85results about How to "Consistent frequency" patented technology

The invention relates to a ship-shaped switch fatigue test device which is used for testing a ship-shaped switch comprising two press ends. The ship-shaped switch fatigue test device comprises a working platform, a bracket, a first drive device and a second drive device, wherein the working platform is used for fixing the ship-shaped switch; the bracket is fixed on the working platform, and a press column for pressing the ship-shaped switch is arranged on the bracket; the first drive device is used for driving the press column to move up and down so as to press the ship-shaped switch; and thesecond drive device is used for driving the press column to horizontally move above the ship-shaped switch. The ship-shaped switch fatigue test device can carry out a fatigue test on a plurality of ship-shaped switches simultaneously and improves the test efficiency, the force and the frequency for pressing the ship-shaped switch each time keep consistent, and the test effect is better.

The invention discloses a multidirectional rolling type vibration absorption damper which comprises a metal inner box body and an outer box body which are installed together in a sleeving manner; the outer wall of the inner box body is connected with the inner wall of the outer box body through vertical guide rails; the bottom of the inner box body is fixedly connected with the outer box body through an elastic vibration absorption component; the inner wall of the inner box body is connected with the outer wall of a mass block through shape memory alloy energy dissipation springs; a plurality of metal balls which can roll are arranged in the inner box body and are arranged in spherical grooves of the inner box body; the mass block is arranged on the tops of the metal balls, is contacted and connected with the metal balls, can slide in the inner box body in an arbitrary direction and enables the shape memory alloy energy dissipation springs to deform, so that the mass block has the action of energy dissipation vibration absorption in the horizontal direction; and energy in the vertical direction is dissipated by sliding up and down of the inner box body, and thus the multidirectional energy dissipation vibration absorption action is exerted.

The invention discloses a single-phase ground fault positioning method and system. The method comprises the following steps of collecting fault data collected by each detection device; when fault information is complete after a small current ground fault occurs, judging whether the confidence level of a fault research and judgment result of the selected detection device meets a specific requirement, judging a single-phase ground fault section by using each fault detection device to obtain a fault section identification result of each fault detection device, determining the final fault sectionif the identification results are consistent; if the fault information of each fault detection device is incomplete or the confidence level of the fault research and judgment result does not meet thespecific requirement or the identification results of the fault section are inconsistent, a correlation coefficient method is utilized to determine the final fault section. The method and system maximize the utilization of the fault detection device in a distribution network, realizes the low-current ground fault positioning technology based on multi-source information, and overcomes the defect oflow precision of an existing fault positioning technology based on single-source information; meanwhile, data preprocessing ensures the accuracy and reliability of fault location.

The invention provides a dynamic two-dimensional code generating method, reading method, generating apparatuses and reading apparatuses. According to the technical schemes of the invention, the dynamic two-dimensional code generating method includes the following steps that: each frame of two-dimensional image generated by the dynamic two-dimensional generating apparatus carries a dynamic two-dimensional code corresponding to the display frequency information of the two-dimensional image; and the two-dimensional image is displayed according to the display frequency information of the two-dimensional image in the dynamic two-dimensional code. The dynamic two-dimensional code reading method includes the following steps that: the dynamic two-dimensional code reading apparatus reads one frame of two-dimensional image in a dynamic two-dimensional code with the reading frequency of the dynamic two-dimensional code reading apparatus itself, and performs image processing on the two-dimensional image, and decodes the two-dimensional image which has been subjected to the image processing so as to obtain display frequency information corresponding to the two-dimensional image; and all the rest unread two-dimensional code images in the dynamic two-dimensional code are read according to the display frequency information of the two-dimensional image.

The invention relates to the field of same-frequency circuits, and discloses a multi-source signal generating device and a microwave oven. The multi-source signal generating device comprises a first local frequency source, a first microwave signal generating device, a second local frequency source and a second microwave signal generating device, wherein the first local frequency source is used for providing a first reference frequency signal; the first microwave signal generating device corresponds to the first local frequency source, and is used for generating and outputting a first output frequency signal according to the first reference frequency signal; the second local frequency source is used for providing a second reference frequency signal; the second microwave signal generating device corresponds to the second local frequency source, and is used for generating and outputting a second output frequency signal according to the second reference frequency signal; and under the condition that the second microwave signal generating device receives the first output frequency signal generated by the first microwave signal generating device, the second microwave signal generating device generates a corresponding output frequency signal according to the first output frequency signal to serve as the second output frequency signal to be output. Through adoption of the scheme, absolutely the same frequency signals can be transmitted by different signal sources, and phase control can be performed.

The invention discloses a single-subsample rotating vector posture method under angular rate input condition. The method is characterized in that a single-subsample algorithm is applied to an angular-rate-based conic error compensation algorithm based on an angular-rate-based multi-subsample rotating vector algorithm and an angular-increment-based single-subsample rotating vector algorithm, a conic error compensation item is fitted by specifically utilizing the angular rates at the current moment and the former N moments, the coefficient of an optimal compensation item is obtained by solving linear system of equations, and the angular rate input can be used for finishing the posture solving and maintaining the consistency of a solving frequency and a sampling frequency when a gyroscope only provides the angular rate. The error caused by extraction of the angular increment through the angular rate is avoided, and the posture updating frequency of the system is not reduced.

The invention relates to a road roller open type vibration system with automatic frequency adjustment and single and double vibration functions. The system is characterized by comprising two parts, namely, a hydraulic loop part and an automatic control part, wherein the hydraulic loop part comprises a gear pump, a first electromagnetic valve, a safety valve, a first motor, a second motor and a second electromagnetic valve 6; and the automatic control part comprises a digital analog converter, a PID (proportion integration differentiation) controller, a first velocity sensor, a second velocity sensor and a comparator. According to the road roller open type vibration system with the automatic frequency adjustment and single and double vibration functions, the rear-wheel vibration frequency can be adjusted in real time according to changes of the front-wheel vibration frequency, so that the influence of a series connection hydraulic system on the operation comfort due to large difference of the front-wheel vibration frequency and the rear-wheel vibration frequency is effectively reduced, and the compactness and the flatness are effectively improved.

The invention provides an automatic frequency controller which comprises a frequency setting module and a frequency correcting module, wherein the frequency setting module is used for setting the frequency of a first wave source signal, and the frequency correcting module is used for correcting the frequency to the chamber resonant frequency. In this way, frequency setting and frequency correction functions are separated from each other. Under frequency separation conditions, the frequency setting module and the frequency correcting module can select sensitivity freely. Since the amplitude of signals generated in a signal generation module is low when the sensitivity of the frequency correcting module is high, the signal-to-noise ratio of the first wave source signal output by the automatic frequency controller is low. The frequency correcting module in the automatic frequency controller can select a device with low sensitivity to increase the amplitude of signals generated in the signal generation module. The signal-to-noise ratio of the first wave source signal output by the automatic frequency controller is thus increased. When the signal-to-noise ratio of the first wave source signal output is increased, the signal-to-noise ratio and sensitivity of corresponding electron paramagnetic resonance spectrometer are increased.

The invention provides a distributed power supply grid connection control method, in which voltage recovery control, frequency recovery control and phase recovery control are added into droop control, thereby realizing the stable transition of a distributed power supply from island operation to grid connection operation, and ensuring the stable and efficient grid connection of the distributed power supply. The grid connection control method can keep the voltage amplitudes, frequencies and phases on two sides of a distributed power supply grid connection switch PCC essentially consistent, furthermore realize the stable transition of the distributed power supply from island operation to grid connection operation, and guarantee the stable and efficient grid connection of the distributed power supply.

The embodiment of the invention provides a vector tracking method and a filter. A target function of position, speed and acceleration information of a receiver is established by comprehensively using pseudo code information of the tracked satellite of each tracking channel, and deep integration of the pseudo code information of the satellite of different moments and the state variable of the receiver is performed so that the carrier wave Doppler frequency shift and the pseudo code phase of each tracking channel of the receiver are maintained to be consistent with the carrier wave Doppler frequency shift and the pseudo code phase of the tracked satellite signals when the receiver is in the noisy environment.

The invention discloses an operation control method for a combined three-phase inverter. The operation control method includes steps of acquiring three-phase filter capacitive voltage and three-phase filter inductive current signals of the inverter; computing the average power of voltage values and current values of various phases to obtain the output average active power and output reactive power of the various phases and acquiring output three-phase voltage reference values via a droop controller; subtracting corresponding output phase voltages of the inverter from the output voltage reference values of the various phases to obtain voltage errors of the various phases; regulating the voltage errors of the various phases by the aid of a voltage regulator to generate modulation signals and modulating the modulation signals by the aid of a modulation module to generate switch control signals. The operation control method for the combined three-phase inverter has the advantage that the symmetry of the output three-phase voltages of the inverter can be guaranteed in off-grid operation modes of micro-grids when three-phase loads are unbalanced.

The invention discloses a mode hopping suppression method and system for an opto-electronic oscillator. The method comprises steps: a phase frequency detector compares an output signal of a low frequency reference oscillator with a signal of a double-loop structure point frequency opto-electronic oscillator through frequency division of a frequency divider, and if the frequency difference betweenthe two exceeds the maximum traction range of a phase locked loop, a frequency control loop is triggered to start working; a frequency control loop generates a control signal and sends the control signal to a voltage-controlled radio frequency phase shifter in a short loop of the double-loop structure point frequency opto-electronic oscillator, the oscillation frequency of the double-loop structure point frequency opto-electronic oscillator is tuned until the frequency difference of output signals between the low frequency reference oscillator and the frequency divider falls in the traction frequency range of the phase locked loop, the frequency control loop is triggered to stop working. Mode hopping and frequency drift suppression on the double-loop structure point frequency opto-electronic oscillator can be realized based on one frequency control loop and the phase locked loop, and long-term stability of the oscillation frequency is achieved.

The invention relates to the field of medical devices, and discloses a semi-automatic cardiopulmonary resuscitation machine. The semi-automatic cardiopulmonary resuscitation machine is simple in operation, easy to learn and use, and can be used for rescuing patients with sudden cardiac arrest. The semi-automatic cardiopulmonary resuscitation machine comprises a lifting system and a cardiopulmonaryresuscitation system, wherein the cardiopulmonary resuscitation system comprises a cover, a shell is arranged below the cover, a hole is arranged in the center of the shell, a pressing rod penetratesthrough the hole, a first up-and-down reciprocating mechanism is arranged above the pressing rod, the first upper and lower reciprocating mechanism is connected with a first shaft 1, the first shaftis arranged on the shell and is located at one side of the pressing rod, and the first shaft is connected with a motor through a first transmission mechanism, the first shaft is connected with a second shaft through a second transmission mechanism, the second shaft is connected with a pressing plate through the upper and lower reciprocating mechanism second, a breathing air bag fixed in the shellis arranged right side below the pressing plate, the breathing air bag is connected with one end of a tube, and the other end of the tube is connected with mask; the lifting system comprises a lifting device and a protective shell, wherein the lifting device is positioned in the protective shell; the upper part of the lifting device is connected with the lower part of the shell; the lower part ofthe lifting device is connected with the plate.

The invention relates to an electrochemical mask which comprises a middle filter layer and an outer surface layer positioned outside the middle filter layer. The electrochemical mask further comprisesan electrochemical membrane electrode layer positioned on the inner side of the middle filter layer. The electrochemical membrane electrode layer comprises a moisture absorption inner surface layer,a cathode hydrogen evolution layer arranged on the outer side face of the moisture absorption inner surface layer and an anode oxygen evolution layer arranged on the inner side face of the moisture absorption inner surface layer, and the cathode hydrogen evolution layer and the anode oxygen evolution layer are connected with a power source arranged on the mask through wires respectively. Moisturein breathing steam is absorbed through the mask moisture absorption inner surface layer, an ion channel between the cathode hydrogen evolution layer and the anode oxygen evolution layer is communicated, water in the breathing steam is electrolyzed into oxygen and hydrogen, and the problem that the mask loses efficacy due to breathing steam in the mask wearing process is solved; meanwhile, oxygen is supplied back to the human body, and oxygen is increased for a mask wearer; and a conventional mask preparation process is not changed, the process is simple, the preparation cost is low, and the mask is a special functional mask.

The invention relates to an MEMS (micro-electromechanical system) resonator with an LC series resonance circuit and belongs to the technical field of electronic science. The resonator comprises a vibration block and supporting anchors thereof, input/output electrodes, an input-end LC series resonance structure and input/output ends. Each input end is connected with one input electrode through an inductor, and the supporting anchors of the resonance block form capacitor structures in the LC series resonance circuit. The MEMS resonator with the LC series resonance circuit has the advantages that the LC series resonance circuit composed of the inductors and capacitors is added in front of the input electrodes of a conventional electrostatic drive capacitive MEMS resonator, and the series resonance frequency is identical to mechanical resonance frequency of the vibration block; by introduction of the structure, actual input voltage and energy conversion efficiency of the resonator are improved, the resonator is enabled to excite larger displacement by vibration, further output amplitude is heightened, and output performance of is resonator is improved effectively.

The embodiment of the invention provides a circuit for electrical isolation and clock synchronization and a multi-channel signal generation device. The circuit comprises a clock source and a balance-unbalance converter, wherein the clock source is used for generating clock signals; the balance-unbalance converter is used for distributing the clock signals to a plurality of output paths, so that the frequency, the phase and the phase noise of clock signals obtained by the output paths are consistent with those of the clock signals produced by the clock source respectively; and the output paths are electrically isolated. The embodiment of the invention realizes the effect that the frequency, the phase and the phase noise of each output path are completely consistent under the condition that the output paths are mutually, completely and electrically isolated.

The invention relates to a method for synchronizing the frequency of a plurality of ultrasonic transducers and an ultrasonic vibration box applying the same. The ultrasonic vibration box comprises a stainless steel plate, the plurality of ultrasonic transducers, and frequency collaborative boards, wherein the ultrasonic transducers are arranged on the stainless steel plate and are used for outputting ultrasonic waves, the frequency collaborative boards are arranged on the plurality of ultrasonic transducers, and are used for enabling the frequency of the plurality of ultrasonic transducers tobe consistent with one another. By adopting the design, under the action of the collaborative boards, the frequency of the ultrasonic transducers are basically consistent, the energy loss caused by different frequencies between one another is greatly reduced, the mechanical conversion rate is improved, and meanwhile the noise is greatly reduced.

The invention discloses a vibration motor. The vibration motor comprises a housing, and further comprises a gear switch used for controlling the frequency of an alternating-current power supply, and an elastic insertion piece, wherein an output shaft is rotationally arranged in the housing; two opposite coils are arranged on a side wall of the housing; an armature part in response to the coils is fixedly arranged on the output shaft; a slot is formed in the bottom of the output shaft; an insertion slot allowing the elastic insertion piece to insert is formed in a bottom end of the slot; a drive mechanism pushing the elastic insertion piece is arranged at one end of the elastic insertion piece. Compared with the prior art, the slot allowing the elastic insertion piece to insert is formed in the bottom of the output shaft and the drive mechanism pushing a spring leaf is arranged, so that when the gear switch performs switching among gears at different vibration frequencies, the spring leaf is inserted into the slot of the output shaft through the drive mechanism to change an elastic deformation coefficient of the spring leaf, and the coil output frequency can be guaranteed to be the same as the frequency of the output shaft of the vibration motor when a maintenance tool is switched among the gears at different frequencies.

The utility model discloses a trace gas concentration detection device, solves the problem that the existing trace gas concentration signal extraction is not accurate enough, and belongs to the field of weak signal detection. According to the invention, an arbitrary waveform generation module is constructed by using an FPGA internal digital circuit, and reference signals required by a digital signal processing module and driving signals required by a laser driving source are generated by the arbitrary waveform generation module. The frequency of an input signal which is sent into the digital signal processing module and contains trace gas information is ensured to be consistent with the frequency of a reference signal to the greatest extent, and accurate gas concentration information is obtained. A dual-channel phase frequency lock-in amplifier constructed by a digital signal processing module in an FPGA is used for respectively squaring two paths of difference frequency signals with phase information generated by dual channels through a multiplier, the two paths of signals are added, and amplitude information with a phase error of 0 is obtained through root extraction; and the influence caused by the phase error of the detected signal and the reference signal is avoided.

The invention discloses an inverter power driving circuit for a railway phase-sensitive track circuit. The inverter power driving circuit includes a serial port display module, a CPU and communicationserial port module, a current amplification circuit and a protection circuit; the CPU and communication serial port module includes a single chip microcomputer, a serial port isolation communicationcircuit and a CPU power off reset circuit, the single chip microcomputer is internally provided with an SPWM wave generator used for generating two ways of SPWM waves, the serial port isolation communication circuit is used for completing communication isolation between the CPU and communication serial port module and the serial port display module, and the current amplification circuit is used for amplifying an SPWM wave current to drive an inverter motherboard to generate a track power source or a local power source. The inverter power driving circuit is high in reliability, and low in system volume weight, power source output is pure sine waves, noise and electromagnetic interference can be reduced, an output power source can stabilize the voltage, the amplitude and the phase differencecan be adjusted, a railway field failure can be truly simulated, situations such as undervoltage, overvoltage and non-ideal phase difference of the field voltage are simulated, and the needs of experimental training teaching in railway higher vocational colleges are met.

The invention provides a two-out-of-two safe input signal acquisition method and system, and the method comprises the steps: a first logic unit and a second logic unit perform self-inspection before signal acquisition, then the first logic unit and the second logic unit judge whether hardware of a first acquisition circuit and a second acquisition circuit has faults or not according to the self-inspection result, if the hardware has faults, a safety report is guided to be wrong, and if the hardware has faults, the first acquisition circuit and the second acquisition circuit have faults. If no fault exists, the output unit outputs an input signal, the protection circuit I and the protection circuit II respectively receive the input signal, then the acquisition circuit I acquires the input signal from the protection circuit I, and the acquisition circuit II acquires the input signal from the protection circuit II. According to the invention, input hardware circuit faults can be detected by using a self-checking function; a two-out-of-two safety input system is used, so that the safety of a safety input circuit system is improved; the anti-interference capability can be improved by using multi-frequency pulse excitation dynamic acquisition; and hardware circuit faults can be detected in real time by using encodable pulse excitation, so that timeliness is guaranteed, and readability is improved.

The invention discloses a self-adaptive shaking special seat for preventing a needle from falling off for pediatric infusion. The self-adaptive shaking special seat comprises a seat plate, arc-shaped strip rods, an infusion chair, an anti-falling fixing rod, safety armrests and a standby arm-chair, wherein two groups of sliding grooves are formed in the top of the seat plate; two groups of sliding blocks are arranged in the sliding grooves in a sliding manner; two groups of arc-shaped strip rods are arranged on the surface of the top of the seat plate; two groups of connecting rods are arranged on the tops of the arc-shaped strip rods; the infusion chair is arranged on the tops of the connecting rods; a U-shaped sliding frame is arranged on the surface of the infusion chair through a hole in a sliding manner; a support frame is arranged on the top of the U-shaped sliding frame; the anti-falling fixing rod is arranged on the top of the U-shaped sliding frame; and the arc-shaped safety armrests are arranged on the surfaces of two sides of the front side of the infusion chair. According to the self-adaptive shaking special seat disclosed by the invention, due to the arrangement of the anti-falling fixing rod and the arc-shaped strip rods, the device can drive the whole device to shake synchronously when the infusion chair shakes, so that the relative stability of the infusion bottle is further maintained so as to reduce the shaking effect, and the needle falling phenomenon is avoided.

The invention provides a boundary stiffness simulation system in a full-motion vertical fin buffeting test of an airplane strength test, and belongs to the technical field of airplane testing. Comprising a mounting bottom plate connected with the ground through foundation bolts, a boundary dynamic stiffness simulation assembly arranged on the mounting bottom plate and a rotation dynamic stiffness simulation assembly arranged on the mounting bottom plate, and the boundary dynamic stiffness simulation assembly and the rotation dynamic stiffness simulation assembly are connected with an aircraft vertical fin; the bending support dynamic stiffness of the full-dynamic vertical fin structure in a real state is simulated through the boundary dynamic stiffness simulation assembly, and the corresponding box section thickness can be designed according to the modal frequencies of the first bend and the second bend of the vertical fin; the rotary supporting dynamic stiffness of the full-motion vertical fin is simulated through the rotary dynamic stiffness simulation assembly, and different elastic element thicknesses can be designed according to the first-torsion modal frequency and the second-torsion modal frequency of the full-motion vertical fin, so that it is effectively guaranteed that the main modal frequency of the vertical fin structure in the ground installation state is consistent with the main modal frequency of the vertical fin structure in the real flight state; and the accuracy of a full-motion vertical fin buffeting test result in an airplane strength test is improved.