95results about How to "Adjust frequency" patented technology

The invention discloses a novel tuning gas-liquid column damper with a damping and frequency dual regulation function and a structural vibration control system. The damper can be used for regulating damping and frequency conveniently, thereby achieving the optimal vibration / shock reduction effect on a controlled structural object in different construction phases under different intensities of loads. The novel damper has two characteristics, wherein one characteristic is that a damper valve which can regulate damping force is arranged on a horizontal section of a U-shaped pipe, and the damper valve is a magneto-rheological friction-type damper valve or an electromagnet friction-type damper valve; the other characteristic is that a gas column is further closed at vertical sections on the two sides of the U-shaped pipe, an air pressure regulation device is also installed, and the frequency of the damper is changed by means of regulating air pressure. The structural vibration control system is composed of at least one damper, at least one sensor used for measuring a structural vibration state and at least one controller, and can achieve the optimal vibration control effect on a structure in different construction phases under different use conditions and different intensities of imposed loads.

The invention relates to a road and bridge dotting device for municipal construction. The road and bridge dotting device includes a housing, a traveling wheel, a drive wheel, a transmission roller, a driven wheel, and a dotting device; the housing is of a hollow rectangular structure; a traveling hole is formed in a lower end surface of the housing; a dotting hole is formed in the lower end surface of the housing and positioned on the right side of the travelling hole; the travelling wheel includes a travelling wheel shaft, a travelling wheel body and a first gear; the drive wheel includes a drive wheel shaft, a drive wheel body, and a second gear; the transmission roller includes an inclined slide rail, a first clamping head, a primary threaded rod, a primary nut, a secondary nut, an a secondary threaded rod; the driven wheel includes a driven wheel shaft, a drive wheel body, and a stirring inserting rod; and the dotting device includes a dotting rotation shaft, a dotting horizontal rod, and a dotting probe. The dot distance-adjustable dotting device is easy to operate; the dotting device is pushed lightly so as to allow the travelling wheel to rotate, and a dotting operation is executed; the dotting distance can be adjusted by rotating the primary nut and the secondary nut.

The invention relates to a portable mechanical acoustic frequency vibration sampling drill which comprises a base, an upright column, an acoustic frequency vibration device, a lifting device, a flexible transmission shaft and a power output device, wherein the upright column is fixed on the base; the upper end of the acoustic frequency vibration device is fixed at one end of a steel wire rope, the lower end of the acoustic frequency vibration device is connected with a drilling tool, and the other end of the steel wire rope goes around a pulley arranged at the top end of the upright column and is connected with the lifting device; the lifting device is fixed on the upright column; the power input end of the acoustic frequency vibration device is connected with the power output device through the flexible transmission shaft. According to the portable mechanical acoustic frequency vibration sampling drill, an eccentric mechanism is driven to generate acoustic frequency vibration and excitation force through purely mechanical transmission, namely the acoustic frequency vibration device is driven by the flexible transmission shaft, the acoustic frequency vibration device generates the vibration frequency and excitation force of up to 200 Hz, and the excitation force is transferred to the drilling tool, so as to realize the acoustic frequency vibration drilling of the drilling tool.

The invention belongs to the technical field of vibration and noise reduction and particularly relates to a vibration isolator. The metamaterial vibration isolator comprises a metamaterial vibration isolation component and other components serving as structural components, namely an upper end cover, a limiting protective hood, a lower base plate, surface rubber coating layers, fastening bolts, a bottom implanted framework, an upper implanted framework, rubber plugs and a sealing gasket. According to the metamaterial vibration isolator, the metamaterial technology is utilized; limitation of certain apparent natural laws of traditional vibration isolation materials is broken through; the metamaterial function exceeding common intrinsic properties of original substrates is achieved, and thus the contradiction generated between low intrinsic frequency and large static deformation of a vibration isolator can be well regulated; the vibration isolation effect in the main bearing direction and anti-swinging performance in the non-bearing-direction of the vibration isolator are achieved at the same time; and a new path is provided for reducing vibration and noise of a ship or warship.

The invention discloses an all-optical wavelength/code type conversion device, relates to the field of optical network communication, and realizes all-optical wavelength/code type conversion of various code type signals of polarization division multiplexing (PDM), orthogonal polarization and frequency division multiplexing (OPFDM), single polarization signals and the like. The device comprises a first pump light transmitting device, a second pump light transmitting device, a pump light controller and a polarization maintaining coupler, wherein the first pump light transmitting device transmits first pump light in an x polarization state; the second pump light transmitting device transmits second pump light in a y polarization state; the pump light controller adjusts the first pump light transmitting device and the second pump light transmitting device, so that the frequencies of the first and second pump light, the frequency of signal light to be converted and the frequency of conversion signal light of a target wavelength/code type meet a preset relationship; the first and second pump light are coupled by the polarization maintaining coupler and input into a nonlinear optical waveguide; and in the nonlinear optical waveguide, the signal light to be converted and dual pump light input by the polarization maintaining coupler are subjected to a four-wave mixing effect, and signal light with the target wavelength is generated. The device is mainly applied to an optical network.

The invention provides a variable-frequency flexible tuning device. The variable-frequency flexible tuning device comprises a rotation transformer, a DC driving motor and a current collection ring, wherein a rotor winding of the rotation transformer is connected with the current collection ring, and the DC driving motor is used for driving the rotation transformer so as to change a rotor rotational speed and a rotor side transmission power of the rotor of the rotation transformer. Compared with the prior art, the variable-frequency flexible tuning device provided by the invention has the advantages that the rotor rotational speed and the rotor side transmission power of the rotation transformer are adjusted by adjusting an output torque of the DC driving motor, and electric quantity parameters such as a frequency, voltage amplitude and a phase of an output signal of the variable-frequency flexible tuning device can be further flexibly adjusted.

The invention belongs to the technical field of air conditioner compressors, and particularly relates to a volume-variable air conditioner compressor. The volume-variable air conditioner compressor comprises a fixing base, a motor, an air cylinder, two pistons, an air inlet valve, an air outlet valve, a speed regulating module, an output bevel gear, a transmission module, a regulating module and extension springs; the motor is installed on the fixing base through the speed regulating module; the speed regulating module is used for regulating the transmission ratio of the motor; the output bevel gear is installed on a rotation shaft of the motor through a key; the output bevel gear meshes with the transmission module; the transmission module is installed in the middle of the air cylinder; the two pistons are symmetrically arranged in the air cylinder, and the transmission module is used for controlling the two pistons to be close to each other or far away from each other; the regulatingmodule is installed in the transmission module and used for regulating the movement stroke of the pistons; and one end of each extension spring is fixedly connected with the corresponding piston, andthe other end of each extension spring is fixedly connected to the inner wall of the air cylinder. According to the volume-variable air conditioner compressor, regulating of the compression frequencyand the compression efficiency is achieved through the regulating module and the speed regulating module, so that the volume-variable air conditioner compressor adapts to using occasions with different loads.

The invention discloses a passive Q-switched all-fiber laser which comprises an oscillator stage. The oscillator stage comprises a pumping source, a coupler, a first grating, a first doped fiber, a Q-switched element and a second grating, wherein the Q-switched element is an Sm<3+> saturable absorber fiber, and the Q-switched element is closely arranged before or behind the first doped fiber. In the passive Q-switched all-fiber laser provided by the invention, the Sm<3+> saturable absorber fiber is used as a passive Q-switched element. Compared with the active Q-switched scheme of AOM (Acoustic Optical Modulator), in the passive Q-switched all-fiber laser provided by the invention, radio frequency drive is omitted in the AOM, and system complexity and high losses caused by an AOM element are reduced, meanwhile, the cost is greatly reduced, the system structure is simplified and the system stability is improved, so that producibility is easier to realize.

The invention discloses a detecting device of a liquid crystal display and a method thereof, belonging to the field of detection technology. The detecting device executes a plurality of detection stages for the liquid crystal display in sequence according to detection parameters set by users. Each detection stage sequentially comprises the following steps of: turning on and turning off a power supply many times, and detecting whether the display picture of the liquid crystal display and the control function are normal or not. Each round of turning on and turning off the power supply includes a step of turning on the power supply once to provide power for the liquid crystal display and a step of turning off the power supply once to stop providing power to the liquid crystal display. The frequency and time for turning on and turning off the power supply in each detection stage are the same, while the duty ratios of turning on and turning off the power supply are different. When the display picture of the liquid crystal display or the control function is abnormal, the liquid crystal display does not pass the detection. When all the detection stages are executed and the display picture of the liquid crystal display or the control function is normal, the liquid crystal display passes the detection.

The invention relates to a dotting method for road and bridge construction of municipal construction. According to the dotting method, a dot distance adjustable type dotting device is utilized to dot. The dot distance adjustable type dotting device comprises a shell, a walking wheel, driving wheel, a transmission roller, a driven wheel and a dotting device body. The dotting method comprises the following steps: step 1, pushing the walking wheel to walk; step 2, transmitting and driving the dotting device body to dot; step 3, primarily adjusting a dotting frequency; step 4, secondarily adjusting a dotting frequency. The dotting method for road and bridge construction of municipal construction disclosed by the invention is simple to operate, the dotting device body is arranged on a construction position needing dotting, then the dotting device body is slightly pushed to enable the walking wheel to rotate to achieve dotting operation; furthermore, dotting distance adjustment is achieved by rotating a first nut and a second nut.

The invention relates to a composite loading test device of torsion and cutting of an air spring. The composite loading test device comprises a simulated bogie device and a simulated train body device. The simulated bogie device includes a crank connecting rod oscillating workbench. The simulated train body device consists of a vertical oil cylinder assembly and a horizontal oil cylinder assembly; the horizontal oil cylinder assembly is arranged along the front-back direction of the crank connecting rod oscillating workbench; an air spring is clamped between the vertical oil cylinder assembly and the crank connecting rod oscillating workbench; and the horizontal oil cylinder assembly and the crank connecting rod oscillating workbench are hinged. The vertical oil cylinder assembly applies a vertical load on the air spring. The horizontal oil cylinder assembly and the crank connecting rod oscillating workbench form a crank connecting rod mechanism. When the horizontal oil cylinder assembly stretches out and draws back, the air spring makes arc torsional pendulum motions along a front-back direction with oscillating of the crank connecting rod oscillating workbench; and a horizontal cutting load and a horizontal torsion load are applied on the air spring. Besides, a vertical sensing assembly is installed on the vertical oil cylinder assembly and a horizontal sensing assembly is installed at the horizontal oil cylinder assembly.

The invention discloses a focal plane mechanical shutter for an aerial camera. The focal plane mechanical shutter comprises a continuous tightening mechanism, an exposure control mechanism and a shooting signal obtaining mechanism. The invention also provides an optical apparatus. The focal plane mechanical shutter of the aerial camera, provided by the invention can realize control of high-frequency continuous exposure motion of the shutter and can accurately adjust the exposure time, the exposure quantity and the exposure work frequency of the shutter.

The invention relates to an interference signal sensing, detecting and avoiding method of a wireless remote transmission multi-frequency point set copy system. The method includes the following steps: (1) when a master station of the wireless remote transmission multi-frequency point set copy system sends data acquisition instructions to concentrators, concentrators of branch networks of a downlink channel are used for judging whether interference signals exist; (2) if the interference signals exist, the branch networks with the interference signals are used for judging whether the interference signals affect operation of the corresponding branch networks; if the operation of the corresponding branch networks is affected, the concentrators of the branch networks send delay information to the master station and wait; the master station calls the concentrators of the branch networks to perform data acquisition; the concentrators of the branch networks are used for judging whether the interference signals exist and whether the operation of the branch networks is affected again; if the interference signals exist and the operation of the branch networks is affected, and the step (2) is returned until the operation of the branch networks is not influenced. The method guarantees normal communication of the system, is unique, simple to operate and obvious in effect and greatly improves anti-same-frequency-interference capacity of the multi-frequency point set copy system.

The invention discloses a jitter tolerance simulation verification method of a clock data recovery circuit. The jitter tolerance simulation verification method is implemented through the following three modules: a test data generating module, a clock data recovery (CDR) circuit and an error code detection module, wherein the test data generating module generates a pseudo random sequence superposed with jitter information as an input of the CDR circuit, consists of a jitter modulating clock and a pseudo random code generating module, and is implemented via VerilogA language design; the error code detection module performs an error code detection on an output data file of CDR simulation, and is implemented through Python scripts. The jitter tolerance simulation verification method comprises the following two steps: first, simulating the test data generating module and the CDR circuit to obtain the output data file of the CDR; then, performing the error code detection on the output data file by using the error code detection module. By the jitter tolerance simulation verification method, the jitter resistance of the CDR is evaluated in a design stage, so that tape-out risks are effectively reduced; in addition, the jitter tolerance simulation verification method is easy to implement and short in verification time and has relatively strong practicability.

The present invention discloses a high-speed pulse output duty ratio automatic regulation method based on a CPLD (Complex Programmable Logic Device). The method concretely comprises the following steps of: S1: depositing a high-speed pulse output duty ratio emitted by a high-speed pulse output EBRSRAM block in the CPLD into a plurality of frequency and duty ratio registers so understand the emitted high-speed pulse output duty ratio; and S2: allowing the high-speed pulse output EBRSRAM block to emit high-speed pulse and act to an MOS tube output module, wherein the output high-speed pulse frequency duty ratio is output according to a preset value to directly control the output of the MOS tube output module. The high-speed pulse output duty ratio automatic regulation methods output frequency values and duty ratio values read in the high-speed pulse output EBRSRAM block registers through a frequency and duty ratio state machine and compares the frequency values and duty ratio values readin the high-speed pulse output EBRSRAM block registers through the frequency and duty ratio state machine with frequency values and duty ratio values of the registers in the high-speed pulse output feedback EBRSRAM block so as to achieve automatic regulation of the high-speed pulse duty ratio of the PLC (Programmable Logic Controller) controller, reduce the deviation of the output high-speed pulse duty ratio and a preset value and ensure the high-speed pulse output of the PLC.

The invention relates to a heat exchange device based on vibration enhanced heat exchange. The heat exchange device comprises a box body and a pipeline, a cold water pipe inlet end is arranged at thebottom of the box body, a cold water pipe outlet end is arranged at the top of the box body, a hot water pipe inlet end is arranged at the upper part of the right side wall of the box body, a hot water pipe outlet end is arranged at the lower part of the right side wall of the box body, a floating mass block is connected to the left wall surface in the box body through springs, a fixing block is arranged at the center of the inner right wall surface in the box body, slideways with dovetail grooves are symmetrically arranged on the inner front wall surface and the rear wall surface of the box body, displacement constraint blocks matched with the slideways are arranged in the slideways, the pipeline extends from the hot water inlet end into the box body from top to bottom in an S shape by atleast four layers to penetrate out of the hot water outlet end, a bent section at the left end of the pipeline is connected to the floating mass block, a bent section at the right end of the pipelineis connected to the fixing block, a plurality of resonators sleeve the whole pipeline at intervals, and the displacement constraint blocks sleeve the first layer of pipeline. According to the heat exchange device, the heat exchange efficiency is improved on the premise that the heat exchange area is not increased, the material consumption is reduced, the structure is compact, the installation isconvenient, and the heat exchange device is suitable for the aspects such as rapid cooling and waste heat recovery.

A frequency reconfigurable sensing patch antenna include microstrip feeder, a dielectric substrate, a radiating sheet and a ground plane, wherein the microstrip feed line is connected with the radiating sheet, the microstrip feed line and the radiating sheet are all stuck on the front side of the dielectric substrate, the ground plane is stuck on the back side of the dielectric substrate, and theground plane and the microstrip feed line are located at the same end of the dielectric substrate; A first branch and a second branch are respectively arranged on the two sides of the radiation sheet,and the first branch and the second branch are respectively provided with a first capacitor and a second capacitor at the connection with the radiation sheet; The first branch and the second branch are respectively provided with a first diode and a second diode. The antenna of the invention has the advantages that the antenna is a patch structure, the volume is small, the structure is simple andreasonable, and the antenna frequency is changed by using the on or off states of the first diode and the second diode, thereby realizing the reconfigurable antenna frequency.

The invention discloses a fractal technology-based chipless RFID (radio frequency identification) tag and an RCS (radar cross section) amplitude coding method thereof. The tag comprises a dielectric substrate and a plurality of resonators, wherein the upper surface is provided with a metal layer, the resonators are arranged on the metal layer of the dielectric substrate, and the resonator comprises a slit in the metal layer and metal strips in the slit, wherein the slit includes a central vertical slit and a central transverse slit intersecting with each other perpendicularly at an intersection. The tag is characterized in that the at least one resonator structure is subjected to fractal technology processing: a plurality of transverse slits are uniformly distributed at two sides of the central transverse slit additionally with the central transverse slit adopted as a symmetry axis; a plurality of vertical slits are uniformly distributed at two sides of the central vertical slit additionally with the central transverse slit adopted as a symmetry axis; and a vertical metal strip in the central vertical slit intersects with a center transverse metal strip in the central transverse slit at an intersection. The tag of the invention has the advantages of high frequency spectrum utilization, un-correlation to polarization directions, single-layer structure, simplicity and easiness in processing.

The invention discloses a pulse frequency modulation circuit based on a voltage controlled oscillator, and relates to a switch power supply circuit. The pulse frequency modulation circuit comprises a work circuit which is switched between a charge mode and a discharge mode under the effect of pulse modulation signals; a control circuit which generates the pulse modulation signals according to first reference voltages, voltage feedback signals and frequency variable clock signals and comprises an error amplifier providing error amplification signals; a clock signal generator which comprises an annular oscillation unit generating clock signals with fixed frequencies under the effect of power supply voltages; and an adjustment unit which is connected between the power supply voltages and the annular oscillation unit for adjusting work currents of the circuit under the effect of the error amplification signals so as to adjust the clock signals. According to the invention, the size of the work currents of the clock signal generator is adjusted through the error amplification signals, the oscillation frequency is changed, the frequency of the clock signals is finally adjusted, needed pulse modulation signals are obtained, the cycle is stable, and ripples of output voltages are reduced.

The invention discloses an adjustable flexible vibration test bench, and the test bench comprises a pedestal. The upper surface of the left side of the pedestal is vertically connected with a rotating shaft support seat, and the top of the rotating shaft support seat is provided with a rotating shaft. The rotating shaft support seat is hinged to a rocking arm through the rotating shaft, and the central part of the upper surface of the rocking arm is provided with a first chute. The right side of the upper surface of the rocking arm is provided with a second chute, and the right side of the lower surface of the rocking arm is provided with a third chute. The central part of one end of the rocking arm is provided with a speed sensor. The first chute on the rocking arm cooperates with a horizontal sliding block, so the test bench can adjust the distance from the horizontal sliding block to the rotating shaft conveniently, changes the amplitude side, and employs the rotation of a rotating disc and the elastic force of a first tension spring as the power of the vertical vibration of the rocking arm. The first tension spring is convenient to replace, thereby guaranteeing the vibration intensity and effect, and prolonging the service life. The test bench effectively adjusts the amplitude and frequency of the rocking arm through the combination of a second tension spring and a third tension spring.

The invention relates to a preparation device and a preparation method of carbon quantum dots. The preparation device comprises an electro-discharge container, absolute ethyl alcohol, two conductive needles and a power supply; the absolute ethyl alcohol is arranged in the electro-discharge container; the two conductive needles are arranged in the absolute ethyl alcohol; and one conductive needle is connected with the power supply, and the other conductive needle is externally grounded. When the conductive needle is electrified by the power supply, plasma is generated between the two conductiveneedles so as to break through the absolute ethyl alcohol to discharge electricity. Carbon quantum dots are prepared while hydrogen is produced through ethanol reforming, the device is simple, the equipment requirement is low, no catalyst is needed in the reaction, and the reaction condition is simple. Besides, absolute ethyl alcohol is electrolyzed through the conductive needles, hydrogen and carbon quantum dots are prepared at the same time, the generated carbon quantum dots can play a role in photocatalysis on electrolysis of the absolute ethyl alcohol, the yield of the hydrogen and the carbon quantum dots is increased, positive feedback is formed, dual purposes are achieved, time cost and financial resources are greatly saved, and the utilization rate of ethyl alcohol and energy is increased.

The invention discloses a double-frequency slot antenna and a tuning method thereof, wherein the double-frequency slot antenna is etched on the upper surface of a dielectric substrate. The upper surface of the dielectric substrate is coated with a metal layer which serves as a metal radio frequency field. The double-frequency slot antenna comprises a folded slot resonator and a coplanar waveguide step impedance resonator, wherein the former consists of a first groove wire, two second groove wires, two third groove wires, two fourth groove wires and two fifth groove wires, and the latter is connected with the metal radio frequency field through a metal wire and feeds power to the multi-mode slot resonator through a coplanar waveguide whose end is of a T-shape. According to the invention, through the utilization of a multi-mode slot resonator and through the power feeding of a coplanar waveguide, the double-frequency characteristics of an antenna can be achieved; and in addition, the tuning method for the double-frequency slot antenna can tune the resonation frequencies of the antenna through the adjustment of the design dimension parameters of the antenna so as to effectively adjust the central working frequency and the bandwidth characteristics of the antenna.

The invention relates to an intelligent virtual fitting method and system, a terminal and a storage medium, and belongs to the field of image processing, and the method comprises the steps of obtaining a fitting request of a current user for a current intelligent fitting mirror; carrying out image acquisition on a current user and obtaining modeling image data; performing face recognition on the current user, and obtaining historical shopping information corresponding to the user identity according to a recognition result; determining shopping preference information of the current user; determining a sub-clothing library which most fits the shopping preference of the current user in a preset clothing database; acquiring clothing information and a current clothing model in the sub-clothing library; obtaining body shape parameters of a user and establishing a human body three-dimensional model; fusing the human body three-dimensional model with the current clothing model to obtain a three-dimensional fitting image; and controlling a display screen to display the three-dimensional fitting image. The application has the effects of simplifying the use steps of the intelligent fitting mirror and improving the use feeling of the user.