CN87208361U - Table type rotating inertia measurer for torsional pendulum - Google Patents
Table type rotating inertia measurer for torsional pendulum Download PDFInfo
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- CN87208361U CN87208361U CN 87208361 CN87208361U CN87208361U CN 87208361 U CN87208361 U CN 87208361U CN 87208361 CN87208361 CN 87208361 CN 87208361 U CN87208361 U CN 87208361U CN 87208361 U CN87208361 U CN 87208361U
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- rotating inertia
- table type
- microcomputer
- measurer
- measuring
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Abstract
The utility model discloses a new rotating inertia measurer, comprising a plane volute spring, a sensor, a positioning mechanism, a timing circuit and a microcomputer, characterized in that the rotating inertia measurer is composed of a table type torsion pendulum and an intelligent rotating inertia measurer, the rotating inertia measurer can measure the rotating inertia that the object winds the arbitrary given rotary axle. The utility model has higher measuring accuracy (the measuring error is smaller than 1 percent), having high speed (the measuring period is smaller than 3 seconds), having favorable stability, and having convenient operation.
Description
The utility model relates to a kind of novel moment of inertia testing apparatus device, particularly a kind of table type torsional pendulum moment of inertia testing apparatus.
Moment of inertia is measured by U.S. army at present, adopts monofilament to rock and time-measuring gauge.In this method,, therefore has higher precision owing to adopt monofilament to rock, its measuring error is 1%, is determining instrument constant with least square method, and measurement result is carried out corrections such as temperature, angle, and after the temperature compensation measure, its measuring error can be reduced to below 0.5%.But also there is following problem: 1. must guarantee the determinand center of gravity on instrument rotating shaft extended line when measuring, so it can only survey the moment of inertia that determinand is walked around the center of gravity rotating shaft; 2. for keeping the determinand center of gravity on instrument rotating shaft extended line, must carefully regulate the position of determinand, therefore comparatively inconvenience of operation.Domestic existing a kind of by rocking that band shaft frame and plane scroll spring etc. are formed, it links to each other with time-measuring gauge, measures the cycle, obtains moment of inertia by calculating then.But it can only survey the moment of inertia that object is walked around the center of gravity rotating shaft.
The purpose of this utility model is the problem that exists at above-mentioned prior art, provide a kind of can be directly rapidly, comparatively accurately and easily Measuring Object around the testing tool of any given rotating shaft moment of inertia.
The utility model is achieved in that it comprises plane scroll spring, detent mechanism, sensor and timekeeping circuit, microcomputer etc.It is characterized in that being connected with plane scroll spring, and form table type torsional pendulum with sensor, detent mechanism with the platform of band rotating shaft.Timekeeping circuit joins together with microcomputer as a peripheral hardware of microcomputer, and by the power supply of many groups stabilized voltage supply, forms intelligent rotational inertia testing device.The table type torsional pendulum of this device is connected with lead as the physical parameter transducer of intelligent rotational inertia testing device.During measurement, object under test is placed on the platform, reverses platform, and fix with detent mechanism, make platform that the initial angle displacement be arranged, free platform, make it torsional oscillation, sensor is converted to electric impulse signal with vibration signal, deliver to timekeeping circuit, when timekeeping circuit is surveyed, carry out data acquisition, computing by microcomputer then under system controlled by computer, obtain a result at last.The utility model only need consider during measurement whether the rotating shaft of determinand center of gravity parallel with the instrument rotating shaft, needn't consider whether overlap owing to adopt table type torsional pendulum, thus it can Measuring Object around the moment of inertia of any given rotating shaft.In order to improve the measuring accuracy of this system, adopted following measure: (1) uses detent mechanism on the table type torsional pendulum device, guarantees the consistance of each measuring condition, accidental error when reducing to survey and the systematic error of being forbidden generation owing to crystal oscillator; (2) in timekeeping circuit, adopt precision comparator, improve sensitivity when surveying; (3) importation in timekeeping circuit, separately employings ± 15V stabilized voltage supply is powered, and with the isolated from power of microcomputer and other circuit, improved the stability and the antijamming capability of instrument; (4) adopt microcomputer to carry out intelligent measuring, shortened measuring period, indirect measurement is directly changed.
The utility model compared with prior art, its principal feature is can measure irregularly shaped object around the moment of inertia of giving dead axle arbitrarily, and measuring accuracy is higher (under situation about not revising, compare with the calibrated bolck theoretical value, its measuring error is less than 1%), measuring speed is fast, and good stability is easy and simple to handle.
Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.
Fig. 1 is the table type torsional pendulum structural representation.
Fig. 2 is the theory diagram of intelligent rotational inertia testing device.
Below in conjunction with accompanying drawing the utility model is further described:
Table type torsional pendulum shown in Figure 1 mainly is made up of band rotating shaft platform 1, plane scroll spring 2, detent mechanism 3, bracing frame 4, solid bearing 5, base 6 and illuminated photoelectric sensor.Illuminated photoelectric sensor is made up of the logical light aperture in light source 7, phototriode 8 and the rotating shaft.The inner of plane scroll spring 2 is connected with rotating shaft on the platform 1, the outer end is fixed on the inboard of bracing frame 4, solid bearing 5 is fixed on the rotating shaft of platform 1 in the bracing frame 4, bracing frame 4 is contained on the base 6, sensor is in bracing frame 4, its light source 7 and phototriode 8 are contained in the rotating shaft both sides of platform 1 respectively, and detent mechanism 3 is installed in the outside of bracing frame 4.
Intelligent rotational inertia testing device shown in Figure 2, it comprises timekeeping circuit 9, microcomputer 10, organizes stabilized voltage supply 11 more.Timekeeping circuit 9 mainly is made up of input circuit, precision comparator, Schmidt trigger, periodicity counter, control gate and Z80 Counter Timer Circuit etc.Microcomputer 10 mainly is made up of Z80 main frame, light-emitting diode display, printer, keyboard etc.Many group stabilized voltage supplys 11 by+5V ,+6V, ± the 15V four-way power supply forms.Timekeeping circuit 9 is powered to timekeeping circuit 9 and microcomputer 10 by many groups stabilized voltage supply 11 as the peripheral hardware of microcomputer 10.
The utility model is widely used in scientific research, the production fields such as space flight, aviation, weapons, machinery, motor, clock and watch, sewing machine and biomethanics, has great practical value.
Claims (1)
- A kind of novel moment of inertia testing apparatus, it comprises plane scroll spring 2, detent mechanism 3, sensor and timekeeping circuit 9, microcomputer 10 etc., it is characterized in that being connected with plane scroll spring 2 with the platform 1 of band rotating shaft, and form table type torsional pendulums with sensor, detent mechanism 3 etc., timekeeping circuit 9 is as a peripheral hardware of microcomputer, join together with microcomputer 10, and power by many groups stabilized voltage supply, form intelligent rotational inertia testing device, table type torsional pendulum is connected with intelligent rotational inertia testing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87208361 CN87208361U (en) | 1987-05-19 | 1987-05-19 | Table type rotating inertia measurer for torsional pendulum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87208361 CN87208361U (en) | 1987-05-19 | 1987-05-19 | Table type rotating inertia measurer for torsional pendulum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87208361U true CN87208361U (en) | 1988-03-23 |
Family
ID=4823645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87208361 Withdrawn CN87208361U (en) | 1987-05-19 | 1987-05-19 | Table type rotating inertia measurer for torsional pendulum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87208361U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269086A (en) * | 2014-09-16 | 2015-01-07 | 四川大学 | Torsional pendulum rotational inertia tester with angle scale |
-
1987
- 1987-05-19 CN CN 87208361 patent/CN87208361U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269086A (en) * | 2014-09-16 | 2015-01-07 | 四川大学 | Torsional pendulum rotational inertia tester with angle scale |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |