CN103267609B - Three-line pendulum test stand is adopted object to be carried out to the method for barycenter centering - Google Patents
Three-line pendulum test stand is adopted object to be carried out to the method for barycenter centering Download PDFInfo
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- CN103267609B CN103267609B CN201310153148.4A CN201310153148A CN103267609B CN 103267609 B CN103267609 B CN 103267609B CN 201310153148 A CN201310153148 A CN 201310153148A CN 103267609 B CN103267609 B CN 103267609B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 title claims abstract description 16
- 239000000725 suspension Substances 0.000 claims description 26
- 230000005484 gravity Effects 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 241000272165 Charadriidae Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention provides a kind of flexible tray three-line pendulum test stand.Comprise testing table support, wire rope, force snesor, pallet, guide pipe, clamp nut, studdle, counter weight device etc.Pallet is processed several via holes, via hole can install guide pipe, and be fastened on pallet by clamp nut.Can load studdle in guide pipe, studdle can rotate thus rise or decline in guide pole.Several studdles can form one to testee and effectively support.This three-line pendulum test stand goes for the testee of various shape, and can complete the barycenter centering process of testee fast.
Description
Technical field
The present invention relates to a kind of Moment of Inertia Using Three-line Pendulum Method device field, particularly a kind of Moment of Inertia Using Three-line Pendulum Method stand and utilize this stand to carry out the method for barycenter centering to object.
Background technology
Three-line pendulum test stand is usually used in the moment of inertia measuring rigid body.Such as it may be used for the moment of inertia parameter of measured automobiles engine or power assembly.Three-line pendulum test stand structure common at present equidistantly hangs three wire rope on experiment table support, hangs the pallet of a circular steel plate as testee below.
In experimentation, first need testee to put on pallet, and will ensure that the barycenter of testee is positioned on the axis of pallet.If barycenter is not be positioned on axis, then experimental error can be introduced.
Traditional three-line pendulum has two shortcomings: the first, and the barycenter centering process of testee bothers very much.For the testee as motor car engine, its weight arrives hundreds of kilogram tens usually, usually needs the position of locomotor repeatedly on pallet, and reads the numerical value of pulling force sensor, until the reading of three pulling force sensors is consistent, barycenter centering process just can be completed.This step takes time and effort, and it is more dangerous to operate.The second, testee put inconvenience.If obtain the inertia parameter (i.e. inertial tensor) that an engine is complete, usually need 9 moment of inertia to 12 different axis measuring barycenter, then just can calculate more accurate value.But, an engine be shown 9 to 12 kinds of different attitudes on pallet and but be not easy.In traditional Three-line pendulum test stand, just must can show many attitude to test by stilts such as wooden units.But, add the stilts such as wooden unit, not only can introduce experimental error, and Motor Mass Centre centering process is bothered more and danger.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of Novel three-wire pendulum experiment table is provided, and utilize this experiment table to carry out the method for barycenter centering to object, to solve the problem.
An aspect of of the present present invention provides a kind of Three-line pendulum test stand, comprise support and pallet, described support comprises the upper plane of a level, plane is distributed with three hitch points becoming equilateral triangles to arrange on described, each described hitch point hangs the equal rope of a length respectively, the below of described rope connects described pallet, and each described rope is provided with device for monitoring tension; The geometric center of described equilateral triangle arranges center suspension point, and described center suspension point is also hung with rope; Described pallet offers multiple via hole equably, described via hole can arrange guide pipe, in guide pipe, be provided with adjustable for height studdle.
Preferably, described pallet is circular, and arranges three adjusting screw(rod)s equably in its outer rim, and described screw rod is provided with damper weight, and described damper weight can moving radially along described adjusting screw(rod).
Preferably, the form that described via hole is concentrically justified is evenly distributed on described pallet.
Preferably, on pallet, same each described mistake hole size is circumferentially identical, and the size of same each described guide pipe circumferentially, quality and size are also identical.
Preferably, the via hole relative to described round tray center position symmetry arranges described guide pipe and described studdle.
Preferably, described guide pipe is cylindrical shape, and is inside and outsidely all processed with screw thread, and described guide pipe is fixed on described pallet by external thread and nut, and described studdle can be loaded in guide pipe by screw thread, and regulates bearing height by rotating.
Another aspect of the present invention, provides a kind of and adopts described Three-line pendulum test stand to carry out the method for barycenter centering to object, comprise the following steps:
A. on described round tray, chosen position installs described guide pipe and studdle relative to the centrosymmetric via hole of round tray central point, regulates described round tray to make pallet center of gravity overlapping with geometric center and is positioned at immediately below described center suspension point;
B. use tray supporting devices from below tray support to be got up, and the position again adjusting pallet make pallet center of gravity overlapping with geometric center and is positioned at immediately below described center suspension point;
C. measured object rope is bundled, hang on below center suspension point, and free suspension makes it hover, now the center of gravity of testee is just in time positioned at directly over described pallet;
D. rotate described studdle, make measured object described in multiple described studdle common support;
E. disconnect the rope of described center suspension point, and remove the tray supporting devices below pallet.
Preferably, wherein, before the process of described guide pipe and studdle is installed in step a, also comprises and use tray supporting devices from below tray support, wire rope is not stressed, the step that pallet does not rock.
Preferably, described pallet is regulated to make pallet center of gravity overlapping with geometric center in step a and the process be positioned at immediately below described center suspension point is: to make pallet only by the pulling force of three wire rope, regulate described counterweight, make each described device for monitoring tension reading consistent, namely pallet center of gravity is overlapping with geometric center.
Preferably, the position again adjusting pallet in step b makes pallet center of gravity overlapping with geometric center and the process be positioned at immediately below described center suspension point is: use tray supporting devices from below tray support, and adjust pallet and make its level, described center suspension point hangs a weight, it is made freely to hover, move horizontally tray supporting devices and pallet, the geometric center of pallet is positioned at immediately below weight.
Adopt experiment table of the present invention and barycenter centering method, not only can support the different attitudes of testee easily, the barycenter centering process of testee can once complete simultaneously, without the need to repeatedly moving, thus improves conventional efficient.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of flexible tray Three-line pendulum test stand of the present invention;
Fig. 2 shows the vertical view of flexible tray in the present invention;
Fig. 3 shows the schematic diagram of flexible tray in the present invention;
Fig. 4 shows the front view of flexible tray in the present invention;
Embodiment
Implementation of the present invention is described in detail below in conjunction with embodiment.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, hereafter will to make the present invention in conjunction with diagram and further illustrating.
Fig. 1 shows the total arrangement of flexible Three-line pendulum test stand, comprises experiment table support 210; Center suspension point 214 and the wire rope 224 hung; Three hitch points 211,212,213 and the equal wire rope 221,222,223 of three length hung.Experiment table support 210 comprises the upper plane of a level, upper plane three hitch points 211,212,213 one-tenth equilateral triangles arrange, and center suspension point 214 is positioned in the geometric center of equilateral triangle.Pulling force sensor 225,226,227 installed respectively by three wire rope 221,222,223; Three wire rope 221,222,223 hang round tray 230 below; The center of pallet and three concentric circless machined a series of relative to the centrosymmetric via hole 231 of round tray central point; The screw rod 232,234,236 that three are installed damper weight is set equably in the outer end of pallet; Each screw rod installs a damper weight 233,235,237, and damper weight can move along the radial direction of screw rod, as shown in Figure 2.
As shown in Figure 3, pallet 230 is selected several positions, relative to round tray central point centrosymmetric via hole 231, guide pipe 242 is installed, guide pipe passes from via hole 231, and be fixed on pallet 230 by upper and lower two fastening bolts 243, the height of guide pipe is determined according to specific needs, as shown in Figure 4.Studdle 241 is installed in guide pipe, and by rotating the height of adjustment studdle.The position of symmetry must use identical guide pipe, studdle and clamp nut, make the mass distribution of pallet symmetrical.
Before installation guide pole and studdle, adopt a tray supporting devices to be propped up by pallet, pallet is fixed, is convenient to mounting parts.After part on pallet installs, remove tray supporting devices, pallet 230 is hung on three wire rope, freely dangle to stable, read the numerical value of three pulling force sensors 225,226,227, make the number of degrees of three pulling force sensors consistent by the position adjusting 3 damper weights 233,235,237.Such pallet barycenter is overlapping with geometric center, and is positioned at immediately below center suspension point.
Tray supporting devices is again adopted to hold up, because in picking-up process, tray position can change, thus need again to adjust pallet by overlapping with geometric center for its barycenter, and be positioned at immediately below center suspension point, now take following steps adjustment: adopt tray supporting devices to hold up, adjustment pallet makes it be in horizontality, then on the wire rope 224 of center suspension point 214, a weight is hung, mobile pallet bracing or strutting arrangement and pallet, make the geometric center of pallet be positioned at immediately below weight, namely complete tray center and align process.Now the barycenter of pallet is overlapping with geometric center, and aligns with the mid point of weight, on the extended line being centrally located at wire rope 224 of such pallet.Because pallet is fixed by tray supporting devices, position can not change, and thus its barycenter overlaps with center suspension point always, and also change in location can not occur when follow-up adjustment studdle.
Take off the weight on wire rope 224.Then with wire rope, testee is bundled, and hang on wire rope 224, make it naturally dangle to static.Such testee is suspended in the top of pallet, and its barycenter also aligns with tray center.
Now by the height of adjustment studdle, make multiple studdle common support testee.Disconnect wire rope 224 and testee, then remove the pallet fixer below pallet 230, now measured object has just been placed on pallet exactly.
Just Torsion Pendulum can be carried out below.Pallet 230 is rotated a low-angle around central shaft, makes it freely rock, rocking the cycle by measuring, moment of inertia value can be calculated.
Carry out moment of inertia test based on experiment table of the present invention, the attitude of testee can be converted easily, record the moment of inertia of different axis, barycenter centering process can be completed fast simultaneously, accelerate conventional efficient.
The foregoing is only present pre-ferred embodiments, but can various changes and modifications be carried out when not deviating from scope of the present invention.Scope of the present invention indicates in the dependent claims, and all changes within equivalents meaning and scope all should be included in wherein.
Being simply described as follows of symbol in figure:
11,210: experiment table support;
211,212,213: hitch point;
214: center suspension point;
12,221,222,223,224: wire rope;
225,226,227: pulling force sensor;
230: pallet;
231: the via hole on pallet;
232,234,236: damper weight screw rod;
233,235,237: damper weight;
241: studdle;
242: guide pipe;
243: clamp nut.
Claims (8)
1. one kind adopts Three-line pendulum test stand to carry out the method for barycenter centering to object, described Three-line pendulum test stand comprises support and pallet, described support comprises the upper plane of a level, plane is distributed with three hitch points becoming equilateral triangles to arrange on described, each described hitch point hangs the equal rope of a length respectively, the below of described rope connects described pallet, and each described rope is provided with device for monitoring tension; The geometric center of described equilateral triangle arranges center suspension point, and described center suspension point is also hung with rope; Described pallet offers multiple via hole equably, described via hole can arrange guide pipe, in guide pipe, be provided with adjustable for height studdle; Described pallet is circular, and arranges three adjusting screw(rod)s equably in its outer rim, and described adjusting screw(rod) is provided with damper weight, and described damper weight can moving radially along described adjusting screw(rod);
Method comprises the following steps:
A. on described round tray, chosen position installs described guide pipe and studdle relative to the centrosymmetric via hole of round tray central point, regulates described round tray to make pallet center of gravity overlapping with geometric center and is positioned at immediately below described center suspension point;
B. use tray supporting devices from below tray support to be got up, and the position again adjusting pallet make pallet center of gravity overlapping with geometric center and is positioned at immediately below described center suspension point;
C. measured object rope is bundled, hang on below center suspension point, and free suspension makes it hover, now the center of gravity of testee is just in time positioned at directly over described pallet;
D. rotate described studdle, make measured object described in multiple described studdle common support;
E. disconnect the rope of described center suspension point, and remove the tray supporting devices below pallet.
2. method according to claim 1, it is characterized in that: wherein, before the process of described guide pipe and studdle is installed in step a, also comprises and use tray supporting devices from below tray support, wire rope is not stressed, the step that pallet does not rock.
3. the method according to any one of claim 1-2 claim, it is characterized in that: the position again adjusting pallet in step b makes pallet center of gravity overlapping with geometric center and the process be positioned at immediately below described center suspension point is: use tray supporting devices from below tray support, and adjust pallet and make its level, described center suspension point hangs a weight, it is made freely to hover, move horizontally tray supporting devices and pallet, the geometric center of pallet is positioned at immediately below weight.
4. method according to claim 1, is characterized in that, the form that described via hole is concentrically justified is evenly distributed on described pallet.
5. method according to claim 4, is characterized in that, on pallet, same each described mistake hole size is circumferentially identical, and the size of same each described guide pipe circumferentially, quality and size are also identical.
6. the method according to any one of claim 4-5, is characterized in that, the via hole relative to described round tray center position symmetry arranges described guide pipe and described studdle.
7. method according to claim 1, it is characterized in that, described guide pipe is cylindrical shape, and be inside and outsidely all processed with screw thread, described guide pipe is fixed on described pallet by external thread and nut, described studdle can be loaded in guide pipe by screw thread, and regulates bearing height by rotating.
8. method according to claim 6, it is characterized in that, described guide pipe is cylindrical shape, and be inside and outsidely all processed with screw thread, described guide pipe is fixed on described pallet by external thread and nut, described studdle can be loaded in guide pipe by screw thread, and regulates bearing height by rotating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153148.4A CN103267609B (en) | 2013-04-28 | 2013-04-28 | Three-line pendulum test stand is adopted object to be carried out to the method for barycenter centering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310153148.4A CN103267609B (en) | 2013-04-28 | 2013-04-28 | Three-line pendulum test stand is adopted object to be carried out to the method for barycenter centering |
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| CN103267609A CN103267609A (en) | 2013-08-28 |
| CN103267609B true CN103267609B (en) | 2015-11-25 |
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Families Citing this family (7)
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| CN106371467A (en) * | 2016-10-31 | 2017-02-01 | 榆林学院 | Multi-angle oscillating test platform with characteristic vertical lifting |
| CN106373463A (en) * | 2016-11-01 | 2017-02-01 | 江南大学 | Experiment instrument for three-line pendulum |
| CN106644269A (en) * | 2017-03-01 | 2017-05-10 | 江南大学 | Three-line pendulum upper disc |
| CN108007765B (en) * | 2017-12-31 | 2023-09-08 | 江苏科泰检测技术服务有限公司 | Horizontal adjustment fixing device for metal hardness detection |
| CN110411660B (en) * | 2019-08-27 | 2024-09-20 | 潍坊学院 | Three-line pendulum capable of verifying rigid body moment of inertia vertical axis theorem |
| CN111811733B (en) * | 2020-07-01 | 2022-06-28 | 上海航天精密机械研究所 | Universal device for measuring axial moment of inertia of eccentric revolving body |
| CN113375602B (en) * | 2021-04-25 | 2022-08-12 | 上海航天控制技术研究所 | Calibration compensation method of engine swing angle measuring system based on grating sensor |
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| US5038604A (en) * | 1987-08-05 | 1991-08-13 | Aerospatiale Societe Nationale Industrielle | Apparatus for measuring the mass-related characteristics of a body and its application to the measurement of the characteristics of a dry satellite |
| US5895849A (en) * | 1996-07-19 | 1999-04-20 | G.S. S.R.L. | Balancing method for motor vehicle wheels |
| CN201037808Y (en) * | 2007-04-18 | 2008-03-19 | 比亚迪股份有限公司 | Engine test bench |
| CN101187540A (en) * | 2007-12-17 | 2008-05-28 | 四川大学 | Suspending point equal radius three string pendulum |
| CN202002773U (en) * | 2011-03-24 | 2011-10-05 | 十堰东森汽车密封件有限公司 | Inertial parameter measuring integrated test table for motive power assembly |
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2013
- 2013-04-28 CN CN201310153148.4A patent/CN103267609B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5038604A (en) * | 1987-08-05 | 1991-08-13 | Aerospatiale Societe Nationale Industrielle | Apparatus for measuring the mass-related characteristics of a body and its application to the measurement of the characteristics of a dry satellite |
| US5895849A (en) * | 1996-07-19 | 1999-04-20 | G.S. S.R.L. | Balancing method for motor vehicle wheels |
| CN201037808Y (en) * | 2007-04-18 | 2008-03-19 | 比亚迪股份有限公司 | Engine test bench |
| CN101187540A (en) * | 2007-12-17 | 2008-05-28 | 四川大学 | Suspending point equal radius three string pendulum |
| CN202002773U (en) * | 2011-03-24 | 2011-10-05 | 十堰东森汽车密封件有限公司 | Inertial parameter measuring integrated test table for motive power assembly |
Non-Patent Citations (1)
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