2 results about "Chi-squared distribution" patented technology

This invention relates to the field of nuclear safety equipment testing technology. It provides a method for optimizing parameters in accelerated reliability testing of nuclear safety-grade valves. The method involves the following steps: establishing a correlation model between accelerated stress and life parameters; calculating the acceleration factor and formulating an initial test plan; deriving the theoretical sample size based on the success-failure test method combined with confidence requirements; constructing an extended coefficient table using the range-extended test method to optimize test parameters; generating multiple accelerated test plans through chi-square distribution verification; eliminating plans that do not meet the life characteristic threshold; determining the optimal sample size, number of failures, and test cycle through comprehensive test cost and risk analysis; and finally outputting a complete test plan including the action interval time. This method solves the problems of limited test samples, insufficient failure data, low confidence levels, and difficulty in adapting accelerated models in existing high-reliability valve technologies.

The application provides a GNSS outlier detection method, system and storage medium based on residual multi-order chi-square distribution used on a satellite, comprising the following steps: step one, acquiring the position, velocity and satellite time in the earth-fixed system output by the GNSS; step two, converting the output data of the GNSS into orbital 14 plane roots; step three, calculating the residual and the residual rate of change to make a first heavy outlier judgment, then calculating one-dimensional chi-square test outliers, then calculating two-dimensional chi-square test outliers after the one-dimensional chi-square test is passed, calculating five-dimensional chi-square test outliers after the two-dimensional chi-square test is passed, if all the tests are passed, updating the parameters; if one test is not passed, determining that it is an outlier, and simultaneously counting the continuous invalid times, when the continuous invalid times are greater than a threshold value, the threshold value is adjusted along with the increase of the continuous invalid times, so that the system divergence is avoided. The application has the beneficial effects that the application can obviously improve the rejection rate of outliers, and provides correct data for the use on the satellite.