Flexible pendulous accelerometer 8 positions proving installation
Technical field
The present invention relates to flexible pendulous accelerometer 8 positions proving installation, belong to accelerometer Precision Survey Technology field.
Background technology
Flexible pendulous accelerometer is the inertia type instrument that is widely used in "Long March" series of carrier rockets, and accurately acceleration responsive, that measure carrier rocket flight is its basis of carrying out inertial navigation and inertial guidance.Precision and stability is the accurately key of sensitivity, measurement rocket flight acceleration of flexible pendulous accelerometer.
In order to guarantee the precision and stability of flexible pendulous accelerometer, repeatability precision while requiring accelerometer to carry out a state, pendulum state 8 positions rollover test in gravity field between each position≤1 rad, accelerometer carries out door, the inclined to one side value of pendulum state 8 positions rollover test and all require≤6E-05 of moon stability of constant multiplier in gravity field.Classic method is used two-axle rotating table flexible pendulous accelerometer to be carried out in gravity field to a state, pendulum state 8 positions rollover test, all needs first to adjust turntable while testing consistent with machinery, the electrical null position of accelerometer at every turn, causes the testing procedure complexity; In addition, circuit signal between accelerometer and testing apparatus need be by the switching of turntable conducting slip ring, therefore introduced maximum error item---the turntable high power device electromagnetic interference signal in the test, this interference all makes a big impact to the inclined to one side value of the flexible pendulous accelerometer of small-signal and constant multiplier precision.Use two-axle rotating table to carry out the 8 positions rollover test to flexible pendulous accelerometer, not only production cost is high, and the method for operating complexity, and test error is large, causes the accelerometer production cycle to lengthen, qualification rate is low.
At present, "Long March" series of carrier rockets are in high density launch mission period, quantity and precision to flexible pendulous accelerometer have all proposed high requirement, therefore, the retrofit testing method, effectively realize that flexible pendulous accelerometer repeatedly, accurately carries out door in gravity field, pendulum state 8 positions rollover test becomes the key that accelerometer is produced.
Summary of the invention
The objective of the invention is in order to propose flexible pendulous accelerometer 8 positions proving installation.
The objective of the invention is to be achieved through the following technical solutions.
Flexible pendulous accelerometer 8 positions proving installation of the present invention, this device comprises hexahedron pedestal, heat-insulation layer, four cylinders, two tommys, ceramic ring and three attachment screws;
Five faces are arranged as reference field in six faces of described hexahedron pedestal, the surface of reference field is milled with respectively groove, forms 20 boss locating surfaces; The another one face is non-reference field, there is the mounting hole of accelerometer at its center, heat-insulation layer is arranged in mounting hole, there is ceramic ring on the top of mounting hole, ceramic ring is connected and fixed by three attachment screws and hexahedron pedestal, two dowel holes are arranged on ceramic ring, and two tommys stick with glue knot in dowel hole, and tommy is for the accelerometer zero set; Three through holes are arranged on ceramic ring, and through hole extends in the hexahedron pedestal, and through hole extends to the interior part of hexahedron pedestal with internal thread, for fastening accelerometer is installed; Also have the mounting hole of four cylinders on non-reference field, four cylinders are adhesive in mounting hole; The plane of four cylinder compositions is for providing the 6th reference field of hexahedron pedestal; The upper reference field of ceramic ring is consistent with the precision of the 6th reference field of hexahedron pedestal.
The mutual parallel or vertical precision of described 20 boss locating surfaces is not more than 2 μ m;
The 6th reference field that described four cylinders form is not more than 2 μ m with the parallel or vertical precision of boss locating surface;
The locating surface that described two tommys form is not more than 2 μ m with the parallel or vertical precision of six reference fields;
The upper reference field of described ceramic ring is not more than 2 μ m with the parallel or vertical precision of six reference fields;
The vertical precision of the locating surface of the upper reference field of described ceramic ring and two tommy compositions is not more than 2 μ m.
Beneficial effect
The present invention can replace complicated dynamo-electric turret plant to use by accurate installation location and hexahedron structure design fully, effectively realize that flexible pendulous accelerometer repeatedly, accurately carries out door, pendulum state 8 positions rollover test in gravity field, guarantees the precision and stability of flexible pendulous accelerometer;
While using device to test of the present invention, can once instrument accurately be limited to the zero-bit of test, six high-precision reference fields of hexahedral apparatus can be realized the accurate location of flexible pendulous accelerometer in eight positions such as door state, pendulum states, the appliance circuit signal directly passes into testing apparatus, method of operating is simple, measuring accuracy is high, can accurately reflect the precision and stability of flexible pendulous accelerometer.
The accompanying drawing explanation
The structural representation that Fig. 1 is device of the present invention;
The vertical view that Fig. 2 is device of the present invention;
The structural representation that Fig. 3 is the hexahedron pedestal;
The structural representation that Fig. 4 is ceramic ring;
The cut-open view that Fig. 5 is ceramic ring.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
Flexible pendulous accelerometer 8 positions proving installation, this device comprises hexahedron pedestal 1, heat-insulation layer 2, four cylinders 3, two tommys 4, ceramic ring 5 and three attachment screws 6;
Five faces are arranged as reference field in six faces of described hexahedron pedestal 1, the surface of reference field is milled with respectively groove, forms 20 boss locating surfaces 9; The another one face is non-reference field, there is the mounting hole 7 of accelerometer at its center, heat-insulation layer 2 is arranged in mounting hole 7, there is ceramic ring 5 on the top of mounting hole 7, ceramic ring 5 is connected and fixed by three attachment screws 6 and hexahedron pedestal 1, two dowel holes are arranged on ceramic ring 5, and for two tommys 4 are installed, tommy 4 is for the accelerometer zero set; Three through holes 8 are arranged on ceramic ring 5, and through hole 8 extends in hexahedron pedestal 1, and through hole 8 extends to the interior part of hexahedron pedestal 1 with internal thread, for fastening accelerometer is installed; Also have the mounting hole of four cylinders 3 on non-reference field, the plane of four cylinder 3 compositions is for providing the 6th reference field of hexahedron pedestal 1; The upper reference field of ceramic ring 5 is consistent with the precision of the 6th reference field of hexahedron pedestal 1.
The method of testing of utilizing above-mentioned device to carry out the flexible pendulous accelerometer 8 positions is:
1) degree of will speed up meter is arranged in ceramic ring 5, and accelerometer is embedded in the mounting hole 7 of accelerometer, and the installed surface of accelerometer tightly is attached on the upper reference field of ceramic ring 5, and the locating surface of accelerometer tightly leans against on two tommys 4 simultaneously; Being axially fixed on hexahedron pedestal 1 by through hole 8 degree of will speed up meters with screw;
With accelerometer, the orientation along pendulum state, zero acceleration is placed on the zero level flat board device that 2) accelerometer will be housed, make one of them side reference field of this device be adjacent to the reference field on the zero level flat board, the cable of degree of will speed up meter is connected with the cable of testing apparatus simultaneously;
3) to the testing apparatus energising, by cable, to accelerometer, switch on; When the temperature of accelerometer reaches working temperature, the output data of first pendulum state position of testing acceleration meter;
4) this device is carried out to 90 ° of upsets in the pendulum state, read the output data of second pendulum state position of accelerometer, carry out in the same way again 90 ° of upsets, read the output data of the 3rd pendulum state position of accelerometer, carry out in the same way again 90 ° of upsets, read the output data of the 4th pendulum state position of accelerometer;
5) this device is turn to accelerometer door state, place in the orientation of zero acceleration, make one of them side reference field of this device be adjacent to the reference field on the zero level flat board simultaneously, read first state position output data of accelerometer, carry out in the same way again 90 ° of upsets, read the output data of second door state position of accelerometer, carry out in the same way again 90 ° of upsets, read the output data of the 3rd door state position of accelerometer, carry out in the same way again 90 ° of upsets, read the output data of the 4th door state position of accelerometer, thereby complete accelerometer pendulum state and the test of door state 8 positions separation coefficient.
While using this device to test flexible pendulous accelerometer, can be fast, accurately degree of will speed up meter is limited to the zero-bit of test, not only method of operating is simple, and the electromagnetic interference (EMI) of introducing can effectively avoid the test of dynamo-electric turntable the time, measuring accuracy is high, can accurately reflect the precision and stability of flexible pendulous accelerometer.