CN105004297A - Measuring method for spatial variation of test sample - Google Patents

Abstract

The invention discloses a measuring method for the spatial variation of a test sample. The method includes: firstly, a plurality of measuring nodes are selected at the test sample, and the internal spatial value of the test sample before a test can be obtained; then the displacement variations of each node in the X, Y and Z directions are measured by employing conventional guyed displacement sensors of a test room, the internal spatial value of the test sample after the test can be obtained via the displacement variations of each measuring node; and finally, the internal spatial variation of the test sample is calculated and obtained. According to the measuring method, measured parameters are analyzed, the intensity and rigidity performance indexes of the test sample can be determined, the method is simple and effective, and the accuracy is high.

Description

A kind of testpieces spatial variations measuring method

Technical field

The present invention relates to a kind of testpieces spatial variations measuring method, be applied in aircraft structure strength process of the test and test parameter testing field.

Background technology

In process of the test, the parameter measurement of testpieces under loaded state is a very important sport technique segment, carries out analyzing the strength and stiffness performance index can determining testpieces to measuring the parameter obtained.The method that present stage use is measured in test is as follows: on testpieces, paste foil gauge carry out strain measurement; Stay-supported or rod-type displacement transducer is utilized to carry out linear movement measuring.In certain model aircraft fuselage overturning process of the test, the variable quantity in cabin interior space in process of the test is needed to obtain according to testing requirements, testing laboratory's present stage does not possess the technological means and relevant device that directly obtain spatial variations amount, therefore exploitation one is needed to utilize existing equipment, by measuring the test parameters of some nodes, these parameters are calculated, finally obtains the inner space variable quantity of testpieces.

Therefore, need to provide a kind of new technical scheme to solve the problems referred to above.

Summary of the invention

The technical issues that need to address of the present invention are to provide a kind of testpieces spatial variations measuring method.

For solving technical matters of the present invention, the technical solution used in the present invention is:

A kind of testpieces spatial variations measuring method, it comprises the following steps:

Before test, needing to measure on the testpieces of inner space, choose several measurement points, choose intersection point or intermediate position points, obtain X, Y, Z three-dimensional coordinate of each measurement point, utilize 3 d modeling software, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of inner space;

In process of the test, stay-supported type displacement sensor is arranged in X, Y, Z tri-directions of measurement point, along with test progressively loads, testpieces deforms, measurement point produces displacement, this value feeds back on the displacement transducer in three directions, obtains each nodes X, Y, Z tri-direction displacement variable;

Test laggard row data processing, by each measurement point original coordinates and displacement variable, carry out geometric superposition, calculate X, Y, Z three-dimensional coordinate of the rear each measurement point of test, utilize 3 d modeling software equally, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of the rear inner space of test;

By above-mentioned steps obtain testpieces before the test with test after the volume of inner space, difference is carried out to two volumetric quantities, the inner space variable quantity of testpieces can be obtained.

Beneficial effect of the present invention: utilize testing laboratory's existing equipment, by measuring the test parameters of some nodes, these parameters are calculated, finally obtain the inner space variable quantity of testpieces, carry out analyzing the strength and stiffness performance index can determining testpieces to measuring the parameter obtained, the method is simple effective again, and accurate rate is high.

Accompanying drawing explanation

Fig. 1 is several measured node chosen on testpieces, at X, Y, Z tri-direction change in displacement spirograms.

Fig. 2 is testpieces inner space numerical value figure before the test.

Fig. 3 is testpieces inner space numerical value figure after experiment.

Embodiment

Below in conjunction with the drawings and specific embodiments, the invention will be further described.Following examples, only for illustration of the present invention, are not used for limiting the scope of the invention.

A kind of testpieces spatial variations measuring method of the present invention, first as shown in Figure 1, before test, needing to measure on the testpieces of inner space, choosing several measured node, choosing intersection point (as in Fig. 11 ^#point) or intermediate position points (as in Fig. 17 ^#point), obtain X, Y, Z three-dimensional coordinate of each measurement point, utilize 3 d modeling software, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of inner space;

In process of the test, stay-supported type displacement sensor is arranged in X, Y, Z tri-directions of measurement point, along with test progressively loads, testpieces deforms, measurement point produces displacement, this value feeds back on the displacement transducer in three directions, obtains each nodes X, Y, Z tri-direction displacement variable;

Test laggard row data processing, by each measurement point original coordinates and displacement variable, carry out geometric superposition, calculate X, Y, Z three-dimensional coordinate of the rear each measurement point of test, utilize 3 d modeling software equally, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of the rear inner space of test;

By above-mentioned steps obtain testpieces before the test with test after the volume of inner space, difference is carried out to two volumetric quantities, the inner space variable quantity of testpieces can be obtained.

Its actual principle: testpieces forms framework by multiple continuous print node, and then be combined into a complete structure, each node be determined by X, Y, Z tri-coordinates, in process of the test, stay-supported type displacement sensor can record X, Y, Z tri-direction variable quantities of each node, obtain the coordinate of test each node rear, by three dimensional joint element software, analog computation is carried out to the practical structures of testpieces, the inner space of testpieces can be obtained.

A kind of testpieces spatial variations measuring method of the present invention, first choose several measured node testing on part, testpieces inner space numerical value (see figure 2) before the test can be obtained, the existing stay-supported type displacement sensor of recycling testing laboratory measures each nodes X, Y, Z tri-direction displacement variable, by the displacement variable of each measured node, the inner space numerical value (see figure 3) testing rear testpieces can be obtained, finally calculate the inner space variable quantity of testpieces.Carry out analyzing the strength and stiffness performance index can determining testpieces to measuring the parameter obtained, the method is effective simply again, and accurate rate is high.

Claims (1)

1. a testpieces spatial variations measuring method, is characterized in that, it comprises the following steps:

Before test, needing to measure on the testpieces of inner space, choose several measurement points, choose intersection point or intermediate position points, obtain X, Y, Z three-dimensional coordinate of each measurement point, utilize 3 d modeling software, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of inner space;

In process of the test, stay-supported type displacement sensor is arranged in X, Y, Z tri-directions of measurement point, along with test progressively loads, testpieces deforms, measurement point produces displacement, this value feeds back on the displacement transducer in three directions, obtains each nodes X, Y, Z tri-direction displacement variable;

Test laggard row data processing, by each measurement point original coordinates and displacement variable, carry out geometric superposition, calculate X, Y, Z three-dimensional coordinate of the rear each measurement point of test, utilize 3 d modeling software equally, set up the three-dimensional digital-to-analogue of inner space, recycling software build-in function directly obtains the volume of the rear inner space of test;

By above-mentioned steps obtain testpieces before the test with test after the volume of inner space, difference is carried out to two volumetric quantities, the inner space variable quantity of testpieces can be obtained.