torsional pendulum

torsional pendulum

[′tȯr·shən·əl ′pen·jə·ləm]
(mechanics)
A device consisting of a disk or other body of large moment of inertia mounted on one end of a torsionally flexible elastic rod whose other end is held fixed; if the disk is twisted and released, it will undergo simple harmonic motion, provided the torque in the rod is proportional to the angle of twist. Also known as torsion pendulum.
References in periodicals archive ?
The torsional pendulum set-up consisted of an ATM 3 apparatus (Myrenne, Germany) and was applied in the temperature range of 95-443 K under nitrogen.
Table 1 shows the [T.sub.g] determined by DSC, torsional pendulum and DTA.
The modulus monitored by the torsional pendulum at temperatures beyond the [T.sub.g] showed even a stronger increase with the addition of MWNT, which corresponded to the increase in melt viscosity characterized by rheology (Figs.
This paper describes the results of dynamic-mechanical investigations of a series of PLCs and conventional polymers performed with a torsional pendulum working at a constant frequency of 1 Hz in a temperature range from -150 [degrees] C to 300 [degrees] C.
A torsional pendulum experiment, however, provides only a limited ability to vary the frequency; the experiments are often carried out at 1 Hz, constantly, which is a condition not far from the equilibrium situation.
All measurements were carried out with an ATM 3 torsional pendulum system Fa.
In these cases, test bars for tensile and torsional pendulum tests were punched from the plates.
The dynamic mechanical properties were studied using an automatic torsional pendulum from Brabender.
Results from DSC and torsional pendulum measurements showed that the glass-transition temperature of polypropylene in the blends decreased with decreasing concentration of polypropylene.
In order to overcome this limitation, a new type of tuned mass damper with orthogonal poles and torsional pendulums (TMDPP) which can decrease the dynamic responses in two horizontal directions and torsional direction is proposed.
The torsional pendulums are connected with the structural roof through the universal ball hinges to ensure that the torsional poles remain horizontal in the normal state.
Compared with the conventional tuned mass dampers, the tuned mass damper with orthogonal poles and torsional mass pendulums (TMDPP) presented in this study has the following advantages: (1) the tuned mass blocks and the torsional pendulums can slide in the horizontal directions and the torsional direction, so both the horizontal kinetic energy and the rotational energy of the main structure can be transferred and dissipated, so the multidimensional control can be realized and the damping capacity is enhanced.