75results about How to "Solving Design Difficulties" patented technology

The invention relates to a spinning forming core mold device and a method of multi-functional complex longitudinal and transverse inner rib cylindrical components. Each combined core mold comprises anactive core mold and a passive core mold; and the transverse core molds are circular rings with bosses on the inner sides. The combined core molds acts independently, so that the combined core moldscan be formed without rib barrel-shaped components; the combined core molds and the transverse core molds are matched, and cylindrical components with transverse inner ribs can be formed; the combinedcore molds and the longitudinal core molds are matched, and cylindrical components with longitudinal inner ribs can be formed; and the combined core mold and the transverse core mold, the longitudinal core molds and the longitudinal core molds are matched, and cylindrical components with complex longitudinal and horizontal inner ribs can be formed. According to the spinning forming core mold device, the forming of the ribbed components and non-ribbed components with different types is realized; the transverse core molds are adjusted., the thicknesses of the longitudinal core molds are equal to the thicknesses of the longitudinal core molds, and the forming of the cylindrical components with different ribs and high longitudinal and transverse inner ribs is realized; and the device can effectively solve the problems that the core molds of the cylindrical spinning forming components with the longitudinal and transverse ribs are difficult to machine and demold, and has the characteristicsof being easy to machine and assemble, convenient to detach, multifunctional and the like.

The invention discloses a flexible spacecraft active fault tolerant control method based on dynamic output feedback control, which belongs to the field of spacecraft attitude control. The method comprises the steps that a dynamic equation of a flexible spacecraft attitude control system is transformed into a general state space equation; a fault model with additive sensor measurement offset is established; a fault detection and identification module composed of an unknown input observer and a filter is established; real-time detection and on-line estimation are carried out on unknown sensor fault; and a fault tolerant controller based on dynamic output feedback is designed based on acquired fault estimation information. According to the invention, when a flexible spacecraft can normally reach an expected posture in the case of an additive sensor measurement offset fault; the influence of disturbance generated by modeling uncertainty and flexible accessory is considered in a design process; and a fault diagnosis and identification module and the fault tolerant controller can be independently designed, and can be easily realized by a project.

Relating to a single-axis rotation rapid calibration technology based on fiber-optic gyro inertial navigation, the invention puts forward a single-axis rotation rapid calibration method. The method includes: firstly establishing an inertial device input-output model according to the input-output relationship of a gyro and an accelerometer, then providing a state equation and an observation equation of Kalman filter, letting a rotary table start rotation around a single axis, estimating system error parameters according to the established Kalman filter equations, and exciting part parameters associated with the axis, after completing the calibration process of the first axis, enabling the rotary table to complete rotation calibration of the other two axes successively in the same way, and finally, analyzing the calibration output result to complete all calibration, and updating the system error parameters. Although that not all system error parameters are estimated, relevant parameters of different axes are calibrated in order, the accuracy of the final result can be guaranteed, a fast convergence speed can be achieved, and the calibration time is greatly shortened.

An ultra violet radiation resistant environmental protection sheathing material is mainly prepared by the following materials according to the parts by weight: 40-50 pars of polyvinyl chloride resin, 6-8 parts of trioctyl trimellitate, 4-6 parts of dioctyl sebacate, 7-9 parts of dioctylphthalate, 4-6 parts of ca-zn composite stabilizer, 1-1.5 parts of epoxidized soybean oil, 1-1.5 parts of diantimony trioxide, 1-1.5 parts of diantimony trioxide, 10-13 parts of magnesium hydrate, 8-10 parts of refined calcium carbonate, 8-10 parts of titanium dioxide, and 0.3-0.5 parts of ultraviolet absorbent. The invention technically solves the difficult point of compound formulation of the ultra violet radiation resistant white sheathing material, greatly increases the resistance to ultra violet radiation performance of the product, has strong practicability and lays the material foundation for the design and development of resistance to ultra violet radiation coaxial-cables. Based on the resistance to ultra violet radiation white polyvinyl chloride sheathing material, the resistance to ultra violet radiation environmental protection sheathing material technically solves the technical difficulties of resistance to ultra violet radiation performance, softness, UL mechanical physical property, ROHS environment requirements and the like which are difficult to be achieved completely, meets the strict requirements of the application of products on tropical and subtropical regions and has remarkable social effect.

The invention discloses an intrinsic image decomposition method and device based on deep learning. The method comprises that a 3D model is selected from multiple 3D models and loaded with a physics based renderer, illumination is set randomly, an image is rendered at a random visual angle, the renderer obtains corresponding reflection and illumination components, and above operations are repeatedto generate a large batch of data sets with marked intrinsic image decomposition; a full convolutional neural network is trained into an intrinsic image decomposition network via the generated data sets; and the intrinsic image decomposition network is used, and a decomposition target of expected output is obtained from a decomposition result of predicted output. Via the intrinsic image decomposition method, a large batch of marked data sets is obtained in an image rendering manner, the deep neural network is trained to obtain a decomposition model of high robustness, and the loss network is used to further improve the generalization performance and avoid difficulty in design of the loss function.

The invention provides a single-phase phase-locked loop optimization design method with a harmonic suppression function. The invention has the improvement that the design method comprises the steps of: firstly, establishing a single-phase phase-locked loop small-signal model, carrying out equivalent processing on the small-signal model to form a one-order inertial element and a proportional element, and establishing a complete single-phase phase-locked loop small-signal model; secondly, designing a control parameter of a single-phase phase-locked loop, and solving a value range of the control parameter by using an open-loop transfer function and an error transfer function of the single-phase phase-locked loop small-signal model as target functions and using single-phase phase-locked loop dynamic characteristics as constraint conditions; and finally, according to a transfer function of an interference signal, optimizing the control parameter of the single-phase phase-locked loop. The design method provided by the invention is applicable to different single-phase phase-locked loops, can be directly applied to application environments with different requirements for the harmonic suppression function, and is convenient to evaluate advantages and disadvantages of performances of different single-phase phase-locked loops.

The invention discloses a sea surface small target detection method based on a random forest. The method comprises the following steps of: acquiring an echo vector of a distance unit to be detected and an echo vector of a surrounding reference distance unit; extracting multi-dimensional features in a time domain, a frequency domain and a time-frequency domain; constructing a high-dimensional feature vector; performing normalization processing on the feature vector; extracting a normalized feature vector according to simulated target-containing echo data and sea clutter data, and constructing two types of balanced training samples; taking the two types of training samples as input of the random forest, establishing a mathematical function expression between a splitting factor and a false alarm rate, and obtaining a false alarm controllable random forest two-classifier; and substituting the normalized feature vector into the random forest two-classifier to obtain an output classificationlabel, and judging whether a target exists in the echo vector or not. According to the invention, the detection performance of the radar under the low SCR condition can be improved, the difficulty ofdesigning the false alarm controllable two-classifier in the high-dimensional feature domain is solved, and a new idea is provided for sea surface small target detection.

The invention discloses a foldable F-inverted and annular combined multi-frequency-range communication antenna. The antenna comprises an antenna body which is at least one conductor subcircuit and is provided with a grounding point and a feeding point; on the antenna body, a first branch and a second branch are formed based on the feeding point as an initial end, and a third branch is formed based on the grounding point as an initial end; and the second branch is connected with the tail end of the third branch to form a semi-close first gap, the first branch and the second branch form a semi-close second gap, the joint part of the second branch and the third branch and the tail end of the first branch form a third gap, and the antenna body is also provided with a fourth branch which is generated on the initial end of the third branch. The antenna has the advantages of simple structure, good electrical energy and the like.

The invention discloses a multi-unmanned aerial vehicle cooperative attack and defense confrontation method based on a strategy set MADDPG. The method comprises the following steps: firstly, constructing a multi-unmanned aerial vehicle cooperative attack and defense confrontation combat mission environment; secondly, establishing a combined state space and a combined action space of the multi-unmanned aerial vehicle system; then, designing a reward function based on a group target for the multi-unmanned aerial vehicle attack and defense confrontation problem, wherein the reward function comprises two parts, namely, an attack-party unmanned aerial vehicle and a defense-party unmanned aerial vehicle; thirdly, training the network based on the strategy set MADDPG; and finally, realizing a multi-unmanned aerial vehicle cooperative attack and defense confrontation decision by using the trained network model. According to the method, the MADDPG algorithm is improved, the reward function based on a group target is designed, learning of a cooperative attack and defense strategy is guided, the problem that a single agent in a multi-unmanned aerial vehicle system has a strong over-fitting strategy for competitors of the agent is effectively solved by using a strategy set, the attack and defense efficiency is higher, therefore, the unmanned aerial vehicle is endowed with a better cooperative attack and defense confrontation capability.

The invention relates to a pre-impregnated material for a circuit board. The pre-impregnated material comprises a pre-impregnated core material layer and an outer resin layer formed on at least one side of the pre-impregnated core material layer, wherein the pre-impregnated core material layer comprises a reinforcing material and an inner resin layer coating the outer side of the reinforcing material; the dielectric constant of the outer resin layer is denoted as Dk<outside> and the thickness is denoted as H<outside>; the dielectric constant of the pre-impregnated core material layer is denoted as Dk<core> and the thickness is denoted as H<core>; and the dielectric constant Dk<laminated board> of the laminated board meets the condition as follows: Dk< pre-impregnated material>=(Dk<core>*H<core>+Dk<outside>*H<outside>)/(H<core>+H<outside>). The Dk value of the laminated board is calculated according to weight of the thickness and the differences between the pre-impregnated core material layer and the outer resin layer in Dk and thickness, the design problem of the Dk of the laminated board is achieved, the design range of the Dk of the laminated board is not limited to Dk of the reinforcing material, and the problem that a PCB is difficult to design is solved.

The invention discloses a thermal power plant primary fan fault early warning method based on an auto-encoder, and the method comprises the following steps: S1, selecting data of a fan during normal operation in a whole data set, and dividing the data into a training set, a verification set and a test set; S2, performing normalization processing on the measurement value of each measurement point according to the maximum values and the minimum values of the training set, the verification set and the test set; S3, establishing an auto-encoder model and carrying out model training; S4, calculating a test residual error between an output value and an input value of the auto-encoder model of the test set; S5, performing rolling calculation of a mean value and a standard deviation on the test set data residual error, and determining a threshold value; and S6, calculating a residual error of the fan operation real-time data by utilizing the auto-encoder model, comparing the residual error with a threshold value to determine an equipment state, and carrying out early warning according to the equipment state.

The invention provides an automobile steering knuckle as well as a steering knuckle positioning and fastening device. The automobile steering knuckle comprises a steering knuckle body in which a steering shaft hole is formed, wherein a first positioning part, a second positioning part and a third positioning part which are arranged in a triangular shape are formed on the steering knuckle body; the first positioning part and the second positioning part are clamping and fixing parts which are formed on the steering knuckle body and can be connected with an external mechanism in a clamping manner; one of the clamping and fixing parts is in a strip shape; and the third positioning part can be abutted and connected with the external mechanism. The invention also provides a steering knuckle positioning and fastening device for positioning and fastening the automobile steering knuckle. According to the automobile steering knuckle disclosed by the invention, complete positioning of the steering knuckle can be achieved by the arrangement of the first positioning part, the second positioning part and the third positioning part to guarantee stable positioning and fastening of the steering knuckle; and besides, the structure of a steering knuckle positioning and fastening fixture can be simplified, so that the problems that the design is difficult and collision accidents are easy to occur caused by complicated structure of the fixture can be solved, and the automobile steering knuckle is good in practicability.

The invention discloses a charge pump and voltage controlled-oscillator-based oversampling analog-digital converter. The charge pump and voltage controlled-oscillator-based oversampling analog-digital converter comprises a first asynchronous pulse width modulator, a charge pump, a second asynchronous pulse width modulator, a voltage-controlled oscillator quantizer and a analog-digital converter, wherein the first asynchronous pulse width modulator, the charge pump, the second asynchronous pulse width modulator and the voltage-controlled oscillator quantizer are sequentially connected with a forward-direction channel, and the analog-digital converter is connected with a feedback channel; analog signals converted by the analog-digital converter are subtracted from the output signals of the first asynchronous pulse width modulator and the output signals of the charge pump respectively, so that error signals can be obtained and are transmitted to the charge pump and the second asynchronous pulse width modulator, and therefore, a closed loop system can be formed. According to the charge pump and voltage controlled-oscillator-based oversampling analog-digital converter, a simple and low-power consumption structure is adopted to replace a complexly-structured and high-power consumption analog integrator, and higher accuracy can be obtained.

The invention provides a safety airbag device for a vehicle, and relates to the vehicle. The safety airbag device is mounted on a ceiling of the vehicle, and comprises an airbag; the airbag has a folded state and an unfolded state; when the vehicle is not collided, the airbag is folded on the ceiling; when the vehicle is suffered from side collision, the airbag can be unfolded; the airbag is placed between side-by-side passengers after being unfolded so as to protect a passenger on the far side during the side collision. When inertia force generated by the side collision enables the passenger far away from the collision side to incline to the collision side drastically, the airbag can be placed between the side-by-side passengers after being unfolded, so that a distant passenger can lean against the airbag; therefore, the effect of buffering collision inertia force is achieved, and the effect of protecting the distant passenger is achieved.

The invention discloses automatic equipment for welding a U-shaped hoop and a flat head pin and a welding method of the automatic equipment. The equipment comprises a feeding device, a discharging device and a four-station rotary workbench; the feeding device comprises a U-shaped hoop feeding device and a flat head pin feeding device, and the U-shaped hoop feeding device and the flat head pin feeding device are used for sorting and conveying U-shaped hoops and flat head pins respectively; the discharging device is used for collecting the welded U-shaped hoop and the flat head pin; and the U-shaped hoop feeding device, the flat head pin feeding device, the discharging device and a welding machine are arranged on the four sides of the four-station rotary workbench respectively to form four stations, and the four-station rotary workbench is used for achieving conversion of the four stations. According to the automatic equipment, automatic feeding, assembling, welding and discharging of the U-shaped hoop and the flat head pin within a short time are realized, the production capacity of the whole assembling production line is greatly improved, the labor cost is reduced, and the automation degree and the intelligent degree are obviously improved.

The invention relates to the technical field of vibrating tables, and discloses an induction-type vibrating table and a fixing method for a drive coil thereof. The vibrating table comprises a vibrating table body, and the vibrating table body comprises a drive assembly, a motion assembly cooperating with the drive assembly, an excitation assembly for forming a static magnetic field, and a pole plate assembly for forming a closed space. An inner drive coil of the drive assembly and a central magnetic pole are solidified under the high temperature to form an integrated structure. An outer drive coil and a magnetic ring lining are solidified under the high temperature to form an integrated structure, and are disposed at an inner side of a magnetic ring. According to the invention, the outer and inner drive rings are fixed in a solidified manner, thereby improving the fixing effect of the inner and outer drive rings. Meanwhile, the magnetic ring lining can form a protection layer of the outer drive coil, and protects the outer drive coil from being worn.

The invention provides a satellite-borne terahertz radiometer receiver; the satellite-borne terahertz radiometer receiver comprises a frequency mixer, a low-noise amplifier, an electrically controlledattenuator, an intermediate frequency amplifier, a filter, a detector, a direct-current amplifier and a low-pass filter which are sequentially coupled, wherein the frequency mixer is used for receiving a noise signal and carrying out down-conversion; the low-noise amplifier is used for amplifying a received low noise of an intermediate-frequency link; the electrically controlled attenuator is used for adjusting the gain of a receiver chain; the intermediate frequency amplifier is used for amplifying the amplitude of the intermediate frequency signal; the filter is used for controlling the noise bandwidth in the channel of the receiver; the detector is used for detecting the power of the channel of the receiver; the direct-current amplifier is used for conducting direct-current amplification on a detection voltage; and the low-pass filter is used for filtering out noise components in the direct-current voltage. The satellite-borne terahertz radiometer receiver can achieve relatively high sensitivity and linearity, and meanwhile, the satellite-borne terahertz radiometer receiver has high stability.

The invention provides an intelligent sampling and detecting system with fault accommodation function. The system comprises following steps: a. a continuous linear time invariant system model comprising actuator faults and disturbance is constructed; b. an adaptive fault diagnosis observer is designed according to the continuous linear time invariant system model in step a and an error equation is constructed; c. fault and status estimation information is obtained by use of the adaptive fault diagnosis observer in step b, and according to the fault and status estimation information, an optimal output status feedback fault-tolerant controller is further designed according to the fault and status estimation information; d. non-uniform sampling data fault-tolerant control rate is designed, and a minimum sampling interval of the non-uniform sampling data is determined; e. by use of the intelligent sampling system, sampling time is obtained, the status index is guaranteed stable even if inputting in a fault system. By use of the system, accurate and timely estimation of fixed value fault can be realized, and system stability is guaranteed by use of as little sampling output as possible.

The invention provides a separation-type underwater small-platform acoustic fuze system and a detection method. The system is formed by a detection module, an awakening module and an on-duty module. The awakening module and the detection module are integrated together. The on-duty module is integrated on a platform. The on-duty module and the detection module are separated physically. The detection module is responsible for carrying out passive detection on a water surface target and determining a target orientation and a distance. According to a detection result, an underwater acoustic communication on-duty and awakening mechanism is used to awaken the platform in an on-duty state so as to trigger the safety and protection measures of the platform. In the invention, an integrated acousticfuze system is not limited by a platform space size, power consumption, a profile and the like; and problems that the acoustic fuze system is difficult to design and a practical application effect ispoor are solved.

The invention provides a three-stand-column floating platform. The three-stand-column floating platform comprises a floating box, three stand columns, a truss structure, an upper deck and a lower deck, wherein the floating box is constructed in the mode that the cross section is triangular in general, and a through hole penetrating through in the longitudinal direction is formed in the middle of the floating box; the three stand columns are in parallel and arranged on the outer side of the floating box at equal intervals, the lower portions of the three stand columns are connected with the floating box; the truss structure is arranged on the three stand columns, and is a double-layer structure in the mode that an upper truss and a lower truss are jointed through connecting rods, projection of the lower truss in the horizontal direction is triangular in general, and the lower truss is connected with the upper ends of the stand columns; the platform device is arranged on the upper deck and the lower deck. According to the three-stand-column floating platform of the embodiment, the special truss structure is adopted, and on the premise that the whole strength requirement of the three-stand-column floating platform is met, the weight of the whole platform structure is greatly decreased, arrangement of the device is considered at the same time, and the strength and the use efficiency of the deck structure can be quite effectively improved.

The invention provides a multi-band antenna and a smart watch employing the multi-band antenna. The multi-band antenna comprises a radiation part, a grounding point and a feeding point, wherein the grounding point and the feeding point are connected to the radiation part separately; the radiation part comprises a first radiation part extending outside from the feeding point, a second radiation part connected to the first radiation part and a third radiation part; and the third radiation part is parasitized from the first radiation part or the second radiation part and is connected to the grounding point. The smart watch can be compatible with the multi-band antenna for 2G/3G communication in a limited space design; a user can communicate and access the Internet in real time; the measures of reducing radiation to a human body are taken into account by employing the routing layout of the antenna; and the requirements of a product on electromagnetic radiation SAR to the human body are met while the user experience is improved.

The invention provides a wireless data transmission method, which comprises the following steps of: copying service data to be sent to obtain at least two pieces of service data; Respectively sendingthe at least two pieces of service data through M transmission channels; And enabling the receiving end to receive the sent data in the N channels and recover the original service data, wherein N is an integer greater than 2. The invention also provides a corresponding wireless data transmission system. According to the method, the system design difficulty supporting high reliability and low timedelay is solved, the reliability index of the service is improved through flexible system frame structure design, flexible frame configuration and multi-channel transmission strategy combination.