42results about How to "Meet the design index requirements" patented technology

The invention discloses a sigmoid function fitting hardware circuit based on a Remez approximating algorithm. A sigmoid function fitting method is characterized by including the following steps that (1), the order of a fitting polynomial is determined; (2), a fitting interval of a sigmoid function is obtained; (3), a piecewise interval is obtained; (4), the fitting polynomial is obtained; (5), a coefficient storing module is designed; (6), a polynomial calculation module is designed; (7), a judgment module is designed; (8), the fitting hardware circuit is obtained; (9), a fitting execution interval where operands are located is judged; (10), a coefficient of the fitting polynomial is read; (11), fitting calculation is carried out in the polynomial calculation module. On the basis of reducing hardware resource consumption, the calculation accuracy is improved, the calculation speed is increased, and the flexibility of a calculation structure is promoted.

The invention relates to a composite material grid skin structure part die compression molding forming method, and belongs to the technical field of composite material forming. A set of control measures suitable for skin grid structure part die compression molding forming technology are found through reasonable rib winding and skin laying technological design, one-time integral forming of a composite material skin grid structure part is achieved, product deformation is small, the thickness is uniform, the operation efficiency is high, and rib winding and skin layer laying for the composite material skin grid structure part can be completed only through one day.

The invention relates to a universal portable remote high-power steering gear voltage and current measurement and calibration device, which comprises a power supply module, a bus communication module, a remote distance/peak current judgment module, a voltage and current range gating module, a signal conditioning/acquiring/converting/outputting module, and a principal computer test system interface module. The device has a small size and a complete range of interfaces, can be easily carried and used in all test sites, is suitable for measuring and calibrating the current and voltage of a remote to-be-tested steering gear with high peak current and rated voltage, is provided with a multi-gear measurement output range, is equipped with a variety of interface equipment, and is of high universality.

A thrust chamber injector of a hydrazine type low-thrust single-unit engine adopts a radial injection mode and structurally comprises injection pipes, a thrust chamber and an injection disc, wherein the injection pipes are fixed to the injection disc and installed at the front end of the thrust chamber, a thrust chamber head baffle is arranged at the front end of the thrust chamber, the injection disc is of an end cover structure capable of enveloping the front section of the thrust chamber, the injection disc is in matched connection with the front section of the thrust chamber, the front section of the thrust chamber is sleeved with the injection disc, an annular injection cavity is arranged between the injection disc and the front section of the thrust chamber, more than one circle of injection micropores are evenly formed in the periphery of the barrel wall of the annular injection cavity corresponding to the front section of the thrust chamber, the injection pipes are circumferentially and evenly distributed and fixed to the injection disc, and spray nozzles of the injection pipes correspond to the annular injection cavity. A propellant is radially injected through the micropores, reasonable injection pressure drop can be provided under the condition that related propellant flows are ensured, and the thrust chamber injector is reasonable in structure and simple in manufacture, is easily retrofitted to be serialized, and can meet the power demand of the single-unit engine.

The invention belongs to the technical field of armored vehicles, and relates to a multi-point automatic locking mechanism suitable for an armored vehicle window door with the large size and high sealing requirement. The locking mechanism mainly includes a rotary arm, an electric cylinder, locking tongue guide seats, connecting rods and pull rods; and the locking mechanism is automatic, a power source is the electric cylinder, the rotary arm is driven to rotate around a rotary arm support during expansion and contraction of the electric cylinder, the three ends of the rotary arm are connectedwith the three connecting rods through the pull rods correspondingly, the connecting rods are connected with three locking tongues in a threaded mode along a linear bearing, the locking tongues extendand retract along the locking tongue guide seats under acting force of the connecting rods, the locking tongues and a window door frame are fitted and released, the locking and unlocking functions ofthe window door are realized. In case of failure of the electric cylinder, a pin shaft at the connection between the electric cylinder and the rotary arm can be loosened and released, and by rotatingthe rotary arm through tools, the manual locking and unlocking actions of the locking mechanism are realized.

The invention discloses a simple and quick geometric-constraint and weight-function calculation method suitable for use in a complex aerodynamic shape of an aircraft. An entirely new evaluation methodof complex-aerodynamic-shape optimization design geometric-constraint and a method of weight-function selection of sensitivity-based multi-point optimization are adopted, geometric constraints of thickness, volume and the like of the any complex shape are accurately and conveniently calculated, and the calculation method is compatible with discrete surface multi-block-butt-joint-connection-grids,discrete surface unstructured-grids and the like; and weight-function selection can fully utilize valid information of existing weight-function data, and has weight coefficient selection instructiveness, and thus design potential of sensitivity-based optimization technology is fully exploited.

The invention discloses a tubular facesheet-linked fabric with ribs additionally arranged in the circumferential/axial direction and a preparation method thereof. The tubular facesheet-linked fabric with the ribs additionally arranged in the circumferential/axial direction comprises round tubes and rib layers in the circumferential/axial direction; the rib layers are integrally formed with the round tubes. The tubular facesheet-linked fabric with the ribs additionally arranged in the circumferential/axial direction and the preparation method of the tubular facesheet-linked fabric can achieve integrally rib adding in the circumferential direction and the axial direction at any position of the tubular facesheet-linked fabric, the rib dimensions and the fiber volume content can be designed, the structure is intact, and the rib layers in the circumferential/axial direction are well connected with the tubular facesheet-linked fabric, so the problem of integral bidirectional rib adding of the tubular facesheet-linked fabric is solved; in addition, as fibers in the thickness direction of the rib layers and the tubular facesheet-linked fabric are continuous, the connection effect is far superior to that of an original gluing or riveting mode; according to tests of the composite fabric, the performance of the fabric can totally meet the requirement of the design index and the fabric has a practical application value.

The invention provides a 24 kilomega Ethernet back plug-in card achieved by utilizing a 79527 to 5002 two-layer connector. The 24 kilomega Ethernet back plug-in card achieved by utilizing a two-layer connector is connected to a system mainboard and used as an expansion card of the system mainboard. The back plug-in card comprises a zone 3 connector, an upper electric control circuit, a monitoring module, a power source module 1, a power source module 2 and a two-way connector module. The zone 3 connector is communicated with the upper electric control circuit, the monitoring module and the two-way connector module. The monitoring module receives data of the zone 3 connector and is communicated with the two-way connector module. The upper electric control circuit sends power source signals to the power source module 1. The power source module 1 conducts depressurization operation on received voltage signals and then respectively transmits the voltage signals to the power source module 2 and the two-way connector module. The 24 kilomega Ethernet back plug-in card achieved by utilizing a 79527 to 5002 connector possesses enough space to hold a 24 kelomega socket and meets design objective requirements of the 24 kilomega Ethernet card with a framework of the ATC.

The invention discloses a triangular-section arc-shaped composite truss which is of an arc-shaped three-dimensional structure formed by connecting an outer chord member, a first inner chord member and a second inner chord member which are parallel to one another through a triangular-section web member assembly. A first outer diagonal web member, a second outer diagonal web member and an inner diagonal web member are diagonally arranged on the outer chord member, the first inner chord member and the second inner chord member between the adjacent triangular section web member assemblies respectively and are fixedly connected with the four-way joint, and each member is made of a carbon fiber composite material; the invention further discloses a preparation method of the triangular-section arc-shaped composite material truss. The large-radian composite material truss structure with the curvature is formed by connecting the web member assemblies with the triangular sections, the size precision is high, the loading performance is good, the truss structure achieves ultra-light weight, and modular connection of large composite material pipe trusses is achieved; the self-heating mold is adopted for preparation, curing equipment does not need to enter or exit, the quality stability of the arc rod piece is improved, and the size precision is high.

The invention provides a spherical top cover assembly tailor-welding method and device. The tailor-welding method comprises the four steps. The tailor-welding device comprises a base, a positioning base, an annular body, an upper presser structure, an internal supporting structure, an outer supporting structure capable of positioning the outer wall of a spherical top cover, a press plate assemblycapable of tightly pressing the upper end face of a connection flange, and a first press ring capable of positioning a tunnel connection flange. The spherical top cover assembly tailor-welding methodand device solves the technical problems that because the structure of the spherical top cover is specific, the assembly and welding difficulty between parts is high, and welding methods in the priorart are not suitable for assembly welding.

The invention discloses a backflow combustion chamber casing head structure, a manufacturing method thereof and an engine combustion chamber. The backflow combustion chamber casing head structure adopts an annular base structure and comprises arch-shaped bearing beams and nozzle parts which are alternately arranged along the circumferential direction of the annular base structure, and the arch-shaped bearing beams and the nozzle parts are in smooth transition connection by adopting arc surfaces. The arch-shaped bearing beams are of a base body structure with the cross sections in an arch shape, and the radial size of the arch-shaped bearing beams is gradually reduced in the direction from a combustion chamber case to a turbine case. Each nozzle part comprises a nozzle mounting surface and a connecting surface, each nozzle mounting surface is positioned between every two adjacent arch-shaped bearing beams and is parallel to the head part of a flame tube, each connecting surface is positioned at the bottom end of each nozzle mounting surface and is vertical to each nozzle mounting surface, and the nozzle mounting surfaces are in smooth transition connection with the connecting surfaces. The backflow combustion chamber casing head structure forms a similar frame type structure, does not deform when being subjected to load action, always ensures concentricity of a rotor and a stator of an engine, and avoids the problems of scraping, abrasion, vibration and the like of the rotor.

The invention relates to a detection device for detecting a drainage coefficient of a drainage asphalt pavement. The detection device comprises a liquid storage container, the interior of the liquid storage container is hollow to form a cavity used for storing liquid, a liquid discharging channel communicated with the cavity is formed in the bottom of the liquid storage container, and a liquid outlet of the liquid discharging channel is vertically downward; a test net which is arranged below the liquid outlet of the liquid storage container and can be attached to a tested drainage asphalt pavement; the test net is provided with vertical drain holes which are uniformly distributed, and a plurality of temperature sensing concentric circles which take the center of the projection of the liquid outlet of the liquid discharge channel in the vertical direction as the center of a circle and are formed by coating a temperature sensing color-changing coating. When the detection device is used for detecting the drainage coefficient of the drainage asphalt pavement, the drainage coefficient of the drainage asphalt pavement can be vividly judged and tested, and the detection range can meet thedesign index requirements of the drainage asphalt pavement. The invention also relates to a method for detecting the drainage coefficient of the drainage asphalt pavement.

The invention discloses an electric vehicle battery box charging control device, system and method and an electric vehicle. The device is characterized in that a first end of a first on-off module is connected with a charger, a second end of the first on-off module is connected with a plurality of battery boxes, and the first on-off module is used for controlling connection or disconnection between the battery boxes and the charger; a second on-off module is connected with the plurality of battery boxes and is used for controlling two battery boxes to be connected in series or disconnected; a battery management master controller is connected with the first on-off module, the second on-off module and the plurality of battery boxes and is used for acquiring battery state data of the plurality of battery boxes and judging whether the battery state data of part of the battery boxes are lower than a preset threshold value or not, if yes, the first part of the battery boxes are controlled to be connected in series and connected into the charger for charging, and the connection between the second part of the battery boxes and the charger is disconnected. According to the invention, the problems of low equalization efficiency and long charging time existing in series charging of a plurality of battery boxes can be solved.

The invention provides a 24 kilomega Ethernet back plug-in card achieved by utilizing a 1658894 connector. The 24 kilomega Ethernet back plug-in card achieved by utilizing the connector is connected to a system mainboard and used as an expansion card of the system mainboard. The back plug-in card comprises a zone 3 connector, an upper electric control circuit, a monitoring module, a power source module 1, a power source module 2 and a Terminal Equipment (TE) connector module. The zone 3 connector is communicated with the upper electric control circuit, the monitoring module and the TE connector module. The upper electric control circuit sends power source signals to the power source module 1, the power source module 1 conducts depressurization operation on received voltage signals and then transmits the voltage signals to the power source module 2 and the TE connector module. The 24 kilomega Ethernet back plug-in card achieved by utilizing a 1658894 connector possesses enough space to hold a 24 kelomega socket and meets design objective requirements of the 24 kilomega Ethernet card with a framework of the ATC.

The invention relates to a low-temperature-resistant and ablation-resistant butadiene rubber vulcanized thermal insulation material, and a preparation method and an application thereof. A novel low-temperature-resistant base material is adopted, novel high-temperature-resistant and ablation-resistant resin is selected, a vulcanizing agent, a vulcanization accelerator and other preferable components are combined, the ratio of the optimal components is given, and an ablation-resistant technique is combined to vulcanize and mold a thermal insulation material, so the obtained material has very excellent low-temperature mechanical properties and excellent ablation performance, can meet new requirements of an engine on the thermal insulation material, meets the requirements of the thermal insulation material on excellent mechanical properties and ablation resistance of materials at different temperatures, and can meet the requirements of the engine on comprehensive properties such as the mechanical properties, the bonding performance, the ablation resistance and the erosion resistance of an interlayer material at the same time.

The invention discloses an assembling method of an ultrafast laser reflecting mirror for a miniature laser gyroscope, and belongs to the technical field of laser gyroscope reflecting mirror assembly.The assembling method comprises the following steps that 1, a laser gyroscope cavity and a reflecting mirror are cleaned through a cleaning agent, and then an optical adjusting tool is fixed; and (2) transferring the laser gyroscope cavity and the reflector which are fixed in the step (1) to a welding area of a laser welding machine, and carrying out laser welding. The assembling method is based on the laser micro-welding technology, in the welding process of the laser gyroscope reflector and the resonant cavity, the quality of a coating layer of the reflector is well protected, the whole welding process is short in time and easy to operate, batch production can be achieved, and the production efficiency can be greatly improved; and through an impact test, the resonant cavity subjected to laser micro-welding passes a 10000 g unprotected impact test, and the performance of the resonant cavity is tested to meet the design index requirement after impact.