41results about How to "Avoid experiment" patented technology

The invention relates to a bolt connection joint surface stiffness identification method considering the uncertainty. The method comprises the following steps of S1, building a finite element model ofa bolt connection structure according to geometrical parameters and material parameters of a connected piece and a bolt connecting piece; S2, carrying out a modal test on bolt connection structures under different pre-tightening torques to obtain structural interval uncertainty modal parameters, namely, obtaining a test mode parameter interval; S3, on the basis of the finite element model of thebolt connection structure, building a response surface model between material parameters of a thin-layer unit and dynamic characteristics of the structure; S4, in combination with the response surfacemodel and a Monte Carlo method, obtaining a calculation mode parameter interval; and S5, building an objective function according to the test mode parameter interval and the calculation mode parameter interval, identifying an interval of the material parameters of the thin-layer unit of a joint surface, and realizing an equivalent finite element model of the bolt connection structure of the thin-layer unit. The problem of the uncertainty of the joint surface stiffness in numerical simulation of the bolt connection structure in engineering is solved.

The invention discloses a thermal cycling test condition cutting method suitable for different spacecraft electronic equipment. Based on the statistical law of historical fault distribution and thermal fatigue faults of a subsystem and a single-machine stage of an spacecraft, a comprehensive fatigue acceleration index is obtained by using a re-weighting method, and determining criteria and acquisition methods of underlying model parameters of the spacecraft are also provided. According to the thermal cycling test condition cutting method disclosed by the invention, the problem that a thermalcycling test condition cutting formula in MIL-STD-1540B and GJB 1027-2005 'Test Requirements for Launch Vehicles, Upper Stages and Spacecrafts' cannot cover the fault types of all types of the spacecrafts and all types of the subsystems can be solved, and the cost of the spacecrafts can be controlled on the basis of avoiding over-tests and under-tests.

The invention discloses a method and device for determining the effective Doppler bandwidth of a fuze receiver. The method comprises the steps of dividing a target into multiple target scattering surface elements after geometric modeling is conducted on the target, calculating the Doppler shift of each target scattering surface element and the echo power generated by each target scattering surface element under the missile target encounter condition, drawing a Doppler frequency spectrum diagram of the target according to the calculated Doppler shift and echo power of each target scattering surface element, and cutting out a spectral line range within which echo power is larger than set threshold power from the drawn Doppler frequency spectrum diagram and determining the effective Doppler bandwidth of the fuze receiver according to the cut-out spectral line range. By the adoption of the method and device, estimation of the effective Doppler bandwidth of the fuze receiver can be achieved, so that the fuze receiver can be designed based on the estimated effective Doppler bandwidth of the fuze receiver during fuze slideway testing, and then fuze slideway testing is facilitated.

The invention discloses a method for comprehensively evaluating the combustible dust explosion hazard level by utilizing multi-element dust explosion parameters. The method adopts fuzzy mathematics theory and analytic hierarchy process (AHP) in the system evaluation method, Using representative conventional explosives, According to the minimum ignition energy of dust cloud, the minimum ignition temperature of dust cloud, the minimum ignition temperature of dust layer, the lower limit of explosion, the maximum explosion pressure, the maximum explosion pressure rise rate and the characteristic parameters of explosion index, the membership function is established, and the evaluation model is established to evaluate the explosion hazard of different dust. The comprehensive evaluation method ofthe combustible dust explosion hazard grade established by the invention is simple, Easy to popularize, avoid tedious calculation and test, combine the existing data to obtain the corresponding comprehensive index value, easy to form a common evaluation standard, the result is intuitive, rapid identification of combustible dust dust explosion hazards, can provide guidance for the enterprise design safety production process.

The invention discloses a drainage asphalt mixture optimization design method based on a composition mechanism. The method comprises the following steps: (1) setting a target void ratio, and carryingout grading trial; (2) selecting a corresponding asphalt film thickness according to the type of the used high-viscosity asphalt and the nominal maximum particle size, and estimating the asphalt consumption; (3) checking a skeleton structure, sequentially checking a local skeleton and a global skeleton of each primary gradation according to a gradation skeleton theory suitable for the drainage asphalt mixture, and determining a gradation coarse aggregate part; (4) inspecting the void structure, forming a Marshall test piece, sequentially inspecting the void ratio and the effective void ratio according to the effective void ratio requirements of different nominal maximum particle sizes PAC, and determining optimal gradation; (5) determining the optimal asphalt-aggregate ratio, and inspecting asphalt coating; and (6) performing a performance test, and verifying the pavement performance. According to the method, each design link corresponds to each key performance, optimization and adjustment can be carried out in a targeted manner, and the test time and consumables are saved while the design quality of the drainage asphalt mixture is ensured.

The invention discloses a seat hard point and hard point size rapid simulation calculation method, and belongs to the technical field of seat development, and the method comprises the steps: building a dummy finite element model, building a finite element model of a to-be-tested seat, building a transmission relation, applying a boundary condition, and defining and outputting a simulation result. According to the method, the finite element simulation technology is used for conducting rapid simulation measurement on the hard point and the size of the hard point, when a simulation result and a design target reach a certain consistency degree, a sample piece is manufactured for physical verification, and evaluation and improvement of a design scheme in the concept stage are facilitated. In addition, the method also has the characteristics of low investment, low cost, convenience, rapidness, accurate and objective result, flexible application and the like. An accurate transmission relation between model input and parameter output is found, the complexity of the model is reduced as much as possible, and the accuracy of a result is improved. The simulation technology is utilized to directly avoid multiple times of sample piece trial-manufacturing and testing, and rapid measurement and verification can be rapidly and conveniently carried out at any time in the design process.

The present invention discloses a crushing mechanism of a molding device for infant multi-grain nutritional supplementary food granules. The crushing mechanism comprises a main body, a base is arranged at the lower end of the main body, a charging inlet is arranged near one side of the upper end of the main body, the charging inlet is matched with a second conveyor belt, a cooling water outlet isarranged on the upper end of one side of the main body near the charging inlet, a cooling water inlet is arranged at the lower end of the other side of the main body, a discharging outlet is arrangedat the position near the lower end of the main body, and a third vibrating screen is arranged at the lower end of the discharging outlet. The crushing mechanism realizes the control of particle size range of granular surface without the need of preparing corresponding production equipment separately according to production needs, thereby saving occupying space; and the crushing mechanism realizesthe automatic control throughout the whole process, thereby saving production costs.

The invention discloses a cigarette coating test device. The cigarette coating test device comprises a base, a transmission assembly, a paint roller assembly for coating the cigarette, a cigarette limit assembly, a cigarette loading and unloading clamp for fixing a cigarette holder of the cigarette, a scraper assembly and a paint box arranged on the base. the transmission assembly is configured toat least provide power to the rotation of the paint roller assembly; the cigarette limit assembly is configured to restrict movement of the cigarette away from the paint roller assembly; the scraperassembly is used for removing excess paint on the paint roller assembly; and the paint box is used for supplying a paint to the paint roller assembly. Through the above device, a cigarette sample forthe cigarette coating test can be conveniently produced, and the test on a cigarette unit is avoided, and the influence of the cigarette test on daily production can be prevented.

The invention relates to an emissivity extrapolating prediction method under the action of F46 thermal control material atomic oxygen, belonging to the technical field of aerospace. The method comprises the following steps: placing F46 thermal control material in an atomic oxygen ground test device, using atomic oxygen with a certain energy and density to test; in the testing process, measuring the emissivity (epsilon h) of F46 material to obtain the change data of emissivity under the action of atomic oxygen with a certain flux; after analyzing and fitting data, establishing a mathematical formula of F46 material under the action of atomic oxygen with a certain flux; and finally using the established mathematical formula to extrapolate the change data of emissivity (epsilon h) under the condition that the flux is more than the original flux of atomic oxygen. The method of the invention can be used to fast obtain the emissivity data of F46 material under the action of atomic oxygen with large flux, effectively improve the test efficiency and reduce the test cost.

The invention relates to an insulating glove withstand voltage test tool, which comprises an insulating glove, a hand model and a hand concave mold; a conductive glove made of conductive cloth is wornon the surface of the hand model, and a test grounding wire is led out of the conductive glove; the internal of the hand concave mold is fixedly covered with conductive cloth, a pressurizing line fortest is led out of the conductive cloth in the hand concave mold, and the hand model is manufactured according to the insulating glove; and the hand concave mold is manufactured according to the insulating glove, the insulating glove comprises an insulating glove body, and the insulating glove body is a five-finger glove or a connected-finger glove made of rubber. The invention further relates toa using method of the insulating glove withstand voltage test tool, and the using method is simple. The glove is prevented from being immersed in water for testing, the testing speed is increased, and the standard of the withstand voltage of each part of the glove is ensured.

The invention discloses a working parameter configuration method and device for gas injection equipment, and belongs to the technical field of gas drive oil extraction. The method comprises the steps:acquiring target bottom hole flowing pressure based on various parameters of an oil well and a bottom hole flowing pressure calculation model; on this basis, based on a pressure difference calculation model of each wellbore section, obtaining the lower end pressure of each wellbore section in sequence, and finally obtaining the wellhead gas injection pressure of the oil well; based on the wellhead gas injection pressure, configuring working parameters of gas injection equipment; and injecting gas into the oil well. In the process, wellhead gas injection pressure is obtained based on preset bottom hole flow pressure and various parameters of an oil well. The method is simple, rapid and convenient, avoids the use of a gas injection compressor and related corollary equipment for testing, also avoids a complex implementation process, can quickly configure the working parameters of the gas injection equipment, improves the efficiency of the gas injection process, and also reduces the costof the gas injection process.

The invention can provide a method and a device for optimizing a photoetching process, and a computer storage medium. The method comprises the following steps: acquiring data of a target photoresist, wherein the data of the target photoresist comprises photoresist spatial data and photoresist component data; and segmenting the space occupied by the target photoresist according to the photoresist spatial data to determine a plurality of unit blocks, wherein each unit block is provided with lattice points; determining original state information of each lattice point position on the target photoresist according to the photoresist component data, and determining current state information of each lattice point position on the exposed target photoresist according to preset process parameters and the original state information; and predicting the morphology of the developed target photoresist through the current state information. The morphology of the developed photoresist can be predicted in advance so as to guide and optimize an actual photoetching process, research and development of new varieties or new types of photoresists are facilitated, the research and development progress is promoted, and the research and development cost is reduced.

The invention relates to the technical field of automobile collision tests, and discloses a power battery assembly bottom collision test device and test method. A test sample piece of a power battery assembly is mounted at the bottom of a test trolley, the actual collision working condition can be better fitted, and the accuracy of a test result is ensured. Obstacles are arranged along a collision path, and the maximum collision limit value capable of being borne by the power battery assembly can be obtained. By adjusting the heights of the obstacles and road shoulders, the collision situation when the test trolley passes through the obstacles and the road shoulders with different heights can be simulated, collision data under various collision working conditions can be obtained, and the test range is expanded. After a data processing module receives and processes test parameters, obtained by a data acquisition module, of the test sample piece, the fault level of the test sample piece can be obtained, a display terminal displays the test condition of the test sample piece in real time, and a tester can conveniently observe the test result in real time and evaluate the result. The whole vehicle test is avoided, the test cost is reduced, the operation is simple, and the realization is easy.