[The study of active noise control method for noisy surgery tools].

Noise problem is encountered in many types of surgery, especially in orthopaedic surgery, where the cutting tool and its actuation part such as motor always generates big noise. This work is dedicated to developing a novel and promising solution based on the active noise control (ANC) technology to solve the noise problem in an orthopaedic theatre. The development process began with building an engineering evaluation model (EEM) to analyze the specifics of sound interactions and sound field involved in the noise problem. This model can describe the acoustic problem in a straightforward way, help to design a good control system and furthermore to assess the result and to optimize the control structure. Then the "auto position tracking near head space ANC" strategy was proposed from the model study. Furthermore, the real sound field measurement experiment proved the possibility of proposed design.