High-precision measurement device and test method for interface pressure distribution of silo test model

Abstract

High-precision measurement device and test method for the interface pressure distribution of a silo test model, including a silo container, a stress measurement device for the bottom / side wall pressure distribution of a particle column in the silo container, and a feeding funnel; the silo container is made of A hollow columnar structure made of transparent material, the stress measurement device includes a strip-shaped flexible stress measurement film symmetrically laid on the inner wall of the silo container, a flexible stress measurement film block pressed on the bottom of the silo container, and connected to the silo container through a data cable. A computer connecting the strip flexible stress measuring film and the flexible stress measuring film block. In the present invention, the entire cross-section including the outer wall of the silo container is placed on the flexible stress measurement film block, so that the pressure distribution result of the full-section high density can be obtained, and the pressure distribution transmitted by the cylinder wall and the particle column in the cylinder can be compared and analyzed respectively. The variation law of pressure eliminates the redistribution of the internal force of the particle system caused by the deformation of the traditional pressure test box, and improves the accuracy of the silo pressure test.

Description

technical field [0001] The invention relates to the field of indoor particulate matter testing, in particular to a high-precision measuring device and a testing method for the interface pressure distribution of a silo test model. Background technique [0002] The "silo effect" refers to the filling of granular materials in the silo to form a particle cylinder. As the height of the cylinder increases, the pressure at the bottom of the particle cylinder gradually tends to a certain saturation value, that is, the weight of the particle cylinder that is subsequently filled. The transmission direction is deflected, no longer transmitted down to the bottom of the column, but gradually transmitted to the silo wall. [0003] Granular materials widely exist in the field of engineering, and it is of great physical and engineering practical significance to fully understand the engineering properties of granular materials. The engineering properties of granular materials are different ...

AI Technical Summary

Problems solved by technology

Traditional pressure measurement needs to obtain the stress from the strain of the measuring instrument itself. The inconsistency of the interface stiffness caused by the deformation of this instrument will lead to changes in the boundary and internal intergranular force distribution of the particle system, which cannot reflect the initial contact force distribution state.

In addition, due to the size limitation of traditional measuring equipment, it is difficult to obtain sufficient force distribution data in small and medium-scale indoor experiments

Due to the limitations of the above-mentioned traditional testing methods, the silo tests conducted in the past mostly discussed the average value of the bottom pressure, and it was difficult to obtain sufficient data on the distribution of the pressure on the bottom surface

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