An asymmetrical double torsion pendulum for studying coupled harmonic motion

2020 ◽  
Vol 88 (9) ◽  
pp. 760-768
Author(s):  
Yuntian Wang ◽  
Xintong Duan ◽  
Mingzhen Shao ◽  
Cailin Wang ◽  
Huan Zhang
Keyword(s):  
Torsion Pendulum ◽  
Harmonic Motion ◽  
Double Torsion

scholarly journals Modeling And Parameter Identification Of Vibrations Of A Double Torsion Pendulum With Friction

2015 ◽  
Vol 9 (4) ◽  
pp. 204-212 ◽  
Author(s):  
Ernest Czerwiński ◽  
Paweł Olejnik ◽  
Jan Awrejcewicz
Keyword(s):  
Angular Displacement ◽  
Degree Of Freedom ◽  
Torsion Pendulum ◽  
State Variables ◽  
Unknown Parameters ◽  
Linear Harmonic Oscillator ◽  
Frictional Forces ◽  
Free Body ◽  
Set Up ◽  
Double Torsion

Abstract The purpose of this paper is to investigate a double torsion pendulum with planar frictional contact. The single torsion pendulum with one-degree-of-freedom is an angular equivalent of the linear harmonic oscillator. The second degree of freedom has been obtained by adding a free body to the inverted single torsion pendulum. The free body’s angular displacement is caused by frictional forces appearing in the interface (contact zone) between the free body and the pendulum column’s head kinematically excited at its base by a mechanism with torsion spiral spring. An experimental station has been set up and run to find most unknown parameters of the pendulum from the time series of state variables taken as inputs to the Nelder-Mead method of identification. The obtained results proved significant usability of the identification method in the case of numerical simulation of the pendulum’s dynamical model. It has not been satisfactorily proved in the case of time characteristics coming from a real system that exhibits also some unrecognized physical effects.

The Double Torsion Pendulum in a Liquid

1942 ◽  
Vol 10 (3) ◽  
pp. 152-153 ◽  
Author(s):  
Yee-Tak Yu
Keyword(s):  
Torsion Pendulum ◽  
Double Torsion

Research on Measurement Equipment for Moment of Inertia of Triple Torsion Bars Based on Torsion Pendulum

2016 ◽  
Vol 851 ◽  
pp. 286-291
Author(s):  
De Min Wang ◽  
Jian Zhang ◽  
Jian Liu ◽  
Tong Zhu ◽  
Fang Chao Shao ◽  
...  
Keyword(s):  
Moment Of Inertia ◽  
Measurement Equipment ◽  
Torsion Pendulum ◽  
Measuring Range ◽  
Measurement Devices ◽  
The Moment ◽  
Torsion Bar ◽  
Double Torsion

In order to increase the measuring range of the moment of inertia, a new measurement equipment with triple torsion bars based on torsion pendulum was designed. The equipment could switch the number of torsion bars from single to double or triple by inserting or extracting two movable pins and implement the function of three different measurement devices. The detailed deducing process for the measuring range of the moment of inertia at various measurement states was given. The results show that the measuring range of the measurement equipment has been significantly improved compared with other equipment using single torsion bar or double torsion bars and verify the effectiveness and practicability of the measurement equipment.

Improving sensitivity and duty-cycle of a double torsion pendulum

2019 ◽  
Vol 36 (12) ◽  
pp. 125004
Author(s):  
M Bassan ◽  
M De Laurentis ◽  
R De Rosa ◽  
L Di Fiore ◽  
L Errico ◽  
...  
Keyword(s):  
Duty Cycle ◽  
Torsion Pendulum ◽  
Double Torsion

scholarly journals “Quasi-complete” mechanical model for a double torsion pendulum

2013 ◽  
Vol 87 (12) ◽  
Author(s):  
Fabrizio De Marchi ◽  
Giuseppe Pucacco ◽  
Massimo Bassan ◽  
Rosario De Rosa ◽  
Luciano Di Fiore ◽  
...  
Keyword(s):  
Mechanical Model ◽  
Torsion Pendulum ◽  
Double Torsion

Discussion following the presentation by F. Deubner

1977 ◽  
Vol 36 ◽  
pp. 69-74
Keyword(s):  
List Type ◽  
The Sun ◽  
Type Number ◽  
Harmonic Motion ◽  
Locally Excited ◽  
Long Period ◽  
Coherent Wave ◽  
Short Period ◽  
Global Modes

The discussion was separated into 3 different topics according to the separation made by the reviewer between the different periods of waves observed in the sun :1) global modes (long period oscillations) with predominantly radial harmonic motion.2) modes with large coherent - wave systems but not necessarily global excitation (300 s oscillation).3) locally excited - short period waves.

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