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.

Compact construction vehicle with improved mobility

Abstract: A loader type construction vehicle includes a chassis having a longitudinal axis, a plurality of wheeled ground-engaging structures pivotally coupled to the chassis, and a steering control system. Each of the plurality of ground-engaging structures includes a wheel pivotable about a steering axis and drivable about a drive axis, wherein each of the wheeled ground-engaging structures is shaped and configured so that the wheel of each of the ground-engaging structures can be pivoted from a first angular position in which the drive axis is perpendicular to the longitudinal axis, to a second angular position that is at least 90° degrees from the first angular position. The steering control system is operatively connected to each of the ground engaging structures for pivoting the wheel of each of the ground-engaging structures about the steering axis. The steering system may be operable to selectively configure the ground engaging structures into a plurality of different steering configurations, such as crab steering and side steering. The loader vehicle may include a telescopic loader arm.

Automotive air conditioning system

Abstract: A damper position control device for an automotive air conditioning system having a lock release mechanism for the drive shaft of a motor which controls the angular position of an air mix damper. A damper position control device is disclosed which controls the angular position of an air mix damper. The damper position control device includes a motor actuator which drives the air mix damper and a control circuit. The motor actuator includes a drive motor for the air mix damper and a rotation control device including a regulator which regulates the upper and lower rotational limits of the shaft of the drive motor and a position detector which detects the rotational angle of the shaft. The control circuit controls the motor actuator in accordance with a plurality of detected signals. The control circuit generates a drive signal which drives the motor actuator and further includes a lock detector which detects if the shaft of the motor is locked against rotational motion in a first rotational direction. The control circuit also includes a lock release which releases the motor so as to permit rotational motion in a second rotational direction after the motor as been locked against rotational motion in the first rotational direction if the motor is within a first predetermined angular displacement from the upper rotational limit or within a second predetermined angular displacement from a lower rotational limit and if the drive signal causes the motor to rotate in the second rotational direction.

A piezoelectric inertia rotary actuator based on asymmetric clamping mechanism

Abstract: A newly piezoelectric inertia rotary actuator is presented by using asymmetric mechanical structure to produce asymmetric inertia impact force when the symmetric electrical signal is applied to the piezoelectric bimorph Mechanical analysis was derived and simulation model of asymmetric clamping mechanism was established to determine the influence of structural parameters to the output performance. A prototype was developed and a series of experiments were conducted to evaluate the performance in terms of angular displacement, speed, and load characteristic. The experimental results show that the angular displacement of the actuator is approximately proportional to the amplitude of driving voltage, and an angular displacement resolution of 12 µrad is obtained with a square wave of 15 Vpźp at a frequency of 4 Hz. The maximum torque can reach 3.96 N mm at 70 Vpźp applied voltage and 2 Hz driving frequency. The rotary actuator characterized with an asymmetric clamping mechanism will provide new references for the further research on piezoelectric inertia drive mechanism.

Maintenance of body orientation in the flight phase of long jumping.

Abstract: The purpose of this investigation was to examine the contributions of the various body segments to the maintenance of body orientation during the flight phase of the long jump. Proper maintenance of body orientation was defined to be achieved if the net angular displacement of the head-and-trunk segment was zero during the flight phase of the long jump. To achieve a zero net angular displacement of the head-and-trunk segment a long jumper needs to execute appropriate arm and leg movements relative to the head-and-trunk segment to counteract the effects of the whole body transverse centroidal angular momentum imparted at takeoff. The contributions of arm and leg movements to the maintenance of body orientation are discussed for the specific cases of a sail and a 2 1/2 hitch-kick long jump. Inherent weaknesses of the sail and hitch-kick techniques, as well as specific weaknesses of two athletes executing these techniques, are discussed with reference to body orientation during the flight phase of the long jump.