CN201892859U - Multipoint wireless stress collection device of rotating machinery - Google Patents

Multipoint wireless stress collection device of rotating machinery Download PDF

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Publication number
CN201892859U
CN201892859U CN2010205255697U CN201020525569U CN201892859U CN 201892859 U CN201892859 U CN 201892859U CN 2010205255697 U CN2010205255697 U CN 2010205255697U CN 201020525569 U CN201020525569 U CN 201020525569U CN 201892859 U CN201892859 U CN 201892859U
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China
Prior art keywords
stress
radio transmitting
mcu controller
wireless
chip
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Expired - Fee Related
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CN2010205255697U
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Chinese (zh)
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李伟
朱真才
王重秋
陈光柱
张蕾
吴瑕
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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Abstract

The utility model relates to a multipoint wireless stress collection device of rotating machinery, wherein a plurality of wireless stress transducer nodes are fixed on the positions like a rotating machinery shafting, where stress collection is needed, and are connected with a strain gauge; the transducer nodes and a wireless access point form a star network to transmit data; the access point is connected with an industrial personal computer through a USB (universal serial bus) interface; the network is constructed based on IEEE (institute of electrical and electronic engineers) 802.15.4 physical layer; a dynamic time-division multiple-access media access protocol is adopted; the working process is that: a system is initialized, the sampling frequency, the size and the number of slot time, and the distribution scheme are set according to each stress signal changing rate, clock synchronization is set, the transducer nodes are started to implement the stress signal collection and transmission, the access point transmits the received data to the industrial personal computer, and the sampling frequency is adjusted according to each stress signal changing rate. The multipoint wireless stress collection device has the advantages of simple structure, low power consumption and strong anti-interference capacity; each transducer node has different sampling frequencies and can be adjusted in real time, thereby realizing the real-time synchronized collection of multipoint stress signals.

Description

Rotating machinery multipoint wireless stress harvester
Technical field
The utility model relates to a kind of wireless stress harvester, a kind of multipoint wireless stress harvester of rotating machinery particularly, be applicable to the real-time synchronous acquisition to the many places stress signal, unlike signal can have different sample frequency, and can adjust its sample frequency according to the stress signal rate of change.
Background technology
At present, the single wireless strain gauge node of the many uses of common rotating machinery stress acquisition system, being installed on axle upward needs to gather the stress place, links to each other with foil gauge, and by wireless signal stress value is sent to acceptance point, and acceptance point links to each other with industrial computer.This single-point acquiring system is difficult to be applicable to the synchronous acquisition of many places stress signal in multiaxis, the multicompartment complication system; And its radio band of using mostly is low-frequency range, is subject to the electromagnetic interference (EMI) in the site environment, influences the effect that reliability of data transmission and rotating machinery stress are gathered.
Summary of the invention
Technical matters: the purpose of this utility model is the problem that exists at prior art, provide that a kind of synchronous acquisition many places in real time stress signal, antijamming capability are strong, low in energy consumption, stability by force, multipoint wireless stress harvester easy to maintenance.
Technical scheme: rotating machinery multipoint wireless stress harvester of the present utility model comprises some wireless strain gauge nodes and a WAP, wireless strain gauge node is fixed on rotating machinery shaft and fastens some stress signal places that need to gather, WAP connects industrial computer by USB interface, wireless strain gauge node and WAP all adopt the 2.4GHz radio transmitting and receiving chip, and this chip adopts the dynamic time division access media access protocol described in IEEE 802.15.4 physical layer protocol and the claim 2.
Described wireless strain gauge node is made of strain bridge circuit module, signal conditioning circuit, MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, clock chip and power module based on IEEE 802.15.4 physical layer protocol, strain bridge circuit module connects signal conditioning circuit, the MCU controller is connected with signal conditioning circuit, radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with clock chip with signal conditioning circuit, MCU controller, radio transmitting and receiving chip.
Described WAP is made of MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, usb circuit, clock chip and power module based on IEEE 802.15.4 physical layer protocol, the MCU controller is connected with usb circuit with radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with MCU controller, radio transmitting and receiving chip and clock chip.
Beneficial effect: the utility model is realized the real time synchronous collection at the rotating machinery stress signal based on the dynamic time division access agreement of stelliform connection topology configuration design; WAP can be adjusted the sample frequency of sensor node automatically according to the signal that is collected, and unlike signal can have different sample frequency, when guaranteeing sample effect, has reduced power consumption; The present invention is based on the wireless technology of IEEE 802.15.4 physical layer protocol, adopt the 2.4GHz radio band, developed wireless sensor node and WAP, antijamming capability is strong, and transmission range is moderate, and is low in energy consumption; Apparatus of the present invention are simple in structure, and stability is strong, the reliability height, and installation, easy to maintenance, cost is low, and is highly sensitive.
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present utility model;
Fig. 2 is a multipoint wireless stress acquisition method schematic flow sheet of the present utility model;
Fig. 3 is a wireless strain gauge node structure schematic diagram of the present utility model;
Fig. 4 is the structure principle chart of WAP of the present utility model.
Embodiment
Multipoint wireless stress harvester of the present utility model is made of some wireless strain gauge nodes, WAP and industrial computer, wherein sensor node is installed on rotating machinery shaft and fastens collection place of some stress signals, and access point connects industrial computer by USB.Wireless sensor node and WAP are formed Star Network and are carried out data transmission, network makes up based on IEEE 802.15.4 physical layer protocol, adopt 2.4GHz radio transmitting and receiving chip and dynamic time division access media access protocol, the stress signal of wireless sensor node collection finally is sent to industrial computer by WAP.
Described wireless strain gauge node is made of strain bridge circuit module, signal conditioning circuit, MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, clock chip and power module based on IEEE 802.15.4 physical layer protocol, strain bridge circuit module connects signal conditioning circuit, the MCU controller is connected with signal conditioning circuit, radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with clock chip with signal conditioning circuit, MCU controller, radio transmitting and receiving chip.
Described WAP is made of MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, usb circuit, clock chip and power module based on IEEE 802.15.4 Physical layer, the MCU controller is connected with usb circuit with radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with MCU controller, radio transmitting and receiving chip and clock chip.
The method of rotating machinery multipoint wireless stress collection is: gathers stress signal by sensor node, is connected by 2.4GHz wireless telecommunications passage between sensor node and the access point, and formation hub-and-spoke network topology structure, wherein access point is a host node; Data transmission between sensor node and the access point is followed following dynamic time division access media access protocol:
1, sets the sample frequency of each sensor node: set respective sensor sample frequency f according to i sensor stress signal rate of change i, stress signal changes fast more, and corresponding sample frequency is high more;
2, access point is set time slot size τ according to the interference strength of working environment, volume of transmitted data, sensor sample frequency etc., set number of timeslots and allocative decision thereof according to sensor node quantity and sensor node sample frequency, promptly which time slot which sensor node can carry out data transmission at.When all slot transmission finish, be a system transmissions cycle, be designated as T, then
T＝Nτ。
If in the transmission cycle T, i sensor node can use n iIndividual time slot, then
N = Σ i = 1 p n i + n 0 ,
Wherein, N is the number of timeslots that sets, and p is a sensor node quantity, n 0For being used for the timeslot number of other network control command transfer, as clock synchronization etc.;
3, notify each sensor node with the time slot allocation scheme, and set clock synchronization simultaneously, start a transmission cycle;
4, each sensor node is pressed the time slot allocative decision data transmission of gathering is arrived access point, finishes a system transmissions cycle;
5, get back to step 1.
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Shown in Figure 1, embodiment block scheme to rotating machinery multiple spot stress harvesters such as genset, it is by four wireless strain gauge nodes, WAP and industrial computer constitute, wireless strain gauge node is fixed on rotating machinery shaft and fastens everywhere and need gather the stress signal place, link to each other with foil gauge, wireless sensor node and WAP are formed Star Network and are carried out data transmission, network makes up based on the 2.4GHz radio transmitting and receiving chip and the dynamic time division access media access protocol of IEEE 802.15.4 physical layer protocol, WAP connects industrial computer by USB interface
Accompanying drawing 2 is a multipoint wireless stress acquisition method flow process, and at first WAP is set sample frequency, time slot size, number of timeslots and allocative decision; Carry out clock synchronization then and start a transmission cycle, sensor node begins to gather and the transmission stress data according to the time slot allocation scheme; Access point receives information and carries out pre-service, judges the change degree of stress rate, and resets sample frequency thus; The data that access point is accepted finally are sent to industrial computer by USB interface.
In Fig. 3, wireless strain gauge node is made of strain bridge circuit module, signal conditioning circuit, MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, clock chip and power module based on IEEE 802.15.4 physical layer protocol, strain bridge circuit module connects signal conditioning circuit, the MCU controller is connected with signal conditioning circuit, radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with clock chip with signal conditioning circuit, MCU controller, radio transmitting and receiving chip.Strain bridge circuit module is made up of four foil gauges, constitutes full-bridge circuit.Signal conditioning circuit is made of filter amplification circuit and drift adjustment module, and the voltage signal that the strain bridge circuit is exported converts standard signal input MCU controller to.The MCU controller is selected MSP430F1611 low-power consumption chip for use, 12 A/D converters of integrated 8 passages of this chip, the Flash of 48KB, the RAM of 10KB.Clock chip is selected X1226, is used for timing wake-up MCU controller and gathers stress information.2.4GHz radio transmitting and receiving chip is selected MC13213 low-voltage and low-power dissipation chip, the stress data that this chip is used for the MCU controller is gathered arrives WAP by the PCB antenna transmission, its communication speed is 250kbps, more than the transmission range 100m, the simple media access protocol that this chip provides is convenient to secondary development.Power module is made of lithium battery and TPS65010 power management chip, for signal conditioning circuit, MCU controller, clock chip and 2.4GHz radio transmitting and receiving chip provide 3.3V stabilized voltage supply.
In Fig. 4, WAP is made of MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, usb circuit, clock chip and power module based on IEEE 802.15.4 physical layer protocol, the MCU controller is connected with usb circuit with radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with MCU controller, radio transmitting and receiving chip and clock chip.Usb circuit is made of protocol conversion chip FT232BM and respective peripheral circuit, is used for being connected of industrial computer and WAP, so that data storage and analysis.Other part type selectings are identical with sensor node.

Claims (3)

1. rotating machinery multipoint wireless stress harvester, it is characterized in that: this device comprises some wireless strain gauge nodes and a WAP, wireless strain gauge node is fixed on rotating machinery shaft and fastens some stress signal places that need to gather, WAP connects industrial computer by USB interface, and wireless strain gauge node and WAP all adopt the 2.4GHz radio transmitting and receiving chip.
2. rotating machinery multipoint wireless stress harvester according to claim 1, it is characterized in that: described wireless strain gauge node is by strain bridge circuit module, signal conditioning circuit, the MCU controller, 2.4GHz radio transmitting and receiving chip based on the IEEE802.15.4 physical layer protocol, the PCB antenna, clock chip and power module constitute, strain bridge circuit module connects signal conditioning circuit, MCU controller and signal conditioning circuit, radio transmitting and receiving chip connects, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, power module and signal conditioning circuit, the MCU controller, radio transmitting and receiving chip is connected with clock chip.
3. rotating machinery multipoint wireless stress harvester according to claim 2, it is characterized in that: described WAP is made of MCU controller, 2.4GHz radio transmitting and receiving chip, PCB antenna, usb circuit, clock chip and power module based on IEEE 802.15.4 physical layer protocol, the MCU controller is connected with usb circuit with radio transmitting and receiving chip, the radio transmitting and receiving chip output terminal is connected with the PCB antenna, clock chip is connected with the MCU controller, and power module is connected with MCU controller, radio transmitting and receiving chip and clock chip.
CN2010205255697U 2010-09-10 2010-09-10 Multipoint wireless stress collection device of rotating machinery Expired - Fee Related CN201892859U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101982810A (en) * 2010-09-10 2011-03-02 中国矿业大学 Rotary machine multi-point wireless stress acquisition method and device thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101982810A (en) * 2010-09-10 2011-03-02 中国矿业大学 Rotary machine multi-point wireless stress acquisition method and device thereof
CN101982810B (en) * 2010-09-10 2012-07-04 中国矿业大学 Rotary machine multi-point wireless stress acquisition method and device thereof

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Granted publication date: 20110706

Termination date: 20120910