CN205879667U - Soil sample resonance post device - Google Patents
Soil sample resonance post device Download PDFInfo
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- CN205879667U CN205879667U CN201620713948.6U CN201620713948U CN205879667U CN 205879667 U CN205879667 U CN 205879667U CN 201620713948 U CN201620713948 U CN 201620713948U CN 205879667 U CN205879667 U CN 205879667U
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- soil sample
- fixed pulley
- pulley
- weight
- mass
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Abstract
The utility model discloses a soil sample resonance post device, move sensor, steel cable, assembly pulley and balancing piece including base, quality piece, vertical bit, wherein the quality piece comprises cross, magnet, accelerometer and balancing weight, serves for 4 of the cross and all installs the bar magnet, and the both ends of each bar magnet are all overlapped and are equipped with the coil, accelerometer and balancing weight are installed respectively at the radial edge of cross, and both weight equal, make the quality piece balanced. The bottom mounting of soil sample is on the base, and the top is connected with the quality piece is central. Balancing piece that weight equals and quality rope connection for the piece makes it balanced through the assembly pulley to reduce the quality piece to the influence of native sample in test procedure. When the coil has the electric current to flow through, will drive the quality piece and make native sample take place the wrench movement, accelerometer is used for detecting the angular acceleration signal of native sample wrench movement. Accomplish the measurement to native sample resonance frequency and damping ratio through the angular acceleration signal.
Description
Technical field
This utility model relates to soil sample Resonant Column device.
Background technology
The buildings such as the bridge on ground, house by earthquake, traffic loading vibration or during mechanical oscillation, make soil and these
Building system bears the vibration of different amplitudes and frequency, and once the resonant frequency of these building systems falls in external load
Frequency range, will resonate, building produced greatly harm.The dynamic properties of soils of research soil, to shockproof, damping and anti-
Calamity has extremely important meaning.
Resonant Column is the important tests equipment of test soil dynamic parameters, and it is by applying different frequency and amplitude to soil
Load realizes measuring and analyze soil dynamic properties of soils, for measuring dynamically soil character from small strain to moderate strains.Resonant Column
The theoretical basis of test is ripple communication theory-wave theory in the soil body.Typical resonant column test model is as shown in Figure 1.Examination
Sample is the solid or hollow cylindrical soil body, and bottom is fixed on pedestal, and top adds a Rigid Mass block, and can be by water
Flat direction of rotation freely swings, i.e. other end structure freely is fixed in one end.By mass, sample applied twisting resistance, sample
Vibration will be rotated with.
At present, having two ways to realize resonant column test in the world, one is free vibration method, by torque drivers, generation
The coil in moment of torsion magnetic field, acceleration transducer, charge amplifier and ripple monitor etc. form, as shown in Figure 2.Top at test specimen
Applying a moment of torsion, make sample generation angular displacement of having a try, then discharge torsion, test specimen will be in free damping state, according to each
Individual free oscillating period, TiTry to achieve average frequency, be approximately resonant frequency.Two is resonance method, signal generator apply to test specimen
The sine wave of certain frequency scope, and start to gradually rise from 0Hz, constantly detection sample response frequency, until maximum strain
Amplitude looks for resonant frequency.When strain amplitude is in maximum, low-limit frequency is the fundamental frequency of system under test (SUT).Fig. 3 gives employing
Lee sajous graphics measures the scheme of resonant frequency.The vibration signal of oscillograph y passage input sample, x passage input drive signal
The signal in source.Owing to being linear system, vibration signal is identical with the frequency of signal source, but power amplifier, coil are to signal meeting
Produce phase shift, therefore one ellipse of oscilloscope display.The output frequency of regulation signal source, starts constantly to rise from 0Hz, makes display
Transverse the longest, frequency now is resonant frequency.
All there is certainty of measurement in above two mode and accuracy such as is extremely limited at the defect.
Utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide soil sample Resonant Column device, it is possible to
Reduce the mass impact on soil sample, improve certainty of measurement.
This utility model realizes by the following technical solutions:
Soil sample Resonant Column device, including pedestal, soil sample, mass, steel cable, assembly pulley and balance weight, wherein quality
Block includes cross, bar magnet, accelerometer and balancing weight, and 4 of cross hold and are fitted with bar magnet, each
The two ends of shape Magnet are all arranged with coil；Balancing weight is fixed on cross, the weight phase of the weight of balancing weight and accelerometer
Deng, and balancing weight and accelerometer be symmetrical arranged with the axis of mass for axis of symmetry；The bottom of soil sample is fixed on pedestal,
Top is connected with mass center；One end of steel cable is connected with the center of mass, and steel cable is set around assembly pulley, another of steel cable
End is connected with balance weight, and the weight of this balance weight is for offsetting the weight of mass.
Preferably, mass is also arranged above vertical displacement sensor, and this vertical displacement sensor is used for detecting soil sample
Displacement in vertical direction in vibration processes, for user as reference.
Preferably, the longitudinal edge of described cross is respectively equipped with acceleration transducer and equiponderant with acceleration machine joins
Pouring weight, makes mass balance, and angular acceleration when this acceleration transducer is for detecting soil sample vibration, for user as ginseng
Examine.
Preferably, the top of described soil sample and bottom are respectively equipped with a permeable stone, and the permeable stone at soil sample top is fixed
In mass center, the permeable stone of the bottom of soil sample is fixed on pedestal, and two permeable stones are all connected with a drain pipe, and
Drain pipe passes through the bottom of pedestal to ft connection.
Preferably, soil sample Resonant Column device also includes plexiglass box, described soil sample, mass, steel cable, pulley
Group and balance weight are respectively positioned in plexiglass box.
Preferably, described plexiglass box is provided with passage, the source of the gas outside the connection of this passage.Outside source of the gas leads to
Cross passage to be passed through to plexiglass box, to regulate the pressure needed for soil sample.
Preferably, any one structure during described assembly pulley is following structure one to structure three:
Structure one: assembly pulley includes a fixed pulley, the other end of described steel cable is fixed sliding from this after being set around this fixed pulley
Wheel leads to be connected with balance weight；
Structure two: assembly pulley includes the first fixed pulley and the second fixed pulley, the other end of described steel cable is set around successively
Lead to be connected with balance weight from the second fixed pulley after one fixed pulley, the second fixed pulley；
Structure three: assembly pulley includes that the first fixed pulley, the second fixed pulley and the 3rd fixed pulley, the first fixed pulley and second are determined
Pulley is positioned on same level line, and the 3rd fixed pulley is positioned at the first fixed pulley and the top of the second fixed pulley, and described steel cable is with S word
The track of type leads to flat from the 3rd fixed pulley after being set around the first fixed pulley, the second fixed pulley and the 3rd fixed pulley successively
Weighing apparatus block connects.
Compared to existing technology, the beneficial effects of the utility model are:
Controller of the present utility model is by the angular acceleration signal of accelerometer detection soil sample twisting, at signal
Reason finally gives resonant frequency and the damping ratio of soil sample.By pulley and the setting of balance weight, offset the weight of mass, with
Reduce mass to soil sample impact in test process, improve degree of accuracy further.
Accompanying drawing explanation
Fig. 1 is the resonant column test illustraton of model of prior art.
Fig. 2 is the system structure schematic diagram of the free vibration method of prior art.
Fig. 3 is the system structure schematic diagram of the resonance method of prior art.
Fig. 4 is the overall structure figure of soil sample Resonant Column device of the present utility model.
Fig. 5 is the structure chart of mass of the present utility model.
Fig. 6 is shell, the pedestal schematic diagram received of the present utility model.
Fig. 7 is soil sample of the present utility model, permeable stone and drain structure schematic diagram.
In figure: 1, soil sample；2, mass；3, pedestal；4, steel cable；5, assembly pulley；6, balance weight；7, cross；8, magnetic
Ferrum；9, accelerometer；10, balancing weight；11, connector；12, plexiglass box；13, permeable stone；14, drain pipe.
Detailed description of the invention
Below, in conjunction with accompanying drawing and detailed description of the invention, this utility model is described further:
Seeing Fig. 4 to Fig. 7, this utility model provides a kind of soil sample Resonant Column device, for measuring soil sample, bag
Include the plexiglass box 12 of cylinder, in plexiglass box 12, be provided with soil sample 1, mass 2, steel cable 4, pulley
Group 5 and balance weight 6.
Pedestal 3 is fixed on the bottom surface of plexiglass box 12, and soil sample 1 is fixed on pedestal 3, and soil sample is by rubber membrane bag
Dress, is arranged on pedestal 3 by assembling shell, and rubber membrane is close to assemble inside shell, and evacuation processes, it is ensured that soil sample is cylinder
Shape, mass 2 is arranged on soil sample 1 upper end, after soil sample 1 installation, assembling shell of dismantling.Mass 2 include cross 7,
11, four blocks of Magnet 8 of connector and accelerometer 9, four blocks of bar magnets 8 are uniformly fixed on cross 7 by connector 11 respectively
On, the two ends of each block of bar magnet 8 are rotating around being provided with a coil (not shown)；One end of steel cable 4 and the central point of mass 2
Connecting, the other end leads to be connected with balance weight 6 from assembly pulley 5 after being set around assembly pulley 5, and accelerometer 9 is arranged on cross 7
Edge, accelerometer 9 is for detecting the angular acceleration signal of soil sample 1.Fig. 2 can be participated in, the most also include electricity
Lotus amplifier, charge amplifier angular acceleration signal is converted to voltage, it is possible to be delivered to monitor.Drive system provides
Drive signal to coil.
The structure of assembly pulley 5 can have at least three kinds of embodiments, and one is that assembly pulley 5 includes a fixed pulley, described
The other end of steel cable 4 leads to be connected with balance weight 6 from this fixed pulley after being set around this fixed pulley.Its two assembly pulley 5 includes two
Individual fixed pulley, is the first fixed pulley and the second fixed pulley, the other end of described steel cable 4 be set around successively the first fixed pulley, second
Leading to be connected with balance weight 6 from the second fixed pulley after fixed pulley, it will be understood that in the second structure, steel cable 4 is all winding
In the upper slide rail of two fixed pulleys, concrete, the other end of steel cable 4 first slide rail with the first fixed pulley top contacts and draws
To the slide rail on the second fixed pulley top, the other end of rear steel rope 4 lead to downwards be connected with balance weight 6 from the second fixed pulley；
For assembly pulley, it three includes that the first fixed pulley, the second fixed pulley and the 3rd fixed pulley, the first fixed pulley and the second fixed pulley are positioned at
On same level line, the 3rd fixed pulley is positioned at the first fixed pulley and the top of the second fixed pulley, and described steel cable 4 is with the rail of S font
Mark leads to balance weight 6 even from the 3rd fixed pulley after being set around the first fixed pulley, the second fixed pulley and the 3rd fixed pulley successively
Connect.In the third structure, it will be understood that first the other end of steel cable 4 passes through from the slide rail on the first fixed pulley top and lead to
The slide rail of the second fixed pulley bottom, and the slide rail on the 3rd fixed pulley top is led to from the second fixed pulley, fixed sliding from the 3rd afterwards
Wheel leads to downwards be connected with balance weight 6.Pulley block structure shown in Fig. 4 is the third embodiment above-mentioned.
Mass 2 has certain weight, and is fixing in test process, unmodifiable, thus mass 2
It is applied with certain gravity on soil sample 1, the weight of this mass 2 can be offset by balance weight 6, i.e. the weight of balance weight 6
Amount is equal to the weight of mass 2, so that measurement result is more accurate.
During measurement, drive system output drive signal, to coil, makes there is electric current process in coil, phase interaction between Magnet 8
With producing active force, make mass 2 movement under force, twist so that soil sample and then twisting, and gathered by accelerometer 9
Angular acceleration signal finally obtain resonant frequency.
Owing to accelerometer 9 itself also has certain weight, the most also can affect measurement result, therefore make
For improving, mass 2 also includes that a balancing weight 10, the weight of this balancing weight 10 are equal in weight with accelerometer 9, balancing weight 10
It is symmetricly set on cross 7 for axis of symmetry with the axis of mass with accelerometer 9, it is possible to balance the weight of accelerometer 9
Amount.
It is additionally provided with on the cross 7 of mass 2 and is respectively perpendicular displacement transducer (not shown) and acceleration transducer (is not schemed
Show), acceleration transducer is fixed on the edge of mass 2, and this vertical displacement sensor is used for detecting mass 2 at Vertical Square
Displacement upwards；Acceleration transducer is for detecting horizontal angle acceleration when soil sample 1 vibrates.Horizontal angle acceleration is with vertical
Displacement is available for user as reference.
Seeing Fig. 7, owing to soil sample would generally contain moisture, unavoidable moisture flow to bottom holding shell 1, especially in vibration
During, moisture can be separated from soil sample, thus be respectively equipped with a permeable stone 13 in the bottom of soil sample 1 and top, soil
Sample Resonant Column device also includes that drain pipe 14, the permeable stone at soil sample top are fixed on mass center, soil sample
The permeable stone of bottom is fixed on pedestal, and two permeable stones are all connected with a drain pipe, and drain pipe is outside by the bottom of pedestal
Portion connects.
Plexiglass box 12 is provided with passage, the source of the gas outside the connection of this passage.Outside source of the gas is by logical
Pore is passed through to plexiglass box 12, the atmospheric pressure local to simulate soil sample place so that measure more accurate.
It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various
Corresponding change and deformation, and all these change and deformation all should belong to the protection of this utility model claim
Within the scope of.
Claims (7)
1. soil sample Resonant Column device, it is characterised in that include pedestal, soil sample, mass, steel cable, assembly pulley and balance weight,
Wherein mass includes cross, bar magnet, accelerometer and balancing weight, and 4 ends of cross are fitted with bar shaped magnetic
Ferrum, the two ends of each bar magnet are all arranged with coil；Balancing weight is fixed on cross, the weight of balancing weight and accelerometer
Be equal in weight, and balancing weight and accelerometer are symmetrical arranged with the axis of mass for axis of symmetry；The bottom of soil sample is fixed
On pedestal, top is connected with mass center；One end of steel cable is connected with the center of mass, and steel cable is set around assembly pulley,
The other end of steel cable is connected with balance weight, and the weight of this balance weight is for offsetting the weight of mass.
2. soil sample Resonant Column device as claimed in claim 1, it is characterised in that being also arranged above of described mass is vertical
Displacement transducer, this vertical displacement sensor is for soil detection soil sample displacement in vibration processes.
3. soil sample Resonant Column device as claimed in claim 1, it is characterised in that the longitudinal edge of described cross is respectively equipped with
Acceleration transducer and balancing weight equiponderant with acceleration machine, make mass balance, and this acceleration transducer is used for detecting
Angular acceleration during soil sample vibration.
4. soil sample Resonant Column device as claimed in claim 1, it is characterised in that the top of described soil sample and bottom are respectively
Being provided with a permeable stone, the permeable stone at soil sample top is fixed on mass center, and the permeable stone of the bottom of soil sample is fixed
On pedestal, two permeable stones are all connected with a drain pipe, and drain pipe passes through the bottom of pedestal to ft connection.
5. soil sample Resonant Column device as claimed in claim 1, it is characterised in that soil sample Resonant Column device also includes organic
Glass container, described soil sample, mass, steel cable, assembly pulley and balance weight are respectively positioned in plexiglass box.
6. soil sample Resonant Column device as claimed in claim 5, it is characterised in that described plexiglass box is provided with ventilation
Hole, the source of the gas outside the connection of this passage.
7. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described assembly pulley is following structure one to knot
Any one structure in structure three:
Structure one: assembly pulley includes a fixed pulley, the other end of described steel cable draws from this fixed pulley after being set around this fixed pulley
Go out and be connected to balance weight；
Structure two: assembly pulley includes the first fixed pulley and the second fixed pulley, it is fixed that the other end of described steel cable is set around first successively
Lead to be connected with balance weight from the second fixed pulley after pulley, the second fixed pulley；
Structure three: assembly pulley includes the first fixed pulley, the second fixed pulley and the 3rd fixed pulley, the first fixed pulley and the second fixed pulley
Being positioned on same level line, the 3rd fixed pulley is positioned at the first fixed pulley and the top of the second fixed pulley, and described steel cable is with S font
Track leads to balance weight even from the 3rd fixed pulley after being set around the first fixed pulley, the second fixed pulley and the 3rd fixed pulley successively
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620713948.6U CN205879667U (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance post device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620713948.6U CN205879667U (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance post device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205879667U true CN205879667U (en) | 2017-01-11 |
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ID=57696534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620713948.6U Expired - Fee Related CN205879667U (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance post device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205879667U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928774B (en) * | 2016-07-07 | 2019-08-23 | 广州国光仪器有限公司 | Soil sample resonance column device |
-
2016
- 2016-07-07 CN CN201620713948.6U patent/CN205879667U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928774B (en) * | 2016-07-07 | 2019-08-23 | 广州国光仪器有限公司 | Soil sample resonance column device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20180707 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |