Forced vibration damping compound pendulum experimental instrument

Abstract

Provided is a forced vibration damping compound pendulum experimental instrument. A compound pendulum formed by a rigid thin rod, a pendulum bob and an arc pendulum sheet is adopted to serve as a research object of forced vibration. The compound pendulum and a mobile rotating shaft are connected to form a whole body, which is disposed in a mobile rotating shaft box through a bearing. The compound pendulum can freely swing. The mobile rotating shaft box is disposed on a slide block and a linear guide rail. A speed regulation motor pushes and pulls the mobile rotating shaft box by means of an eccentric shaft on a driving wheel and also a connecting rod device, the circular motion of the eccentric shaft on the driving wheel of the motor is transformed to the reciprocating rectilinear motion of the mobile rotating shaft box, and then energy is transmitted for forced vibration of the compound pendulum. Furthermore, a non-contact type magnetic angle sensor is utilized to measure rotation conditions of the driving wheel of the speed regulation motor and the compound pendulum, and measured parameters and a corresponding changing curve are displayed on a colorful liquid crystal screen of an instrument host in a quantified manner.

Description

technical field [0001] The invention relates to a mechanical experimental instrument in physics, in particular to a forced vibration damping compound pendulum experimental instrument for studying the physical laws of forced vibration. Background technique [0002] Some existing physical experiment instruments for studying forced vibration have a common feature of using a disc rotating on a fixed axis, so that it can twist and vibrate back and forth around the rotating shaft of the disc under the torque of the torsion spring. At the same time, a periodic external torsional moment is used to indirectly exert a forced moment on the disc, so as to achieve the purpose of forcing the disc to vibrate. The above-mentioned physical experimental instruments for studying forced vibration are not adjustable because of the inherent vibration frequency when the disk vibrates, and the observation of the angle of rotation is not intuitive enough. The experimental functions of the instrument...

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Problems solved by technology

However, for the invention applied for at that time, the experimental measurement method was still not advanced enough, and although the intuitiveness of the display of the forced vibration process was significantly improved compared with the previous instruments with the same function, it still had the inadequacy of quantitative inaccuracy.

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