CN101018169A - Intelligent radio sensing network node for engineering structure health monitoring - Google Patents
Intelligent radio sensing network node for engineering structure health monitoring Download PDFInfo
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Abstract
The disclosed intelligent wireless sensor network node for engineer structure quality monitor comprises: a wireless receiving-transmitting and data processing module including a wireless receiving-transmitting device, a CPU for time-share process and communication protocol, the memory, an I/O interface, an ADC on chip, and a system clock; and a resistance strain sensor signal modulating module including a resistance-strain/piezoelectric-ceramic sensor constant voltage bridge circuit, a voltage-amplifying/RC filter, and a voltage-track output module. This invention is light, needs small power, and has great local processing capacity, and fit to real-time online monitor.
Description
One, technical field
The present invention relates to a kind of device that is used for monitoring structural health conditions, relate in particular to a kind of network node that is used to set up the radio sensing network of structure-oriented health monitoring.
Two, background technology
Monitoring structural health conditions is a kind of very important use in the current actual engineering, is a kind of very important use of intellectual material structure.Structural healthy monitoring system is an a kind of bionic intelligence system, application in national product is very extensive, particularly in engineering, there are a lot of material structures to safeguard timely and to monitor,, effort consuming time with traditional monitoring method, and the expense costliness, and the technology of utilization monitoring structural health conditions just can make these shortcomings be improved.The technological merit of monitoring structural health conditions is outstanding: can monitor and safety evaluation on real-time online ground, from then saving maintenance cost; Rely on advanced test macro, can reduce the labour and reduce artificial erroneous judgement; Can combine with state-of-the-art technology timely; Great majority have self-repair function; The automaticity height can improve fail safe and reliability greatly.In recent years, progress along with material and structural damage characteristic signal Processing Technology Research, going deep into of sensing/Driving technique research, monitoring system more and more is applied in the practical project practice, such as advanced fighter plane and the health monitoring of health monitoring, spacecraft and the space station of extended active duty aircraft and the on-line monitoring of civilian structure.For example at aerospace field, composite material can improve the efficient of aircaft configuration owing to lightweight, high strength, high-modulus, reduces the aircaft configuration weight coefficient, and application aboard is more and more.State-of-the-art in the world at present the 4th generation opportunity of combat F22, the consumption of polymer matrix composites has reached 24% of aircaft configuration weight.In general, laminated composite is alleviating construction weight, improves bearing capacity and aspect performance such as stealthy is distinguished, yet its performance at aspects such as damage, inefficacies but is the mechanism complexity, and phenomenon is various, differentiates difficult.Traditional nondestructiving detecting means does not also possess the function of real-time online large tracts of land monitoring, and most of equipment complexity, and the cost height is time-consuming, thereby has limited the range of application of composite material.Therefore in recent years, the engineering structure health monitoring technology is the focus of studying both at home and abroad always.
The notion of radio sensing network is based on a simple equation: sensing technology+central processing unit+radio communication=thousands of potential application may.When needs when carrying out incessantly sensing, test and transmission of wireless signals such as environmental parameters such as temperature, luminous flux, displacement and noises, can consider the intelligentized radio sensing network of configuration in association area, realize testing goal by sensing data analysis to environment parameter to be measured.This technology has been applied in the fields such as the habit observation, material structure health monitoring, traffic administration, health care, disaster monitoring of national defense and military, animal.Distinct advantages such as wireless sensor network does not need the fixed network support, has rapid deployment, and survivability is strong; And utilize the distributed monitoring network of wireless sensor network composition can significantly reduce device wire quantity, make wireless senser can be installed on monitoring of environmental more complicated, the position that is not easy to go between easily; Because wireless sensor network node has the local signal processing function, a lot of signal message works of treatment can be finished the part near sensing node, to significantly reduce required information transmitted amount, and with the serial process of former cause central processing unit realization, the system of centralized decision-making, become a kind of parallel distributed information processing system, will improve the speed of service of monitoring system and the reliability and the flexibility of decision-making greatly; The radio sensing network low-power consumption characteristics of focus on consideration in the when design institute weight that also can reduce the energy resource supply device also can realize the long-term on-line monitoring to monitoring target in addition.
The original research of wireless sensor network derives from US military, and U.S. national defense Advanced Research Project Agency Net (DARPA) subsidizes the wireless senser development system that California Bai Keli university has developed " Smart Dust " (intelligent dust) by name or " Mote " in calendar year 2001.U.S. natural science fund committee formulated the sensor network project in 2003, invested 3,400 ten thousand dollars of basic research that are used to support this aspect.Under the promotion of U.S. natural science fund committee, schools such as the Bai Keli branch school, University of California of the U.S., the Massachusetts Institute of Technology, Cornell University, shirt rock branch school, Lip river, University of California have begun the research of the basic theory and the key technology of sensor network.Some universities and the research institution of countries such as Britain, Japan, Italy have also carried out the research work in this field one after another.Research has obtained some preliminary achievements in research.Present domestic wireless sensor network still is in conceptual phase, Tsing-Hua University, Shenyang automation research institute of the Chinese Academy of Sciences, Chinese Academy of Sciences's Hefei intelligence etc. unit begun to carry out the research of this respect.Research at the radio sensing network of structure-oriented health monitoring, the applicant had also once carried out some preliminary explorations, but because the at present domestic radio sensing network node of almost not developing voluntarily that can be used for monitoring structural health conditions, all be to buy the Mote product to carry out the exploration in early stage, this respect is bigger with external gap.
Three, summary of the invention
1, goal of the invention: the purpose of this invention is to provide a kind of intelligent radio sensing network node that is used for engineering structure health monitoring, to set up radio sensing network towards actual engineering structure health monitoring.
2, technical scheme: in order to reach above-mentioned goal of the invention, the present invention adopts two kinds of schemes.
The intelligent radio sensing network node that is used for engineering structure health monitoring of first kind of scheme can directly connect resistance strain sensor, it comprises wireless receiving and dispatching and data processing module and resistance strain sensor signal condition module, wherein, wireless receiving and dispatching and data processing module comprise wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock in the sheet, wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter is connected by the internal bus of sharing with system clock, and system clock provides the clock signal of processor and wireless communication operation; Resistance strain sensor signal condition module comprises resistance strain sensor constant voltage bridge circuit, voltage amplification/RC filtering and voltage follow output module, resistance strain sensor changes the variation of structural stress into the signal of telecommunication by the constant voltage bridge circuit, amplify the output signal and the interference of filtering power frequency of constant voltage bridge circuit then by signal amplification and RC filter circuit, process voltage follow output module will output to the interior analog to digital converter of CPU slice in wireless receiving and dispatching and the data processing module through the signal of conditioning at last.
Wireless transceiver comprises RIDIO control system, RF transceiver and hardware accelerator, and hardware accelerator is carried out bottom operation efficiently, supports to be directed to the operation of wireless communication, and wireless transceiver adopts the method for integrated circuit.
The intelligent radio sensing network node that is used for engineering structure health monitoring of second kind of scheme can directly connect piezoelectric transducer, it comprises wireless receiving and dispatching and data processing module and piezoceramic transducer signal condition module, wherein, wireless receiving and dispatching and data processing module comprise wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock in the sheet, wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter is connected by the internal bus of sharing with system clock, and system clock provides the clock signal of processor and wireless communication operation; Piezoceramic transducer signal condition module comprises electric charge amplification module, active power filtering module and voltage follow output module, piezoceramic transducer changes the variation of structural vibration response into quantity of electric charge transducing signal by piezoelectric effect, the electric charge amplification module is converted into voltage with quantity of electric charge transducing signal and amplifies, by active power filtering module filtering interference signals, last voltage follow output will output to the interior analog to digital converter of microprocessor sheet in wireless receiving and dispatching and the data processing module through the transducing signal of conditioning then.
Wireless transceiver comprises RIDIO control system, RF transceiver and hardware accelerator, and hardware accelerator is carried out bottom operation efficiently, supports to be directed to the operation of wireless communication, and wireless transceiver adopts the method for integrated circuit.
The intelligent radio sensing network node that is used for engineering structure health monitoring of above-mentioned two kinds of schemes can cooperate the high-level software agreement, sets up into the radio sensing network that large-scale structure-oriented health monitoring is used, and is applied in the practical project monitoring structural health conditions.
High performance wireless receiving and dispatching among the present invention and data processing function module are prerequisite to share hardware resource, can separate general data path and wireless data pathway, and can compatible various communications protocols.Consider the lifetime of system and the system robustness of radio sensing network, need examine the requirement that reaches low-power consumption and robustness during this modular design.From the designing requirement of low-power consumption, because the power consumption of radio communication is the major part of module dissipation, hardware aspect must be selected the wireless transceiver of single-chip, low-power consumption for use; The software aspect must adopt advanced algorithm and agreement to shorten the duration of wireless transceiver active state, utilizes the mode of node side Local treatment can significantly reduce the wireless transmission data amount that needs in addition.Designing requirement from robustness, the method that adopts modular system to design can improve the robustness of system, promptly be divided into a plurality of independently submodules by design function, each function submodule can be tested soon independently, then they is combined into a complete application system; Submodule must be independent as much as possible, and external interface is little, to avoid the phase mutual interference of intermodule.
The core of wireless receiving and dispatching and data processing module is a central processing unit, is used for time-division processing operation requests and communication protocol.Adopt single processor structure fully for the consideration of treatment effeciency, all processor resources can be used for the operation of single task role in some occasion that needs.Unique core processor need have extra hardware circuit to support the operation of parallel processing subtly in this structure, improves the conversion efficiency of parallel work-flow as much as possible.Here the method that reduces parallel work-flow employing change-over time is to add register window, and CPU need not to operate data converted at every turn all will write into memory, only need be kept at simply in the empty registers group.Be connected with other assembly in the module by the internal bus of sharing with the data path of processing section correspondence, can also interconnect with ancillary equipment.Memory, I/O mouth, analog to digital converter, system clock and hardware accelerator all are to link to each other by such internal bus.By utilizing the internal bus of high speed, low latency, data can transmit between processor, memory and ancillary equipment easily.The ancillary equipment that is connected on the internal bus can directly obtain data from memory sub-system, also data can be delivered to UART ancillary equipment.All devices on the internal bus of sharing all is to operate by the memory interface of sharing; Each equipment can both be controlled the structure that is mapped in the shared address space; Multiple demands of applications can be dynamically satisfied in the shared address space of its each different operating special use.The employing that is also advantageous in that dedicated hardware accelerators of this structure.With respect to the inefficient operation of general data path, these hardware accelerators can be carried out bottom operation efficiently.Each accelerator all can support to be directed to the operation of wireless communication.By improving the efficient of these operations, the power consumption of node integral body can reduce greatly.Yet hardware accelerator only is aimed at the bottom operation of communication, does not comprise the execution of complete communication protocol, reshuffles this node by software simply and can support various communications protocols simultaneously.Hardware accelerator also supports those to be used for optimizing as far as possible the operation of wireless transceiver power consumption, is also advantageous in that the function that minimizes hardware, this for support efficiently application demand with separate communication and treatment channel necessary.
At the transducer that adopts in structural healthy monitoring system signal characteristic extremely, the radio sensing network node of design must directly connect two kinds of existing main transducers: strain transducer and piezoelectric transducer, so second largest functional module is the miniature conditioning module of corresponding transducing signal, promptly miniature strain transducer signal condition module and miniature piezoelectric sensor signal conditioning module.Piezoelectric transducer and resistance strain sensor are two kinds of sensing elements commonly used in the monitoring structural health conditions, has a series of advantage, as: (1) has the translation function between mechanical quantity and the electrical quantities, particularly piezoelectric element has the bi-directional conversion function, the ability that had both had sensing also has the ability of excitation; (2) piezoelectric element has very wide available band and favorable linearity, has very high sensitivity and wide dynamic range as sensing element; (3) be easy to combine with structure, piezoelectric ceramic not only can be taked the method that paste on the surface in addition, can also combine with structural material in the mode that inside embeds; (4) resistance strain gage also has easy stickup, sensitivity degree than characteristics such as height.Therefore these two kinds of transducers are used in monitoring structural health conditions research widely.But the signal that arrives owing to two kinds of element testing is general more small, greatly about about the mV level, so need follow-up modulate circuit that faint transducing signal is handled.What yet existing modulate circuit adopted substantially all is the power supply power supply of tens V even civilian electricity, and volume is very big, can not satisfy the powered battery and the low-power consumption requirement of sensor network, so adopted above-mentioned miniature resistance strain sensor signal condition module and miniature piezo-ceramic sensor signal conditioning module, the design of these two kinds of modulate circuits is very necessary.In conjunction with the communication of front and the radio sensing network node of processing module composition, can directly connect strain transducer and piezoceramic transducer, can set up the radio sensing network of structure-oriented health monitoring, be beneficial to of application and the development of radio sensing network technology in the engineering structure health monitoring field.
3, beneficial effect: based on the engineering structure health monitoring radio sensing network of intelligent radio sensing network node establishment of the present invention, can replace traditional wired monitoring network system fully, have in light weight, volume is little, low in energy consumption, configuration fast, advantage such as the Local treatment ability is strong, can set up the radio sensing network that is fit to engineering structure health monitoring, be convenient to realize the online health monitoring of large tracts of land of engineering structure.The volume of this intelligent node is slightly larger than the monobasic coin; The sustainable working life that surpasses a year under the low-power consumption mode; Cooperate the high-level software agreement, this numerous intelligent nodes can be configured to large-scale radio sensing network, be applied in the practical project monitoring structural health conditions.
Four, description of drawings
Fig. 1 is the intelligent radio sensing network node theory diagram that can directly connect resistance strain sensor;
Fig. 2 is the theory diagram that can directly connect the intelligent radio sensing network node of piezoelectric transducer;
Fig. 3 is a resistance strain sensor signal condition modular structure schematic diagram;
Fig. 4 is a piezoceramic transducer signal condition modular structure schematic diagram.
Five, embodiment
Embodiment 1: as shown in Figure 1, the intelligent radio sensing network node that can directly connect resistance strain sensor of present embodiment, comprise resistance strain sensor signal condition module and wireless receiving and dispatching and data processing module, wherein, as shown in Figure 1, wireless receiving and dispatching and data processing module comprise wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock, wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock high speed by sharing, the internal bus of low latency is connected, system clock provides the clock signal of processor and wireless communication operation, central processing unit is used for time-division processing operation requests and communication protocol, wireless transceiver comprises the RIDIO control system, RF transceiver and hardware accelerator, the form of employing integrated circuit; Hardware accelerator is carried out bottom operation efficiently, supports to be directed to the operation of wireless communication.
As shown in Figure 3, the miniature conditioning module of resistance strain sensor signal comprises resistance strain sensor constant voltage bridge circuit, voltage amplification, RC filtering and voltage follow output sub-module, its structure is as follows: it comprises resistance strain sensor constant voltage bridge circuit, operational amplifier A 1 and operational amplifier A 2, insert power supply between first end of resistance strain sensor constant voltage bridge circuit and the 3rd end, second end is connected with the reverse input end of operational amplifier A 1 by resistance R 2, the 4th end is connected with the positive input of operational amplifier A 1, the output of operational amplifier A 1 is connected with the positive input of operational amplifier A 2 by resistance R 3, the reverse input end of operational amplifier A 2 is connected with output, and the positive input of operational amplifier A 2 is by capacitor C 1 ground connection; The input of the analog to digital converter that the output signal of operational amplifier A 2 and central processing unit are inner integrated is connected.Resistance strain sensor changes the variation of structural stress into the signal of telecommunication by electric bridge, amplify the output signal and the interference of filtering power frequency of electric bridge then by signal amplification and filter circuit, through output stage the signal of conditioning is outputed to the AD converter of microprocessor chip integration one-tenth at last.As shown in Figure 1, that central microcontroller is that central processing unit adopts is the ATmega128 of Atmel, and main clock is provided by the crystal oscillator of the 8MHz of an outside, and processing speed can reach 800 ten thousand instruction per seconds (MIPS).ATMEGA128 belongs to 8 8-digit microcontrollers of best performance in the AVR series monolithic of Atmel company exploitation, it the is integrated FLASH program storage of 128Kb, 4Kb static RAM (SRAM), 8 path 10 position analog to digital converters, three hardware clocks, 48 general purpose I/O interfaces, a UART Universal Asynchronous Receiver Transmitter (UART), a synchronous serial Peripheral Interface.Generally speaking, just when manufacturing a product solidification software or on-site maintenance, need programme to embedded microcontroller.But in radio sensing network, need at any time microcontroller to be carried out reprogramming.Adopt coprocessor to the ATmega128 reprogramming in the design.For a unique network identification being provided for each node, each node all adopts the beautiful monobus silicon serial chip DS2401 that believes (Maxim) company in addition, and this is the ROM equipment of a low-power consumption, does not need external power supply.Wireless communication section has adopted the machine integrated radio frequency chip CC1000 of TI company, and it is the single-chip wireless transceiver of a frequency adjustable, and is low in energy consumption and simple with the interface and the circuit of microcontroller.External memory storage adopts the Atmel serial FLASH memory AT45DB041 of 4Mb, is used for the storage of data.The reason of selecting this memory for use is that its interface is simple and encapsulate little.The sensing data of main storage of collected and the transient program mirror image that transmits from network interface.Power management module is used for regulating and the feed system operating voltage, and power supply adopts No. five (AA) batteries of two joints, has selected Maxim1678 DC-to-DC (DC-DC) transducer for use, and 3.3V is provided direct current, and the minimum input voltage that Maxim1678 allows is 1.1V.Under the super low-power consumption park mode, close DC boost converter and can reduce power consumption, but wireless transceiver will quit work simultaneously.I/O expansion subsystem adopts the board to board connector of one 51 pin, is used for the sensor board and the programming plate of external various needs.Connector can be divided into five parts: interface, 4 external interrupt interfaces, 1 IIC interface, 1 SPI interface, 1 serial port and 1 interface to microcontroller programming are compared in 8 analog interfaces, 8 power supply control interfaces, 3 pulse width modulation interfaces, 2 simulations.Expansion connector can be used for node is programmed, and communicates with other equipment, such as the PC as gateway node.The equipment of data to any RS-232 of possessing agreement can be controlled or provide to the UART interface of standard in addition.
As shown in Figure 3, in the resistance strain sensor signal condition module of present embodiment, resistance strain sensor constant voltage bridge circuit is converted into voltage change signal with the resistance variations of resistance-strain senser.Owing to very little from the magnitude of voltage of strain gauge bridge output, so at first will will amplify from the magnitude of voltage of strain gauge bridge output through amplifying circuit, the scope of amplification multiple is 100-1000 times, and need have good adjustability.That in addition, operational amplifier is selected for use is INA128 and LF412.INA128 is the accurate instrumentation amplifier of U.S. B-B company, has precision height, low in energy consumption, advantage such as common-mode rejection ratio is high and working band is wide, is fit to various tiny signals are amplified.According to the variation of outer meeting resistance, can select different multiplication factors for use.Concrete amplification formula is that G=1+50k/Rg.G is the multiplication factor of actual needs, and Rg is adjustable resistance.The scope that strain gauge bridge generally picks and places big multiple is 100-1000 times, and adjustable resistance Rg is 50-500 ohm as calculated.The output of instrumentation amplifier need add low pass filter, so that the High-frequency Interference composition in the filtered signal path, filter circuit adopts the simplest resistance capacitance to form RC network, with the radio-frequency component elimination, is f=53HZ by frequency with electric capacity impulse electricity characteristic.
Embodiment 2: as shown in Figure 2, the intelligent radio sensing network node that can directly connect piezoceramic transducer of present embodiment, comprise piezoceramic transducer signal condition module and wireless receiving and dispatching and data processing module, wherein, wireless receiving and dispatching is identical with embodiment 1 with the structure of data processing module; Piezoceramic transducer signal condition module comprises that electric charge amplifies, active power filtering and voltage follow output sub-module, its structure as shown in Figure 4, adopt the computing amplifying unit of four phase cascades, first computing amplifying unit transfers the quantity of electric charge to voltage, second computing amplifying unit is second order high pass active power filtering unit, the 3rd computing amplifying unit is step low-pass active power filtering unit, the 4th computing amplifying unit is the voltage amplification output stage, voltage is further amplified, describe below in conjunction with accompanying drawing 4, the signal of extraneous sensor acquisition is by the reverse input end of resistance R 1 input operational amplifier A1, be connected with capacitor C 1 between the reverse input end of operational amplifier A 1 and the output, capacitor C 1 is in parallel with resistance R 2, and the positive input of operational amplifier A 1 is by resistance R 3 ground connection; The output of operational amplifier A 1 is connected with the positive input of operational amplifier A 2 by capacitor C 2, the C3 that is in series, the output of operational amplifier A 2 is connected with resistance R 5, the other end of resistance R 5 inserts between capacitor C 2 and the C3, the positive input of operational amplifier A 2 is connected with an end of resistance R 4, the other end ground connection of resistance R 4, the reverse input end of operational amplifier A 2 and output are connected to resistance R 6, the reverse input end of operational amplifier A 2 is by resistance R 7 ground connection, and resistance R 7 non-ground connection one ends are connected with resistance R 6; The output of operational amplifier A 2 is connected with the positive input of operational amplifier A 3 by resistance R 8, the R9 that is in series, the output of operational amplifier A 3 is connected to capacitor C 5, the other end of capacitor C 5 is connected between resistance R 8, the R9, the positive input of operational amplifier A 3 is by capacitor C 4 ground connection, the reverse input end of operational amplifier A 3 is by resistance R 11 ground connection, non-ground connection one end of resistance R 11 be connected with resistance R 10, the other end of resistance R 10 is connected with the output of operational amplifier A 3; The output of operational amplifier A 3 is connected with the reverse input end of operational amplifier A 4, is connected by resistance R 14 between the output of operational amplifier A 4 and the reverse input end, and the positive input of operational amplifier A 4 is by resistance R 15 ground connection.The output of operational amplifier A 4 and central processing unit are that the input of the inner integrated AD converter of microcontroller is connected.
Fourth stage computing amplifying unit can be divided into voltage amplification and voltage follow output two stage amplifer circuit and realize as the output stage of charge amplifying circuit.Output in operational amplifier A 3 is connected with a single-pole double-throw switch (SPDT) S1, and the reverse input end of operational amplifier A 4 is connected in parallel to resistance R 12, R13, is connected with resistance R 12 or R13 by single-pole double-throw switch (SPDT) S1 to change voltage amplification factor.
Piezoceramic transducer changes the variation of structural vibration response into quantity of electric charge transducing signal by piezoelectric effect, electric charge amplifies submodule the quantity of electric charge is converted into voltage and amplification, disturb and high-frequency noise by active power filtering submodule filtering interference signals such as power frequency then, last voltage follow output outputs to the AD converter that the microprocessor chip integration becomes with the transducing signal of conditioning.The operational amplifier model is selected opa340, and opa340 is full amplitude of oscillation CMOS amplifier, and minimum operating voltage can reach 2.5V, and unity gain bandwidth reaches 5.5MHz, and this chip satisfies high impedance and these two performance index of high open-loop gain fully.The frequency band of this signal condition module is 1.6KHz-5.3MHz, can satisfy the requirement of the most structure corresponding signal monitorings of input.
In test to embodiment 1 and embodiment 2, adopt the sensor signal of the method analog input of function generator input test signal, wireless receiving and dispatching and data processing module are tested.Mainly carried out the test of two aspects in the test experiments, the test of power consumption and wireless transmission distance.At first be to have tested the power consumption performance, adopt No. five (AA) powered battery of two joints, on four nodes, adopt the CntToLedsAndRfm application component (transmit a TOS packet per four seconds and light three LED) of TinyOS, less radio-frequency is set in 916MHz, delivering power is 0dBm, the operating current of this test about 10-15mA, other for example for the operation of Flash, CPU and programming than this operating current height.The time of node continuous operation is 170 hours when testing the AA battery that records employing capacity 2 * 1700mAh.If make this node always work in the operating state of super low-power consumption (less than 200uA), its operating time will can be satisfied the specific (special) requirements of certain applications to the system works life-span above 1 year.The transmission range of node and power consumption close ties, power consumption must be big under the big situation of wireless transmitted power, but its transmission range can increase simultaneously.The same CntToLedsAndRfm application component that adopts TinyOS of this test, can not receive packet (being that LED is not glittering) with node is the decision boundaries of transmission range.The transmission range that records of test can satisfy great majority use in to the requirement (indoor about 30 meters) of sensing network node distance, and if spacious in the open air environment test, transmission range will be farther.
Claims (4)
1, a kind of intelligent radio sensing network node that is used for engineering structure health monitoring, it is characterized in that, comprise wireless receiving and dispatching and data processing module and resistance strain sensor signal condition module, wherein, wireless receiving and dispatching and data processing module comprise wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock in the sheet, wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter is connected by the internal bus of sharing with system clock, and system clock provides the clock signal of processor and wireless communication operation; Resistance strain sensor signal condition module comprises resistance strain sensor constant voltage bridge circuit, voltage amplification/RC filtering and voltage follow output module, resistance strain sensor changes the variation of structural stress into the signal of telecommunication by the constant voltage bridge circuit, amplify the output signal and the interference of filtering power frequency of constant voltage bridge circuit then by signal amplification and RC filter circuit, process voltage follow output module will output to the interior analog to digital converter of CPU slice in wireless receiving and dispatching and the data processing module through the signal of conditioning at last.
2, a kind of intelligent radio sensing network node that is used for engineering structure health monitoring, it is characterized in that, comprise wireless receiving and dispatching and data processing module and piezoceramic transducer signal condition module, wherein, wireless receiving and dispatching and data processing module comprise wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter and system clock in the sheet, wireless transceiver, the central processing unit that is used for time-division processing operation requests and communication protocol, memory, the I/O mouth, analog to digital converter is connected by the internal bus of sharing with system clock, and system clock provides the clock signal of processor and wireless communication operation; Piezoceramic transducer signal condition module comprises electric charge amplification module, active power filtering module and voltage follow output module, piezoceramic transducer changes the variation of structural vibration response into quantity of electric charge transducing signal by piezoelectric effect, the electric charge amplification module is converted into voltage with quantity of electric charge transducing signal and amplifies, by active power filtering module filtering interference signals, last voltage follow output will output to the interior analog to digital converter of microprocessor sheet in wireless receiving and dispatching and the data processing module through the transducing signal of conditioning then.
3, the intelligent radio sensing network node that is used for engineering structure health monitoring as claimed in claim 1 or 2 is characterized in that, wireless transceiver comprises RIDIO control system, RF transceiver and hardware accelerator.
4, the intelligent radio sensing network node that is used for engineering structure health monitoring as claimed in claim 1 or 2, it is characterized in that, can cooperate the high-level software agreement, set up the radio sensing network that large-scale structure-oriented health monitoring is used, be applied in the practical project monitoring structural health conditions.
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