CN220961104U - Liquid damping coefficient measuring device - Google Patents
Liquid damping coefficient measuring device Download PDFInfo
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- CN220961104U CN220961104U CN202322753655.3U CN202322753655U CN220961104U CN 220961104 U CN220961104 U CN 220961104U CN 202322753655 U CN202322753655 U CN 202322753655U CN 220961104 U CN220961104 U CN 220961104U
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- 238000013016 damping Methods 0.000 title claims abstract description 41
- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The application provides a liquid damping coefficient measuring device, which belongs to the field of damping coefficient measurement, and is characterized in that a motor is used for pushing a whole bracket to move left and right so as to drive a sample box to periodically rotate, so that the rotation angle and amplitude parameters of the sample box are obtained, and the damping coefficient of liquid to be measured in the sample box can be obtained. The measuring device has the characteristics of wide measuring range, stable phenomenon, easiness in observation, simpler structure, easiness in operation and the like, and the factors such as the rotation angle, the air resistance and the like have small interference on the measuring result and the measuring result is stable.
Description
Technical Field
The application relates to the technical field of damping coefficient measurement, in particular to a liquid damping coefficient measurement device.
Background
The liquid damping coefficient is an important parameter reflecting the liquid flowing degree, and the research of the liquid damping coefficient has important significance for industries such as civil engineering materials, building structure earthquake-proof design and the like. The measurement of the damping coefficient of the fluid is also important in production and life, such as the application of a liquid damper to the measurement of the shock resistance of a building structure, space satellites, ocean going ships and other fields. The current mainstream damping coefficient measuring method is a navigation body fluid damping force coefficient CFD calculation method, a fluid pipeline damping coefficient measuring method, an ALE finite element method and the like. The methods have higher requirements on the precision of the measuring device, are complex to operate, and have certain limitations on the measurement of the fluid damping coefficients in different ranges.
Disclosure of Invention
The application provides a liquid damping coefficient measuring device which is simple to operate and can realize measurement of fluid damping coefficients in different ranges.
The application provides a liquid damping coefficient measuring device, which comprises:
a horizontal load-bearing platform;
The integral support is arranged on the horizontal bearing platform, and is driven by a motor to enable the integral support to periodically move left and right along the horizontal bearing platform, wherein the integral support comprises a first transverse rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are respectively fixed on the first transverse rod at intervals of preset distances, and the height of the first vertical rod is larger than that of the second vertical rod;
The center of the angle dial is coincident with the center of the bearing, and the angle dial is fixed at the top end of the first vertical rod through the bearing;
The sample box is used for injecting liquid to be detected, is connected with the bearing through a light rod, periodically swings left and right by taking the bearing as a fulcrum, and reads the rotation angle of the swing on the angle dial through the light rod;
The first measuring piece is connected with the sample box;
The first photoelectric door is arranged on the second vertical rod, and drives the first measuring piece to swing to the front of the first photoelectric door through the swing of the sample box, so as to measure the swing period of the sample box;
The second measuring piece is arranged at one end of the first cross rod;
The second photoelectric door is fixed on the horizontal bearing platform and is at a position with the same height as the second measuring sheet, and the moving period of the integral bracket is measured by moving the integral bracket left and right along the horizontal bearing platform so that the second measuring sheet is close to the second photoelectric door;
the first period tester is connected with the first photoelectric gate and is used for setting the measurement period of the first photoelectric gate;
The second period measuring instrument is connected with the second photoelectric gate and is used for setting the measuring period of the second photoelectric gate;
And the measuring module is used for reading the period of the sample box measured by the first period measuring instrument when the degrees of the first period measuring instrument and the degrees of the second period measuring instrument are stable, and obtaining the damping coefficient of the liquid to be measured in the sample box according to the rotation angle, the amplitude and the period of the sample box.
In the application, the horizontal bearing platform is provided with a groove, and the integral bracket moves along the groove in a left-right linear manner.
In the present application, the measuring device further includes:
a plurality of orientation wheels disposed below the first rail.
In the application, the motor is a reciprocating motor with adjustable frequency, and the motor is connected with the second vertical rod so as to push the integral bracket to periodically move left and right.
In the application, the sample box comprises a plurality of vertical small lattices with the same volume, the upper part of each lattice is provided with a water injection hole, when in measurement, one lattice is filled from the middle to two sides each time, and after the liquid to be measured is filled, the sample box is plugged by a rubber plug.
In the application, the sample box is a square box with a side length of 6cm, the inside of the sample box is vertically divided into 10 small lattices with the same volume, and each small lattice is formed by sticking a sub-force gram plate with the thickness of 1 mm.
In the application, the material of the integral bracket and the bearing platform is iron.
In the application, the bearing has an inner diameter of 15mm, an outer diameter of 35mm and a thickness of 11mm.
In the present application, the measurement period of the first period meter is twice the measurement period of the second period meter.
In the application, the inner diameter of the bearing is 15mm, the outer diameter is 35mm, and the thickness is 11mm;
The angle dial has a diameter of 20cm.
The liquid damping coefficient measuring device has the characteristics of wide measuring range, stable phenomenon, easiness in observation, simpler structure, easiness in operation and the like. The liquid damping coefficient is measured by the measuring device, so that damping effects of different liquids and damping efficiency of the same kind of fluids with different capacity ratios in the damper can be studied, an optimal liquid proportioning scheme in the damper is found, and the aim of damping the structure is fulfilled.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a liquid damping coefficient measuring device according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of a sample cartridge according to an embodiment of the present application;
FIG. 3 is a graph of amplitude-frequency characteristics of forced vibration at full grid according to an embodiment of the present application.
Reference numerals illustrate: the angle dial 1, the bearing 2, the light rod 3, the integral bracket 4, the sample box 5, the first measuring plate 6, the first photoelectric door 7, the directional wheel 8, the second measuring plate 9, the second photoelectric door 10, the frequency-adjustable reciprocating motor 11, the first period measuring instrument 12, the second period measuring instrument 13 and the bearing platform 14.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
Fig. 1 is a schematic structural diagram of a device for measuring a damping coefficient of a liquid according to an embodiment of the present application.
As shown in fig. 1, the liquid damping coefficient measuring device includes:
a horizontal load-bearing platform;
The integral support is arranged on the horizontal bearing platform and driven by a motor to periodically move left and right along the horizontal bearing platform, wherein the integral support comprises a first cross rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are respectively fixed on the first cross rod by taking a preset distance as a distance, and the height of the first vertical rod is larger than that of the second vertical rod;
the center of the angle dial is coincident with the center of the bearing, and the angle dial is fixed at the top end of the first vertical rod through the bearing;
The sample box is used for injecting liquid to be detected, is connected with the bearing through the light rod, periodically swings left and right by taking the bearing as a fulcrum, and reads the rotation angle on the angle dial when swinging through the light rod;
the first measuring piece is connected with the sample box;
The first photoelectric door is arranged on the second vertical rod, and drives the first measuring piece to swing to the front of the first photoelectric door through the swing of the sample box, so as to measure the swing period of the sample box;
the second measuring piece is arranged at one end of the first cross rod;
The second photoelectric door is fixed on the horizontal bearing platform and is in a position with the same height as the second measuring sheet, and the moving period of the integral bracket is measured by moving the integral bracket left and right along the horizontal bearing platform to enable the second measuring sheet to be close to the second photoelectric door;
The first period tester is connected with the first photoelectric gate and is used for setting the measurement period of the first photoelectric gate;
The second period tester is connected with the second photoelectric gate and is used for setting the measurement period of the second photoelectric gate;
And the measuring module (not shown in fig. 1) is used for reading the period of the sample box measured by the first period measuring instrument when the degrees of the first period measuring instrument and the degrees of the second period measuring instrument are stable, and obtaining the damping coefficient of the liquid to be measured in the sample box according to the rotation angle, the amplitude and the period of the sample box.
It can be understood that the calculation method in the embodiment of the present application is an existing method, and parameters required in the calculation method are obtained by the measurement device in the embodiment of the present application. The measuring device provided by the embodiment of the application has the advantages of simple structure, convenience in operation and easiness in measurement.
In the embodiment of the application, the horizontal bearing platform is provided with the groove, and the integral bracket moves linearly left and right along the groove.
In an embodiment of the application, the measuring device further comprises:
the plurality of orientation wheels are arranged below the first cross bar.
Specifically, the embodiment of the application can be provided with 4 directional wheels, the diameter of the directional wheels is 4cm, the width of the directional wheels is 2cm, the directional wheels are respectively fixed at four corners below the first cross bar, and the directional wheels move linearly left and right through the concave grooves of the bearing platform 14.
In the embodiment of the application, the motor is a reciprocating motor with adjustable frequency, and the motor is connected with the second vertical rod so as to push the whole bracket to periodically move left and right and then drive the sample box 5 to periodically rotate.
In the embodiment of the application, the sample box comprises a plurality of vertical small lattices with the same volume, the upper part of each lattice is provided with a water injection hole, when in measurement, one lattice is filled from the middle to two sides each time, and after the liquid to be measured is filled, the sample box is plugged by a rubber plug, as shown in fig. 2.
In the embodiment of the application, the sample box is a square box with a side length of 6cm, the inside of the sample box is vertically divided into 10 small lattices with the same volume, each small lattice is formed by sticking a sub-force gram plate with the thickness of 1mm, and each lattice is impermeable to water.
In the embodiment of the application, the whole bracket and the bearing platform are made of iron.
In the embodiment of the application, the bearing has an inner diameter of 15mm, an outer diameter of 35mm and a thickness of 11mm.
In an embodiment of the application, the measurement period of the first period meter is twice the measurement period of the second period meter.
In the embodiment of the application, the inner diameter of the bearing is 15mm, the outer diameter is 35mm, and the thickness is 11mm;
The angle dial has a diameter of 20cm.
As shown in fig. 1, the bearing platform 14 is a main platform of the liquid damping coefficient measuring device, and a groove is engraved on the left side of the first cross bar, so that the directional wheel 8 can move linearly. The testing device is connected as shown in fig. 1, the rotating angle of the light rod 3 on the angle dial 1 can be read out by a video recording mode, and then the amplitude of the sample box 5 is obtained by a formula. The sample box 5 can be vertically divided into 10 small lattices with the same volume, the upper part of each lattice is provided with a water injection hole, one lattice is filled from the middle to the two sides each time, the gravity center of the lattice is ensured to be unchanged during experiments, and the rubber plug is used for plugging after water injection. In the experimental process, the first photoelectric gate 7 can measure the period of the first measuring plate 6 and the period of the sample box; the second photogate 10 can measure the period of the second blade 9, as well as the overall device and motor period. When the first measuring piece passes through the photoelectric gate twice, the second measuring piece only passes through the photoelectric gate once, so that the measuring period of the first period measuring instrument is twice that of the second period measuring instrument, the measuring period of the first period measuring instrument 12 can be adjusted to 10, and the measuring period of the second period measuring instrument 13 can be adjusted to 5, and the same measuring period is ensured. The reciprocating motor 11 may provide a periodic external force to the left-side moving means.
In the embodiment of the application, the photoelectric gate is a correlation type photoelectric gate, the frequency of the adjustable reciprocating motor is 0 to 10 revolutions per second, and the reciprocating motor is connected with the integral bracket through an iron frame and a bearing.
After the whole device is stabilized (the first cycle meter 12 and the second cycle meter 13, if the readings are the same, the cycle of the sample cartridge 5 can be read out by the first cycle meter 12. And then the damping coefficient of the liquid in the sample box 5 is calculated according to the law of rotation, newton's law and the like. The measuring device has the advantages of simple structure, easy operation, small interference to the measuring result caused by factors such as rotation angle, air resistance and the like, stable measuring result and relatively simple and easily understood principle.
Forced vibration under the action of periodic external force, wherein the forced vibration is vibration of an object under the continuous action of the periodic external force, and the periodic external force is called driving force (or forced force). If the driving force is changed according to the simple harmonic vibration law, the forced vibration in the steady state is also the simple harmonic vibration. The amplitude of the vibration is related to the frequency of the driving force and the natural frequency of the original vibration system.
According to the law of rotation, the forced kinematics equation is:
In the above formula, J is the moment of inertia of the balance, M 0 is the amplitude of the driving external moment, and ω is the angular frequency of the driving external moment.
The amplitude can be approximated as:
Under the condition of small damping, as can be obtained from the above equation, when |ω 0 - ω|=β, the amplitude falls to the peak value The value of beta can be determined from the corresponding point of the amplitude-frequency characteristic (omega 0/omega on the abscissa θ).
In the vicinity of the resonance position (ω=ω 0) and where the damping coefficient is small (β 2≤ω2 is satisfied), since ω 0+ω＝2ω0, it can be derived that:
When (when) I.e./>When expressed by the above formula ω 0 +ω= ±β. This ω corresponds to the graph/>Two values ω 1、ω2, from which:
and is also represented by the formula Get/>And the abscissa ω/ω 0 of the amplitude-frequency characteristic is also denoted by T 0/T.
As shown in fig. 3, an amplitude-frequency characteristic curve (ω/ω 0 on the abscissa and θ on the ordinate) is plotted, and the damping coefficient β is measured according to the above procedure.
In one embodiment of the application, the measurement steps are as follows:
(1) The measuring device shown in fig. 1 is built;
(2) And filling the sample box with 1 grid of water, and after the device is stationary, adjusting the measurement period of the first period measuring instrument 12 to 10, and adjusting the measurement period of the second period measuring instrument 13 to 5 to ensure that the measurement periods are the same. The cycle meters 12, 13 are turned on. The initial frequency of the reciprocating motor 11 is regulated to be 0.6 r/s, the reciprocating motor 11 is turned on, periodic external force is provided for the left integral bracket, the periodic change is presented to the whole device, the period measuring instruments 12 and 13 are reset, and if the time values of the measuring periods are the same, namely the movement periods of the motor and the sample box are the same, the amplitude is stable, and experimental data can be measured. And reading the angle alpha 1 at the rightmost side of the vertical frame of the camera in the movement process of the dial, and obtaining the thetan by taking the amplitude thetan= (180-2 alpha n) x L and L as the length from the center of the bearing to the center of gravity of the lattice box. The forced vibration period T is read out from the period measuring instrument 12.
(3) The motor frequency at this time is kept unchanged, and the damping vibration period T 0 when the lattice box is empty is measured.
(4) The above experiment was repeated by adjusting the motor from an initial frequency of 0.6 rpm (when the motor frequency was too low, the influence of air resistance and friction between instruments was large, the initial frequency was adjusted to 0.6 rpm, the air resistance and friction were negligible), up-adjusting 0.1 at a time, and the final frequency was adjusted to 2 rpm (approximately 1.5 times the motor frequency at ω=ω 0).
(5) And drawing an amplitude-frequency characteristic curve graph of forced vibration, and obtaining a damping coefficient beta 2.
(6) The above experiment was repeated by changing the number of lattices filled with water.
The liquid damping coefficient measuring device provided by the embodiment of the application has the characteristics of wide measuring range, stable phenomenon, easiness in observation, simpler device structure, easiness in operation and the like. The liquid damping coefficient is measured by the measuring device, so that damping effects of different liquids and damping efficiency of the same kind of fluids with different capacity ratios in the damper can be studied, an optimal liquid proportioning scheme in the damper is found, and the aim of damping the structure is fulfilled.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Claims (10)
1. A liquid damping coefficient measuring device, comprising:
a horizontal load-bearing platform;
The integral support is arranged on the horizontal bearing platform, and is driven by a motor to enable the integral support to periodically move left and right along the horizontal bearing platform, wherein the integral support comprises a first transverse rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are respectively fixed on the first transverse rod at intervals of preset distances, and the height of the first vertical rod is larger than that of the second vertical rod;
The center of the angle dial is coincident with the center of the bearing, and the angle dial is fixed at the top end of the first vertical rod through the bearing;
The sample box is used for injecting liquid to be detected, is connected with the bearing through a light rod, periodically swings left and right by taking the bearing as a fulcrum, and reads the rotation angle of the swing on the angle dial through the light rod;
The first measuring piece is connected with the sample box;
The first photoelectric door is arranged on the second vertical rod, and drives the first measuring piece to swing to the front of the first photoelectric door through the swing of the sample box, so as to measure the swing period of the sample box;
The second measuring piece is arranged at one end of the first cross rod;
The second photoelectric door is fixed on the horizontal bearing platform and is at a position with the same height as the second measuring sheet, and the moving period of the integral bracket is measured by moving the integral bracket left and right along the horizontal bearing platform so that the second measuring sheet is close to the second photoelectric door;
the first period tester is connected with the first photoelectric gate and is used for setting the measurement period of the first photoelectric gate;
The second period measuring instrument is connected with the second photoelectric gate and is used for setting the measuring period of the second photoelectric gate;
And the measuring module is used for reading the period of the sample box measured by the first period measuring instrument when the degrees of the first period measuring instrument and the degrees of the second period measuring instrument are stable, and obtaining the damping coefficient of the liquid to be measured in the sample box according to the rotation angle, the amplitude and the period of the sample box.
2. The device according to claim 1, wherein a groove is formed on the horizontal carrying platform, and the integral bracket moves linearly left and right along the groove.
3. The apparatus of claim 2, wherein the measuring device further comprises:
a plurality of orientation wheels disposed below the first rail.
4. The apparatus of claim 1, wherein the motor is a reciprocating motor with adjustable frequency, and wherein the motor is connected to the second vertical rod to push the integral bracket to periodically move left and right.
5. The device according to claim 1, wherein the sample box comprises a plurality of vertical small lattices of the same volume, a water injection hole is arranged at the upper part of each lattice, and when the liquid to be measured is measured, the lattices are filled from the middle to the two sides each time, and after the liquid to be measured is filled, the liquid to be measured is plugged by a rubber plug.
6. The device according to claim 5, wherein the sample box is a square box with a side length of 6cm, the inside is vertically divided into 10 small lattices with the same volume, and each small lattice is formed by sticking a sub-gram plate with a thickness of 1 mm.
7. The apparatus of claim 1, wherein the integral support and the load-bearing platform are both iron.
8. The device of claim 1, wherein the bearing has an inner diameter of 15mm, an outer diameter of 35mm, and a thickness of 11mm.
9. The apparatus of claim 1, wherein the first periodic meter has a measurement period that is twice the measurement period of the second periodic meter.
10. The device of claim 1, wherein the bearing has an inner diameter of 15mm, an outer diameter of 35mm, and a thickness of 11mm;
The angle dial has a diameter of 20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322753655.3U CN220961104U (en) | 2023-10-13 | 2023-10-13 | Liquid damping coefficient measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322753655.3U CN220961104U (en) | 2023-10-13 | 2023-10-13 | Liquid damping coefficient measuring device |
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| Publication Number | Publication Date |
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| CN220961104U true CN220961104U (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322753655.3U Active CN220961104U (en) | 2023-10-13 | 2023-10-13 | Liquid damping coefficient measuring device |
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| CN (1) | CN220961104U (en) |
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- 2023-10-13 CN CN202322753655.3U patent/CN220961104U/en active Active
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