CN108806422A - A kind of statics synthesis experiment platform and experimental method - Google Patents
A kind of statics synthesis experiment platform and experimental method Download PDFInfo
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- 239000000463 material Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims description 21
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Abstract
A kind of statics synthesis experiment platform and experimental method, the experiment porch includes the rack with sliding slot, plane frame structure and plane three-hinged arch structure mounted on rack rear and front end, mounted on the adjustable load column of rack medium position, horizon bar that is adjustable in load column upper position and can moving up and down is set, the pulley in horizontal boom end is set;Connection between plane frame structure and rack can be used both ends and fix hinged mode or in such a way that fixation hinged other end in one end is movably hinged, different and elasticity modulus material can be used from plane three-hinged arch structural member material in plane frame structure, plane frame structure and plane three-hinged arch structure use different loading positions during the experiment, to the influence of the transmissibility of specific force on different structure to restraining force and internal force, the adjustable loading device of position height and orientation is in addition to can easily load plane framework and three-hinged arch, can also complete independently friction coefficient determination experiment.
Description
Technical field
The present invention relates to experiment of machanics field, more particularly to a kind of statics synthesis experiment platform and experimental method.
Background technology
Existing Basic Mechanics Experiment platform is largely for the knowledge point in material mechanics course, rational mechanics class
The experiment porch of correlated knowledge point is limited in journey, and experimental project is outmoded.Lack Comprehensive Experimental Platform support student by theoretical power
It learns and combines with the knowledge point in material mechanics course, carry out comprehensive experiment, further recognize mechanical model and related original
The applicability of reason.
Invention content
In order to overcome the above problem, it is an object of the invention to propose a kind of statics synthesis experiment platform and experiment side
Method realizes that determinate plane, redundant structure restraining force, internal force measures and friction coefficient measurement.Experiment includes different springforms
Static determinacy that the rod piece of amount is constituted, indeterminate a variety of mechanical models, a point difference load, to the transmissibility of specific force for static determinacy, super
The application conditions and its affecting laws of intelligential transmissibility, load dress are goed deep into the influence of statically determinate structure restraining force and internal force
Friction coefficient measurement can independently be carried out by setting, and verify Euler's friction formula.The Comprehensive Experiment is for reinforcing the Students ' Comprehensive ability of practice
Culture, excitation student, which gos deep into intelligential transmissibility property, the indeterminate model difference of static determinacy, quiet sliding friction etc., has actively weight
The meaning wanted.
In order to achieve the above object, the technical proposal of the invention is realized in this way:
A kind of statics synthesis experiment platform, includes the rack 1 with sliding slot, and 1 rear and front end of rack is separately installed with plane
The middle part of three-hinged arch structure 2 and plane frame structure 3, rack 1 is equipped with the adjustable load column 4 in position, loads and is set on column 4
It is equipped with the horizon bar 5 that orientation is adjustable and can be moved up and down on load column 4,5 end set of horizon bar has pulley 6;It is described
There are two load(ing) points for plane three-hinged arch structure 2 and plane frame structure 3, and preferably two load(ing) points are in plane three-hinged arch structure
2 and plane frame structure 3 vertical bar on, and must be positioned in same horizontal line;Plane three-hinged arch structure 2 and plane framework knot
Structure 3 is additionally provided with the foil gauge of the measurement being connect with strain testing instrument rod piece strain when being loaded on two load(ing) points.
The plane frame structure 3 and rod piece of plane three-hinged arch structure 2 can be changed to cross sectional shape and size is identical
The different rod piece of elasticity modulus of materials.
The pulley 6 uses movable pulley in plane framework and three-hinged arch loading experiment, and quiet cunning is used in frictional experiment
Wheel.
The connection type of the plane frame structure 3 and rack 1 is fixed using both ends hingedly forms redundant structure, or
One end fixes the hinged other end and movably hingedly forms statically determinate structure, and two kinds of connection type lower structure shape and size are identical.
The plane three-hinged arch structure 2 is static determinacy three-hinged arch made of being hinged by hinge 11 by two right angle bars.
The experimental method of the statics synthesis experiment platform,
3 both ends of plane frame structure are connected to by fixed-hinged support on rack 1 and form redundant structure, adjustable pulley
6 orientation, plane and plane frame structure 3 are coplanar where making pulley radius, and flexible cable one end ties up to the load of plane frame structure 3
On point, the other end hangs counterweight across pulley 6, and two load(ing) point upper edges are horizontal in the vertical bar of plane frame structure 3 respectively
Direction loads, the strain of rod piece when measuring different loading positions by foil gauge, and the signal access of foil gauge is placed on experiment dress
The strain testing instrument for setting side, according to Wheatstone bridge output characteristics and internal force test principle wiring, test rod piece axle power and
Moment of flexure, test result reflect the influence that power generates restraining force and internal force along the translation of its position in redundant structure;It will
The fixed-hinged support of 3 one end of plane frame structure is replaced with movable hinged shoe, and plane frame structure 3 becomes statically determinate structure, respectively
In two load(ing) point horizontal addloads, measuring strain calculates restraining force and internal force;Measurement result reflects that power is made in statically determinate structure upper edge
The influence to restraining force and internal force is translated with line.
It for plane three-hinged arch structure 2, is mounted on rack 1 using fixed-hinged support, composition determinate plane structure, two
Right angle bar is hinged, changes the orientation of horizon bar 5 so that plane where pulley radius and 2 place of plane three-hinged arch structure
Co-planar hangs counterweight, in the vertical bar of plane three-hinged arch structure 2 on two load(ing) points successively using flexible cable across pulley
An equal amount of load is loaded in the horizontal direction, and strain when different loading positions, the signal of foil gauge are measured by foil gauge
Access is placed on the deformeter beside experimental provision, according to Wheatstone bridge output characteristics and internal force test principle wiring, test
The axle power and moment of flexure of rod piece, measurement result reflect power and slide the front and back influence to restraining force at hinge 11 along position and set
Set the influence of internal force at deformeter;The material for replacing two right angle bars, the restraining force and internal force carried out under same loading environment measure,
Compare restraining force and internal force of the static determinacy three-hinged arch of different materials under identical external applied load;
In plane framework and three-hinged arch loading experiment, pulley 6 uses movable pulley, and the counterweight weight of flexible cable suspension is water
Pulley is changed to quiet pulley by the size of flat load in addition to horizontal addload, across a flexible cable, the suspension of flexible cable one end on pulley
Counterweight, the other end are held with dynamometer spring, and the pulling force size that comparison counterweight weight is measured with dynamometer spring rubs according to Euler
Formula calculates the friction coefficient between flexible cable and quiet pulley.
Statics synthesis experiment platform of the present invention can carry out the determinate plane structure of different constraints and different materials and surpass
Statically determinate structure restraining force measures and internal force measurement experiment, and friction coefficient measurement reality can be opened up using quiet pulley on loading device
It tests.It when experiment, is tested completely according to experimental duties book autonomous Design by student, precedence constraints can be slid along position with measuring force
The variation of power and the variation of rod piece internal force, the front and back function and effect of observation sliding, can also replace constrained type, and comparison is same
Function and effect of the power of sample size in statically determinate structure and redundant structure replace the different quiet pulley of roughness, measure quiet cunning
The coefficient of kinetic friction verifies Euler's friction formula.The invention is with bar material is replaceable, constrained type is replaceable, loading position
The advantages that tightly playing, is easy to operate replaceable, simple in structure.The experimental project that can be opened up is for reinforcing the Students ' Comprehensive ability of practice
Culture, excitation student go deep into intelligential transmissibility inference, understand that influence, quiet sliding of the load for static determinacy redundant structure rub
Scrape along friction coefficient measurement method etc. has the meaning of positive important.
Description of the drawings
Fig. 1 is the front view of the present invention.
Fig. 2 is the front view of frame structure.
Fig. 3 is the front view of three-hinged arch.
Specific implementation mode
The structural principle to the present invention and operation principle make narration in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2 and Figure 3, a kind of statics synthesis experiment platform, includes the rack 1 with sliding slot, before rack 1
Face mounting plane three-hinged arch structure 2, behind mounting plane frame structure 3, installation load column 4 in the middle part of rack 1 loads column 4
It is installed above to have the horizon bar 5 that moved up and down on load column 4, the end of horizon bar 5 that pulley 6,5 side of horizon bar are installed
Adjustable, the orientation of adjustable pulley 6 in position, plane and plane frame structure 3 are coplanar where making pulley radius, and flexible cable one end ties up to plane
On the load(ing) point of frame structure 3, the other end hangs counterweight across pulley 6, and plane frame structure 3D points are pasted with plane framework and answer
Become piece 14, there are two the load(ing) points on plane frame structure 3, sliding load column 4, respectively in the vertical of plane frame structure 3
It is loaded successively on two load(ing) points 7 and 8 on bar, load(ing) point 7 and 8 in the same horizontal line, changes the orientation of horizon bar 5 so that
Plane where pulley radius and 2 place co-planar of plane three-hinged arch structure hang counterweight, in plane using flexible cable across pulley
Loaded successively on two load(ing) points 9 and 10 in the vertical bar of three-hinged arch structure 2, load(ing) point 9 and 10 in the same horizontal line, plane
The E points of 2 right side lever of three-hinged arch structure are pasted with plane three-hinged arch foil gauge 15, and movable pulley can be used in loading device middle pulley 6
With quiet pulley, movable pulley is used in three-hinged arch and plane framework loading experiment, with quiet pulley in friction coefficient measurement experiment.
Plane frame structure 3 can be used a fixed-hinged support with rack 1 and be connect with a movable hinged shoe, it is also possible to two
A fixed-hinged support connection, realizes static determinacy and indeterminate two kinds of structures, plane frame structure 3 and 2 material of plane three-hinged arch structure
Replaceable, using the material of dual extension-compression modulus, influence of the contrast material elasticity modulus to experimental result, pulley 6 can be used
The different quiet pulley of surface roughness measures the quiet coefficient of sliding friction between different materials by hanging counterweight.
The experimental method of statics synthesis experiment platform of the present invention is:
According to designed, designed and the scheme by confirming, 3 both ends of plane frame structure are connected to by fixed-hinged support
Redundant structure is formed on rack 1, the orientation of adjustable pulley 6, plane and plane frame structure 3 are coplanar where making pulley radius,
Flexible cable one end ties up on the load(ing) point of plane frame structure 3, and the other end hangs counterweight across pulley 6, respectively in two load(ing) points 7
With 8 on load in the horizontal direction, when measuring different loading positions by plane framework foil gauge 14 at D points rod piece strain, D points
The signal access of place's plane framework foil gauge 14 is placed on the strain testing instrument beside experimental provision, is exported according to Wheatstone bridge
Characteristic and internal force test principle wiring, test the axle power and moment of flexure of rod piece, and test result reflects power edge in redundant structure
The influence that the translation of its position generates restraining force and internal force;The fixed-hinged support of 3 one end of plane frame structure is replaced with can
Dynamic hinged-support, plane frame structure 3 become statically determinate structure, respectively in two load(ing) points 7 and the flat load of 8 two water, measure D points
Strain, calculates restraining force and internal force, and measurement result reflects that power is translated in statically determinate structure upper edge position to restraining force and internal force
It influences.
It for plane three-hinged arch structure 2, is mounted on rack 1 using fixed-hinged support, composition determinate plane structure, two
Right angle bar is hinged, changes the orientation of horizon bar 5 so that plane where pulley radius and 2 place of plane three-hinged arch structure
Co-planar hangs counterweight, two load(ing) points 9 and 10 in the vertical bar of plane three-hinged arch structure 2 using flexible cable across pulley
On load an equal amount of load successively in the horizontal, E when measuring different loading positions by plane three-hinged arch foil gauge 15
The signal access of the strain of point, E point plane three-hinged arch foil gauge 15 is placed on the deformeter beside experimental provision, according to favour stone
Bridge output characteristic and internal force test principle wiring, test the axle power and moment of flexure of rod piece, and measurement result reflects power along position
The influence of internal force at the front and back influence and E to restraining force at hinge 11 of sliding.The material of two right angle bars is replaced, equally add
Restraining force under the conditions of load and internal force measure, compare restraining force of the static determinacy three-hinged arch of different materials under identical external applied load with it is interior
Power.
The loading device that this experimental bench uses, in plane framework and three-hinged arch loading experiment, pulley 6 uses movable pulley,
The counterweight weight of flexible cable suspension is that pulley is changed to quiet pulley, in quiet pulley by the size of horizontal load in addition to horizontal addload
On across a flexible cable, flexible cable one end hangs counterweight, and counterweight weight is G, and the other end is held with dynamometer spring, slowly promotes counterweight,
Lifting process ensures that dynamometer spring reading is constant, and the pulling force size that dynamometer spring measures is F, and cornerite of the flexible cable on pulley is big
Small is β, and by counterweight weight G, the reading F of dynamometer spring, cornerite β of the flexible cable on pulley brings Euler's friction formula F=Ge intouβ,
The quiet coefficient of sliding friction u of flexible cable and quiet pulley is calculated.
Claims (6)
1. a kind of statics synthesis experiment platform, which is characterized in that include the rack (1) with sliding slot, rack (1) rear and front end point
Plane three-hinged arch structure (2) and plane frame structure (3) are not installed, the adjustable load in position is installed in the middle part of rack (1)
Column (4) loads the horizon bar (5) for being provided with that orientation is adjustable and can be moved up and down on load column (4) on column (4),
Horizon bar (5) end set has pulley (6);There are two loads for the plane three-hinged arch structure (2) and plane frame structure (3)
Point, when two load(ing) points are in plane three-hinged arch structure (2) and the vertical bar of plane frame structure (3), it is necessary to be located at same
On one horizontal line;Plane three-hinged arch structure (2) and plane frame structure (3) are additionally provided with the measurement being connect with strain testing instrument and exist
The foil gauge of rod piece strain when being loaded on two load(ing) points.
2. a kind of statics synthesis experiment platform according to claim 1, it is characterised in that:The plane frame structure
(3) cross sectional shape and the different bar of the identical elasticity modulus of materials of size can be changed to the rod piece of plane three-hinged arch structure (2)
Part.
3. a kind of statics synthesis experiment platform according to claim 1, it is characterised in that:The pulley (6) is in plane
Movable pulley is used in frame and three-hinged arch loading experiment, and quiet pulley is used in frictional experiment.
4. a kind of statics synthesis experiment platform according to claim 1, it is characterised in that:The plane frame structure
(3) redundant structure is hingedly formed using both ends fixation with the connection type of rack (1) or the hinged other end of one end fixation can
Dynamic hingedly to form statically determinate structure, two kinds of connection type lower structure shape and size are identical.
5. a kind of statics synthesis experiment platform according to claim 1, it is characterised in that:The plane three-hinged arch structure
(2) it is static determinacy three-hinged arch made of being hinged by hinge (11) by two right angle bars.
6. the experimental method of statics synthesis experiment platform described in any one of claim 1 to 5, it is characterised in that:
Plane frame structure (3) both ends are connected to by fixed-hinged support on rack (1) and form redundant structure, adjustable pulley
(6) orientation, plane and plane frame structure (3) are coplanar where making pulley radius, and flexible cable one end ties up to plane frame structure (3)
Load(ing) point on, the other end across pulley (6) hang counterweight, respectively in the vertical bar of plane frame structure (3) two load
It is loaded in the horizontal direction on point, the strain of rod piece when measuring different loading positions by foil gauge, the signal access of foil gauge is put
The strain testing instrument beside experimental provision is set, according to Wheatstone bridge output characteristics and internal force test principle wiring, reference test bar
The axle power and moment of flexure of part, test result reflect power and are generated to restraining force and internal force along the translation of its position in redundant structure
Influence;The fixed-hinged support of plane frame structure (3) one end is replaced with movable hinged shoe, plane frame structure (3) becomes
Statically determinate structure, respectively in two load(ing) point horizontal addloads, measuring strain calculates restraining force and internal force, and measurement result reflection power exists
Statically determinate structure upper edge position translates the influence to restraining force and internal force.
It for plane three-hinged arch structure (2), is mounted on rack (1) using fixed-hinged support, composition determinate plane structure, two
Right angle bar is hinged, changes the orientation of horizon bar (5) so that plane where pulley radius and plane three-hinged arch structure (2)
Place co-planar hangs counterweight, two load(ing) points in the vertical bar of plane three-hinged arch structure (2) using flexible cable across pulley
On load an equal amount of load successively in the horizontal, strain when different loading positions, foil gauge are measured by foil gauge
Signal access be placed on deformeter beside experimental provision, connect according to Wheatstone bridge output characteristics and internal force test principle
Line tests the axle power and moment of flexure of rod piece, and it is front and back to restraining force at hinge (11) along position sliding that measurement result reflects power
Influence and be arranged the influence of internal force at deformeter;The material for replacing two right angle bars, carries out the restraining force under same loading environment
And internal force measures, and compares restraining force and internal force of the static determinacy three-hinged arch of different materials under identical external applied load;
In plane framework and three-hinged arch loading experiment, pulley (6) uses movable pulley, and the counterweight weight of flexible cable suspension is level
Pulley is changed to quiet pulley by the size of load in addition to horizontal addload, and weight is hung across a flexible cable, flexible cable one end on pulley
Code, the other end held with dynamometer spring, the pulling force size that comparison counterweight weight is measured with dynamometer spring, calculate flexible cable with it is quiet
Friction coefficient between pulley.
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CN110223573A (en) * | 2019-07-15 | 2019-09-10 | 浙江水利水电学院 | Planar assembling truss static structural analysis experimental provision |
CN111537212A (en) * | 2020-05-22 | 2020-08-14 | 大连理工大学 | Portable geometric composition analysis demonstration experimental device |
CN113689765A (en) * | 2021-08-27 | 2021-11-23 | 重庆交通大学 | Test arch support platform with adjustable span and test method thereof |
CN114023167A (en) * | 2021-11-16 | 2022-02-08 | 盐城工学院 | Rapid demonstration device for burst dissociation constraint experiment |
CN116226956A (en) * | 2022-11-22 | 2023-06-06 | 中交建筑集团有限公司 | Intelligent sliding construction method and system for large-span structure with minimized construction internal force |
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Cited By (9)
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CN110223573A (en) * | 2019-07-15 | 2019-09-10 | 浙江水利水电学院 | Planar assembling truss static structural analysis experimental provision |
CN110223573B (en) * | 2019-07-15 | 2024-02-06 | 浙江水利水电学院 | Plane two-dimensional assembled truss structure static analysis experimental device |
CN111537212A (en) * | 2020-05-22 | 2020-08-14 | 大连理工大学 | Portable geometric composition analysis demonstration experimental device |
CN113689765A (en) * | 2021-08-27 | 2021-11-23 | 重庆交通大学 | Test arch support platform with adjustable span and test method thereof |
CN113689765B (en) * | 2021-08-27 | 2023-05-12 | 重庆交通大学 | Test arch abutment platform with adjustable span and test method thereof |
CN114023167A (en) * | 2021-11-16 | 2022-02-08 | 盐城工学院 | Rapid demonstration device for burst dissociation constraint experiment |
CN114023167B (en) * | 2021-11-16 | 2022-06-21 | 盐城工学院 | Rapid demonstration device for burst resolution constraint experiment |
CN116226956A (en) * | 2022-11-22 | 2023-06-06 | 中交建筑集团有限公司 | Intelligent sliding construction method and system for large-span structure with minimized construction internal force |
CN116226956B (en) * | 2022-11-22 | 2023-08-08 | 中交建筑集团有限公司 | Intelligent sliding construction method and system for large-span structure with minimized construction internal force |
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