| The 6-DOF motion platform is very important in flight and navigate simulators.The 6-DOF transient motion simulation, such as pitching,yaw,roll and parallel movement in three directions will realized by digital computer controlling,. Motion simulation is based on the motion characteristic of different carriers, such as force->acceleration->velocity->position, moment->angular acceleration->angular velocity->pose, in addition, some infection should be calculated. So the motion simulator could generate the real ship motion, and the motion system and forecast software can be maximum tested and consummated in laboratory.In this years, many transducers be developed and used to control the motion precision, but there aren't any special measure system for the hydraulic pressure 6-DOF motion platform. Sometimes the strapdown inertial navigation system be used, but the measurement data can not image the motion directly. Therefore, the motion synthesis testing system aimed at the parallel 6-DOF simulator is advanced in this dissertationDiffered from current motion measurement, what used in the motion simulation and manipulate system for the 6-DOF platform is the motion parameter of an arbitrary point on the platform, which is reckoned from the acceleration vectors of the characteristic points on the platform. So the sensitive point and axis of the measured line acceleration and angular acceleration should be superposed absolutely, and the referent coordinate should be definit. The dimention sensitivity and coupling factor between the dimentions should be stricted rigidly. The complex acceleration measurement technique can image the motion truthly, confirm the motion state, position and pose track, therefore, become the first parameter needed in the platform controlling system, some low precision navigation fields, etc, and searched by many contries' researchers.The main innovative contributions are as follows:Based on deducing the relation between the acceleration vector of a arbitrary point and the special point's line acceleration and angular acceleration, the particle's line acceleration and angular acceleration, and the acceleration vector ofa arbitrary point can be gained by using the measure system researched in this dissertation. Calculated with the coordinate transform matrix, the acceleration, the velocity integrated at earth coordinate are output..In allusion to the platform motion, a new piezoresistive complex accelerometer's configuration is advanced. The ring type symmetry sensitive structure is analysed, the principle and data catch way is detailed. By constructing the stress collection gap, the parameter can be adjusted easily, and the decoupling is realized. By using the theory of broad board and the combination of flat shell element and 3D solid element, the finite element model of the elastomer is made up. The structure is proved to possess nice sensitivity , nice linearity and little cross coupling. The dynamical characteristic analyse result is presented also.To avoid the bad influence for the system response, the position and pose tracking system based on the one dimention distantion measurement is researched. The existent ultrasonic 3D system can only provide the plat motion information , the ultrasonic device array can track the platform' 6-DOF motion. After experiments, some discipline about the 6-DOF motion tracking under the influence of the motion serve systerm is presented.In allusion to speciality of high resolution, ultra low frequency response ability, the laser interfere absolute calibration and the random signal processing is used to construct a full evaluating scheme. With this scheme, the performances, such as frequence band, damping, dynamic response, sensitivity, cross sensitivity, linearity, etc, are tested completely. Based on the schism result, the platform is tested with regular and random acceleration inspiration, the result shows that the platform and the motion measure system can follow the standard motion and refresh the random acceleration condition.
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