This heavily revised second edition continues the first edition¿s dual focus on the mathematical and practical aspects of measuring vibrations, making it an invaluable reference for professionals working with vibration measurement. The book is divided into two parts. Part one considers engineering vibrations in order of increasing complexity, from free and forced vibrations of single-degree-of-freedom systems, multiple-degree-of-freedom systems and continous systems, to stochastic processes and random vibrations. Part two deals specifically with the measurement of vibrations in real-world applications, illustrating the main ideas involved in the measurement process and providing guidelines and suggestions on how to accomplish this task by electronic means. A comprehensive description of the required hardware is provided. Now includes new material on vibration isolation in MDOF systems, a revised chapter on probability and statistics and new material on stochastic processes, digital filtering and, digital signal processing. Technological aspects have been brought up to date with the latest developments in the field, including details on the most recent sensors made in MEMS (Micro-Electro-Mechanical Systems) silicon-based technology.