Topic
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.
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TL;DR: In this paper, an alternative method based upon coupling techniques is developed, in which rotational receptances are estimated without the need of applying a moment excitation, which is accomplished by introducing a rotational inertia modification when rotating the T-block.
Abstract: The dynamic response of a structure can be described by both its translational and rotational receptances. The latter ones are frequently not considered because of the difficulties in applying a pure moment excitation or in measuring rotations. However, in general, this implies a reduction up to 75% of the complete model. On the other hand, if a modification includes a rotational inertia, the rotational receptances of the unmodified system are needed. In one method, more commonly found in the literature, a so called T-block is attached to the structure. Then, a force, applied to an arm of the T-block, generates a moment together with a force at the connection point. The T-block also allows for angular displacement measurements. Nevertheless, the results are often not quite satisfactory. In this work, an alternative method based upon coupling techniques is developed, in which rotational receptances are estimated without the need of applying a moment excitation. This is accomplished by introducing a rotational inertia modification when rotating the T-block. The force is then applied in its centroid. Several numerical and experimental examples are discussed so that the methodology can be clearly described. The advantages and limitations are identified within the practical application of the method.
27 citations
Patent•
27 May 2004
TL;DR: In this paper, a method of at least partially compensating for errors in ink dot placement by at least one of a plurality of nozzles due to erroneous rotational displacement of a printhead module relative to a carrier was proposed.
Abstract: A method of at least partially compensating for errors in ink dot placement by at least one of a plurality of nozzles due to erroneous rotational displacement of a printhead module relative to a carrier, the nozzles being disposed on the printhead module, the method comprising the steps of: (a) determining the rotational displacement; (b) determining at least one correction factor that at least partially compensates for the ink dot displacement; and (c) using the correction factor to alter the output of the ink dots to at least partially compensate for the rotational displacement.
27 citations
TL;DR: In this article, a PZT-based high d constant piezoelectric torsional actuator with an interdigital electrode on the outer surface of a cylindrical body at an angle of 45° from the length axis of the cylinder is presented.
Abstract: Piezoelectric torsional actuators have been developed from single ceramic cylindrical bodies using PZT based high d constant piezoelectric ceramics. The actuator geometry is able to produce rotational motion directly by DC voltage control without conventional complex conversion from XY direction motions. The key feature of this actuator is the interdigital electrode on the outer surface of the cylinder at an angle of 45° from the length axis of the cylinder, and the design of this electrode is critical for adjusting torsional angle and driving voltage. When the cylinder wall thickness and the ratio between electrode width and pitch are kept constant, the rotational angle is approximately proportional to the electric field, i.e. the narrower electrode gap needs smaller driving voltage in order to obtain a certain rotational angle. Among the three different diameter samples tested, actual rotational displacements are the same under the same conditions. Therefore, the rotational angle is reversibly proportio...
27 citations
TL;DR: In this paper, a torsional actuator and a stepper motor were designed to produce large angular displacement and large torque output from the piezoelectric d15 shear response.
Abstract: Two novel devices, torsional actuator and torsional stepper motor, are described and their performance is investigated in detail. Both devices were designed to produce large angular displacement and large torque output from the piezoelectric d15 shear response. In the torsional actuator, the large displacement can be achieved due to built-in amplification of piezoelectric strain using the aspect ratio of a piezoelectric tube. It is shown that the displacement can be controlled by changing the length of the tube, and that the blocking torque developed is independent of the length. It is also shown that the performance of the actuator does not change under external torque load, and that the prestress in radial direction improves the mechanical strength of the actuator without affecting the produced displacement. In the stepper motor, the unlimited angular displacement of the rotor is produced by accumulating the piezoelectric strain by using a direct coupling mechanism between the stator and the rotor, wher...
27 citations
Patent•
14 Mar 2001
TL;DR: In this article, a method for rotating a combdriven device about an axis uses applied bias force along with applied voltage between first and second comb fingers to controllably rotate the device about one or two axis.
Abstract: A method for rotating a combdriven device about an axis uses applied bias force along with applied voltage between first and second comb fingers to controllably rotate the device about one or two axis. One mode of the present invention includes measuring the position of a rotating element and providing feedback to control the angular position thereof by changing bias force and/or drive voltage. The present invention can be employed with prior-art staggered combdrives, single layer self-aligned combdriven devices, and in a broad range of applications in optical telecommunication switching, video, biomedical, inertial sensors, and in storage magnetic disk drives.
27 citations