scholarly journals QUASI-OPTIMAL DECELERATION OF ROTATIONS OF A GYROSTAT WITH A MOVING MASS COUPLED TO IT THROUGH A QUADRATIC FRICTION DAMPER IN A RESISTIVE MEDIUM

2020 ◽  
Vol 2 (1) ◽  
pp. 20-28
Author(s):  
D. Leshchenko ◽  
◽  
S. Ershkov ◽  
E. Palii ◽  
◽  
...  
Keyword(s):  
Moving Mass ◽  
Friction Damper ◽  
Resistive Medium

Quasi-optimal deceleration of rotations of a rigid body with a moving mass in a resistive medium

2017 ◽  
Vol 56 (2) ◽  
pp. 186-191 ◽  
Author(s):  
L. D. Akulenko ◽  
D. D. Leshchenko ◽  
Yu. S. Shchetinina
Keyword(s):  
Rigid Body ◽  
Moving Mass ◽  
Resistive Medium

Time Quasi-Optimal Deceleration of Rotations of a Gyrostat with a Moving Mass in a Resistive Medium

2019 ◽  
Vol 58 (5) ◽  
pp. 667-673
Author(s):  
L. D. Akulenko ◽  
T. A. Kozachenko ◽  
D. D. Leshchenko
Keyword(s):  
Moving Mass ◽  
Resistive Medium

Dynamics of an orbiting flexible beam with a moving mass

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 2225-2227
Author(s):  
D. C. D. Oguamanam ◽  
J. S. Hansen ◽  
G. R. Heppler
Keyword(s):  
Flexible Beam ◽  
Moving Mass

Electric Weighing of a Moving Mass

1918 ◽  
Vol 119 (6) ◽  
pp. 111-111
Author(s):  
J. M. Bird
Keyword(s):  
Moving Mass

Seismic performance evaluation of multi-story CBFs equipped with SMA-friction damping braces

2021 ◽  
pp. 1045389X2098700 ◽  
Author(s):  
Canxing Qiu ◽  
Jiawang Liu ◽  
Jun Teng ◽  
Zuohua Li ◽  
Xiuli Du
Keyword(s):  
Strain Hardening ◽  
Ground Motions ◽  
Residual Deformation ◽  
Martensite Phase ◽  
Friction Damper ◽  
Concentrically Braced Frames ◽  
Friction Damping ◽  
Friction Mechanism ◽  
Building Collapse ◽  
Response Characteristics

Shape memory alloys (SMAs) gained increasing attentions from the perspective of seismic protection, primarily because of their excellent superelasticity, satisfactory damping and high fatigue life. However, the superelastic strain of SMAs has an upper limit, beyond which the material completes the austenite to martensite phase transformation and is followed by noticeable strain hardening. The strain hardening behavior would not only induce high force demand to the protected structures, but also cause unrecoverable deformation. More importantly, the SMAs may fracture if the deformation demand exceeds their capacity under severe earthquakes. In the case of installing SMA braces (SMABs) in the multi-story concentrically braced frames (CBFs), the material failure would lead to the malfunction of SMABs and this further causes building collapse. The friction mechanism could behave as a “fuse” through capping the strength demand at a constant level. Therefore, this paper suggests connecting the SMAB with a friction damper to achieve a novel brace, i.e. the SMA-friction damping brace (SMAFDB). A proof-of-concept test was carried out on a homemade specimen and the test results validated the novel brace behaves in a desirable manner. In addition, to explore the seismic response characteristics of the SMAFDB within structures, a six-story CBF equipped with SMAFDBs was designed and compared against those incorporated with SMABs or friction damping braces (FDBs) at the frequently occurred earthquake (FOE), design basis earthquake (DBE) and maximum considered earthquake (MCE). The comparative results show the SMAFDB is superior to the counterparts. Under the FOE and DBE ground motions, the SMAFDBs successfully eliminated residual deformations as the SMABs do, and achieved identical maximum interstory drift as the FDBs. Under the MCE ground motions, the SMAFDBs not only well addressed the brace failure problem that was possibly encountered in the SMABs, but also better controlled residual deformation than the FDBs.

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