Strain Sensor Placement For Deformation Of Antenna Structures

Truss structure has a wide range of applications in large antennae, in order to usestrain sensor to measure antenna deformation displacement, this paper presents athorough study of the key problem of strain sensor arrangement.First of all, in order to reduce calculation and improve the efficiency of thealgorithm, this paper puts forward two kinds of mode number optimization methods,namely modal coordinate method and information matrix coordinates method. A modenumber optimization is performed for ANSYS models of8m antenna.Secondly, the paper introduces the measurement plan: matrix mapping method, i.e.,based on the relationship between strain and displacement, deformation displacement ofantennae could be indirectly measured with strain sensors. Two kinds of sensor layoutmethods are introduced: effective independent method and effective independentdriving point residual methods which are implemented in MATLAB. The orthogonalityamong strain modes are proved in the paper, which provides basis for the applicabilityof the strain sensors.Again, sensor position configuration analysis is carried out for the models of8mand7.3m antennae with effective respectively independent method and effectiveindependent driving point residual method. Then, verify the feasibility and practicabilityof the algorithm.At last, error factors and parameters factors of sensor placement are analyzed.Error factors include modal error, error of measurement and test load displacementstrain error; Parameter factors include sensor number and correlation coefficient LDC.