CN101968398B - Dynamic property testing platform for movable mass simply-supported beam - Google Patents
Dynamic property testing platform for movable mass simply-supported beam Download PDFInfo
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- CN101968398B CN101968398B CN2010105085101A CN201010508510A CN101968398B CN 101968398 B CN101968398 B CN 101968398B CN 2010105085101 A CN2010105085101 A CN 2010105085101A CN 201010508510 A CN201010508510 A CN 201010508510A CN 101968398 B CN101968398 B CN 101968398B
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Abstract
The invention discloses a dynamic property testing platform for a movable mass simply-supported beam. The dynamic property testing platform is characterized in that: a supporting piece is arranged at two ends of a flat plate respectively, and two ends of the simply-supported beam are arranged on the supporting pieces at the two ends respectively; a mass block capable of moving on the simply-supported beam is placed on the simply-supported beam; two end pull ropes are fixedly connected at the radial symmetrical positions of the mass block, wherein one end pull rope is a driving end driven by a step motor, transmitted by a synchronous belt pulley and a transmission shaft and wound by a driving drum; the other end pull rope is a driven end; and vibration acceleration sensors are uniformly arranged at the bottom of the simply-supported beam along the moving direction of the mass block. The dynamic property testing platform can be used for testing the dynamic property parameters of the simply-supported beam when the mass is changed, the mass block moves at different speeds and the mass block is at different spatial positions, is used for an identification method for variable systems in parameter simulation and variable parameters in inspection, and also can be further used for active control of vibration of the simply-supported beam.
Description
Technical field
The present invention relates to a kind ofly, more specifically relate to a kind of free beam dynamic characteristic test platform of the mass change under self excitation, hammering or shaking table incentive action by the moving mass free beam dynamic characteristic test platform under the excitation generating means effect.
Background technology
The structural system of parameter time varying has a lot of exemplary in real engineering, like the car-bridge system of train or the formation of vehicle gap bridge, the parameter change system that rocket launching process fuel consumption forms, the tower crane system when weight moves on the building ground etc.Dynamics datas such as the inertial parameter of these systems, modal parameter, load, internal stress are time dependent.Control for the state of grasping these systems and to them, need to obtain in real time the kinetic parameter of its variation.Vibrational excitation that can be through gathering these systems and response data also obtain the kinetic parameter of its variation through certain algorithm.For accuracy and the validity of verifying the time-varying parameter identification algorithm; Needing an adjustable time-varying system experiment porch of parameter variation verifies; The time kinetic parameter that becomes of this system must have theoretical solution; Just can compare, thereby can verify the feasibility and the validity of time-varying parameter identification algorithm with the result of calculation of algorithm.And this experiment porch preferably can as much as possiblely provide the version of time-varying parameter, such as the slow deformation type of parameter, the fast deformation type of parameter, parameter transition form etc.The open report that does not have relevant experiment porch so far.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point; Speed that provides one the mass size can change, quality moves and direction can regulate based on moving mass free beam dynamic characteristic test platform; The vibration acceleration response of each measuring point on the exciting force of free beam and the beam when being used to measure quality and moving; Calculate for the time-varying parameter identification algorithm; And with theoretical value relatively, satisfy the needs of the feasibility and the validity of check algorithm, as the experiment porch of colleges and universities' specialized course teaching and scientific research.
Technical solution problem of the present invention adopts following technical scheme:
The design feature of moving mass free beam dynamic characteristic test platform of the present invention is:
Two ends at flat board are provided with a support member respectively, and the two ends of free beam are installed in respectively on the supporting member at two ends; Placing the mass that on free beam, to move on the free beam, the stacking quantity and can regulate of mass; On the radial symmetry position of mass, be fixedly connected with the two ends drag-line, an end drag-line is by step motor drive, the drive end of reeling by synchronous pulley and transmission shaft transmission, by the active reel; Other end drag-line is a Partner;
Moving direction in the bottom of free beam along mass evenly is provided with vibration acceleration sensor; Constitute detecting signal unit by vibration signals collecting conditioning module, single-chip microcomputer and vibration acceleration sensor, single-chip microcomputer obtains the detection signal of vibration acceleration sensor through the vibration signals collecting conditioning module; Stepper motor is accepted the control signal from single-chip microcomputer, and single-chip microcomputer receives the control signal from the Electric Machine Control button.
The design feature of moving mass free beam dynamic characteristic test platform of the present invention also is: on free beam, along the length direction of free beam guide groove is set; In the bottom of mass the guiding projection is set; In guide groove, mass can be moved with the intercalation of guiding projection along guide groove.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, the mass among the present invention is under the traction of drag-line, to move with the speed of setting; The output signal of vibration acceleration sensor is gathered and is nursed one's health by the vibration signals collecting conditioning system; Data analysis through further computing machine; The vibration acceleration response of each measuring point on the exciting force of free beam and the beam when recording quality and moving can satisfy the needs of the feasibility and the validity of check algorithm, can be used as the experiment porch of colleges and universities' specialized course teaching and scientific research.
2, the quantity of the translational speed of the present invention through changing the quality of regulation piece, mass and moving direction can analog parameter become slowly, become soon and the system of transition system and the coupling of various parameter change type, can satisfy the demand of checking multiple time-varying parameter identification algorithm.
3, the present invention utilize a stepper motor and synchronously band, synchronizing wheel mechanism just realized reel initiatively and by the unwrapping wire of movable reel and take-up synchronously; Thereby realized mass to-and-fro movement and and with being synchronized with the movement of stepper motor, when having avoided the speed flip-flop because inertia makes the motion delay of mass.
4, the present invention through control button and chip microcontroller mass move and the sampling of vibration acceleration sensor in time synchronously.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a drive end synoptic diagram of the present invention;
Fig. 3 is a Partner synoptic diagram of the present invention.
Label among the figure: 1 free beam, 2 masses, 3 fixed pulleys, 4 support members, 5 initiatively reels, 6 transmission shafts, 7 supports, 8 synchronous pulleys, the support of 9 stepper motors, 10 stepper motors, 11 stepper motor drivers, 12 single-chip microcomputers, 13 Switching Power Supplies, 14 Electric Machine Control buttons, 15 be with synchronously, 16 flat boards, 17 drag-lines, 18 vibration acceleration sensors, 19 computing machines, 20 vibration signals collecting conditioning module.
Embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, at dull and stereotyped 16 two ends one support member 4 is set respectively, free beam 1 is installed on the supporting member 4; Placing the mass 2 that can on free beam 1, move on the free beam 1, mass 2 can be a weights, the stacking quantity and can regulate of mass 2; On the radial symmetry position of mass 2, be fixedly connected with the two ends drag-line, an end drag-line is the drive end that is driven, reeled by synchronous pulley 8 and transmission shaft 6 transmissions, by active reel 5 by stepper motor 10; Other end drag-line is a Partner, between the synchronous pulley of drive end and Partner, is provided with and is with 15 synchronously;
Moving direction in the bottom of free beam 1 along mass evenly is provided with vibration acceleration sensor 18; Constitute detecting signal unit by vibration signals collecting conditioning module 20, single-chip microcomputer 12 and vibration acceleration sensor 18, single-chip microcomputer 12 obtains the detection signal of vibration acceleration sensor 18 through vibration signals collecting conditioning module 20; The control signal that stepper motor 10 is accepted from single-chip microcomputer 12, the control signal that single-chip microcomputer 12 receives from the Electric Machine Control button.
In the practical implementation, the corresponding structure setting also comprises:
On free beam 1, guide groove is set along the length direction of free beam 1, in the bottom of mass 2 the guiding projection is set, in guide groove, mass 2 can be moved with the intercalation of guiding projection along guide groove, the piece travel direction of ensuring the quality of products is avoided its landing free beam.
Be respectively arranged with fixed pulley 3 in the outside of two end supports part 4; Two ends drag-line 17 walk around respectively separately fixed pulley at one end; Initiatively the rotation axis 6 of reel 5 is to support 7 by axle to carry, driven by stepper motor 10; Synchronous pulley 8 drive simultaneously be in the other end by movable reel, make the reel of an end discharge drag-line rope, the reel coiling drag-line of the other end.
Corresponding setting also comprises:
The present invention can have two kinds of use-patterns:
1, external drive mode: stepper motor rotates with the speed of setting; When mass moves; Firmly hammer knocks the upper surface of free beam, and perhaps with the lower surface of shaking table excitation free beam, ergometry is hammered the size of hammer force or shaking table exciting force and the acceleration responsive of each measurement point into shape.This use-pattern can obtain whole kinetic parameters of moving mass free beam through the time-varying parameter identification algorithm, and this time-varying parameter identification algorithm must be known the excitation and the response data of system.Because the quality of known quality piece and mobile speed; Adopt the uniform cross section free beam of regular shape; Can set up the theoretical model of system thus, utilize the time-varying parameter of the theoretical model theory of computation again, and compare with the result of time-varying parameter identification algorithm.
2, self energisation mode:, directly measure the acceleration responsive of each measuring point only with the excitation of moving of mass as system.This use-pattern also can obtain the part kinetic parameter of moving mass free beam through the time-varying parameter identification algorithm, and this identification algorithm only need be known the response of system.
Two kinds of time-varying parameter identification algorithms that use-pattern is corresponding different can satisfy the function of checking algorithms of different.Select the rotating speed of the stepper motor of different gears can obtain slowly moving and fast moving of mass; Realize becoming slowly and the fast parameter time varying system that becomes, and in the mass motion process, increase or reduce the mass number, switch different shelves speed or change stepper motor and turn to the parameter time varying system that can realize transition.Can satisfy check to the time-varying parameter identification algorithm of multiple parameter change type.
Claims (2)
1. moving mass free beam dynamic characteristic test platform is characterized in that:
Two ends in dull and stereotyped (16) are provided with a support member (4) respectively, and the two ends of free beam (1) are installed in respectively on the support member (4) at two ends; Go up placement at free beam (1) and can go up the mass (2) that moves, the stacking quantity and can regulate of mass (2) at free beam (1); On the radial symmetry position of mass (2), be fixedly connected with two ends drag-line (17); The outside at the support member (4) at said two ends is respectively arranged with fixed pulley (3); Two ends drag-line (17) walk around respectively separately fixed pulley (3) at one end; Initiatively the transmission shaft (6) of reel (5) is to support (7) by axle to carry, driven by stepper motor (10); Synchronous pulley (8) drive simultaneously be in the other end by movable reel, make the active reel coiling drag-line of an end, the other end discharged drag-line by movable reel;
Moving direction in the bottom of free beam along mass evenly is provided with vibration acceleration sensor; Constitute detecting signal unit by vibration signals collecting conditioning module, single-chip microcomputer and vibration acceleration sensor, single-chip microcomputer obtains the detection signal of vibration acceleration sensor through the vibration signals collecting conditioning module; Stepper motor is accepted the control signal from single-chip microcomputer, and single-chip microcomputer receives the control signal from the Electric Machine Control button.
2. moving mass free beam dynamic characteristic test platform according to claim 1; It is characterized in that on free beam, guide groove be set along the length direction of free beam; In the bottom of mass the guiding projection is set, in guide groove, mass can be moved along guide groove with the intercalation of guiding projection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105085101A CN101968398B (en) | 2010-10-15 | 2010-10-15 | Dynamic property testing platform for movable mass simply-supported beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105085101A CN101968398B (en) | 2010-10-15 | 2010-10-15 | Dynamic property testing platform for movable mass simply-supported beam |
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| CN101968398A CN101968398A (en) | 2011-02-09 |
| CN101968398B true CN101968398B (en) | 2012-08-22 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226054B (en) * | 2013-04-26 | 2015-07-01 | 北京理工大学 | Experimental verification method for identifying modal parameter of variable mass structure |
| CN106448364B (en) * | 2016-11-29 | 2018-04-06 | 厉子宁 | A kind of simply supported beam vibration experiment demonstrator |
| CN108757820B (en) * | 2018-06-21 | 2020-04-03 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Self-adaptive vibration absorption control system and control method based on machine learning |
| CN108956070B (en) * | 2018-07-03 | 2020-01-31 | 武汉理工大学 | variable frequency damper vibration reduction test device based on magnetorheological elastomer and method thereof |
| CN113611195B (en) * | 2021-08-10 | 2023-05-02 | 合肥工业大学 | Dynamic vibration reduction experimental device and experimental method |
| CN114646444B (en) * | 2022-03-04 | 2023-09-26 | 上海机电工程研究所 | Variable mass vibration test device |
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| US6718270B2 (en) * | 2001-09-17 | 2004-04-06 | Hitachi, Ltd. | Vibration testing device and vibration response evaluating method |
| CN1587969A (en) * | 2004-09-30 | 2005-03-02 | 东华大学 | Measuring method and device for twisting property of flexible material |
| CN101221065A (en) * | 2007-12-16 | 2008-07-16 | 张蔚波 | Vibration teaching table capable of implementing non-contact exciting distance fine regulation and vibration active control |
| CN201329370Y (en) * | 2008-12-22 | 2009-10-21 | 二重集团（德阳）重型装备股份有限公司 | Tube milling machine cover moving device |
| CN101762368A (en) * | 2009-12-28 | 2010-06-30 | 嘉兴学院 | Elastomer dynamic response and vibration control test system under time varying load effect |
| CN201819785U (en) * | 2010-10-15 | 2011-05-04 | 合肥工业大学 | Experimental platform for moving mass simple beam dynamic characteristics |
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2010
- 2010-10-15 CN CN2010105085101A patent/CN101968398B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6718270B2 (en) * | 2001-09-17 | 2004-04-06 | Hitachi, Ltd. | Vibration testing device and vibration response evaluating method |
| CN1587969A (en) * | 2004-09-30 | 2005-03-02 | 东华大学 | Measuring method and device for twisting property of flexible material |
| CN101221065A (en) * | 2007-12-16 | 2008-07-16 | 张蔚波 | Vibration teaching table capable of implementing non-contact exciting distance fine regulation and vibration active control |
| CN201329370Y (en) * | 2008-12-22 | 2009-10-21 | 二重集团（德阳）重型装备股份有限公司 | Tube milling machine cover moving device |
| CN101762368A (en) * | 2009-12-28 | 2010-06-30 | 嘉兴学院 | Elastomer dynamic response and vibration control test system under time varying load effect |
| CN201819785U (en) * | 2010-10-15 | 2011-05-04 | 合肥工业大学 | Experimental platform for moving mass simple beam dynamic characteristics |
Non-Patent Citations (1)
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| 胡红生等.移动质量激励下梁动态响应分析与试验研究.《振动、测试与诊断》.2010,第30卷(第2期),153-157,299. * |
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