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.

Modelling and experimental analysis of a novel design for soft pneumatic artificial muscles

Abstract: Soft pneumatic artificial muscles (SPAMs) are a type of pneumatic actuator that provide customizable motion trajectories in three dimensional space without the need for rigid links or a transmission mechanism. This paper presents a novel design for producing SPAMs, named wrapped SPAMs (WSPAMs). Unlike previous SPAM designs, the production process of WSPAM is highly repeatable, while the motion trajectory can be easily modified. A model for predicting the steady-state angular displacement of a WSPAM actuator based on its geometrical parameters and the elasticity of the materials used in its production is presented and experimentally validated.

Electronic still camera having separable monitor device

Abstract: An electronic still camera includes a camera body having a photographic optical system, and a monitor device detachably attached to the camera body. The monitor device has an image indication portion in which an object image obtained by the photographic optical system can be indicated. The monitor device can be electrically connected to the camera body when the monitor device is attached to the camera body and is rotatable about a rotation axis provided in the camera body within a predetermined range of angular displacement. The monitor device can be detachably attached to the camera body in any direction within the predetermined angular displacement range.

Sensorless rotor angle detection circuit and method for a permanent magnet synchronous machine

Abstract: An estimate of the initial position of a rotor is made by monitoring sensed motor current signals which are amplitude and phase modulated with the rotor flux position in response to a high frequency voltage signal injection. The motor current signals are envelope detected to determine zero crossing points. Samples are taken of the motor current signals at positive and negative offsets from the zero crossing point, with the samples processed to identify a direction of the rotor flux axis. Further samples of at least one motor current signal are taken with respect to a certain phase reference, and the samples compared to resolve a polarity of the rotor flux axis which is indicative of the angular position of the rotor.

A note on two-dimensional finite-deformation theories of shells

Abstract: We supplement an earlier consideration of two-dimensional finite-deformation shell theory in terms of independent descriptions of states of translational and rotational displacement by the avoidance of the previously made a priori assumption concerning the form of components of force strain. We furthermore introduce a relatively elementary description of the state of rotational displacement, in place of the known description in terms of a Rodriguez vector, which involves a symmetric treatment of the rotations about the two surface tangent vectors, without a participation in this of the rotation about the surface normal vector.