12 results about "High performance design" patented technology

The invention discloses a cement stabilized macadam mechanical property analysis method based on maximum aggregate nominal particle size, and relates to the technical field of cement stabilized macadam mechanical property analysis, the method comprises the following steps: preparing skeleton dense type cement stabilized macadam test pieces with different nominal maximum particle sizes; carrying out a macroscopic mechanical test to obtain a stress-strain curve and a crushing value; establishing a three-dimensional discrete element numerical model corresponding to the test piece, performing uniaxial compression simulation, and ensuring the reliability through model verification; and based on the verified model, quantitatively analyzing the contact force distribution, the contact quantity characteristic and the microcrack evolution law from the microscopic level. According to the analysis method disclosed by the invention, a mechanism that the nominal maximum particle size improves the macroscopic performance of the material by regulating and controlling an internal force chain network and inhibiting damage accumulation is disclosed through a macro-micro combination means, and a scientific micro-mechanical basis and a quantitative analysis tool are provided for grading optimization and high-performance design of the cement stabilized macadam base.

The invention discloses a solid rocket engine bearing structure lightweight determination method based on a carbon fiber composite material, and relates to the technical field of composite material structure design, and the method comprises the steps: obtaining the structure size and geometric shape of a fixed body; replacing a titanium alloy material with a carbon fiber composite material, and determining a carbon fiber composite material structure response model based on a finite element modeling method; determining an optimal layering scheme based on structural response sensitivity analysis and a multi-objective optimization method; then determining a thickness optimization scheme based on the structural size and geometric shape of the fixed body and load distribution; determining a reinforcement optimization scheme based on a parametric modeling method; determining a metal reinforcement configuration by adopting a structural rigidity-quality collaborative evaluation method; and finally, determining a lightweight structure of the fixed body based on a composite material layering process design method. The mass of the fixing body structure can be reduced, the mechanical property of the fixing body structure is improved, and the high-performance design requirement of a solid rocket engine is met.

The invention discloses a microwave assembly laser welding airtightness detection method, and belongs to the technical field of microwave assembly packaging detection. According to the method, a clamping step is added before an existing air tightness detection process, a universal clamping tool is adopted to support a microwave assembly packaging cover plate, and welding seam stress concentration and cracking caused by the difference of air pressure inside and outside a microwave assembly cavity in the vacuumizing process are effectively prevented. The universal clamping tool comprises a clamping device and a mounting tool, the clamping device comprises an upper clamping plate, a lower clamping plate, a T-shaped bolt, a butterfly nut and a buffer pad, the mounting tool comprises a bottom plate, a transition plate and a toggle clamp, and the universal clamping tool is suitable for microwave assemblies of various sizes. On the premise of not changing the existing leak detection equipment, the problems of deformation of the cover plate and damage of the welding seam in the leak detection process are solved with low cost and high efficiency, and meanwhile, a larger space is provided for the high-performance design of the microwave assembly.

The present application belongs to the technical field of flexible robots, and relates to a structure optimization method of a fin ray effect gripper, comprising the following steps: step 1: a co-rotation modeling method is used to construct a force-deformation relationship model of the fin ray effect gripper as a fast evaluation model of the performance of the gripper; step 2: structure optimization design parameters and multi-objective performance evaluation indexes of the fin ray effect gripper are determined; step 3: based on a Bayesian optimization algorithm, the fast evaluation model is combined to construct a multi-objective structure optimization framework, global optimal sample search is performed on the design parameters, and a Pareto front is solved; and step 4: experimental verification is performed on typical optimal parameter combinations in the Pareto front, and optimal structure parameters of the gripper suitable for different gripping scenes are output. The present application can be applied to the design and optimization of flexible, rigid and rigid-flexible hybrid robot compliant mechanisms, and can be widely applied to the high-performance design and parameter tuning of gripper structures in industrial gripping, service robots, precision operation and the like.

The utility model provides a fuze device with a miniaturized proximity detector and a projectile body, and the fuze device comprises an air cap with a hollow structure, a detachably connected base, and a proximity detector which is located in the hollow structure of the air cap and is fixedly connected to the upper part of the base, according to the proximity detector, the encapsulation shell used for fixedly placing the circuit board device is arranged, the circuit board device is fixed by pouring the encapsulation glue, and the maximum radial diameter of the encapsulation shell is matched with the radial inner diameter of the upper end part of the hollow structure of the hood, so that the miniaturization of the proximity detector is realized, and the reliability of the proximity detector is improved. The geomagnetic satellite navigation system is adaptively installed at the front position of the front end of a projectile body, more layout space is provided for high-performance design of a guide cabin where a detector is located and a rear cabin section, the power of the detector and the geomagnetic satellite navigation system is increased, and the detection distance, the anti-interference capability, the positioning precision and the signal strength are all greatly improved.

The application discloses a cement stabilized macadam mechanical property analysis method based on maximum aggregate nominal particle size, relates to the technical field of cement stabilized macadam mechanical property analysis, and comprises the following steps: preparing skeleton dense type cement stabilized macadam test pieces with different nominal maximum particle sizes; performing macroscopic mechanical test to obtain stress-strain curves and crushing values; establishing a three-dimensional discrete element numerical model corresponding to the test pieces and performing uniaxial compression simulation, and verifying the model to ensure the reliability of the model; and based on the verified model, quantitatively analyzing contact force distribution, contact quantity characteristics and microcrack evolution law from a microcosmic aspect. According to the analysis method, the macroscopic performance of the material is improved by regulating the internal force chain network and inhibiting damage accumulation through the nominal maximum particle size, and the analysis method discloses the mechanism that the nominal maximum particle size improves the macroscopic performance of the material by regulating the internal force chain network and inhibiting damage accumulation, and provides a scientific microcosmic mechanical basis and a quantitative analysis tool for gradation optimization and high-performance design of the cement stabilized macadam base.

This application provides a novel capacitive DAC structure, which at least includes a fully differential DAC capacitor array, a comparator, and a sampling and holding switch provided between the fully differential DAC capacitor array and the comparator. In this application, by providing the sampling and holding switch, including a first logic switch, a second logic switch and a third logic switch, between the fully differential DAC capacitor array and the comparator, and changing the timing relationship of the switches to generate a stable common mode level Vcm, the area and power consumption can be greatly reduced, the IP competitiveness can be effectively improved, and it can be used for high-performance ADC design.

The invention discloses an airfoil profile stability optimization method and system for inhibiting transonic buffeting, and relates to the technical field of aircraft safety. According to the method, the geometric morphology of the airfoil profile is accurately described through CST parameterization, the grid quality and the calculation precision after the airfoil profile is deformed are guaranteed by combining the radial basis function dynamic grid technology, the flow stability is quantified by relying on the pre-solution gain, efficient iteration is conducted through the nonlinear conjugate gradient method, transonic buffeting can be remarkably restrained, and the flow stability can be remarkably improved; and the aerodynamic performance can be optimized on the premise that engineering constraints such as no reduction of the airfoil thickness and no reduction of the lift force are met, experience trial and error and violent search of traditional optimization are avoided, the efficiency and reliability of transonic airfoil design are greatly improved, and the method is suitable for high-performance design requirements of core components such as aerospace vehicle airfoils.

This invention discloses a forward-radiating heterogeneous integrated packaged antenna. Multiple dielectric substrates are stacked, with the first dielectric substrate thinned at all four edges and a rectangular ring etched at the bottom of the second dielectric substrate, both used to suppress surface waves and improve radiation efficiency. An air cavity is etched in the center of a third dielectric substrate to house a microcontroller chip (MMIC). An on-chip antenna is designed on the MMIC chip, and the antenna energy is transferred to the second dielectric substrate via the air cavity, then guided to the first dielectric substrate by a metallized via enclosure, and finally radiated into the air. A metal shielding layer is attached to the surface of the dielectric substrates, with a rectangular coupling window. This rectangular coupling window and the metal patch work together to regulate the transmission mode. This forward-radiating heterogeneous integrated packaged antenna combines MMIC chip technology and multilayer dielectric substrate technology, achieving both high-performance antenna design and miniaturized system packaging. It can be applied to large-scale phased array and inverse array systems in the millimeter-wave and terahertz bands.

The invention relates to a high-strength and high-modulus epoxy resin composition, a preparation method and an ultrahigh-compression composite material, and belongs to the field of wet prepreg manufacturing for structural composite materials. The composition comprises polyfunctional and micromolecular monofunctional epoxy resin monomers, an aromatic amine curing agent and an epoxy reactive diluent, the resin matrix constructs a high-strength and high-modulus composite epoxy system through the synergistic effects of introducing intramolecular rigid chemical bonds, enhancing intermolecular acting force, improving crosslinking density and the like, the tensile strength is larger than or equal to 125 MPa, and the modulus is larger than or equal to 5.0 GPa. The compression strength of the composite material prepared from the high-strength and high-modulus epoxy resin matrix and the domestic T800-grade carbon fiber reinforcement is larger than or equal to 2500 MPa, the compression-pull ratio is larger than or equal to 1.0, the compression strength and the compression-pull balance characteristic are obviously improved compared with an existing resin matrix composite material, and the high-performance design requirement of new-generation aerospace equipment can be met.

The invention discloses an EHD printing integrally-formed high-precision FPC antenna and a preparation method, and belongs to the technical field of FPC antennae. The EHD printing integrally-formed high-precision FPC antenna comprises a substrate and a Koch snowflake fractal radiation patch formed on the substrate; a metal line of the Koch snowflake fractal radiation patch has an optimized nominal width Wopt, and the Wopt is a parameter determined by modeling a line width manufacturing error of EHD printing into a random variable in a range of + / -15 [mu] m and carrying out collaborative fault-tolerant design on an antenna structure by taking the resonant frequency offset of the antenna not greater than 1.5% as an optimization target; the radiation patch is printed by conductive ink and is formed after synchronous ultraviolet precuring and stepped thermocuring, and the conductive ink contains supported Ag2O-MXene composite powder; through deep collaboration and optimization of a structure fault-tolerant design, a special functional material and a precision manufacturing process, the problem of mismatch from a high-performance design model to high-fidelity physical antenna manufacturing is solved, and particularly, a reliable integrated solution is provided for flexible electronic manufacturing of complex fine patterns.