CN106872103A - Processional moment measuring device and assay method - Google Patents
Processional moment measuring device and assay method Download PDFInfo
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- CN106872103A CN106872103A CN201710178026.9A CN201710178026A CN106872103A CN 106872103 A CN106872103 A CN 106872103A CN 201710178026 A CN201710178026 A CN 201710178026A CN 106872103 A CN106872103 A CN 106872103A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/10—Determining the moment of inertia
Abstract
The invention discloses a kind of processional moment measuring device and assay method, processional moment measuring device includes testing stand, reel, rotating shaft, base, pulley assembly, bracing wire and initially reinforces component；Testing stand and reel are connected to base by axis of rotation and testing stand, reel and rotating shaft three are coaxially fixed together, one end of bracing wire is connected to reel, the other end bypasses pulley assembly and freely hangs, and initial reinforcing component is installed on base for for the rotation of testing stand provides initial angular velocity；When underdrive angular acceleration is measured rotation system pulling force torque is given by counterweight, and providing certain initial angular velocity to testing stand and measured object by initial reinforcing component makes it complete underdrive under the Action of Gravity Field of frictional resistance and counterweight, ensure the uniformity of the initial angular velocity of testing stand and measured object during measurement every time, influence of the frictional resistance moment with angular speed change to experimental result, improves the accuracy of measurement result when reducing experiment.
Description
Technical field
The present invention relates to a kind of processional moment measuring device and assay method.
Background technology
Rotary inertia is the physical quantity that Rigid Body in Rotation With inertia size is measured, the measuring method master that current science and engineering colleges and universities use
There are three-line pendulum method, Inertia Based on Torsion Pendulum Method and Constructional Elements Using Falling Methods, from the experimental results, Constructional Elements Using Falling Methods measurement result is unstable and error is larger, in order to
Constructional Elements Using Falling Methods are solved the problems, such as, existing many people are studied.There is researcher to point out, in measurement, small quality to be selected as far as possible
Counterweight and minor radius cone pulley, can reduce the influence of the moment of resistance, also have researcher to analyze the stability of experiment the data obtained, it is indicated that
Can be screened suitable data and calculated by the way that experiment of slowing down is repeated during experiment, and as far as possible using smaller quality
Counterweight produces constant moment of force, but is repeated that deceleration experiment the data obtained is more, and workload greatly, is not suitable for reality during calculating
Teaching, and human factor is too big.Also there is the shadow that research experiment medium pulling rope deviates solid moment of inertia measured value with rotating shaft angle
Ring, and measured the relation of angular acceleration of the swing system under moment of resistance effect and rotating speed.Also researcher's analysis bracing wire is straight
The error of the influence and generation of footpath and laboratory apparatus adjustment details and other factorses to constant moment of force suffered by rigid body.Also study to resistance
Torque is estimated, and the moment of resistance is modified, the quantitative analysis influence of the moment of resistance and point out can with regulation experiment instrument
The influence of the method offset resistance square of working condition etc..Also there is research by improving Data Processing in Experiment process, improve the time
Measuring method, improves the accuracy of data, but, existing document result of study does not propose to be preferably adapted to the reality of teaching
Operating method, it is to avoid or reduce influence of the frictional resistance moment with angular speed change to experimental result.
The content of the invention
It is therefore an object of the present invention to a kind of processional moment measuring device is provided, in order to reduce frictional resistance moment during experiment
Influence with angular speed change to experimental result, rotation system pulling force is given when underdrive angular acceleration is measured also by counterweight
Torque, providing certain initial angular velocity to testing stand and measured object by initial reinforcing component makes it in frictional resistance and counterweight
Action of Gravity Field under complete underdrive, it is ensured that every time measurement when testing stand and measured object initial angular velocity uniformity, carry
The accuracy of high measurement result.
Processional moment measuring device of the invention, including testing stand, reel, rotating shaft, base, pulley assembly, bracing wire and
Initial reinforcing component；The testing stand and reel are connected to base by axis of rotation, and testing stand, reel and turn
Axle three be coaxially fixed together, and the pulley assembly is installed on base, and one end of the bracing wire is connected to reel, bracing wire
The other end bypasses pulley assembly and freely hangs, and the initial reinforcing component is installed on base for for the rotation of testing stand is provided
Initial angular velocity；Measured object is placed on testing stand during measurement, counterweight is loaded onto in the one end for then being hung in bracing wire, make testing stand and
Measured object is rotated under the promotion of initial reinforcing component, and deceleration turn is done under the Action of Gravity Field of frictional resistance and counterweight
It is dynamic, the angular acceleration of underdrive is measured, due to using initial reinforcing component for the rotation of testing stand provides initial angular velocity, because
The uniformity of the initial angular velocity of testing stand and measured object, improves the accuracy of measurement result when this ensure that measurement every time.
Further, the initial reinforcing component includes elastic force apparatus, and the footpath that the elastic force apparatus are arranged in testing stand is outside
Side is used to provide tangential elastic thrust for testing stand, because the direction of elastic thrust is the tangential of testing stand, therefore can be fully
The kinetic energy produced using elastic force apparatus, realizes the maximization of initial angular velocity.At the same time, the thrust for acting on testing stand is bullet
Power, enables testing stand smoothly to accelerate and rotate, it is to avoid testing stand is damaged caused by percussion.
Further, the edge of the testing stand is provided with stress block；The elastic force apparatus include chute, sliding block and stretching bullet
Spring；The chute along testing stand arranged tangential, the sliding block is slidably connected to chute, the extension spring be connected to chute and
Between sliding block, sliding block is provided with the pushing block for promoting stress block；Manually promote pushing block and sliding block whole slide and
Pushing block is set to be adjacent to the rear side of block, now extension spring is in the state being stretched, and then discharges pushing block, sliding block and pushing block is existed
Resetted under the pulling force effect of extension spring, while rotated by block motoring ring test platform, because pushing block moves along a straight line, and block
Movement in a curve is done, therefore pushing block and block are automatically separated in motion process, and pushing block automatically disengages the swing-around trajectory of block,
The motion of block is not hindered, in testing stand edge multiple blocks evenly distributed in the circumferential direction, not only facilitates operation, while can keep away
Exempt from testing stand centre-of gravity shift.
Further, the initial reinforcing component also includes mounting post, and the elastic force apparatus are fixed on base by mounting post,
Good integrity, and ensure geo-stationary between the chute and base of elastic force apparatus, it is ensured that the one of testing stand initial rotation state
Cause property.
Further, the reel is the cone pulley structure with the mutually different multiple winding slots of diameter, according to measurement
It is actually needed and the corresponding winding slot of reasonable Sexual behavior mode.
Further, the winding slot is 5 to 8, and the diameter of winding slot is gradually reduced from top to bottom.
Further, the processional moment measuring device also includes the detection components for Detecting data angular acceleration；Institute
Stating detection components includes support, shading rod and the optoelectronic switch being connected with digital millisecond counter；The shading rod is fixed vertically
In testing stand bottom surface；The optoelectronic switch is fixed on base by support；The optoelectronic switch and shading rod are respectively equipped with two,
, in 180 ° of angle distributions, the support takes the shape of the letter U for two optoelectronic switches and two shading rods, when shading rod is rotated with testing stand,
Pass in succession through the optoelectronic switch being connected with digital millisecond counter, can measure testing stand rotate to an angle needed for time and
Time difference during underdrive, and then calculate the angular acceleration of testing stand.
Further, the pulley assembly includes pulley bracket and is installed on the fixed pulley of pulley bracket, the pulley bracket
Base is installed in liftable mode；The coil holder for being oriented to bracing wire is further fixed on pulley bracket, is set on base
There is the boss for installing pulley bracket, pulley bracket is inserted vertically into boss by column, the boss is provided with for locking
The lock-screw of tight column, therefore twisting lock-screw energy column carries out the positioning of different height, realizes the liter of pulley bracket
Drop, to adapt to the height of different winding slots, is wound on fixed pulley after being drawstring through the pilot hole on coil holder, and setting coil holder can keep away
Exempt from bracing wire and depart from fixed pulley because of shake, it is ensured that measurement process stabilization is carried out.
The invention also discloses a kind of measuring moment of inertia method, measured using the used amount determining device of such rotation,
Counterweight is loaded onto at the end that hangs of bracing wire, allows processional moment measuring device to do uniformly retarded motion adjustment in fact after first doing uniformly accelerated motion
The size of check system initial angular velocity, record counterweight is risen to closest to the even test accelerated at falling motion starting position of counterweight
As a result；The measuring moment of inertia method, although frictional resistance moment is varied widely in the measurements, on result influence compared with
Small, measured rotary inertia result is relatively stable and accuracy is preferable, and frictional resistance moment change causes result when solving experiment
Data instability problem.
Further, actionradius r is respectively 15,20,25,30,35 millimeters of reel, the filled weight in end that hangs of bracing wire
Code quality is about 50 grams, can carry out multigroup experiment and be contrasted, and chooses optimal implementation.
The beneficial effects of the invention are as follows：Processional moment measuring device of the invention and assay method, can slow down in measurement and turn
Rotation system pulling force torque is given also by counterweight during dynamic angular acceleration, and is carried to testing stand and measured object by initial reinforcing component
It is set to complete underdrive under the Action of Gravity Field of frictional resistance and counterweight for certain initial angular velocity, it is ensured that when measuring every time
The uniformity of the initial angular velocity of testing stand and measured object, frictional resistance moment changes to experimental result with angular speed when reducing experiment
Influence, improve measurement result accuracy.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described.In accompanying drawing, each element or part are not
It is certain to be drawn according to actual ratio.
Fig. 1 is structural representation of the invention；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is that testing stand is even to be accelerated to rotate curve map；
Fig. 4 (a)-(e) is the even underdrive curve of testing stand；
Fig. 5 is that testing stand and the even acceleration of disk rotate curve；
Fig. 6 (a)-(e) is testing stand and the even underdrive curve of disk.
Specific embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Technical scheme is clearly illustrated, therefore is only used as example, and protection model of the invention can not be limited with this
Enclose.
Embodiment one：
As depicted in figs. 1 and 2：The processional moment measuring device of the present embodiment, including testing stand 8, reel 7, rotating shaft 6,
Base 12, pulley assembly, bracing wire 18 and initially reinforce component；The testing stand 8 and reel 7 rotate connection by rotating shaft 6
Coaxially it is fixed together in base 12 and testing stand 8, reel 7 and the three of rotating shaft 6, the pulley assembly is installed on base
12, one end of the bracing wire 18 is connected to reel 7, and the other end of bracing wire 18 bypasses pulley assembly and freely hangs, described first
Beginning reinforcing component is installed on base 12 for for the rotation of testing stand 8 provides initial angular velocity；Measured object is placed on examination during measurement
Test on platform 8, counterweight 20 is loaded onto in the one end for then being hung in bracing wire 18, make testing stand 8 and measured object pushing away in initial reinforcing component
Rotated under dynamic, and underdrive is done under the Action of Gravity Field of frictional resistance and counterweight 20, the angle for measuring underdrive accelerates
Degree, due to using initial reinforcing component for the rotation of testing stand 8 provides initial angular velocity, tries during therefore, it is possible to ensureing to measure every time
The uniformity of the initial angular velocity of platform 8 and measured object is tested, the accuracy of measurement result is improved；The initial reinforcing component includes bullet
Power apparatus and mounting post 17, the radial outside that the elastic force apparatus are arranged in testing stand 8 are used for as testing stand 8 provides tangential bullet
Property thrust, because the direction of elastic thrust is tangential for testing stand 8, therefore the kinetic energy that elastic force apparatus produce can be made full use of, it is real
The maximization of existing initial angular velocity, at the same time, acts on the thrust of testing stand 8 for elastic force, testing stand 8 is smoothly added
Speed is simultaneously rotated, it is to avoid testing stand 8 is damaged caused by percussion；The elastic force apparatus are fixed on base by mounting post 17
12, good integrity, and ensure geo-stationary between the chute 1 and base 12 of elastic force apparatus, it is ensured that the initial rotation shape of testing stand 8
The uniformity of state；The edge of the testing stand 8 is provided with stress block 4；The elastic force apparatus include chute 1, sliding block 3 and stretching bullet
Spring 2；The chute 1 along testing stand 8 arranged tangential, the sliding block 3 is slidably connected to chute 1, and the extension spring 2 is connected to
Between chute 1 and sliding block 3, sliding block 3 is provided with the pushing block 5 for promoting stress block 4；Manually promote pushing block 5 and sliding block 3
Whole slide and pushing block 5 is set to be adjacent to the rear side of block 4, now extension spring 2 is in the state being stretched, and then discharges pushing block
5, sliding block 3 and pushing block 5 is resetted under the pulling force effect of extension spring 2, while rotated by the motoring ring test platform 8 of block 4, due to
Pushing block 5 moves along a straight line, and block 4 does movement in a curve, therefore pushing block 5 and block 4 are automatically separated in motion process, and pushes away
Block 5 automatically disengages the swing-around trajectory of block 4, and the motion of block 4 is not hindered, evenly distributed in the circumferential direction in the edge of testing stand 8
Multiple blocks 4, not only facilitate operation, while being avoided that the centre-of gravity shift of testing stand 8.
Fixed-axis rotation law according to rigid body：As long as determining sum total moment of face M and torque work suffered during Rigid Body in Rotation With
With the angular acceleration β of lower Rigid Body in Rotation With, then the rotary inertia J of the rigid body can be calculated, the constant moment of force for generally using at present is rotated
Method measuring principle is as follows：
If the rotary inertia of empty testing stand 8 with the rotation of certain initial angular velocity is as J1, when not adding counterweight 20, frictional resistance moment
Size is Mμ1, testing stand 8 is with angular acceleration β1Make uniformly retarded motion, i.e.,：
Mμ1=J1β1 (1)
By quality for the counterweight 20 of m is wound on the cone pulley of testing stand 8 that radius is r with bracing wire 18, and allow counterweight 20 to fall, be
System will make uniformly accelerated motion and consider frictional resistance moment M under the effect of permanent external forceμ2=Mμ1In the presence of, if the acceleration of counterweight 20
It is a1, the angular acceleration of testing stand 8 is β2, now have：
mg-FT1=ma1=mr β2 (2)
rFT1-Mμ1=J1β2 (3)
Then have：
m(g-rβ2)r-Mμ1=J1β2 (4)
(1), (4) two formula simultaneous are eliminated into Mμ1Afterwards, can obtain：
Similarly, if the rotary inertia of system is J after adding testee on testing stand 82, plus angle before and after counterweight 20 adds
Speed is respectively β3With β4, then have：
In Lab of General Physics, the mass m of counterweight 20 commonly uses several grams to tens grams, and the cone pulley radius r of testing stand 8 is tens millis
Rice, the rotary inertia of testee is 10-3kg·m2The order of magnitude, therefore a1=r β2＜ ＜ g, r β4＜ ＜ g, thus formula (5) and
(6) can be reduced to
From the principle of stacking of rotary inertia, the rotary inertia J of testee3For：
J3=J2-J1 (7)
That taken absolute value when the various middle moment of resistance and angular acceleration calculating measures r, m and β1、β2、β3、β4, by (5 '), (6 '),
(7) formula can calculate the rotary inertia of testee.
Frictional resistance moment changes with angular speed during the display experiment of existing document result, and excursion is larger, if formula (1) and
Frictional resistance moment differs greatly in experiment in formula (4), and thinks equal when calculating, and so certainly will bring larger mistake to result
Difference, so the rotary inertia error size of testee is determined by frictional resistance moment, thus, many documents are all mentioned and selected as far as possible
Small mass weight 20 and minor radius cone pulley, obtain angular acceleration change less, and frictional resistance moment change is little, but, do so
Still root problem can not be solved.
In order to reduce influence of the frictional resistance moment with angular speed change to experimental result during experiment, turning for the present embodiment is used
Dynamic used amount determining device, rotation system pulling force torque is given when underdrive angular acceleration is measured also by counterweight 20, and reduction rubs
Wipe the ratio of moment of resistance resultant moment suffered by rotation system in measurement.
If the mass of counterweight 20 is m, actionradius are the cone pulley of r during experiment, ignore pulley moment of friction and quality.Sky experiment
The rotary inertia of platform 8 is J4。
By quality for the counterweight 20 of m is wound on the cone pulley of testing stand 8 that radius is r with bracing wire 18, and allow counterweight 20 to fall, be
System makees uniformly accelerated motion under the effect of permanent external force, when testing stand 8 accelerates to rotate, by moment of resistance Mμ3With drag torque rFT2Effect,
Angular acceleration size is β5The acceleration magnitude that counterweight 20 declines is a2According to Newton's second law and law of rotation, have
mg-FT2=ma2=mr β5 (8)
rFT2-Mμ3=J4β5 (9)
Then have
mr(g-rβ5)-Mμ3=J4β5 (10)
When measuring system makees underdrive, by quality for the counterweight 20 of m is wound on the testing stand 8 that radius is r with bracing wire 18
On cone pulley, give testing stand 8 certain initial angular velocity by initial reinforcing component, allow cone pulley to be driven on counterweight 20 by bracing wire 18
Rise, system will make uniformly retarded motion under the effect of permanent external force, then have
FT3- mg=ma3=mr β6 (11)
rFT3+Mμ4=J4β6 (12)
Can obtain
mr(g+rβ6)+Mμ4=J5β6 (13)
Although moment of resistance size with angular speed change, experiment when, if the even underdrive of the system of testing stand 8 and it is even plus
Fast rotation process angular speed excursion is little and roughly the same, the moment of resistance size M being subject in motion processμ3≈Mμ4, then have
FT2=mg-mr β5 (15)
FT3=mg+mr β6 (16)
Mμ3=mr (g-r β5)-J4β5 (17)
Mμ4=J4β6-mr(g+rβ6) (18)
Similarly, if the rotary inertia of system is J after adding testee on testing stand 85, plus identical counterweight 20 is wound on phase
With the angular acceleration size respectively β on the cone pulley of testing stand 8 of radius, making even acceleration and uniformly retarded motion7With β8, can obtain
FT4=mg-mr β7 (20)
FT5=mg+mr β8 (21)
Mμ5=mr (g-r β7)-J5β7 (22)
Mμ6=J5β8-mr(g+rβ8) (23)
In formula, the moment of resistance and angular acceleration take absolute value when calculating, and according to rotary inertia principle of stacking, testee turns
Dynamic inertia is
J6=J5-J4 (24)
In above formula (14)-(23), it is contemplated that experiment condition has the acceleration a=r β ＜ ＜ g of counterweight 20, can be various
Simplify.
In the present embodiment, the reel 7 is the cone pulley structure with the mutually different multiple winding slots of diameter, according to survey
That measures is actually needed and the corresponding winding slot of reasonable Sexual behavior mode；The winding slot is 5 to 8, and the diameter of winding slot is from top to bottom
It is gradually reduced, the processional moment measuring device also includes the detection components for the angular acceleration of Detecting data 8；The detection
Component includes support 11, shading rod 9 and the optoelectronic switch 10 being connected with digital millisecond counter；The shading rod 9 is fixed vertically
In the bottom surface of testing stand 8；The optoelectronic switch 10 is fixed on base 12 by support 11；9 points of the optoelectronic switch 10 and shading rod
Two are not provided with, and, in 180 ° of angle distributions, the support 11 takes the shape of the letter U, shading rod for two optoelectronic switches 10 and two shading rods 9
9 with testing stand 8 when rotating, and passes in succession through the optoelectronic switch 10 being connected with digital millisecond counter, can measure testing stand 8 and rotate necessarily
Time needed for angle and the time difference during underdrive, and then calculate the angular acceleration of testing stand 8, the cunning
Wheel assembly includes pulley bracket 16 and is installed on the fixed pulley 15 of pulley bracket 16, and the pulley bracket 16 is in liftable mode
It is installed on base 12；The coil holder 19 for being oriented to bracing wire 18 is further fixed on pulley bracket 16, base 12 is provided with use
In the boss 13 for installing pulley bracket 16, pulley bracket 16 is inserted vertically into boss 13 by column, and the boss 13 is provided with
Lock-screw 14 for locking column, therefore the energy column of twisting lock-screw 14 carries out the positioning of different height, realizes sliding
The lifting of wheel support 16, to adapt to the height of different winding slots, bracing wire 18 determines cunning through being wound on after the pilot hole on coil holder 19
On wheel 15, coil holder 19 is set and is avoided that bracing wire 18 departs from fixed pulley 15 because of shake, it is ensured that measurement process stabilization is carried out.
Embodiment two：
As shown in Fig. 1-6, the measuring moment of inertia method of the present embodiment is carried out using the used amount determining device of such rotation
Measurement, counterweight 20 is loaded onto at the end that hangs of bracing wire 18, allows processional moment measuring device to do even fortune of slowing down after first doing uniformly accelerated motion
The size of dynamic regulation experiment system initial angular velocities, record counterweight 20 rises to closest to counterweight 20 is even and accelerates falling motion to open
Test result at beginning position；Actionradius r is respectively 15,20,25,30,35 millimeters of reel 7, the end that hangs of bracing wire 18
The mass of counterweight 20 for being filled is 50 grams, can carry out multigroup experiment and be contrasted, and chooses optimal implementation；The measuring moment of inertia
Method, although frictional resistance moment is varied widely in the measurements, smaller, measured rotary inertia result is influenceed on result
Preferably, frictional resistance moment change causes result data instability problem to relatively stable and accuracy when solving experiment, actual
In measurement, to empty testing stand 8 and the separately measurement of measured object testing stand 8 need to be placed with, be 491.64 grams with quality, a diameter of 240 milli
The disk of rice is as follows as the result of the test that measured object is carried out：
Solid line is using multinomial θ=At+Bt in Fig. 3-62Matched curve is according to uniform variable motion equation：Then ω0=A, β=2 π B. results show that every group of data fitting effect is good, the data obtained such as table 1,
Shown in table 2, table 3.
Table 1：Frictional resistance moment and drag torque compare when experimental bench system is rotated：
Table 2：Experimental bench uniform variable motion test result：
Table 3：Experimental bench and disk uniform variable motion test result：
Be can be seen that from Fig. 3 to Fig. 6 using the measuring moment of inertia method measurement the data obtained matched curve of the present embodiment
Although the fine of effect controls angular speed size variation scope in experiment, measure hour angle using same radius cone pulley
Speed variation can not possibly be completely the same, poor additionally, due to even acceleration and uniformly retarded motion process frictional resistance moment size
Not, cause to be had any different using the cone pulley measurement result relative error of different radii.
As shown in Table 1, when being measured using the cone pulley of different radii, drag torque increase makes frictional resistance moment increase with cone pulley radius
Increase greatly, and frictional resistance moment is varied widely.But, the ratio between frictional resistance moment and drag torque are tapered into.In addition,
It is even acceleration and uniformly retarded motion during fine rule pulling force closely simultaneously, knowable to table 2 and the data of table 3, the acceleration of counterweight 20
Can be ignored much smaller than acceleration of gravity, during calculating additionally, experimental bench rotation inerttia result minimum value and maximum difference
About 3.2%, experimental bench and disk rotational inertia measurement result minimum value and maximum difference are about 2.1%, and disk rotational is used to
Measurements minimum value and maximum difference are about 2.5%, and the Experiment of Moment of Inertia value and theoretical value that measure disk are relative
The smaller tables 1 and 3 of error understand, with respect to the result that cone pulley radius is 25 millimeters, cone pulley radius more hour, the mistake of acquired results
Difference is relatively slightly larger, and reason is the large percentage that frictional resistance moment accounts for drag torque；And cone pulley radius it is bigger when, due to angular speed become
Change scope bigger, therefore frictional resistance moment change causes result relative error slightly larger.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme, it all should cover in the middle of the scope of claim of the invention and specification.
Claims (10)
1. a kind of processional moment measuring device, it is characterised in that：Including testing stand, reel, rotating shaft, base, pulley assembly, drawing
Line and initial reinforcing component；The testing stand and reel are connected to base, and testing stand, reel by axis of rotation
Three is coaxially fixed together with rotating shaft, and the pulley assembly is installed on base, and one end of the bracing wire is connected to reel, draws
The other end of line bypasses pulley assembly and freely hangs, it is described it is initial reinforcing component be installed on base for for testing stand rotation
Initial angular velocity is provided.
2. processional moment measuring device according to claim 1, it is characterised in that：The initial reinforcing component includes elastic force
Device, the radial outside that the elastic force apparatus are arranged in testing stand is used for as testing stand provides tangential elastic thrust.
3. processional moment measuring device according to claim 2, it is characterised in that：The edge of the testing stand is provided with stress
Block；The elastic force apparatus include chute, sliding block and extension spring；The chute along testing stand arranged tangential, the sliding block
Chute is slidably connected to, the extension spring is connected between chute and sliding block, and sliding block is provided with for promoting stress block
Pushing block.
4. processional moment measuring device according to claim 3, it is characterised in that：The initial reinforcing component also includes peace
Dress post, the elastic force apparatus are fixed on base by mounting post.
5. processional moment measuring device according to claim 1, it is characterised in that：The reel is mutual not with diameter
The cone pulley structure of identical multiple winding slot.
6. processional moment measuring device according to claim 5, it is characterised in that：The winding slot is 5 to 8, coiling
The diameter of groove is gradually reduced from top to bottom.
7. processional moment measuring device according to claim 1, it is characterised in that：The processional moment measuring device is also wrapped
Include the detection components for Detecting data angular acceleration；The detection components include support, shading rod and with digital millisecond
The optoelectronic switch that meter is connected；The shading rod is fixed on testing stand bottom surface vertically；The optoelectronic switch is fixed on by support
Base.
8. processional moment measuring device according to claim 1, it is characterised in that：The pulley assembly includes pulley bracket
With the fixed pulley for being installed on pulley bracket, the pulley bracket is installed on base in liftable mode；It is also solid on pulley bracket
Surely there is the coil holder for being oriented to bracing wire.
9. a kind of measuring moment of inertia method, it is characterised in that：Rotation described in usage right requirement 1-8 any claims is used to
Amount determining device is measured, and counterweight is loaded onto at the end that hangs of bracing wire, after allowing processional moment measuring device first to do uniformly accelerated motion
The size of uniformly retarded motion regulation experiment system initial angular velocities is done, record counterweight rises to closest to counterweight is even and accelerates to fall
Test result at motion starting position.
10. measuring moment of inertia method according to claim 9, it is characterised in that：Actionradius r is respectively 15,20,
25th, 30,35 millimeters of reel, the filled counterbalance mass in end that hangs of bracing wire is 50 grams.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613773A (en) * | 2018-04-09 | 2018-10-02 | 北京石油化工学院 | Method based on smart mobile phone gyro sensor Measuring Moment of Inertia Using |
| CN112129441A (en) * | 2020-08-20 | 2020-12-25 | 武汉纺织大学 | Device and method for measuring yarn torque through free rotor |
| CN113218576A (en) * | 2021-04-12 | 2021-08-06 | 中国石油化工股份有限公司 | Device and method for detecting rotational inertia of large-scale shaft part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Cited By (3)
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| CN108613773A (en) * | 2018-04-09 | 2018-10-02 | 北京石油化工学院 | Method based on smart mobile phone gyro sensor Measuring Moment of Inertia Using |
| CN112129441A (en) * | 2020-08-20 | 2020-12-25 | 武汉纺织大学 | Device and method for measuring yarn torque through free rotor |
| CN113218576A (en) * | 2021-04-12 | 2021-08-06 | 中国石油化工股份有限公司 | Device and method for detecting rotational inertia of large-scale shaft part |
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