Multi-channel out-of-sync pulse count compensation method based on cascaded adaptive notch filter

Abstract

The invention discloses a multi-path desynchronous pulse counting compensation method based on a cascading adaptive trap wave device. The method comprises the following steps a Liu type adaptive trap wave LANF with a zero-self-adaption factor is fixed on the front end; an LANF output is input into a Mohsen type adaptive trap wave device MANF; frequency is estimated by the MANF and the LANF is adjusted in real time; a cascading method is employed and the adaptive trap wave devices are fixed to form a cascading adaptive trap wave device SANF; the SANF is applied to multi-path desynchronous pulse counting compensation; and a phase position of a recurrent pulse at any steady state and relative compensation counting value can be acquired. The multi-path desynchronous pulse counting compensation method based on the cascading adaptive trap wave device solves problems that an LANF can only process sinusoidal signals, the MANF deviates from a periodic track while processing recurrent pulse input signal state variables, transient response is affected by input signal amplitude and large steady-state error exists in frequency estimation; non-sine periodic signals can be processed and multi-path desynchronous counting compensation can be conducted; and counting precision is effectively improved.

Description

Technical field [0001] The invention relates to the field of flowmeter pulse counting compensation, in particular to a multi-channel asynchronous pulse counting compensation method based on a cascaded adaptive notch filter. Background technique [0002] With the development of modern industry, the demand for flow meters continues to increase, especially pulse output flow meters (when the flow field is stable, the instantaneous flow rate of pulse output flow meters is proportional to the pulse frequency) has been used unprecedentedly, which is significant for its rapid and accurate verification. major. A universal verification device, the industrial computer drives the commutator according to the phase-locked signal of the flowmeter pulse signal, which can intercept the pulse signal of the flowmeter in a whole cycle. However, in the station device, the measurement accuracy requirements of the pulse count of the flowmeter of each station in multiple stations cannot be guaranteed. ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned existing problems and defects, the present invention provides a multi-channel asynchronous pulse count compensation method based on cascaded adaptive notch filters, which solves the problem that LANF can only process sinusoidal signals, and MANF processes periodic pulse input signal states The variable time deviates from the periodic orbit, the transient response is affected by the amplitude of the input signal, and the steady-state error of frequency estimation is large. It can not only process non-sinusoidal periodic signals and perform multi-channel asynchronous pulse counting compensation, but also effectively improve the counting accuracy.

Images