CN204440759U - Suspension cable Parametric excitation demonstrating experiment device - Google Patents
Suspension cable Parametric excitation demonstrating experiment device Download PDFInfo
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- CN204440759U CN204440759U CN201520115430.8U CN201520115430U CN204440759U CN 204440759 U CN204440759 U CN 204440759U CN 201520115430 U CN201520115430 U CN 201520115430U CN 204440759 U CN204440759 U CN 204440759U
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- suspension cable
- crossbeam
- base frame
- acceleration transducer
- parametric excitation
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Abstract
The open suspension cable Parametric excitation demonstrating experiment device of the utility model, comprise base frame, fixing support rack, force cell and vibrator, fixing support rack comprises crossbeam, column, spar, reinforced liner, A-frame and fixed pulley, crossbeam, column are vertically fixedly connected with mutually with spar, reinforced liner is fixed on the junction of column and crossbeam and spar, A-frame is fixed on the bottom of column, and fixed pulley is fixed on the top of column; Crossbeam and spar are fixed on base frame, and beam top stretches out base frame, and equally spacedly on the crossbeam stretching out base frame are provided with through hole; Force cell is fixed on the A-frame of fixing support rack; Suspension cable is through fixed pulley, and its one end is connected with the measuring device of force cell, and the other end is connected with dop through crossbeam through hole; Vibrator is arranged on base frame, and its be positioned at stretch out base frame crossbeam below.The utility model, by machinery and power system, by theoretical for Parametric excitation ocular demonstration out, gives perceptual knowledge.
Description
Technical field
The utility model belongs to teaching and scientific research demonstration and experimental apparatus, relates to nonlinear vibration mechanics Parametric excitation phenomenon demonstration instrument device and experimental apparatus, particularly relates to a kind of suspension cable Parametric excitation demonstrator and experimental provision.
Background technology
Parametric excitation is also called that parametric vibration (parametrically excited vibration) is another vibration mode except free vibration, forced vibration and autovibration.Parametric vibration is produced by the excitation in the external world, but excitation is not put on system with external force form, but is indirectly realized by the periodically-varied of parameter quality intrinsic in vibrational system, rigidity, damping.The kinetics equation of system is caused to be nonlinear equation like this.Therefore, Parametric excitation is the same with autovibration also belongs to nonlinear vibration.The difference of essence is had, for the perceptual knowledge of most of engineering technical personnel and young student rarely nonlinear vibration compared with theoretical about the theory of nonlinear oscillation and linear oscillator.In the work of reality, the proximate nutrition of suspension cable Parametric excitation phenomenon is abstract, beyonds one's depth, and makes people often cause concept obfuscation unclear.Only stop some research methods of association during current Students ' Learning nonlinear vibration course, can supply practising method without any experimental provision, be unfavorable for teaching and the carrying out of scientific research.Current not yet have instruments used for education that are suitable, suspension cable Parametric excitation phenomenon demonstration intuitively, affects quality of instruction, procrastinate research practice.In order to the needs of satisfied teaching, scientific research, development suspension cable Parametric excitation demonstrator is necessary.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of suspension cable Parametric excitation demonstrating experiment device.Suspension cable Parametric excitation phenomenon simple machinery and power system are demonstrated out, overcome suspension cable Parametric excitation phenomenon more abstract, beyond one's depth, often make people cause the problems such as concept obfuscation, to people's perceptual knowledge intuitively, be convenient to, to the understanding of suspension cable Parametric excitation concept, be beneficial to teaching and scientific research.
The utility model solves its technical matters and is achieved through the following technical solutions:
Suspension cable Parametric excitation demonstrating experiment device, comprises base frame, suspension cable, fixing support rack, force cell and vibrator, wherein:
Described fixing support rack comprises crossbeam, column, spar, A-frame and fixed pulley, crossbeam and spar are fixed on base frame and both are mutually vertical in base frame surface level, be stably fixed on base frame to make described fixing support rack, when Inclined Cable Vibration, whole fixing support rack is stabilized on base frame, and does not depart from base frame; Base frame is stretched out on the top of crossbeam, and equally spacedly on the crossbeam stretching out base frame is provided with through hole, circular through hole; Described column is arranged on the vertical intersection of crossbeam and spar, and with base frame horizontal plane, preferred reinforced liner is arranged on the junction of column, crossbeam and spar, and A-frame is arranged on the middle and lower part of column, and fixed pulley is arranged on the middle and upper part of column;
Described force cell is fixedly installed on the A-frame of fixing support rack; One end of suspension cable is connected with the measuring device of force cell through after fixed pulley, and the other end of suspension cable is through after the through hole of crossbeam, and be connected with dop, described dop contacts with crossbeam, tightens to make whole piece suspension cable; Vibrator is arranged on base frame, and it is positioned at the below of the crossbeam stretching out base frame, and vibrator motion end contacts with crossbeam;
Described suspension cable arranges the first acceleration transducer, and described first acceleration transducer is connected with signal analysis instrument, to test the in plane vibration of drag-line; Along through hole on fixed pulley direction, described first acceleration transducer be arranged on suspension cable length 1/1 to four/3rd between position, the preferably position of 1/4th.
In technique scheme, the signal output interface of described force cell is connected with dynamometer, is measured the pulling force of suspension cable by dynamometer.
In technique scheme, described fixed pulley adopts V-arrangement fixed pulley, can prevent the rigid motion that the sideslip of suspension cable causes.
In technique scheme, described crossbeam stretches out base frame side 300-400 millimeter, facilitates the layout of Position of Vibrating; The described manhole diameter stretched out on the crossbeam of base frame is 4-6mm; The quantity of the described manhole stretched out on the crossbeam of base frame is 5-8, passes different manholes and coordinates dop to be clamped, can adjust gradient and the length of suspension cable, thus change the natural frequency of suspension cable by suspension cable.
In technique scheme, described vibrator is Electrodynamic Vibrators, vibrator be positioned at stretch out base frame crossbeam below, Electrodynamic Vibrators motion end operationally can move up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, make crossbeam external part do deflection of beam vibration, vibrator motion end is positioned at the outside of the through hole that suspension cable passes, and both horizontal ranges are 30-50 millimeters.
In technique scheme, one end of described suspension cable and the measuring device of force cell adopt nuts and washers to be fixed to be connected, nut is carved out a groove close to annular makes suspension cable pass through, and then relies on the threading force of nut and packing ring to clamp suspension cable.
In technique scheme, described dop is arranged on the lower surface of the crossbeam 2 stretching out base frame, dop is for clamping suspension cable, the pulling force of suspension cable is relied on to be close together between dop and the lower surface of crossbeam, increase the tensile force of suspension cable like this by adding pad between dop and the lower surface of crossbeam, thus change the natural frequency of suspension cable.
In technique scheme, described first acceleration transducer is bonded on suspension cable by aluminium flake, is namely first bonded on suspension cable by lightweight aluminium flake, then is bonded on aluminium flake by the first acceleration transducer.
In technique scheme, the second acceleration transducer (not marking in figure) is provided with in the through hole that suspension cable passes, second acceleration transducer is connected with signal analysis instrument, to test the vibration of suspension cable end points (i.e. suspension cable pass manhole place).
The utility model using method is as follows:
(1) the utility model demonstration Parametric excitation phenomenon is used: be bonded on suspension cable by aluminium flake by the first acceleration transducer and (be namely first bonded on suspension cable by lightweight aluminium flake, then be bonded on aluminium flake by the first acceleration transducer); Second acceleration transducer is bonded in the manhole place that suspension cable passes, and the first acceleration transducer is connected with signal analysis instrument with the second acceleration transducer.Open Electrodynamic Vibrators, the motion end of Electrodynamic Vibrators moves up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, makes crossbeam external part do deflection of beam vibration.The in plane vibration of the first acceleration transducer test suspension cable; The vibration of the second acceleration transducer test suspension cable end points (i.e. suspension cable pass manhole place).By changing the excited frequency of electric activator and the size of exciting force, two terrace internal vibrations of suspension cable can be reappeared, and the change of suspension cable dynamic respond under drawing different vibration frequency, vibration amplitude incentive condition.
(2) relation of the utility model demonstration suspension cable tensile force, suspension cable gradient and suspension cable natural frequency is used: be bonded on suspension cable by aluminium flake by the first acceleration transducer and (be namely first bonded on suspension cable by lightweight aluminium flake, then be bonded on aluminium flake by the first acceleration transducer); Second acceleration transducer is bonded in the manhole place that suspension cable passes, and the first acceleration transducer is connected with signal analysis instrument with the second acceleration transducer.The signal output interface of force cell is connected with dynamometer.Increase the tensile force of suspension cable by adding pad between dop and the lower surface of crossbeam, thus change the natural frequency of suspension cable; The position passing manhole by changing suspension cable changes gradient and the length of suspension cable, thus changes the natural frequency of suspension cable.Open Electrodynamic Vibrators, the motion end of Electrodynamic Vibrators moves up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, makes crossbeam external part do deflection of beam vibration.The natural frequency value of suspension cable under different gradient (namely suspension cable is through different through hole) and different tensile force situation can be recorded by the first acceleration transducer and the second acceleration transducer.
Abstract Parametric excitation theory, by simple physical construction and simple power system, is demonstrated out by the present invention intuitively, overcomes that Parametric excitation Theory comparison is abstract, concept is beyonded one's depth, make people cause the problem of concept obfuscation.Because Parametric excitation demonstrator gives perceptual knowledge intuitively, strengthen the understanding to Parametric excitation concept, be conducive to teaching and scientific research, filled up the blank of these instruments used for education, not only had an economic benefit but also have social benefit.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is the structural representation of fixing support rack in the utility model and force cell;
Fig. 3 is that the local at V place in Fig. 2 sends out figure large;
Fig. 4 is the vertical view of the header portion stretching out base frame in the utility model.
Wherein 1 is vibrator, and 1-1 is vibrator motion end, and 2 is crossbeam, 2-1 is through hole, and 3 is suspension cable, and 4 is fixed pulley, 5 is column, and 6 is force cell, and 6-1 is signal output interface, 6-2 is measuring device, and 7 is A-frame, and 8 is reinforced liner, 9 is spar, 10 is base frame, and 11 is dop, and 12 is the first acceleration transducer.
Embodiment
The technical solution of the utility model is further illustrated below in conjunction with specific embodiment.
See accompanying drawing 1-4, suspension cable Parametric excitation demonstrating experiment device of the present utility model, comprises base frame, suspension cable, fixing support rack, force cell and vibrator, wherein:
Described fixing support rack comprises crossbeam, column, spar, A-frame and fixed pulley, crossbeam and spar are fixed on base frame and both are mutually vertical in base frame surface level, be stably fixed on base frame to make described fixing support rack, when Inclined Cable Vibration, whole fixing support rack is stabilized on base frame, and does not depart from base frame; Base frame is stretched out on the top of crossbeam, and equally spacedly on the crossbeam stretching out base frame is provided with through hole, circular through hole; Described column is arranged on the vertical intersection of crossbeam and spar, and with base frame horizontal plane, preferred reinforced liner is arranged on the junction of column, crossbeam and spar, and A-frame is arranged on the middle and lower part of column, and fixed pulley is arranged on the middle and upper part of column;
Described force cell is fixedly installed on the A-frame of fixing support rack; One end of suspension cable is connected with the measuring device of force cell through after fixed pulley, and the other end of suspension cable is through after the through hole of crossbeam, and be connected with dop, described dop contacts with crossbeam, tightens to make whole piece suspension cable; Vibrator is arranged on base frame, and it is positioned at the below of the crossbeam stretching out base frame, and vibrator motion end contacts with crossbeam;
Described suspension cable arranges the first acceleration transducer, and described first acceleration transducer is connected with signal analysis instrument, to test the in plane vibration of drag-line; Along through hole on fixed pulley direction, described first acceleration transducer be arranged on suspension cable length 1/1 to four/3rd between position, the preferably position of 1/4th.
In technique scheme, the signal output interface of described force cell is connected with dynamometer, is measured the pulling force of suspension cable by dynamometer.
In technique scheme, described fixed pulley adopts V-arrangement fixed pulley, can prevent the rigid motion that the sideslip of suspension cable causes.
In technique scheme, described crossbeam stretches out base frame side 300-400 millimeter, facilitates the layout of Position of Vibrating; The described manhole diameter stretched out on the crossbeam of base frame is 4-6mm; The quantity of the described manhole stretched out on the crossbeam of base frame is 5-8, passes different manholes and coordinates dop to be clamped, can adjust gradient and the length of suspension cable, thus change the natural frequency of suspension cable by suspension cable.
In technique scheme, described vibrator is Electrodynamic Vibrators, vibrator be positioned at stretch out base frame crossbeam below, Electrodynamic Vibrators motion end operationally can move up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, make crossbeam external part do deflection of beam vibration, vibrator motion end is positioned at the outside of the through hole that suspension cable passes, and both horizontal ranges are 30-50 millimeters.
In technique scheme, one end of described suspension cable and the measuring device of force cell adopt nuts and washers to be fixed to be connected, nut is carved out a groove close to annular makes suspension cable pass through, and then relies on the threading force of nut and packing ring to clamp suspension cable.
In technique scheme, described dop is arranged on the lower surface of the crossbeam 2 stretching out base frame, dop is for clamping suspension cable, the pulling force of suspension cable is relied on to be close together between dop and the lower surface of crossbeam, increase the tensile force of suspension cable like this by adding pad between dop and the lower surface of crossbeam, thus change the natural frequency of suspension cable.
In technique scheme, described first acceleration transducer is bonded on suspension cable by aluminium flake, is namely first bonded on suspension cable by lightweight aluminium flake, then is bonded on aluminium flake by the first acceleration transducer.
In technique scheme, the second acceleration transducer (not marking in figure) is provided with in the through hole that suspension cable passes, second acceleration transducer is connected with signal analysis instrument, to test the vibration of suspension cable end points (i.e. suspension cable pass manhole place).
The utility model using method is as follows:
(1) this instrument is used to demonstrate Parametric excitation phenomenon: to be bonded on suspension cable by aluminium flake by the first acceleration transducer and (to be namely first bonded on suspension cable by lightweight aluminium flake, then to be bonded on aluminium flake by the first acceleration transducer); Second acceleration transducer is bonded in the manhole place that suspension cable passes, and the first acceleration transducer is connected with signal analysis instrument with the second acceleration transducer.Open Electrodynamic Vibrators, the motion end of Electrodynamic Vibrators moves up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, makes crossbeam external part do deflection of beam vibration.The in plane vibration of the first acceleration transducer test suspension cable; The vibration of the second acceleration transducer test suspension cable end points (i.e. suspension cable pass manhole place).By changing the excited frequency of electric activator and the size of exciting force, two terrace internal vibrations of suspension cable can be reappeared, and the change of suspension cable dynamic respond under drawing different vibration frequency, vibration amplitude incentive condition.
(2) this instrument is used to demonstrate the relation of suspension cable tensile force, suspension cable geometric parameter and suspension cable natural frequency: to be bonded on suspension cable by aluminium flake by the first acceleration transducer and (to be namely first bonded on suspension cable by lightweight aluminium flake, then to be bonded on aluminium flake by the first acceleration transducer); Second acceleration transducer is bonded in the manhole place that suspension cable passes, and the first acceleration transducer is connected with signal analysis instrument with the second acceleration transducer.The signal output interface of force cell is connected with dynamometer.Increase the tensile force of suspension cable by adding pad between dop and the lower surface of crossbeam, thus change the natural frequency of suspension cable; The position passing manhole by changing suspension cable changes gradient and the length of suspension cable, thus changes the natural frequency of suspension cable.Open Electrodynamic Vibrators, the motion end of Electrodynamic Vibrators moves up and down and the bottom surface of exciting crossbeam, by the excitation to crossbeam bottom surface, makes crossbeam external part do deflection of beam vibration.The natural frequency value of suspension cable under different length (namely suspension cable is through different through hole) and different tensile force situation can be recorded by the first acceleration transducer and the second acceleration transducer.
In technique scheme, described suspension cable arranges the 3rd acceleration transducer, described 3rd acceleration transducer is connected with signal analysis instrument, to test the in plane vibration of drag-line; Along through hole on fixed pulley direction, described 3rd acceleration transducer be arranged on suspension cable length 3/2 to four/3rds between position, preferably in the position of 3/4ths, the mode of the first acceleration transducer is adopted the 3rd acceleration transducer and suspension cable to be arranged; So, when testing, the relevant vibration signal of suspension cable is namely gathered by first and the 3 two acceleration transducer.
Above exemplary description is done to the utility model; should be noted that; when not departing from core of the present utility model, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection domain of the present utility model.
Claims (10)
1. suspension cable Parametric excitation demonstrating experiment device, it is characterized in that, comprise base frame, suspension cable, fixing support rack, force cell and vibrator, wherein: described fixing support rack comprises crossbeam, column, spar, A-frame and fixed pulley, crossbeam and spar to be fixed on base frame and both are mutually vertical in base frame surface level; Base frame is stretched out on the top of crossbeam, and equally spacedly on the crossbeam stretching out base frame is provided with through hole; Described column is arranged on the vertical intersection of crossbeam and spar, and with base frame horizontal plane, A-frame is arranged on the middle and lower part of column, and fixed pulley is arranged on the middle and upper part of column;
Described force cell is fixedly installed on the A-frame of fixing support rack; One end of suspension cable is connected with the measuring device of force cell through after fixed pulley, and the signal output interface of force cell is connected with dynamometer; The other end of suspension cable is through after the through hole of crossbeam, and be connected with dop, described dop contacts with crossbeam; Vibrator is arranged on base frame, and it is positioned at the below of the crossbeam stretching out base frame, and vibrator motion end contacts with crossbeam;
Described suspension cable arranges the first acceleration transducer, and described first acceleration transducer is connected with signal analysis instrument; Along through hole on fixed pulley direction, described first acceleration transducer be arranged on suspension cable length 1/1 to four/3rd between position.
2. suspension cable Parametric excitation demonstrating experiment device according to claim 1, is characterized in that, the through hole that suspension cable passes is provided with the second acceleration transducer, and the second acceleration transducer is connected with signal analysis instrument.
3. the suspension cable Parametric excitation demonstrating experiment device according to claims 1 or 2, is characterized in that, described suspension cable arranges the 3rd acceleration transducer, and described 3rd acceleration transducer is connected with signal analysis instrument; Along through hole on fixed pulley direction, described 3rd acceleration transducer be arranged on suspension cable length 3/2 to four/3rds between position.
4. suspension cable Parametric excitation demonstrating experiment device according to claim 3, is characterized in that, along through hole on fixed pulley direction, described first acceleration transducer is arranged on the position of suspension cable length 1/4th; Described 3rd acceleration transducer is arranged on the position of suspension cable length 3/4ths.
5. suspension cable Parametric excitation demonstrating experiment device according to claim 1, is characterized in that, arrange reinforced liner in the junction of column, crossbeam and spar.
6. suspension cable Parametric excitation demonstrating experiment device according to claim 1, is characterized in that, on the crossbeam stretching out base frame, the through hole of spaced set is manhole.
7. suspension cable Parametric excitation demonstrating experiment device according to claim 1, is characterized in that, described fixed pulley adopts V-arrangement fixed pulley.
8. suspension cable Parametric excitation demonstrating experiment device according to claim 6, is characterized in that, described crossbeam stretches out base frame side 300-400 millimeter, described in the manhole diameter stretched out on the crossbeam of base frame be 4-6mm; The quantity of the described manhole stretched out on the crossbeam of base frame is 5-8.
9. suspension cable Parametric excitation demonstrating experiment device according to claim 1, it is characterized in that, described vibrator is Electrodynamic Vibrators, vibrator be positioned at stretch out base frame crossbeam below, vibrator motion end is positioned at the outside of the through hole that suspension cable passes, and both horizontal ranges are 30-50 millimeters.
10. suspension cable Parametric excitation demonstrating experiment device according to claim 1, it is characterized in that, described dop is arranged on the lower surface of the crossbeam stretching out base frame, between dop and the lower surface of crossbeam, add pad.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520115430.8U CN204440759U (en) | 2015-02-25 | 2015-02-25 | Suspension cable Parametric excitation demonstrating experiment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520115430.8U CN204440759U (en) | 2015-02-25 | 2015-02-25 | Suspension cable Parametric excitation demonstrating experiment device |
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| CN204440759U true CN204440759U (en) | 2015-07-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658383A (en) * | 2015-02-25 | 2015-05-27 | 天津大学 | Stay cable parametrically excited vibration demonstrative experiment device and use method thereof |
| CN114353861A (en) * | 2021-12-02 | 2022-04-15 | 中国矿业大学 | Comprehensive detection device and method for states of suspension cable and cable clamp of suspension bridge |
| CN114858382A (en) * | 2022-04-26 | 2022-08-05 | 西南交通大学 | Cable-stayed bridge modal transition test testing device and modal transition analysis method |
-
2015
- 2015-02-25 CN CN201520115430.8U patent/CN204440759U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658383A (en) * | 2015-02-25 | 2015-05-27 | 天津大学 | Stay cable parametrically excited vibration demonstrative experiment device and use method thereof |
| CN104658383B (en) * | 2015-02-25 | 2018-04-27 | 天津大学 | Suspension cable Parametric excitation demonstrating experiment device and its application method |
| CN114353861A (en) * | 2021-12-02 | 2022-04-15 | 中国矿业大学 | Comprehensive detection device and method for states of suspension cable and cable clamp of suspension bridge |
| CN114858382A (en) * | 2022-04-26 | 2022-08-05 | 西南交通大学 | Cable-stayed bridge modal transition test testing device and modal transition analysis method |
| CN114858382B (en) * | 2022-04-26 | 2023-02-03 | 西南交通大学 | Cable-stayed bridge modal transition test testing device and modal transition analysis method |
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Granted publication date: 20150701 Termination date: 20180225 |
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