College;
of;
Mechanical;
Science;
and;
Engineering,;
Nanling;
Campus,;
Jilin;
University,;
Changchun;
130025,;
China;
College;
of;
Mechanical;
Science;
and;
Engineering,;
Nanling;
Campus,;
Jilin;
University,;
Changchun;
130025,;
China;
College;
of;
Mechanical;
Science;
and;
Engineering,;
Nanling;
Campus,;
Jilin;
University,;
Changchun;
130025,;
China;
School;
of;
Mechanical;
Engineering;
and;
Automation,;
Northeastern;
University,;
Shenyang;
110004,;
China;
random; parameters,; nonlinear; vibration; systems,; reliability,; statistical; fourth-moment; technique,; maximum; entropy; theory,; incomplete; probability; information.;