CN103095259A

CN103095259A - Timely supplement and correction processing method for missing pulse signals

Info

Publication number: CN103095259A
Application number: CN 201110344179
Authority: CN
Inventors: 邵永松
Original assignee: ZHENJIANG RUNXIN TECHNOLOGY INFORMATION Co Ltd
Current assignee: ZHENJIANG RUNXIN TECHNOLOGY INFORMATION Co Ltd
Priority date: 2011-11-04
Filing date: 2011-11-04
Publication date: 2013-05-08

Abstract

In the extensive processes of testing and analyzing performance of engines and rotating machinery, the rotation speed is an indispensable measurement parameter, and rotation speed information is mostly generated by a magneto. The situation that rotation speed pulse angle signals are frequently missed under effects of external interference or noise of a test system, and the situation can have great effects on performance analysis of the engines and the rotating machinery with an instantaneous rotation speed used as a reference; and less serious cases affect analysis precision greatly, serious cases can result in failure of a test, and the condition is not allowed to occur in the test and is even a fatal shortcoming. Therefore, a method for solving the problem of pulse missing needs to be found. For the problem of the pulse missing during data acquisition, an algorithm and an implementation process for missed pulse supplement and correction are analyzed in detail. By means of the supplement and correction method, supplement processing of analog sampling signals in various missing situations can be achieved, and the supplement and correction method has great significance to instantaneous rotation speed analysis, rotating machinery failure analysis and the like.

Description

Omitting the real-time revisal of pulse signal processes

Technical field

The present invention relates to a kind of real-time revisal processing method of omitting pulse signal.

Background technology

In engine and rotating machinery performance test analysis process widely, rotating speed is an indispensable measurement parameter, and rotary speed information is produced by magneto mostly.During magneto work, the double wedge of signal rotor changes with the air seam of iron core, and the magnetic flux by sensor coil is changed, and causes producing in coil the angle pulse signal of induction.Rotating speed is namely in catch end, signal to be carried out the AD sample mean to process, then obtains through overvoltage-physical transformation.

Be subjected to external interference or test macro noise effect; the situation that the tacho-pulse angle signal often can be lost; this is concerning utilizing transient speed to carry out for benchmark the analysis of engine performance and rotating machinery performance; has suitable impact; the lighter is the precision of impact analysis greatly; serious situation causes the failure tested, this be test do not allow or even fatal defective.For this reason, must find the method that solves the pulse missing problem.

Summary of the invention

At present for corresponding this kind situation, in test or the whole periodic signal that will lack angle pulse lose and disregard, perhaps increase the mechanical precision of angle signal generator, perhaps increase testing circuit at collection terminal, find the situation of omission, self produces the revisal pulse signal.First method has caused the decline of measuring accuracy, and the serious situation test of information dropout can't be carried out.Second method can't guarantee the complete of interior signal of each cycle.The third method has increased circuit deals with problems, but the also corresponding redundancy that has increased cost and system.

Utilize the real-time pulse signal to omit the revisal algorithm, solved the problems referred to above from software, when can dealing with problems fully, do not increase cost and the additional designs of system.

Description of drawings

Fig. 1 is that impulse waveform is made the Shape correction schematic diagram.

Fig. 2 is that periodic signal is made counter-rotating processing schematic diagram.

Fig. 3 is that angle signal is made counter-rotating processing schematic diagram.

Fig. 4 is that periodic signal is made merging processing schematic diagram.

Fig. 5 is that angle signal is made merging processing schematic diagram.

Fig. 6 is that periodic signal width and angle signal width are isometric, and periodic signal is than angle signal delay disposal schematic diagram the preceding.

Fig. 7 is that periodic signal width and angle signal width are isometric, periodic signal than angle signal after the delay disposal schematic diagram.

Fig. 8 is that periodic signal is 360 degree, and periodic signal is than angle signal delay disposal schematic diagram the preceding.

Fig. 9 be periodic signal be 360 the degree, periodic signal than angle signal after the delay disposal schematic diagram.

Figure 10 processes schematic diagram for omitting revisal.

Embodiment

The below is elaborated to technical solution of the present invention, but protection scope of the present invention is not limited to described embodiment.

Embodiment:

After capturing the angle signal pulse signal, must do following processing to signal, then look into the loss that sees if there is signal, and then carry out the revisal of lossing signal.

1. Shape correction

2. counter-rotating is processed

3. merge and process

4. delay disposal

5. omission revisal

1. Shape correction:

The original waveform signal is adjusted into square-wave signal, and in this process, elimination 1us is with interior data.As shown in Figure 1.

2. counter-rotating is processed:

(1) periodic signal counter-rotating, as shown in Figure 2.

(2) angle signal counter-rotating, as shown in Figure 3.

3. merge and process:

(1) periodic signal merges (360 degree=＞720 degree), as shown in Figure 4.

(2) angle signal merges, as shown in Figure 5.

4. delay disposal:

(1) periodic signal width and angle signal width are isometric, periodic signal than angle signal front, as shown in Figure 6.

(2) periodic signal width and angle signal width are isometric, periodic signal than angle signal rear, as shown in Figure 7.

(3) periodic signal be 360 the degree, periodic signal than angle signal front, as shown in Figure 8.

(4) periodic signal be 360 the degree, periodic signal than angle signal rear, as shown in Figure 9.

5. omission revisal:

Look into and see if there is the pulse data omission, do following processing, as shown in figure 10.

Claims

1. determine whether the basis that pulsing is lost when porch detects, detect for realizing porch, must carry out the peak extraction of sampling pulse sequence, this paper has proposed two kinds of methods.

2. based on the peak extraction algorithm of curve, sample sequence is got continuously be no less than 3 points, utilize quadratic polynomial or least square method to carry out curve fitting, the polynomial slope of digital simulation, and try to achieve each interval in the maximum of matched curve, obtain a maximum series, wherein the threshold value of each value and appointment compares the peak value sequence that has just obtained a match.

3. based on the peak extraction algorithm of multi-scale wavelet transform, sample sequence is carried out the bior3 discrete wavelet decomposition that yardstick is N, then the details parameter of all levels being carried out zero crossing detects, and the zero crossing during out to out is as an estimation of sample sequence peak value, then carry out the search of peak estimation point on each yardstick, till knowing that the first order has been decomposed, thereby obtain a peak value sequence.

4. behind the position of determining pulse missing, for pulse-losing is compensated, need estimate the maximum number at each possible pulse-losing in pulse missing place, when carrying out impulse sampling for a system, the Changing Pattern in its pulse spacing is constant on statistical significance, if the pulse point is spacedly distributed, in the situation that sequence does not have pulse missing, its TOA difference will occur with 100% fixed value; If the pulse point is non-being spacedly distributed, in the situation that sequence does not have pulse missing, its TOA difference is determined by its unequal interval pulse point.