Showing papers on "Angular displacement published in 1973"
01 Feb 1973
TL;DR: In this paper, the results of a comparison of 41 previously reported test runs and human volunteer runs run by Mertz and Patrick in testing torque versus angular displacement response of the human head to -Gdx impact acceleration were discussed.
Abstract: This paper discusses the results of a comparison of 41 previously reported test runs and human volunteer runs run by Mertz and Patrick in testing torque versus angular displacement response of the human head to -Gdx impact acceleration Due to different instrumentation and measuring techniques, there were several differences, but large portions of the data were comparable The paper points out the need for anatomically based three-dimensional coordinate systems to permit quantitative comparisons between human subjects
56 citations
Patent•
13 Apr 1973
TL;DR: In this paper, a contactless rotational angle transducer is used to generate an output signal indicating the angular position of a rotatable object, where the number of complete or partial turns of the object can be measured.
Abstract: A contactless rotational angle transducer for developing an output signal indicative of the angular position of a rotatable object comprising a fixed stator plate having a plurality of electrically isolated sector members, a parallel spaced-apart confronting plate, and a sector rotor plate situated between the stator and confronting plates and rotatably coupled to the rotatable object. An AC excitation voltage is impressed at a fixed phase relationship on each sector member such that the voltage induced in the confronting plate is a function of the angular position of the rotor plate. A pulse generator circuit responsive to the relative phase difference between the voltage induced on the confronting plate and the applied excitation signal develops a pulse-width modulated or pulse-positionmodulated output signal indicative of the angular position of the rotatable object, wherein the number of complete or partial turns of the rotatable object can be measured.
36 citations
Patent•
14 May 1973
TL;DR: In this article, a cylindrical object is covered with a strip of sheet material having a width less than the length of the object and is applied by rotating the object while feeding the sheet material at a right angle to the rotational axis of the shape to provide convolute windings around opposite end portions of the objects.
Abstract: The cylindrical object is covered with a strip of sheet material having a width less than the length of the object and is applied by rotating the object while feeding the sheet material at a right angle to the rotational axis of the object to provide convolute windings around opposite end portions of the object and guiding the sheet material in angular relationship to the rotational axis of the object to provide spiral windings around the medial portion of the object. A pair of rolls support and rotate the object while the sheet material is fed from a carriage which moves along a path of travel parallel to the drive rolls and the angular position of the carriage is varied to thereby change the relationship between the rotational axis of the supply roll and the rotational axis of the object so as to permit both convolute and spiral windings to be applied to the object.
29 citations
Patent•
28 Jun 1973
TL;DR: In this article, a system for generating a signal for controlling the rotation of a shaft supporting an antenna so that the antenna is rotated the shortest angular distance from a present angular position to a new desired angular position is presented.
Abstract: A system for generating a signal for controlling the rotation of a shaft supporting an antenna so that the antenna is rotated the shortest angular distance from a present angular position to a new desired angular position. The system comprises a shaft encoder means which generates a digital encoder signal indicating the present position of the shaft. A command signal is compared with the encoder signal to produce an analog signal for rotating the antenna. An error signal is produced for controlling the direction of rotation of the antenna.
28 citations
Patent•
28 Feb 1973
TL;DR: An apparatus for balancing a rotary body with a balancing spindle is described in this paper, where a phase displacement device is used to measure and store the angular position of unbalance of the rotation of the rotary base.
Abstract: An apparatus for balancing a rotary body with a balancing spindle for carrying the rotary body to be balanced, means for measuring and storing the angular position of unbalance of the rotary body, a phase displacement device non-rotatably connected to the balancing spindle and in operation receiving a reference phase signal from the measuring means and delivering an output voltage whose phase position represents a measurement of the angular position of unbalance, and an indicator comprising a scale for indicating only a part of the whole angular range of 360*, which part is adjacent to the value zero on the scale, a pointer which can be set to the value zero on the scale by rotation of the phase displacement means and the rotary body, for rotating the rotary body into the correct position for a balancing operation, and two illuminatable direction-indicator means, the brightness of illumination of each of the directionindicator means being independently controllable by the output voltage of the phase displacement means and by the stored measurement value in said measuring means, whereby any difference in the brightness of illumination of each of the directionindicator means indicates the direction in which the rotary body must be rotated to move it towards the correct position and to bring the pointer into the range of the scale
13 citations
TL;DR: In this article, the authors studied the self-torque of a rotating sphere with rigid surface charge and obtained an exact integral expression for it, which depends causally and linearly on the angular speed.
Abstract: Radiation reaction in classical electrodynamics is studied using as a simple model a rotating sphere with rigid surface charge. Because of the transparent geometric nature of the problem, we obtain an exact integral expression for the “self-torque”, which depends causally and linearly on the angular speed. This leads to a linear equation of motion, which does not have any runaway solutions, as long as no negative mechanical moment-of-inertia is added to the system. The results are illustrated with a few examples corresponding to predetermined motions and external torques.
11 citations
Patent•
09 Oct 1973
TL;DR: In this paper, a method and apparatus for studying the structure of a single crystal by the detection of X-ray reflections from said crystal operates in a manner such that the sample crystal is first positioned on a rotatable support having means for indicating its angular position and means for driving it at either one of two speeds of rotation, i.e., one rapid and one slow.
Abstract: A method and apparatus for studying the structure of a single crystal by the detection of X-ray reflections from said crystal operates in a manner such that the sample crystal is first positioned on a rotatable support having means for indicating its angular position and means for driving it at either one of two speeds of rotation, ie, one rapid and one slow The crystal support is rotated at its fast speed of rotation while sweeping the angular field of irradiation of the X-rays to obtain reflections The rotatable support is then replaced at one of the positions where a reflection was observed during the fast rotation and such rotatable support is then rotated at its slow speed of rotation until a reflection occurs again Means are provided for reading the angular position of the rotatable support, and from those angular positions determining the structure of the crystal
11 citations
Patent•
02 Jan 1973
TL;DR: In this article, a light beam generating means and means for providing output signals which indicate lateral or angular displacement of the optical axis of a lens with respect to the optimum axis or the axis of the apparatus and the focus or relation to the position of optimum focus.
Abstract: Apparatus for determining the alignment in the direction transverse of the optical axis of a lens and/or its focus. The apparatus includes a light beam generating means and means for providing output signals which indicate lateral or angular displacement of the optical axis of the lens with respect to the optimum axis or the axis of the apparatus and the focus or relation to the position of optimum focus of the lens. Another configuration provides means for accurately determining the magnification of an image produced by an optical system in addition to determination of optimum focus.
8 citations
Patent•
05 Oct 1973TL;DR: In this article, a stator and a rotor are provided, the latter being coaxial with the stator, and connected with the shaft which is driven by the combustion engine, and the pole pieces of the first group are all simultaneously juxtaposed with one each pole piece of one of the sets when the rotor is in one of its angular positions.
Abstract: A stator and a rotor are provided, the latter being coaxial with the stator and connected with the shaft which is driven by the combustion engine. During the rotation of the rotor the same can assume at least two angular positions relative to the stator. A first group of pole pieces is provided on the rotor or stator and these are equi-angularly spaced about the same projecting on radii which extend outwardly from the axis of rotation. A second group of pole pieces are provided on the stator or rotor, spaced angularly about the same and including at least two sets each of which is composed of a second plurality of pole pieces which is identical with the first plurality. The pole pieces of the first group are all simultaneously juxtaposed with one each of the pole pieces of one of the sets when the rotor is in one of its angular positions, and they are all simultaneously juxtaposed with one each of the pole pieces of the other set when the rotor is in the other of its angular positions. The angular distance through which the rotor travels in its direction of rotation from its one to its other angular position is different from the angular distance which it travels in the same direction to return from the other to its one position.
8 citations
Patent•
21 Dec 1973
TL;DR: In this article, a plurality of radiation sensors are mounted in a rotating body, and successively enabled to sense radiation as their fields of view sweep across a radiation source emitting radiation too faint to be separable from the background noise by conventional means.
Abstract: Apparatus employing a plurality of radiation sensors mounted in a rotating body, and successively enabled to sense radiation as their fields of view sweep across a radiation source emitting radiation too faint to be separable from the background noise by conventional means By summing the signals from the sensors, the signal-to-noise ratio can be sufficiently improved to allow an accurate determination of the angular position of the body with respect to the radiation source, and the angular velocity of the rotating body In a preferred embodiment, the sensors are grouped into pairs having adjacent fields of view, and each pair is enabled separately as their combined fields of view sweep across adjacent but non-overlapping areas which, together contain the radiation source The difference in output signals between the sum of the signals from the left-hand sensors and the sum of the signals from the right-hand sensors is a measure of the angular position and velocity of the rotating body with respect to the radiation source at the time each pair of sensors were enabled
7 citations
Patent•
02 Jul 1973
TL;DR: A cabochon is formed by rotating a gemstone workpiece about a rotational axis while contacting it with an abrasive surface, moving the workpiece and the rotational axes in a radial path in response to its rotational movement to change the lateral position of the rotation as mentioned in this paper.
Abstract: A cabochon is formed by rotating a gemstone workpiece about a rotational axis while contacting it with an abrasive surface, moving the workpiece and the rotational axis in a radial path in response to its rotational movement to change the lateral position of the rotational axis in response to the angular displacement of the workpiece during its rotation, and swinging the rotational axis with respect to the abrasive surface, the swing axis lying normal both to the rotational axis and to the radial movement of the rotational axis.
Patent•
16 Jul 1973
TL;DR: An angular direction sensing device having rotatably mounted on a support member a circular motion potentiometer having electrical power supply connections and input and output connections thereto and a plurality of tapping points, a magnet rotatable mounted so that it can align itself substantially freely with the earth''s magnetic field, a rotor in accordance with the angular position of which the said tapping points are sequentially connectable to an output connection, is arranged to be a function of the angle between said given tapping point and the magnet and so independent of the orientation of said support member as discussed by the authors.
Abstract: An angular direction sensing device having rotatably mounted on a support member a circular motion potentiometer having electrical power supply connections and input and output connections thereto and a plurality of tapping points, a magnet rotatably mounted so that it can align itself substantially freely with the earth''s magnetic field, a rotor in accordance with the angular position of which the said tapping points are sequentially connectable to an output connection, and means whereby the angular position of the rotor in relation to a given tapping point of the potentiometer, and hence any electrical output signal thereof, is arranged to be a function of the angle between said given tapping point and the magnet and so independent of the orientation of said support member.
Patent•
14 May 1973
TL;DR: In this article, the rotatable shaft of a tool holder is displaced on a pivotal arm which is articulated to a crank centered on the tool axis, and a gear train rotates the workpiece about the holder axis at a rate determined by the angular displacement of the arm.
Abstract: Cycloidal surfaces can be machined in a workpiece by displacing the latter relative to a chip-removal tool having a stationary axis, by mounting the workpiece upon the rotatable shaft of a tool holder, the shaft axis being displaced on a pivotal arm which is articulated to a crank centered on the tool axis. A gear train rotates the workpiece about the holder axis at a rate determined by the angular displacement of the arm, one end of which is guided along a linear path aligned with the tool axis. As a result high-precision single or multicuspid cycloidal configurations can be formed in the workpiece without the use of a template or master.
Patent•
16 Mar 1973
TL;DR: In this article, a sensor with a digital electrical output based on the rotation of the axis of magnetization in a thin magnetostrictive film under the influence of a stress not colinear with said axis is detected by means of a pulsed step-by-step rotating interrogating magnetic field established by a printed circuit interrogating lead.
Abstract: A sensor with a digital electrical output based on the rotation of the axis of magnetization in a thin magnetostrictive film under the influence of a stress not colinear with said axis. The new orientation of the magnetization axis is detected by means of a pulsed step-by-step rotating interrogating magnetic field established by a printed circuit interrogating lead. When such field crosses the perpendicular to the magnetizaton axis, the binary signal induced in a printed read circuit switches from a first binary value to the second value. The count of the binary read pulses before switch over is a measure of the angular position of the magnetization axis.
TL;DR: In this paper, the problem of random rotational displacement is solved and the theory of Brownian motion of molecules in crystals is developed, and the probability distribution of orientations of a molecule is found as a decomposition into matrix elements of irreducible representations of point groups.
Abstract: The problem of random rotational displacement is solved and the theory of Brownian motion of molecules in crystals is developed. The probability distribution of orientations of a molecule is found as a decomposition into matrix elements of irreducible representations of point groups.
Patent•
16 Jan 1973
TL;DR: In this article, a mechanism is described for converting axial input motion or reciprocating motion of an input member to a precise unidirectional incremental angular displacement of an output member about the axis of the mechanism to achieve a predetermined amount of angular motion.
Abstract: A mechanism is disclosed for converting axial input motion or reciprocating motion of an input member to a precise unidirectional incremental angular displacement of an output member about the axis of the mechanism to achieve a predetermined amount of angular motion. This predetermined amount of angular motion results for each input reciprocation. This is achieved by using a set of three cooperating cams-one stationary locator cam and two moving cams: one drive cam moving axially and one output cam moving both axially and angularly; a spline or other axially movable angular driving device is used for subtracting the axial movement from the motion of the output cam to yield a purely rotary motion.
Patent•
13 Mar 1973
TL;DR: In this paper, a rotary body is rotated within a minute angular range around its own normal axis of rotation and is resiliently supported to two spaced points along said axis so that it may be displaced in a plane perpendicular to said axis.
Abstract: A method and apparatus for detecting the angular position and amount of a dynamic unbalance of a rotary body by detecting the direction and magnitude of a displacement of the normal axis of rotation of a rotationally vibrated rotary body, the displacement corresponding to the position and amount of the unbalance of said rotary body. The rotary body is rotationally vibrated within a minute angular range around its own normal axis of rotation and is resiliently supported to two spaced points along said axis so that it may be displaced in a plane perpendicular to said axis. As a result, said normal axis of rotation of the rotary body is displaced as a function of the angular position and amount of the unbalance of the rotary body. The magnitude and direction of the displacement are detected, whereby the angular position and amount of the dynamic unbalance of the rotary body are detected.
Patent•
10 Jul 1973
TL;DR: In this article, the angular displacement of an axially reciprocating shaft is sensed by a fluid actuated sensor which generates signals responsive to angular displacement and transmits them to a proportional fluidic amplifier which divides a controlled fluid flow proportional to the signals and directs the proportionally divided flows to a fluid responsive device.
Abstract: The angular displacement of an axially reciprocating shaft is sensed by a fluid actuated sensor which generates signals responsive to the angular displacement and transmits them to a proportional fluidic amplifier which divides a controlled fluid flow proportional to the signals and directs the proportionally divided flows to a fluid responsive device.
Patent•
03 Aug 1973
TL;DR: In this article, the cutting tool of a machine for automatically cutting screw threads is carried by a cross-slide mounted on the base of the machine, and the step-by-step transverse feed of the tool is actuated by a push-rod operating against the crossslide and backed by an adjustment vernier operating colinearly with the push-Rod and mounted in the machine base.
Abstract: The cutting tool of a machine for automatically cutting screw threads is carried by a cross-slide mounted on the base of the machine. The step-by-step transverse feed of the tool is actuated by a push-rod operating against the cross-slide and backed by an adjustment vernier operating colinearly with the push-rod and mounted on the machine base. Between the vernier and push-rod are peripheral portions of a pair of discs which are mounted face-toface for rotational movement step-by-step about an axis parallel to the line of action of the push-rod and for movement along said axis. The two faces of each disc are planar and non-parallel, and the angle between the two faces of the disc is the same for each disc. By adjusting the angular positions of the discs relative to each other and the angular position of the disc assembly about said axis, a desired programme of automatic thread-cutting operations can be pre-set.
TL;DR: In this article, a pair of circular scales which have the same number of graduations are arranged concentrically, and a series of measurements of the little angles between the corresponding graduations of these scales are made.
Abstract: The purpose of this paper is to show a new method of accurate measurement of the circular dividing error. In this method, a pair of circular scales are calibrated at a time without any standard, by means of relative measurement of these two scales. First, a pair of circular scales which have the same number of graduations are arranged concentrically, and a series of measurements of the little angles between the corresponding graduations of these scales are made. Then, one of the pair is turned at a certain angle so as to change the relative angular position between two scales properly, and a series of measurements of the little angles between the new corresponding graduations of these scales are made samely. The accuracies of the scales are estimated from two series of measurements. This method is applicable to the measurements of graduation errors of circular scales and other similars. Here, the applications are made to the measurements of facet angle errors of polygon mirrors with the accuracy of the measurement 0.2 seconds of arc, pitch errors of spur gears with the accuracy 1.5 seconds and indexing errors of worm gears with the accuracy 2 seconds transforming the angle to the time, dynamically.