Showing papers on "Rotational speed published in 1970"

Sudden Changes in Rotational Acceleration of the Earth and Secular Motion of the Pole

Abstract: Development of the atomic clock in 1955 has made possible the detailed determination of irregular variations in speed of rotation. Sudden changes do not occur in speed but do in acceleration, about every 4 years. The motion of the mean pole consists of a progressive component of 10 cm/yr plus a 24-year oscillation. A deviation for 1966.0 is noted. No correlation is found between earthquakes and changes in rotational speed or acceleration.

Measurement-sensing device for determining a rotational speed or rotational speed change, preferably of vehicle wheels

Abstract: A measurement sensing device for detecting a rotational speed or rotational speed change, particularly of vehicle wheels, which essentially consists of a rotor and of a stator constructed as magnet and equipped with an annular coil, whereby an A.C. voltage proportional to the rotational speed is induced in the stator by the rotation of the rotor; the rotor and stator are thereby so combined into a structural unit that the rotor is so rotatably supported relative to the stator at the latter or at a part connected therewith that during operation no changes in radial or axial spacing between rotor and stator occur.

Safety device for limiting the rotational speed of internal combustion engines

Abstract: An electronically controlled diesel engine wherein the highpressure chamber of the fuel injection pump is connected with the low-pressure chamber by a passage controlled by an electromagnetic valve which opens or closes when the rotational speed of the engine reaches a maximum permissible value. The speed is detected by an electrical counter which effects opening of the valve if the latter is installed in a passage which conveys fuel from the high-pressure chamber, or closing of such valve if the latter is installed in a passage which supplies fuel to the high-pressure chamber, whenever the engine speed reaches the maximum permissible value. The electrical connection between the speed counter and the valve comprises an amplifier whose input circuit contains an inductance of the speed counter and a first safety fuse and whose output circuit contains a relay switch for the circuit of the winding in the valve and a second safety fuse. The circuit of the winding can be completed by an auxiliary switch in response to actuation of the starter for the engine.

Self-aligning sensor

Abstract: An electrical rotational speed sensor constructed to provide an electrical signal indicative of the rotational speed between a pair of members one of which is supported for rotation relative to the other and having a rotor connected to the rotatable member and a stator connected to the other stationary member and having a mounting structure for the rotor and stator whereby one of the rotor and stator can move radially in response to radial movement of the other of the rotor and stator as a result of relative movement between the two members.

Electronic synchronizing system employing plural switched oscillators

Abstract: The rotational speed and position of one synchronous motor is synchronized with the rotational speed and position of another synchronous motor by electronically comparing the time occurrence of respective pulses produced by each motor. The time occurrence of pulses from the one motor relative to pulses from the other motor is used to speed up or slow down the one motor until its speed and position are synchronized with the speed and position of the other motor. When the one motor is synchronized with the other motor, the one motor may then have its speed controlled by fixed means.

Variable diameter centrifugal pulley with means to vary the mass of centrifugal weights

Abstract: A variable diameter centrifugal pulley for use as a drive pulley in a variable speed belt and pulley transmission for snowmobiles and other vehicles, of for any machinery requiring a variable speed transmission, wherein the centrifugal weights consist of blocks provided with a cavity, closure means for said cavity, and calibrating elements removably inserted within said cavity, in order to vary the mass of the centrifugal weights, and thus adjust the rotation speed at which clutching takes place and the variation of the belt diameter on the pulley with change in the rotational speed of the pulley The pulley also has a spring in which the increase of its resisting force is a non-linear function of the amount of its shortening so as to obtain belt declutching during engine deceleration at substantially the same rotational speed as during engine acceleration

Method and apparatus for protecting production of textured textile yarn

Abstract: Continued production of improperly processed textile yarn otherwise resulting from rotation of a spindle at an improper speed is protected against by a method and apparatus in which the rotational speed of the spindle is continually monitored and rotation thereof at an excessive differential in speed from a predetermined standard speed initiates a warning that improperly processed yarn is being produced.

Wheel slip limiting apparatus with mechanical control

Abstract: The maximum traction of a vehicle during acceleration is assured by a wheel slip sensitive variable duty cycle centrifugal switch for periodically interrupting engine ignition by an amount proportional to wheel speed difference so that if excessive slipping of the driven wheels occurs, the engine torque output is reduced to limit the wheel slip. A mechanical differential has inputs driven according to non-driven and driven wheel speeds and a carrier with a rotational speed proportional to the difference in wheel speeds. The centrifugal switch is operated in response to the carrier speed.

Method of an apparatus for semi-hot forming of metallic workpieces in a rolling operation

Abstract: In a semi-hot forming operation, a workpiece is supported between two tool rollers which are rotated in the same direction. During the rotational cycle of the rollers the workpiece is first electrically preheated to a desired temperature after which the forming operation takes place. The contact pressure between the rollers and the workpiece is relatively low during the preheating operation and is increased when the roll forming takes place. To heat the workpieces effectively, the rotational speed of the roller can be varied to preheat at a regulatable reduced speed and then to form the workpiece at an increased rate of speed. The circumferential surfaces of the rollers are segmented with a smooth portion and a profile portion, with the preheating taking place when the smooth part of the rollers are in contact with the workpiece and the forming taking place when the profile portion is in contact with the workpiece.

Kinetic energy device for forming work pieces

Abstract: A kinetic energy device at substantial rates of speed develops an apparent hardness which is considerably in excess of its inherent hardness. A rotatable member having a plurality of protuberances and consisting of metal or other suitable composition, will develop properties at high rate of speed which is a function of the speed itself, thus the material comprising the protuberances takes on apparent hardness many times that of the same material in a static condition. The present invention utilizes this property of high speed in the order of 10,000 100,000 surface feet per minute rotational speed, to develop apparent hardness in the projectiles on the periphery of the machining wheel so that the designer has not only available to him a wide range of materials which were heretofore impractical to use in machining operation, but also has the ability to use a kinetic energy device in such applications as stock removal, wherein the working piece, i.e., the kinetic energy possessing piece can perform its intended function at lower wear rate, at lower temperatures, the product removed is in a more desirable size or form, and the work piece is formed without causing mechanical rupturing of the total work piece or other objectionable damage thereto.

Method and apparatus for generating a control signal for use in a vehicle brake system

Abstract: A method and apparatus for generating and using pseudo vehicle speed signals for use with an anti-skid brake control system. A signal responsive to the rotational speed of a vehicle wheel is generated and used for producing a pseudo vehicle speed signal. A memory is used to store the pseudo vehicle-speed signal and the memory is discharged at a rate dependent upon the applied brake pressure of the brakes of the system. The value stored in the memory is compared with the wheel-rotational speed to control the anti-skid brake control system.

Glassware cooling and transfer apparatus

Abstract: Articles of glassware manufactured by an automatic apparatus are taken out from finishing molds of the apparatus and held temporarily by take-out assemblies until they are cooled to such temperature that they no longer undergo deformation. The articles, then placed onto turntables in rotation and further cooled thereon, are transferred, in equidistant arrangement, onto a belt conveyor which is driven at a velocity higher than the rotational speed of the turntable by means of delivery arms adapted to be rotated at a progressively increasing velocity.

Sensor with constant airgap

Abstract: An electrical sensor for sensing rotational speed between a pair of relatively rotatable members with the sensor including a pair of relatively rotatable poles being mounted, such that there will be substantially no change in airgap despite relative radial and axial movement between the relatively rotatable members.

Operating rotating traveller rings of ring - spinner

Abstract: Spinner has low-friction, pref. air-bearing rings, not driven from the spindle drive. The spindle acceleration is controlled so that the rotation speed difference between spindle and ring does not exceed a max. value and decreases constantly throughout spinning, as in DT 1812028. The ring speed is controlled by a braking force such that the ring speed is always smaller than the traveller speed.

Detection arrangement of winding speed on a take-up winder

Abstract: Improvement in or relating to an arrangement for detecting winding speed of running strandular materials on a multiple packages on a common spindle type take-up winder having multiple compensator arms with dancer rolls for the strandular materials independently operable, upon speed deviation of the strandular materials, on a common shaft connected to a unit for controlling the spindle rotational speed and the detection is carried out with possible minimum tension fluctuation within and/or between the strandular materials.

Method and apparatus for testing pneumatic tyres

Abstract: 1,212,701. Testing tyres. DUNLOP CO. Ltd. 3 Jan., 1968 [7 Jan., 1967], No. 1024/67. Heading B7C. [Also in Division G1] Data enabling the variations in drag force set up during rotation of a tyre to be calculated is obtained by rotating the tyre in contact with a rotatable drum, the axes of rotation of tyre and drum being parallel to each other and constrained during measurement to a fixed separating distance, measuring periodically the instantaneous speeds of rotation of tyre and drum or the relative speeds thereof, and comparing these speeds to register variations between them from which variations in drag force may be calculated. The representations of the instantaneous speeds may be registered on an X-Y plotter, which may be mechanical or electrical. Alternatively, the X-Y plotter may be replaced or supplemented by an oscillograph. In a typical example, twin opposed bevel gear-wheels are drivably connected to wheel and drum so that the drive to one gear-wheel is in a contrary sense to the other, and the gear-wheels are interconnected by an interposed pair of planet bevel gears freely rotatably mounted on a common shaft carried by a cage so that the instantaneous relative rotational speed of wheel and drum is determinable from the instantaneous rate of rotation of the cage. The variation is examined by using a mechanical X-Y plotter, the X-axis representing the speed of rotation of the wheel and the Y axis representing the speed of rotation of the cage. Departure from a straight line plot indicates variations in effective rolling radius. In other examples, electrical analogues of the gear system are used. Specification 951,606 is referred to.

Motion picture projector excess rotational speed detector

Abstract: The invention is an electronic system which senses the rotational speed of the takeup reel of a motion picture projector during operation. If the speed is higher than normal due to breakage, absence of or end of film, the device operates to shut down the projector and/or provide an audible or visible warning.

Asymptotic analysis of a nonlinear autonomous vibratory system

Abstract: A system consisting of a spring, dashpot, and mass upon which is mounted an eccentric driven by a motor with a linear torque-speed characteristic, is analyzed by perturbation procedures based on small reciprocal of rotational inertia. Periodic solutions of the third order system, which arises when the angular position of eccentric mass is taken as the new independent variable, are constructed, and their stability is analyzed. An asymptotic solution is also obtained which is more general than a periodic solution, in that the averaged rotational speed is a slowly varying function, rather than a constant. The results are applicable to the determination of the interaction between the rotational motion of a flexibly mounted motor and the translational vibratory motion of its frame.

Improvements in and relating to torsional vibration dampers

Abstract: 1,211,072. Torsional vibration dampers. POWDER COUPLINGS Ltd. 9 Oct., 1967 [7 Oct., 1966], No. 44984/66. Heading F2S. A torsional vibration damper for a rotary shaft consists of a circular section housing 4 and which is capable of free rotation with respect to a member 8 which is mounted within the housing for rotation relative thereto about the housing axis. The housing also contains particulate solid material such as metal shot 9 which constitutes friction coupling means between the member 8 and housing 4 so that when the member 8 is driven by a shaft 2 the housing 4 rotates with it. The frictional coupling torque varies with rotational speed in consequence of the dependence of closeness of packing of the shot on centrifugal force. If, at a particular speed of rotation, the housing and member 8 are rotating together there is no tendency for the shot particles to rub against each other, but a change in rotational speed of the driven member will disturb this equilibrium and cause energy to be dissipated by friction between the shot particles. Thus torsional oscillations of the driving shaft will be frictionally damped. An outer cover 11, Fig. 2 (not shown), may be secured to the hub 1 of the member 8 and surround and enclose the housing 4.

The Dynamic Characteristics of a Turborotor Simulator Supported on Gas-Lubricated Foil Bearings—Part 2: Operation With Heating and Thermal Gradients

Abstract: A high speed rotor, supported by gas-lubricated foil bearings, is free from self-excited whirl and displays no loss of load capacity when vibrated at frequency equal to the rotational speed. It is demonstrated that in addition to tolerance of geometrical imperfections, misalignment and foreign particles, the foil bearing performs well at elevated temperatures and accommodates appreciable temperature gradients. The foil bearing is endowed with superior wipe-wear characteristics and the flexibility of the foil accounts not only for the stability of the foil bearing, but also for its accommodation of, and compensation for, distortion, contamination, and contact.