83results about How to "Avoid trial and error" patented technology

The invention relates to an analytical design method of a camber and a surface shape of an automobile plate spring, belonging to the field of automobile springs. According to the invention, the performances of a suspension are influenced by the camber and the surface shape of the plate spring, but an accurate design method for the camber and the surface shape is not provided. According to the performance requirements of the automobile suspension on the plate spring, the analytical design method of the camber and the surface shape of the automobile plate spring can be established by using elastic mechanical theory. The analytical design method of the camber and the surface shape of the automobile plate spring, provided by the invention, is simple and reliable, and requirements of precise design of the thickness of the automobile plate spring can be satisfied by utilizing the analytical design method. The analytical design method can be used for design of the vehicle suspension plate spring.

The invention discloses a method for predicting sheet forming fractures based on a damage fracture standard numerical value. The method includes the steps of obtaining the stress state distribution of a metal sheet cylindrical piece in the stamping process according to the thermodynamics irreversible law, obtaining a stress balance differential equation of the metal sheet cylindrical piece in the stamping process according to the stress state distribution, calculating the change rate, occurring when the metal sheet cylindrical piece is damaged, of the area of a small unit of the metal sheet cylindrical piece in the stamping process according to the continuum damage mechanics theory, obtaining the damage to the metal sheet cylindrical piece according to the change rate, calculating the relation between the damage and the strain of the metal sheet cylindrical piece, and finally deriving the relation between the damage value and the true stress, true strain and hydraulic stress of the metal sheet cylindrical piece under the unidimensional scale in the whole stamping process. By means of the method, the technical problem that when fractures during sheet forming are predicted through an existing numerical value method, errors are large can be solved.

The invention discloses a method for manufacturing 3D glass, which comprises the following steps: step 1, cutting a large glass base material into small pieces of glass with preset sizes; step 2, placing the small pieces of glass in a mold, bending and adhering the small pieces of glass on a concave surface of the mold by vacuum adsorption at a glass hot bending temperature after the small piecesof glass are softened to form a 3D glass blank; step 3, performing laser cutting on the 3D glass blank to form a 3D glass semi-finished product; step 4, performing CNC polishing and chamfering on the3D glass semi-finished product to obtain the 3D glass; step 5, performing sweeping treatment on the surface of the 3D glass.According to the method for manufacturing the 3D glass, the required 3D glass appearance is directly formed by forming the glass with reserved processing allowance and laser cutting the appearance after forming, so that the development process of reverse derivation and repeated tests is avoided, the development difficulty of large-angle new products is reduced, the development period is shortened, the product yield is improved, and the cost is reduced.

The invention discloses an internal-model-based sliding mode control method capable of inhibiting mismatching disturbance of a permanent magnet linear motor. The internal-model-based sliding mode control method includes the steps that a five-phase fault-tolerant permanent magnet cylindrical linear motor model with mismatching disturbance is set up; an internal model controller of an ideal system is designed by adopting an internal model control strategy; based on the motor second-order mathematic model, mismatching disturbance observers are designed to observe mismatching disturbance of a motor system; two kinds of mismatching-disturbance-based observers are designed, the sliding mode control rules (the symbol is shown in the description) of the system under the two methods are solved; the expression (the symbol is shown in the description) is equivalently transformed to contain system mismatching disturbance errors, the Lyapunov function is selected, and the obtained sliding mode control rules (the symbol is shown in the description), a d-axis voltage set value (the symbol is shown in the description), an x-axis voltage set value (the symbol is shown in the description) and a y-axis voltage set value (the symbol is shown in the description) are used for achieving high-performance operation of the internal-model-based sliding mode control system capable of inhibiting mismatching disturbance of the fault-tolerant permanent magnet cylindrical linear motor by means of a voltage source inverter through a CPWM modulation method, wherein the d-axis voltage set value, the x-axis voltage set value and the y-axis voltage set value are output by a PI current regulator.

The invention provides an alternating-current receiving end grid direct-current receiving scale calculation method. The method comprises the following steps: 1, a set L1 in which the short-circuit current level satisfies set conditions is obtained; 2, a bus set L2 in which the influences of the disconnection of an alternating-current circuit connected with some bus on direct-current system MISCR are less than set influences is screened out; 3, an intersection set L of the set L1 and the set L2 is obtained; 4, any i buses are selected from the set L so as to be fed into the direct-current system, and each direct-current MISCR value in the optimal scheme is judged whether to be less than the minimum limit value, if each direct-current MISCR value in the optimal scheme is less than the minimum limit value, then the process enters the step 5, or else the process enters the step 7; 5, the direct-current system maximum power value which can be accepted on the i direct-current fall point buses is calculated in the condition that the MISCR value of the direct-current system is not less than the minimum limit value and the direct-current power does not exceed the maximum power limit value; 6, i=i+1, and when i is judged to exceed the total number of elements, the step 7 is executed, or else, the step 4 is executed; 7, and the alternating-current receiving end grid direct-current receiving scale is obtained. The calculation method provided in the invention has advantages of simplicity and good operability, and a direct guidance scheme can be provided for planners.

The invention discloses an FOA-RBF based high-voltage circuit breaker fault diagnosis method, which comprises the steps of according to the waveform, which varies along with the time, of closing current of a high-voltage circuit breaker, extracting feature variables, and selecting 24 groups of typical data to act as a feature variable sample; performing pretreatment and normalization on the feature variable sample, carrying out binary coding on six groups of diagnosis types, performing iterative optimization on a spreading parameter spread of an RBF network in the global scope, reserving an optimal spread value, and building an FOA-RBF based fault diagnosis model; selecting sample feature variables to act as input of an FOA-RBF network, enabling the six groups of diagnosis types to act as output of the FOA-RBF neural network, and performing high-voltage circuit breaker fault diagnosis. According to the FOA-RBF based high-voltage circuit breaker fault diagnosis method, an artificial intelligence method of FOA-RBF is applied to fault diagnosis for the high-voltage circuit breaker, and quick and effective detection can be performed on a fault.

The invention discloses a tester and method for obtaining plane limiting strain of a differential tailor welding blank; the method comprises the following steps: a splint mechanism consisting of an upper clip and a sectional lower clip, a welding blank tensile sample is positioned between the upper clip and the sectional lower clip; a height adjusting sheet is arranged between sectional lower clip and a base, the sectional lower clip and the height adjusting sheet are fixed on the base, a sliding block is arranged between the upper clip and a top pressing plate, the upper clip and the sliding block are fixedly connected by adopting a bolt passing through the middle of the top pressing plate, the tester is arranged in a conventional plate tensile test machine for uniaxial tension test and the limiting strain value is measured; the tester and method of the invention can obtain better plane strain state, have stable test result, simple structure, low test cost, simple and convenient operation, and high test efficiency and the sample is flat after the test.

The invention relates to an intensity checking method of overlaying valve plates of a compression valve of a vehicle buffer, and belongs to the technical field of hydraulic buffers. At present, a reliable calculation method for checking the maximum stress and intensity of the overlaying valve plates of the compression valve is not given at home and aboard, the checking is conducted through numerical simulation by finite element software most of the time, and therefore modern design requirements of the buffers can not be satisfied. The intensity checking method is characterized in that checking of the intensity of the overlaying valve plates of the compression valve is conducted according to the thicknesses, the number of pieces, the allowable stress and the maximum stress of the overlaying valve plates of the compression valve. According to the intensity checking method, not only influences of normal open holes of a rebuilt valve, piston gaps and a circulation valve are considered, but also the stress condition of actual non uniform pressure is considered. The intensity checking method of the overlaying valve plates of the compression valve of the vehicle buffer is capable of calculating the maximum stress of the overlaying valve plates of the compression valve accurately, checking the intensity reliably, guaranteeing the design service life of the buffer, reducing maintenance cost, avoiding repeated testing and modification, reducing the cost of designing and testing, and shortening the development cycle.

The embodiment of the invention provides a cantilever crane end position control method and system, and a construction machine. The method comprises the following steps that: a direction and an amplitude that are indicated by a control mechanism for controlling the position of the tail end of a cantilever crane are received; an actual speed and position of the tail end of the cantilever crane arereceived; according to the direction and amplitude, the actual speed of the tail end of the cantilever crane, an accelerated speed upper limit constraint and/or speed upper limit constraint, a desiredmovement speed of the tail end of the cantilever crane under the accelerated speed upper limit constraint and/or speed upper limit constraint is determined; according to the lasting time of the indication direction and amplitude of the control mechanism, integration of the desired movement speed is carried out to obtain a displacement increment of the tail end of the cantilever crane is obtained;on the basis of the displacement increment and the actual position of the tail end of the cantilever crane, a target position of the tail end of the cantilever crane is determined; and a driving mechanism of the cantilever crane is controlled, so that the tail end of the cantilever crane moves to the target position. Therefore, the operator can control the position of the tail end of the cantilever crane directly without the need to control the position of the tail end of the cantilever crane by controlling each joint of the cantilever crane.

The invention provides a test device for measuring and simulating a brake hose, which belongs to the technical field of vehicles and aims at solving the problem of how to simulate the mounting environment of the brake hose in a real vehicle. The test device comprises a frame body; two mutually-parallel and parallelly-arranged X scale guide rods are fixed on the frame body; at least two Y scale guide rods are connected between the two X scale guide rods in a sliding mode; the Y scale guide rods are vertical with the above two X scale guide rods; Z scale guide rods arranged along the vertical direction and vertical with the Y scale guide rods are connected in a sliding mode onto the Y scale guide rods; and a hose clamping device for clamping and fixing the brake hose and capable of adjusting the mounting angle of the brake hose is connected in a sliding mode onto the Z scale guide rods. The test device can simulate the mounting position and the mounting angle of the brake hose in the real vehicle, the brake hose sample can be prevented from being changed repeated for assembly verification in a vehicle loading stage, the development period of the brake pipeline is shortened, and teh development cost is reduced.

The embodiment of the invention provides a search recommendation method and device, electronic equipment and a readable storage medium, and the method comprises the steps: responding to a query request, and obtaining query information carried in the query request and user information and store information corresponding to the query information; recalling a candidate information set based on the query information, the user information and the store information; and sorting the candidate information in the candidate information set to obtain a return result corresponding to the query request. According to the embodiment of the invention, the search efficiency can be improved, the user search operation process is simplified, and the user experience is improved.

The invention relates to the technical field of artificial intelligence, and discloses a color filling method and device, equipment and a storage medium, and the method comprises the steps: receiving a template picture, and extracting a plurality of reference colors; obtaining a first pixel value of each reference color in the template picture; identifying filling areas in a target picture, and calculating an area ratio value of each filling area to the target picture; judging whether the area proportion value of the filling area is smaller than a preset proportion threshold value or not, wherein the filling area with the area proportion value smaller than the proportion threshold value serves as a foreground area; obtaining a corresponding relation between the reference colors and the foreground areas according to the first pixel values of the reference colors and the area proportion value of the foreground areas and the target picture, and filling the corresponding foreground areas with the reference colors according to the corresponding relation; the automatic selection of the filling color is realized, so that the color matching design efficiency of the picture is improved.

The invention discloses a method for sending a message. The embodiment of the invention also provides a device and a system for sending a message. A message sender of the technical scheme can obtain the information of a client terminal, select a carrying way according to the information and send the message to the client terminal, thereby preventing the condition of multi-inquiry or sending failure caused by the mismatching between the designated carrying way and the practical information of the client terminal, saving the signaling flux and improving the success rate for sending the message.

The embodiment of the invention provides a method and system for control over the position of the tail end of a cantilever crane and an engineering machine with the system. The method includes the steps that the direction and magnitude indicated by a control mechanism used for controlling the position of the tail end of the cantilever crane are received; the actual speed and position of the tail end of the cantilever crane are received; according to the direction and magnitude and the actual speed and actual position of the tail end of the cantilever crane, the target position of the tail endof the cantilever crane is determined; according to the target position of the tail end of the cantilever crane, a set of target joint positions are worked out through inverse solution; a set of target joint speeds are calculated; a driving mechanism of the cantilever crane is controlled so that one or more joints of the cantilever crane can meet the target joint positions and target joint speedsrespectively. In the scheme, an operator can directly control the position of the tail end of the cantilever crane, and it is not needed to separately control each joint of the cantilever crane to control the position of the tail end of the cantilever crane.

The invention provides a dissimilar material brazing gap control method and system. The dissimilar material brazing gap control method comprises the steps of: presetting assembly gap values according to the actual structures of all workpieces to be assembled; determining performance parameters of all the workpieces; according to the brazing structures of all the workpieces and the brazing filler metal joint filling requirements, determining the positions of brazing seams and the boundary conditions of thermal structure analysis; according to the boundary conditions of thermal structure analysis and the performance parameters of all the workpieces, analyzing thermal displacement changes of all the workpieces, and working out brazing gap values among all the workpieces; performing comparison and re-calculation according to the brazing gap values among all the workpieces and a preset brazing gap range of a brazing material to obtain an optimal assembly gap range among the workpieces; and performing a process test according to the optimal assembly gap range to determine the actual assembly gap among the workpieces. According to the method, the initial assembly gap of the workpieces and the brazing gap are linked through simulation analysis, so that numerical control over the brazing gap of the dissimilar materials is achieved, and the brazing quality of products is guaranteed.

The invention discloses a spliced mechanical coded lock. The spliced mechanical coded lock comprises a lock body, a lock plate, a plurality of lock keys and a plurality of jigsaw keys, wherein the lock plate is inserted into the lock body, the lock plate is provided with a plurality of movable grooves, the plurality of lock keys are movably connected to the movable grooves in a penetrating mode, the lock keys are provided with clamping grooves, when all the clamping grooves are flush with the movable grooves, the lock plate can move in the lock body, and the jigsaw keys are detachably arrangedat the upper end and the lower end of the lock body and abut against the corresponding lock keys to move so as to switch the moving or locking state of the lock plate. According to the spliced mechanical coded lock, the jigsaw pieces are different in shape and have more than 70 shapes, due to the fact that the lengths of stand columns on the jigsaw pieces are different, the spliced pieces can bespliced to form more than millions of combination styles, millions of keys can be formed after the stand columns are combined, even if other people accidentally obtain the spliced pieces, correct graphs and correct stand column arrangement modes are difficult to splice, the combination transformability of the password sets is higher, and the safety degree is higher.

The invention provides an LC filter parameter visualization design method of an energy storage converter. The LC filter parameter visualization design method comprises the steps of S1, drawing a selection range of inductance parameters; S2, drawing a selection range of capacitance parameters; S3, drawing a selection range of cut-off frequency parameters; S4, designing LC filter parameters in combination with inductance, capacitance and cut-off frequency parameter selection ranges; S5, drawing a selection range of the direct-current side voltage; S6, verifying whether the LC filter parameters meet the design requirements or not, if not, returning to the S1 for redesign, and if yes, executing the step S7, and outputting final LC filter parameter values. Parameter design is carried out in a visual mode, parameter selectable areas and change trends can be visually obtained by drawing selectable areas of inductance, capacitance and cut-off frequency parameters, repeated trial and error areavoided, and multiple design indexes such as system cut-off frequency, reactive power, full-load voltage drop and four-quadrant operation can be met at the same time.

The invention discloses a vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree, comprising the following steps of: firstly, establishing a state transition graph when composite power supplies with four different topology structures comprising a cascaded structure composite power supply with a super capacitor located in an intermediate position,a cascaded structure composite power supply with a storage battery located in the intermediate position, a parallel connection structure composite power supply and a multi-input power converter structure composite power supply break down based on Markov chain theory; secondly, according to the state transition graph when the composite power supplies with four different topology structures break down, establishing a fault tree model graph which finally makes the composite power supply break down and the system be in a state of paralysis based on the fault tree theory; finally, according to theestablished fault tree model graph, calculating break down rate of the composite power supplies with four different topology structures, performing comparative analysis, and performing reliability evaluation, so as to obtain a composite power supply with the strongest reliability, and repeated tests in engineering practice are avoided.

The invention discloses a signal modulation identification method of a complex valued neural network based on a structure optimization algorithm. The method comprises the following steps: initializing the structure and parameters of a forward complex valued neural network; adjusting parameters in the complex-valued neural network by using a complex-valued structure optimization algorithm, verifying the generalization performance of the forward complex-valued neural network, storing the number of current hidden layer neurons and all parameter values of the forward complex-valued neural network, and judging whether training is trapped in a local minimum point or not; if yes, adding a hidden layer neuron to the current model by using a complex value increment construction algorithm, calculating a weight of a newly added neuron, a hidden layer output matrix and a loss function value on the basis of current training, and continuing to train a new model; if not, keeping the model structure unchanged, and continuing training until an algorithm stopping condition is met. According to the method, the forward complex value neural network model with the optimal structure can be adaptively constructed, the method is used for identifying the communication signal modulation mode, and a satisfactory effect is achieved.

The invention provides a commutator overspeed performance simulation calculation method. According to the method, fracture mechanics is introduced in an extended finite element method, so that a commutator overspeed fracture process is simulated in finite element software. The method comprises the steps of performing a fracture mechanics test on a commutator material, obtaining fracture performance parameters, introducing fracture mechanics parameters in finite element analysis through a bilinear stress softening curve model, building a finite element model by utilizing Abaqus finite element software to simulate a commutator overspeed fracture destruction process and the like. The method adopts finite element simulation analysis and has the advantages of high speed, low cost, good observability and the like; the material fracture parameters are obtained through the fracture test and applied to the finite element analysis, so that the commutator overspeed destruction process is simulated; and stress field changes of all parts in the commutator overspeed destruction process can be obtained in a development stage, and theoretical estimation is finished before trial production of a product, so that repeated sample trial production processes are avoided, the development cost is reduced, and the development cycle is shortened.