Innovation in lifetime prediction of rigid polyurethane foam through random vibration and comparison with conventional methods oleh Ming-Kun Shuai, Yi Gong, Fan Cheng, Jian Zhang, Rong-Bo Li, Jie Pan, Na Li, Jian-Feng Xu, Xiao-Qiang Liu, Xiao-Lei Yang, Xue-Lian Xu, Chao-Chao Sun, Hong-Fu Feng, You-Xue Su