Machine generated contents note: 1. Equivalent single degree of freedom system and free vibration; 2. Vibration of a single degree of freedom system under constant and purely harmonic excitation; 3. Responses of a SDOF spring-mass-damper system to periodic and arbitrary forces; 4. Vibration of two degrees of freedom systems; 5. Finite and infinite )continuous( dimensional systems; References; Appendix A; Appendix B; Appendix C