초록 ▼

A system for real time identification of modes of oscillation includes a sensor, an observer, a controller and an actuator. The sensor senses a controlled system such as a combustor, and generates a signal indicative of the modes of oscillation in the controlled system. For example, these modes of o

A system for real time identification of modes of oscillation includes a sensor, an observer, a controller and an actuator. The sensor senses a controlled system such as a combustor, and generates a signal indicative of the modes of oscillation in the controlled system. For example, these modes of oscillation can be combustion instabilities. The observer receives the signal from the sensor, and uses the signal to determine modal functions and frequencies of the modes of interest with a pair of integrals with changing time limits. The controller receives the modal functions and frequency for each mode of interest from the observer, and effects a gain and phase shift for each mode. Based on the modal functions, the frequency, the gain and the phase shift, the controller generates and outputs a control signal, that is supplied to the actuator. The actuator controls the modes of oscillation of the controlled system, based on the control signal. The system of this invention can be used to damp or enhance oscillation modes of the controlled system, depending upon whether the oscillation modes are beneficial or detrimental to system performance.

대표청구항 ▼

[ We claim:] [1.] A method for real time identification of mode of oscillation of a system, the method comprising the steps of:a) sensing the system to generate a signal f(t);b) determining values of modal functions a(t) and b(t), based on a pair of integrals .intg..PSI..sub.a f(t)dt and .intg..PSI.

[ We claim:] [1.] A method for real time identification of mode of oscillation of a system, the method comprising the steps of:a) sensing the system to generate a signal f(t);b) determining values of modal functions a(t) and b(t), based on a pair of integrals .intg..PSI..sub.a f(t)dt and .intg..PSI..sub.b f(t)dt, respectively, .PSI..sub.a and .PSI..sub.b being predetermined wavelet functions that are orthogonal and localized at an estimated frequency .omega. of the mode of oscillation and a(t) and b(t) describing the amplitude of oscillations of signal f(t), the pair of integrals having limits of integration based on a time t and an estimated period T=2.pi./.omega. of the mode of oscillation, the estimated frequency .omega. being predetermined initially;c) determining an updated value of the estimated frequency .omega., .omega. being the frequency of the mode of oscillation based on the modal functions a(t) and b(t); andd) updating the wavelet functions .PSI..sub.a and .PSI..sub.b, based on the updated value of the estimated frequency .omega.; evaluating the wavelet functions to identify the modes of oscillation.