable friction cladding connection capable of mitigating hazards semi-actively. The variable friction cladding connection is engineered to transfer lateral forces from the cladding element to the structural system. Its variation in friction force is generated by a toggle-actuated variable normal force applied onto sliding friction plates. In this study, a multiobjective motion-based design methodology integrating results from the previous work is proposed to leverage the variable friction cladding connection for nonsimultaneous wind, seismic, and blast hazard mitigation. The procedure starts with the quantification of each hazard and performance objectives. It is followed by the selection of dynamic parameters enabling prescribed performance under wind and seismic loads, after which an impact rubber bumper is designed to satisfy motion requirements under blast. Last, the peak building responses are computed and iterations conducted on the design parameters on the satisfaction of the motion objectives. The motion-based design procedure is verified through numerical simulations on two example buildings subjected to the three nonsimultaneous hazards. The performance of the variable friction cladding connection is also assessed and compared against different control cases. Results show that the motion-based design procedure yields a conservative design approach in meeting all of the motion requirements and that the variable friction cladding connection performs significantly well at mitigating vibrations.

Development of Pneumatic Variable Friction Dumper to Correct Body Movement

2021 ◽  
Vol 57 (1) ◽  
pp. 19-24
Author(s):  
Tomoaki KAMIMURA ◽  
Daisuke SASAKI ◽  
Hayato YASE ◽  
Jun KADOWAKI
Keyword(s):  
Body Movement ◽  
Variable Friction

scholarly journals Long-Stroke Nanopositioning Stage Driven by Piezoelectric Motor

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yong Wang ◽  
Fujun Sun ◽  
Junhui Zhu ◽  
Ming Pang ◽  
Changhai Ru
Keyword(s):  
High Speed ◽  
Control Method ◽  
Laser Vibrometer ◽  
Piezoelectric Motor ◽  
Backward Error ◽  
Positioning Control ◽  
Ac Drive ◽  
Variable Friction ◽  
Long Stroke ◽  
Speed Characteristic

This paper reported a biaxial nanopositioning stage single-driven by piezoelectric motor. The employed piezoelectric motor can perform two different driving modes, namely, AC drive mode to drive in long-stroke and at high-speed and DC scanning mode with the high-resolution of several nanometers, which satisfies the requirements of both long-stroke and nanoresolution. To compensate for the effects of the variable friction force and some unpredictable disturbances, a novel backward error compensation (BEC) positioning control method integrated of the two driving modes and a double closed-loop PID controller system are proposed to obtain a high-accuracy positional motion. The experiment results demonstrate that the nanopositioning stage with large travel range of 300 mm × 300 mm has a fine speed characteristic and resolution is 5 nm. In the experiments of different travels up to 15 mm, calibrated by a commercial laser vibrometer, the positioning accuracy is proved within 55 nm inx-axis and 40 nm iny-axis with standard deviation less than 40 nm inx-axis and 30 nm iny-axis and the final position locking can be limited to 10 nm, meeting the requirements of micromanipulation technology.

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