CN101982810A - Rotary machine multi-point wireless stress acquisition method and device thereof - Google Patents
Rotary machine multi-point wireless stress acquisition method and device thereof Download PDFInfo
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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
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Abstract
The invention relates to a rotary machine multi-point wireless stress acquisition method and a device thereof. A plurality of wireless stress sensor nodes are fixed on stress acquisition positions such as a rotary mechanical axis, the nodes are connected with a strain gauge, the sensor node and a wireless access point form a star network for data transmission, the access point is connected with an industrial personal computer by virtue of a USB interface, network is constructed based on IEEE 802.15.4 physical layer, dynamic time division multi-access media access protocol is adopted, and work process thereof includes: system initialization is carried out, sampling frequency, time slot size, number and allocation plan are set according to various stress signal change rates, clock synchronization is set, the sensor node is started to carry out stress signal acquisition transmission, the access point transmits the received data to the industrial personal computer, and various sampling frequencies are adjusted according to respective stress signal change rate. The invention has the advantages that structure is simple, power consumption is low, antijamming capability is strong, each sensor node can have different sampling frequencies which can be adjusted in real time, and real-time synchronous acquisition of stress signals of multiple points can be realized.
Description
Technical field
The present invention relates to a kind of no uniaxial stress acquisition method and device, particularly a kind of multipoint wireless stress acquisition method and device of rotating machinery, be applicable to 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 objective of the invention 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 acquisition method and device easy to maintenance.
Technical scheme: rotating machinery multipoint wireless stress acquisition method of the present invention is: the need that some wireless strain gauge nodes are fixed in rotating machinery shaft system are gathered the stress place, be connected with foil gauge, wireless strain gauge node and a WAP are formed Star Network and are carried out data transmission, access point connects industrial computer by USB interface, network makes up based on IEEE 802.15.4 physical layer protocol, adopt the dynamic time division access media access protocol, the concrete collection with the transmission course of work is: access point is set sample frequency according to each stress signal rate of change, time slot size in the time division multiple access (TDMA) media access protocol, number and allocative decision, set clock synchronization, the start sensor node carries out stress signal collection and transmission according to the time slot allocation scheme, access point is sent to industrial computer with the data that receive by USB interface, and adjusts its sample frequency separately according to each stress signal rate of change.
The dynamic time division access media access protocol is followed following steps:
1) WAP is set the sample frequency of each sensor node: set the respective sensor sample frequency according to each sensor stress signal rate of change, stress signal changes fast more, and corresponding sample frequency is high more;
2) WAP is set number of timeslots and allocative decision thereof according to interference strength, volume of transmitted data, the sensor sample frequency setting time slot size of working environment according to sensor node quantity and sensor node sample frequency; When all slot transmission finish, it is a system transmissions cycle; If in the transmission cycle, i sensor node can use n
iIndividual time slot, then
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,
3) the wireless access time slot allocation scheme of naming a person for a particular job is notified each sensor node, and sets clock synchronization simultaneously, starts 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, gets back to step 1).
Rotating machinery multipoint wireless stress harvester of the present invention 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 present invention is based on the dynamic time division access agreement of stelliform connection topology configuration design, realize real time synchronous collection at the rotating machinery stress signal; 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 invention;
Fig. 2 is a multipoint wireless stress acquisition method schematic flow sheet of the present invention;
Fig. 3 is a wireless strain gauge node structure schematic diagram of the present invention;
Fig. 4 is the structure principle chart of WAP of the present invention.
Embodiment
Multipoint wireless stress harvester of the present invention is made of some wireless strain gauge nodes, WAP and industrial computer, and 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
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 (5)
1. rotating machinery multipoint wireless stress acquisition method, it is characterized in that: the need that some wireless strain gauge nodes are fixed in rotating machinery shaft system are gathered the stress place, be connected with foil gauge, wireless strain gauge node and a WAP are formed Star Network and are carried out data transmission, access point connects industrial computer by USB interface, network makes up based on IEEE 802.15.4 physical layer protocol, adopt the dynamic time division access media access protocol, the concrete collection with the transmission course of work is: access point is set sample frequency according to each stress signal rate of change, time slot size in the time division multiple access (TDMA) media access protocol, number and allocative decision, set clock synchronization, the start sensor node carries out stress signal collection and transmission according to the time slot allocation scheme, access point is sent to industrial computer with the data that receive by USB interface, and adjusts its sample frequency separately according to each stress signal rate of change.
2. rotating machinery multipoint wireless stress acquisition method according to claim 1, it is characterized in that: the dynamic time division access media access protocol is followed following steps:
1) WAP is set the sample frequency of each sensor node: set the respective sensor sample frequency according to each sensor stress signal rate of change, stress signal changes fast more, and corresponding sample frequency is high more;
2) WAP is set number of timeslots and allocative decision thereof according to interference strength, volume of transmitted data, the sensor sample frequency setting time slot size of working environment according to sensor node quantity and sensor node sample frequency; When all slot transmission finish, it is a system transmissions cycle; If in the transmission cycle, i sensor node can use n
iIndividual time slot, then
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,
3) the wireless access time slot allocation scheme of naming a person for a particular job is notified each sensor node, and sets clock synchronization simultaneously, starts 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, gets back to step 1).
3. 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, 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.
4. rotating machinery multipoint wireless stress harvester according to claim 3, 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.
5. rotating machinery multipoint wireless stress harvester according to claim 3, 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.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103941708A (en) * | 2014-05-09 | 2014-07-23 | 核工业理化工程研究院 | System and method for monitoring operation states of multiple rotating machines |
| CN106250819A (en) * | 2016-07-20 | 2016-12-21 | 上海交通大学 | Based on face's real-time monitor and detection facial symmetry and abnormal method |
| CN112459765A (en) * | 2020-12-08 | 2021-03-09 | 北京三一智造科技有限公司 | System and method for collecting load data of rotary drilling tool |
| CN113101057A (en) * | 2020-01-10 | 2021-07-13 | 尤妮佳股份有限公司 | Collection device, collection method, and computer-readable recording medium |
| CN113359645A (en) * | 2021-06-30 | 2021-09-07 | 四川交达预应力工程检测科技有限公司 | Prestressed construction monitoring and early warning system and method based on engineering Internet of things |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103941708A (en) * | 2014-05-09 | 2014-07-23 | 核工业理化工程研究院 | System and method for monitoring operation states of multiple rotating machines |
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| CN112459765B (en) * | 2020-12-08 | 2023-10-20 | 北京三一智造科技有限公司 | System and method for collecting load data of rotary drilling tool |
| CN113359645A (en) * | 2021-06-30 | 2021-09-07 | 四川交达预应力工程检测科技有限公司 | Prestressed construction monitoring and early warning system and method based on engineering Internet of things |
| CN113359645B (en) * | 2021-06-30 | 2023-04-21 | 四川交达预应力工程检测科技有限公司 | Prestress construction monitoring and early warning system and method based on engineering Internet of things |
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| CN101982810B (en) | 2012-07-04 |
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