CN104196065A - Wireless intelligent high strain sensor and wireless intelligent high strain detection method - Google Patents
Wireless intelligent high strain sensor and wireless intelligent high strain detection method Download PDFInfo
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- CN104196065A CN104196065A CN201410505463.3A CN201410505463A CN104196065A CN 104196065 A CN104196065 A CN 104196065A CN 201410505463 A CN201410505463 A CN 201410505463A CN 104196065 A CN104196065 A CN 104196065A
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Abstract
The invention provides a wireless intelligent high strain sensor and a wireless intelligent high strain detection method. The wireless intelligent high strain sensor comprises a sensing driving circuit, a sensitive element, an operational amplifier, a high-pass filtering circuit, a low-pass filtering circuit, an AD converter and a CortexM3 single-chip microcomputer which are connected in sequence, as well as a CPLD connected with the AD converter and the CortexM3 single-chip microcomputer, a synchronous triggering circuit connected with the CPLD, and a radio-frequency transceiver circuit connected with the CortexM3 single-chip microcomputer; after an upper computer sets a triggering threshold value and sampling length through the radio-frequency transceiver circuit, when the data output by the AD converter reaches to the set triggering threshold value, the set sampling length of the collected data is stored by the sensor, and is transmitted to the upper computer through the radio-frequency transceiver circuit. The method comprises the steps of mounting the sensor, initializing current hammer parameters, setting the sampling length in a wireless manner, setting the triggering threshold value in a wireless manner; waiting for hammer dropping; diagnosing triggering, recording data and transmitting the data in a wireless manner.
Description
Technical field
The present invention relates to a kind of foundation pile detecting sensor and corresponding method of detection, more specifically relate to a kind of intelligent high strain transducer and corresponding high strain detecting method, belong to geotechnical engineering detection field.
Background technology
It is a kind of conventional method that detects foundation pile single pile vertical resistance pressure, bearing capacity and pile body integrity in geotechnical engineering field that foundation pile high stress detects, its general principle is with weight axial impact stake top, make to produce enough relative displacements between stake and soil, fully to excite all soil resistances of stake and stake end bearing power, make stake produce enough pile penetrations, survey the response of consequent pile body particle stress and acceleration, analyze by wave theory, judge thus single pile vertical resistance pressure, bearing capacity and the pile body integrity of foundation pile.This stress parameters and acceleration parameter adopt respectively power sensor and acceleration transducer collection, conventionally must be respectively two power sensors and two acceleration transducer symmetries are arranged on and are treated near peg top.
Fig. 1 is the high strain-Sensing device schematic diagram of prior art.As shown in Figure 1, cylinder is foundation pile to be measured, and a set of complete high strain-Sensing device of prior art comprises No. 2 acceleration transducer 10 and 20,2 tunnel power sensors 30 and 40, high strain main frame 6 and host computer 7.For example, wherein acceleration transducer 10,20 can adopt LC0157IC piezoelectric accelerometer, power sensor 30,40 can adopt CYB-YB-F1kA (D) type strain gauge sensors, the foundation pile movable measurement instrument RS-1616K (S) that high strain main frame 6 can adopt Wuhan Yanhai Engineering Tech. Co., Ltd. to produce, host computer 7 can adopt general PC or panel computer.No. 2 acceleration transducer 10,20 and 2 tunnel power sensors 30,40 are arranged on the surrounded surface of certain horizontal section for the treatment of peg, acceleration transducer 10 is symmetry shape with acceleration transducer 20, power sensor 30 is symmetry shape with power sensor 40, and the output of each sensor is connected with high strain main frame 6 by the large cable of a Gent system.While carrying out high strain-gauge test, the moment under weight is pounded, treat that peg produces particle stress and acceleration, high strain main frame 6 is counted and is interiorly recorded transient strain, the acceleration information that each sensor gathers and preserve at the time range of setting and record.Test completely, derived and pass to host computer 7 being kept at image data in high strain main frame 6 by USB flash disk, single pile vertical resistance pressure, bearing capacity and the pile body integrity of the high strain analysis software by specialty in host computer 7 to foundation pile to be measured analyzed.In prior art, sensor 10,20,30,40 adopts special large cable to be connected with high strain main frame 6, there is following defect: first, due to high strain-gauge test site operation environment more complicated, special large cable is easily damaged in test, work progress.The second, because the stress signal producing in hammering pile body process to be measured is very little, this signal during by longer cable transmission than being easier to by environmental disturbances around, thereby cause arriving the non-constant of stress signal of high strain main frame 6.The 3rd, fixing cable connector can only be connected and fixed the sensor of quantity, can cause calculating being forbidden in the time that weight hits partially, cannot carry out average error by extra increase placement sensor.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of safety, signal stabilization and high strain-Sensing device and corresponding high strain detecting method easy for installation of using.For overcoming the above problems, the invention provides the high strain transducer of a kind of intelligent wireless, the high strain detecting system of a kind of intelligent wireless based on the high strain transducer of this intelligent wireless, and a kind of high strain detecting method based on the high strain transducer of this intelligent wireless.
The high strain transducer of intelligent wireless of the present invention comprises intelligent wireless acceleration transducer and intelligent wireless power sensor, both structures are similar, substantially comprise sensing drive circuit, sensing element, operational amplifier, high-pass filtering circuit, low-pass filter circuit, AD converter, synchronous trigger circuit, CPLD, Cortex M3 single-chip microcomputer, RF transmit-receive circuit, wherein sensing drive circuit, sensing element, operational amplifier, high-pass filtering circuit, low-pass filter circuit, AD converter is connected successively, sensing element also successively with synchronous trigger circuit, CPLD is connected, CPLD and AD converter, Cortex M3 single-chip microcomputer is connected, AD converter is connected with Cortex M3 single-chip microcomputer, Cortex M3 single-chip microcomputer is connected with RF transmit-receive circuit.Sensor triggers based on tension weight churning power, in the time that the output of sensor reaches activation threshold value, automatic synchronization triggers, by gather acceleration information or stress data set time span and sampling number (being sampling length) scope in preservation, directly by wireless way for transmitting to host computer.
Wherein, the sensing drive circuit of intelligent wireless acceleration transducer is constant-current source circuit, and sensing element is piezoelectric type acceleration sensing element; The sensing drive circuit of intelligent wireless power sensor is Huygens's electric bridge, and sensing element is resistance strain plate.
Wireless high strain detecting method of the present invention adopts the automatic synchronization triggering mode based on tension weight churning power, and step is: determine detecting pattern; Sensor installation; Start sensor; Initialize current hammer parameter; Sampling length is set; Activation threshold value is set; Wait is dropped hammer; Judgement triggers; Enable to trigger, record triggers address; Record data; Transmission data.
The invention has the beneficial effects as follows: the special large cable constraint of having abandoned connecting sensor and high strain main frame in prior art, even no longer need traditional high strain main frame, use safety, signal stabilization, and easy for installation, the laying of sensor, adjustment, dismounting are very flexible, have greatly improved high strain detecting efficiency, have reduced testing staff's working strength.
Brief description of the drawings
The high strain-Sensing device schematic diagram of Fig. 1---prior art.
Fig. 2---the high strain transducer of a kind of intelligent wireless of the present invention uses schematic diagram.
Fig. 3---one of them embodiment of the high strain transducer of intelligent wireless of the present invention, i.e. the circuit structure schematic block diagram of acceleration transducer.
Fig. 4---another embodiment of the high strain transducer of intelligent wireless of the present invention, i.e. the circuit structure schematic block diagram of power sensor.
Fig. 5---the circuit diagram of one of them embodiment of the high-pass filtering circuit 14 shown in the high strain acceleration transducer of intelligent wireless of the present invention shown in Fig. 3 and Fig. 4 in the high adaptability to changes sensor of intelligent wireless of the present invention.
Fig. 6---the circuit diagram of one of them embodiment of the low-pass filter circuit 16 shown in the high strain acceleration transducer of intelligent wireless of the present invention shown in Fig. 3 and Fig. 4 in the high adaptability to changes sensor of intelligent wireless of the present invention.
Fig. 7---the circuit structure schematic block diagram of one of them embodiment of the synchronous trigger circuit 18 shown in the high strain acceleration transducer of intelligent wireless of the present invention shown in Fig. 3 and Fig. 4 in the high adaptability to changes sensor of intelligent wireless of the present invention.
Fig. 8---the implementing circuit figure of the absolute value circuit 25 shown in Fig. 7 in synchronous trigger circuit 18 of the present invention.
Fig. 9---the implementing circuit figure of the bleeder circuit 27 shown in Fig. 7 in synchronous trigger circuit 18 of the present invention.
Figure 10---the implementing circuit figure of the voltage comparator circuit 29 shown in Fig. 7 in synchronous trigger circuit 18 of the present invention.
Figure 11---wireless high strain detecting method flow diagram of the present invention.
In figure: 10---first via acceleration transducer; 20---No. second acceleration transducer; 30---first via power sensor; 40---the second tunnel power sensor; 6---high strain main frame; 7---host computer; 1---the high strain acceleration transducer of first via intelligent wireless; 2---the high strain acceleration transducer of the second road intelligent wireless; 3---the high adaptability to changes sensor of first via intelligent wireless; 4---the high adaptability to changes sensor of the second road intelligent wireless; 11---constant-current source circuit (LM317); 12---piezoelectric acceleration sensing element (HK9101-J); 13---operational amplifier (INA128); 14---high-pass filtering circuit (OPA227); 16---low-pass filter circuit (LTC1065); 17---AD converter (ADS1278); 18---synchronous trigger circuit; 31---CPLD; 19---Cortex M3 single-chip microcomputer (STM32F103VG); 21---RF transmit-receive circuit (Si4432); 22---Huygens's electric bridge; 23---resistance strain plate (CF350-3FB); 24---differential amplifier; 25---absolute value circuit; 27---bleeder circuit; 29---voltage comparator circuit; 26---operational amplifier (LF353DR); 28A/28B/28C---operational amplifier (LF347BDR); 32,42,34,36---switching diode (IN4148);---switching diode (IN4148); 38---electronic switch (CD4051); 44---reference voltage (REF3025); A---determine detecting pattern; B---sensor installation; C---start sensor; D---initialize current hammer parameter; E---sampling length is set; F---activation threshold value is set; G---wait for and dropping hammer; H---judgement triggers; I---enable to trigger, record triggers address; J---record data; K---transmission data.
Detailed description of the invention
Below in conjunction with accompanying drawing and preferred embodiment, the present invention is further elaborated.
Refer to Fig. 2, for the high strain transducer of a kind of intelligent wireless of the present invention uses schematic diagram.As shown in Figure 2, the high strain transducer of intelligent wireless of the present invention comprises the high strain acceleration transducer of intelligent wireless (hereinafter to be referred as acceleration transducer) 1, the high strain acceleration transducer 2 of intelligent wireless, the high adaptability to changes sensor of intelligent wireless (hereinafter to be referred as power sensor) 3, the high adaptability to changes sensor 4 of intelligent wireless.Four sensors are arranged on respectively and are not less than 2 times of stake side surface places that treat peg diameter or the distance that broadens apart from stake top, and acceleration transducer 1 is arranged on same diameter with acceleration transducer 2 symmetries, and power sensor 3 is arranged on same diameter with power sensor 4 symmetries.When conditions permit, should try one's best and down install.For large diameter pile, the distance between sensor and stake top can suitably reduce, but can not be less than 1 times treats peg diameter or the distance that broadens.The material size of the material at sensor installation place and section should be identical with former pile body, and sensor must not be arranged near abrupt change of cross-section place.The center of each sensor should be positioned at the same level vertical with foundation pile axis to be measured, the acceleration transducer of homonymy 1 and power sensor 3, and horizontal range between acceleration transducer 2 and power sensor 4 should not be greater than 80mm, is generally 60-80mm.The central axis of each sensor should with pile center to be measured axle keeping parallelism, the mounting plane of each sensor should with treat that peg axis is parallel.Mounting plane material should be even, closely knit, smooth, otherwise will adopt sanding machine that surface finish is flat.The boring of each installation of sensors bolt should with treat that peg side surface is vertical.The erection bolt line of power sensor 3, power sensor 4 should be with pile center to be measured axle keeping parallelism and perpendicular to ground line.Each sensor after installing should be close to pile body to be measured surface, when hammering, must not produce slip.And need monitor the initial strain value of power sensor 3, power sensor 4.
The high strain acceleration transducer 1,2 of intelligent wireless and the high adaptability to changes sensor the 3, the 4th of intelligent wireless, respectively independently, be arranged in the same level of foundation pile to be measured.The moment on peg top is treated in the test requirements document of high strain detection of dynamic in weight hammering, must collect the data that pile body surface acceleration and pile body surface stress change simultaneously, therefore these four the high strain transducer of intelligent wireless inside are provided with synchronous trigger circuit, ensure that these four sensors can synchronously trigger, and determine some writing time.While carrying out high strain detection of dynamic test, normal startup after four high strain transducers of intelligent wireless, must connect the Radio Link between each sensor in the host computer 7 ends configurations with radio communication function, synchronous activation threshold value, the writing time length and record sampling number of each sensor is set.Treat that weight hammering treats peg top, the high strain acceleration transducer 1,2 of intelligent wireless detects the hammering dynamics of weight in real time, under default hammering dynamics, produce and trigger, start to record the acceleration information on pile body surface from the moment of triggering, until preset recording time span and record sampling number and finish.Simultaneously, the stress situation of high adaptability to changes sensor 3, the 4 dynamic monitoring pile bodies of intelligent wireless, under default triggering grade, is produced and is triggered by the hammering of weight, start to record the stress data on pile body surface from triggering the moment, until default writing time length and the sampling number of record finish.After having recorded, host computer 7 sends and obtains data command, receives after instruction, and each sensor sends to host computer 7 by wireless by record data, and host computer 7 can be stored and analyze data.
Referring to Fig. 3, is one of them embodiment of the high strain transducer of a kind of intelligent wireless of the present invention, shown in Fig. 2, uses the structural representation of the high strain acceleration transducer 1,2 of intelligent wireless in schematic diagram.As shown in Figure 3, the high strain acceleration transducer 1 of intelligent wireless of the present invention comprises constant-current source circuit 11, piezoelectric type acceleration sensing element 12, operational amplifier 13, high-pass filtering circuit 14, low-pass filter circuit 16, A/D converter 17, synchronous trigger circuit 18, CPLD31, Cortex M3 single-chip microcomputer 19, RF transmit-receive circuit 21.Constant-current source circuit 11 is sensing drive circuit, be connected with piezoelectric type acceleration sensing element 12, piezoelectric type acceleration sensing element 12 outputs are connected with synchronous trigger circuit 18 and operational amplifier 13, synchronous trigger circuit 18 is connected with CPLD31, operational amplifier 13 outputs successively with high-pass filtering circuit 14, low-pass filter circuit 16, A/D converter 17 is connected, A/D converter 17 outputs are connected with Cortex M3 single-chip microcomputer 19, simultaneously CPLD31 also with A/D converter 17, Cortex M3 single-chip microcomputer 19 is connected, Cortex M3 single-chip microcomputer 19 is connected with RF transmit-receive circuit 21.
In the present embodiment, constant-current source circuit 11 adopts the power supply chip LM317 of TIX to form.2 pin of LM317 are connected with 4 pin, between 1 pin and 4 pin, are connected in series the resistance of 312 ohm, and 3 pin connect the voltage source of 24V, the constant-current supply of output 4.2mA, and its direct current biasing is 24V, drives piezoelectric type acceleration sensing element 12.
The HK9101-J type piezoelectric acceleration transducer that piezoelectric type acceleration sensing element 12 adopts Qinhuangdao, Qinhuangdao, Hebei Heng Ke Science and Technology Ltd. to produce, sensitivity ~ 35pC/g, measurement category-100g ~+100g, frequency range 0.2 ~ 8000Hz, fixing resonance frequency 28kHz in the fixing situation of steel bolt, maximum transversal remolding sensitivity <5%.The signal that piezoelectric type acceleration sensing element 12 is exported is concatenation operation amplifier 13 and synchronous trigger circuit 18 simultaneously.
Operational amplifier 13 adopts two voltage amplification chip I NA128(not shown), small-signal is carried out to two-stage amplification, and adopt capacitance coupling circuit at inter-stage, to obtain good amplification effect.The resistance of 1, the 8 pin cross-over connections of voltage amplification chip I NA128 is used for adjusting enlargement ratio; 4,7 pin provide positive and negative equal operating voltage; 2, the voltage that the input of 3 pin will be amplified; Voltage after 6 pin outputs are amplified; 5 pin are reference datas, direct ground connection in the present embodiment, and the output voltage of 6 pin is the relative voltage between ground thus.
In the present embodiment, the effect of high-pass filtering circuit 14 is that the interference that exchanges that suppresses DC component and 50HZ impacts the signal of AD converter 17 input front ends.High-pass filtering circuit 14 is designed to 4 rank Butterworth filters, and filtering cut-off frequency is 80HZ, adopts Sallen-Key filter construction, gains as 0DB, and passband ripple coefficient is 1DB.Referring to Fig. 5, is the circuit diagram of one of them embodiment of high-pass filtering circuit 14.High-pass filtering circuit 14 is made up of the precision operational-amplifier OPA227 of TIX.First order high-pass filtering, the capacitor C 1 of two 1.08uF, the in-phase input end that C2 connects precision operational-amplifier OPA227; The feedback resistance R2 of cross-over connection 1.7k Ω between the output of precision operational-amplifier OPA227 and in-phase input end; The in-phase input end of precision operational-amplifier OPA227 connects the resistance R 1 of 1.99k Ω over the ground; The output of precision operational-amplifier OPA227 connects the negative-feedback of inverting input formation and ensures that circuit working is stable.2 grades of high-pass filterings possess identical structure, second level high-pass filtering, and the output of the first order is by the capacitor C 3 of two 2.61uF, the in-phase input end that C4 connects precision operational-amplifier OPA227; The feedback resistance R4 of cross-over connection 291.3 Ω between the output of precision operational-amplifier OPA227 and in-phase input end; The in-phase input end of precision operational-amplifier OPA227 connects the resistance R 3 of 1.99k Ω over the ground; The output of precision operational-amplifier OPA227 connects the negative-feedback of inverting input formation and ensures that circuit working is stable.
Low-pass filter circuit 16 adopts the adjustable switched capacitor low pass filter of cut-off frequency, adopts the integrating filtering chip LTC1065 of Linear Techn Inc. of the U.S. to realize.Referring to Fig. 6, is the circuit diagram structure schematic diagram of one of them embodiment of low-pass filter circuit 16.As shown in Figure 6,3 pin of integrating filtering chip LTC1064 meet power supply-5V, 6 pin meet power supply+5V, the signal of exporting through high-pass filtering circuit 14 connects 1 pin through input buffer resistance RIN, 5 pin provide clock to determine cut-off frequency by synchronous trigger circuit 18, and cut-off frequency can be arranged by Cortex M3 single-chip microcomputer 19.
AD converter 17 adopts 24 bit synchronization sampling A/D chip ADS1278 of TIX to realize (not shown).Sample rate is set to 144kHz, and the signal of exporting with low-pass filter circuit 16 through high-pass filtering circuit 14 is connected 1,2,3,4 pin of synchronized sampling chip ADS1278, samples by 2 different passages simultaneously.10 pin of synchronized sampling chip ADS1278 provide clock to drive by synchronous trigger circuit 18,11 pin are that the synchronous pin of synchronous trigger circuit 18 connects, 6 pin ground connection, 5 pin meet analog power+5V, 20 pin, 19 pin provide the data output of serial, connect the data input pin of CPLD31, read 24 translation data of synchronized sampling chip ADS1278 output for CPLD31.
The signal that piezoelectric type acceleration sensing element 12 is exported connects synchronous trigger circuit 18 simultaneously, synchronous trigger circuit 18 produces triggering signal and outputs to CPLD31, CPLD31 turns by the wheel of the acquisition state of this triggering signal control control AD converter 17, and the data of collection are exported to Cortex M3 single-chip microcomputer 19 by bus.In the present embodiment, CPLD31 adopts the EPM1270 CPLD of U.S. ALTERA company to realize, by bus and AD converter 17(synchronized sampling chip ADS1278) data wire be connected, be connected with the bus of Cortex M3 single-chip microcomputer 19 by bus simultaneously.
The electrical block diagram of one of them embodiment of synchronous trigger circuit 18 refers to Fig. 7.As shown in Figure 7, synchronous trigger circuit 18 comprises absolute value circuit 25, bleeder circuit 27, voltage comparator circuit 29.The output signal of piezoelectric type acceleration sensing element 12 connects the input of absolute value circuit 25.When weight hammering is in the time that peg pushes up, the acceleration pulse of generation or strain-pulse convert direct impulse to after absolute value circuit 25.Hammering dynamics is larger, and the amplitude of direct impulse is larger.The average voltage refinement of+5V is divided into 10 grades by bleeder circuit 27, and the voltage difference of each grade is 0.5V.The output of absolute value circuit 25, bleeder circuit 27 connects voltage comparator circuit 29.Voltage comparator circuit 29 compares the reference voltage amplitude of the pulse voltage of absolute value and each grade, and pulse voltage amplitude is output as height during higher than comparison reference voltage, when pulse voltage amplitude is output as during lower than comparison reference voltage low.The output of voltage comparator circuit 29 converts start pulse signal to CPLD31 after level shifting circuit.Wherein the detailed circuit structural representation of absolute value circuit 25, bleeder circuit 27, voltage comparator circuit 29 is respectively as shown in Fig. 8, Fig. 9, Figure 10.
As shown in Figure 8, absolute value circuit 25 is made up of operational amplifier 26A, operational amplifier 26B, operational amplifier 28D, switching diode 42, switching diode 32.Operational amplifier 26A, operational amplifier 26B adopt the two-way operational amplifier LF353DR of ADI company of the same U.S. to form, switching diode 42,32 adopt general IN4148, operational amplifier 28D adopt the U.S. Si of ADI company road operational amplifier LF347BDR one of them, share with the operational amplifier 28C in operational amplifier 28B, voltage comparator circuit 29 in bleeder circuit 27.As shown in Figure 9, bleeder circuit 27 is made up of reference voltage 44, electronic switch 38, operational amplifier 28B.Wherein, reference voltage 44 adopts the 2.5V reference voltage REF3025 of American TI Company, electronic switch 38 adopts the digital control electronic switch CD4051 of list 8 passage of American TI Company, and the operational amplifier 28C in operational amplifier 28D, voltage comparator circuit 29 in operational amplifier 28B and absolute value circuit 25 shares the U.S. Si of ADI company road operational amplifier LF347BDR.As shown in figure 10, voltage comparator circuit 29 is made up of operational amplifier 28C and switching diode 34,36, operational amplifier 28B in operational amplifier 28D, bleeder circuit 27 in operational amplifier 28C and absolute value circuit 25 shares the U.S. Si of ADI company road operational amplifier LF347BDR, and switching diode 34,36 adopts general IN4148.
Get back to Fig. 3, Cortex M3 single-chip microcomputer 19 is control cores of sensor of the present invention, adopts the STM32F103VG of ST Microelectronics to realize.STM32F103VG is by FSMC bus and synchronous trigger circuit 18(EPM1270) be connected, read the data that AD converter 17 that synchronous trigger circuit 18 obtains is exported, and connect RF transmit-receive circuit 21 by USART interface and obtain the parameters that host computer 7 sends over and send to host computer 7 data that collect.The triggering grade judgement that Cortex M3 single-chip microcomputer 19 is exported according to synchronous trigger circuit 18 triggers the moment, the point of some after triggering is kept in internal storage, and is sent to host computer 7.
RF transmit-receive circuit 21 is used for and host computer 7 communications, adopts the low-power consumption multiband radio transceiver chip Si4432 of Silicon Labs company to realize, and sets the free frequency range that is operated in 433MHz.The USART interface of rf chip Si4432 is connected with the USART1 interface of Cortex M3 single-chip microcomputer 19, and baud rate is configured to 115200.Rf chip Si4432 improves gain by external antenna, improves receiving sensitivity.
Referring to Fig. 4, is one of them embodiment of the high strain transducer of a kind of intelligent wireless of the present invention, shown in Fig. 2, uses the structural representation of the high adaptability to changes sensor 3,4 of intelligent wireless in schematic diagram.As shown in Figure 4, the high adaptability to changes sensor of intelligent wireless of the present invention comprises adjustable balancing electric bridge 22, strain data Acquisition Circuit, synchronous trigger circuit 18, Cortex M3 single-chip microcomputer 19, RF transmit-receive circuit 21.Adjustable balancing electric bridge 22 is connected with strain data Acquisition Circuit, and strain data Acquisition Circuit output is connected with Cortex M3 single-chip microcomputer 19, and Cortex M3 single-chip microcomputer 19 is connected with synchronous trigger circuit 18, RF transmit-receive circuit 21.Wherein strain data Acquisition Circuit comprises connected successively resistance strain plate 23, differential amplifier 24, high-pass filtering circuit 14, low-pass filter circuit 16, A/D converter 17.With reference to the high strain acceleration transducer of the intelligent wireless shown in Fig. 3, the high strain acceleration sensor structure of intelligent wireless shown in the high adaptability to changes sensor of known intelligent wireless of the present invention and Fig. 3 is similar.The constant-current source circuit 11 in high the intelligent wireless shown in Fig. 3 strain acceleration transducer is replaced with Huygens's electric bridge 22 by the high adaptability to changes sensor of intelligent wireless of the present invention, as sensing drive circuit, the piezoelectric type acceleration sensing element 12 in high the intelligent wireless shown in Fig. 3 strain acceleration transducer is replaced with to resistance strain plate 23.Wherein, Huygens's electric bridge 22 is adjustable balancing electric bridge, adopts a resistance strain gage and 3 High Precision Low Temperatures to float resistance and forms, the CF350-3FB resistance strain plate that resistance strain plate 23 adopts Xiamen Nuo Sheng observation and control technology Co., Ltd to provide.Connected mode between embodiment and these devices of differential amplifier 24, high-pass filtering circuit 14, low-pass filter circuit 16, A/D converter 17, synchronous trigger circuit 18, Cortex M3 single-chip microcomputer 19, RF transmit-receive circuit 21 and corresponding device in the high strain acceleration transducer of the intelligent wireless shown in Fig. 3 is identical, does not repeat again at this.
Referring to Figure 11, is the flow chart of a kind of wireless high strain detecting method of the present invention, and this method is the detection method supporting with the high strain transducer of above-described a kind of intelligent wireless.As shown in figure 11, this method is carried out according to the following steps:
A, determine detecting pattern.Detecting pattern comprises monitoring mode and drainage pattern, and monitoring mode is sampled data, and not save data is only seen the duty when front sensor.Sampling configuration is save data, and follow-up analysis is provided.Here be set to drainage pattern, but not monitoring mode.
B, sensor installation.Refer to Fig. 2 and describe above, the device that wireless high strain detecting method of the present invention needs comprises the high strain acceleration transducer of intelligent wireless (hereinafter to be referred as acceleration transducer) 1, the high strain acceleration transducer 2 of intelligent wireless, the high adaptability to changes sensor of intelligent wireless (hereinafter to be referred as power sensor) 3, the high adaptability to changes sensor 4 of intelligent wireless and host computer 7.Four sensors are arranged on respectively apart from treating that peg top is not less than 2 times of stake side surface places that treat peg diameter or the distance that broadens, and acceleration transducer 1 is arranged on same diameter with acceleration transducer 2 symmetries, and power sensor 3 is arranged on same diameter with power sensor 4 symmetries.When conditions permit, should try one's best and down install.For large diameter pile, the distance between sensor and stake top can suitably reduce, but can not be less than 1 times treats peg diameter or the distance that broadens.The material size of the material at sensor installation place and section should be identical with former pile body, and sensor must not be arranged near abrupt change of cross-section place.The center of each sensor should be positioned at the same level vertical with foundation pile axis to be measured, the acceleration transducer of homonymy 1 and power sensor 3, and horizontal range between acceleration transducer 2 and power sensor 4 should not be greater than 80mm, is generally 60-80mm.The central axis of each sensor should with pile center to be measured axle keeping parallelism, the mounting plane of each sensor should with treat that peg axis is parallel.Mounting plane material should be even, closely knit, smooth, otherwise will adopt sanding machine that surface finish is flat.The boring of each installation of sensors bolt should with treat that peg side surface is vertical.The erection bolt line of power sensor 3, power sensor 4 should be with pile center to be measured axle keeping parallelism and perpendicular to ground line.Each sensor after installing should be close to pile body to be measured surface, when hammering, must not produce slip.And need monitor the initial strain value of power sensor 3, power sensor 4.
C, start sensor.While carrying out high strain detection of dynamic test, normally start after four high strain transducers of intelligent wireless, must connect the Radio Link between each sensor in the host computer 7 end configurations with radio communication function.
D, initialize current hammer parameter.Must carry out one by one being arranged on four sensors treating on peg side.Current hammer parameter comprises triggering grade, sampling interval, frequency filtering.
E, sampling length is set.Send instruction by host computer 7, by the sampling length of the each sensor of wireless setting, comprise length and record sampling number writing time.Object be when four sensors are synchronous trigger after, start to record acceleration information and the stress data on pile body surface from the moment of triggering, until preset recording time span and record sampling number and finish.
F, activation threshold value is set.The moment on peg top is treated in high strain detecting test requirements document in weight hammering, must collect the data that pile body surface acceleration and pile body surface stress change simultaneously, therefore these four the high strain transducer of intelligent wireless inside are provided with synchronous trigger circuit 18, ensure that these four sensors can synchronously trigger, and determine some writing time.In this step, send instruction by host computer 7, by the synchronous activation threshold value of the each sensor of wireless setting, comprise acceleration rate threshold and stress threshold, be stored in respectively in the synchronous trigger circuit 18 of each sensor, as triggering benchmark relatively.
G, wait are dropped hammer.In this step, operating personnel put down weight freely falling body, and peg top is treated in weight hammering, cause whole peg generation acceleration and the STRESS VARIATION treated.The high strain acceleration transducer 1,2 of intelligent wireless detects the hammering dynamics of weight in real time, and the stress situation of high adaptability to changes sensor 3, the 4 dynamic monitoring pile bodies of intelligent wireless produces triggering by the hammering of weight respectively under default hammering dynamics and stress simultaneously.
H, judgement trigger.The acceleration rate threshold arranging in the accekeration of high strain acceleration transducer 1,2 Real-time Collections of intelligent wireless and step F compares, and the stress threshold arranging in the stress of high adaptability to changes sensor 3, the 4 dynamic monitoring pile bodies of intelligent wireless and step F compares.If reach activation threshold value, enter step I; If do not reach activation threshold value, return to step G continuation wait and drop hammer.
I, enable trigger, record trigger address.This step and step H are completed by synchronous trigger circuit 18.
J, record data.Cortex M3 single-chip microcomputer 19 starts to record from triggering the moment acceleration information that the high strain acceleration transducer 1,2 of intelligent wireless detects, and the stress data that detects of the high adaptability to changes sensor of intelligent wireless 3,4, until default writing time length and the sampling number of record finish.
K, transmission data.After having recorded, host computer 7 sends and obtains data command, receives after instruction, and each sensor sends to host computer 7 by wireless by record data, and host computer 7 can be stored and analyze data.After end of transmission, return to step D and wait for detection next time.
Although explanation and accompanying drawing have before been described embodiments of the invention, be to be understood that and can have various supplements, amendment and replacement not departing under the spirit of the principle of the invention that claims define and the prerequisite of protection domain.It should be appreciated by those skilled in the art that the present invention can change to some extent in form, structure, layout, ratio, material, element, assembly and other side according to concrete environment and job requirement in actual applications under the prerequisite that does not deviate from invention criterion.Therefore, embodiment disclosed here is only illustrative rather than definitive thereof, and protection scope of the present invention is defined by technical scheme in claims and legal equivalents thereof, and is not limited to description before this.
Claims (5)
1. the high strain transducer of intelligent wireless, comprise successively connected sensing drive circuit, sensing element, operational amplifier, high-pass filtering circuit (14), low-pass filter circuit (16), AD converter (17), Cortex M3 single-chip microcomputer (19), it is characterized in that, also comprise synchronous trigger circuit (18), CPLD(31), RF transmit-receive circuit (21), described synchronous trigger circuit (18) is through described CPLD(31) be connected with described AD converter (17), described CPLD(31) be connected with described Cortex M3 single-chip microcomputer (19), be used for setting activation threshold value, in the time that the data of AD converter (17) output reach described activation threshold value, described Cortex M3 single-chip microcomputer (19) is preserved the data that gather by default sampling length, described RF transmit-receive circuit (21) is connected with described Cortex M3 single-chip microcomputer (19), for carrying out radio communication with host computer (7), in described Cortex M3 single-chip microcomputer (19), set described activation threshold value by described host computer (7), sampling length, give described host computer (7) by the data of the default sampling length of preserving by wireless way for transmitting.
2. the high strain transducer of a kind of intelligent wireless as claimed in claim 1, it is characterized in that, the high strain transducer of described intelligent wireless is the high strain acceleration transducer of intelligent wireless, described sensing drive circuit is constant-current source circuit (11), and described sensing element is piezoelectric type acceleration sensing element (12).
3. the high strain transducer of a kind of intelligent wireless as claimed in claim 1, it is characterized in that, the high strain transducer of described intelligent wireless is the high adaptability to changes sensor of intelligent wireless, and described sensing drive circuit is Huygens's electric bridge (22), and described sensing element is resistance strain plate (23).
4. the high strain transducer of a kind of intelligent wireless as claimed in claim 1, it is characterized in that, described RF transmit-receive circuit (21) is the low-power consumption multiband radio transceiver chip Si4432 of Silicon Labs company, described rf chip Si4432 sets and is operated in 433MHz frequency range, its USART interface is connected with the USART1 interface of described Cortex M3 single-chip microcomputer (19), and baud rate is configured to 115200.
5. the high strain detecting method of intelligent wireless, is characterized in that, the steps include: to determine detecting pattern; Sensor installation; Start sensor; Initialize current hammer parameter; By wireless setting sampling length; By wireless setting activation threshold value; Wait is dropped hammer; Judgement triggers; Enable to trigger; Record data; Pass through wirelessly transmitting data.
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