16results about How to "Offset error" patented technology

The invention discloses a high-precision laser ranging system and method based on multi-frequency modulation, and relates to the field of laser ranging, and the system comprises a multi-frequency laser transmitting module which comprises generators of different frequency bands and can be independently regulated, rapidly switched and matched with a high-precision frequency modulation unit; the laser receiving and signal conditioning module is used for processing signals by using an avalanche photodiode, a low-noise preamplifier and the like; the signal processing and analyzing module is used for calculating the distance by means of a high-speed digital signal processor in combination with a multi-frequency distance measurement algorithm; a display and control module and a temperature compensation module are further included, the method comprises the steps of multi-frequency laser emission, receiving conditioning, signal processing, display control and temperature compensation, and high-precision distance measurement is achieved through fine operation according to environment and target characteristics. The method is high in distance measurement precision, and error compensation in a complex environment exceeds 90%; the adaptability is high, and automatic adjustment is achieved in different distances and environments; the real-time performance is good, and a result can be obtained within 10 milliseconds; operation is convenient, wireless and data management is supported, and laser ranging innovation is promoted.

The invention relates to a duplex guide vane full-automatic positioning, clamping and detecting device which comprises an automatic positioning seat and an electrical circuit quick-plug pressure-maintaining tray, the lower end of the automatic positioning seat is installed on the electrical circuit quick-plug pressure-maintaining tray, and the upper end of the automatic positioning seat is provided with a shape-following cambered surface matched with the duplex guide vane in shape. A plurality of positioning mechanisms, a plurality of positioning detection mechanisms and a plurality of airtight detection points are arranged on the follow-up cambered surface, an airtight sensor is arranged in each airtight detection point, a pressing mechanism is arranged at the upper end of the follow-up cambered surface, a floating supporting mechanism is arranged at the lower end of the follow-up cambered surface, and the floating supporting mechanism is provided with a movable supporting plate. The pressing mechanism is provided with a liftable pressing block, the lower side of the pressing block is an inclined face, and an auxiliary pressing cylinder is arranged on the inclined face. Automatic positioning and detection of the blade are achieved through the positioning mechanism and the positioning detection mechanism on the follow-up cambered surface at the upper end of the automatic positioning seat, the blade positioning and clamping efficiency is improved, overall off-line transfer can be achieved, and automatic production line integration is facilitated.

The invention belongs to the technical field of water quality monitoring, and particularly relates to an urban water supply network water quality monitoring and early warning method which comprises the following steps: S1, setting water quality monitoring points of a water supply network; s2, acquiring original time sequence data; s3, processing the original time sequence data through complete adaptive noise ensemble empirical mode decomposition CEEMDAN to obtain a plurality of IMF component subsequences; s4, calculating a sample entropy value of each IMF component sub-sequence by using a sample entropy SE, and carrying out merging reconstruction; s5, importing the merged and reconstructed IMF component subsequences into a water quality prediction model to obtain a prediction result of the water quality data; and S6, according to a prediction result of the water quality data, judging whether a water quality early warning condition is met, and if so, generating early warning information. According to the method, the water quality data of the water supply network can be effectively predicted, so that the water quality problem of the water supply network is effectively warned in advance, and the influence of the water quality problem on normal water use of residents is reduced as much as possible.

This invention provides a bus with a battery compartment bottom collision protection structure. The bus includes a frame, a battery compartment mounted on the frame, and a collision protection structure installed at the bottom of the battery compartment. The collision protection structure includes a bottom protection structure fixed to the frame, a bottom protection plate, and a reinforcing protection structure located above the bottom protection structure. The reinforcing protection structure includes multiple reinforcing beams arranged at intervals, with the ends of the reinforcing beams fixed to the frame. Adjacent reinforcing beams form accommodating spaces for the corresponding portions of the bottom protection plate to deform upwards. The battery compartment bottom collision protection structure provided by this invention enters the corresponding accommodating spaces when deformed under stress, thus preventing compression of the battery compartment bottom. This effectively solves the technical problem in the prior art where the battery compartment bottom protection structure deforms under stress, causing battery damage.

The present invention relates to the technical field of land surveying equipment, and discloses a high-precision construction land surveying device for national land space planning, comprising a hand pole, a mounting bracket arranged on the top of the hand pole, a measuring instrument arranged on the surface of the mounting bracket, and a vertical adjustment component arranged at the bottom of the hand pole, wherein the vertical adjustment component specifically comprises a grounding sleeve sleeved on the bottom of the hand pole, a connector flexibly connected between the hand pole and the grounding sleeve, a rotating groove provided on the inner wall of the grounding sleeve, a top supporting sleeve and a push spring slidably inserted into the storage groove. The high-precision construction land surveying device for national land space planning, by providing a vertical adjustment component, even if the grounding sleeve is in an inclined state when standing on the bottom surface, the rotating platform can still keep the horizontal platform upward and parallel to the horizontal plane due to the weight, so that the hand pole can be kept in a vertical state, and the measuring instrument is also kept vertical, and the influence of the ground environment is reduced, which is conducive to improving the measurement accuracy.

A baseband signal encoding method based on LDPC code relates to the technical field of baseband signal encoding. According to preset LDPC encoding parameters of a communication link, an original baseband signal is encoded to generate an encoded signal and transmit it; a receiving end decodes the received codeword to obtain an estimated bit sequence of the original baseband data and a bit error rate of a current feedback sliding window of each communication link; the receiving end obtains the signal-to-noise ratio level of each communication link according to the bit error rate of each communication link and a lookup table, and generates an optimal LDPC encoding parameter according to the lookup table, a bit error rate threshold, an occupied bandwidth corresponding to a codeword generated by different LDPC encoding parameters, a remaining bandwidth of each communication link and a signal-to-noise ratio level, and feeds back the optimal LDPC encoding parameter to a transmitting end; a transmitting end updates the preset LDPC encoding parameters of the communication link for the fedback encoding result, and meets the higher requirements of future wireless communications on speed, reliability and delay.

The utility model discloses a curtain wall across middle support relates to building outer dress technical field, and curtain wall across middle support includes board groove formula embedded part, fixed support and fixed hanger, and board groove formula embedded part part sets up in the concrete precast slab, and is outwardly extended with the mounting bolt, and the fixed support is connected in the mounting bolt and is locked through the nut, and the fixed hanger is connected in the side wall of fixed support, and the width direction interval of fixed hanger is equipped with first installation hole and second installation hole, and first installation hole is used to wear fixed bolt and connects fixed support, and second installation hole is used to wear fixed bolt and connects the installation stand, and the distance of fixed hanger relative to the concrete precast slab can be adjustable adjustment to adjust the position of installation stand.

The present disclosure relates to a method, system, device and medium for predicting the mechanical properties of magnetic composite materials, the method comprising the following steps: obtaining multiple basic parameters of the composite magnetic material to be predicted, and using a generalized self-consistent model to calculate the effective bulk modulus and effective shear modulus of equivalent particles of different particle sizes according to the multiple basic parameters of the composite magnetic material; according to the critical magnetic powder content, the thickness, volume fraction and elastic modulus of the interface layer are calculated by the interface layer parameter model; according to the parameters in the above calculation process, the effective elastic modulus of the magnetic composite material is calculated using a multiphase inclusion formula to achieve mechanical property prediction. The present disclosure can quickly obtain the mechanical property prediction of the magnetic composite material, avoiding the complicated and time-consuming material performance testing process, and can improve the mechanical properties of the material by regulating the material microstructure parameters, improving the design efficiency and saving the design cost.

The utility model relates to the field of measuring mechanisms, and particularly discloses a measuring mechanism for automatically measuring the height of UV glue, which comprises a main control computer, a conveying belt, a mounting bracket, an infrared sensor, a lifting mechanism and a digital display meter, the digital display meter comprises a telescopic measuring rod, and the lifting mechanism drives the digital display meter to lift. The measuring mechanism realizes automation, and the detection efficiency is high; after the lifting mechanism falls down, the measuring rod of the digital display measuring tool has a large lifting allowance, so that the error of the reciprocating motion of the lifting mechanism can be counteracted. When the measuring mechanism is installed, a corner connector used for hanging a digital display meter and a clamp used for clamping a pcb are designed. During specific measurement, the bottom of the measuring rod falls to the side of the uv glue coating position in advance, the spare position of the pcb is selected as a reference surface, when the pcb continues to advance, the uv glue coating position starts to support the measuring rod, then the measuring rod falls back, and the height of the uv glue coating position corresponding to the difference value of two height data is displayed.

The invention provides a gravitational acceleration measuring method based on a strapdown inertial navigation system, which comprises the following steps of: compensating a parameter error of an accelerometer by a two-position acquisition method; a 16-order FIR low-pass filter and a multi-channel three-parameter notch filter are combined to carry out noise reduction processing on data of the gyroscope and the accelerometer, so that the influence of environmental interference is reduced; and reversely resolving the gravitational acceleration by adopting an inertial navigation error equation to finally obtain the high-precision gravitational acceleration. The method is simple, convenient and easy to implement, low in cost and easy to popularize, the use environment is basically not limited, and the method can be applied to both the laboratory environment and the field severe environment; the gravitational acceleration measuring method disclosed by the invention has relatively strong anti-interference capability, and high-precision gravitational acceleration measurement under a complex working state is ensured.

The utility model discloses a plate type spare visual inspection module, including track board and two detection units, the detection unit includes two set up on the track board's light supplementing lamp, sets up the portal frame on the track board and two rotation connection on the portal frame's U type frame, the U type frame rotation connection has the camera in, be provided with two bending plate on the U type frame, be provided with second screw hole on the bending plate, second screw hole thread connection has second adjusting screw, two second adjusting screw's end part respectively with the both sides of camera are opposite. Camera can carry out horizontal and longitudinal translation adjustment and rotation adjustment, offset the error that appears in camera installation and use process, guarantee the accuracy of visual inspection. Through the axial sliding of first adjusting screw and second adjusting screw fine adjustment, enlarge the displacement of adjustment, thereby make fine adjustment more convenient and accurate.

This application provides a method and system for detecting antibiotic pollution in water bodies based on spectral characteristics, belonging to the field of water environment monitoring and analysis technology. First, this application simultaneously acquires the surface-enhanced Raman spectrum and redox potential time-series data of the water sample to be tested. Next, the ratio of the characteristic peak intensities of the target antibiotic is extracted from the spectrum to generate a first feature set. Simultaneously, wavelet packet decomposition is performed on the potential data, and energy entropy is calculated to construct a second feature set. Subsequently, the two feature sets are concatenated, and a mutual information maximization algorithm is used to filter out the target feature subset highly correlated with concentration. Finally, using a support vector projection regression model trained based on a structural risk minimization mechanism, and through kernel function mapping and hyperplane projection operations, the accurate detection of the target antibiotic concentration in the water sample is achieved. This application improves the anti-interference capability and quantitative accuracy of antibiotic detection in complex water body backgrounds.

The invention provides a relay contact performance analysis and test method. The relay contact performance analysis and test method comprises the steps that S1, a test host loads a preset test parameter template; s2, preparing a test fixture I and a test fixture II; s3, setting the state of a control relay K1; s4, setting the state of a control relay K2; s5, setting the state of a control relay K3; s6, installing a tested relay; s7, the test signal source injects a test signal; s8, a high-speed analog-to-digital converter collects a contact signal; s9, the test host integrates three algorithms to process the digital signals, and calculates and optimizes contact performance parameters; and S10, executing an electrical life test of the tested relay. The core of the invention is to realize full-automatic and high-precision testing of multiple parameters of the relay contact through cooperation of hardware configuration and an algorithm.

The present disclosure relates to the technical field of 3D printing, and aims to solve the problem of complex structure of existing printing equipment and inability to continuously produce. A kind of warehouse type electron beam 3D printing device and printing method are provided, the printing device includes rack and printing warehouse, the bottom of printing warehouse is provided with lower inclined surface connecting flange, the lower side of lower inclined surface connecting flange is provided with first guide rail assembly and jacking mechanism;The mobile plugboard assembly includes mobile lift truck and plugboard valve cavity, one end of plugboard valve cavity is provided with upper inclined surface connecting flange;The lifting end of mobile lift truck is provided with second guide rail assembly for butt joint with first guide rail assembly, multiple sliders at the bottom of plugboard valve cavity drive its radial translation, realize the sealed communication or separation of printing warehouse and plugboard valve cavity;Plugboard valve cavity is provided with plugboard valve mechanism and forming cylinder assembly, the bottom of forming cylinder assembly is provided with pneumatic assembly, pneumatic assembly and jacking mechanism are matched to drive forming cylinder assembly to lift along the axial direction.

The invention discloses a biphase step-down converter circuit and a current sharing method, and belongs to the technical field of step-down converter circuits. A level conversion circuit and a leading edge blanking circuit are additionally arranged on the basis of a traditional biphase step-down converter circuit; the level conversion circuit receives a first power level driving signal sampled from the first step-down converter and the second step-down converter, obtains a second power level driving signal after level conversion, and inputs the second power level driving signal to the leading edge blanking circuit; the leading edge blanking circuit receives a second power level driving signal and generates a first level signal, when the second power level driving signal jumps at a rising edge and a falling edge, the first level signal is in a first level state, and when the second power level driving signal does not jumps at the rising edge and the falling edge, the first level signal is in a second level state; and the first level signal is an enable signal for opening and closing the current balancing module. According to the invention, large-current burrs generated when the high-side power tube is switched on and switched off can be filtered, and the sampling accuracy is improved.

This invention relates to the field of spatial information data processing technology. It discloses a method and system for remote sensing intelligent identification and visualization management of airport airspace. The method includes acquiring remote sensing data of the airspace and facility occlusion data; firstly, constructing a data missing topology set to explicitly label local missing data caused by dynamic occlusion; then, performing three-dimensional topological reconstruction on the airspace remote sensing data to generate incomplete area prediction information; spatially filling boundary breaks; extracting boundary spatial coordinates based on the incomplete area prediction information; constructing an initial boundary model and calculating boundary consistency parameters based on the airspace remote sensing data; generating boundary consistency constraint information; optimizing the initial boundary model based on these constraints to obtain an optimized boundary model; and calculating the aircraft flight path safety distance in real time. This improves the real-time boundary monitoring accuracy of the airspace under conditions of occlusion and limited three-dimensional boundary structure consistency.