CN202041335U - Large-load wide-band power flow testing device - Google Patents
Large-load wide-band power flow testing device Download PDFInfo
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- CN202041335U CN202041335U CN2011200597885U CN201120059788U CN202041335U CN 202041335 U CN202041335 U CN 202041335U CN 2011200597885 U CN2011200597885 U CN 2011200597885U CN 201120059788 U CN201120059788 U CN 201120059788U CN 202041335 U CN202041335 U CN 202041335U
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- layer plate
- power circuit
- acceleration
- transducer
- top plate
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Abstract
The utility model provides a large-load wide-band power flow testing device, which comprises an upper-layer plate, a middle-layer plate and a lower-layer plate; an acceleration transducer is solidified in an installation groove in the middle of the upper-layer plate and bears no pressure; the upper surface and the lower surface of a force transducer are respectively in contact with the surfaces of the upper-layer plate and the lower-layer plate; the upper-layer plate, the middle-layer plate and the lower-layer plate are connected by bolts; and conducting wires of the acceleration transducer and the force transducer are respectively led out from notches of the upper-layer plate and the lower-layer plate. The testing device can test the transferring force and the acceleration through a machine leg simultaneously, thereby obtaining the origin impedance and testing the power flow of the machine leg more precisely by using direct methods. As the acceleration transducer is solidified in the installation groove in the middle of the upper-layer plate, the acceleration transducer bears no pressure. Piezoelectric crystals which can bear pressure over 5tons are adopted in the force transducer, so that the testing device can be installed on a much heavier machine leg.
Description
Technical field
The utility model relates to a kind of can measure simultaneously power by the machine under-chassis and acceleration and can with the matching used combination sensing device of vibration isolator.
Background technology
Along with the development of technology, power circuit method and power circuit more and more are applied in the engineering practice as the superiority of evaluation of Vibration index owing to himself.But the former point impedance of accurately measuring under-chassis is the difficult problem of puzzlement vibration research with reaching transmitted power stream always.
The research of structural vibration power circuit is from the seventies in 20th century, progressively further investigation of beginning under people such as Fahy, Noiseaux, Pavic, White drive, the STUDY ON THE ENERGY TRANSFER from beam, plate has all obtained a large amount of achievements up to labyrinths such as ribbing cylindrical shell, Ship Structures.
H.G.D.Goyder in 1980 and R.G.White have studied the power circuit problem of transmission of machine vibration shielding system, clearly provided the notion of power circuit in the literature, studied the some admittance formula on unlimited beam and plate basis under power and torsional interaction, analyzed flexural wave power circuit in compressional wave, torsional wave and flexural wave carry in the unlimited beam power circuit and the plate, that thinks that the Equipment Foundations of some types can assume unlimited extension is convenient to research to simplify practical structures.Power circuit is propagated along the length direction of beam in the beam, and power circuit is cylindrical wave and evenly scatters in the plate, if the source is that moment of torsion then has very strong directivity.The energy and the frequency-independent of power source tablet, the power circuit of source of torque input then is directly proportional with frequency.And the middle ripple of having studied unlimited beam model on the plate propagates and power circuit, and when encourage with power on beam, the behavior of beam is with not have when being coupled the power circuit of beam identical, power circuit in the far field by beam radiation in plate, in the plate power circuit with being directive property cylinder scatter.When encouraging with moment of torsion on the beam, not radiation in plate of torsional wave energy in the beam, the coupling of beam and plate is strengthened.Also studied under power source or the speed source forcing,, thought that then double-layer vibration isolating is better than single-layer partiting polarization as long as resonant frequency is not excited by the power circuit of individual layer or double-layer vibration isolating device input pedestal.
Pinnington and White by measuring vibration isolator the acceleration impedance and up and down the acceleration signal at two ends obtain power circuit indirectly by vibration isolator, have higher signal to noise ratio (S/N ratio).
On the research basis of Pinnington, wide the publishing an article to equipment of tight Ji in 1987---the general expression formula and the measuring method of receiving system oscillation power stream have been done summary.Use the four end parametric methods equipment of more clearly having derived to inject the various expression formula forms of the power circuit of vibration isolator, divide simple harmonic quantity excitation and two kinds of power energisation modes of arbitrary excitation to provide, do the experiment identical with the experiment of Pinnington, obtained vibration isolator transmitted power (cross-spectrum formula) and supporting structure and accepted the spectrum results that power (composing formula certainly) matches.
Mitchell points out because the development of vibration measurement with laser technology comes vibration measuring kinetic power stream also will become possibility with the vibration measurement with laser technology in the future.
Shen Rongying is on the basis of Pinnington research, further research has been done in test to the power circuit by vibration isolator transmission, derive mechanical system and be delivered to three kinds of expression-forms of the power circuit on basis by spring, obtained three kinds of different method of testings of transmitted power stream, the baseband signal of the required measurement of this method is the some admittance of the acceleration signal and the vibration isolator of vibration isolator upper and lower side.
The former light of spring of the Central China University of Science and Technology is measured power circuit with indirect method in " mechanical equipment vibration source characteristic test method " literary composition.
In sum, the power circuit measuring method can be divided into two kinds of direct method and indirect methods, direct method is measured power circuit needs ergometry and acceleration or speed, indirect method is measured power circuit and need be surveyed former point impedance and stride point impedance and acceleration, and no matter use at present direct method still be indirect method when measuring power circuit because the space is limited, the central point of vibration isolator can't be installed and measure to acceleration transducer, near the acceleration that acceleration transducer just can only be got the vibration isolator replaces, this just inevitably produces certain error, if the former point impedance and the power circuit that obtain of criterion is just not inaccurate for measured acceleration.
Measure and to address this problem preferably with reluctance head.Power circuit can be directly obtained, the accuracy that former point impedance guarantees indirect method measurement power circuit can be recorded again.But present reluctance head (combination sensor of acceleration and power) generally is used for impedance measurement and model analysis, can only bear underloading, therefore only to be used for the measurement of light-duty structure, mechanical part and material sample.The CL-YD-331 that can company produces as Jiangsu connection is former point impedance and the power input stream under the energy measurement underloading condition only.But the machine under-chassis on the engineering may bear the pressure more than several tons, therefore is necessary to design a kind of can be used in and measures the sensor that fully loaded transportation condition passes through the power circuit of vibration isolator down.
Force transducer generally has two kinds of piezoelectric type and strain-types, and strain force sensor measures that frequency band is narrower, and simultaneously, strain transducer rigidity is less, destroys by the contact impedance of geodesic structure easily, brings bigger test error.
Summary of the invention
It is a kind of ergometry simultaneously and acceleration that the purpose of this utility model is to provide, and can bear big pressure, and can with the matching used big load broadband power circuit measurement mechanism of vibration isolator.
The purpose of this utility model is achieved in that
Comprise top plate, la m and lower plywood; Acceleration transducer is solidificated in the middle mounting groove of top plate, does not bear pressure; The upper and lower surface of force transducer contacts with the surface of top plate and lower plywood respectively; The upper, middle and lower three ply board connects with screw; The lead of acceleration transducer and force transducer is drawn by fluting on top plate and the la m respectively.
Reserve the mounting hole that is connected with vibration isolator on top plate, la m and the lower plywood.
Described force transducer is quartzy piezoelectric force transducer.
The utility model can be measured transmission power, the acceleration by under-chassis simultaneously, thereby obtains its former point impedance, and available direct method measures the power circuit of under-chassis more accurately.So be not stressed because acceleration transducer is solidificated in the middle circular mounting groove of top plate.Force transducer uses can bear 5 tons of piezoelectric crystals with upward pressure, so the utility model can be installed and heavier machine under-chassis.
Compared with prior art, outstanding advantage of the present utility model is:
At first, can measure former point impedance and under-chassis power circuit under the heavily loaded situation;
Secondly, acceleration measuring point of the present utility model is positioned at the centre position, and is more reasonable, and the measurement of under-chassis impedance, power circuit is convenient, accurate;
Once more, the utility model force sensor measuring frequency band broad and can with the supporting use of vibration isolator.
Description of drawings
Fig. 1 is a structure principle chart of the present utility model.
Fig. 2 is the vertical view of Fig. 1.
Embodiment
For example the utility model is done description in more detail below in conjunction with accompanying drawing:
The utility model is made up of top plate 3, la m 4 and lower plywood 6, and acceleration transducer 1 is solidificated in the middle circular mounting groove of top plate, does not bear pressure; The upper and lower surface of force transducer 2 contacts with the surface of top plate 3 and lower plywood 6 respectively; The upper, middle and lower three ply board connects with sunk screw; The lead 5 of the lead of acceleration transducer 1 and force transducer 2 is drawn by fluting on top plate and the la m respectively; Reserve the mounting hole that is connected with vibration isolator on the utility model upper, middle and lower three ply board.
The utility model can be measured transmission power and the acceleration by under-chassis simultaneously, thereby obtains its former point impedance, and available direct method measures the power circuit of under-chassis more accurately.
So be not stressed because acceleration transducer 1 is solidificated in the middle circular mounting groove of top plate.
Force transducer 2 uses and can bear 5 tons of piezoelectric crystals with upward pressure, so the utility model can be installed on heavier machine under-chassis.
Claims (3)
1. one kind big load broadband power circuit measurement mechanism comprises top plate, la m and lower plywood; It is characterized in that: acceleration transducer is solidificated in the middle mounting groove of top plate, does not bear pressure; The upper and lower surface of force transducer contacts with the surface of top plate and lower plywood respectively; The upper, middle and lower three ply board connects with screw; The lead of acceleration transducer and force transducer is drawn by fluting on top plate and the la m respectively.
2. a kind of big load broadband power circuit measurement mechanism according to claim 1 is characterized in that: reserve the mounting hole that is connected with vibration isolator on top plate, la m and the lower plywood.
3. a kind of big load broadband power circuit measurement mechanism according to claim 1 and 2, it is characterized in that: described force transducer is quartzy piezoelectric force transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200597885U CN202041335U (en) | 2011-03-09 | 2011-03-09 | Large-load wide-band power flow testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200597885U CN202041335U (en) | 2011-03-09 | 2011-03-09 | Large-load wide-band power flow testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202041335U true CN202041335U (en) | 2011-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200597885U Expired - Fee Related CN202041335U (en) | 2011-03-09 | 2011-03-09 | Large-load wide-band power flow testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202041335U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183329A (en) * | 2011-03-09 | 2011-09-14 | 哈尔滨工程大学 | Large-load broadband power flow measuring device |
-
2011
- 2011-03-09 CN CN2011200597885U patent/CN202041335U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183329A (en) * | 2011-03-09 | 2011-09-14 | 哈尔滨工程大学 | Large-load broadband power flow measuring device |
| CN102183329B (en) * | 2011-03-09 | 2012-08-22 | 哈尔滨工程大学 | Large-load broadband power flow measuring device |
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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: 20111116 Termination date: 20140309 |