CN105651512A - Bump detection method of main speed-reducing gear of automobile driving axle - Google Patents

Abstract

The invention discloses a bump detection method of a main speed-reducing gear of an automobile driving axle. The bump detection method comprises the following steps: (1) mounting a vibration acceleration sensor on a box body of the driving axle; mounting a rotary speed pulse sensor at the input end of the driving axle; (2) acquiring a vibration acceleration signal and acquiring an output rotary speed pulse signal; (3) inputting the acquired rotary speed pulse signal of the input end and the vibration acceleration signal into a computer; and (4) converting a vibration-time signal to a vibration-angle position signal by the computer according to the acquired rotary speed pulse signal, and positioning defect parts of the driving axle to be detected by utilizing changes of the rotary vibration signal of the main speed-reducing gear of the driving axle to be detected, and the position information of a corresponding rotary angle. With the adoption of a method for extracting characteristic information of operation healthy conditions by using a vibration signal peak value searching method, wrong judgment and incorrect judgment caused by traditional subjective evaluation on whether the main speed-reducing gear of the driving axle has bump defects or not can be greatly reduced.

Description

A kind of automobile drive axle master subtracts gear enclosed mass detection method

Technical field

The present invention relates to auto NVH (vibration, noise, sound vibration roughness) detection technique field, particularly relate to a kind of automobile drive axle master and subtract gear enclosed mass detection method.

Background technology

Drive axle is an important spare part in automotive transmission, and it carries the transportation work of power, simultaneously also that the noise contribution of car load is bigger. In the work process of drive axle, the exception of any one parts all can cause drive axle operation irregularity, thus causing axle noise or initial failure. For drive axle manufacturing enterprise, the bench detection of drive axle relies primarily on operator and at the noise of bench detection, drive axle is carried out subjective judgment, it is difficult to quantitatively evaluating drive axle operating condition, easily causes misjudgement and erroneous judgement. Simultaneously, because there is no objective vibration test equipment, also bring very big difficulty for fault diagnosis from now on.

The gear teeth face protruding (enclosed mass) caused due to processing and manufacturing precision would generally cause the abnormal vibrations in drive axle operation process, and then can cause that the noise of car load is abnormal, even causes the howling of system. Automobile drive axle howling is the pure tone of a kind of high frequency, is therefore easy to by ear recognition. Along with the reduction of main noise and client's raising to automobile sound quality requirements of automobile, the control of howling is very urgent. After drive axle manufacture has been assembled, it is necessary to effectively identified its vibration and quality of uttering long and high-pitched sounds before it is passed to client. The current technology identifying howling is to investigate its howling in the gear mesh vibration characteristic measuring drive axle on vibration detection stand that rolls off the production line, and compared with detecting with traditional subjectivity by human auditory system, this is more advanced and reliable method. The difficult point of the method is in that how to use a kind of effective vibration signal detection method to extract the characteristic information of measurand.

Summary of the invention

For prior art above shortcomings, it is an object of the invention to provide a kind of automobile drive axle master and subtract gear enclosed mass detection method, utilize the method for vibration signal peak value searching to extract its method running health status characteristic information, it is possible to greatly reduce misjudgement and erroneous judgement that driving bridge main reducing gear is caused with or without enclosed mass defect by tradition subjective assessment.

In order to solve above-mentioned technical problem, the technical solution used in the present invention is such that a kind of automobile drive axle master and subtracts gear enclosed mass detection method, it is characterised in that: comprise the steps:

1) installing vibration acceleration sensor on the casing of drive axle, the input at drive axle installs tacho-pulse sensor;

2) driven the input of drive axle by drive motor, and obtain vibration acceleration signal by vibration acceleration sensor, obtained the rotational speed pulse signal of output by input tacho-pulse sensor;

3) by the input rotational speed pulse signal obtained, vibration acceleration signal through amplifying and input data acquisition unit after Filtering Processing, data acquisition unit after converting analog signals into digital signal, computer is inputted;

4) computer is according to the rotational speed pulse signal obtained, time of vibration signal is converted to vibration angle position signalling, utilizes the rotary angle position information of the change of the vibration signal that driving bridge main reducing gear to be measured rotates and its correspondence to position drive axle rejected region to be measured.

Further, step 4) in, the driving gear of drive axle and the rotary angle position of driven gear are positioned by the tacho-pulse of synchronous acquisition:

P_d=N_p

$P_s=N_p*\frac{N_s}{N_d}$

In formula: P_dDriving gear rotate a circle correspondence tacho pulse number;

P_sDriven gear rotate a circle correspondence tacho pulse number;

N_pDrive end rotate a circle correspondence tacho pulse number;

N_dThe driving gear number of teeth;

N_sThe driven gear number of teeth;

When there is enclosed mass, the exciting that enclosed mass causes, much larger than normal data value, calculates the exciting amplitude that whether there will be formed objects after this gear rotates a circle with the tacho-pulse that this exceptional data point is corresponding, if there is then thinking that enclosed mass occurs in this gear.

Compared with prior art, present invention have the advantage that

1, the automobile drive axle master of the present invention subtracts gear enclosed mass detection method, utilize " short time spikes " in the method search vibration signal of vibration signal peak value searching, these spikes can occur when such as enclosed mass, plaque, peeling, spallation contact with irregular metal, and this phenomenon disappears in traditional frequency spectrum analysis method due to the too small meeting of energy; Meanwhile, if gear has multiple tooth enclosed mass occur simultaneously, common order analysis method is utilized to be difficult to obtain fault message accurately; And the peak value searching detection method that the present invention uses converts vibration angle position signalling to time of vibration signal, utilize and drive axle to be measured is led the angular position information and time signal peak value subtracting gear rotation to position test specimen noise position.

2, the present invention can pass through the operating condition of quantization method objective evaluation drive axle, greatly reduces misjudgement and erroneous judgement that tradition subjective assessment causes, and the quality and the noise failure that subtract for raising automobile drive axle master serve pivotal role.

Accompanying drawing explanation

Fig. 1 is that certain is to driving bridge main reducing gear schematic diagram.

Fig. 2 is the time of vibration signal that driving bridge main reducing gear rotates.

Fig. 3 is the vibration angle position signalling that driving bridge main reducing gear rotates.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described.

Embodiment: a kind of automobile drive axle master subtracts gear enclosed mass detection method, comprises the steps:

1) installing vibration acceleration sensor on the casing of drive axle, the input at drive axle installs tacho-pulse sensor;

2) driven the input of drive axle by drive motor, and obtain vibration acceleration signal by vibration acceleration sensor, obtained the rotational speed pulse signal of output by input tacho-pulse sensor;

3) by (input) rotational speed pulse signal obtained, (drive axle casing) vibration acceleration signal through amplifying and input data acquisition unit after Filtering Processing, after being converted analog signals into digital signal by data acquisition unit, input computer;

4) computer is according to the rotational speed pulse signal obtained, time of vibration signal is converted to vibration angle position signalling, utilizes the rotary angle position information of the change of the vibration signal that driving bridge main reducing gear to be measured rotates and its correspondence to position drive axle rejected region to be measured; Vibration signal is mainly utilized to position test specimen rejected region based on the peak value of angular position information and time signal.

The rotary angle position of driving gear and driven gear can be positioned by the tacho-pulse of synchronous acquisition:

P_d=N_p;

$P_s=N_p*\frac{N_s}{N_d};$

In formula: P_dDriving gear rotate a circle correspondence tacho pulse number;

P_sDriven gear rotate a circle correspondence tacho pulse number;

N_pDrive end rotate a circle correspondence tacho pulse number;

N_dThe driving gear number of teeth;

N_sThe driven gear number of teeth.

If there being enclosed mass on gear, then the accumulation signal of its generation can repeat after a full 360 degrees of rotation, and the angle position that gear rotates can be positioned by rotational speed pulse signal. Find by contrasting the vibration signal of fault data and normal data, when enclosed mass occurs, the exciting that enclosed mass causes is much larger than normal data value (such as Fig. 2), in engineering generally when bag exciting amplitude is more than 3 times of vibration data root-mean-square value, think that vibration data occurs in that exception, then the exciting amplitude that whether there will be formed objects after this gear rotates a circle is calculated with the tacho-pulse that this exceptional data point is corresponding, if there is then thinking that enclosed mass occurs in this gear.

As a kind of detailed description of the invention, referring to Fig. 1, the driving gear number of teeth is 7, and the driven gear number of teeth is 43, and on driving gear, breaking releasing occurs in certain tooth, and enclosed mass occurs in another tooth. Fig. 2 is the time of vibration signal that test obtains, in computer, first time-based vibration signal is converted to the vibration signal based on angle position, then search " short time spikes ", determines exemplar fault message according to source of trouble angle position in rotary course and reproduction number of times. Fig. 3 is the vibration angle position signalling that test obtains, in figure, short time spikes every turn is fixing occurs once, two spike angular relative position in 360 degree are 102.86 degree simultaneously, it is each space of teeth of driving gear (2 times of 1/7*360=51.43), thus may determine that driving gear has two teeth to occur extremely, and these two abnormal tooth mesophase spherule are every a normal tooth in a rotational direction.

Finally it should be noted that, above example is only in order to illustrate technical scheme but not restriction technologies scheme, it will be understood by those within the art that, technical scheme is modified or equivalent replacement by those, without deviating from objective and the scope of the technical program, all should be encompassed in the middle of scope of the presently claimed invention.

Claims (2)

1. an automobile drive axle master subtracts gear enclosed mass detection method, it is characterised in that: comprise the steps:

1) installing vibration acceleration sensor on the casing of drive axle, the input at drive axle installs tacho-pulse sensor;

2) driven the input of drive axle by drive motor, and obtain vibration acceleration signal by vibration acceleration sensor, obtained the rotational speed pulse signal of output by input tacho-pulse sensor;

3) by the input rotational speed pulse signal obtained, vibration acceleration signal through amplifying and input data acquisition unit after Filtering Processing, data acquisition unit after converting analog signals into digital signal, computer is inputted;

4) computer is according to the rotational speed pulse signal obtained, time of vibration signal is converted to vibration angle position signalling, utilizes the rotary angle position information of the change of the vibration signal that driving bridge main reducing gear to be measured rotates and its correspondence to position drive axle rejected region to be measured.

2. a kind of automobile drive axle master according to claim 1 subtracts gear enclosed mass detection method, it is characterised in that: step 4) in, the driving gear of drive axle and the rotary angle position of driven gear are positioned by the tacho-pulse of synchronous acquisition:

P_d=N_p

$P_s=N_p*\frac{N_s}{N_d}$

In formula: P_dDriving gear rotate a circle correspondence tacho pulse number;

P_sDriven gear rotate a circle correspondence tacho pulse number;

N_pDrive end rotate a circle correspondence tacho pulse number;

N_dThe driving gear number of teeth;

N_sThe driven gear number of teeth;

When there is enclosed mass, the exciting that enclosed mass causes, much larger than normal data value, calculates the exciting amplitude that whether there will be formed objects after this gear rotates a circle with the tacho-pulse that this exceptional data point is corresponding, if there is then thinking that enclosed mass occurs in this gear.