Reliability Design Of High Precision Attitude Sensor

Reliability is a design factor that must be emphasized in the triturating of equipment. With the development of science and technology, demand of battlefield to the quickly dispatched ability and mobility of equipment is becoming higher and higher, thus the reliability issue comes under more attention. As the updating product of the traditional mechanical gravity Tilting attitude measurement system, performance of the attitude sensor can fully meet the requirements of equipment; however, a new product, its reliability issue still need some research.Firstly, the overview of electronic product reliability research at home and abroad are introduced, also reliability design emphasis of attitude sensor are summarized, and some reliability design methods are sketched in this paper. Then based on the reliability theory, reliability block diagram and reliability mathematical model of attitude sensor are built, and reliability prediction implemented according to the electronic equipment reliability prediction manual is in order to guide the quality control of components; Later, the failure mode effects analysis is carried out to the attitude sensor system, which helps to determine direction of the design. The analysis and improvement of the mechanical part, the electronic circuit portion, and a software portion are respectively carried out as follows:(1) The error mathematical models of machining and installation are built, the error effects on the calibration of attitude sensor is also analyzed, and a new calibration methods is presented that can decrease the calibration error by one more order of magnitude. Next, the electromagnetic seal design and conductive oxide measures of resistance to hot and humid environment are taken for shell; according to the carrier vibration parameters, the natural frequencies and modes of the shell are analyzed by the finite element analysis software, which ensure its reliability in high vibration environments.(2) In order to improve the ability of the system to survive in electromagnetic environment, EMC measures such as Filter design, PCB design, grounding design and electromagnetic shielding and so on, are adopted in electronic circuit part; soon after, based on shell design data, anti-vibration design is taken into circuit module, the result of which analyzed by finite element analysis software meets demand; finally, the effects of temperature and humidity environment on electronic circuit are analyzed, and improved design are carried out from many aspects, such as the election of components, installation location, assembly technology and so on.(3) Many reliability design methods adopted in the software design process of attitude sensor are introduced, such as error avoiding design, troubleshooting design and error correction design, fault-tolerant design, which improve the reliability of the system software.Finally, high and low temperature humid hot test, the vibration impact test and the electromagnetic compatibility test on attitude sensor are done; the results of three confirmatory tests indicate that the reliability design measures adopted in this paper are overall feasible.