CN105067099A - Method used for subway environment vibration and noise combined test and system thereof - Google Patents
Method used for subway environment vibration and noise combined test and system thereof Download PDFInfo
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Abstract
The invention provides a method used for a subway environment vibration and noise combined test. A group of wireless nodes are arranged in a selected test area at the periphery of the subway to acquire peripheral environment vibration and noise data of the subway. Each node is equipped with vibration acceleration and noise or sound level sensors onsite via a BNC interface. The acquired acceleration and sound pressure data are converted into environment evaluation weighing vibration level and sound level via DSP chips embedded in the node. All the wireless nodes are arranged in one wireless sensing network in a sharing way, and time synchronization is completed via an internal clock. After the primary test is completed, all the test data and processing results are wirelessly transmitted to a base station connected with the group of wireless nodes and finally stored in a PC terminal. The wireless nodes based on Zigbee communication are adopted to act as the wireless nodes. Installation is convenient and use is flexible so that the subway environment vibration and noise data can be acquired in real time simultaneously.
Description
Technical field
The present invention relates to the vibration & noise environmental monitoring field of urban track traffic, propose a kind of method and system for metro environment vibration and noise joint test.
Background technology
Along with Chinese society expanding economy, the fast development of subway transportation system, while offering convenience, the problems such as the ambient vibration that its operation causes and noise also become increasingly conspicuous, certain puzzlement is brought to the daily life of periphery crowd and work, even has influence on health.The ambient vibration that causes and noise analysis evaluation are run to city underground and becomes study hotspot in recent years, traditional evaluation method, cannot the engineering that causes of assay subway circulation and environmental problem comprehensively and accurately just using single vibration or noise as evaluation reference amount.
Summary of the invention
For above deficiency, the object of the present invention is to provide a kind of method and system for metro environment vibration and noise joint test, the vibration & noise level under metro environment can be obtained flexibly fast by this, realize the test and appraisal of subway surrounding enviroment, for the vibration and noise Survey of contamination status of sea products of subway neighboring area and anti-vibration noise reducing work provide convenient.
For reaching above-mentioned purpose, technical step of the present invention is as follows: a kind of method and system for metro environment vibration and noise joint test; By laying one group of radio node selected the survey in district of subway periphery, obtain the data of subway surrounding enviroment vibration and noise, each node is equipped with vibration acceleration and noise or sound level sensor by bnc interface scene, and the acceleration of collection and acoustic pressure data are scaled weighted in environmental evaluation by the embedded dsp chip of node and shake level and sound level; All radio nodes are altogether in a radio sensing network, synchronous by the internal clocking deadline, and after completing once test, all test datas and result are all wirelessly transmitted to the base station is connected with one group of radio node and are also finally stored in PC and hold; Radio node adopts the radio node based on Zigbee communication;
A. lay node according to field condition, vibration and noise sensor is connected with node by bnc interface; Based on Zigbee communication technology, adopt the radio sensing network of node, base station, PC composition, regulate sample frequency, sampling duration, node time is synchronous; Wherein, vibration acceleration sensor need closely be fixed on the floor of test zone, and noise transducer then needs to hang on surveys 1.2m place on floor, district;
B. node data Acquire and process: the vibration that end sensor gathers and noisy analog signal first carry out signal amplification by the signal amplifier (OP2177 operational amplifier) that node is built-in; Enter low-pass filter (MAX29X series) again and carry out filtering; Then simulating signal transfers digital signal to by adc circuit (AD7766 chip), then (acceleration transducer signals is converted to shake level, noise transducer of weighted and converts sound level (weighted sound level) to complete the conversion process of data by embedded dsp chip (TMS320F28335 chip).
Wherein, to be converted to the shake formula of level of weighted as follows for vibration acceleration:
In formula, a
0for reference acceleration, value 10
-6m/s
2; a
wfor weighted acceleration root mean square, represent the effective value of weighted acceleration in certain hour, be formulated as:
In formula, a
icorresponding 1/3rd frequencys multiplication take advantage of the acceleration of each centre frequency; w
ifor each centre frequency accelerometer weight factor, with reference to IS02631-1997, formula is as follows:
In addition, to be converted to the formula of sound pressure level as follows for acoustic pressure:
In formula, P
0for reference acceleration, value 2 × 10
-5m/s
2; P is the sound pressure level of test gained.
Calculate the sound pressure level L of gained
p40 side's curves in the equal loudness contour that substitution ISO226-2003 specifies can obtain A sound level, are designated as L
aE.
C. data store and result output: after completing a data acquisition, the data after process pass to base station via wireless transmission protocol, then dump to PC end via base station.
Each node all connects vibration acceleration sensor and sound pressure sensor by bnc interface, simultaneously collection site vibration acceleration (m/s
2) and noise acoustic pressure data (Pa).
By embedding dsp chip programming to radio node, data directly can be scaled in environmental evaluation conventional weighted at intra-node and to shake level (dB) and A-weighted sound level (dB).
A kind of system for metro environment vibration and noise joint test, it is characterized in that utilizing Zigbee wireless transmission protocol from organizing radio sensing network, whole system comprises one group of terminal node, base station, PC composition based on the radio sensing network of Zigbee communication, and each node is synchronous by the internal clocking deadline; Each node all can connect vibration acceleration sensor and sound pressure sensor by bnc interface, gather vibration acceleration and sound pressure level data simultaneously, vibration acceleration sensor need closely be fixed on the floor of test zone, and noise transducer then needs to hang on surveys 1.2m place on floor, district; Vibration and noise sensor is connected with node by bnc interface;
Each node is equipped with vibration acceleration and noise or sound level sensor by bnc interface scene, and the acceleration of collection and acoustic pressure data are scaled weighted in environmental evaluation by the embedded dsp chip of node and shake level and sound level; All test datas and result are all wirelessly transmitted to the base station that is connected with one group of radio node and are finally stored in PC and hold;
The vibration of the sensor collection of terminal node and noisy analog signal first carry out signal amplification by the signal amplifier OP2177 operational amplifier that node is built-in; Enter low-pass filter (MAX29X series) again and carry out filtering; Then simulating signal transfers digital signal to by adc circuit (AD7766 chip), then (acceleration transducer signals is converted to shake level, noise transducer of weighted and converts sound level (weighted sound level) to complete the conversion process of data by embedded dsp chip (TMS320F28335 chip).
In node, each module all adopts the miniature electronic part (OP2177 signal amplifier, MAX29X series 8 rank low-pass switched capacitor wave filters, AD7766 circuit, TMS320F28335 chip) of low-power consumption, is easy to install, changes quick.The built-in chargeable lithium cell of node, meets the continuous firing of more than 8 hours.
From the above technical solution of the present invention shows that, the invention has the beneficial effects as follows, compared with conventionally test: this invention adopts wireless transmission method and node autogamy power supply unit, avoids on-the-spot bracing wire, installation work; Subway periphery vibration acceleration and noise delta data can be obtained simultaneously, and directly can be scaled in environmental evaluation conventional weighted at intra-node and to shake level and A sound level, avoid numerous and diverse late time data processing procedure.This invention can provide convenient for the vibration and noise Survey of contamination status of sea products of subway neighboring area and anti-vibration noise reducing work.
Accompanying drawing explanation
Fig. 1 is working-flow figure of the present invention.
Fig. 2 is system construction drawing of the present invention.
Fig. 3 is wireless sensor node structural drawing of the present invention.
Fig. 4 is intra-node operational flowchart of the present invention.
Fig. 5 is that the vibration acceleration of calculated examples interior joint collection and the weighted after process shake a grade result of variations.
Fig. 6 is the acoustic pressure of calculated examples interior joint collection and the A change in sound level result after process.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the present invention is elaborated, but range of application of the present invention is not limited thereto.
Composition graphs 1, the propagation of the vibration & noise that subway circulation produces nearby in environment can have influence on work, the quality of life of periphery crowd.The environmental testing of general routine only considers single vibration or noise factor, the present invention adopts one group of wireless sensing node to be laid in target area, the vibration and noise data of environment can be obtained simultaneously, to be shaken level and A sound level by the weighted of the exportable environment of intra-node process, and be kept at PC end.The result obtained can supply administrative authority's reference, to control targetedly ambient vibration and noise pollution and to administer in time.
Composition graphs 2, System's composition of the present invention comprises one group of wireless sensor node, base station and PC end.Arbitrary sensor node all connects outfit vibration acceleration sensor and sound pressure sensor, vibration acceleration and acoustic pressure data can be gathered simultaneously, and the conversion calculating of data is completed at intra-node, after test completion, the result be stored in node forwards base station to by wireless transmission protocol, can be stored in PC end more further via base station.
Composition graphs 3, wireless sensor node of the present invention is made up of signal acquisition module (external vibration and noise sensor), signal-adjusting module, data processing module, wireless communication module and supply module.Node connects external sensor module by bnc interface, is respectively IEPE type AI500 acceleration transducer and condenser type AWA14423 microphone, is used for gathering vibration and noise signal; By the OP2177 signal amplifier in signal-adjusting module, MAX29X series 8 rank low-pass switched capacitor wave filters, realize simulating signal and amplify and anti-aliasing low-pass filtering function; First data computing module transfers simulating signal to numerical signal by AD7766 analog to digital conversion circuit, then carries out real-time computing by the dsp chip (TMS320F28335 chip) of embedded programming to data; Wireless communication module uses general Zigbee communication element, is responsible for the self-organizing network structure of each node and the wireless transmission of data; Supply module is responsible for the energy supply of whole node, is chargeable lithium cell.
Composition graphs 4, the concise and to the point step of data acquisition and procession of the present invention is as follows:
The first step: certainly organize radio sensing network, by calling Cygwin software at PC end, to preset sample frequency be 280Hz, sampling duration 100s, and carry out time synchronized to node.
Second step: gather vibration and noise data, carries out adaptive mode analog signal and amplifies with filtering and the data of acquisition are carried out calculation process at intra-node dsp chip.
In this step, calculate weighted according to filtered vibration acceleration and to shake level, formula is as follows:
In formula, a
0for reference acceleration, value 10
-6m/s
2; a
wfor weighted acceleration root mean square, represent the effective value of weighted acceleration in certain hour, be formulated as:
In formula, a
ithe acceleration of each centre frequency in corresponding 1/3rd octaves; w
ifor each centre frequency accelerometer weight factor, with reference to IS02631-1997, formula is as follows:
Meanwhile, calculate A sound level according to filtered sound pressure level, formula is as follows:
In formula, P
0for reference acceleration, value 2 × 10
-5m/s
2; P is the sound pressure level of test gained.
By sound pressure level L
psubstitute into 40 side's equal loudness contours and obtain A sound level data, be designated as L
aE.
3rd step: after completing test, is sent to base station by raw data and result by wireless protocols, is finally stored into PC end.
Fig. 5 is that certain subway of directly exporting at PC end weighted circumferentially after the initial vibration acceleration information of the interior instant node collection of lower building and inter-process shakes a grade result.
Fig. 6 is certain subway of directly exporting at PC end A sound level result circumferentially after the initial acoustic pressure data that gathers of the interior instant node of lower building and inter-process.
Composition graphs 5 and Fig. 6, visible the present invention can realize the conversion of environmental evaluation index efficiently, avoids numerous and diverse late time data processing procedure.Utilize test data and result, and with reference to relevant vibration and noise regulation law standard, Fast Evaluation can be carried out to this metro environment, and can be later stage anti-vibration noise reducing work guidance is provided.
Claims (6)
1. the method for metro environment vibration and noise joint test, it is characterized in that laying one group of radio node by laying one group of radio node in subway periphery selected survey district, obtain the data of subway surrounding enviroment vibration and noise, each node is equipped with vibration acceleration and noise or sound level sensor by bnc interface scene, and the acceleration of collection and acoustic pressure data are scaled weighted in environmental evaluation by the embedded dsp chip of node and shake level and sound level; All radio nodes are altogether in a radio sensing network, synchronous by the internal clocking deadline, and after completing once test, all test datas and result are all wirelessly transmitted to the base station is connected with one group of radio node and are also finally stored in PC and hold; Radio node adopts the radio node based on Zigbee communication;
A. lay node according to field condition, vibration and noise sensor is connected with node by bnc interface; Adopting the radio sensing network that node, base station and PC form, by calling the predeterminable sample frequency of Cygwin software, sampling duration at PC end, and time synchronized being carried out to node; Wherein, vibration acceleration sensor need closely be fixed on the floor of test zone, and noise transducer then needs to hang on surveys 1.2m place on floor, district;
B. node data Acquire and process: the vibration of end sensor collection and noisy analog signal first carry out signal amplification by the signal amplifier that node is built-in; Enter low-pass filter (MAX29X series) again and carry out filtering; Then simulating signal transfers digital signal to by adc circuit, then completes the conversion process of data by embedded dsp chip, and acceleration transducer signals is converted to weighted and shakes level, and noise transducer converts weighted sound level to.
2. the method for vibration and noise joint test according to claim 1, is characterized in that vibration acceleration is converted to the shake formula of level of weighted as follows:
In formula, a
0for reference acceleration, value 10
-6m/s
2; a
wfor weighted acceleration root mean square, represent the effective value of weighted acceleration in certain hour, be formulated as:
In formula, a
icorresponding 1/3rd frequencys multiplication take advantage of the acceleration of each centre frequency; w
ifor each centre frequency accelerometer weight factor, formula is as follows:
In addition, to be converted to the formula of sound pressure level as follows for acoustic pressure:
In formula, P
0for reference acceleration, value 2 × 10
-5m/s
2; P is the sound pressure level of test gained;
Calculate the sound pressure level L of gained
pthe 40 side's curves substituted in the equal loudness contour of ISO226-2003 can obtain A sound level, are designated as L
aE;
C. data store and result output: after completing a data acquisition, the data after process pass to base station via wireless transmission protocol, then dump to PC end via base station.
3. the method for vibration and noise joint test according to claim 1, is characterized in that each node all connects vibration acceleration sensor and sound pressure sensor by bnc interface, simultaneously collection site vibration acceleration (m/s
2) and noise acoustic pressure data (Pa).
4. the method for vibration and noise joint test according to claim 1, it is characterized in that by embedding dsp chip programming to radio node, data to be directly scaled in environmental evaluation conventional weighted at intra-node and to shake level (dB) and A-weighted sound level (dB).
5., for a system for metro environment vibration and noise joint test, it is characterized in that comprising one group of terminal node, base station, PC composition based on the radio sensing network of Zigbee communication, each node is synchronous by the internal clocking deadline; Each node all can connect vibration acceleration sensor and sound pressure sensor by bnc interface, gather vibration acceleration and sound pressure level data simultaneously, vibration acceleration sensor need closely be fixed on the floor of test zone, and noise transducer then needs to hang on surveys 1.2m place on floor, district; Vibration and noise sensor is connected with node by bnc interface;
Each node is equipped with vibration acceleration and noise or sound level sensor by bnc interface scene, and the acceleration of collection and acoustic pressure data are scaled weighted in environmental evaluation by the embedded dsp chip of node and shake level and sound level; All test datas and result are all wirelessly transmitted to the base station that is connected with one group of radio node and are finally stored in PC and hold.
6. the system of vibration and noise joint test according to claim 5, is characterized in that the vibration of the sensor collection of terminal node and noisy analog signal first carry out signal amplification by the signal amplifier OP2177 operational amplifier that node is built-in; Enter low-pass filter again and carry out filtering; Then simulating signal transfers digital signal to by adc circuit, then completes the conversion process of data by embedded dsp chip.
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| CN106643902A (en) * | 2016-12-29 | 2017-05-10 | 深圳天珑无线科技有限公司 | Comfort level evaluation method and apparatus |
| CN106815993A (en) * | 2015-11-27 | 2017-06-09 | 赵世伟 | Wireless type big data MEMS acceleration transducers are designed |
| CN107063606A (en) * | 2017-04-26 | 2017-08-18 | 和振兴 | The exciting device and Forecasting Methodology of predicted orbit traffic environment vibration and noise |
| CN107179201A (en) * | 2017-05-27 | 2017-09-19 | 北京交通大学 | The recognition methods of bullet train internal noise source and system |
| CN108871549A (en) * | 2018-03-19 | 2018-11-23 | 广州亿航智能技术有限公司 | Intelligent aircraft NVH test device, system and test method |
| CN109100101A (en) * | 2018-07-05 | 2018-12-28 | 北京市劳动保护科学研究所 | A method of simulation random vibration source strength |
| WO2019033832A1 (en) * | 2017-08-18 | 2019-02-21 | 比亚迪股份有限公司 | Noise processing method, apparatus and device for railway vehicle, and storage medium |
| CN110031084A (en) * | 2019-04-08 | 2019-07-19 | 上海工程技术大学 | A kind of vibration and noise on-Line Monitor Device and method for subway |
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| CN105334460A (en) * | 2015-11-27 | 2016-02-17 | 浙江大学城市学院 | Machine running state online monitoring analysis system based on noise and vibration analysis |
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| CN107179201A (en) * | 2017-05-27 | 2017-09-19 | 北京交通大学 | The recognition methods of bullet train internal noise source and system |
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| CN108871549A (en) * | 2018-03-19 | 2018-11-23 | 广州亿航智能技术有限公司 | Intelligent aircraft NVH test device, system and test method |
| CN109100101A (en) * | 2018-07-05 | 2018-12-28 | 北京市劳动保护科学研究所 | A method of simulation random vibration source strength |
| CN110031084A (en) * | 2019-04-08 | 2019-07-19 | 上海工程技术大学 | A kind of vibration and noise on-Line Monitor Device and method for subway |
| CN110149499A (en) * | 2019-05-21 | 2019-08-20 | 上海工程技术大学 | A kind of metro noise on-line monitoring system based on VR emulation |
| CN110657877A (en) * | 2019-09-20 | 2020-01-07 | 浙江省产品质量安全检测研究院 | Stereo garage vibration noise wireless detection system |
| CN114001819A (en) * | 2021-11-23 | 2022-02-01 | 青岛零一动测数据科技有限公司 | Rail transit vibration noise monitoring system |
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| CN105067099B (en) | 2018-10-16 |
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