19results about How to "Optimize geometry" patented technology

The invention discloses a machine learning optimization method of a low-frequency sound absorption structure based on three-dimensional printing, and belongs to the technical field of artificial intelligence acoustics, the low-frequency sound absorption structure is prepared from a photosensitive resin material through photocuring three-dimensional printing, and comprises a side seam, an extension cavity, a circular through hole, a resonance cavity, a first partition plate, a second partition plate and a third partition plate, the method has good expansibility and can be adjusted according to different noise control requirements; through a machine learning optimization method, structure parameters can be quickly adjusted to cope with a noise control task on the premise of ensuring a small size, so that a remarkable sound absorption effect is obtained at a specific low-frequency band; according to the method, a machine learning method based on a multi-layer perceptron and a genetic algorithm is adopted, geometric parameters of the low-frequency sound absorption structure are optimized, simulation calculation is carried out by using a commercial finite element solver COMSOL Multiphysics, and the sound absorption performance of the structure is further verified and optimized.

The invention provides a unit cell structure design method and device based on nickel-titanium shape memory alloy, and relates to the technical field of intelligent materials and structures.The method includes the steps that relevant characteristic parameters of nickel-titanium alloy are collected, a mechanical property index, a thermal stability index and a reliability index are generated, and then a phase change temperature index is obtained through comprehensive calculation; and the phase change temperature threshold is corrected, the geometrical shape and the bonding mode of the unit cell structure are determined, and the quasi-zero-stiffness curved beam, the supporting frame and the connecting part of the unit cell structure are optimally designed in combination with the corrected phase change temperature threshold. According to the method, through characteristic parameter pretreatment, mechanical property index calculation and unit cell structure geometric optimization of the nickel-titanium shape memory alloy, the excellent performance under different phase change states is achieved, and the buffering energy absorption and low-frequency vibration isolation functions of the alloy are improved.

This invention provides a pre-rotating air inlet ring, a centrifugal fan, and a range hood, belonging to the field of kitchen appliance technology. The pre-rotating air inlet ring includes an outer fixed ring, an inner fixed ring, and multiple blades; the outer and inner fixed rings are concentric and coaxially arranged; multiple blades are distributed between the outer and inner fixed rings, with the inner end of each blade fixedly connected to the inner fixed ring and the outer end fixedly connected to the outer fixed ring; the extension direction of the blades forms an acute angle with the perpendicular line to the axis of the outer fixed ring, i.e., the pre-rotation angle; the annular area is divided into three fan-shaped areas with successively increasing pre-rotation angles (α1<α2<α3) and successively decreasing blade spacing angles (β1>β2>β3). This achieves differentiated and gradient guidance of the inlet airflow in the circumferential direction.

The invention relates to a preparation method and stretching equipment of a large-proportion pipe. The large-proportion pipe is characterized in that the outer diameter / inner diameter of the pipe is larger than 5. The preparation method comprises the following steps: preparing a pure quartz hollow pipe blank by using OVD, carrying out inner and outer diameter grinding processing on the pure quartz hollow pipe blank to obtain a pure quartz hollow sleeve with small wall thickness deviation, drawing the pure quartz hollow sleeve into a pure quartz pipe by using a vertical melting and drawing device, vacuumizing in the drawing process, and giving a certain relative vacuum degree to obtain the pure quartz pipe. And controlling the ratio of the pipe to the outer diameter / inner diameter to be more than 5. The pure quartz hollow tube blank is prepared through the OVD technology, the requirement for high purity of the quartz tube material is met, the hydroxyl content is low, the machining efficiency is high, and the manufacturing cost is low; the vertical melting and stretching equipment is simple and reasonable in structural arrangement, the annular thermal field is uniformly distributed, and the drawing processing quality of the pure quartz pipe is ensured; and meanwhile, the ratio of the outer diameter to the inner diameter is changed and controlled through the vacuumizing function of the vertical melting and stretching equipment.

The utility model relates to the technical field of automobile covering part flanging processing, and discloses an automobile covering part side flanging rotating die, which solves the problems in the background technology, and is characterized in that the rear wall of a lower die holder is fixedly connected with a sliding seat, an air pressure driver is fixedly arranged on the sliding seat, and the telescopic end of the air pressure driver is fixedly connected with a gear box; the bottom of the gearbox is slidably connected with the sliding seat, a servo motor and a driving wheel are mounted in the gearbox, the output end of the servo motor is fixedly connected to the driving wheel, one side of the driving wheel is meshed with a first driven wheel, the other side of the driving wheel is meshed with a second driven wheel, and one side of the second driven wheel is meshed with a third driven wheel. The first driven wheel and the third driven wheel are fixedly connected with a pair of wheel discs respectively, flanging pieces are fixedly connected to the disc faces of the two wheel discs respectively, pre-flanging releases partial elastic deformation in advance, the springback amount after final flanging is obviously reduced, the geometrical shape of materials is optimized, and the follow-up forming process is more stable.

A laser cutting method for producing n trimmed sub-blanks from a master blank made of metallic material, where n is an integer strictly greater than 1, the laser cutting method comprising the following steps: - Op1 / Positioning the master blank on a cutting table, the cutting table comprising n strips arranged to move relative to each other in a transverse direction; - Op2 / Clamping at least a portion of the master blank to the cutting table; - Op3 / Cutting n undragged sub-blanks from the master blank in a longitudinal cutting direction using a laser source; - Op4 / Separating the n strips of the cutting table from each other in a transverse direction; - Op5 / Releasing the clamps; - Op6 / Clamping the n undragged sub-blanks to the n strips; - Op7 / Laser trimming the n undragged sub-blanks to form n trimmed sub-blanks; - Op8 / Releasing the clamps; - Op9 / Unloading the n trimmed sub-blanks from the cutting table.

The utility model discloses a pneumatic extinguisher impeller with novel three-dimensional structure blades, relates to the technical field of pneumatic extinguishers, and solves the problems that the original impeller blade configuration and volute structure cause certain loss of internal gas flow, the gas flow rate at an outlet is influenced, and the gas flow rate is influenced. The backpack type pneumatic extinguisher comprises an impeller body, arc-shaped blades are arranged in the impeller body, through holes are formed in the positions, between the blades, of the impeller body, the size parameters of the blades of the impeller are improved, and the size parameters comprise the size on the horizontal plane and the size perpendicular to the plane of the impeller; the geometric configuration of the impeller blade is improved, and the geometric parameters of the impeller blade and the volute are integrally optimized; the energy loss caused by gas flowing in the pneumatic extinguisher is improved, and the working efficiency of the impeller of the pneumatic extinguisher is improved.

The present application provides an evaluation method for cutting a crystal ingot. The evaluation method includes the following steps. A plurality of sampling points are set on a test piece of the crystal ingot. Then, a plurality of observation planes are set. Each observation plane is formed by at least two adjacent sampling points. After that, the average value of the measured values of the sampling points included in each observation plane is calculated. And the observation plane corresponding to the minimum average value is taken as the reference plane for cutting the crystal ingot.

The application discloses a kind of parameterized modeling-based optimization design method and system of centrifugal fan volute profile, belong to industrial centrifugal fan design field.The method includes: firstly, volute profile away from volute tongue side is constructed, determine the width of two circular arcs away from volute tongue side of volute;Second volute tongue profile parameterization constraint, define volute tongue opening degree β, volute tongue radius R, volute tongue center and impeller center distance D key parameter, volute tongue geometry is controlled by three parameters independently;Finally, profile fusion and optimization, adopt single circular arc to connect volute profile away from volute tongue side and volute tongue profile tangentially, avoid geometric over definition problem, complete overall modeling.By improving the degree of freedom of volute tongue area, effectively reduce the flow separation and impeller interference at volute tongue, optimize the uniformity of volute internal flow field.

The invention discloses an Ansys thermosetting coupling analysis method for a brake disc based on Spaceclaim, relates to the technical field of brake disc thermosetting coupling simulation, and aims at solving the problems that an existing racing car brake disc thermosetting coupling analysis method is complex in working condition, large in calculation amount and not easy to operate. The method is technically characterized by comprising the steps that firstly, a brake disc and friction plate model is established and imported into finite element analysis software Ansys, materials are selected for the brake disc and the friction plate, material attributes are input, and the step number and time are set; 2, boundary conditions are applied, force generated by braking is regarded as a linear process, and braking force is applied; step 3, repairing the distorted grid; 4, defining a contact surface as friction, a formula as a generalized Lagrangian method, updating rigidity as each iteration, and the rest as program control, setting a connection mode as geometry-ground, and a type as revolution; and 5, temperature distribution and deformation quantity are obtained through thermosetting coupling analysis.

The invention discloses a fan blade and a fan, and relates to the technical field of electric appliances. The hub comprises a hub body and a connecting piece integrally formed with the hub body, the connecting piece is located at the center of the hub body, a first assembly hole is formed in the center of the connecting piece, and the connecting piece and the first assembly hole are both of a D-shaped structure. And the outer side of the connecting piece is provided with a stepped shape-following groove which is arranged around the connecting piece. Therefore, the D-shaped first assembly hole is directly formed in the fan blade through one-time injection molding, and on the basis that the assembly tolerance requirement is met, the production process is simplified, and the production cost is reduced. Moreover, the geometric structure of the connecting piece can be optimized by introducing the stepped shape follow-up groove in the outer side of the connecting piece, so that the cooling shrinkage caused by the structural thickness difference of the connecting piece is reduced.

The invention provides an X-ray tube primary optical testing device. The X-ray tube primary optical testing device comprises a protective shell, a radiation source and a detector, wherein the protective shell is used for testing a test article; the radiation source and the detector are arranged in the protective shell and are adjustable in position; the detector is used for receiving a signal sent by the radiation source; a test article is placed in the protective shell; two groups of adjusting mechanisms which are oppositely arranged and are distributed on the left side and the right side of the test article are arranged in the protective shell; the adjusting mechanisms are used for adjusting the positions and the angles of the radiation source and the detector in the protective shell; the inclination angles and positions of the radiation source and the detector are adjusted through the adjusting mechanism, so that the imaging accuracy and definition can be improved, as images are allowed to be obtained at different angles, the geometric structure of the detection system is optimized, and more comprehensive information is provided. In addition, adjustment of inclination angles and positions of the radiation source and the detector can meet different detection requirements. In addition, by adjusting the positions of the radiation source and the detector, the unnecessary detection time can be reduced, and the detection efficiency is improved.

The present invention provides a columnar specimen fatigue test loading device, which belongs to the field of material testing devices, and includes: a load transfer member, a first limit end is arranged in the middle of its inner wall; a force member, the outer diameter of which matches the inner diameter of the load transfer member, and a second limit end is arranged on its inner wall; one end of the force member is detachably connected to the load transfer member, and the other end is provided with a through hole; the first limit end and the second limit end are both truncated cone structures with cavities; a clamping assembly, which includes two symmetrically arranged clamping blocks; when the clamping assembly is used, it is located between the load transfer member and the force member, and when a columnar specimen is clamped between the two clamping blocks, the two clamping blocks form a spindle-shaped structure, and at this time, the two side conical surfaces of the spindle-shaped structure formed by the two clamping blocks are respectively abutted against the inner walls of the first limit end and the second limit end. The device can ensure uniform stress distribution at the ends of the columnar specimens in fatigue tests, and avoid brittle failure caused by concentrated force at the ends of the columnar specimens.

The present invention discloses an air cooling and sealing system for a fuel cell air compressor, comprising an air compressor; an airway flow structure, wherein the airway flow structure is arranged in the air compressor, and the airway flow structure comprises a main air inlet, an axial air inlet duct and a radial air inlet duct; a sealing structure, wherein the sealing structure is arranged at both axial ends of the air compressor; while satisfying a reasonable air cooling flow ratio of each part, the structure of the air cooling flow channel system is simplified, and the additional annular structure of the above-mentioned patent is avoided; in terms of sealing design, the sealing structure takes into account the balanced axial force, determines the direct size, adopts a labyrinth seal design, and optimizes the geometric size, thereby reducing leakage and improving the compression efficiency of the air compressor.

The present application relates to the field of industrial internet, and provides a federated learning method and system for training of an industrial internet edge sensor device. The method comprises: distributing global model parameters and aggregated momentum to a selected subset of edge sensor devices, and initializing to obtain local model parameters and local momentum; dividing the local model parameters into multiple parameter blocks, performing momentum updating on the current batch gradient through a momentum accumulation algorithm to obtain a momentum matrix; performing orthogonalization processing on the momentum matrix through a Newton-Schulz iteration algorithm to obtain an orthogonalization matrix; performing momentum gradient alignment scoring on the multiple parameter blocks to obtain a smooth alignment score; performing weighted updating on the orthogonalization matrix to obtain updated parameter blocks; and aggregating the parameter block increments and the updated momentum by the server to obtain updated global model parameters and updated global aggregated momentum. The present application reduces the communication frequency and improves the training efficiency of the edge sensor device.

The utility model discloses a novel truss structure with node rings. The novel truss structure comprises an upper truss structure and a double-row column supporting structure, the upper truss structure comprises an upper chord member, a lower chord member, inclined legs, transverse pull rods, web members and node rings; the inclined legs are located between the upper chords and the lower chords, one ends of the inclined legs are connected to the joints of the lower chords and the stand columns, and the other ends of the inclined legs are connected to one fourth or three fourths of the upper chords on the same side; the upper end of the transverse pull rod is connected to the joint of the upper chord and the inclined leg, and the lower end of the transverse pull rod is connected to the middle top of the lower chord; the three node rings are respectively arranged at the joint points of the upper chord, the inclined legs, the transverse pull rods and the web members on the left side and the right side of the upper truss structure and the joint points of the transverse pull rods, the web members and the lower chord members in the middle of the upper truss structure in a surrounding manner. A traditional steel structure factory building beam is replaced by the novel truss with the node ring, and the problems that a traditional beam is insufficient in bearing capacity and large in deformation can be effectively solved.

The application discloses a method for manufacturing photovoltaic BC cells by using inkjet printing hot melt ink, which comprises the following steps: step 1, silicon wafer pretreatment; step 2, hot melt ink preparation; step 3, inkjet printing equipment debugging; step 4, P area mask manufacturing; step 5, etching back process for manufacturing P area; step 6, removing P area mask; step 7, N area mask manufacturing; step 8, etching back process for manufacturing N area; step 9, high-temperature activation and doping optimization; and step 10, subsequent processing. The method can overcome the problems of complex process, high cost and poor mask stability in the prior art, and achieve the goals of simplifying the process, reducing the cost, improving the cell performance and production efficiency.

The invention belongs to the technical field of electro-catalytic materials, and particularly relates to a transition metal-based heterojunction nano array electrode material and a preparation method and application thereof. The transition metal-based heterojunction nano array electrode material provided by the invention is prepared by three steps: firstly, placing a current collector in a mixed solution of transition metal salt and an organic ligand for reaction to obtain a metal-organic ligand precursor array material; then, the precursor array material is placed in a solution containing oxometallate to be treated; and finally, carrying out high-temperature gas-solid reaction with a selenium / tellurium source. The material can be used as an electro-catalytic material, shows excellent catalytic activity and stability in sulfide oxidation reaction (SOR), and provides an efficient and green solution for sulfur-containing wastewater treatment.

The present application relates to the technical field of turbine blade profile, and discloses a turbine blade geometric parameter optimization method and device and electronic equipment, the method comprises: obtaining the geometric parameter of target turbine blade and the preset parameter of preset turbine blade model;According to the geometric parameter of target turbine, the target blade model of target turbine is generated;According to the geometric parameter of target turbine blade, the target parameter of target blade model and the preset parameter of turbine blade model, the deviation optimization function between the target blade model of target turbine and the preset turbine blade model is generated;According to the deviation optimization function, the geometric parameter of target turbine blade is optimized.The present application does not need manual adjustment of the geometric parameter of turbine blade, but through the deviation optimization function, the geometric parameter of target turbine blade is automatically optimized, and then the geometric parameter of turbine blade is efficiently and accurately optimized.