CN110017956A - A kind of twin legged thin wall pier bracket precompressed test macro - Google Patents
A kind of twin legged thin wall pier bracket precompressed test macro Download PDFInfo
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- CN110017956A CN110017956A CN201910304474.8A CN201910304474A CN110017956A CN 110017956 A CN110017956 A CN 110017956A CN 201910304474 A CN201910304474 A CN 201910304474A CN 110017956 A CN110017956 A CN 110017956A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
The present invention provides a kind of twin legged thin wall pier bracket precompressed test macro, utilize central processing unit, loader, two force snesors, signal processing circuit, image collecting device, image processing module, oil pump driver, display and memory carry out precompressed test to bracket, during the test, hydraulic jack is monitored bracket institute to be measured stress using force snesor, so that hydraulic jack is the default force value of staff to bracket pressure applied to be measured, it is exerted a force and is calibrated according to the force value that staff inputs to hydraulic jack using force snesor, make so higher in the precision for carrying out precompressed to twin legged thin wall pier bracket, it reuses image collecting device and acquires image information of the bracket to be measured in course of exerting pressure in real time, bracket be can not only obtain in the deformation being applied under fixed force, it can also It observes the deformation of bracket during force, compared with the prior art tests more comprehensively.
Description
Technical field
The present invention relates to intelligence test field more particularly to a kind of twin legged thin wall pier bracket precompressed test macros.
Background technique
Third and fourth connection of certain city's Section of Outer Ring Line road project main line overpass is 55+3 × 100+55m continuous rigid frame, is to cross over
Planning road and be arranged.Bridge zone hypsography is larger.Bridge is in road horizontal curve, and R=1270m, bridge deck becomes with curve
Change, bridge longitudinal slope is 3%, horizontal slope 1.5%.Third and fourth connection is divided to left and right two width, and girder and lower structure are respectively independent.Bridge top knot
Structure uses pre-stressed concrete and consecutive steel structures, and the main pier in lower part uses twin legged thin wall pier, and access bridge transition pier uses hollow pier, and basis is adopted
With pile foundation plus cushion cap form.
Wherein, due to the important component of the guarantee overpass safety of twin legged thin wall pier bracket, the voltage endurance capability test of bracket
It is then particularly important, in the prior art, only bracket is carried out to apply default force value, then observe bracket using level
Deformation values (settlement observation point advance demand flag), make a record.Then load continues 8 hours, inversely unloads step by step to jack
And make a record, measurement observation point height after the completion of unloading calculates bracket elasticity, inelastic deformation value.Firstly, in the prior art
When carrying out precompressed test to bracket, the size deviation that jack is pressed is larger, furthermore, bracket deformation value is observed using level
Accurately the deformation values to bracket to be measured can not continue, accurately observe.
In this regard, it is urgent to provide a kind of twin legged thin wall pier bracket precompressed test macros.
Summary of the invention
Therefore, in order to overcome the above problem, the present invention provides a kind of twin legged thin wall pier bracket precompressed test macro, in utilization
Processing unit, loader, two force snesors, signal processing circuit, image collecting device, image processing module, oil pump is entreated to drive
Dynamic device, display and memory carry out precompressed test to twin legged thin wall pier bracket and use force snesor pair during the test
Hydraulic jack is monitored bracket institute to be measured stress, so that hydraulic jack institute is work to bracket pressure applied to be measured
Make the default force value of personnel institute, that is to say, that input to hydraulic jack according to staff in the present invention using force snesor
Force value, which exerts a force, tests/calibrates, so that and it is higher in the precision for carrying out precompressed to twin legged thin wall pier bracket, furthermore, make
It acquires image information of the bracket to be measured in course of exerting pressure in real time with image collecting device, can not only obtain bracket and be applied
Deformation under fixed force, additionally it is possible to observe the deformation of bracket during force, compared with the prior art test more
Add comprehensively.
Twin legged thin wall pier bracket precompressed test macro provided by the invention includes central processing unit, loader, two power
Sensor, signal processing circuit, image collecting device, image processing module, oil pump driver, display and memory.
Wherein, the input terminal of the output end of loader and central processing unit connects, the output end and signal of force snesor
The input terminal of processing circuit connects, and the output end of image collecting device and the input terminal of image processing module connect, signal processing
The output end of circuit and the output end of image processing module are connect with the input terminal of central processing unit, oil pump driver it is defeated
The input terminal for entering end, the input terminal of display and memory is connect with the output end of central processing unit.
Wherein, two force snesors are used to detect the force signal of two hydraulic jacks, and two hydraulic jacks are set respectively
It sets in the two sides of bracket to be measured, collected force signal is transmitted to signal processing circuit, signal processing circuit pair by force snesor
The force signal received is transmitted to central processing unit after carrying out signal processing, and staff needs to load by loader input
Force value, the force value that staff inputs is transmitted to central processing unit by loader, after central processing unit receives force value
Control oil pump driver starts oil pump so that two hydraulic jacks start to press, until the power letter that central processing unit receives
Number be equal to staff input force value then central processing unit control oil pump driver stop oil pump so that two hydraulic jacks
Top terminates pressure, and image collecting device is set in front of bracket to be measured, for acquiring the image information of bracket to be measured, and will acquisition
To image information be transmitted to image processing module, image processing module passes after carrying out image procossing to the image information received
Central processing unit is transported to, the force signal received and image information are transmitted to display and shown by central processing unit,
The force signal received and image information are transmitted to memory and stored by central processing unit.
Preferably, image collecting device is set in front of bracket to be measured, for acquiring the image information of bracket to be measured, and
Acquired image information is transmitted to image processing module, image processing module includes image filtering unit, image smoothing list
Member and Edge extraction unit, wherein the output end of image collecting device and the input terminal of image filtering unit connect, figure
As the output end of smooth unit is connect with the input terminal of Edge extraction unit, the output end of Edge extraction unit is in
The input terminal connection of processing unit is entreated, it is flat that image processing module successively carries out image filtering, image to the image information received
The processing of sliding and Edge extraction, and image information is transmitted to central processing unit by treated.
It preferably, is two-dimensional function by the bracket image definition to be measured that image collecting device is transmitted to image processing module
F (x, y), wherein x, y are space coordinates, and image filtering unit carries out image filtering processing to image f (x, y), filters by image
Wave treated two-dimensional image function is g (x, y), and wherein G (x, y) is filter function, wherein
。
。
WhereinFor the filtering parameter of above-mentioned filter, filter effect passes throughIt is adjusted.
Preferably, image smoothing unit carries out picture smooth treatment to image g (x, y), after picture smooth treatment
Two-dimensional image function be h (x, y), wherein smooth function be q (x, y),
。
。
Wherein , ﹡ is convolution symbol, and w is customized adjustable constant, and smooth effect is controlled by w.
Preferably, Edge extraction unit carries out Edge extraction to image h (x, y), poor first with part
Operator is divided to find boundary operator to image h (x, y), image h (x, y) is calculated on 2 × 2 neighborhoods to angular derivative:
。
Then thresholding TH is chosen, judges that (i, j) of s (x, y) > TH is step-like marginal point, wherein i ∈ (0, x), j
∈ (0, y), { s (i, j) } are the edge image of image h (x, y).
Preferably, two force snesors are used to detect the force signal of two hydraulic jacks, two hydraulic jacks point
The two sides of bracket to be measured are not set, and collected force signal is transmitted to signal processing circuit, signal processing electricity by force snesor
Road is transmitted to central processing unit after successively carrying out signal amplification and signal filtering processing to the force signal received.
Preferably, two force snesors are used to detect the force signal of two hydraulic jacks, and the force signal of acquisition is turned
It is changed to voltage signal V0, and voltage signal V0 is transmitted to signal processing circuit, V1 is that treated by signal processing circuit
Voltage signal, signal processing circuit include signal amplification unit and signal filter unit, and output end and the signal of force snesor are put
The input terminal of big unit connects, and the output end of signal amplification unit is connect with the input terminal of signal filter unit, and signal filtering is single
The output end of member and the input terminal of central processing unit connect.
Preferably, signal amplification unit includes integrated transporting discharging A1-A3 and resistance R1-R7.
Wherein, the output end of force snesor is connect with the non-inverting input terminal of integrated transporting discharging A1, one end of resistance R1 and integrated
The inverting input terminal of amplifier A1 connects, and the other end of resistance R1 is connect with the output end of integrated transporting discharging A1, one end of resistance R2 and
The inverting input terminal of integrated transporting discharging A2 connects, and the other end of resistance R2 is connect with one end of resistance R1, the same phase of integrated transporting discharging A2
One end of input end grounding, resistance R3 is connect with the output end of integrated transporting discharging A2, the other end of resistance R3 and one end of resistance R2
Connection, one end of resistance R4 are connect with the output end of integrated transporting discharging A1, and one end of resistance R5 and the output end of integrated transporting discharging A2 connect
It connects, the other end of resistance R4 is connect with the inverting input terminal of integrated transporting discharging A3, one end of resistance R5 and the same phase of integrated transporting discharging A3
Input terminal connection, one end of resistance R6 are connect with the other end of resistance R4, the output of the other end and integrated transporting discharging A3 of resistance R6
End connection, one end of resistance R7 are connect with the other end of resistance R5, the other end ground connection of resistance R7, the output end of integrated transporting discharging A3
It is connect with the input terminal of signal filter unit.
Preferably, signal filter unit includes it is characterized in that, signal filter unit includes resistance R8-R14, capacitor
C1-C2 and integrated transporting discharging A4-A6.
Wherein, the output end of signal amplification unit is connect with one end of resistance R8, the other end and integrated transporting discharging of resistance R8
The inverting input terminal of A4 connects, and one end ground connection of resistance R9, the other end of resistance R9 and the non-inverting input terminal of integrated transporting discharging A4 connect
It connecing, one end of resistance R10 is connect with the other end of resistance R8, and the other end of resistance R10 is connect with the output end of integrated transporting discharging A4,
One end of resistance R11 is connect with the other end of resistance R10, and the other end of resistance R11 and the inverting input terminal of integrated transporting discharging A5 connect
It connects, the other end of resistance R11 is also connect with one end of capacitor C1, and the other end of capacitor C1 and the output end of integrated transporting discharging A5 connect
It connects, one end of resistance R12 is connect with the other end of capacitor C1, the other end of resistance R12 and the inverting input terminal of integrated transporting discharging A6
Connection, the non-inverting input terminal ground connection of integrated transporting discharging A6, the other end of resistance R12 are also connect with one end of capacitor C2, capacitor C2's
The other end is connect with the output end of integrated transporting discharging A6, and one end of resistance R13 is connect with one end of resistance R10, and resistance R13's is another
End is connect with the output end of integrated transporting discharging A6, and one end of resistance R14 is connect with the non-inverting input terminal of integrated transporting discharging A4, resistance R14
The other end connect with the output end of integrated transporting discharging A5, the input terminal of the output end of integrated transporting discharging A6 and central processing unit connects
It connects, voltage signal V1 is transmitted to central processing unit by signal filter unit.
Preferably, the force signal that central processing unit receives is equal to the force value that staff inputs, and then central processing fills
It sets control oil pump driver and stops oil pump so that two hydraulic jacks terminate to press, hydraulic jack, which is withstood on, keeps above-mentioned force value pair
Bracket to be measured persistently exerts a force 10 minutes.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) present invention provides a kind of twin legged thin wall pier bracket precompressed test macro, utilizes central processing unit, loader, two
Force snesor, signal processing circuit, image collecting device, image processing module, oil pump driver, display and memory pair
Twin legged thin wall pier bracket carries out precompressed test, during the test, using force snesor to hydraulic jack to bracket institute to be measured
Stress is monitored, so that hydraulic jack is the default force value of staff to bracket pressure applied to be measured, also
It is to say, is exerted a force to hydraulic jack according to the force value that staff inputs/school of testing in the present invention using force snesor
It is quasi-, so that it is higher in the precision for carrying out precompressed to twin legged thin wall pier bracket, furthermore, it is acquired in real time using image collecting device
Image information of the bracket to be measured in course of exerting pressure can not only obtain bracket in the deformation being applied under fixed force, also
It can observe the deformation of bracket during force, compared with the prior art test more comprehensively.
(2) a kind of twin legged thin wall pier bracket precompressed test macro provided by the invention, inventive point of the invention also reside in by
It is undesirable in the signal-to-noise ratio of the signal of force snesor acquisition, thus signal amplification unit passes through integrated transporting discharging A1-A3 and resistance R1-
R7 amplifies processing to the voltage V0 that force snesor exports, the signal amplification being made of integrated transporting discharging A1-A3 and resistance R1-R7
Unit only has the noise of 2.4nV in the drift and the broadband 0.1Hz to 50Hz of 0.1 μ V/ DEG C.Wherein, signal filter unit uses electricity
Resistance R8-R14, capacitor C1-C2 and integrated transporting discharging A4-A6 are filtered to by amplified voltage signal, to mention
The high precision of power detection.
(3) a kind of twin legged thin wall pier bracket precompressed test macro provided by the invention, inventive point of the invention also reside in figure
It is handled as image of the processing module to acquisition successively carries out image filtering, image smoothing and Image Edge-Detection, it can efficiently, quickly
Extraction image collecting device image edge information, can be improved that image is distinguished in precompressed test process to the bracket to be measured
Know precision, efficiently reduces erroneous judgement and happen.
Detailed description of the invention
Fig. 1 is that structure chart is tested in twin legged thin wall pier bracket precompressed of the invention；
Fig. 2 is that entity load divides schematic diagram；
Fig. 3 is the functional diagram of twin legged thin wall pier bracket precompressed test macro of the invention；
Fig. 4 is the functional diagram of image processing module of the invention；
Fig. 5 is the circuit diagram of signal processing circuit of the invention.
Appended drawing reference:
1- central processing unit；2- loader；3- force snesor；4- signal processing circuit；5- image collecting device；At 6- image
Manage module；7- oil pump driver；8- display；9- memory；61- image filtering unit；62- image smoothing unit；63- image
Edge extracting unit.
Specific embodiment
Twin legged thin wall pier bracket precompressed test macro provided by the invention is carried out with reference to the accompanying drawings and examples detailed
Explanation.
As shown in Figure 1-3, twin legged thin wall pier bracket precompressed test macro provided by the invention includes twin legged thin wall pier bracket
Precompressed test macro includes central processing unit 1, loader 2, two force snesors 3, signal processing circuits 4, image collector
Set 5, image processing module 6, oil pump driver 7, display 8 and memory 9.
Wherein, the output end of loader 2 is connect with the input terminal of central processing unit 1, the output end and letter of force snesor 3
The input terminal connection of number processing circuit 3, the output end of image collecting device 5 are connect with the input terminal of image processing module 6, signal
The output end of processing circuit 3 and the output end of image processing module 6 are connect with the input terminal of central processing unit 1, and oil pump drives
The input terminal of the input terminal of dynamic device 7, the input terminal of display 8 and memory 9 connects with the output end of central processing unit 1
It connects.
Wherein, two force snesors 3 are used to detect the force signal of two hydraulic jacks, and two hydraulic jacks are set respectively
It sets in the two sides of bracket to be measured, collected force signal is transmitted to signal processing circuit 4, signal processing circuit 4 by force snesor 3
It is transmitted to central processing unit 1 after carrying out signal processing to the force signal received, staff is needed by the input of loader 2
The force value that staff inputs is transmitted to central processing unit 1 by the force value of load, loader 2, and central processing unit 1 receives
Control oil pump driver 7 starts oil pump so that two hydraulic jacks start to press, until central processing unit 1 receives after force value
The force signal arrived is equal to the force value that staff inputs, and then 1 control oil pump driver 7 of central processing unit stops oil pump so that two
A hydraulic jack terminates to press, and image collecting device 5 is set in front of bracket to be measured, and the image for acquiring bracket to be measured is believed
Breath, and acquired image information is transmitted to image processing module 6, image processing module 6 to the image information received into
Central processing unit 1 is transmitted to after row image procossing, the force signal received and image information are transmitted to by central processing unit
Display 8 is shown that the force signal received and image information are transmitted to memory 9 and stored by central processing unit.
In above embodiment, using central processing unit 1,2, two force snesors 3 of loader, signal processing circuit 4,
Image collecting device 5, image processing module 6, oil pump driver 7, display 8 and memory 9 to twin legged thin wall pier bracket into
Row precompressed test, during the test, is monitored hydraulic jack to bracket institute to be measured stress using force snesor 3, with
Make hydraulic jack institute to the default force value of bracket pressure applied staff institute to be measured, that is to say, that make in the present invention
It is exerted a force to hydraulic jack according to the force value that staff inputs with force snesor 3 and tests/calibrate, so that right
The precision that twin legged thin wall pier bracket carries out precompressed is higher, furthermore, bracket to be measured is acquired in real time using image collecting device 5 is pressing
Image information in the process can not only obtain bracket in the deformation being applied under fixed force, additionally it is possible to observe and apply
Compared with the prior art the deformation of bracket during power is tested more comprehensively.
Staff can observe deformation of the bracket to be measured under staff's pre set force by display 8 in real time.
As shown in figure 4, image collecting device 5 is set in front of bracket to be measured, for acquiring the image information of bracket to be measured,
And acquired image information is transmitted to image processing module 6, image processing module 6 includes image filtering unit 61, image
Smooth unit 62 and Edge extraction unit 63, wherein the output end of image collecting device 5 and image filtering unit 61
Input terminal connection, the output end of image smoothing unit 62 are connect with the input terminal of Edge extraction unit 63, and image border mentions
Take the output end of unit 63 and the input terminal of central processing unit 1 to connect, image processing module 6 to the image information received according to
Secondary progress image filtering, image smoothing and Edge extraction processing, and image information is transmitted to central processing by treated
Device 1.
It specifically, is two-dimensional function by the bracket image definition to be measured that image collecting device 5 is transmitted to image processing module 6
F (x, y), wherein x, y are space coordinates, and image filtering unit 61 carries out image filtering processing to image f (x, y), by image
Two-dimensional image function after filtering processing is g (x, y), and wherein G (x, y) is filter function, wherein
。
。
WhereinFor the filtering parameter of above-mentioned filter, filter effect passes throughIt is adjusted.
Since twin legged thin wall pier bracket precompressed test generally carries out outdoors, and outdoor sunlight is more indoor strong, image
It include high-frequency noise in the image f (x, y) for the bracket that acquisition device 5 acquires, above-mentioned filter function G (x, y) uses low-pass filtering
Method removal image in high-frequency signal, to weaken the high-frequency noise in image f (x, y), above-mentioned filter function G (x, y)
Physical meaning be by the higher partial filtration of brightness in image f (x, y), keep the overall brightness of image more uniform.And its
Filter effect passes throughIt is adjusted, since the outdoor sunlight moment is all changing, pass through adjustment parameterFiltering is imitated
Fruit is adjusted, and can be rapidly achieved makes the more uniform effect of the overall brightness of image.
Specifically, image smoothing unit 62 carries out picture smooth treatment to image g (x, y), after picture smooth treatment
Two-dimensional image function be h (x, y), wherein smooth function be q (x, y),
。
。
Wherein , ﹡ is convolution symbol, and w is customized adjustable constant, and smooth effect is controlled by w.
Specifically, Edge extraction unit 63 carries out Edge extraction to image h (x, y), poor first with part
Operator is divided to find boundary operator to image h (x, y), image h (x, y) is calculated on 2 × 2 neighborhoods to angular derivative:
。
Then thresholding TH is chosen, judges that (i, j) of s (x, y) > TH is step-like marginal point, wherein i ∈ (0, x), j
∈ (0, y), { s (i, j) } are the edge image of image h (x, y).
The edge image of bracket is extracted, staff is enable more intuitively to observe bracket in loading process
Deformation.
As shown in figure 5, two force snesors 3 are used to detect the force signal of two hydraulic jacks, two hydraulic jacks
It is separately positioned on the two sides of bracket to be measured, collected force signal is transmitted to signal processing circuit 4 by force snesor 3, at signal
Reason circuit 4 is transmitted to central processing unit 1 after successively carrying out signal amplification and signal filtering processing to the force signal received.
Specifically, two force snesors 3 are used to detect the force signal of two hydraulic jacks, and the force signal of acquisition is converted
For voltage signal V0, and voltage signal V0 is transmitted to signal processing circuit 4, V1 is that treated by signal processing circuit 4
Voltage signal, signal processing circuit 4 include signal amplification unit and signal filter unit, the output end and signal of force snesor 3
The input terminal of amplifying unit connects, and the output end of signal amplification unit is connect with the input terminal of signal filter unit, signal filtering
The output end of unit is connect with the input terminal of central processing unit 1.
Specifically, signal amplification unit includes integrated transporting discharging A1-A3 and resistance R1-R7.
Wherein, the output end of force snesor 3 is connect with the non-inverting input terminal of integrated transporting discharging A1, one end of resistance R1 and integrated
The inverting input terminal of amplifier A1 connects, and the other end of resistance R1 is connect with the output end of integrated transporting discharging A1, one end of resistance R2 and
The inverting input terminal of integrated transporting discharging A2 connects, and the other end of resistance R2 is connect with one end of resistance R1, the same phase of integrated transporting discharging A2
One end of input end grounding, resistance R3 is connect with the output end of integrated transporting discharging A2, the other end of resistance R3 and one end of resistance R2
Connection, one end of resistance R4 are connect with the output end of integrated transporting discharging A1, and one end of resistance R5 and the output end of integrated transporting discharging A2 connect
It connects, the other end of resistance R4 is connect with the inverting input terminal of integrated transporting discharging A3, one end of resistance R5 and the same phase of integrated transporting discharging A3
Input terminal connection, one end of resistance R6 are connect with the other end of resistance R4, the output of the other end and integrated transporting discharging A3 of resistance R6
End connection, one end of resistance R7 are connect with the other end of resistance R5, the other end ground connection of resistance R7, the output end of integrated transporting discharging A3
It is connect with the input terminal of signal filter unit.
Specifically, signal filter unit includes it is characterized in that, signal filter unit includes resistance R8-R14, capacitor C1-
C2 and integrated transporting discharging A4-A6.
Wherein, the output end of signal amplification unit is connect with one end of resistance R8, the other end and integrated transporting discharging of resistance R8
The inverting input terminal of A4 connects, and one end ground connection of resistance R9, the other end of resistance R9 and the non-inverting input terminal of integrated transporting discharging A4 connect
It connecing, one end of resistance R10 is connect with the other end of resistance R8, and the other end of resistance R10 is connect with the output end of integrated transporting discharging A4,
One end of resistance R11 is connect with the other end of resistance R10, and the other end of resistance R11 and the inverting input terminal of integrated transporting discharging A5 connect
It connects, the other end of resistance R11 is also connect with one end of capacitor C1, and the other end of capacitor C1 and the output end of integrated transporting discharging A5 connect
It connects, one end of resistance R12 is connect with the other end of capacitor C1, the other end of resistance R12 and the inverting input terminal of integrated transporting discharging A6
Connection, the non-inverting input terminal ground connection of integrated transporting discharging A6, the other end of resistance R12 are also connect with one end of capacitor C2, capacitor C2's
The other end is connect with the output end of integrated transporting discharging A6, and one end of resistance R13 is connect with one end of resistance R10, and resistance R13's is another
End is connect with the output end of integrated transporting discharging A6, and one end of resistance R14 is connect with the non-inverting input terminal of integrated transporting discharging A4, resistance R14
The other end connect with the output end of integrated transporting discharging A5, the input terminal of the output end of integrated transporting discharging A6 and central processing unit 1 connects
It connects, voltage signal V1 is transmitted to central processing unit 1 by signal filter unit.
In above embodiment, when carrying out signal processing to 3 signal of force snesor, the model of integrated transporting discharging A1-A6 can
Think LT1367.
LT1367 is binary channels and four-way bipolar operation amplifier, realize rail-to-rail output and input operational capacity with
The combination of accurate specification.Its characteristic can be kept in the power range of a 1.8V to 36V.Input offset voltage is usually
150μV.Representative value of the common mode inhibition in entire rail-to-rail input range is 90dB, and power supply is suppressed to 110dB.LT1367
Using traditional compensation function circuit, it can ensure stability in the case where capacitive load≤1000pF.Improve amplifier
Power supply rejection performance and reduce the output impedance under high frequency condition.
In signal amplification unit, integrated transporting discharging A1 and A2 are the input stage of signal amplification unit, and integrated transporting discharging A3 is signal
The output stage of amplifying unit, wherein R1=R3, R4=R5, R6=R7.It is V0 across the voltage on resistance R2, about according to input current
Beam condition, flowing through resistance R1, R3 and flowing through resistance R2 is the same electric current, then available using Ohm's law:
。
Or:
。
Wherein, the output signal of integrated transporting discharging A1 is V01, and the output signal of integrated transporting discharging A2 is V02.
The output signal V03 of the integrated transporting discharging A3 or output signal V03 of signal amplification unit can then be acquired:
。
It can be obtained in conjunction with above formula:
。
。
Wherein, the overall gain of signal amplification unit is A, the input stage for the signal amplification unit that integrated transporting discharging A1 and A2 are constituted
Gain be A1, the gain of the output stage for the signal amplification unit that integrated transporting discharging A3 is constituted is A2。
In signal amplification unit, integrated transporting discharging A1 and integrated transporting discharging A2 work are in same phase structure, and therefore, their closed loop is defeated
It is very high to enter impedance, equally, integrated transporting discharging A3 has very low output impedance, as long as the value of adjustment resistance R4-R7 appropriate, energy
The CMRR of signal amplification unit is set to reach maximum.
Specifically, the resistance value of resistance R1 is 10K Ω, and the resistance value of resistance R2 is 2.5K Ω, and the resistance value of resistance R3 is 10K Ω,
Resistance R4 is that resistance value is 1K Ω, and resistance R5 is that resistance value is 1K Ω, and resistance R6 is that resistance value is 10K Ω, and resistance R7 is that resistance value is 10K
Ω。
In signal filter unit, the V03 that integrated transporting discharging A4-A6 exports signal amplification unit is overlapped, wherein collection
Output signal at amplifier A4 is V04, and the output signal of integrated transporting discharging A5 is V05:
。
Abbreviation can obtain:
。
Wherein:
。
。
Or:
。
V04 and V05 is substituted into above formula and merges similar terms, can be obtained:
。
The centre frequency of signal filter unit is, filter quality Q.
。
。
In signal filter unit adjustable R8 adjusts R11(or R12 to obtain the response amplitude for needing part) change, the ratio of R14/R9 is adjusted to change Q.
Specifically, resistance R8=R13=R10=1K Ω, resistance R11=R12=10 K Ω, capacitor C1=C2=1 μ F, resistance R9's
Resistance value is 10K Ω, and the resistance value of resistance R14 is 2.5K Ω.
Since the signal-to-noise ratio of the signal of the acquisition of force snesor 3 is undesirable, thus signal amplification unit passes through integrated transporting discharging A1-
The voltage V0 that A3 and resistance R1-R7 exports force snesor 3 amplifies processing, by integrated transporting discharging A1-A3 and resistance R1-R7 structure
At signal amplification unit there was only the noise of 2.4nV in the drift and the broadband 0.1Hz to 50Hz of 0.1 μ V/ DEG C.Wherein, signal is filtered
Wave unit is filtered using resistance R8-R14, capacitor C1-C2 and integrated transporting discharging A4-A6 to by amplified voltage signal
Processing, to improve the precision of power detection.
Specifically, the force signal that central processing unit 1 receives is equal to the force value that staff inputs, and then central processing fills
It sets 1 control oil pump driver 7 and stops oil pump so that two hydraulic jacks terminate to press, hydraulic jack, which is withstood on, keeps above-mentioned force value
It persistently exerts a force 10 minutes to bracket to be measured.
Specifically, central processing unit 1 is STC89C51RC single-chip microcontroller, and display 8 is LCD display unit.
Twin legged thin wall pier bracket precompressed test macro provided by the invention carries out program using STC89C51RC single-chip microcontroller
Execution, data show.STC89C51RC single-chip microcontroller is a kind of semiconductor chip, is low in energy consumption, higher 8 lists of performance
Piece machine.STC89C51RC single-chip microcontroller has 40 pins, 5 interrupt priority levels, 2 layers of interrupt nesting to interrupt.It is by controller and each
The integrated system on a single die of generic module.STC89C51RC is designed and is configured with frequency of oscillation, and can be arranged by software
Battery saving mode.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of twin legged thin wall pier bracket precompressed test macro, which is characterized in that twin legged thin wall pier bracket precompressed test system
System includes central processing unit (1), loader (2), two force snesors (3), signal processing circuit (4), image collecting device
(5), image processing module (6), oil pump driver (7), display (8) and memory (9)；
Wherein, the output end of the loader (2) is connect with the input terminal of the central processing unit (1), the force snesor
(3) output end is connect with the input terminal of the signal processing circuit (3), the output end of described image acquisition device (5) and institute
State the input terminal connection of image processing module (6), the output end and described image processing module of the signal processing circuit (3)
(6) output end is connect with the input terminal of the central processing unit (1), the input terminal of the oil pump driver (7), described
The input terminal of display (8) and the input terminal of the memory (9) connect with the output end of the central processing unit (1)
It connects；
Wherein, two force snesors (3) are used to detect the force signal of two hydraulic jacks, two hydraulic jacks
The two sides of bracket to be measured are separately positioned on, collected force signal is transmitted to the signal processing electricity by the force snesor (3)
Road (4), the signal processing circuit (4) are transmitted to the central processing unit after carrying out signal processing to the force signal received
(1), staff needs force value to be loaded by the loader (2) input, what the loader (2) inputted staff
Force value is transmitted to the central processing unit (1), and the central processing unit (1) controls the oil pump driving after receiving force value
Device (7) starts oil pump so that two hydraulic jacks start to press, until the force signal that the central processing unit (1) receives
Equal to staff's input force value then the central processing unit (1) control the oil pump driver (7) stop oil pump so that
Two hydraulic jacks terminate to press, and described image acquisition device (5) is set in front of the bracket to be measured, described for acquiring
The image information of bracket to be measured, and acquired image information is transmitted to described image processing module (6), described image processing
Module (6) is transmitted to the central processing unit (1), the central processing after carrying out image procossing to the image information received
The force signal received and image information are transmitted to the display (8) and shown by device, and the central processing unit will
The force signal and image information received is transmitted to the memory (9) and is stored.
2. twin legged thin wall pier bracket precompressed test macro according to claim 1, which is characterized in that described image acquisition dress
It sets (5) to be set in front of the bracket to be measured, for acquiring the image information of the bracket to be measured, and acquired image be believed
Breath is transmitted to described image processing module (6), and described image processing module (6) includes image filtering unit (61), image smoothing
Unit (62) and Edge extraction unit (63), wherein the output end and described image of described image acquisition device (5) are filtered
The input terminal of wave unit (61) connects, the output end and described image edge extracting unit (63) of described image smooth unit (62)
Input terminal connection, the input terminal of the output end of described image edge extracting unit (63) and the central processing unit (1) connects
It connects, described image processing module (6) successively carries out image filtering, image smoothing and image border to the image information received and mentions
Processing is taken, and image information is transmitted to the central processing unit (1) by treated.
3. twin legged thin wall pier bracket precompressed test macro according to claim 2, which is characterized in that acquire described image
The bracket image definition to be measured that device (5) is transmitted to described image processing module (6) is two-dimensional function f (x, y), wherein
X, y is space coordinate, and described image filter unit (61) carries out image filtering processing to image f (x, y), at image filtering
Two-dimensional image function after reason is g (x, y), and wherein G (x, y) is filter function, wherein
；
；
WhereinFor the filtering parameter of above-mentioned filter, filter effect passes throughIt is adjusted.
4. twin legged thin wall pier bracket precompressed test macro according to claim 3, which is characterized in that described image is smooth
Unit (62) carries out picture smooth treatment to image g (x, y), two-dimensional image function after picture smooth treatment be h (x,
Y), wherein smooth function is q (x, y),
；
；
Wherein , ﹡ is convolution symbol, and w is customized adjustable constant, and smooth effect is controlled by w.
5. twin legged thin wall pier bracket precompressed test macro according to claim 4, which is characterized in that described image edge mentions
It takes unit (63) to carry out Edge extraction to image h (x, y), side is found to image h (x, y) first with local difference operator
Edge operator, image h (x, y) are calculated on 2 × 2 neighborhoods to angular derivative:
；
Then thresholding TH is chosen, judges that (i, j) of s (x, y) > TH is step-like marginal point, wherein i ∈ (0, x), j ∈ (0,
Y), { s (i, j) } is the edge image of image h (x, y).
6. twin legged thin wall pier bracket precompressed test macro according to claim 1, which is characterized in that described two power
Sensor (3) is used to detect the force signal of two hydraulic jacks, and two hydraulic jacks are separately positioned on bracket to be measured
Two sides, collected force signal is transmitted to the signal processing circuit (4), the signal processing by the force snesor (3)
Circuit (4) is transmitted to the central processing unit after successively carrying out signal amplification and signal filtering processing to the force signal received
(1).
7. twin legged thin wall pier bracket precompressed test macro according to claim 6, which is characterized in that described two power
Sensor (3) is used to detect the force signal of two hydraulic jacks, the force signal of acquisition is converted to voltage signal V0, and will be electric
Pressure signal V0 is transmitted to the signal processing circuit (4), and V1 is by the signal processing circuit (4) treated voltage letter
Number, the signal processing circuit (4) includes signal amplification unit and signal filter unit, the output end of the force snesor (3)
It is connect with the input terminal of the signal amplification unit, the output end of the signal amplification unit is defeated with the signal filter unit
Enter end connection, the output end of the signal filter unit is connect with the input terminal of the central processing unit (1).
8. twin legged thin wall pier bracket precompressed test macro according to claim 7, which is characterized in that the signal amplification is single
Member includes integrated transporting discharging A1-A3 and resistance R1-R7；
Wherein, the output end of the force snesor (3) is connect with the non-inverting input terminal of integrated transporting discharging A1, one end of resistance R1 and collection
It is connected at the inverting input terminal of amplifier A1, the other end of resistance R1 is connect with the output end of integrated transporting discharging A1, one end of resistance R2
It is connect with the inverting input terminal of integrated transporting discharging A2, the other end of resistance R2 is connect with one end of resistance R1, and integrated transporting discharging A2's is same
One end of phase input end grounding, resistance R3 is connect with the output end of integrated transporting discharging A2, the other end of resistance R3 and the one of resistance R2
End connection, one end of resistance R4 are connect with the output end of integrated transporting discharging A1, one end of resistance R5 and the output end of integrated transporting discharging A2
Connection, the other end of resistance R4 connect with the inverting input terminal of integrated transporting discharging A3, and one end of resistance R5 is same with integrated transporting discharging A3's
The connection of phase input terminal, one end of resistance R6 connect with the other end of resistance R4, and the other end of resistance R6 is defeated with integrated transporting discharging A3's
Outlet connection, one end of resistance R7 are connect with the other end of resistance R5, the other end ground connection of resistance R7, the output of integrated transporting discharging A3
End is connect with the input terminal of the signal filter unit.
9. twin legged thin wall pier bracket precompressed test macro according to claim 8, which is characterized in that the signal filtering is single
Member includes it is characterized in that, the signal filter unit includes resistance R8-R14, capacitor C1-C2 and integrated transporting discharging A4-A6；
Wherein, the output end of the signal amplification unit is connect with one end of resistance R8, the other end and integrated transporting discharging of resistance R8
The inverting input terminal of A4 connects, and one end ground connection of resistance R9, the other end of resistance R9 and the non-inverting input terminal of integrated transporting discharging A4 connect
It connecing, one end of resistance R10 is connect with the other end of resistance R8, and the other end of resistance R10 is connect with the output end of integrated transporting discharging A4,
One end of resistance R11 is connect with the other end of resistance R10, and the other end of resistance R11 and the inverting input terminal of integrated transporting discharging A5 connect
It connects, the other end of resistance R11 is also connect with one end of capacitor C1, and the other end of capacitor C1 and the output end of integrated transporting discharging A5 connect
It connects, one end of resistance R12 is connect with the other end of capacitor C1, the other end of resistance R12 and the inverting input terminal of integrated transporting discharging A6
Connection, the non-inverting input terminal ground connection of integrated transporting discharging A6, the other end of resistance R12 are also connect with one end of capacitor C2, capacitor C2's
The other end is connect with the output end of integrated transporting discharging A6, and one end of resistance R13 is connect with one end of resistance R10, and resistance R13's is another
End is connect with the output end of integrated transporting discharging A6, and one end of resistance R14 is connect with the non-inverting input terminal of integrated transporting discharging A4, resistance R14
The other end connect with the output end of integrated transporting discharging A5, the output end of integrated transporting discharging A6 is defeated with the central processing unit (1)
Enter end connection, voltage signal V1 is transmitted to the central processing unit (1) by the signal filter unit.
10. twin legged thin wall pier bracket precompressed test macro according to claim 1, which is characterized in that the central processing
The force signal that device (1) receives is equal to the force value that staff inputs, and then the central processing unit (1) controls the oil pump
Driver (7) stops oil pump so that two hydraulic jacks terminate to press, and the hydraulic jack, which is withstood on, keeps above-mentioned force value to treat
Bracket is surveyed persistently to exert a force 10 minutes.
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