CN204102392U - A kind of dynamics experimental device - Google Patents

A kind of dynamics experimental device Download PDF

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Publication number
CN204102392U
CN204102392U CN201420622826.7U CN201420622826U CN204102392U CN 204102392 U CN204102392 U CN 204102392U CN 201420622826 U CN201420622826 U CN 201420622826U CN 204102392 U CN204102392 U CN 204102392U
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China
Prior art keywords
crossbeam
column
pull bar
foil gauge
rod member
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Expired - Fee Related
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CN201420622826.7U
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Chinese (zh)
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何芝仙
罗星
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Anhui Polytechnic University
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Anhui Polytechnic University
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Abstract

The utility model provides a kind of dynamics experimental device being applied to field of experiment equipment, also relate to a kind of method applied described experimental provision and carry out testing simultaneously, column (2) bottom end of described experimental provision is connected with base (1), column (2) other end is connected with crossbeam (3), crossbeam (3) both ends arrange the counterweight support bar dish (4) for placing counterweight (28) respectively, the part that crossbeam (3) is positioned at column (2) both sides pastes foil gauge (29) respectively, each foil gauge (29) is connected with static resistance strainmeter (5) respectively, experimental provision of the present utility model, the bending normal stresses can carrying out crossbeam quickly and easily measures, Subjected To Combined Axial Loading And Bending deformation experiment, the internal force determination experiment of truss, statically determinate structure internal force measures, the multiple Experiments of Machanics such as hyperstatic structure internal force mensuration.Meanwhile, step is easy, simple to operate, can complete test quickly and easily, and test findings accurately and reliably.

Description

A kind of dynamics experimental device
Technical field
The utility model belongs to technical field of experiment equipment, more particularly, relates to a kind of dynamics experimental device, and the utility model also relates to a kind of method applied described experimental provision and carry out testing simultaneously.
Background technology
In the experimental provision that structural mechanics experimental teaching is conventional, the experimental provision that rigid frame or truss are correlated with is more common, and its common feature is apparatus structure type is to change in process of the test.When therefore carrying out different experiments, need to make different experimental provisions, like this, not only increase experimentation cost, and when carrying out different experiments, need to use different experimental provisions, too increase place, laboratory, affect the service efficiency of experimental site.
Utility model content
Technical problem to be solved in the utility model is: for the deficiencies in the prior art, what the utility model proposed is that a kind of bending normal stresses can carrying out crossbeam measures, Subjected To Combined Axial Loading And Bending deformation experiment, the internal force determination experiment of truss, statically determinate structure internal force measures, the dynamics experimental device of the kinds of experiments such as hyperstatic structure internal force mensuration, experimental provision described in the utility model, by changing the pull bar of different structure and sectional dimension between crossbeam and column, realize the conversion between dissimilar structure, particularly between static determinacy and hyperstatic structure, realize convenient conversion.
Solve above-described technical matters, the technical scheme that the utility model is taked is:
The utility model is a kind of dynamics experimental device, described device is a kind of dynamics experimental device, comprise base, column, crossbeam, column bottom one end is connected with base, the column other end is connected with crossbeam, crossbeam both ends arrange the counterweight support bar dish for placing counterweight respectively, and the part that crossbeam is positioned at column both sides pastes foil gauge respectively, and each foil gauge is connected with static resistance strainmeter respectively.
One end that described column is positioned at bottom is vertically connected on base, crossbeam middle part is connected with column middle part, structure in T shape between crossbeam and column, the column upper end of column and left lever and right pull bar are set between crossbeam left part and crossbeam right part respectively.
Described crossbeam left part and crossbeam right part respectively arrange installation engaging lug, column upper end arranges left hole clipping and right hole clipping, left lever and right pull bar two ends arrange gag lever post respectively, two gag lever posts of left lever are set to be stuck in the engaging lug on crossbeam left part and the structure in left hole clipping, two gag lever posts of right pull bar are set to be stuck in the engaging lug on crossbeam right part and the structure in right hole clipping, left lever and right pull bar paste foil gauge respectively, foil gauge is pasted respectively in the four sides of crossbeam left part and crossbeam right part, each foil gauge connects and composes measuring bridge with static resistance strainmeter respectively.
Described column both sides arrange left draw-in groove and right draw-in groove respectively, crossbeam comprises left transverse beam assembly and right transverse beam assembly, one end that left transverse beam assembly is connected with column arranges left head clamp, one end that right transverse beam assembly is connected with column arranges right head clamp, left head clamp and right head clamp are installed in left draw-in groove and right draw-in groove respectively, left draw-in groove and right draw-in groove both sides arrange 3 bolts respectively, bolt is set to respectively left transverse beam assembly and right transverse beam assembly are clamped on the structure in left draw-in groove and right draw-in groove, when adopting 1 bolt be positioned on crossbeam center line to connect, form chain connection, when employing 3 bolts connect, form stiff end to connect.
Described left lever comprises left rod member I and left rod member II, connected by adjusting screw(rod) I between left rod member I and left rod member II, right pull bar comprises right rod member I and right rod member II, connected by adjusting screw(rod) II between right rod member I and right rod member II, the foil gauge that left lever and right pull bar are pasted and static resistance strainmeter connect and compose measuring bridge, and described base 1 is set to decussate texture.
The utility model also relates to simultaneously a kind ofly applies the method that above-mentioned dynamics experimental device carries out statically determinate structure experiment, and the described step of carrying out statically determinate structure experiment is:
Crossbeam and column are connected into T-shaped structure, and formation stiff end all installed by 3 bolts, divides 2 groups and tests simultaneously.By the measuring bridge of the foil gauge of crossbeam left part and crossbeam right part access static resistance strainmeter, adopt single armed half-bridge connection, namely be active gage by the foil gauge on crossbeam left part and crossbeam right part respectively, crossbeam right part foil gauge is temperature compensation sheet, do not select again the foil gauge of person's not stand under load as temperature compensation sheet, divide 2 groups to load counterweight at the counterweight support bar dish of crossbeam left part and crossbeam right part simultaneously, adopt equivalent stepwise loading method, measure the strain value of the active gage of crossbeam left part and crossbeam right part, according to formula σ measure=E ε measurecalculate the stress at crossbeam left part and active gage place, crossbeam right part, respectively with the bending normal stresses comparison of computational results in the mechanics of materials, calculate relative error, verification computation formula correctness.This is the shear bending normal stress experiment of beam.
The described step of carrying out statically determinate structure experiment is:
1) crossbeam and column are connected into T-shaped structure, only be positioned at 1 bolt on crossbeam center line, form chain connection, left lever and right pull bar are installed again, form static determinacy triangle rack and panel construction, its middle cross beam by compression with bending combined deformation, left lever and right pull bar Tensile distortion.Respectively by crossbeam left part, crossbeam right part, the foil gauge access static resistance strainmeter of left lever and right pull bar forms measuring bridge, adopt single armed half-bridge connection and equivalent stepwise loading method, first the pull bar that diameter is 10mm is used, measure left lever, the strain of right pull bar, again according to the stress at σ=E ε evaluation work sheet place and the axle power of pull bar, compare with the calculated results of mechanics of materials stretcher strain, calculate relative error, measure the strain of the active gage at crossbeam left part and crossbeam right part place simultaneously, with stretching compared with the result of calculation of bending combined deformation, calculate relative error,
2) under keeping loading the constant prerequisite of load, change the left lever of dissimilar and size and right pull bar, the strain value observing the foil gauge on the axle power of left lever and right pull bar and left lever and right pull bar has unchanged; The foil gauge place strain observing crossbeam left part and crossbeam right part has unchanged, if unchanged, illustrates that the internal force of statically determinate structure has nothing to do with bar material and sectional dimension;
3) under keeping loading the constant prerequisite of load, regulate the length of left lever and right pull bar, the strain value of the foil gauge on observation crossbeam left part, crossbeam right part, left lever and right pull bar has unchanged; If unchanged, illustrate that the foozle of statically determinate structure internal force and left lever and right pull bar has nothing to do.
4) left lever and right pull bar truss-frame structure are substituted, repeat above-mentioned steps 1) ~ 2), be exactly the Experiments of Machanics of truss-frame structure.
The utility model also relates to simultaneously a kind ofly applies the method that above-mentioned dynamics experimental device carries out hyperstatic structure experiment, and the described step of carrying out hyperstatic structure experiment is:
1) crossbeam and column are connected into T-shaped structure, formation stiff end all installed by 3 bolts, installs left lever and right pull bar, forms indeterminate triangle rack and panel construction; Respectively crossbeam is positioned at the measuring bridge of the foil gauge access static resistance strainmeter of column both sides;
2) adopt single armed half-bridge connection and equivalent stepwise loading method, measure the strain value of the foil gauge at left lever and right pull bar place, compared with the result of calculation obtained with the method solving hyperstatic structure in structural mechanics, calculate relative error;
3) keep loading load constant, rotate the adjusting handle on left lever and right pull bar, elongate or shorten left lever and right pull bar length, simulate foozle on left lever and right pull bar, the strain value of observation crossbeam left part, crossbeam right part place foil gauge has unchanged, if change, illustrate that the foozle of the internal force of hyperstatic structure and left lever and right pull bar is closely related;
4) under keeping loading the constant prerequisite of load, change dissimilar and brace that is size, the strain value observing crossbeam left part and crossbeam right part place foil gauge has unchanged, if change, illustrates that the internal force of hyperstatic structure is relevant with sectional dimension with the material of left lever and right pull bar.
Adopt the technical solution of the utility model, following beneficial effect can be obtained:
Dynamics experimental device described in the utility model, by changing the connection type of column and crossbeam or changing the left lever of different structure and sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional dynamics experimental device, the kinds of experiments such as internal force determination experiment, statically determinate structure internal force mensuration, hyperstatic structure internal force mensuration of the bending normal stresses mensuration of crossbeam, Subjected To Combined Axial Loading And Bending deformation experiment, truss can be carried out quickly and easily, applied widely, experimental procedure is easy, simple to operate, test findings accurately and reliably.Experimental provision described in the utility model adopts symmetric triangular rack and panel construction, and compact conformation, can carry out simultaneously, improve test efficiency in 2 groups of experiments.
Accompanying drawing explanation
Brief description is made to the content expressed by each accompanying drawing of this instructions and the mark in figure below:
Fig. 1 be dynamics experimental device described in the utility model face structural representation;
The sectional structure schematic diagram in the A-A face that Fig. 2 is the dynamics experimental device described in Fig. 1; ;
Accompanying drawing acceptance of the bid note is respectively: 1, base; 2, column; 3, crossbeam; 4, counterweight support bar dish; 5, static resistance strainmeter; 6, column upper end; 7, crossbeam left part; 8, crossbeam right part; 9, left lever; 10, right pull bar; 11, engaging lug; 12, left hole clipping; 13, right hole clipping; 14, left draw-in groove; 15, right draw-in groove; 16, left transverse beam assembly; 17, right transverse beam assembly; 18, left head clamp; 19, right head clamp; 20, bolt; 21, left rod member I; 22, left rod member II; 23, adjusting screw(rod) I; 24, right rod member I; 25, right rod member II; 26, adjusting screw(rod) II; 27, gag lever post; 28, counterweight; 29, foil gauge.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the effect and principle of work etc. of embodiment of the present utility model as the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part are described in further detail:
As shown in accompanying drawing 1, accompanying drawing 2, the utility model is a kind of dynamics experimental device, described experimental provision comprises base 1, column 2, crossbeam 3, column 2 bottom end is connected with base 1, column 2 other end is connected with crossbeam 3, crossbeam 3 both ends arrange the counterweight support bar dish 4 for placing counterweight 28 respectively, and the part that crossbeam 3 is positioned at column 2 both sides pastes foil gauge 29 respectively, and each foil gauge 29 is connected with static resistance strainmeter 5 respectively.By changing the connection type of column and crossbeam or changing the left lever of different structure, material and sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional experimental provision, the Experiments of Machanics such as internal force determination experiment, statically determinate structure internal force mensuration, the hyperstatic structure internal force mensuration measurement of the bending normal stresses mensuration of crossbeam, Subjected To Combined Axial Loading And Bending deformation experiment, truss can be carried out quickly and easily, owing to adopting symmetric triangular rack and panel construction, can 2 groups of experiments carry out simultaneously, and measuring process is convenient, measurement data is accurate.
One end that described column 2 is positioned at bottom is vertically connected on base 1, crossbeam 3 middle part is connected with column 2 middle part, structure in T shape between crossbeam 3 and column 2, the upper end 6 of column 2 and left lever 9 and right pull bar 10 are set between crossbeam left part 7 and crossbeam right part 8 respectively.Left lever 9 and right pull bar 10 can be replaced by experimentation has different materials, different cross section shape and size pull bar, or is replaced by the pull bar of truss-frame structure form, is convenient to carry out mechanical meaurement.
Described crossbeam left part 7 and crossbeam right part 8 respectively arrange installation engaging lug 11, column upper end 6 arranges left hole clipping 12 and right hole clipping 13, left lever 9 and right pull bar 10 two ends arrange gag lever post 27 respectively, two gag lever posts 27 of left lever 9 are set to be stuck in the engaging lug 11 on crossbeam left part 7 and the structure in left hole clipping 12, two gag lever posts 27 of right pull bar 10 are set to be stuck in the engaging lug 11 on crossbeam right part 8 and the structure in right hole clipping 13, left lever 9 and right pull bar 10 paste foil gauge respectively, foil gauge is pasted respectively in the four sides of crossbeam left part 7 and crossbeam right part 8, each foil gauge is connected with static resistance strainmeter 5 respectively and forms measuring bridge.Said structure, achieves the reliable connection of left lever and right pull bar, and left lever and right pull bar remove and install convenient and swift, can effectively improve carrying out of experimental work.
Described column 2 both sides arrange left draw-in groove 14 and right draw-in groove 15 respectively, crossbeam 3 comprises left transverse beam assembly 16 and right transverse beam assembly 17, one end that left transverse beam assembly 16 is connected with column 2 arranges left head clamp 18, one end that right transverse beam assembly 17 is connected with column 2 arranges right head clamp 19, left head clamp 18 and right head clamp 19 are installed in left draw-in groove 14 and right draw-in groove 15 respectively, left draw-in groove 14 and right draw-in groove 15 both sides arrange 3 bolts 20 respectively, bolt 20 is set to respectively left transverse beam assembly 16 and right transverse beam assembly 17 are clamped on the structure in left draw-in groove 14 and right draw-in groove 15.By such structure, left transverse beam assembly 16 can be realized and right transverse beam assembly 17 is connected and dismounting with the reliable of column both sides respectively, be convenient to Experiments of Machanics work and conveniently carry out.
Described left lever 9 comprises left rod member I 21 and left rod member II 22, connected by adjusting screw(rod) I 23 between left rod member I 21 and left rod member II 22, right pull bar 10 comprises right rod member I 24 and right rod member II 25, connected by adjusting screw(rod) II 26 between right rod member I 24 and right rod member II 25, left lever 9 is connected with static resistance strainmeter 5 respectively with the foil gauge that right pull bar 10 is pasted and forms measuring bridge.
Described base 1 is set to decussate texture, improves stability when base is placed.
The utility model also relates to simultaneously a kind ofly applies the method that above-mentioned dynamics experimental device carries out statically determinate structure experiment, and can complete statically determinate structure experiment quickly and easily, the described step of carrying out statically determinate structure experiment is:
Crossbeam 3 and column 2 are connected into T-shaped structure, and formation stiff end all installed by 3 bolts, divides 2 groups and tests simultaneously.By the measuring bridge of the foil gauge of crossbeam left part 7 and crossbeam right part 8 access static resistance strainmeter 5, adopt single armed half-bridge connection, foil gauge on crossbeam left part 7 and crossbeam right part 8 is as active gage, do not select again the foil gauge of person's not stand under load as temperature compensation sheet, counterweight is loaded at the counterweight support bar dish 4 of crossbeam left part 7, adopt equivalent stepwise loading method, measure the strain value of the active gage of crossbeam left part 7 and crossbeam right part 8, according to formula σ measure=E ε measurecalculate the stress at crossbeam left part 7 and active gage place, crossbeam right part 8, respectively with the bending normal stresses comparison of computational results in the mechanics of materials, calculate relative error, verification computation formula correctness.This is the shear bending normal stress experiment of beam.
1) crossbeam 3 and column 2 are connected into T-shaped structure, only be positioned at 1 bolt on crossbeam center line, form chain connection, left lever 9 and right pull bar 10 are installed again, form static determinacy triangle rack and panel construction, its middle cross beam 5 by compression with bending combined deformation, left lever 9 and right pull bar 10 Tensile distortion.Respectively by crossbeam left part 7, crossbeam right part 8, the foil gauge access static resistance strainmeter 5 of left lever 9 and right pull bar 10 forms measuring bridge, adopt single armed half-bridge connection and equivalent stepwise loading method, first the pull bar that diameter is 10mm is used, measure left lever 9, the strain of right pull bar 10, again according to the stress at σ=E ε evaluation work sheet place and the axle power of pull bar, compared with the calculated results of mechanics of materials stretcher strain, calculate relative error, measure the strain of the active gage at crossbeam left part 7 and crossbeam right part 8 place simultaneously, with stretching compared with the result of calculation of bending combined deformation, calculate relative error,
2) under keeping loading the constant prerequisite of load, change left lever 9 and the right pull bar 10 of dissimilar and size, the strain value observing the foil gauge on the axle power of left lever 9 and right pull bar 10 and left lever 9 and right pull bar 10 has unchanged; The foil gauge place strain observing crossbeam left part 7 and crossbeam right part 8 has unchanged, if unchanged, illustrates that the internal force of statically determinate structure has nothing to do with bar material and sectional dimension;
3) under keeping loading the constant prerequisite of load, regulate the length of left lever 9 and right pull bar 10, the strain value of the foil gauge on observation crossbeam left part 7, crossbeam right part 8, left lever 9 and right pull bar 10 has unchanged; If unchanged, illustrate that statically determinate structure internal force and crossbeam 3 foozle have nothing to do.
4) left lever and right pull bar truss-frame structure are substituted, repeat above-mentioned steps 1) ~ 2), be exactly the Experiments of Machanics of truss-frame structure.
The utility model also relates to simultaneously a kind ofly applies the method that above-mentioned dynamics experimental device carries out hyperstatic structure experiment, and can complete hyperstatic structure experiment quickly and easily, the described step of carrying out hyperstatic structure experiment is:
1) crossbeam 3 and column 2 are connected into T-shaped structure, formation stiff end all installed by 3 bolts, installs left lever and right pull bar, forms indeterminate triangle rack and panel construction; Respectively crossbeam 3 is positioned at the measuring bridge of the foil gauge access static resistance strainmeter 5 at position, column 2 both sides, left lever 9 and right pull bar 10 is installed, forms indeterminate triangle rack and panel construction;
2) adopt single armed half-bridge connection and equivalent stepwise loading method, measure the strain value of the foil gauge at left lever 9 and right pull bar 10 place, compared with the result of calculation obtained with the method solving hyperstatic structure in structural mechanics, calculate relative error;
3) keep loading load constant, rotate the adjusting screw(rod) I 23 on left lever 9 and right pull bar 10 and adjusting screw(rod) II 26, elongate or shorten left lever 9 and right pull bar 10 length, simulate foozle on left lever 9 and right pull bar 10, the strain value of observation crossbeam left part 7, crossbeam right part 8 place foil gauge has unchanged, if change, illustrate the internal force of hyperstatic structure and left lever 9, right pull bar 10 foozle closely related;
4) under keeping loading the constant prerequisite of load, change dissimilar and brace that is size, the strain value observing crossbeam left part 7 and crossbeam right part 8 place foil gauge has unchanged, if change, illustrate that the internal force of hyperstatic structure is relevant with sectional dimension with the material of left lever 9, right pull bar 10.
Dynamics experimental device described in the utility model, change the connection type of column and crossbeam or change the left lever of different materials, structure and sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional dynamics experimental device, the kinds of experiments such as internal force determination experiment, statically determinate structure internal force mensuration, hyperstatic structure internal force mensuration of the bending normal stresses mensuration of crossbeam, Subjected To Combined Axial Loading And Bending deformation experiment, truss can be carried out quickly and easily, applied widely, experimental procedure is easy, simple to operate, test findings accurately and reliably.Experimental provision described in the utility model adopts symmetric triangular rack and panel construction, and compact conformation, can carry out simultaneously, improve test efficiency in 2 groups of experiments.
By reference to the accompanying drawings exemplary description is carried out to the utility model above; the concrete realization of obvious the utility model is not subject to the restrictions described above; as long as have employed the various improvement that method of the present utility model is conceived and technical scheme is carried out; or design of the present utility model and technical scheme directly applied to other occasions, all in protection domain of the present utility model without to improve.

Claims (5)

1. a dynamics experimental device, it is characterized in that: described experimental provision comprises base (1), column (2), crossbeam (3), column (2) bottom end is connected with base (1), column (2) other end is connected with crossbeam (3), crossbeam (3) both ends arrange the counterweight support bar dish (4) for placing counterweight (28) respectively, the part that crossbeam (3) is positioned at column (2) both sides pastes foil gauge (29) respectively, and each foil gauge (29) is connected with static resistance strainmeter (5) respectively.
2. dynamics experimental device according to claim 1, it is characterized in that: one end that described column (2) is positioned at bottom is vertically connected on base (1), crossbeam (3) middle part is connected with column (2) middle part, structure in T shape between crossbeam (3) and column (2), the column upper end (6) of column (2) and left lever (9) and right pull bar (10) are set between crossbeam left part (7) and crossbeam right part (8) respectively.
3. dynamics experimental device according to claim 2, it is characterized in that: described crossbeam left part (7) and crossbeam right part (8) are upper respectively arranges installation engaging lug (11), column upper end (6) arranges left hole clipping (12) and right hole clipping (13), left lever (9) and right pull bar (10) two ends arrange gag lever post (27) respectively, two gag lever posts (27) of left lever (9) are set to be stuck in the engaging lug (11) on crossbeam left part (7) and the structure in left hole clipping (12), two gag lever posts (27) of right pull bar (10) are set to be stuck in the engaging lug (11) on crossbeam right part (8) and the structure in right hole clipping (13), left lever (9) and right pull bar (10) paste foil gauge respectively, each foil gauge connects and composes measuring bridge with static resistance strainmeter (5) respectively, foil gauge is pasted respectively in the four sides in the centre position of crossbeam left part (7) and crossbeam right part (8).
4. dynamics experimental device according to claim 3, it is characterized in that: described column (2) both sides arrange left draw-in groove (14) and right draw-in groove (15) respectively, crossbeam (3) comprises left transverse beam assembly (16) and right transverse beam assembly (17), one end that left transverse beam assembly (16) is connected with column (2) arranges left head clamp (18), one end that right transverse beam assembly (17) is connected with column (2) arranges right head clamp (19), left head clamp (18) and right head clamp (19) are installed in left draw-in groove (14) and right draw-in groove (15) respectively, left draw-in groove (14) and right draw-in groove (15) both sides arrange bolt (20) respectively, bolt (20) is set to respectively left transverse beam assembly (16) and right transverse beam assembly (17) are clamped on the structure in left draw-in groove (14) and right draw-in groove (15).
5. dynamics experimental device according to claim 4, it is characterized in that: described left lever (9) comprises left rod member I (21) and left rod member II (22), connected by adjusting screw(rod) I (23) between left rod member I (21) and left rod member II (22), right pull bar (10) comprises right rod member I (24) and right rod member II (25), connected by adjusting screw(rod) II (26) between right rod member I (24) and right rod member II (25), left lever (9) and right pull bar (10) paste foil gauge respectively, and be connected with static resistance strainmeter (5), described base (1) is set to decussate texture.
CN201420622826.7U 2014-10-25 2014-10-25 A kind of dynamics experimental device Expired - Fee Related CN204102392U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104269088A (en) * 2014-10-25 2015-01-07 安徽工程大学 Mechanical experimental device and method for conducting experiment by applying same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104269088A (en) * 2014-10-25 2015-01-07 安徽工程大学 Mechanical experimental device and method for conducting experiment by applying same

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