36results about How to "Guaranteed linear relationship" patented technology

The invention discloses a fiber grating displacement meter. The displacement meter comprises anchor flukes, connecting pieces, elastic pieces, sensors, cantilever beams and a casing, wherein the casing is fixed to the bottom surface of a top plate; holes are formed in the top plate and go deep into a rock mass; the anchor flukes are fixed to the base points of the holes and are connected with the free ends of the cantilever beams through the connecting pieces and the elastic pieces; the other ends, which are opposite to the free ends, of the cantilever beams are fixed ends; the fixed ends are fixed on the casing; and the sensors are stuck to the cantilever beams. The displacement meter provided by the invention has a wide application range, can be applied to top plate sinkage monitoring for various tunnel projects and subway projects and can ensure measuring accuracy.

The invention relates to a seismic prospecting technology which is a method of determining a carbonate reservoir structure. The concrete steps are as follows: wave field reconstruction parameters are obtained by using a field observation system; type parameters corresponding to an underground geological structure are obtained by processing data, a discrete strata property model is established; wave field values on various discrete mesh points at each moment are reconstructed, and wave fields of the positions where a detection point is positioned at each moment are taken as a wave field reconstruction record; and sections obtained by the wave field reconstruction are compared with stacked and migrated sections obtained by processing the field acquisition data to determine the distribution, and the fracture development direction and the development degree of an underground carbonate reservoir. The technology is applicable to the wave field reconstruction of any completed structure, has the ability of determining underground oil-gas reservoir structures, and has the characteristics of high accuracy, high efficiency, low frequency dispersion and improving the calculation efficiency.

A modularized atomic energy microscope is disclosed, comprising seven modules. The first one is stepper motor the second is sample support with four-dimensional adjustment fixed on stepper motor, the third is z direction scanner, the fourth consists of microbracket needle point and focusing lens, the fifth is xy direction scanner, the sixth consists of semiconductor laser with focusing lens, reflector, imaging lens and four-quadrant photoelectric sensor, the seventh consists of optical microscope, CCD camera, monitor. The invention has convenient adjustment and replacement to modularized atomic energy microscope, and using each module to construct atomic energy microscope with different structure is easy and sample has function of coarse positioning.

The invention discloses a current coordination control method of an electrically-excited synchronous motor, which belongs to the field of motor control. In the method, an exciting current, a torque current and a compensation current in a electrically-excited synchronous motor system are defined. Under coordination control of the currents, a stator q shaft current serves as the exciting current and is used for generating an air gap magnetic field so as to keep a stator air gap flux linkage constant; a rotor current serves as the torque current and acts with the air gap magnetic field to generate electromagnetic torque; and a stator d shaft current serves as the compensation current, and a certain proportion relation is maintained between the stator d shaft current and the rotor current, so that a stator air gap magnetomotive force and a rotor air gap magnetomotive force in the direction of a d shaft are cancelled. The realization mode of the method is simple, the magnetic circuit saturation problem under a heavy duty is overcome, the linear relation between the electromagnetic torque and the torque current can be basically maintained if multiple overload torque is output, and the torque output capability is substantially improved; in addition, the torque response speed is greatly improved, and the problem of an insufficient inverter output voltage under the heavy duty condition is solved.

The invention relates to a segment matching and prefabricating method for a large-scale standardized structural element, in particular to a segment matching and prefabricating method for segment matching and prefabricating on the large-scale standardized structural element through a poured pedestal. The method includes the first step of installing a segment steel reinforcement cage on the poured pedestal, the second step of installing a formwork, the third step of carrying out full-section concrete pouring on the segment steel reinforcement cage, the fourth step of dismantling the formwork on a structural element segment and completing supporting system conversion on the structural element segment, the fifth step of pushing the structural element segment in place according to a preset segment pushing distance, the sixth step of repeating the above steps till full-section concrete pouring on the last structural element segment is completed, the seventh step of dismantling the formwork on the last structural element segment and completing the supporting system conversion on the structural element segment, and the eighth step of pushing all the structural element segments to designed positions. According to the method, full-section concrete pouring is carried out on the poured pedestal; various structural element segments can be prefabricated through the same poured pedestal, so the various structural element segments can be prefabricated and molded strictly according to the same size and specification.

The invention relates to a double-trailing arm type steering independent suspension for an electric bus driven by wheel-side motors. The double-trailing arm type steering independent suspension comprises a left suspension, a right suspension, steering linkages, a steering rocker arm, an angle sensor and a steering actuating cylinder. According to the double-trailing arm type steering independent suspension disclosed by the invention, drive motors are arranged at wheel positions of the bus; each drive motor is located on the side of an output shaft of each of speed reducers; each speed reducer is fixed to each of supporting arms; the output shaft of each speed reducer penetrates through a center hole of each supporting arm and is connected with each of wheel-side structures of the bus, and a wheel of each wheel-side structure is driven to rotate, so that the driving to the bus is realized; the supporting arms are designed with high load-bearing performance to replace a conventional supporting arm structure, so that a shock absorber and a steering mechanism can be directly connected with the supporting arms, the steering and the locking of the bus are facilitated, and beside, the purposes of increasing the interior space of the bus and reducing the height of a bus floor can be realized.

The invention discloses a micro-electro-mechanical system platform, including a platform main body, an optical detection mechanism and an external packaging plate. The platform main body comprises a vibration platform. The external packaging plate forms a confined space, and the platform main body and the optical detection mechanism are enclosed in the sealed space. The optical detection mechanism includes a laser, a reflector and a diode array. The reflector is horizontally fixed to the top of the vibration platform with the mirror facing the top of the external packaging plate. The laser and the diode array are located inside the top of the external packaging board, and the diode array includes a plurality of photodiodes. The diode array encloses the laser. The light emitted from the laser is irradiated onto the reflector and the reflected light formed by the reflection of the reflector is irradiated onto the diode array. The diode array detects the light intensity of the reflected light. The micro-electro-mechanical system platform improves the linearity of the measurement result and improves the detection precision.

The invention discloses a triaxial quartz flexure accelerometer small-size signal sampling device comprising an accelerometer. The device also comprises a signal collection mechanism that comprises apre-amplification module, a switch module, a differential amplification module, an AD conversion module and a controller-integrated FPGA main control module which are sequentially connected with the accelerometer in series; and the switch module is also connected with the FPGA main control module. By using the triaxial quartz flexure accelerometer small-size signal sampling device adopting the abovementioned structure provided by the invention, a digital sub-system substrate and an analog sub-system substrate are perpendicularly interconnected via solder balls, so that the whole size is reduced, the miniaturization is achieved; meanwhile, by using the FPGA main control module, the collection and conversion from an accelerometer analog signal to a digital signal are achieved, the linear relation between the output digital signal and the acceleration signal is ensured, and the stability of zero and scale can be ensured, so that the performance of the header of the accelerometer is furthest ensured.

The invention discloses a capacitive liquid level sensor and a manufacturing method thereof. The liquid level sensor comprises a surface PDMS layer, a Si structure layer and a bottom glass layer, wherein the Si structure layer and electrodes are obtained through a process combining DRIE dry etching and wet etching; a closed liquid cavity is formed through ion bonding and the PDMS layer, and the change of electrolyte between capacitance polar plates is caused by the change of the liquid level, so that the electric charge between the capacitance polar plates is changed; the change of the liquid level between the polar plates can be detected through a peripheral circuit. Due to the fact that the distances are equal everywhere, the volume of the liquid between the polar plates can be calculated accurately and directly; the second embodiment of invention can achieve accurate monitoring of the characteristic liquid level, and overall continuous observation can be achieved. The liquid sensor has the advantages of being sensitive in reaction, low in manufacturing cost, high in precision and the like.

The invention discloses a distribution method of third-order intermodulation distortion parameters applied inside a receiver radio-frequency system circuit, which belongs to the technical field of electromagnetic compatibility. The distribution method comprises the following steps: firstly processing the overall receiving performance index of a receiver radio-frequency system according to nonparasitic response to obtain a threshold voltage; then computing the total distortion voltage of third-order intermodulation distortion in each level of sub circuit, which is about to enter a received passband according to constraint relation; and finally obtaining the third-order cut-off point of each level of sub circuit according to the relation that the total distortion voltage is smaller than and equal to the threshold voltage. The method of the invention realizes the distribution of the third-order intermodulation distortion parameters of each level of sub circuit under the condition of cascade circuit voltage signal in-phase, thereby the problem of poor communication quality caused by overlarge third-order intermodulation distortion signal interference of the receiver radio-frequency system is solved.

The invention discloses a power system of a flight test with power of a low-speed wind tunnel model. The power system comprises a wind tunnel test section, an aircraft model and a power system. The power system comprises a needle valve, a high pressure hose, a swivel joint, a plenum chamber and a nozzle. The needle valve is arranged outside the wind tunnel test section. One end of the high pressure hose is connected to the needle valve, and the other end of the high pressure hose is connected to the rotation end of the swivel joint. The fixed end of the swivel joint is fixed at the top of the aircraft model. The plenum chamber is arranged in the aircraft model and communicates with the swivel joint. The nozzle is arranged at the tail part of the aircraft model, and the inlet end of the nozzle communicates with the plenum chamber through a pipeline. According to the power system, the requirement of the flight test with power of the wind tunnel model can be satisfied, the power density provided by the power system is large, the response is fast, the occupied space is small, the power system can be installed in the aircraft model, the service life is long, and the aircraft model motion interference is small.

The invention relates to a fluid proportioning valve with a pressure balancing device and an application thereof. The fluid proportioning valve comprises a shell, wherein a first valve cavity and a second valve cavity which are connected are formed in the shell; a pressure balancing unit is arranged in the first valve cavity; a center valve body and a center valve core are arranged in the second valve cavity; a valve body inlet A and a valve body inlet B are formed in the center valve body; a valve core inlet A and a valve core inlet B which are respectively matched with the valve body inlet A and the valve body inlet B are formed in the center valve core; and the flow areas of fluid A and fluid B are adjusted by rotating the angle of the center valve core in the center valve body, further the proportioning of the two fluids is adjusted, and the outflow of mixed fluid is adjusted by linear displacement of the center valve core. The fluid proportioning valve can set the volume ratio of the fluids after mixing at random, meanwhile can adjust the outflow of the mixed fluid and is relatively high in efficiency and good in timeliness.

The invention provides a device and method for testing the drag reduction performance of a super-hydrophobic surface and belongs to the technical field of surface drag reduction performance testing. The problems that existing super-hydrophobic surface drag reduction performance test is low in accuracy, limited in use, high in cost, complex in test process and poor in temperature characteristic aresolved. The device of the invention comprises a water tank, a test flow channel mechanism, a frictional resistance detection mechanism and a data processing mechanism, wherein the test flow channel mechanism is formed by sequentially connecting a water tank outlet, a water pump, a throttle valve, a flow meter and a spray pipe through a water flow pipeline; the frictional resistance detection mechanism comprises an elastic unit, a lever, a hinge and a displacement sensor; and the displacement sensor is in communication connection with the data processing mechanism. The device and method are mainly used for testing the drag reduction performance of the super-hydrophobic surface.

The invention relates to the technical field of mobile communication 3G / 4G power amplifiers. A design method that a Doherty PA (power amplifier) and a Cartesian feedback loop are combined is adopted, and respective advantages of the Doherty PA and the Cartesian feedback loop are combined. When an input signal is a 3G / 4G signal of which the peak average is higher, the system efficiency can be greatly improved by the Doherty PA, and the problems of EVM, ACPR and the like brought by the non-linear distortion of the Doherty PA are corrected by the Cartesian feedback loop, and therefore the communication system provided by the invention exceeds a traditional system in two aspects of linearity and power efficiency.

Provided is a camera module, and a camera module, according to an embodiment, comprises: a core plate having a cavity for accommodating a conductive liquid and a nonconductive liquid; an electrode unit disposed on the core plate and electrically connected to the conductive liquid; an insulating unit disposed in the electrode portion and blocking contact of the nonconductive liquid; and a control unit for controlling voltages applied to the electrode unit, wherein the electrode unit includes a first electrode and a second electrode that change the interface between the conductive liquid and thenonconductive liquid by electromagnetic interaction, the first electrode includes a plurality of electrode sectors arranged sequentially along a circumferential direction about an optical axis, and the control unit includes a liquid lens that sequentially controls voltages applied to the plurality of electrode sectors.

A modularized atomic energy microscope is disclosed, comprising seven modules. The first one is stepper motor the second is sample support with four-dimensional adjustment fixed on stepper motor, the third is z direction scanner, the fourth consists of microbracket needle point and focusing lens, the fifth is xy direction scanner, the sixth consists of semiconductor laser with focusing lens, reflector, imaging lens and four-quadrant photoelectric sensor, the seventh consists of optical microscope, CCD camera, monitor. The invention has convenient adjustment and replacement to modularized atomic energy microscope, and using each module to construct atomic energy microscope with different structure is easy and sample has function of coarse positioning.

The invention discloses a sampling hold circuit, an analog-to-digital converter and a wifi chip. The sampling hold circuit comprises a clock generation sub-circuit, a grid voltage bootstrap sub-circuit and a sampling field effect transistor; the grid voltage bootstrap sub-circuit outputs a second control signal to a grid electrode of the sampling field effect transistor, the voltage is the sum of the conduction voltage and the input voltage of the signal input end, and the conduction voltage is greater than the input voltage of an external power supply. The circuit does not introduce non-ideal harmonic waves, eliminates the interference of the input voltage of the signal input end on the sampling field effect transistor, does not generate negative influence on the output signal-to-noise ratio of the analog-to-digital converter, reduces the on-resistance of the sampling field effect transistor, and improves the response speed of the switch; the strict linear relation between the input signal and the output signal of the sampling hold circuit is guaranteed, and the performance of the circuit is improved.

The invention relates to method for identifying maize intercross species by using a molecular marker, which is characterized by comprising the following steps of: extracting the endosperm, leaf blade and parental leaf blade DNA of a maize intercross species to be inspected; developing an InDel marker and screening out a codominant marker among parents according to the sequence difference among parent genomes; analyzing the quality of amplification products of leaf blade DNA allelic genes of the intercross species to determine the molecular marker of the maize intercross species; searching the PCR exponential amplification phase of the marker, clearly expressing the cycle number of the amplification products on agarose gel, and amplifying the endosperm and leaf blade DNA of the intercross species in the same batch; quantitatively analyzing an electrophoretic band to obtain the measured value of relative amount of amplification products of leaf blade and endosperm allelic genes of the intercross species; obtaining the theoretical value of relative amount of amplification products of endosperm allelic genes according to the measured value of relative amount of amplification products of leaf blade allelic genes of the intercross species; and counting the measured value and the theoretical value of relative amount of amplification products of endosperm allelic genes of the intercross species to be inspected by using a Chi-square test, calculating the probability P, and judging the intercross species.

The invention discloses a double-wheel hub electric vehicle Hall differential control system. The system comprises a control circuit power supply, an electric vehicle pedal governor, a left wheel hubmotor controller, a right wheel hub motor controller and an electric vehicle differential controller, the differential controller is internally sequentially fixedly connected with magnetic steel A, magnetic steel O and magnetic steel B, racks are arranged on the sides of the magnetic steel A, the magnetic steel O and the magnetic steel B, the ends of the racks are fixed to left Hall elements, theother ends are fixed to right Hall elements, the left Hall elements are located between the magnetic steel A and the magnetic steel O, the right Hall elements are located between the magnetic steel Oand the magnetic steel B, and the racks and a driving rotating shaft of a steering system of the electric vehicle are in drive connection. According to the above structure, the double-wheel hub electric vehicle Hall differential control system changes the distance between the Hall elements and the magnetic steel on the racks by the movement of the racks to change the intensity of the magnetic field of the magnetic steel on the Hall elements, and forms the output voltage inverse linear change of the Hall elements at both ends.

The invention provides a hyperspectral remote sensing image abundance estimation method and device based on conditional number weighting. The method comprises the following steps: acquiring a hyperspectral data matrix and an end metadata matrix; performing wavelet packet decomposition on the hyperspectral data matrix and the end metadata matrix by using biorthogonal wavelets to obtain corresponding wavelet packet trees; obtaining a coefficient matrix at each node of a wavelet packet tree corresponding to the end metadata matrix; calculating the condition number of each coefficient matrix; calculating the weight of each node according to each condition number; and taking the hyperspectral data matrix and the end metadata matrix corresponding to each node as the input of the least square method, multiplying the result output by the least square method each time by the weight of the corresponding node, and finally summing each node to obtain an abundance estimation result. According to the method, the conditional number of the coefficient matrix after wavelet packet decomposition is used for weighting, effective information in the data can be utilized to a greater extent, and therefore the least square estimation is improved, and the unmixing precision of the hyperspectral remote sensing image is improved.

The invention discloses a power system of a flight test with power of a low-speed wind tunnel model. The power system comprises a wind tunnel test section, an aircraft model and a power system. The power system comprises a needle valve, a high pressure hose, a swivel joint, a plenum chamber and a nozzle. The needle valve is arranged outside the wind tunnel test section. One end of the high pressure hose is connected to the needle valve, and the other end of the high pressure hose is connected to the rotation end of the swivel joint. The fixed end of the swivel joint is fixed at the top of the aircraft model. The plenum chamber is arranged in the aircraft model and communicates with the swivel joint. The nozzle is arranged at the tail part of the aircraft model, and the inlet end of the nozzle communicates with the plenum chamber through a pipeline. According to the power system, the requirement of the flight test with power of the wind tunnel model can be satisfied, the power density provided by the power system is large, the response is fast, the occupied space is small, the power system can be installed in the aircraft model, the service life is long, and the aircraft model motion interference is small.

The invention relates to a dual-fuel engine accelerator opening detection device and an installation method of the dual-fuel engine accelerator opening detection device. The dual-fuel engine accelerator opening detection device comprises a rotating potentiometer and an oil mass adjustment lever connected with an accelerator pull cord. A linkage oscillating bar is arranged on a rotating shaft of the rotating potentiometer. The oil mass adjustment lever is connected with the linkage oscillating bar through a transmission pull cord. The length of the transmission pull cord is equal to the distance between the center of the rotating shaft of the rotating potentiometer and a rotating fulcrum of the oil mass adjustment lever. The distance between the point of junction of the transmission pull cord and the linkage oscillating bar and the center of the rotating shaft is equal to the distance between the point of junction of the transmission pull cord and the oil mass adjustment lever and the rotating fulcrum. According to the dual-fuel engine accelerator opening detection device and the installation method of the dual-fuel engine accelerator opening detection device, the fact that the rotation angle of the rotating potentiometer truly reflects actual accelerator opening information of an engine can be ensured, a reliable linear relation between accelerator opening and output signals of the rotating potentiometer is kept, and accuracy of detection of the accelerator opening is improved.

The invention relates to a fluid proportioning valve with a pressure balancing device and an application thereof. The fluid proportioning valve comprises a shell, wherein a first valve cavity and a second valve cavity which are connected are formed in the shell; a pressure balancing unit is arranged in the first valve cavity; a center valve body and a center valve core are arranged in the second valve cavity; a valve body inlet A and a valve body inlet B are formed in the center valve body; a valve core inlet A and a valve core inlet B which are respectively matched with the valve body inlet A and the valve body inlet B are formed in the center valve core; and the flow areas of fluid A and fluid B are adjusted by rotating the angle of the center valve core in the center valve body, further the proportioning of the two fluids is adjusted, and the outflow of mixed fluid is adjusted by linear displacement of the center valve core. The fluid proportioning valve can set the volume ratio of the fluids after mixing at random, meanwhile can adjust the outflow of the mixed fluid and is relatively high in efficiency and good in timeliness.

The invention discloses an unfavorable geologic body controlling infiltration chemical grouting method, which mainly aims at the common technical problem that grouting can be ineffective due to the out-of-control diffusion of grout caused by the local cleavage of low-stress surfaces when chemical grout is adopted for seepage prevention and reinforcement for an unfavorable geologic body. The small-section-length controlling infiltration grouting method invented by research is characterized in that (1) double-plug small-section-length top-down closing of sections; (2) linear control of the steady grouting rate; (3) setting of a grouting completion standard. The unfavorable geologic body controlling infiltration chemical grouting method is applicable to the seepage prevention and reinforcement of unfavorable geologic bodies or other unfavorable structural bodies by adopting chemical grout.

The invention discloses a current coordination control method of an electrically-excited synchronous motor, which belongs to the field of motor control. In the method, an exciting current, a torque current and a compensation current in a electrically-excited synchronous motor system are defined. Under coordination control of the currents, a stator q shaft current serves as the exciting current and is used for generating an air gap magnetic field so as to keep a stator air gap flux linkage constant; a rotor current serves as the torque current and acts with the air gap magnetic field to generate electromagnetic torque; and a stator d shaft current serves as the compensation current, and a certain proportion relation is maintained between the stator d shaft current and the rotor current, so that a stator air gap magnetomotive force and a rotor air gap magnetomotive force in the direction of a d shaft are cancelled. The realization mode of the method is simple, the magnetic circuit saturation problem under a heavy duty is overcome, the linear relation between the electromagnetic torque and the torque current can be basically maintained if multiple overload torque is output, and the torque output capability is substantially improved; in addition, the torque response speed is greatly improved, and the problem of an insufficient inverter output voltage under the heavy duty condition is solved.

The invention relates to a segment matching and prefabricating method for a large-scale standardized structural element, in particular to a segment matching and prefabricating method for segment matching and prefabricating on the large-scale standardized structural element through a poured pedestal. The method includes the first step of installing a segment steel reinforcement cage on the poured pedestal, the second step of installing a formwork, the third step of carrying out full-section concrete pouring on the segment steel reinforcement cage, the fourth step of dismantling the formwork on a structural element segment and completing supporting system conversion on the structural element segment, the fifth step of pushing the structural element segment in place according to a preset segment pushing distance, the sixth step of repeating the above steps till full-section concrete pouring on the last structural element segment is completed, the seventh step of dismantling the formwork on the last structural element segment and completing the supporting system conversion on the structural element segment, and the eighth step of pushing all the structural element segments to designed positions. According to the method, full-section concrete pouring is carried out on the poured pedestal; various structural element segments can be prefabricated through the same poured pedestal, so the various structural element segments can be prefabricated and molded strictly according to the same size and specification.

The invention discloses a capacitive liquid level sensor and a manufacturing method thereof. The liquid level sensor comprises a surface PDMS layer, a Si structure layer and a bottom glass layer, wherein the Si structure layer and electrodes are obtained through a process combining DRIE dry etching and wet etching; a closed liquid cavity is formed through ion bonding and the PDMS layer, and the change of electrolyte between capacitance polar plates is caused by the change of the liquid level, so that the electric charge between the capacitance polar plates is changed; the change of the liquid level between the polar plates can be detected through a peripheral circuit. Due to the fact that the distances are equal everywhere, the volume of the liquid between the polar plates can be calculated accurately and directly; the second embodiment of invention can achieve accurate monitoring of the characteristic liquid level, and overall continuous observation can be achieved. The liquid sensor has the advantages of being sensitive in reaction, low in manufacturing cost, high in precision and the like.

The invention discloses an MTC dye-based method for detecting blood unbound transferrin, and belongs to the technical field of clinical detection methods. An MTC dye is mixed with blood to be detected; when unbound ferritin in the blood is increased, the MTC aggregation form can be induced to be converted into J-aggregate; therefore, the color of the to-be-detected blood becomes blue; there is a maximum absorbance peak value at 660 nm, change of the concentration of the unbound ferritin in the blood is judged according to change of the color of the blood to be detected, and the concentration of the unbound ferritin in the blood is calculated according to the value of the absorbance of the blood to be detected, so that detection of the unbound ferritin in the blood is realized. According tothe detection method, only one MTC detection substance needs to be used, the steps are simple and convenient, interference factors are few, and therefore a detection result is stable. Meanwhile, according to the detection method disclosed by the invention, visual detection of the blood unbound ferritin based on the MTC dye is realized along with the visible color change.