u_estimateint.pas

一些数据库的实例。共12章。如第八章： 第8章数据库环境的建立 1. 用MISDBA用户登录MISDB数据库。 2. 在ISQL中

unit u_EstimateInt;
{可靠性参数估计接口}

interface
type
  TSample=record
    Time:Double;
    Failed:Boolean;//失效为True
  end;
  TTimeList=Array of TSample;
  TSampleR=record
    Time:Double;
    R:Double;
  end;
  TSampleRList=Array of TSampleR;
  TPoint=record
    X:Double;
    Y:Double;
  end;
  TPointList=Array of TPoint;

{指数分布密度函数}
function ExpDistf(lambda,t:Double):Double;StdCall;
{指数分布累计函数}
function ExpDistFT(lambda,t:Double):Double;StdCall;
{指数分布点估计}
function ExpDistPointEsti(WorkTime:TTimeList):Double;StdCall;
{威布尔分布密度函数}
function WeibullDistf(beta,eta,gamma,t:Double):Double;StdCall;
{威布尔分布累计函数}
function WeibullDistFT(beta,eta,gamma,t:Double):Double;StdCall;
{威布尔分布累计函数反函数}
function WeibullDistFA(beta,eta,gamma,F:Double):Double;StdCall;
{截尾数据可靠度计算}
function TruncationR(var WorkTime:TTimeList;CalResult:TSampleRList):integer;StdCall;
{最小二乘法直线拟合y=a+bx}
function LeastSquaresFit(PointList:TPointList;var a,b:Double):Double;StdCall;
{二参数威布尔分布点估计-最小二乘估计}
function Weibull2PointEstiLeast(WorkTime:TTimeList;var beta, eta:Double):Boolean;StdCall;

implementation

function ExpDistf; external 'Estimate.dll' name 'ExpDistf';
function ExpDistFT; external 'Estimate.dll' name 'ExpDistFT';
function ExpDistPointEsti; external 'Estimate.dll' name 'ExpDistPointEsti';
function WeibullDistf; external 'Estimate.dll' name 'WeibullDistf';
function WeibullDistFT; external 'Estimate.dll' name 'WeibullDistFT';
function WeibullDistFA; external 'Estimate.dll' name 'WeibullDistFA';
function Weibull2PointEstiLeast; external 'Estimate.dll' name 'Weibull2PointEstiLeast';
function TruncationR; external 'Estimate.dll' name 'TruncationR';
function LeastSquaresFit; external 'Estimate.dll' name 'LeastSquaresFit';

end.