Vold-Kalman Filter

Vold-Kalman Order Tracking Filter Type 7703 allows high-performance tracking of harmonic responses, or orders, of periodic loads in mechanical and acoustical systems. This method allows the beat-free extraction of close and crossing orders in systems with multiple axles, and possesses a finer frequency and order resolution than conventional techniques. The tracking capabilities are independent of the rate of change of the rotational speed (slew rate).

Combined with other elements of the PULSE Order analysis package, the Vold-Kalman filter allows a very detailed investigation of all types of order phonomena, regardless of operating conditions.

Uses

• Amplitude and phase of first order for multiplane balancing and foundation diagnoses of industrial rotors
• Amplitude and phase for operating deflection shapes per order
• Separation of drive shaft orders from wheel orders in suspension tuning
• Isolation of order interaction phenomena in subjective sound quality studies
• Separation of sinusoids from broadband noise

Features

• Post-processing operations on any number of channels at any sampling rate
• Order extraction as phase assigned order or order waveform as a function of time
• Order extraction independent of the rate of change of rotational speed (slew rate)
• No phase bias in time domain waveform extraction
• Separation of interacting orders in multi-shaft systems overcoming beat phenomena
• Ultra-fine tracking resolution in absolute bandwidth or constant percentage bandwidth
• 1-, 2- and 3-pole filter shapes
• RPM profile (RPM versus time) estimation using least squares cubic splines giving accurate instantaneous RPM
• Repair of RPM profile in cases of tacho signal dropouts
• Hinge points in RPM profile allowing for, for example, gear shifts
• Playback of order waveform through a sound card