CN102116669B - Method for eliminating null shift effect of sensor in barycentric test system - Google Patents

Abstract

The invention provides a method for eliminating null shift effect of a sensor in a barycentric test system, comprising the following steps of: 1) measuring and recording tooling mass data before a satellite is hoisted on a barycentric table; 2) recording the data of each sensor at every moment in a whole journey in the whole satellite filling test process; 3) measuring and recording output code value of the sensor after the satellite filling is finished before the satellite is hoisted away from a barycentric measuring table; 4) measuring and recording the output code value of the sensor again after the satellite is hoisted away from the barycentric table; 5) comparing the tooling test data before and after the satellite filling, wherein the data reflects the total null shift of the sensor in the satellite filling process; and correcting the satellite mass and barycentric measurement data according to a comparison result, and obtaining accurate results on satellite mass and barycenter. In the method, a new test process is adopted for the state after the satellite filling, namely a satellite-first tooling-second method; therefore, the test data of the satellite and tooling are the latest-measured results after satellite filling is carried out, so as to eliminate accumulated error brought by null drift of the sensor.

Description

Eliminate the method for sensor drift influence in the barycenter test macro

Technical field

The invention belongs to technical field of sensor measurement in the barycenter test macro, be specifically related to a kind of method of eliminating sensor drift influence in the barycenter test macro.This method can be eliminated in long-time quality, the barycenter test because the test error that the LOAD CELLS drift causes.

Background technology

Need in the high orbit satellite launching site fuel adding process to use the barycenter platform that satellite quality, barycenter situation of change are measured in real time, Measuring Time reached about 10 days.Because the barycenter platform adopts strain-gauge transducer, when using for a long time, sensor itself can produce big drift, can have a strong impact on the measuring accuracy of quality, barycenter like this.To this problem, sensor drift in the barycenter test macro is influenced technology for eliminating study.According to the characteristics of launching site mass property test, with testing software two aspects quality, barycenter measuring technology are carried out improvement from calibration technique and solved this problem, improved measuring accuracy.

Summary of the invention

In order to address the above problem, the invention provides a kind of method of eliminating sensor drift influence in the barycenter test macro.

The present invention has adopted following technical scheme:

A kind of method of eliminating sensor drift influence in the barycenter test macro may further comprise the steps:

1) measures and write down the satellite lifting and go up the preceding frock qualitative data of barycenter platform, the code value when promptly sensor has only the satellite frock on the barycenter platform;

2) the omnidistance data of each sensor that write down in the whole satellite filling test process in each moment;

3) measure and record sensor output code value the general assembly (TW) of corresponding satellite of these data and frock before hanging the barycenter test desk after the satellite filling finishes;

4) satellite remeasures and writes down sensor output code value, the weight data of the corresponding satellite frock of these data after hanging the barycenter platform;

5) the frock test data before and after the filling of contrast satellite, these data have reflected sensor drift value altogether in the satellite filling process; According to comparing result correction satellite quality and barycenter test data, obtain accurately satellite quality and barycenter result (how possibly be the key point of method according to the comparing result correction).

Wherein, said sensor is a strain chip LOAD CELLS;

Preferably, the number of strain chip LOAD CELLS is 3.

The present invention has adopted new testing process, the method for frock behind the promptly first satellite for satellite filling back state.The test data of satellite and frock all adopts the up-to-date result who records in filling back like this, has eliminated the cumulative errors that the sensor drift is brought into.

Description of drawings

Fig. 1 is a LOAD CELLS drift test curve.

Embodiment

Hereinafter is elaborated to the present invention through specific embodiment:

1. strain chip LOAD CELLS screening

Through establishment sensor test data logging software, the data situation under the record sensor heavy burden state has been grasped sensor drift rule.Through grasping sensor drift amount with sensor heavy burden change of time situation, and each sensor arrives the time of little drift duty.Wherein, three-way sensor drift change curve has write down three days drift data of LOAD CELLS carrying among the figure shown in accompanying drawing 1.

Can be known that by test data sheet data shown in Figure 1 first three day drift amount is maximum in the LOAD CELLS load bearing process, the drift variation reduces gradually after three days.Adopt following sensor screening technique thus: after the total system Installation and Debugging, will carry out the appendix test to system according to quality, the barycenter of test specimen; Use software records sensor output data, and draw the sensor output characteristic curve; Select the level and smooth sensor of output characteristic curve, change the curve of output tangible sensor that fluctuates.

2 barycenter station symbols are decided method

According to sensor drift rule, change traditional demarcation technology.Before demarcating barycenter platform sensor coefficient, make sensor heavy burden special time (confirming in advance) make working sensor, and under this state, demarcate sensor coefficient in little drift state according to test.Barycenter platform heavy burden special time (confirming in advance according to test) makes barycenter platform sensor in whole filling process, work in little drift duty all the time before the satellite filling test.

The main points of this work are accurately to hold the time that sensor arrives little drift duty, and make it in whole calibrating and satellite test process, remain this state.Need in the process through great number tested data and according to the different operational version of different sensors customization.

Through using new demarcation technology; Make the instantaneous coefficient of corresponding sensor when calibration coefficient reacts sensor characteristic rather than the short-term test in the barycenter director time service more accurately, thereby improved the measuring accuracy of quality, barycenter in the satellite filling process.

Through the demarcation of screening of strain chip LOAD CELLS and barycenter platform, carry out the step of sensor drift influence in the following elimination barycenter test macro:

1) measures and write down the satellite lifting and go up the preceding frock qualitative data of barycenter test desk, the code value when promptly sensor has only the satellite frock on the barycenter platform;

2) the omnidistance data of each sensor that write down in the whole satellite filling test process in each moment;

3) measure and record sensor output code value the general assembly (TW) of corresponding satellite of these data and frock before hanging the barycenter test desk after the satellite filling finishes;

4) satellite remeasures and writes down sensor output code value, the weight data of the corresponding satellite frock of these data after hanging the barycenter test desk;

5) the frock test data before and after the filling of contrast satellite, these data have reflected sensor drift value altogether in the satellite filling process; According to comparing result correction satellite quality and barycenter test data, obtain satellite quality and barycenter result accurately.

Effect is following:

We adopt conventionally test method and " satellite filling back test " function to measure quality, the barycenter data of satellite filling back end-state respectively in xx-1 satellite filling back, shown in table 1, table 2.

Table 1 conventionally test method data

Data name	Frock	Satellite	Gross weight
				P1(kg)	47.715	1688.854	1736.569
P2(kg)	47.812	1690.025	1737.837
				P3(kg)	47.792	1673.690	1721.482
G(kg)	143.319	5052.568	5195.887
				Yc(mm)	0.075	1.680	------------
Xc(mm)	-0.363	0.831	------------

Table 2 " satellite filling back test " data

Data name	Frock	Satellite	Gross weight
				P1(kg)	48.280	1688.288	1736.568
P2(kg)	49.290	1688.548	1737.838
				P3(kg)	48.774	1672.707	1721.481
G(kg)	146.344	5049.543	5195.887
				Yc(mm)	1.832	1.630	------------
Xc(mm)	-3.081	0.910	------------

Through contrast table 9, table 10, the frock data were because bigger variation had taken place in the sensor drift after last 12 day can to find to place the barycenter platform by satellite, and three sensors change inconsistently, and P1 increases 0.565kg, and P2 increases 1.478kg, and P3 increases 0.952kg.Three sensors 3.025kg that drifts about altogether.Use software to eliminate simultaneously because three inconsistent barycenter test errors that cause of sensor drift.

Claims (3)

1. eliminate the method that the sensor drift influences in the barycenter test macro for one kind, may further comprise the steps:

1) measures and write down the satellite lifting and go up the preceding frock qualitative data of barycenter test desk, the code value when promptly sensor has only the satellite frock on the barycenter test desk;

2) the omnidistance data of each sensor that write down in the whole satellite filling test process in each moment;

3) measure and record sensor output code value the general assembly (TW) of corresponding satellite of these data and frock before hanging the barycenter test desk after the satellite filling finishes;

4) satellite remeasures and writes down sensor output code value, the weight data of the corresponding satellite frock of these data after hanging the barycenter test desk;

5) the frock test data before and after the filling of contrast satellite, these data have reflected sensor drift value altogether in the satellite filling process; According to comparing result correction satellite quality and barycenter test data, obtain satellite quality and barycenter result accurately.

2. the method for claim 1, wherein said sensor is a strain chip LOAD CELLS.

3. method as claimed in claim 2, wherein the number of strain chip LOAD CELLS is 3.

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