41results about How to "Avoid experiment" patented technology

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 .