This Third Edition of the well--received engineering text retains the clarity of exposition that made the previous editions so popular, and contains the most widely--used problem sets in the business. Approach to vibration analysis is clear, concise, and simple, backed up by a wealth of problems and examples. Multi--degree--of--freedom problems are well--prefaced with two--degree--of--freedom cases. There is a special treatment of damping, including non--viscous problems (standard texts make much use of viscous damping, but most practical examples are not viscous). Now includes an excellent development of Rayleigha s principle and an introduction to finite element vibration analysis. Contains 100 new problems.