C. Hansen – Active Control of Noise and Vibration (Second edition, 2012)

Автор: C. Hansen
Название книги: Active Control of Noise and Vibration
Формат: PDF
Жанр: Механика
Страницы: 1560
Качество: Изначально компьютерное, E-book

Since the publication of the first edition, considerable progress has been made in the development and application of active noise control (ANC) systems, particularly in the propeller aircraft and automotive industries. Treating the active control of both sound and vibration in a unified way, this second edition of Active Control of Noise and Vibration continues to combine coverage of fundamental principles with the most recent theoretical and practical developments. What's New in This Edition Revised, expanded, and updated information in every chapter Advances in feedforward control algorithms, DSP hardware, and applications Practical application examples of active control of noise propagating in ducts The use of a sound intensity cost function, model reference control, sensing radiation modes, modal filtering, and a comparison of the effectiveness of various sensing strategies New material on feedback control of sound transmission into enclosed spaces New material on model uncertainty, experimental determination of the system model, optimization of the truncated model, collocated actuators and sensors, biologically inspired control, and a discussion of centralised versus de-centralised control A completely revised chapter on control system implementation New material on parametric array loudspeakers, turbulence filtering, and virtual sensing More material on smart structures, electrorheological fluids, and magnetorheological fluids Integrating the related disciplines of active noise control and active vibration control, this comprehensive two-volume set explains how to design and implement successful active control systems in practice. It also details the pitfalls one must avoid to ensure a reliable and stable system

Over the fourteen years since publication of the first edition, considerable progress has
been made in the development and application of ANC systems, particularly in the
propeller aircraft industry. Inroads have also been made in the automotive industry with
several vehicles boasting ANC systems but none providing any performance data. In fact,
it is very difficult to find performance data for any commercial systems. The development
of a universal ANC system that can be installed and operated by non-expert personnel in a
range of applications remains an elusive goal. There is no doubt that this goal will be
achieved some day but we may need even more processing power than is currently
available in DSP technology to enable this to happen. In parallel, we will also need the
investment of considerable funds to support the labour needed for this development.
The intention of this book is the same as the first edition: that is, to include the most
recent theoretical and practical developments, while at the same time devoting
considerable space to fundamental principles that will not become outdated with time.
Thus, much of the book is similar to the first edition but a considerable amount of new
material has been added to reflect the advances that have been made in algorithms, DSP
hardware and applications.
The Chapter 1 overview has been updated to reflect the current state of the art at the
time of writing. The fundamentals material in Chapter 2 is largely unchanged, although
the section on acoustic intensity has been updated. The spectral analysis material of
Chapter 3 has been updated in a minor way, and the modal analysis material of Chapter 4
has been updated in line with advances in this field. Chapter 5 is largely unchanged but
Chapter 6 has a considerable number of additions, including multi-channel waveform
synthesis, nine variations of the FXLMS algorithm for various applications, new methods
for determining the cancellation path impulse response or transfer function, a more
comprehensive discussion of adaptive filtering in the frequency domain, the lattice form
of the IIR filter, a wider ranging discussion of the use of IIR filters, and performance
estimation procedures for a particular arrangement of control sources and error sensors.
Chapter 7 now includes some practical application examples, including active/passive
mufflers and a discussion of practical problems that are associated with industrial
installations. Chapter 8 now includes material on the use of a sound intensity cost
function, model reference control, sensing radiation modes, modal filtering and a
comparison of the effectiveness of various error sensing strategies. Chapter 9 includes
new material on feedback control of sound transmission into enclosed spaces with
particular application to launch vehicles and material on the use of active vibration control
to reduce sound transmission into flexible-walled enclosures. Chapter 10 has been slightly
updated but remains largely unchanged. Chapter 11 includes a considerable amount of
new material on model uncertainty, experimental determination of the system model,
optimisation of the truncated model, collocated actuators and sensors, biologically
inspired control and a discussion of centralised versus de-centralised control. Chapter 12
has been updated with new material and Chapter 13 has been completely rewritten.
Chapter 14 has been considerably expanded to include new material on parametric array
loudspeakers, turbulence filtering and virtual sensing. The smart structures part of
Chapter 15 has been considerably expanded to reflect the considerable amount of work
that has been published recently in this area.