CN102410939B - Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure - Google Patents
Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure Download PDFInfo
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- CN102410939B CN102410939B CN201110401900.3A CN201110401900A CN102410939B CN 102410939 B CN102410939 B CN 102410939B CN 201110401900 A CN201110401900 A CN 201110401900A CN 102410939 B CN102410939 B CN 102410939B
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Abstract
The invention discloses a hydraulic pulse excitation device for experimental investigation on dynamic characteristics of a structure. The hydraulic pulse excitation device comprises a bottom plate, a pulse excitation component and a switch component, wherein the pulse excitation component comprises an impacting shaft, a sleeve, an excitation spring, an excitation hydraulic cylinder and a connector; the switch component comprises a switch hydraulic cylinder, a switch driving lever and a switch resetting mechanism; the excitation spring drives the impacting shaft to generate an impact force, and the switch resetting mechanism is used for locking and releasing the impacting shaft. In the hydraulic pulse excitation device, the hydraulic cylinder is used as an excitation driving mechanism, the hydraulic cylinder has a sealing function, so that the hydraulic pulse excitation device can respectively execute pulse excitation on the structure in air and under water, thereby realizing experiment and measurement of the dynamic characteristics of the structure in air and under water; by regulating the amount of compression of the excitation spring, the hydraulic pulse excitation device can accurately control the size of the excitation force used when pulse excitation is applied to the structure, and excellent repeatable accuracy is obtained in aspects of the origin of force of excitation and the excitation force direction.
Description
Technical field
The present invention relates to physical construction technique of dynamic measurement field, be specially a kind of hydraulic impulse exciting bank for Structure dynamic characteristics experimental study.
Background technology
Experimental study for Structure dynamic characteristics is mainly divided into two kinds: the one, under steady stimulation condition, measure the corresponding dynamic perfromance of structure; The 2nd, under transient excite condition, measure the corresponding dynamic perfromance of structure.Under transient excite condition, measure Structure dynamic characteristics, the normal method adopting is pulse excitation method at present.And the pulse excitation method normal open exertin hammer mode of knocking applies pulse excitation to structure.In experimental measurement, need to repeatedly knock at the same terms so that by average to reduce error, improve measuring accuracy.Therefore,, when knocking, the position of center of effort, the size of power and action direction all need there is good repeatable accuracy.Obviously no matter, with holding power hammer, knock, be the position of center of effort, or the size and Orientation of hammer force, is all difficult to the repeatable accuracy that reaches higher.When structure is larger, employing power hammer knocks may the abundant mode of excitation structure, therefore causes measurement result mistake.
The at present experimental study for Structure dynamic characteristics mainly concentrates in air ambient, along with the deep exploitation of ocean, for structure under water the experimental study of the dynamic perfromance in environment need to further carry out and go deep into.Due to the vibrator that does not also have at present to work under water, so for the measurement of submerged structure dynamic perfromance, cannot adopt and need to apply to structure the measuring method of steady stimulation.For the test of submerged structure dynamic perfromance, the normal disposal route adopting is that structure division is surfaced at present, in structure, surfaces and partly structure is applied to excitation.Because structure is completely not under water, test result can produce larger error; And, when needs are studied under deep water conditions Structure dynamic characteristics, just cannot adopt this disposal route.
Summary of the invention
The technical matters solving
Technical matters to be solved by this invention is: existing while measuring Structure dynamic characteristics by pulse excitation method, when employing power hammer knocks structure, the action direction repeatable accuracy of the size of center of effort position, power and power is low, and when structure is larger, employing power hammer knocks may the abundant mode of excitation structure, therefore causes measurement result mistake; In addition, there is no at present submerged structure dynamic perfromance is carried out to the accurately device of test.The problem existing for solving prior art, the present invention proposes a kind of hydraulic impulse exciting bank for Structure dynamic characteristics experimental study.
Technical scheme
Technical scheme of the present invention is:
Described a kind of hydraulic impulse exciting bank for Structure dynamic characteristics experimental study, is characterized in that: comprise base plate, pulse excitation assembly and switch module;
Pulse excitation assembly comprises impact groove, sleeve, excitation spring, excitation hydraulic cylinder and web member; Excitation spring is coaxially placed in sleeve; Impact groove middle part has annular protrusion, impact groove to stretch into sleeve one end, and impact groove middle part is fixedly connected with excitation spring one end; The piston rod of excitation hydraulic cylinder stretches into the other end of sleeve, and the piston rod end of excitation hydraulic cylinder is fixedly connected with the excitation spring other end by web member; The central axis conllinear of impact groove, sleeve, excitation spring and excitation hydraulic cylinder piston rod; The drop bar position of impact groove is fixed by impact groove bearing and base plate, and between impact groove bearing and drop bar, orienting sleeve is installed; Sleeve is fixed by sleeve bearing and base plate; Excitation hydraulic cylinder is fixed by hydraulic cylinder bearing and base plate;
Switch module comprises switch hydraulic cylinder, switch shift lever and switch resetting-mechanism; Switch resetting-mechanism comprises switch pin, back-moving spring and switch end cap; Switch hydraulic cylinder is fixed by sleeve bearing and base plate; The piston rod of switch hydraulic cylinder is fixedly connected with switch shift lever end; Switch shift lever coordinates with switch pin inclined-plane, and back-moving spring is enclosed within on switch pin, and back-moving spring is subject to the projection constraint of switch end cap and switch pin middle part and in compressive state; Switch pin end coordinates with impact groove middle part annular protrusion, realizes the lock of impact groove is put to control.
Beneficial effect
The present invention adopts hydraulic cylinder as excitation driving mechanism, itself has sealing function hydraulic cylinder, so the present invention can apply pulse excitation to structure under water in air neutralization respectively, can realize at air and neutralize the experimental measurement to Structure dynamic characteristics under water, the maximum water depth of use is greater than 1000m; The present invention encourages the decrement of spring by adjusting, can accurately control exciting force size when structure is applied to pulse excitation, and encourage center of effort and exciting force direction to have good repeatable accuracy.
Accompanying drawing explanation
Fig. 1: structural representation of the present invention;
Fig. 2: in air,, after exciting, the structural loss factor of certain light plate structure measuring is with the change curve of frequency;
Fig. 3: after exciting, the structural loss factor of certain light plate structure measuring is with the change curve of frequency under water;
Wherein: 1. base plate, 2. impact groove, 3. impact groove bearing, 4. orienting sleeve; 5. switch bearing, 6. sleeve, 7. sleeve bearing; 8. encourage spring, 9. web member, 10. excitation hydraulic cylinder piston rod protective sleeve; 11. hydraulic cylinder bearings, 12. excitation hydraulic cylinders, 13. switch hydraulic cylinder piston rod protective sleeves; 14. switch hydraulic cylinders, 15. switch hydraulic cylinder piston rod orienting sleeves, 16. back-moving springs; 17. switch pins, 18. switch end caps, 19. switch shift levers.
Embodiment
Below in conjunction with specific embodiment, the present invention is described:
In the present embodiment, adopt the hydraulic impulse exciting bank focalization plate that the present invention proposes to carry out the exciter test in air ambient and underwater environment, measured tabula rasa under varying environment the structural loss factor with the variation of frequency.
With reference to accompanying drawing 1, the hydraulic impulse exciting bank in the present embodiment comprises base plate 1, pulse excitation assembly and switch module.
Pulse excitation assembly comprises impact groove 2, sleeve 6, excitation spring 8, excitation hydraulic cylinder 12 and web member 9.Excitation spring 8 is coaxially placed in sleeve 6; There is annular protrusion at impact groove 2 middle parts, and impact groove stretches into the inside, one end of sleeve 6, and impact groove middle part is fixedly connected with by pin with excitation spring 8 one end; It is inner that one side piston rod of excitation hydraulic cylinder 12 stretches into the other end of sleeve 6, and this side piston rod end is fixedly connected with web member 9 screw threads, and web member is fixedly connected with by pin with encouraging the spring other end; The central axis conllinear of impact groove, sleeve, excitation spring and excitation hydraulic cylinder piston rod; The drop bar position of impact groove is fixing with base plate 1 by impact groove bearing 3, and orienting sleeve 4 is installed between impact groove bearing and drop bar; Sleeve is fixed by two sleeve bearings 7 and base plate; Excitation hydraulic cylinder is fixed by two hydraulic cylinder bearings 12 and base plate; Opposite side upper cover of piston rod at excitation hydraulic cylinder 12 has excitation hydraulic cylinder piston rod protective sleeve 10.
Switch module comprises switch hydraulic cylinder 14, switch shift lever 19 and switch resetting-mechanism; Switch resetting-mechanism comprises switch pin 17, back-moving spring 16 and switch end cap 18; Switch hydraulic cylinder is also fixedly connected with sleeve bearing, thereby is fixed on base plate by sleeve bearing; One side piston rod of switch hydraulic cylinder is fixedly connected with switch shift lever end thread; Switch shift lever coordinates by inclined-plane with switch pin, and back-moving spring is enclosed within on switch pin, and back-moving spring is subject to the projection constraint of switch end cap and switch pin middle part and in compressive state; The rectilinear motion of switch hydraulic cylinder piston rod coordinates the rectilinear motion that is converted into switch pin by inclined-plane, realize opening of switch pin, and back-moving spring is realized the reset of switch pin; Switch pin end coordinates with impact groove middle part annular protrusion, realizes the lock of impact groove is put to control.The side upper cover of piston rod being connected with switch shift lever at switch hydraulic cylinder has switch hydraulic cylinder piston rod orienting sleeve 15; opposite side upper cover of piston rod at switch hydraulic cylinder has switch hydraulic cylinder piston rod protective sleeve 13, and switch resetting-mechanism is fixed by switch bearing 5 and base plate.
In the present invention, encourage hydraulic cylinder and switch hydraulic cylinder itself to there is sealing function, other parts are without sealing, package unit can use under water, excitation hydraulic cylinder and switch hydraulic cylinder are realized the accurate motion control of both piston rods by hydraulic pump, the linear reciprocating motion of excitation hydraulic cylinder piston rod is realized the excitation compression of spring and the transmitting of reset and impact groove and two processes that reset, by hydraulic pump control, encourage the stroke of hydraulic cylinder piston rod, can accurately control the decrement of excitation spring, thereby accurately control the impulsive force of impact groove.
The process of finishing the work of the present embodiment is:
Hydraulic impulse exciting bank is in original state, and switch pin coordinates with impact groove middle part annular protrusion, makes impact groove in closure state; Hydraulic pump control excitation hydraulic cylinder piston rod rectilinear motion compression excitation spring, and control as required the size of decrement, when excitation amount of spring compression reaches predetermined decrement, excitation hydraulic cylinder quits work; Switch hydraulic cylinder piston rod drives switch shift lever rectilinear motion, and the inclined-plane mating reaction by switch shift lever and switch pin, makes switch pin rectilinear motion, switch pin and impact groove middle part annular protrusion depart from, impact groove transmitting, switch hydraulic cylinder quits work, thereby completes the pulse excitation to structure.
During reset, excitation hydraulic cylinder piston rod rectilinear motion, drive excitation spring and impact groove rectilinear motion, after excitation spring and impact groove reset, excitation hydraulic cylinder quits work, switch hydraulic cylinder piston rod drives switch shift lever rectilinear motion, switch pin resets under the effect of back-moving spring, and switch pin coordinates with impact groove middle part annular protrusion, and impact groove is locked, switch hydraulic cylinder quits work, and hydraulic impulse exciting bank is got back to original state.
Fig. 2 is in air ambient, uses exciting of the present invention, and the light plate structure dissipation factor measuring is with the change curve of frequency, and Fig. 3, in environment under water, uses exciting of the present invention, and the light plate structure structural loss factor measuring is with the change curve of frequency.From Fig. 2 and Fig. 3, can find out, the dissipation factor of submerged structure within the scope of whole test frequency, be all greater than air in the dissipation factor of structure, this meets theoretical analysis and actual conditions.Therefore the experimental study that, the present invention is Structure dynamic characteristics provides desirable pulse excitation device.
Claims (1)
1. for a hydraulic impulse exciting bank for Structure dynamic characteristics experimental study, it is characterized in that: comprise base plate, pulse excitation assembly and switch module;
Pulse excitation assembly comprises impact groove, sleeve, excitation spring, excitation hydraulic cylinder and web member; Excitation spring is coaxially placed in sleeve; Impact groove middle part has annular protrusion, impact groove to stretch into sleeve one end, and impact groove middle part is fixedly connected with excitation spring one end; The piston rod of excitation hydraulic cylinder stretches into the other end of sleeve, and the piston rod end of excitation hydraulic cylinder is fixedly connected with the excitation spring other end by web member; The central axis conllinear of impact groove, sleeve, excitation spring and excitation hydraulic cylinder piston rod; The drop bar position of impact groove is fixed by impact groove bearing and base plate, and between impact groove bearing and drop bar, orienting sleeve is installed; Sleeve is fixed by sleeve bearing and base plate; Excitation hydraulic cylinder is fixed by hydraulic cylinder bearing and base plate; Opposite side upper cover of piston rod at excitation hydraulic cylinder has excitation hydraulic cylinder piston rod protective sleeve; Excitation hydraulic cylinder encourages the stroke of hydraulic cylinder piston rod by hydraulic pump control;
Switch module comprises switch hydraulic cylinder, switch shift lever and switch resetting-mechanism; Switch resetting-mechanism comprises switch pin, back-moving spring and switch end cap; Switch hydraulic cylinder is fixed by sleeve bearing and base plate; The piston rod of switch hydraulic cylinder is fixedly connected with switch shift lever end; Switch shift lever coordinates with switch pin inclined-plane, and back-moving spring is enclosed within on switch pin, and back-moving spring is subject to the projection constraint of switch end cap and switch pin middle part and in compressive state; Switch pin end coordinates with impact groove middle part annular protrusion, realizes the lock of impact groove is put to control; The side upper cover of piston rod being connected with switch shift lever at switch hydraulic cylinder has switch hydraulic cylinder piston rod orienting sleeve, at the opposite side upper cover of piston rod of switch hydraulic cylinder, has switch hydraulic cylinder piston rod protective sleeve;
Described excitation hydraulic cylinder and switch hydraulic cylinder have sealing function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110401900.3A CN102410939B (en) | 2011-12-06 | 2011-12-06 | Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110401900.3A CN102410939B (en) | 2011-12-06 | 2011-12-06 | Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure |
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| CN102410939A CN102410939A (en) | 2012-04-11 |
| CN102410939B true CN102410939B (en) | 2014-02-26 |
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| CN201110401900.3A Expired - Fee Related CN102410939B (en) | 2011-12-06 | 2011-12-06 | Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103427766B (en) * | 2013-08-07 | 2015-12-02 | 浙江大学 | A kind of deep water steady state force exciting device and output excitation method thereof |
| BR112020012800A2 (en) * | 2017-12-30 | 2020-11-24 | Perimetrics, Llc | device for determining the structural characteristics of an object and system for measuring the structural characteristics of an object |
Citations (7)
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|---|---|---|---|---|
| US4594521A (en) * | 1984-11-15 | 1986-06-10 | Schlicher Rex L | Repeatable explosive-driven pulse generator system and method |
| CN2685528Y (en) * | 2004-03-09 | 2005-03-16 | 中国石化集团胜利石油管理局钻井工艺研究院 | Underground high pressure hydraulic pulse generator |
| CN2914055Y (en) * | 2006-03-24 | 2007-06-20 | 唐升棣 | Arm oscillating structure of gas dynamic type drop testing machine |
| CN101024217A (en) * | 2007-03-30 | 2007-08-29 | 湖南科技大学 | Two-bar impaction-regulatable vibration excitor |
| CN101315262A (en) * | 2008-06-03 | 2008-12-03 | 北京航空航天大学 | Movement objective generating device |
| CN101537577A (en) * | 2009-04-24 | 2009-09-23 | 中国地质大学（武汉） | Electric-control liquid strike and excitation method and device for vibration cutting |
| CN202351069U (en) * | 2011-12-06 | 2012-07-25 | 西北工业大学 | Hydraulic impulse excitation device for experimental research on structure dynamic properties |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1803754C (en) * | 1991-01-21 | 1993-03-23 | Краматорский Индустриальный Институт | Test for impact tests |
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2011
- 2011-12-06 CN CN201110401900.3A patent/CN102410939B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4594521A (en) * | 1984-11-15 | 1986-06-10 | Schlicher Rex L | Repeatable explosive-driven pulse generator system and method |
| CN2685528Y (en) * | 2004-03-09 | 2005-03-16 | 中国石化集团胜利石油管理局钻井工艺研究院 | Underground high pressure hydraulic pulse generator |
| CN2914055Y (en) * | 2006-03-24 | 2007-06-20 | 唐升棣 | Arm oscillating structure of gas dynamic type drop testing machine |
| CN101024217A (en) * | 2007-03-30 | 2007-08-29 | 湖南科技大学 | Two-bar impaction-regulatable vibration excitor |
| CN101315262A (en) * | 2008-06-03 | 2008-12-03 | 北京航空航天大学 | Movement objective generating device |
| CN101537577A (en) * | 2009-04-24 | 2009-09-23 | 中国地质大学（武汉） | Electric-control liquid strike and excitation method and device for vibration cutting |
| CN202351069U (en) * | 2011-12-06 | 2012-07-25 | 西北工业大学 | Hydraulic impulse excitation device for experimental research on structure dynamic properties |
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