YOU Jing-jing, LI Cheng-gang, WU Hong-tao etc. Error and fault-tolerant processing of parallel type six-axis accelerometer[J]. Editorial Office of Optics and Precision Engineering, 2015,23(9): 2522-2532
YOU Jing-jing, LI Cheng-gang, WU Hong-tao etc. Error and fault-tolerant processing of parallel type six-axis accelerometer[J]. Editorial Office of Optics and Precision Engineering, 2015,23(9): 2522-2532 DOI: 10.3788/OPE.20152309.2522.
Error and fault-tolerant processing of parallel type six-axis accelerometer
the error characteristics and fault-tolerance strategy of a parallel type six-axis accelerometer were researched. By introducing an aided angular velocity and using quaternion to describe rotation parameters in a four-dimensional space
two explicit recursive formulas with simple forms were obtained
and six-axis accelerations were entirely decoupled. By analyzing the decoupling mechanism
three kinds of error sources affecting the decoupling precision were obtained
and the reasons that cause the error were analyzed. By establishing the mapping relations between the error of aided angular velocity
source errors and output errors
the analytical expressions of the basic error equations were derived
and then the influence rules of error components were revealed. The verification experiment shows that the mathematical results are well consistent with the simulation ones in ADAMS
and the relative error between them is acceptable. Three force coordination equations were derived by establishing the hidden deformation compatibility conditions of elastomeric topological configuration
and then a fault-tolerant processing scheme was proposed to solve 93 combined failures. Experimental results indicate that the maximum relative error is 8.5% after using the new algorithm to decouple the six-axis acceleration of the systems with partial failures
which meets the accuracy requirements. Above results verify that the influence rules of errors and the scheme of fault-tolerant processing are both correct and feasible
and also demonstrate that the parallel type six-axis accelerometer has some level of robustness.
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references
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