Design and Testing of the Strain Transducer for Measuring Deformations of Pipelines Operating in the Mining-deformable Ground Environment

Abstract

Design and laboratory test results of the strain transducer intended for monitoring and assessing stress states of pipelines sited in mining areas are presented in this paper. This transducer allows measuring strains of pipelines subjected to external forces -being the mining operations effect. Pipeline strains can have a direct influence on a tightness loss and penetration of the transported fluid into the environment. The original strain gauge transducer was proposed for performing measurements of strains. It allows measuring circumferential strains and determining the value and direction of the main longitudinal strain. This strain is determined on the basis of measuring component longitudinal strains originating from axial forces and the resultant bending moment. The main purpose of investigations was the experimental verification of the possibility of applying the strain transducer for measuring strains of polyethylene pipelines. The obtained results of the transducer subjected to influences of tensile and compression forces are presented and tests of relaxation properties of polyethylene are performed.

Identification and Adjustment of Guide Rail Geometric Errors Based on BP Neural Network

“…With the change of the geometric errors, the relative position of slide blocks in the direction of X and Y will be changed, which leads to the deformation and the stress on the test plate [18]- [19]. But the stress was not evenly distributed.…”

“…Attach the strain gage to the surface of test plate and ensure that the orientation of the strain gage corresponds to the direction shown in Fig.10. Since the experiment was carried out in a constant temperature environment of 20±0.5 °C, no temperature compensation was required [19]. The test plate was moved to the starting position.…”