CN100489445C - Decelerator strain detection testing device and data processing method thereof - Google Patents

Abstract

The invention provides a reducer strain test device and a data processing method and consists of a strain foil, a strain collector, a data processing system that contains a peak-valley processor and a rain-flow counter, a damage and residual life calculator, an alarm buzzer and a display which are all sequentially connected with each other. The data processing method is to paste the strain foil, pre-process the peak-valley, count the rain-flow, calculate the damage and calculate the damage accumulation. The reducer strain test device and the data processing method of the invention have the advantages that a monitoring device has simple structure, small volume, little data memory capacitance, fast data processing speed, high precision, automatic batch processing and the display of data collecting and processing process and result, easy operation and direct installation on a plane, thus pilots can make real-time monitoring and automatic alarm when in flight.

Description

Decelerator strain detection testing device and data processing method

Technical field

The present invention relates to the test and the data processing of speed reduction unit, be specifically related to the strain detection testing device and the data processing method of copter engine speed reduction unit.

Background technology

The lift that helicopter produces when rotating by rotor flies, and the power of rotor rotation is provided by engine, and the power of engine passes on the rotor shaft by speed reduction unit, thereby drives the rotor rotation, and speed reduction unit is the vitals of helicopter.Speed reduction unit is made up of gear train assembly, and it slows down the high rotating speed of engine to satisfy the rotating speed of rotor requirement.Awing speed reduction unit can produce damage, and along with the increase of flying hour, the damage of each part of speed reduction unit is also increasing, and reduce serviceable life gradually.Parts degree of injury and residual life are to obtain and work out on this basis data preservation by experimental calculation and use experience accumulation, and it has stipulated the time interval of safeguarding and the life value that each part of speed reduction unit is provided.Though these data play an important role to the flight that guarantees helicopter, this data does not have versatility.Helicopter for different purposes, different model, increase along with flying hour, the degree of injury of each parts is also different, only rely on data preservation to estimate each important parts degree of injury and residual life of each flight back, parts degree of injury and residual life can not be provided timely and accurately.When especially meeting the special duty of big load, be difficult to ensure that the normal safety of flight carries out.Be to guarantee the safety of flight, improve the attendance rate and the maneuverability of helicopter, it is very important that the degree of injury of each parts of copter engine speed reduction unit and residual life are monitored in real time, and this will have a cover proving installation and a data handling system.

Summary of the invention

The purpose of this invention is to provide a kind of simple in structurely, volume is little, and is easy for installation, simple to operate, can the parts damage of real-time automatic monitoring copter engine speed reduction unit and the decelerator strain detection testing device and the data processing method thereof in life-span.

The present invention realizes above purpose by following technology.

The present invention is by foil gauge, and the strain acquirement device contains the data handling system of peak valley processor and rain-flow counting device, damage and Life Calculation device, and alarm buzzer and display and the proving installation that connects to form successively, the step of its data processing method is as follows:

(1), pastes foil gauge

On detected parts, stick foil gauge, the strain acquirement device obtains the strain size at paster position by foil gauge or at a certain time interval continuously through calibrated magnitude of load, and convert numerical signal to, generation contains the data file of each parts load or strain value, is input to the data handling system that contains peak valley processor and rain-flow counting device;

(2), peak-paddy pre-service

Gather strain data at a certain time interval, the time dependent data point that collects is connected into strain-time history curve, remove the intermediate point between adjacent peak valley, keep the peak valley point;

(3), rain-flow counting

Strain-time coordinate the system that only keeps peak-valley point is turn 90 degrees together with the dextrorotation of course curve, make time coordinate down, the strain coordinate is towards the right side, under new coordinate system, with the absolute value maximum point is cut-point, whole strain-time history curve is divided into two sections, with the two sections transposition, these strain values successively from the inboard of each peak or paddy to the whereabouts, formation rain stream, when the strain value that falls runs into the strain value that falls from the upper strata, stop at once, both finished a cycle count;

According to life formula:

$\frac{S}{S_{\∞}}=H+A{(N+C)}^{-B}$ Obtain the life value of part;

In the formula: S is the alterante stress amplitude

S _∞Be fatigue limit

H, A, B, C are the form parameter of S-N curve

N is and the corresponding destruction period of S value, i.e. life value

(4), damage is calculated:

According to formula $D_i=\frac{1}{N_i}$

In the formula: D _iBe the i time impairment value, Ni is the i time life value, and subscript i represents the i time flight;

(5), damage accumulation calculates

According to formula D=∑ D _i

In the formula: D is the damage accumulation value

When D=1, residual life reduces to zero, and part was changed or repaired to the longevity.

The advantage of decelerator strain detection testing device of the present invention and data processing method is: monitoring device is simple in structure, volume is little, memory data output is few, data processing speed is fast, the precision height, batch processing and video data collection, treatment progress and result are simple to operate automatically, directly be installed on the aircraft, by pilot monitoring in real time and warning automatically when flying.

Description of drawings

Fig. 1 is a decelerator strain detection testing device process flow diagram of the present invention.

Fig. 2 strain is transformation period course figure in time.

Strain changes course figure in time after Fig. 3 peak-paddy pre-service.

Fig. 4 strain is with the cycle index variation diagram.

Among the figure 1, the strain acquirement device, 2, data handling system, 3, the peak valley processor, 4, the rain-flow counting device, 5, damage and Life Calculation device, 6, display, 7, foil gauge, 8, alarm buzzer.

Embodiment

As seen from Figure 1, decelerator strain detection testing device of the present invention and data processing method thereof, by strain acquirement device 1, data handling system 2, damage and Life Calculation device 5, display 6, foil gauge 7, alarm buzzer 8 connects to form proving installation.Data handling system 2 contains peak valley processor 3 and rain-flow counting device 4.The step of its described method is as follows:

(1), pastes foil gauge

Foil gauge 7 is attached on the part of detected speed reduction unit, strain acquirement device 1 (is preserved as the value that every mistake will measure in 0.001 second at a certain time interval by foil gauge 7, the data that 1000 tests of arranging in chronological order will be arranged in 1 second) obtain the strain size at paster position or continuously through calibrated magnitude of load, and convert numerical signal to, generation contains the data file of each parts load or strain value, the time dependent time history diagram of strain (as shown in Figure 2) is input to the data handling system 2 that contains peak valley processor 3 and rain-flow counting device 4;

(2), peak-paddy pre-service

(preserve at a certain time interval as the value that every mistake will measure in 0.001 second, the data that 1000 tests of arranging in chronological order will be arranged in 1 second) gather strain data, the time dependent data point that collects is connected into strain-time history curve, peak valley processor 3 with strain in time transformation period course figure (as shown in Figure 2) remove intermediate point between adjacent peak valley, keep the peak valley point, obtain the time dependent time history diagram of strain, (as shown in Figure 3);

(3), rain-flow counting

Strain-time history diagram (as shown in Figure 3) coordinate dextrorotation that rain-flow counting device 4 will only keep peak-valley point turn 90 degrees, make time coordinate down, the strain coordinate is towards the right side, under new coordinate system, with the absolute value maximum point is cut-point, whole strain-time history curve is divided into two sections, with the two sections transposition, this moment, the value of starting point and terminal point equated, and has maximum absolute value (as shown in Figure 4), these strain values with maximum absolute value successively from the inboard of each peak or paddy to the whereabouts, form rain stream, when the strain value that falls runs into the strain value that falls from the upper strata, stop at once, both finished peak valley round-robin rain-flow counting and handled,, and obtained each round-robin amplitude so repeatedly until finishing all cycle counts;

According to life formula:

$\frac{S}{S_{\∞}}=H+A{(N+C)}^{-B}$ Obtain the life value of part

In the formula: S is the alterante stress amplitude, and its value is for-306---475

S _∞Be fatigue limit, its value is 319.8

H, A, B, C are the form parameter of S-N curve, concentrate with material, technology, stress form, mean stress, stress, factor such as fretting wear is relevant, are determined by test

H is 1.0, and A is 29.84, and B is 0.3316, and C is 12.0

N is and the corresponding destruction period of S value, the i.e. life value of part

(4), damage is calculated:

According to formula $D_i=\frac{1}{N_i}$

In the formula: Di is the i time impairment value, and Ni is the i time life value, and subscript i represents the i time flight;

(5), damage accumulation calculates

The damage accumulation calculating formula

D＝∑D _i

In the formula: D damage accumulation value

When D more than or equal to 0.99 the time, alarm buzzer 8 is reported to the police automatically, and can monitor in real time at display 6 when flight, the part injury of prompting pilot speed reduction unit is serious, has reached lifetime limitation, grounds immediately and carries out maintenance test.

Claims (1)

1, a kind of decelerator strain test data disposal route, it is characterized in that: the step of described method is as follows:

(1), pastes foil gauge

On detected parts, stick foil gauge (7), the strain acquirement device obtains the strain size at paster position by foil gauge or at a certain time interval continuously through calibrated magnitude of load, and convert numerical signal to, generation contains the data file of each parts load or strain value, is input to the data handling system (2) that contains peak valley processor (3) and rain-flow counting device (4);

(2), peak-paddy pre-service

Gather strain data at a certain time interval, the time dependent data point that collects is connected into strain-time history curve, remove the intermediate point between adjacent peak valley, keep the peak valley point;

(3), rain-flow counting

Strain-time coordinate the system that only keeps peak-valley point is turn 90 degrees together with the dextrorotation of course curve, make time coordinate down, the strain coordinate is towards the right side, under new coordinate system, with the absolute value maximum point is cut-point, whole strain-time history curve is divided into two sections, with the two sections transposition, these strain values successively from the inboard of each peak or paddy to the whereabouts, formation rain stream, when the strain value that falls runs into the strain value that falls from the upper strata, stop at once, both finished a cycle count;

According to life formula:

$\frac{S}{S_{\∞}}=H+A{(N+C)}^{-B}$ Obtain the life value of part

In the formula: S is the alterante stress amplitude

S _∞Be fatigue limit

H, A, B, C are the form parameter of S-N curve,

N is and the corresponding destruction period of S value, i.e. life value

(4), damage is calculated:

According to formula $D_i=\frac{1}{N_i}$

In the formula: Di is the i time impairment value, and Ni is the i time life value, and subscript i represents the i time flight;

(5), damage accumulation calculates

According to formula D=∑ D _i

In the formula: D is the damage accumulation value

When D=1, residual life reduces to zero, and part was changed or repaired to the longevity.

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