School of Mathematical Sciences and LPMC,Nankai University,Tianjin 300071,China;
College of Science,Civil Aviation University of China,Tianjin 300300,China;
School of International Trade and Economics,University of International Business and Economics,Beijing 100029,China;
Stochastic; wave; equations; non-Gaussian; Levy; processes; exponential; stability; second; momen; tstability;