Angular displacement

About: Angular displacement is a research topic. Over the lifetime, 5102 publications have been published within this topic receiving 46081 citations. The topic is also known as: rotational displacement.

Sensing Mechanism of a Rotary Magnetic Encoder Based on Time Grating

Abstract: This paper presents a sensing mechanism of a rotary magnetic encoder based on the time grating approach. The relationship between spatial displacement and time standard is built by the orthogonal alternating magnetic field in the rotational motion. Time pulses serve as measurement standard and are counted to measure the angular displacement. Therefore, this displacement detection method is called time grating. The alternating magnetic field is generated using the magnetic ring rotating with the shaft. Pairs of tunnel magneto resistance sensors are separated by 90° electrically angles to induce the alternating magnetic field and output orthogonal voltage signals. The travelling wave would be generated by signal processing, which has the phase shift with the rotating shaft. Thus, the rotation angle is measured by counting the time pluses corresponding to the phase difference. A rotary magnetic encoder has been fabricated to evaluate the proposed method. Experimental results indicate that the measurement has high resolution and stability.

System and method for sensing torque and angular position of a shaft

Abstract: A system and method for sensing torque and angular position of a rotating shaft may include a shaft with a magnetostrictive ring affixed to the shaft. The magnetostrictive ring may generate position-dependent magnetic fields relative to the shaft's rotation. A first sensor may measure a magnetic field that varies with angular position. A second sensor may measure a magnetic field that varies with torque.

Range of motion analysis system

Abstract: A system and method are disclosed for measuring range of motion of a body joint formed between a first body portion and a second body portion. The system includes a range of motion sensor comprising a support linkage having a first link joined to a second link for relative movement therebetween. The first link is adapted to be retained for movement with the first body portion and the second link is adapted to be retained for movement with the second body portion. An angular sensing device senses angular displacement of the second link relative to the first link and provides a representative indication thereof. A force sensing device joined to the support linkage senses the applied force to the first body portion and provides a representative indication thereof. Output signals from the angular sensing device and the force sensing device are provided to a signal processor for recording and analysis.

Single-Plane Auto-Balancing of Rigid Rotors

Abstract: This paper presents an analytical study of single-plane automatic balancing of statically and dynamically unbalanced rigid rotors, considering also the effect of partial unbalance compensation and vibration reduction. We consider a rotor equipped with a self- balancing device consisting of a circular track with moving balls to compensate for rotor unbalance. The investigations include an analysis of the equations of motion and determination of conditions for existence and stability of synchronous motions. Different solutions for the existence conditions correspond to different types of synchronous motions, including compensatory motions, with the elements’ positions providing complete or partial compensation of unbalanced forces as well as reduction of vibrations. A stability analysis serves to determine the actual angular position of elements at any rotational speed and to find the speed range with stable unbalance compensation. Numerical simulations confirm the analytical results except for those in the immediate vicinity of critical speeds.