Abstract
Based on the step-stress accelerated life test and the laser strap-down inertial navigation system, this paper studies the accelerated life model and the test method, provides the likelihood function, the likelihood equation and the two-order derivative when the stress level is k, evaluates the effectiveness of the method with the simulation test model established by MATLAB, applies the research findings in the storage reliability study of the XX laser strap-down inertial navigation system, and puts forward an effective evaluation method of the storage life of the inertial navigation system.
Highlights
Laser strap-down inertial navigation system (Hereinafter referred to as the system) is a navigation technology that converts measurement signals transmitted by inertial measurement units on air vehicles into navigation parameters
Rekunov D A et al introduced a miniature tri-axial laser gyroscope (TLG)M-40 [2]; Kuznetsov A G et al took into account the design of LSINS from two precision grades [3]; Yuanzheng Liu et al studied the reliable ignition technology of laser gyroscope [4]
The type-I step-stress accelerated life test is adopted on account of the high reliability of LSINS, fast products update and short test time
Summary
Laser strap-down inertial navigation system (Hereinafter referred to as the system) is a navigation technology that converts measurement signals transmitted by inertial measurement units (gyroscope and accelerometer) on air vehicles into navigation parameters. As an ideal device and an important component of the strap-down inertial navigation system, laser gyroscope percepts changes of the direction of an air vehicle by maintaining the same rotation axis direction of its own so as to send out signals and determine the attitude of the air vehicle For this reason, the reliability analysis and service life prediction have become an important issue of the reliability study of LSINS. This paper carries out a study on the evaluation method of the service life of LSINS by designing a step-stress accelerated storage life test and verifies the effectiveness of the method through the MATLAB numerical simulation analysis It applies the research findings in the XX laser strap-down inertial navigation system. This method can be used in the evaluation of the storage life of LSINS and provides an effective reference for the service life evaluation of other inertial systems
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