Chapter 1 Introduction 1. 1 Engineering background 1.2 Engineering uncertainties 1.2. 1 Unpredictable loading conditions 1.2.2 Randomness of material properties 1.2.3 Major developments in stochastic finite element methods 1.3 The aim and layout of book 1.3.1 The aim 1.3.2 Book layout Chapter2 Mathematical background 2. 1 Probability theory 2. 1. 1 The development of probability theory. 2.1.2 Probability space 2.1.3 Distribution 2.1.4 Characteristic function 2.1.5 Moments 2. 1.6 Cumulants 2.1.7 Covariance matrix 2.1.8 Entropy 2.1.9 Stochastic convergences 2.1.10 Basic limit theorems and inequities 2.2 Stochastic field 2.2.1 Second-order random field 2.2.2 Mercer's theorem 2.2.3 Stationary random fields 2.2.4 Spectral expansion of stationary random fields 2.2.5 Ergodicity 2.2.6 Gaussian random fields 2.3 Stochastic Analysis 2.3.1 Brownian motion 2.3.2 Stochastic differential equations 2.4 Statistics 2.4.1 Estimation 2.4.2 Preliminary nonparametric statistics Chapter 3 Representation of random fields 3. 1 Constitutive laws 3.2 Stochastic constitutive lairs 3.2.1 The spectral representation method 3.2 2 Karhunen-Loeve expansion method 3.2.3 Other representation methods 3.3 Representation of Non-Gaussian fields …… Chapter 4 Solvers of stochastic linear equations Chapter 5 Aircraft engineering applications Chapter 6 Reliability analysis Chapter 7 Uncertainties in aircraft big data and de-noising technologies Chapter 8 Future directions Index Ⅰ General convention Index Ⅱ Abbreviation Index Ⅲ Symbolic notation