CN103292956A - Device and method for calibrating rotational inertia - Google Patents
Device and method for calibrating rotational inertia Download PDFInfo
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- CN103292956A CN103292956A CN2013102529636A CN201310252963A CN103292956A CN 103292956 A CN103292956 A CN 103292956A CN 2013102529636 A CN2013102529636 A CN 2013102529636A CN 201310252963 A CN201310252963 A CN 201310252963A CN 103292956 A CN103292956 A CN 103292956A
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Abstract
The invention relates to a device and a method for calibrating rotational inertia and belongs to the inertia measuring technical field. The device comprises a banded grating (1), an upper air floating plate (2), a grating reading head (3), a support (4), a lower air floating plate (5), a signal collection and processing system (6), a table board (8) and a base (9). The device and the method for calibrating the rotational inertia enable the rotational inertia to be calibrated.
Description
Technical field
The present invention relates to a kind of device and method for the calibration moment of inertia, belong to the inertia field of measuring technique.
Background technology
Moment of inertia is one of mass property parameter of object.In the control to moving object, moment of inertia is the tolerance of object its inertia when rotating, and it is the intrinsic mass property parameter of object, corresponding rotating shaft position when the size of object rotation inertia depends on its quality and mass distribution and rotational motion.
For regular shape, the uniform object of mass distribution, can calculate the size of its moment of inertia exactly.For the object of out-of-shape or non-uniform mass, has only the size of measuring moment of inertia by experiment.
Rocking platform for the general employing of measurement of large-sized object moment of inertia at present measures.Principle of work is: with an external force axle back that rotates a certain angle is discharged, whole axle ties up under the effect of torsion spring the cycle of doing and rocks.Can be expressed as according to the Newton's law cycle:
Wherein: T---rock the cycle
J---tested moment of inertia
J
0---the moment of inertia of test platform
K---torsion constant
Go out T by a series of experimental measurement, calculate the K of system, and J
0, then the moment of inertia of testee can be expressed as:
As can be seen T measure accurately whether, will directly affect the measuring accuracy of moment of inertia.
At present for hunting period T measurement generally adopt near switch or Hall element, less when pendulum angle, owing to the design feature of element own, can't accurately measure the vibration period.
Summary of the invention
The purpose of this invention is to provide a kind of device and method for the calibration moment of inertia.
The objective of the invention is to be achieved through the following technical solutions.
A kind of device for the calibration moment of inertia of the present invention comprises strip grating (1), goes up air supporting plate (2), read head (3), support (4), therapeutic method to keep the adverse qi flowing downward kickboard (5), signal acquiring processing system (6), table top (8) and the base (9) of grating;
Be followed successively by base (9), therapeutic method to keep the adverse qi flowing downward kickboard (5) from top to bottom, go up air supporting plate (2) and table top (8); Base (9) is fixedlyed connected with therapeutic method to keep the adverse qi flowing downward kickboard (5), between therapeutic method to keep the adverse qi flowing downward kickboard (5) and the last air supporting plate (2) one deck air film is arranged; Be fixedly connected between last air supporting plate (2) and the table top (8); Testee (7) is placed on table top (8) and goes up and fix;
Strip grating (1) is attached to the circumference side of air supporting plate (2), and the read head of grating (3) is fixed on therapeutic method to keep the adverse qi flowing downward kickboard (5) circumference side by support (4); Signal acquiring processing system (6) reads the signal of the read head (3) of grating.
A kind of method for the calibration moment of inertia of the present invention, step is: strip grating (1) is attached to air supporting plate (2) circumference side, the read head of grating (3) utilizes support (4) to be installed in the circumference side of static therapeutic method to keep the adverse qi flowing downward kickboard (5), and the output signal of read head (3) is given signal acquiring processing system (6); Strip grating (1), its groove number is no less than 100 lines/mm.Adjust gap (0.1～0.15) mm of read head (3) and belt grating (1), when relatively rotating between last air supporting plate (2) and the therapeutic method to keep the adverse qi flowing downward kickboard (5), make read head (3) output signal normal.Testee (7) is installed on the table top (8), and table top (8) is fixedlyed connected with last air supporting plate (2).Therapeutic method to keep the adverse qi flowing downward kickboard (5) is fixedly mounted on the base (9).
Signal acquiring processing system (6) is gathered the output signal of reading head (3), through filtering, demodulation process, obtain the signal that air supporting plate (2) rocks, this signal is a periodic signal that the signal period is constant, amplitude decays gradually, in 5～10 cycles of measuring-signal, a plurality of cycles are averaged obtain the time T of rocking that to measure.
Beneficial effect
The present invention can calibrate moment of inertia.
Description of drawings
Fig. 1 is the structural representation of device of the present invention.
Embodiment
Strip grating (1) is attached to air supporting plate (2) circumference side, and the read head of grating (3) utilizes support (4) to be installed in the circumference side of static therapeutic method to keep the adverse qi flowing downward kickboard (5), and the output signal of read head (3) is given signal acquiring processing system (6).Strip grating (1), its groove number is no less than 100 lines/mm.Adjust gap (0.1～0.15) mm of read head (3) and belt grating (1), when relatively rotating between last air supporting plate (2) and the therapeutic method to keep the adverse qi flowing downward kickboard (5), make read head (3) output signal normal.Testee (7) is installed on the table top (8), and table top (8) is fixedlyed connected with last air supporting plate (2).Therapeutic method to keep the adverse qi flowing downward kickboard (5) is fixedly mounted on the base (9).
Signal acquiring processing system (6) is gathered the output signal of reading head (3), through processing such as filtering, demodulation, obtain the signal that air supporting plate (2) rocks, this signal is a periodic signal that the signal period is constant, amplitude decays gradually, in 5～10 cycles of measuring-signal, a plurality of cycles are averaged obtain the time T of rocking that to measure.
A kind of device for the calibration moment of inertia, as shown in Figure 1, the read head (3), support (4), therapeutic method to keep the adverse qi flowing downward kickboard (5), signal acquiring processing system (6), table top (8) and the base (9) that comprise strip grating (1), last air supporting plate (2), grating;
Be followed successively by base (9), therapeutic method to keep the adverse qi flowing downward kickboard (5) from top to bottom, go up air supporting plate (2) and table top (8); Base (9) is fixedlyed connected with therapeutic method to keep the adverse qi flowing downward kickboard (5), between therapeutic method to keep the adverse qi flowing downward kickboard (5) and the last air supporting plate (2) one deck air film is arranged; Be fixedly connected between last air supporting plate (2) and the table top (8); Testee (7) is placed on table top (8) and goes up and fix;
Strip grating (1) is attached to the circumference side of air supporting plate (2), and the read head of grating (3) is fixed on therapeutic method to keep the adverse qi flowing downward kickboard (5) circumference side by support (4); Signal acquiring processing system (6) reads the signal of the read head (3) of grating.
A kind of method for the calibration moment of inertia, step is: strip grating (1) is attached to air supporting plate (2) circumference side, the read head of grating (3) utilizes support (4) to be installed in the circumference side of static therapeutic method to keep the adverse qi flowing downward kickboard (5), and the output signal of read head (3) is given signal acquiring processing system (6); Strip grating (1), its groove number is no less than 100 lines/mm.Adjust gap (0.1～0.15) mm of read head (3) and belt grating (1), when relatively rotating between last air supporting plate (2) and the therapeutic method to keep the adverse qi flowing downward kickboard (5), make read head (3) output signal normal.Testee (7) is installed on the table top (8), and table top (8) is fixedlyed connected with last air supporting plate (2).Therapeutic method to keep the adverse qi flowing downward kickboard (5) is fixedly mounted on the base (9).
Signal acquiring processing system (6) is gathered the output signal of reading head (3), through filtering, demodulation process, obtain the signal that air supporting plate (2) rocks, this signal is a periodic signal that the signal period is constant, amplitude decays gradually, in 5～10 cycles of measuring-signal, a plurality of cycles are averaged obtain the time T of rocking that to measure.
By loading the standard object of known moment of inertia, utilize formula (1) to obtain the moment of inertia J of test platform earlier
0Behind the torsion constant K that rocks spring, again testee is placed on the table top, measure the cycle of rocking, according to formula (2), obtain the moment of inertia of testee.
Claims (4)
1. device that is used for the calibration moment of inertia, it is characterized in that: this device comprises strip grating (1), goes up read head (3), support (4), therapeutic method to keep the adverse qi flowing downward kickboard (5), signal acquiring processing system (6), table top (8) and the base (9) of air supporting plate (2), grating;
Be followed successively by base (9), therapeutic method to keep the adverse qi flowing downward kickboard (5) from top to bottom, go up air supporting plate (2) and table top (8); Base (9) is fixedlyed connected with therapeutic method to keep the adverse qi flowing downward kickboard (5), between therapeutic method to keep the adverse qi flowing downward kickboard (5) and the last air supporting plate (2) one deck air film is arranged; Be fixedly connected between last air supporting plate (2) and the table top (8); Testee (7) is placed on table top (8) and goes up and fix;
Strip grating (1) is attached to the circumference side of air supporting plate (2), and the read head of grating (3) is fixed on therapeutic method to keep the adverse qi flowing downward kickboard (5) circumference side by support (4); Signal acquiring processing system (6) reads the signal of the read head (3) of grating.
2. according to claim 1 a kind of for the device of calibrating moment of inertia, it is characterized in that: strip grating (1), its groove number is no less than 100 lines/mm.
3. according to claim 1 a kind of for the device of calibrating moment of inertia, it is characterized in that: the read head of grating (3) is 0.1～0.15mm with the gap of strip grating (1).
4. method that is used for the calibration moment of inertia is characterized in that step is:
1) by loading the standard object of known moment of inertia, utilize formula (1) to obtain the moment of inertia J of test platform earlier
0With the torsion constant K that rocks spring;
2) testee (7) is installed on the table top (8); Strip grating (1) is attached to air supporting plate (2) circumference side, and the read head of grating (3) utilizes support (4) to be installed in the circumference side of static therapeutic method to keep the adverse qi flowing downward kickboard (5), and the output signal of the read head of grating (3) is given signal acquiring processing system (6); When relatively rotating between last air supporting plate (2) and the therapeutic method to keep the adverse qi flowing downward kickboard (5), the read head of grating (3) output signal is normal;
Signal acquiring processing system (6) is gathered the output signal of read head (3), through filtering, demodulation process, obtain the signal that air supporting plate (2) rocks, 5～10 of measuring-signal cycles then, periodic signal averaged obtain the period T of rocking that to measure, according to formula (2), obtain the moment of inertia of testee;
Described formula (1) is:
Described formula (2) is:
Wherein, T is the cycle of rocking; J is the testee moment of inertia, J
0Be the moment of inertia of test platform, K is torsion constant.
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| CN2013102529636A CN103292956A (en) | 2013-06-24 | 2013-06-24 | Device and method for calibrating rotational inertia |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776958A (en) * | 2015-04-17 | 2015-07-15 | 长春理工大学 | Calibrating and testing method of accuracy of polar moment of inertia |
| CN105203259A (en) * | 2015-09-25 | 2015-12-30 | 哈尔滨工业大学 | Aircraft simulation air bearing table inertia regulating and measuring device and method |
| CN106323547A (en) * | 2016-06-20 | 2017-01-11 | 中国航空工业集团公司北京长城计量测试技术研究所 | Rotating shaft system rotational inertia in-situ measurement device |
| CN106768271A (en) * | 2016-12-06 | 2017-05-31 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measuring method based on fiber grating |
| CN108871673A (en) * | 2018-07-16 | 2018-11-23 | 中国汽车工程研究院股份有限公司 | Commercial-vehicle cab mass center and rotation inerttia modification method |
| CN109556787A (en) * | 2018-11-15 | 2019-04-02 | 北京航天计量测试技术研究所 | A kind of rotary inertia calibrating installation and method |
| CN109813496A (en) * | 2019-03-26 | 2019-05-28 | 北京卫星环境工程研究所 | Plane air-float rotary inertia test desk calibration method |
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| JPS6071931A (en) * | 1983-09-28 | 1985-04-23 | Natl Aerospace Lab | Measuring device of moment of inertia |
| CN101038226A (en) * | 2007-02-15 | 2007-09-19 | 哈尔滨工业大学 | Air-float rotary inertia experimental bench |
| JP2009133709A (en) * | 2007-11-30 | 2009-06-18 | Seiko Instruments Inc | Measuring device, measuring method, adjustment system, and adjustment method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776958A (en) * | 2015-04-17 | 2015-07-15 | 长春理工大学 | Calibrating and testing method of accuracy of polar moment of inertia |
| CN105203259A (en) * | 2015-09-25 | 2015-12-30 | 哈尔滨工业大学 | Aircraft simulation air bearing table inertia regulating and measuring device and method |
| CN106323547A (en) * | 2016-06-20 | 2017-01-11 | 中国航空工业集团公司北京长城计量测试技术研究所 | Rotating shaft system rotational inertia in-situ measurement device |
| CN106323547B (en) * | 2016-06-20 | 2018-11-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Rotary axis rotary inertia in-situ measurement device |
| CN106768271A (en) * | 2016-12-06 | 2017-05-31 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measuring method based on fiber grating |
| CN106768271B (en) * | 2016-12-06 | 2019-06-25 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measurement method based on fiber grating |
| CN108871673A (en) * | 2018-07-16 | 2018-11-23 | 中国汽车工程研究院股份有限公司 | Commercial-vehicle cab mass center and rotation inerttia modification method |
| CN108871673B (en) * | 2018-07-16 | 2019-07-30 | 中国汽车工程研究院股份有限公司 | Commercial-vehicle cab mass center and rotation inerttia modification method |
| CN109556787A (en) * | 2018-11-15 | 2019-04-02 | 北京航天计量测试技术研究所 | A kind of rotary inertia calibrating installation and method |
| CN109813496A (en) * | 2019-03-26 | 2019-05-28 | 北京卫星环境工程研究所 | Plane air-float rotary inertia test desk calibration method |
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Application publication date: 20130911 |