Showing papers on "Rotational speed published in 1985"

A Theoretical Model for Rotating Stall in the Vaneless Diffuser of a Centrifugal Compressor

Abstract: A theoretical model for rotating stall in the vaneless diffuser of a centrifugal compressor is presented. It consists of a time-evolutive calculation of the strong interaction between the inviscid flow core and the unsteady boundary layers along the walls. It is shown that, depending on the diffuser geometry and the diffuser inlet flow angle, a transient perturbation of the outlet static pressure will generate a rotating flow pattern, if the periodicity of this perturbation corresponds to the experimentally observed number of cells. The relative rotational speed and the phase relation between the velocity and the flow angle variations are also in agreement with experimental data.

Continuously variable transmission apparatus for automobile

Abstract: In a continuously variable transmission apparatus for a vehicle having a slip type clutch disposed between a drive shaft of an engine and an input shaft of a continuously variable transmission mechanism, a torque detecting device to detect torque of the engine, an engine speed detecting device to detect rotational speed of the engine, an output shaft speed detecting device to detect rotational speed of an output shaft of the slip type clutch, a vehicle speed detecting device to detect running speed of the vehicle, and an electronic control device to control the continuously variable transmission mechanism and the slip type clutch according to signals from the detecting devices are provided. The slip type clutch control device is controlled to give a reference amount of slip determined according to driving condition of the vehicle, and speed ratio of the continuously variable transmission mechanism is controlled to a value determined primarily on the basis of control signal of the slip type clutch.

Video recording apparatus having low and high resolution operational modes

Abstract: Video reproduction apparatus such as a video cassette recorder which is operable in either a first conventional mode or a second high resolution mode. The apparatus includes processing circuitry for selectively processing video signals either of a first conventional format of reduced bandwidth, or of a second time-division-multiplex (TDM) format of higher bandwidth than the first format. A capstan is provided for moving magnetic tape along a path at a first speed and at a second speed greater than the first speed. A magnetic transducer carried on a drum is located along the tape path and is rotated at a first rotational speed and at a second rotational speed, greater than the first rotational speed for recording and playing back video signals in parallel tracks on the magnetic tape. Control structure and circuitry are provided for controlling the processing circuitry, the capstan, and the magnetic transducer drum so that they are operable in at least first and second modes. In the first mode, the processing circuitry processes video signals of the first format, the capstan moves the tape along the path at the first speed and the maganetic transducer drum is rotated at the first rotational speed to record and/or playback video signals of said first format on the magnetic tape. In the second mode, video signals of the second format are processed by the processing circuitry, the capstan moves the tape at the second tape speed and the magnetic transducer drum is rotated at the second rotational speed to record and/or playback video signals of the second format on the magnetic tape.

Electronic control system for a variable displacement pump

Abstract: An electronic control system for a variable displacement pump comprises apparatus for sensing the actual position of the displacement determinative element and the actual rotational speed of the pump cylinder block, and for producing representative signals which are combined to produce a signal indicative of actual output flow rate The displacement determinative elements position and the cylinder rotational speed are sensed directly by sensors mounted within the housing of the pump The speed sensor is disposed in close proximity to, and aligned with marks inscribed on, the outer surface of the rotatable cylinder block The volumetric efficiency of the pump is also sensed by and used to determine the actual flow rate

Instrumentation Package for Monitoring Tractor Performance

Abstract: AN instrumentation package was developed to monitor tractor performance on a John Deere 4440 tractor. Performance variables measured included front and rear wheel rotational speed, ground speed by Doppler radar, engine speed, differential speed, drawbar pull, axle torque, and fuel consumption. Speed comparison tests were conducted to determine relative differences between travel speed sensors (front wheel and Doppler radar) and clocked measurements. Travel speeds obtained by using the front wheel sensor were 4 to 15% less than timed speeds. The percent difference between radar ground speeds and clocked speeds were small on smooth surfaces. For infield conditions, radar ground speeds deviated from clocked speeds by an amount approximately equal to the pitch of the tractor. Results of field performance tests were documented for three tractor/implement combinations. When pulling a JD 230 tandem disk, tractive efficiency and engine load increased 10.6% and 33.4%, respectively, when the operating gear was increased from second to third. Specific fuel energy requirements decreased 24.6%. When shift up and throttle back techniques were practiced, specific fuel consumption decreased 14.8% when pulling a JD 340 offset disk and 8.3% when pulling a JD 100 chisel plow.

Power transmission system for vehicle

Abstract: The present invention relates to a power transmission system for a vehicle of the type in which front and rear wheels are driven by a sole engine. In order to control the distribution of drive torque produced by the engine to front wheel side and rear wheel side of the vehicle according to a difference in rotational speed between both sides and in relative rotational direction between both sides, the power transmission system includes an oil pump adapted to be driven by a first rotational shaft which transmits a driving torque from an engine to front wheels of the vehicle and a second rotational shaft which transmits the driving force to rear wheels of the vehicle. The oil pump produces an oil pressure proportional to the difference in rotational speed and has at least two ports. A clutch mechanism couples the rotational shafts with each other by the discharge pressure of the oil pump and, the clutch mechanism is disposed between the rotational shafts. An oil pressure control system controls the discharge pressure fed from the oil pump to the clutch mechanism to adjust the coupling force of the clutch mechanism in accordance with the difference in the relative rotational direction between the pair of rotational shafts.

Method and apparatus for detecting axial cracks in rotors for rotating machinery

Abstract: Axial cracks in the rotor assembly of a variety of rotating machinery are detected while the rotor is being rotated, by sensing mechanical vibrations of the rotor at a location along the length thereof to produce a corresponding rotor vibration signal. A background vibration signal representing the vibration response at an earlier time is provided, as well as a monitor vibration signal representing the vibration response of the rotor at the time the monitor signal is obtained. A speed-dependent first harmonic difference signal is found by vectorially subtracting the first harmonic of the background vibration signal from the first harmonic of the monitor vibration signal. The relationship between the amplitude of the difference signal and the rotational speed of the rotor is then determined for rotational speeds away from the speed at which vibrational resonance occurs, with a relationship wherein the difference signal is proportional to the fourth power of the rotational speed being indicative of the presence of an axial crack in the rotor assembly. Histogram techniques improve the signal-to-noise ratio of the background vibration signal and of the monitor vibration signal. The vibration response of the rotor assembly at rotational speeds near the resonance speed may be utilized in conjunction with the response at speeds away from the resonance speed, in order to confirm the presence of a rotor crack.

Method and apparatus for controlling different operational parameters for pumps and compressors

Abstract: The invention relates to a method and an apparatus for controlling various operating parameters, re insbesonde the delivery height H, the flow rate Q, the needs for supplies Leistungsbe P and the rotational speed n, in pumps and compressors, preferably centrifugal pumps and fans. According to the known prior art, the control variables for regulation of the flow rate Q and the head H are measured in the medium itself. The sensors are spruchungen at their place of work powerful Bean, and causing extensive measuring technology significant cost. The invention solves these problems in that the control according to characteristics of the operating parameters according to the desired operating mode, wherein the measurement of individual operating parameters for the calculation of the manipulated variable voltage outside the fluid takes place. Advantageously, the rotational speed n and the Lei stungsbedarf P as electric variables to describe the characteristics used. The characteristic curves or characteristic fields are determined are permanently programmed in a computer.

Method of controlling hydraulic pressure for an automatic transmission gear system

Abstract: In an automatic transmission for a vehicle in which frictional engaging elements are selectively actuated by application of a hydraulic pressure for stopping the rotation of a selected one of rotary elements relative to the others thereby changing over the speed ratio, and the hydraulic pressure is subjected to feedback control so that an actual changing rate of the rotation speed of the rotary element can follow up a predetermined reference rate for attaining an ideal speed shift, an initial hydraulic pressure to be supplied to a specific frictional engaging element in the starting stage of a succeeding speed shift is decided on the basis of the detected value of the hydraulic pressure supplied to the specific frictional engaging element in a preceding speed shift. Thus, even when the capacity of the automatic transmission does not primarily match that of an engine combined therewith, the initial hydraulic pressure supplied to the frictional engaging element can be quickly converged to an appropriate value with high accuracy, and the automatic transmission can be satisfactorily combined with any one of engines having different capacities.

Hydraulic control device for wind turbine

Abstract: A hydraulic speed control device for limiting the speed of a wind turbine rotor by controlling the deployment of rotor braking devices includes four fluidicly interconnected elements: one or more fluid cylinders, a relief valve, an accumulator, and a check valve. Each of the fluid cylinders is mechanically coupled between a blade and an associated rotor braking device, and controls the movement of the rotor braking device between its aligned and braking positions. The relief valve opens to fluidicly connect the fluid cylinders and the accumulator when the rotational speed of the rotor exceeds a limit value. The accumulator receives fluid through the relief valve when the relief valve opens, thereby reducing the fluid pressure in the fluid cylinders and allowing the rotor braking devices to move from their aligned positions to their braking positions. The check valve permits fluid flow from the accumulator toward the fluid cylinders to return the rotor braking devices to their aligned positions when the rotational speed of the rotor has sufficiently slowed.

Continuous flow type homogenizer

Abstract: There is provided a continuous flow type homogenizer. The homogenizer comprises, a tubular container having at upper end thereof an inlet for introducing tissue to be homogenized and at lower end thereof an outlet for discharging the homogenized tissue, a pestle disposed freely rotatable in the tubular container with a clearance defined between the inner surface of the tubular container and the peripheral surface of the pestle, a rotation shaft driving means connected to a rotation shaft of the pestle, a speed setting means for setting the rotation speed of the pestle, and a speed controlling means for controlling the speed of the rotation shaft with a predetermined speed gradient with respect to a speed value set by the speed setting means. '

Wobble-die forging machine

Abstract: In the upper part of the wobble-die forging machine, a guide spigot of the bell-shaped upper die mounting engages, for the production of circular rocking movements, by way of self-aligning roller bearing means into a first eccentric sleeve, which is rotationally guided by way of further bearing means in a second eccentric sleeve supported by way of bearing means at the machine frame. In this case, the first eccentric sleeve stands in driving connection by way of coupling means with the shaft of a first motor and the second eccentric sleeve stands in driving connection by way of cogwheel means with the shaft of a second motor, wherein the one and/or the other of the motors is or are regulable in respect of rotational speed and rotational direction through a common control equipment. Thereby, an arrangement is attained, the build-up and thereby the expenditure of which is substantially smaller compared with the state of the art and which requires less constructional volume and permits a desired regulation of rotational speed and rotational direction of the eccentric sleeves.

System for rotationally slaving an optical fiber feeding and dispensing device in a cabling line

Abstract: In an optical fiber cabling line where a ring having helical grooves is drawn at a constant translational speed by a main motor, there is provided a system for slaving a rotational speed of an optical fiber feeding and dispensing device driven by motor means to a number of ring groove pitches per second in order to compensate for groove pitch fluctuations resulting from the ring production process. The system comprises roller and cam means coupled to the ring and to the feeding and dispensing device for detecting a difference between the rotational speed and the number of pitches per second thereby converting the speed difference into a voltage variation. The motor means comprises a differential coupled to a gearbox connected to the main motor, and a corrector motor linked to the detecting means so as to drive rotationally the feeding and dispensing means at a rotational speed proportional to a rotational speed set by the gearbox and continuously corrected by the detected speed difference.

Control system and method for an automatic transmission providing smooth engagement action

Abstract: A control system for an automatic transmission system for a vehicle is adapted to control a partial clutch condition of one of two friction engaging devices which are oppositely engaged and disengaged in shifting the transmission from one speed stage to another speed stage, the control being such as to engage or disengage the one friction engaging device gradually by repetitive incremental increase or decrease of actuating fluid pressure supplied to the one friction engaging device while repetitively watching the rotational speed of a rotational element in the transmission during small time intervals. The gradual increase or decrease of the actuating fluid pressure in the one friction engaging device proceeds consistently as long as the rotational speed of the rotational element changes consistently but is temporarily reversed when the change of the rotational speed of the rotational element has deviated from its consistent trend of change as reflecting by the incremental increase or decrease of the actuating fluid pressure getting too high to maintain a smooth shifting between the speed stages.

Induction-type planetary reducing coupling for very high speed rotating machines

Abstract: In this gearless, induction-type planetary reducing coupling, electric currents induced in the collars of the driving rotor react with the inductive magnetic field carried by the self-excited planet wheels causing the planet wheel hubs to roll along circular tracks. Skidding is prevented by similar electromagnetic interaction in other, stationary rings. Said rolling action drives planet wheel carriers attached to the output shaft, effecting a power take-off with speed reduction from a very high rotational speed. The device is thus suitable for miniature turbines, whether driven by gas or steam, operating too fast for mechanical gear trains, and can be used to manufacture low-cost turbomotors and turbogenerators, for example using existing turboblowers converted into gas turbines by adding a combustion chamber and burner; this coupling, being reversible, serves as the starter therein.

Apparatus for heating fluid by burning liquid fuel

Abstract: An improved apparatus for heating fluid by burning liquid fuel is disclosed. To heat fluid such as water, air or the like medium heat exchanging is effected between the combustion chamber in which liquid fuel is burnt with combustion air introduced therein and the fluid passage through which fluid to be heated flows. The apparatus includes means for controlling rotational speed of a single motor for rotating the fuel pump and the blower, means for controlling a flow rate of fuel to be pumped from the fuel pump, means for controlling a flow rate of combustion air and an electronic control unit into which a variety of parameters relative to the above-mentioned means are inputted. The parameters are processed in the electronic control unit to individually control the means for controlling rotational speed of the motor, the means for controlling a flow rate of fuel and the means for controlling a flow rate of combustion whereby heat exchanging therebetween is achieved without fluctuation in temperature of fluid. Typically, the parameters are rotational speed of the motor and flow rate of fuel pumped from the fuel pump. The parameters may be those as selected from a group of atmosphere pressure, temperature of combustion air, voltage of electric current, temperature of fluid before and behind heating and required heating temperature of fluid.

Control device in continuously variable transmission system for vehicle

Abstract: In a control device in a continuously variable transmission system for a vehicle, wherein the continuously variable transmission system is provided on a power transmission route of an engine and a speed ratio thereof is controlled such that an engine rotational speed can be a target engine rotational speed, when a detected acceleration during acceleration is smaller in value than the reference acceleration or a detected deceleration during deceleration is smaller in value than the reference deceleration, the transient time target engine rotational speed is selected instead of the steady time target engine rotational speed, whereby a speed ratio of the continuously variable transmission system is made to be a small value during acceleration and deceleration.

Ball drive sprinkler

Abstract: A rotary, pop-up sprinkler is provided which includes an in-ground container. A motor is reciprocably mounted in the container and includes a stator, a plate assembly mounted on the stator and a rotor rotatably received in the stator. The rotor includes a turret with a nozzle orifice. Hydraulic pressures on the rotor are balanced whereby anti-rotational drag is substantially reduced. A speed regulator is provided for maintaining a relatively constant rotational speed when the sprinkler is subjected to variances in hydraulic pressure.

Plasticating control apparatus for injection machine

Abstract: A plasticating control apparatus for an in-line screw type injection machine, including: a resin pressure sensor for detecting as an electrical signal pressure of a molten material at a distal end of a heating cylinder during plastication; means for directly converting the rotational speed of an electric motor to reciprocal movement of a hydraulic piston for driving a screw; and a control circuit for receiving the electrical signal from the resin pressure sensor and supplying the control signal to the electric motor in accordance with the electrical signal, the control signal supplied from the control circuit to the electric motor being adapted to control the rotational speed of the electric motor and hence a backward speed of the screw such that the pressure of the molten material at the distal end of the heating cylinder is not a negative pressure but substantially zero kg/cm 2 .

Differential having a generally spherical differencing element

Abstract: A differential mechanism can be driven by either or both of two inputs to provide an output rotational speed that is variable and can exceed, be equal to, can be less than, and can even be opposite to the input rotational speed. The differential uses a self-centering spherical element made of a structural thermoplastic material and which engages a pair of friction rings, one connected with an input assembly and one connected with an output assembly. A loading arrangement resiliently biases the spherical element into frictional engagement with the friction rings in a manner which is independent of the orientation of the spherical element with respect to the friction rings. Control of the rotational position of the spherical element is effected by an axially actuatable rod or a centrally disposed linkage so that the output rotational speed can be controlled. Powered control of the position of the spherical element can be provided.

Disk size detecting circuit

Abstract: In a disk size detecting circuit, the size of a disk is determined according to the speed of a motor adapted to rotate the disk and the angle through which motor has rotated after the start thereof. A counter, which is reset with the signal which starts the operation of the motor, counts pulses indicative of the amount of rotation of the motor. A rotational speed detector circuit, which may take the form of a frequency-to-voltage converter followed by a voltage comparator or a frequency counter followed by a digital comparator, produces a signal indicating the rotational speed of the motor. The output of the counter and the output of the rotational speed detector are applied to a circuit which discriminates the size of the disk according to the two signals.

Vibration control device for vehicle

Abstract: PURPOSE:To effectively reduce the vibration of a vehicle body, by driving an actuator in accordance with an output waveform which is obtained in accordance with the rotational speed of an engine 1 to apply damping force to the vehicle body, and by comparing the actually measured value of vibration of the vehicle body with a desired value to compensate the output waveform. CONSTITUTION:Waveforms having the same amplitude as that of vibration predicted from the rotational speed of an engine 1 and a phase reverse to that of the vibration are previously stored in a waveform memory means 13. A waveform corresponding to an engine rotational speed obtained from an engine rotational speed detecting device 8 is taken out from the waveform memory means 13, and is issued from a waveform generating means 14. This waveform is amplified by a power amplifier device 10 and then is delivered to an actuator 6 which applies damping force to the vehicle body when it is driven. Further, a desired value for reducing vibration is previously stored in a vibration desired value memory means 12. When an actually measured value of vibration of the vehicle body obtained by a vehicle body vibration detector 5 exceeds this desired value, a stored waveform rewrite means 15 rewrites the content of the waveform memory means 13.

Method and device for operating a centrifugal pump

Abstract: A centrifugal pump for a liquid is operated in such a way that the rotational speed is controlled, dependent on a sensor for detecting cavitation phenomena, in accordance with a spike curve so as to remain below the cavitation limit. A reference signal is used for this purpose which is generated by means of an adjustable signal transmitter.

Variable speed transaxle assembly

Abstract: A transmission/transaxle assembly for vehicles such as lawn and garden tractors which includes a housing, a dual input, a constant mesh planetary gear assembly, differential gear, axle, and output gear which transfer the planetary gear output to the differential gear and axle. The assembly reduces the rotational speed of two power inputs to a single, lower speed output and allows clutchless, infinitely variable forward, neutral and reverse output speeds by varying the rotational speed of at least one of the inputs with respect to the other. The assembly is compact and provides efficient lubrication through emersion of portions of the planetary gear assembly which continuously rotate in an oil compartment. The axes of the input shafts are arranged transverse to the axis of the output axles such that the assembly will easily accommodate vertical drive shaft engines in tractors or mowers. Output gearing transfers the reduced output of the planetary gear assembly first transverse to and then parallel to the input axes. Various differential gearing may be used while variation of the speed of one of the inputs may be made with a variable pulley assembly or other variable drive assembly.

Speed changing device

Abstract: A speed changing device wherein the driver and driven pulleys can be replaced to attain a desired increase or decrease in rotational speed. The distance between the driver and driven pulleys is adjustable so that the tension of the drive belt coupling the driver and driven pulleys is also adjustable. The mounting plate upon which the motor and driver pulley are mounted can be tightened securely against the housing so that the previously set tension can be retained during the operation of the speed changing device.

Control method of preventing slip of power train

Abstract: PURPOSE:To make drive force maximum, by obtaining a slip rate in accordance with the difference between the rotational speed of drive wheel and a wheel rotational speed which is obtained from a vehicle running speed, and as well by controlling the output torque of a power train in accordance with the deviation between the thus obtained slip rate and a desired slip rate. CONSTITUTION:Rotational speeds 142 through 145 of left and right, and front and rear wheels are stored in predetermined address areas in a RAM1430 by means of an input interface circuit 1200. On the basis of these values a CPU1300 calculates the averaged rotational speed VF of the two front wheels, and as well calculates the averaged rotational speed VR of the two rear wheels. A slip rate is calculated in accordance with the thus calculated values, and discrimination is made on whether this slip rate S is a desired slip rate or not. When the slip rate S is not equal to the desired slip rate upon starting, the CPU calculates the deviation DELTAS therebetween, and also calculates the data DELTAtheta of correction amount for the throttle opening in accordance with the deviation. Further, the CPU issues, in accordance with this correction amount data DELTAtheta, an air amount control signal 220 for controlling the output torque of the engine.

Accessory drive device in engine

Abstract: A device which drives accessories such as an alternator or a cooling water pump utilizing output of an automobile engine, includes an input shaft rotating at speed corresponding to an output shaft of the engine, and a nonstage transmission installed between the shaft and a pulley connected to the accessory. The nonstage transmission is provided with a planetary cone rotating in the revolution around the input shaft and also in the self-rotation, and a shifting ring engaged in frictional engagement with the conical surface of the planetary cone and movable along the axial direction of the pulley, thereby the transmission ratio corresponding to displacement of the gear shifting ring is obtained. Variation of the position of the shifting ring is performed by action of the hydraulic piston cylinder assembly working at hydraulic pressure corresponding to the rotational speed of the pulley.

Device for the determination of rotational speed

Abstract: A device for determining the rotational speed of a rotating component, in particular of a brake disc (1) of an automotive vehicle brake, the brake disc (1) containing recesses (2) shaped at preferably regular distances and lying opposite to a probe. A contact element (5) is provided as the probe which is adapted to move into abutment on the brake disc (1) and which, when overriding each recess (2), will interrupt an electric circuit comprising an evaluation circuit.

Multistage automatic speed control device

Abstract: PURPOSE: To synchronize the speed change operations of both main and auxiliary speed change units, by providing a solenoid valve for controlling the turn-on and -off of a control valve disposed in an oil passage communicated with an associated frictionally engaging component. CONSTITUTION: A control pressure B 0 from a solenoid valve SD which is controlled in accordance with a signal from a control section E receiving a signal from a rotational speed sensor A 2 for detecting the rotational speed of a sun gear in the main speed change unit, is fed into an upper oil chamber t 2 in a release control valve 66 which thereby controls the release pressure of the O/D brake B 0 , and therefore, it is possible to synchronize an up-shift operation of the main speed change unit with a down shift operation of an auxiliary speed change unit. COPYRIGHT: (C)1987,JPO&Japio