Type synthesis for sensing mechanism of superconductor gravity gradient based on constraint pattern

Based on constraint pattern, the type synthesis for sensing mechanism of superconductor gravity gradient was produced. The independent sensing mechanism of inline or cross component of gravity gradient was analyzed, and the freedoms of motion and constraint pattern of mechanism were deduced. The simultaneous sensing mechanism of two components was presented for the measurement application. The constraint type was determined by the freedoms of motion and constraint pattern and equivalent to flexible cylinder joint, which could be built by flexible elements according to parallel mechanism form. By means of modal emulation, it can be concluded that rigid rod with flexible spherical hinge on two ends of rod is applicable for the sensing mechanism of two components. The stiffness emulation results indicate that the stiffness of design motion is small, the stiffness of parasitic motion is large, and coupling of motions is little. It is proved that the simultaneous sensing mechanism of two components is appropriate for the measurement system of superconductor gravity gradient.