Showing papers on "Rotational speed published in 1972"

Device for preventing the spinning of the driven wheel of a vehicle

Abstract: A system for preventing the spinning of the driven wheels of a vehicle, especially of a motor vehicle in which a generator is provided producing an electrical voltage proportional to the wheel rotational speed of the associated wheel; a differenceforming element is connected to the generators of a respective vehicle side which supplies an electrical voltage proportional to the wheel rotational speed difference of a driven and non-driven wheel, this signal being applied either in an analog or digital manner to an actuating element decreasing the engine torque and/or to the actuating elements influencing the brakes of the driven wheels.

Device for prevention of spinning of the driven wheels of a motor vehicle

Abstract: A system for preventing the spinning of the driven wheels of a motor vehicle, in which each wheel is equipped with a generator producing an electrical voltage proportional to the wheel rotational speed and in which the control voltage for the control of the driving or brake force is produced by a comparison of the voltage of a driven and of a non-driven wheel when exceeding a predetermined slippage threshold; the control voltage is obtained by feeding the voltages of the generators of the non-driven wheels to a respective differential amplifier while the voltages of the driven wheels are fed to the corresponding differential amplifier by way of a voltage divider whereby the ratio of division of the voltage divider is adjusted by a control device operated in dependence on the rotational speed of the corresponding non-driven wheel.

Measurement of speed of rotation by sonic and ultrasonic frequencies spectrum

Abstract: Apparatus and process wherein the center frequency of the narrow-band level peak of the sonic and ultrasonic spectrum produced by the false-twisting machine, which is directly proportional to the rotational speed of the spindles, is used for rotational speed measurement on false-twist spindles.

Rotating object breakage test apparatus

Abstract: Rotating object breakage test apparatus for testing the strength and recording the mode of breakage of a rotating object. The object is mounted upon a spindle supported by gas bearings and is located within a dark shelter. An electrical conductor connecting an electric source with an electric vibrator is fixed upon the object so that when the object is broken by the centrifugal force applied thereto,the conductor is also cut or broken in order to stop the electric supply to the vibrator. By detecting interruption of the electric supply, the exact instant of the breakage of the rotating object is recorded,whereby the strength of the rotating object is detected by recording the rotational speed thereof, while the mode of breakage thereof is recorded upon a photograph.

Electronic speed regulator for internal combustion engines

Abstract: An electronic rotational speed control device for internal combustion engines of large power output with a desired-value adjustment for the rotational speed and filling of the internal combustion engine, a desired-actual-value comparison of the rotational speed, a control stage, an amplifier, and adjusting member with a servo-valve for the filling control which is provided with a motion pickup and a feedback; a pure rotational speed control stage with P-I-D behavior or a filling-rotational speed control stage can be selectively engaged while between the control stage and amplifier a filling-limit signal intended to limit the engine filling is compared with the filling-signal produced by the control stage whereby the respective smaller signal is transmitted to the amplifier; two measuring systems are provided for the rotational speed measurements which are utilized selectively for the supply of the rotational-speed existing-value and which can be connected by way of an OR-circuit so as to act, in case of excess rotational speed, on a stoppage mechanism of the internal combustion engine.

Aircraft starter control system

Abstract: A control system for automatically closing a solenoid-operated air valve that supplies pressurized air to rotate an air turbine starter motor of an aircraft engine when the starter rotor reaches a predetermined rotational speed. The control system senses rotation of the starter rotor and produces a pulse train wherein each of the pulses generated has a duration which is a function of the rotational speed of the starter rotor and compares each pulse duration to a reference pulse which corresponds to a predetermined rotational speed of the starter rotor. When the duration of the rotor pulses decreases to a point where they are shorter in duration than a reference pulse, the supply of pressurized air is removed from the starter, thereby removing power from the starter at the predetermined speed.

Automatic load control system for hydraulic rotary power absorbers

Abstract: An automatic load control system is described for controlling the retarding force characteristics of a rotary power absorber such as a dynamometer in which the absorbed torque varies with the level of fill of the working fluid. The load control system includes a speed signal generator such as a tachometer coupled to the dynamometer for generating a speed signal representative of the rotational speed. A torque signal generator in the form of a strain gauge or other transducer is connected to the dynamometer to provide a torque signal representative of the absorbed torque. Load and unload control mechanisms such as electrically operated valves are connected between the power absorber and a source and sink for controlling the flow of working fluid into and out of the absorber and thereby the value of the absorbed torque. A flow control means controls the valves in accordance with the values of the speed and/or torque signals to thereby control the level of working fluid within the absorber to cause the absorbed torque to vary in a predetermined manner, e.g., as the square of the speed changes. An adjustable torque means is coupled to the flow control means for adjusting the absorbed torque to a selected value at a given speed. The dynamometer may also be provided with a plurality of flywheels and electrically operated means for selectively engaging one or more flywheels with the absorber rotor to simulate the inertia on an engine or vehicle under test.

Spread rate controller

Abstract: Apparatus for sensing the rotational speed of a shaft and positioning a control device in a position predetermined relative to the speed of the shaft, the apparatus being particularly suited for the operation of mobile spreading equipment in which the spreading rate is controlled relative to the drive shaft speed of the vehicle. The controller converts the rotational speed of the shaft and the position of the control device to comparable electrical signals which are then compared to produce a resultant to effect further positioning of the control device. Both linear and nonlinear weighting is applied to produce the desired function in the resultant.

Granulation of high melting pt materials - by impact dispersion

Abstract: High m. p. materials, esp metallurgical slags, rocks or metals, are granulated by pouring of melt onto a rotating centrifugal accelerator. Particles free from internal stresses and of the required particle size are obtained by the adjustment of the rate of flow of the melt stream at the point of impact on the circular path of the accelerator and/or of its rotational speed, which imparts a ballistic trajectile to the melt during which it solidifies in the atmosphere provided. In the prefd. version the plant consists of a horizontal slide mounted channel for the melt and a horizontal axis bucket wheel with adjustable speed of rotation. The sloping floors onto which the solidified particles drop are provided with sieve surfaces through which to drop. The process does away with the need for thermal after treatment of granulated material.

Speed and tension control for yarn winder

Abstract: The speed control includes a tension sensing element which is positioned in advance of the wind-up package to detect variations in tension of the yarn as it approaches the package. The rotational speed of the wind-up package is varied in response to a variation in tension in the yarn to thereby maintain uniform linear speed in the yarn being wound onto the wind-up package. A drive roll is positioned beneath and rotates the wind-up package by surface contact with the yarn and the wind-up package is normally maintained against the drive roll with a predetermined driving force and the control means operates to reduce the pressure and the driving point of the wind-up package against the drive roll and thereby decrease the rotational speed of the wind-up package in response to any increase in tension in the yarn approaching the wind-up package.

Turbomolecular Pump of Vertical Design of 350 liter/sec Pumping Speed

Abstract: Design and properties of a turbomolecular pump which has been conceived for optimum performance as an answer to present-day technological requirements are described. The features of the vertical unidirectional flow and the direct drive shaft of high rotational speed offer many advantages. Compact design, quiet running, high pumping speed, and compression ratio are the most important characteristics. The physical properties of the pump have been optimized and tested. The blade wheels, blade angle, and the number of stages have been calculated for optimum performance by means of a computer. The performance data obtained from tests on a series of pumps, pumping speed, compression ratio, starting time, power consumption, etc., are explained and discussed.

Percussive drilling with independent rotation

Abstract: The Bureau of Mines conducted drilling experiments in the laboratory with a commercially available percussive drill that has an independent rotational system. Eight rock types with a wide range of physical properties were drilled under several combinations of rotational speed, drilling thrust, and operating pressure. Penetration rates and energy per unit volume correlated well with the coefficient of rock strength as shown graphically. Size-distribution analyses of some of the drill cuttings show how particle size varies with rotation speed and rock hardness. In general, changing the rotational speed has a greater influence on the penetration rate in softer rocks, with penetration rate increasing with increasing rotational speed.

Balancing apparatus for rotating bodies and method of producing frequency stable phase delay

Abstract: Apparatus through which the orientation of an unbalancing mass of a supported rotating body may be determined electronically. In arriving at the orientation determination a signal is generated corresponding to the resulting vibratory motion of the unbalanced rotating body, a frequency stable phase delay is produced by the electronic system and is applied to the generated signal, and a stroboscopic light is triggered by the delayed signal so as to illuminate the rotating body periodically and is coordinated with the known fact that in a rotating unbalanced body there is a 90* lead between the forcing function produced by the rotational velocity and position of the unbalancing mass and the resulting vibratory acceleration of the body when the rotational speed coincides with the natural resonant frequency of the supported rotating body.

Apparatus for cutting rings from tubes

Abstract: An apparatus for cutting rings from a tube comprises a mandrel for receiving the tube and a disc-shaped tool-holder carrying at its periphery a number of spaced cutting edges. The mandrel is rotated around its longitudinal axis at a constant rotational speed and makes one revolution while any one of the cutting edges is in cutting engagement with the tube. The tool holder is rotated around a predetermined axis at a lower constant rotational speed and simultaneously fed parallel to the tube at a constant linear velocity. The feed velocity and the rotational speed of the tool holder are adjusted to each other so as to permit the cutting edge in cutting engagement with the tube to move in a plane perpendicular to the tube axis.

Speed responsive transmission

Abstract: This invention relates to improvements in a control mechanism for fluid-operated automatic speed change mechanisms of an automotive vehicle which comprises a fluid coupling having a pump wheel and a turbine wheel, with an adjusting valve adapted for increasing the hydraulic line pressure in response to a signal from a first sensor sensing an increase in the rotational speed of the pump wheel and adapted for decreasing the hydraulic line pressure in response to a signal from a second sensor adapted for sensing an increase in the rotational speed of the turbine wheel.

Collision sensor for motor vehicle safety device

Abstract: A deceleration-sensitive switch adapted to be closed by movement of a weight at the time of a collision. An electromagnet normally keeps the weight away from the switch to open it. The electromagnet is supplied with a current signal varying in magnitude with vehicle speed, so as to vary the minimum deceleration above which the weight is released from the electromagnet to close the switch. The current signal is obtained through proper processing of a vehicle speed signal proportional to the rotational speed of a vehicle wheel. In order to compensate for the deviation of the detected vehicle speed from the actual value that would occur when the vehicle wheels are suddenly locked by the brackes, the vehicle speed signal is arranged to decrease at a certain rate during a rapid decrease of the wheel''s rotational speed.

Friction welding apparatus

Abstract: Friction welding apparatus for welding together workpieces of relatively small diameter, thus requiring relatively high rotational speed of one of the workpieces, there being angular contact bearings including pre-load biasing means for urging such bearings in a given direction to maintain such contact bearing operational wherein a high speed rotor or spindle is employed for rotating workpieces at its opposite ends and non-rotatable workpieces are substantially simultaneously brought into engagement from opposite ends. More particularly, such apparatus comprises high speed bearings which are preloaded with a force which is substantially constant throughout any imbalance of forces on or movement of the rotor due to imprecise engagement of said non-rotatable elements with said rotatable elements.

Magnetic tape driving system

Abstract: A magnetic tape drive system for maintaining a tape supply reel at a predetermined rotational speed during the first half of a fast tape winding operation while maintaining a tape take-up reel at the predetermined rotational speed during the second half of the fast tape winding operation, which system includes a fast control circuit responsive to the rotational speed of a first motor driving the tape supply reel and a second control circuit responsive to the rotational speed of a second motor driving the tape take-up reel, the first and second control circuits having an electrical valve which is connected to the second motor and which controls the torque of the second motor in dependence on operating conditions of said first and second control circuits.

Flight measuring apparatus

Abstract: This invention relates to an apparatus for simultaneously measuring the angle of incidence, the angle of sideslip, distance covered along a flight path and air speed of an aircraft which comprises a body, a rotatable nose portion mounted on the body and having propeller blades thereon, a tail assembly mounted on the body, a support for connection to an associated aircraft, a Cardan joint mounted in the body in the center of gravity of the apparatus and connecting the body to said support, electrical means adjacent to the Cardan joint for measuring angles of rotation between the support and the body in two orthogonal directions, said electrical means including an element mounted on said support and an element mounted on said body, photoelectric measuring means in the body for measuring the number of revolutions of the nose portion, and means for converting the number of revolutions to determine the flight distance and the air speed from the rotational speed of the nose portion and the pitch of the propeller blades, and to count the revolutions of the nose portion within one unit of time.

Some factors affecting the rotation of a dielectric in an electrorheological medium

Abstract: It has been shown experimentally that the rotational speed of a dielectric in a nonconducting disperse medium depends on the concentration of the disperse phase and on the electrode geometry. The results are compared with those pertaining to the rotation of a dielectric in a pure homogeneous nonconducting fluid.

Variable speed transmission

Abstract: A positive-drive, infinitely variable speed transmission has been invented. The variation in speed may range from zero to any multiple of the input speed. The rotational speed of the output shaft may be varied from zero to a desired speed of rotation in either a clockwise or counterclockwise direction. The novel transmission comprises a set of four cones arranged in pairs with each pair encircled by a drive chain which is driven by said cones. The center adjacent cones of each pair are in contact with one another through a gear which meshes with the drive chain to drive a shaft connected to an external gear in contact with a planetary gear attached to the input drive shaft. The input drive shaft also drives the cones, which in turn, drive the drive chain. By varying the distance between the center adjacent cones, the center gear in contact with the drive chains is driven at various speeds depending upon the position of the chain on the cones. A sliding tooth is engaged in a keyway in the surface of each cone to provide a drive means for driving the drive chain no matter what position the chain occupies on the surface of the cone. The separation between the center adjacent cones can be accomplished by manual or power assist means. The regulation of the distance between the center cones determines the direction and speed of the output shaft for a given speed of the input shaft.

Internal resistance fluid clutch

Abstract: A transmission in which the input and output shafts are coupled by a fluid drive which is pressurized by eccentrically driven pumps, the variable speed fluid coupling being effective until a particular rotational speed is reached, at which speed the drive is positively locked. Means is also provided for locking the driven selectively at any speed. The transmission can be shifted between forward and reverse positions, and the shift mechanism incorporates braking means to facilitate gear engagement, and locking means operable in a stopped position, the arrangement being particularly adaptable to automotive vehicles.

Antiskid control system

Abstract: A vehicular antiskid control system comprising an inertia wheel whose rotational speed represents a computed vehicle speed, driven by a shaft coupled to at least one of vehicle''s wheels, through a one-way clutch, braking device to decelerate the inertia wheel in a deceleration which corresponds to vehicle''s deceleration and device to divide the shaft''s rotational speed by the rotational speed of said inertia wheel and issues a command when the quotient is below a certain numerical value.