174 results about "Rotational frequency" patented technology

A friction stir spot welder includes: a pin; a shoulder; a rotary driver; a tool driver; and circuitry that performs an operation of driving the rotary driver and the tool driver such that the pin and the shoulder press a workpiece by a first pressing force while rotating at a first rotational frequency, and after the operation, performs an operation of driving the rotary driver and the tool driver such that a tip of the shoulder in a rotating state is pressed in to a first position. The first position is a position corresponding to 46% or more of a thickness of the workpiece from a front surface of the workpiece. A press-in speed of the shoulder until the shoulder reaches the first position is a constant speed.

The invention discloses an AC excitation system self-starting control method and system, and the method comprises the steps: obtaining a rotor current rotation frequency and an actual rotor rotation frequency, and generating a slip frequency; the slip frequency is compared with a preset dynamic threshold value, and the rotating speed given value is dynamically adjusted; inquiring a preset multi-stage sectional type current control curve according to the actual rotor rotation frequency, and outputting a d-axis current given value; pI adjustment is carried out based on the slip frequency to generate a q-axis current given value, and corresponding preset current threshold limit is applied according to the frequency band where the actual rotor rotation frequency is located; performing independent parameter configuration on the magnetic flux current control loop and the torque current control loop by adopting a non-coupling parameter setting algorithm; and in the unit starting process, under the condition that the stable starting constraint condition is met, an optimal starting parameter combination is generated. According to the invention, by dynamically adjusting the rotating speed given value and controlling the current in a segmented manner, the stable self-starting of the alternating current excitation system is realized, and the reliability and efficiency of the starting process are improved.

Provided are a signal processing device, a diagnostic system, and a signal processing method with which it is possible to improve the accuracy of a determination value for determining a lubrication state in a rolling device. A signal processing device (3), which calculates a determination value for determining a lubrication state in a rolling device on the basis of a measurement signal acquired by a sensor (2), is provided with: a first processing unit (321) which converts the measurement signal into a time-domain signal by performing band limitation and envelope processing on the measurement signal; a second processing unit (322) that converts the time-domain signal into a first frequency-domain signal; a third processing unit (323) that converts the logarithmic spectrum of the first frequency domain signal into a first inverse frequency domain signal; a fourth processing unit (324) that generates a second inverted-frequency-domain signal in which the high-order cepstrum domain, which includes the rotation frequency of the scrolling device, of the first inverted-frequency-domain signal is set to a prescribed value; a fifth processing unit (325) that converts the second inverted frequency domain signal into a second frequency domain signal; and a determination value calculation processing unit (33) that calculates a determination value on the basis of the second frequency domain signal.

The invention discloses a bearing fault acoustic detection method and system based on fractional harmonic phase-locked amplification, and the method comprises the steps: obtaining an acoustic signal of a target motor, measuring the shaft rotation frequency of a motor shaft in real time, synchronizing the shaft rotation frequency to a fractional phase-locked loop, and carrying out the calculation of a bearing fault characteristic frequency according to the geometric parameters of a bearing, the bearing fault characteristic frequency is a non-integer multiple of the shaft rotation frequency, generating a reference signal synchronous with the bearing fault characteristic frequency through a fractional phase-locked loop, and performing phase sensitive detection on the obtained acoustic signal and the generated reference signal by using a phase-locked amplifier, specifically, performing orthogonal demodulation on the acoustic signal and the reference signal, and performing phase sensitive detection on the obtained acoustic signal and the reference signal. The method comprises the following steps: generating an in-phase component and an orthogonal component, extracting a direct-current component through low-pass filtering, calculating to obtain a vibration amplitude and phase information corresponding to a bearing fault characteristic frequency, and judging the type and severity of a bearing fault according to the comparison between the vibration amplitude and a preset baseline, the harmonic consistency and the phase stability.

Embodiments of the invention provide a door opener for an electrical appliance of household equipment. The door opener comprises an electric motor and a pusher drivable by means of the electric motor for pressing co-operation with the door of the electrical appliance. A power transmission mechanism is provided between the electric motor and the pusher, which is capable of ensuring a variable effective velocity of the pusher at the same rotational frequency of the electric motor. Certain embodiments provide for a multi-stage rack and pinion gear for this purpose, which is formed by a gear rim and a toothed rack, which can transmit the driving force of the electric motor to the pusher via various gear pairings that can be brought alternately into meshing engagement with one another.

The invention belongs to the field of aero-engine test and fault diagnosis, relates to an engine rotating part fault positioning technology, and provides a rotating part fault feature recognition method and system in a tachometer-free scene, and the method comprises the steps: obtaining a vibration signal and a theoretical fault feature order of a rotating part; obtaining an instantaneous rotating frequency signal of the rotating part through the constructed non-convex linear transformation regular term sparse representation model; carrying out iterative solution through the constructed sparse representation model to obtain a fault characteristic signal of the rotating part; obtaining an order envelope spectrum according to the instantaneous frequency conversion signal and the fault characteristic signal; and performing health assessment and fault identification on the rotating part according to the order envelope spectrum and the theoretical fault feature order. The method can solve the problem that the variable-speed fault of the rotating shaft part of the aero-engine cannot be recognized in a non-rotating-speed scene. Through the implementation of the method, the fault of the rotating shaft part of the aero-engine is effectively identified, and technical support is provided for troubleshooting in an aero-engine test.

The invention relates to a finishing method for finish machining of a workpiece having at least one raceway for rolling elements that extends around a workpiece axis, the method comprising the following steps: providing a finishing tool which has an abrasive working surface; applying the finishing tool to a workpiece holder, generating spinning of the workpiece about a raceway axis at a rotational frequency; generating an oscillating movement of the tool holder, which is superimposed on the spinning of the workpiece and oscillates at an oscillating frequency; and pressing the finishing tool onto the workpiece surface in a pressing direction with a pressing force so that the abrasive working surface acts on the workpiece in the region of the raceway. The finishing method is characterised by continuous detection of a force signal, which is caused by the pressing force, within a detection time period which partly or completely overlaps a machining time period of the finish machining, and by time-resolved evaluation of the force signal in order to determine at least one geometry parameter which represents (i) a workpiece geometry in the region of the machined raceway and / or (ii) a geometric relationship between the workpiece geometry in the region of the machined raceway and a position of an oscillating apparatus.

A bearingless motor (110) includes a rotor (111) disposed on a rotating shaft (101), and a stator (112) having a shaft support winding (113) and a motor winding (115). The first inverter (114) supplies power to the shaft support winding (113) and generates a shaft support force that supports the rotating shaft (101) in a non-contact manner. The second inverter (116) supplies power to the motor winding (115), thereby generating a rotational torque on the rotating shaft (101). The control unit (200) causes one or both of the first inverter (114) and the second inverter (116) to output a voltage or a current in which a harmonic wave obtained by multiplying the rotational frequency of the bearingless motor (110) by a natural number of 2 or more is superimposed so as to reduce fluctuations in the shaft supporting force.

A lawn mower includes: a cutting blade motor that drives a cutting blade; a mode selector that selects one of modes including a normal lawn mowing mode and a grass removal mode in which grass accumulated at the cutting blade is brushed away; and processing circuitry configured to control the cutting blade motor in the mode selected by the mode selector. In the normal lawn mowing mode, the cutting blade motor is controlled so as to rotate in a normal rotation direction at a predetermined rotational frequency or with a predetermined torque. In the grass removal mode, the cutting blade motor is controlled such that the rotational frequency or torque of the cutting blade motor changes more significantly than the rotational frequency or torque of the cutting blade motor in the normal lawn mowing mode, or the cutting blade motor rotates in a reverse rotation direction.

The invention belongs to the technical field of organic chemical synthesis, and particularly relates to a novel method for synthesizing trifluoromethyl heteroaromatic hydrocarbon. The invention provides a novel method for synthesizing a trifluoromethyl heteroaromatic compound, the reaction system is mild, the substrate application range is wide, and the functional group compatibility is good. Specifically, in a rotating magnetic field, a metal conductor cuts magnetic induction lines to generate electron transfer, so that trifluoromethyl sulfosalt is reduced to generate trifluoromethyl free radicals, and the trifluoromethyl free radicals react with heteroaromatic hydrocarbon to synthesize trifluoromethyl heteroaromatic hydrocarbon. The method for synthesizing the trifluoromethyl heteroaromatic hydrocarbon comprises the following steps that firstly, heteroaromatic hydrocarbon, trifluoromethyl sulfosalt, a solvent and a metal rod are placed in a reaction tube and react in a multi-energy field coupling device, the magnetic field intensity (B) is set to be 0.01-3.00 T, the rotation frequency is set to be 5-50 Hz, the reaction time is set to be 1-24 h, finally, the trifluoromethyl heteroaromatic hydrocarbon is prepared, and the general formula of the trifluoromethyl heteroaromatic hydrocarbon is shown in the specification.

A method for determining a tread remainder on a tire is provided in which first speed data and second speed data of a vehicle are obtained, the second speed data being derived in part from a measurement of a rotational frequency of the tire. The first velocity data is filtered to obtain extracted filtered first velocity data that exceeds a first predefined velocity limit, and the second velocity data is filtered such that filtered second velocity data that exceeds a second predefined velocity limit is extracted. A ratio is calculated using the filtered first velocity data and the filtered second velocity data. Further, the method includes comparing the ratio to a tire model correlating the ratio to a tread remainder in order to determine the tread remainder on the tire.

A diagnostic apparatus, for diagnosing a state of equipment including a rotating component that rotates by force transmitted from a rotating shaft, includes: a vibration information acquisition section for acquiring vibration information including waveform information of vibration of the rotating component; an analysis section for decomposing a vibration waveform into frequency components and outputting values of vibration levels for each frequency component; and a determination section for determining a presence or absence of an abnormality in at least one of the rotating shaft and the rotating component. For a range from a first frequency, which is smaller than a rotation frequency of the rotating shaft, to the rotation frequency, the determination section compares, for each frequency component, a value of a vibration level with a normal value thereof, and determine a presence or absence of an abnormality in at least one of the rotating shaft and the rotating component.

The application provides a chip hotspot heat dissipation system based on a micro robot, which comprises a magnetic field control device for generating a uniform magnetic field; a chip is placed in the uniform magnetic field; a heat dissipation channel is arranged on the surface of the chip, and a cooling medium for conducting convective heat exchange on a hotspot is circulated in the heat dissipation channel; a robot is made of a magnetic material and is placed in the cooling medium; and a processor is used for controlling the magnetic field control device to generate a magnetic field at a first target rotating frequency, so as to drive the robot to run in the cooling medium to a region where the hotspot of the chip is located; and the processor is also used for controlling the magnetic field control device to generate a magnetic field at a second target rotating frequency, so as to drive the robot to rotate in place in the region where the hotspot of the chip is located, so as to dissipate heat of the hotspot of the chip. The system provided by the application effectively solves the problem that the prior art is difficult to accurately match the dynamic migration characteristics of the hotspot; and the heat dissipation efficiency of the hotspot of the chip is improved.

The invention belongs to the technical field of inertial sensor testing, and particularly discloses a method and a device for testing dynamic response to an inertial sensor based on a rotary mass source, the device comprises a mounting platform, a rotary table and a signal processing module, two same mass sources are fixed on the rotary table, and the two mass sources are symmetrically arranged relative to the center of the rotary table; the mounting platform is used for bearing an inertial sensor to be detected and rotating according to a specific rotating frequency to generate a universal gravitation acceleration signal which changes periodically, and the frequency is two times of the rotating frequency of the turntable; and the signal processing module is used for acquiring a dynamic response test result of the inertial sensor to be tested based on the actually measured acceleration signal and the theoretical acceleration signal. According to the method and the device, the dynamic response of the inertial sensor can be accurately tested for the high-precision inertial sensor with the resolution reaching the ng magnitude level.

The invention provides a method and device for determining hydraulic damping of an underwater rotating disc, and relates to the technical field of hydrodynamics, the method comprises the following steps: obtaining a vertical displacement vibration signal of the rotating disc in a composite mode through vibration mode measurement; performing iterative filtering on the vertical displacement vibration signal to obtain a target signal of the rotating disc in a pitch circle mode; fitting a vibration response function of the rotating disc based on the target signal; based on the vibration response function, establishing a frequency response function of the rotating disc; determining the inherent frequency of the rotating disc based on the frequency response function; based on the rotating frequency of the rotating disc, performing dimensionless processing on the inherent frequency to obtain the falling frequency of the rotating disc; and based on the drop frequency, performing linear fitting regression on the hydraulic damping of the rotating disc to obtain a relational expression between the hydraulic damping and the drop frequency. According to the method for determining the hydraulic damping of the underwater rotating disc, the hydraulic damping of the rotating disc is accurately measured.

The invention provides an adaptive frequency band division bearing fault diagnosis method and device based on variable iteration, and belongs to the technical field of bearing fault diagnosis, and the method comprises the steps: obtaining a vibration signal and a rotation frequency of a bearing fault, and determining an energy spectrum corresponding to the vibration signal; determining a target energy spectrum band; determining an adaptive frequency iteration step length based on the frequency bandwidth of the target energy spectrum band corresponding to the maximum energy amplitude; based on the initial bandwidth, the rotation frequency and a preset frequency band demodulation hierarchy number, determining the hierarchy window length of each hierarchy demodulation window; based on the window length of each layer, performing iterative search on each frequency band demodulation layer by adopting an adaptive frequency iterative step length, and determining a harmonic significant index corresponding to each frequency band demodulation layer; determining an adaptive division frequency band based on the harmonic significance index corresponding to each frequency band demodulation level; envelope demodulation is carried out based on adaptive frequency band division, the fault type of the bearing is determined, and the bearing fault diagnosis speed and positioning precision are improved.

A coupling device (100) for measuring misalignment and rotational frequency for coupling a first shaft (210) with a second shaft (220) comprises a hub component (110) with a hub configured to connect to the first shaft (210). The coupling device (100) further comprises a transmission device (120) configured to transmit torque between the first shaft (210) and the second shaft (220) and to compensate for any misalignment between them. The coupling device (100) further comprises a connecting element (130) configured to connect the transmission device (120) to the hub component (110).The connecting element (130) includes a measuring device inside the connecting element (130), and the measuring device is configured to measure a load on the connecting element (130) when the rotational movement is transmitted between the first shaft (210) and the second shaft (220) in order to determine the offset or rotational frequency of the first shaft (210) and the second shaft (220).

The purpose of an abnormality detection device (1) according to the present disclosure is to detect an incipient turn-to-turn short. The abnormality detection device (1) is characterized by comprising: a frequency analysis unit (12) that performs frequency analysis on physical-quantity data of a rotating electrical machine (2); a mechanical-angle rotational frequency harmonic component extraction unit (13) that extracts a specific-order harmonic component of a mechanical-angle rotational frequency from among components having been subjected to the frequency analysis; and an abnormality determination unit (15) that compares the extracted specific-order harmonic component with a threshold value (I threshold) and that determines the presence or absence of a turn-to-turn short circuit in the rotating electrical machine (2).

A compressor (1) is provided with: a compressor main body (2) that sucks and compresses a gas to be compressed; heat exchangers (11, 12) that cool a cooling object while circulating the cooling object inside; a fan (14) that is driven by a fan motor (13) and blows cooling gas against the heat exchangers (11, 12) to exhaust heat therefrom; a temperature sensor (21) that detects a temperature of the cooling gas, i.e., a cooling gas initial temperature, which has not yet been subjected to heat exhaust by the heat exchangers (11, 12); and a control unit (5) that can set an upper limit frequency as an upper limit of a rotation frequency of the fan motor (13). The control unit (5) sets the upper limit frequency so that, at each cooling gas initial temperature detected by the temperature sensor (21), the upper limit frequency is a rotation frequency at which a current supplied to the fan motor (13) becomes a permissible current value or less.

An air conditioner according to an embodiment of the present invention includes: a refrigerant circuit including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a pressure reducer that is disposed between the outdoor heat exchanger and the indoor heat exchanger; an outdoor fan that blows the air to the outdoor heat exchanger; an indoor fan that blows the air to the indoor heat exchanger; and a control device that sets an upper limit value of a rotational frequency of the outdoor fan in accordance with a rotational frequency of the indoor fan.

An abnormality detection system (7) for a hydraulic rotary machine (1) according to an embodiment includes: a pressure gauge (71) that measures pressure relating to the hydraulic rotary machine (1); and a processing circuit (73). The processing circuit (73) performs frequency analysis of a pressure waveform, which is the measurement result of the pressure gauge (71), a plurality of times to create a frequency spectrum, records the pressure amplitude of a specific order component that is an integral multiple of the rotation frequency in the frequency spectrum, calculates the occurrence frequency of each value of the recorded pressure amplitude, and determines the presence or absence of an abnormality in the hydraulic rotary machine (1) on the basis of a temporal change in a frequency curve on a graph relating to the pressure amplitude and the occurrence frequency.

Control method for an electric rotary motor (MG100) for controlling an electric rotary motor (MG100) by PWM with a predetermined carrier frequency, wherein the method comprises the following: then, when an oscillation frequency in a natural oscillation of zero spatial order of the electric rotary motor (MG100) and a frequency of a frequency component of an electromagnetic excitation force that generates the natural oscillation overlap, switching a value of the carrier frequency from a first value to a second value that is different from the first value, wherein The tax procedure is characterized by the fact that the frequency of a frequency component of the electromagnetic excitation force fc ± 3f1, where the carrier frequency fc is and a rotational frequency of the electric rotary motor (MG100) is f1.

The present invention provides a method for welding coated steel sheets, preferably for welding aluminum-silicon-based metal-coated steel sheets, comprising the following steps: providing a structure with two laser beams, said laser beams acting on the molten pool to be formed, at least one laser beam rotating about a rotation axis so that said laser beams move relative to each other, said laser beams being guided along the welding axis, in order to mix the molten pool, observing a defined stirring effect in conjunction with a defined welding speed, the following conditions applying to the stirring effect: wherein f rot is the rotation frequency, v w For the welding speed, the following conditions apply: when welding the coated steel sheets, auxiliary materials, in particular welding filler wires, are used. The auxiliary materials, in particular welding filler wires, are used.

The present invention relates to a method, device, and system for suppressing rotor vibration in a magnetic bearing system, belonging to the field of magnetic bearing control technology. The method comprises: predicting a second displacement signal of the rotor at the current moment based on the current signal of the magnetic bearing winding at the current moment and the first displacement signal of the rotor at the previous moment; determining a current compensation signal based on the rotor's rotational frequency and the second displacement signal determined by the current signal of the winding at the current moment; and superimposing the current compensation signal and the original current command to obtain a target current command. The method provided by the present invention can extract the rotational frequency and rotor position without installing a position sensor inside the motor, greatly optimizing the motor's structural design and avoiding operational instability and maintenance costs caused by sensor damage. It can effectively implement a vibration suppression algorithm in magnetic bearing systems where sensors are not installed or cannot be installed, effectively suppressing rotor vibration.

The invention relates to the technical field of crystal growth, and discloses a crystal growth supporting rod design method which comprises the following steps: S1, designing geometric parameters of a supporting rod to prevent the supporting rod from vibrating when the supporting rod rotates along with a crystal growth furnace; and S2, designing the physical structure of the supporting rod, so that gas generated after the seed crystal is bonded and carbonized is discharged. According to the invention, the geometrical parameters of the supporting rod are designed, so that the modal frequency of the supporting rod is far away from the rotation frequency of the crystal growth furnace, namely the external excitation frequency, the vibration phenomenon of the supporting rod when the supporting rod rotates along with the crystal growth furnace is avoided, the stability of a solid-liquid interface is ensured, and the crystal growth quality is improved; the exhaust holes are formed in the supporting part and the boss part, so that gas generated after the seed crystal is bonded and carbonized can be exhausted in time, large stress is prevented from being generated in the crystal, the crystal is effectively prevented from being damaged, and the yield is greatly improved.

The utility model provides a paddle, a bearing part, a folding paddle, a power assembly and an unmanned aerial vehicle, the paddle can be installed on the bearing part, the bearing part can be installed on the unmanned aerial vehicle, the paddle is provided with a first locking part, the bearing part is provided with a second locking part matched with the first locking part, and the paddle is rotationally unfolded from a folding state under the action of driving force. The first locking component is locked to the second locking component, and the second locking component is closer to the blade tip position of the unfolded blade compared with the first locking component. The paddles can be mutually locked with the bearing piece after being unfolded, so that the positions of the paddles are kept stable after the paddles are rotated and unfolded, the paddles are kept locked after being unfolded and do not swing or vibrate back and forth, and the rotation stability of the folding paddle is improved; and the probability of arm breakage and unmanned aerial vehicle explosion caused when the rotation frequency of the blades is close to the instability frequency point of the arm is reduced, and then the flight safety of the unmanned aerial vehicle is improved.

The utility model relates to the technical field of TDO cooling, and discloses a TDO cooling device, which comprises a fan main motor, a motor cooling fan, a contactor, two circuit breakers and a frequency converter, the frequency converter is electrically connected with the fan main motor and used for adjusting the rotation frequency of the fan main motor, the two circuit breakers are respectively electrically connected with the fan main motor and the motor cooling fan, and the contactor is electrically connected with the fan main motor and the motor cooling fan. The circuit is protected. An original double-speed motor is replaced by the variable frequency motor, motor speed regulation control (the speed of the motor can be changed at will within the rotating speed range of the motor) is added at the same time, the temperature in equipment is in a controllable state, the working state of the thickness measuring instrument is not affected, product quality is improved, the motor cooling fan is added at the same time, and cost is reduced. The fan main motor can be cooled, so that the operation effect of the fan main motor is improved, and the service life is prolonged.

A hydraulic supply includes a motor coupled to a modulator block and having a stator and a rotor, a rotation shaft coupled to the rotor to rotate with the rotor, and a sensor assembly coupled to the rotation shaft to measure rotation frequency of the rotation shaft, wherein the sensor assembly rotates with the rotation shaft in response to a change in the angle between the rotation shaft and the rotor.

The invention relates to an ice making method, ice making equipment, an ice making device, a refrigerator and an electronic device.The ice making method comprises the steps that the temperature of the bottom of an ice box is obtained in real time; when the temperature of the bottom of the ice box is larger than a preset first temperature value, the rotating motor is controlled to drive the ice box to do reciprocating operation in the horizontal direction according to the initial rotating angle and the initial rotating frequency, so that water in the ice box is frozen from bottom to top; wherein the ice box is connected with the rotating motor; when the temperature of the bottom of the ice box is smaller than or equal to a preset first temperature value, the rotating motor is controlled to adjust the initial rotating angle and the initial rotating frequency according to a preset adjusting rule, the ice box is driven to do reciprocating operation in the horizontal direction at the adjusted rotating angle and rotating frequency, and the operating speed of the ice box is reduced; when the temperature of the bottom of the ice box is smaller than the preset minimum temperature value, the rotating motor is controlled to stop running, and ice making is finished. By means of the ice maker, the problem that bubbles cannot be discharged in the ice making process is solved.

The invention relates to the technical field of hydro-generator vibration faults, in particular to a generator air gap shape change-based magnetic-solid coupling simulation method and device, and the method comprises the steps: constructing a three-dimensional multi-body dynamics geometric model comprising stator and rotor eccentricity and stator and rotor deformation characteristics; generating a corresponding two-dimensional electromagnetic field geometric model; constructing an electromagnetic field physical model, and calculating a two-dimensional air gap electromagnetic force acting on the surface of the tooth part of the stator core; generalized stretching mapping is carried out on the two-dimensional air gap electromagnetic force, the two-dimensional air gap electromagnetic force is applied to a three-dimensional stator core tooth surface, and a multi-body dynamic physical model is constructed; establishing a bidirectional coupling relationship between the electromagnetic field physical model and the multi-body dynamics physical model; and carrying out coupling solution on all dependent variables in the electromagnetic field and the multi-body dynamics. Through the method and the device, the rotation frequency vibration and the frequency multiplication vibration of the rotation frequency of the generator caused by stator and rotor eccentricity and stator and rotor deformation can be restored most truly, and stator and rotor trimming can be guided most accurately.