62 results about "Rotational frequency" patented technology

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.

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.

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 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.

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.

This invention relates to the field of massage device technology, and more particularly to a self-adjusting massage device, comprising: a main body; a power module connected to the main body for providing massage pressure; a massage module connected to both the main body and the power module, which simulates massage movements by applying pressure and rotational force to the skin; a detection module for measuring the skin indentation depth, actual skin temperature, maximum volume of the massage head, and airflow velocity at the pressing position; and a control module for adjusting the volume of inflated gas according to the skin indentation depth, or adjusting the motor torque according to the actual skin temperature, or initially adjusting the standard rotation frequency according to the maximum volume of the massage head, and then further adjusting the standard rotation frequency according to the airflow velocity at the pressing position. This invention improves the accuracy of the massage device.

The utility model provides a scanning module and a laser radar. The scanning module is applied to the laser radar comprising a transmitting optical system and a receiving optical system. The scanning module comprises a deflection element used for receiving the laser beam emitted by the emission optical system and deflecting the laser beam to a measured object in a pitching direction; the motor is used for supporting and driving the deflection element to rotate in the azimuth direction and deflecting the laser beam to a measured object in the azimuth direction; the deflection element is also used for receiving laser echoes reflected by the measured object and deflecting the laser echoes to the receiving optical system; and the scanning control panel is electrically connected with the deflection element and / or the motor and is used for controlling the pitching deflection angle of the deflection element and / or controlling the deflection frequency of the deflection element and the rotation frequency of the motor. While the view field range of the laser radar in the horizontal direction is improved, the complexity and the light adjustment difficulty are reduced, and different scanning modes are adaptively switched according to the use scene.

A compressed air supply system of an aircraft includes: a bleed air passage through which bleed air from a gas turbine engine flows; an auxiliary compressor including a compressor inlet and a compressor outlet, the compressor inlet being fluidly connected to the bleed air passage; a supply passage which is fluidly connected to the compressor outlet and through which compressed air from the auxiliary compressor is supplied to an air system of the aircraft; a driver that rotates the auxiliary compressor; a sensor that detects pressure or temperature of the supply passage; and circuitry that controls an output rotational frequency of the driver in accordance with a detection signal of the sensor.

The present application relates to the field of gear fault diagnosis, and discloses a kind of gearbox fault automatic diagnosis method, comprising the following steps: the rotational frequency of gear shaft and the meshing frequency of gear box meshing pair are calculated;The vibration signal of each type of gear box system is signal-processed, and the frequency spectrum of the vibration signal is obtained;The frequency spectrum of the vibration signal includes the meshing frequency and the side frequency;The side frequency of the first-order rotational frequency on the left and right sides of the meshing frequency, and the side frequency of the second-order rotational frequency on the left and right sides of the meshing frequency are taken as the fault characteristic frequency, the fault characteristic frequency is identified respectively using the constructed fault characteristic frequency identification method, whether there is a fault component at the fault characteristic frequency is determined, and the correspondence between the fault characteristic frequency and the fault type is obtained;An automatic diagnosis model is constructed, the vibration signals of each type of gear box system actually measured are analyzed, and a fault diagnosis result is made.The problem that the prior art lacks convenient and automatic diagnosis technology for complex and variable working conditions is solved.

The invention discloses an unmanned aerial vehicle countering autonomous tracking system based on visual detection, relates to the technical field of unmanned aerial vehicle countering, and constructs a unique rotor visual fingerprint of each unmanned aerial vehicle by capturing rotor micro-motion visual features such as rotation frequency, blade swing amplitude, rotor blade reflective features and blade edge micro-deformation of the rotor of the unmanned aerial vehicle. The feature processing module performs normalization and dimensionality reduction processing on extracted features, effectively unifies different feature dimensions and eliminates redundant information, and the autonomous tracking module uses rotor visual fingerprints as core matching features and adopts a cosine similarity algorithm and a linear pre-judgment formula to realize accurate target identification. Precise identification and continuous and stable tracking of an unmanned aerial vehicle target are realized, the dual verification module combines basic features of an unmanned aerial vehicle body, and the reliability of a tracking result is further enhanced by presetting a matching threshold value and calculating a comprehensive matching degree through weighting.

This invention discloses a method, system, and storage medium for extracting the rotational speed of rotating equipment units based on the Internet of Things (IoT). The method includes: acquiring vibration acceleration signals from motor measuring points and calculating the corresponding vibration velocity signals; performing Fast Fourier Transform (FFT) processing on the vibration acceleration and velocity signals; finding the frequency with the largest amplitude in the frequency domain and verifying its accuracy, using this frequency as the extracted rotational frequency of the motor, dynamically adjusting the frequency center position and step size during the search process; calculating the extracted rotational speed of the motor based on the correspondence between rotational speed and rotational frequency; obtaining the transmission ratio of each rotating device within the unit based on the unit structure; and calculating the extracted rotational speed of each device in the unit using the extracted rotational speed and transmission ratio of the motor. This invention improves the anti-interference capability and accuracy of rotational speed extraction, and can be used for fault diagnosis, remaining life calculation, and maintenance recommendations for rotating units, reducing the false positive rate.

A method of determining a condition of an electric submersible pump (ESP) includes gathering acceleration data from a first accelerometer and a second accelerometer. The first accelerometer and the second accelerometer are affixed to the ESP. The first accelerometer is oriented orthogonally with respect to the second accelerometer. The method further includes obtaining orbit data from the acceleration data, determining a magnitude and / or phase angle of a harmonic of a rotational frequency of a motor of the ESP based on the orbit data, and determining a condition of the ESP based on the magnitude and / or phase angle of the harmonic.

The application discloses a double-rotation compound motion rack test machine, which comprises a base, a main rotation motion part, a secondary rotation motion part and a brake pipe mounting part; the main rotation motion part comprises a speed reducer motor, a rotating disc, a connecting plate, a swing arm plate and a driven rotating disc, the speed reducer motor is connected with the rotating disc, and the rotating disc and the driven rotating disc are connected with the swing arm plate through the connecting plate respectively; the secondary rotation motion part comprises a servo motor, a motor fixing plate and a universal joint, and the universal joint is tightly connected with the rotating shaft of the servo motor; the brake pipe mounting part comprises a connecting rod, a brake pipe support fixing block, a brake pipe, a brake pipe joint fixing plate, a hollow steel pipe, a fisheye bearing, a bearing fixing block and an aluminum profile, the connecting rod is connected with the universal joint and the hollow steel pipe respectively, and the hollow steel pipe is movably connected with the fisheye bearing; and the application can adjust the angle, the rotation frequency and the running number, and can realize the compound motion of two kinds of rotation motions, so as to meet the brake pipe rack test demand.

An assembly for a gas turbine engine according to an example of the present disclosure may include at least one rotatable airfoil, at least one vibration sensor operable to detect vibration of the at least one airfoil at one or more rotational frequencies, and a controller operatively coupled to the at least one vibration sensor. The controller may be operable to determine an accretion level associated with accretion of glass on the at least one airfoil in response to comparing vibration of the at least one airfoil at the one or more rotational frequencies to a vibratory pattern associated with accretion of glass. A method of operation is also disclosed.

The application provides a width expansion projection device and a projection system. The width expansion projection device comprises: a projection assembly for projecting continuous cutting pictures; a rotating assembly arranged on the side of the projection assembly, and the rotating frequency of the rotating assembly is greater than or equal to 24 Hz; and a refracting assembly arranged on the rotating assembly and matched with the projection end of the projection assembly, the refracting assembly refracts the picture projected by the projection end. The width expansion projection device provided by the application drives the refracting assembly to rotate around the projection assembly through the rotating assembly, the rotating assembly provides support and fixation for the refracting assembly and rotates around the projection assembly at a frequency greater than or equal to 24 Hz, the refracting assembly refracts the projected picture when rotating through the projection end of the projection assembly and forms an entirety with the original projected picture of the projection assembly, the expansion of the width direction of the projected picture is realized based on the human eye visual residual principle, there is no color difference problem, and the width expansion projection device can be realized, the structure is simple, and the cost is low.

The application discloses a motor heating method and device, a motor controller, an electric vehicle and a storage medium, relates to the technical field of electric vehicles, and is applied to the motor controller. The method comprises the following steps: obtaining a motor heating instruction; obtaining a target high-frequency rotating current vector according to the motor heating instruction, wherein the target high-frequency rotating current vector comprises a target current amplitude and a target rotating frequency; and controlling the motor to work in a step-out operation mode according to the target high-frequency rotating current vector, so as to generate motor loss, wherein the motor loss comprises copper loss and iron loss. The application solves the problem that the motor heating in the prior art is not balanced among three-phase windings, and influences the performance of the motor, and achieves the effect of improving the efficiency of heating the power battery through motor heating in the electric vehicle.

This invention relates to a method for measuring the rotational speed of a fully enclosed compressor using a multi-signal processing technique, comprising the following steps: establishing a current signal speed measurement model; acquiring the current signal, which originates from the current signal of the fully enclosed compressor; preprocessing the current signal, which involves first removing the DC component of the signal, then passing it through a third-order low-pass Butterworth filter, followed by extracting the rotational speed signal using a HILBERT transform; setting a refined frequency band interval, then performing wavelet transform for spectral refinement, and then performing spectral correction using a ratio correction method; then using a Kalman filter to optimally estimate the rotational frequency of the fully enclosed compressor after correction, in order to smooth the rotational frequency of the fully enclosed compressor, and finally obtaining the rotational speed value and displaying it on a host computer; using the above method, the problems of low measurement accuracy and high computational resource consumption of fully enclosed compressor rotational speed can be solved, thereby improving measurement accuracy and computational speed.

A control apparatus, which controls a drive motor that drives a rotor installed in an electrical aircraft, instructs the drive motor to selectively operate in at least two motor-control modes. The at least two motor-control modes include a flying motor-control mode for causing the electrical aircraft to fly, and a cleaning motor-control mode for cleaning the rotor. The control apparatus controls, in the cleaning motor-control mode, the drive motor such that a rotational frequency of the drive motor is lower than a predetermined human-audible frequency range.

In the diagnosis device of the electric motor of the present application, a threshold value calculation section (123) calculates a threshold value for abnormality determination of the electric motor (5) based on the operation result of the rotation frequency σ value operation section (122), a normal state storage section (124) stores the operation result of the averaging operation section (121) as a normal state of the electric motor (5), a load rate calculation section (110) calculates the operation load rate of the electric motor (5), an FFT analysis result correction section (125) corrects the FFT analysis result of the FFT analysis section (112) at the time of implementing the diagnosis, an FFT result correction matrix selection section (118) selects the correction value of the FFT analysis result according to the values of the operation frequency and the operation load rate of the electric motor (5), an abnormal state comparison section (117) determines the operation state of the electric motor (5) based on the correction value of the FFT result correction matrix selection section (118) and the threshold value for abnormality determination of the electric motor (5), and if there is an abnormality, the display is performed on the display section (11).

To miniaturize backscatter type wireless communication devices. [Solution] The transmission circuit includes at least two backscatter circuits and a control circuit that controls the reflection coefficients of the backscatter circuits at different rotational frequencies.

The invention relates to a friction damper 2 for damping vibrations of a shaft, in particular a crankshaft 106 of an internal combustion engine 104. A housing 10 of the friction damper 2 can be fixedly connected to the shaft, for example via a hub 4 and / or fastening elements 6, 7. The friction damper 2 has a mass ring 14, which is formed from at least two mass segments 16 that are connected to each other via pressure elements 18. The pressure elements 18 press the mass segments 16 against an outer circumferential surface 20 of a receiving space 12 such that the mass ring 14 is rotatable relative to the receiving space 12. This generates a friction behavior that is dependent on the rotational frequency, which enables damping of the natural frequencies of the crankshaft 106.

The invention of cyclic compaction systems represents a significant advancement in the field of metal smoothing and polishing, particularly for complex geometries and irregular surfaces. This innovative approach involves assemblies, systems, and methods that utilize a cyclic compressing mechanism combined with ion transport dry electrolytes. This mechanism facilitates the compaction of free solid bodies, enhancing the electrical current across the surface being polished. Cyclic compaction systems are particularly effective for polishing challenging-shaped samples such as gears, inner channels, punches and concave surfaces as they enable precise control over the polishing process. Various configurations of these systems can be adapted to meet specific requirements, ensuring optimal results based on the unique characteristics of the workpieces involved. By adjusting parameters such as particle layer thickness, pump suction force, rotational frequencies, and electrolyte composition, the systems can achieve significant improvements in surface quality and reduction in roughness values.

An acoustic diagnostic method, system, medium, and equipment for acoustic resonance in aero-engine compressors are disclosed. The method employs a Fast Fourier Transform algorithm to perform spectral analysis on the sound pressure time-domain signal, obtaining the spectrum of the sound pressure time-domain signal for each channel. The spectrum is monitored for any single asynchronous peak other than the blade passage frequency and rotational frequency. The acoustic mode spectrum of the abnormal single-tone frequency peak is obtained using a single-frequency acoustic mode decomposition method. The wave spectrum of the sound pressure time-domain signal is obtained through continuous broadband acoustic mode decomposition. The presence of compressor acoustic resonance characteristics in the wave spectrum is monitored to determine if the compressor is experiencing acoustic resonance. When compressor acoustic resonance occurs, the main components in the spectrum, besides the blade passage frequency and rotational frequency, consist only of a single asynchronous peak, and in the wavenumber domain, only a single dominant acoustic mode exists at this peak frequency.

The application discloses a kind of rotor dynamic balance test system based on magnetic suspension bearing, including the drive motor of connecting the rotor to be measured, the inductive copper sleeve being arranged in the shaft extension end of the rotor to be measured and the two magnetic suspension bearings as rotor supporting unit, still including drive motor frequency converter, magnetic suspension bearing controller, rotational speed sensor and multiple eddy current displacement sensors;Its test method is also disclosed, drive magnetic suspension bearing controller controls the suspension and drop of magnetic suspension bearing, sends rotational frequency instruction to motor frequency converter to drive rotor rotation, the radial amplitude of rotor is collected and saved by data acquisition instrument in the process of rotor rotation, according to rigid rotor dynamic balance calculation model, the size and phase of correction mass are analyzed and calculated to vibration data.The application can directly complete the calculation of the dynamic balance precision of rotor by the industrial computer of control system, and the reverse suppression current applied to the rotor by the magnetic suspension bearing can reduce the vibration amplitude of the rotor, so that the rotor system is more stable.