CN202275541U - Stability dynamics experimental device - Google Patents
Stability dynamics experimental device Download PDFInfo
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- CN202275541U CN202275541U CN2011204314226U CN201120431422U CN202275541U CN 202275541 U CN202275541 U CN 202275541U CN 2011204314226 U CN2011204314226 U CN 2011204314226U CN 201120431422 U CN201120431422 U CN 201120431422U CN 202275541 U CN202275541 U CN 202275541U
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Abstract
The utility model provides a stability dynamics experimental device comprising a sliding groove rack, wherein two supports are arranged at left and right two ends of the sliding groove rack; the top ends of the two supports are connected with a plane truss composed of seven spring steel rectangular section rods; each section rod is respectively stuck with a strain rosette; a first lift sub is arranged at the intersection position of the four rods of the plane truss; the first lift sub is connected with a flexible cable and the other end of the flexible cable is connected with a second lift sub through a bypass wheel; the second lift sub is hinged with a lever of a loading mechanism; the lever is hinged with the supports; a sliding weight is arranged at the left side of the lever, a weight swinging tray is suspended at the left ends of the supports and an initial balance adjustment weight is connected with the right ends of the supports by a bolt. According to the device provided by the utility model, a dynamic process of varying dynamics models, gradually increasing and continuously and directly applying a load, dynamically and continuously measuring a critical load of the structure in real time, and accurately capturing and directly displaying the instability sudden of the structure in time is realized; and therefore, the stability dynamics experimental device has very positive and important meanings of strengthening the cultivation of comprehensive practice abilities of students and stimulating the students to comprehend, evaluate and deeply think about the stability of the structure.
Description
Technical field
The utility model relates to the Experiments of Machanics field, particularly a kind of stable Experiments of Machanics device.
Background technology
Present existing strut stability Experiments of Machanics method and apparatus; Mostly only limit to traditional single depression bar, apply its critical load of axial displacement mensuration, its mechanical model is single, the sudden mechanical behavior of strut buckling can not intuitively represent, strut buckling causes the danger of serious consequence more can not reflect to the total load-bearing capacity.
Summary of the invention
In order to overcome the defective of above-mentioned prior art; The purpose of the utility model is to provide a kind of stable Experiments of Machanics device; Can realize that mechanical model is multiple, divide increment and continuously directly the critical load of imposed load, Real-time and Dynamic METHOD FOR CONTINUOUS DETERMINATION structure, accurately and timely catch and directly represent the sudden dynamic process of structural instability, cultivate, excite the student that structural stability is understood, estimated and deeply thinking aspect has the meaning of positive important for strengthening student's integrated practice ability.
In order to achieve the above object, the technical scheme of the utility model is achieved in that
A kind of stable Experiments of Machanics device; Comprise band chute stand 1, the top that the right ends of chute stand 1 is provided with 3, two pillars 3 of two pillars is connected with the plane girder that is made up of seven spring steel square-section bars 2; One piece of cross strain rosette 5 is axially respectively pasted along bar in the thickness two sides of each bar 2 middle part, spring steel square-section; Plane girder four bar intersections are provided with first elevator, 7, the first elevators 7 and connect gentle rope 6, and the other end of gentle rope 6 connects second elevator 9 through walking around fixed wheel 8; Second elevator 9 is hinged on the load maintainer lever 11; Lever 11 is hinged in pillar 10, and sliding weight 12, lever 11 left ends suspension counterweight hanging scaffold 13 are arranged on lever 11 left sides, and lever 11 right-hand member bolt initial balances are regulated stone roller 14.
High-order horizon bar in described seven spring steel square-section bars 2 is replaced by the measure-alike or different stock of shape of cross section; The described plane girder that is made up of seven spring steel square-section bars 2 has five nodes 4, and the connected mode at node 4 places is hinged or the hinged other end of an end is fixed or two ends are fixed.
The utility model has constituted truss structural stability Experiments of Machanics device, can leave the truss structural stability Experiments of Machanics project of different constraints and different pole lengths.During experiment; Require and numerical evaluation simulation results autonomous Design experimental program according to the experimental duties book by the student fully; To each test operating mode, with the good TCH test channel that inserts the dynamic strain tester that is placed on the experimental provision next door of signal wire of strain rosette 5, rational full-bridge of winding or half-bridge; Measure truss-frame structure under the corresponding operating mode critical load and the Changing Pattern of each bar bearing load of whole process, the unstable phenomenon of observation structure.This utility model has that physical dimension is adjustable, mechanical boundary is multiple, testing scheme is various, group bridge form is changeable, also has advantages such as novel and reasonable design, compact conformation be small and exquisite, easy for operation.Especially cultivate, excite the student structural stability understanding, evaluation and deeply thinking aspect to be had the meaning of positive important for strengthening student's integrated practice ability.
Description of drawings
Fig. 1 is the front view of the utility model.
Fig. 2 is the perspective view of the utility model.
Embodiment
Be described in detail below in conjunction with the structural principle and the principle of work of accompanying drawing the utility model.
A kind of stable Experiments of Machanics device; Comprise band chute stand 1; The top that the right ends of chute stand 1 is provided with 3, two pillars 3 of two pillars is connected with the plane girder that is made up of seven spring steel square-section bars 2, and one piece of cross strain rosette 5 is axially respectively pasted along bar in the thickness two sides of each bar 2 middle part, spring steel square-section; Plane girder four bar intersections are provided with first elevator 7; First elevator 7 connects gentle rope 6, and the other end of gentle rope 6 is hinged on the load maintainer lever 11 through walking around fixed wheel 8 connections second elevator 9, the second elevators 9; Lever 11 is hinged in pillar 10; Sliding weight 12, lever 11 left ends suspension counterweight hanging scaffold 13 is arranged on lever 11 left sides, and the bottom that lever 11 right-hand member bolt initial balances are regulated stone roller 14, two pillars 3, fixed wheel 8 supporting constructions and pillars 10 is installed in the chute of chute stand 1 and can slides along chute.
High-order horizon bar in described seven spring steel square-section bars 2 is replaceable to be the measure-alike or different stock of shape of cross section; The described plane girder that is made up of seven spring steel square-section bars 2 has five nodes 4; The connected mode at node 4 places is hinged or the hinged other end of an end is fixed or two ends are fixed, forms the variation that different mechanical models have its instability forms under the multiple boundary condition situation.
The principle of work of the utility model is:
According to design and experimental program voluntarily through confirming, be truss structural with bar 2 two ends, seven spring steel square-sections with good connection of articulated form, and hinged be supported in stand 1 about on two pillars 3; Insert the signal wire of the cross strain rosette 5 on the spring steel square-section bar 2 TCH test channel of the dynamic strain tester that is placed on the experimental provision next door; Winding becomes rational full-bridge with test internal force separation principle according to the Wheatstone bridge output characteristics, can eliminate the buckling effect of power, the axial force of accurate analyzing rod, can improve measurement sensitivity again; After this; Regulate gentle rope 6, first elevator 7, second elevator 9, sliding weight 12 is in zero-bit and initial balance is regulated stone roller 14, makes load maintainer be in natural balanced state, when load is zero; Test macro initial balance, strain zero clearing; Then, the counterweight classification is put on the counterweight hanging scaffold 13, simultaneously the corresponding cascade sampling of test macro according to the experiment loading scheme; Afterbody load is to move sliding weight 12, the sampling of test macro real-time continuous at the uniform velocity continuously, until the unexpected unstability of truss structural; When the constraint Replacement Part that node 4 two ends of seven spring steel square-section bars 2 is used configuration is truss structural with good connection of form fixed or that the hinged other end of an end is fixed; Perhaps the high-order horizon bar in seven spring steel square-section bars 2 is replaced by the bar of different length; And good connection of form hinged with two ends or that the hinged other end of an end is fixed or two ends are fixed is truss structural; Roughly the same the strain of abovementioned steps imposed load scheme, each bar of test total embodies the variation of its instability forms under the different situations.Calculate definite its critical load according to the test data of variant mechanical model; Analyze the Changing Pattern of each bar bearing load of whole procedure structure; The observation of the sudden dynamic process of integrated structure unstability; Further deeply think deeply the structural stability problem with innovative thinking, for effective evaluation and design safety, economy, novel structure are established solid foundation.
Claims (3)
1. a stable Experiments of Machanics device is characterized in that, comprises band chute stand (1); The right ends of chute stand (1) is provided with two pillars (3); The top of two pillars (3) is connected with the plane girder that is made up of seven spring steel square-section bars (2), and one piece of cross strain rosette (5) is axially respectively pasted along bar in the thickness two sides of each spring steel square-section bar (2) middle part, and plane girder four bar intersections are provided with first elevator (7); First elevator (7) connects gentle rope (6); The other end of gentle rope (6) connects second elevator (9) through walking around fixed wheel (8), and second elevator (9) is hinged on the load maintainer lever (11), and lever (11) is hinged in pillar (10); Sliding weight (12), lever (11) left end suspension counterweight hanging scaffold (13) are arranged on lever (11) left side, and lever (11) right-hand member bolt initial balance is regulated stone roller (14).
2. a kind of stable Experiments of Machanics device according to claim 1 is characterized in that the high-order horizon bar in described seven spring steel square-section bars (2) is replaced by the measure-alike or different stock of shape of cross section.
3. a kind of stable Experiments of Machanics device according to claim 1 and 2; It is characterized in that; The described plane girder that is made up of seven spring steel square-section bars (2) has five nodes (4), and the connected mode that node (4) is located is hinged or the hinged other end of an end is fixed or two ends are fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204314226U CN202275541U (en) | 2011-11-03 | 2011-11-03 | Stability dynamics experimental device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204314226U CN202275541U (en) | 2011-11-03 | 2011-11-03 | Stability dynamics experimental device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202275541U true CN202275541U (en) | 2012-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204314226U Expired - Fee Related CN202275541U (en) | 2011-11-03 | 2011-11-03 | Stability dynamics experimental device |
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| Country | Link |
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| CN (1) | CN202275541U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426808A (en) * | 2011-11-03 | 2012-04-25 | 西安交通大学 | Planar truss structural stability mechanics experimental apparatus |
| CN103473971A (en) * | 2013-07-24 | 2013-12-25 | 陈尚松 | Structural-stability demonstration instrument |
-
2011
- 2011-11-03 CN CN2011204314226U patent/CN202275541U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426808A (en) * | 2011-11-03 | 2012-04-25 | 西安交通大学 | Planar truss structural stability mechanics experimental apparatus |
| CN103473971A (en) * | 2013-07-24 | 2013-12-25 | 陈尚松 | Structural-stability demonstration instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120613 Termination date: 20141103 |
|
| EXPY | Termination of patent right or utility model |