41results about How to "Avoid experiment" patented technology

The invention relates to a method for producing a cast component which has cavity structures, using a 3D pattern of digital geometrical coordinates of the cast component by means of a ceramic mold, said method comprising the following steps: a) producing the core according to the 3D pattern by CNC technology in a first CNC production method; b) positioning the core in a treatment support; c) casting the pattern material around the core in a volume that is larger than the cubature of the cast component which according to the 3D pattern is spatially defined by the position of the core in the treatment support, and allowing the pattern material to solidify; d) producing an outer contour of a disposable pattern of the cast component from the solidified pattern material around the core according to the 3D pattern by CNC technology in a second CNC production method; e) applying a ceramic mold to the outer contour of the disposable pattern and forming a positioning connection of the ceramic mold and the treatment support; f) removing the disposable pattern from the ceramic mold around the core in the treatment support; g) casting metal into the ceramic mold around the core in the treatment support; h) allowing the molten metal to solidify to the solid cast component and i) removing the ceramic mold and the core from the cast component.

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 calculating the amount of crushed stones in the crushed stone seal layer, each crushed stone in the crushed stone seal layer is approximately regarded as a sphere (the diameter of the sphere is taken as the median value d of the particle size range of the crushed stones, and the radius r =2 / d, unit cm), according to the gravel's own density ρ (g / cm 3 ), the mass m(g) of a single crushed stone can be approximated; 2 ) plane, according to the maximum cross-sectional area S′ of the approximate sphere, the total number N of spheres required to cover a unit area can be calculated; since the crushed stones in physical engineering are not regular spheres, and the crushed stones are in contact with the crushed stones There is a certain gap between each other, so the calculated mass m of a single gravel and the total number N of spheres required to cover a unit area need to be corrected, and the correction coefficients are K 1 、K 2 ; Then calculate the consumption of gravel in the gravel seal according to the following formula: M=10.5K 1 K 2 ρr, where M is the paving unit area (1m 2 ) the mass of gravel required, in kg. The invention effectively solves the problem of determining the amount of crushed stones in the crushed stone seal layer, and can perform accurate quantitative calculations for crushed stones with different particle sizes, thus avoiding determination through tedious tests, and the calculation is simple.

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 discloses a method for calculating the amount of asphalt in the gravel seal layer. It includes the following steps: each gravel in the gravel seal is approximately regarded as a sphere, and according to the maximum cross-sectional area S' of the approximate sphere, the total number N of spheres required to cover a unit area can be calculated; according to the actual situation Correct the total number N of spheres required to cover a unit area calculated in theory, and the correction coefficient is K 1 ; The gap between gravel and gravel is filled with asphalt. When the gravel is arranged approximately as a sphere, the climbing height of the asphalt is between d / 3 and d / 2 to achieve the ideal effect; then, it is calculated according to the theoretical formula The amount of bitumen used in the gravel seal. The invention effectively solves the problem of determining the amount of asphalt in the gravel seal, and can accurately and quantitatively calculate the amount of asphalt required in the seal of gravel with different particle sizes, thereby avoiding determination through tedious tests, and the calculation is simple .

The invention discloses a test method of a mechanical structure collision resistance performance simulation experiment platform. The method comprises the following steps of setting a collision bench collision parameter, wherein the collision parameter includes a bench surface lifting height, a collision number and a collision frequency; then preparing a collision experiment; measuring a bench surface height and parallelism, and adjusting lifting systems of two sides of a bench surface till that the bench surface height reaches a preset height and a bench surface is in a horizontal state; beginning to simulate the collision experiment; starting a drag system of a collision bench so that an acquired collision waveform is in a corresponding tolerance band; and completing a set collision number so that the experiment is ended. In the invention, an influence factor of a collision process is considered from a plurality of aspects, the influence factor is corrected and finally a waveform required by the experiment is acquired. An accurate reference parameter is provided for the collision process of an actual object so that the object can be effectively prevented from being destroyed during the collision process.

The invention discloses an electric-rear-cover durability test bench. An electric-rear-cover durability test can be implemented on a body in white, experiment with an entire vehicle is avoided, and test cost is remarkably reduced; the technical scheme includes that a mode that a BCM (body control module) and a HDSG and are combined with a non-on-board controller (TBH) forms a control system of the test bench; only one type of a CAN data bus is related, so that a gateway can be bypassed, and direct access to a vehicle diagnosis port is achieved to perform detection on the running state of an electric rear cover.

The invention discloses a simulation-based design method for high-G-value wide-pulse shock waveforms. First, the shock wave index requirements and design variables are clarified, and the relative density of the honeycomb aluminum core in the honeycomb aluminum sandwich panel is calculated; The parameter test of the impact numerical test model is carried out to obtain the curves of acceleration versus speed under different relative densities of honeycomb aluminum; then the penetration coefficients of different cushioning materials are fitted to obtain the cavity expansion model equations of different materials, and then the required impact initial velocity is calculated As well as the velocity and acceleration of the projectile moving to the midpoint of each honeycomb aluminum sandwich panel, the relative density value of each honeycomb aluminum core is obtained by substituting the cavity expansion model equation of different materials; finally, the relative density value is input into the projectile penetration reduction The shock numerical test model obtained a high G value wide pulse shock waveform. The invention is applicable to the design of shock wave waveforms of various standards, has short design period, convenient design method and high efficiency.

The invention relates to a simulation test device for cleaning and executing parts of a sanitation vehicle and a supporting structure thereof. The sanitation vehicle cleaning execution part simulation test device includes a support structure for supporting and installing the corresponding cleaning execution parts, and also includes a hydraulic system. The hydraulic system includes a hydraulic power part and a control valve group part. The sanitation vehicle cleaning execution part simulation test device also includes according to the corresponding A console that outputs a control signal to the corresponding control valve in the control valve group section under test conditions. Through the sanitation vehicle cleaning execution part simulation test device, the corresponding cleaning execution parts are installed and supported on the support structure, and the corresponding hydraulic system is configured. During the test, the installation and operation of the cleaning execution parts on the whole vehicle can be effectively simulated. environment, increase the reliability of the test results, and do not need to install the cleaning execution components on the vehicle for simulation tests, which can reduce the test preparation time and shorten the test cycle.