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+package com.nationrel.modules.fta.util;
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+
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+import org.apache.commons.math3.distribution.LogNormalDistribution;
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+import org.apache.commons.math3.distribution.NormalDistribution;
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+
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+public class ReliabilityAlgorithmUtil {
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+
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+ /**
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+ * 指数分布可靠度算法
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+ *
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+ * @param lambda
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+ * @param gamma
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+ * @param time
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+ * @return
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+ */
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+ public static double exponentialReliability(double lambda, double gamma, double time) {
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+ // TODO 根据实际情况添加判断
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+ if (lambda <= 0 || time < 0) {
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+ throw new IllegalArgumentException("lambda and x must be positive");
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+ }
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+ return Math.exp(-lambda * (time - gamma));
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+ }
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+
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+ /**
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+ * WEIBULL分布可靠度算法
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+ *
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+ * @param time
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+ * @param beta
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+ * @param eta
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+ * @return
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+ */
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+ public static double weibullReliability(double beta, double eta, double gamma, double time) {
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+ // TODO 根据实际情况添加判断
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+ if (time < 0 || beta <= 0 || eta <= 0) {
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+ return 0;
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+ }
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+ return Math.exp(-Math.pow((time - gamma) / eta, beta));
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+ }
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+
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+ /**
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+ * normal分布可靠度算法
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+ *
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+ * @param time
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+ * @param mean
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+ * @param sigma
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+ * @return
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+ */
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+ public static double normalReliability(double mean, double sigma, double time) {
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+ // TODO 根据实际情况添加判断
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+ if (time < 0 || mean <= 0 || sigma <= 0) {
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+ return 0;
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+ }
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+ NormalDistribution normalDistribution = new NormalDistribution(sigma, sigma);
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+ return 1 - normalDistribution.cumulativeProbability(time);
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+ }
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+
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+ /**
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+ * logNormal分布可靠度算法
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+ *
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+ * @param time
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+ * @param logMean
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+ * @param logSigma
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+ * @return
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+ */
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+ public static double logNormalReliability(double logMean, double logSigma, double time) {
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+ // TODO 根据实际情况添加判断
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+ if (time < 0 || logMean <= 0 || logSigma <= 0) {
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+ return 0;
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+ }
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+ LogNormalDistribution logNormalDistribution = new LogNormalDistribution(logMean, logSigma);
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+ return 1 - logNormalDistribution.cumulativeProbability(time);
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+ }
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+}
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