CN1072018A - Underwater noise wide frequency range transient acquisition, storage and disposal system - Google Patents
Underwater noise wide frequency range transient acquisition, storage and disposal system Download PDFInfo
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- CN1072018A CN1072018A CN 91108212 CN91108212A CN1072018A CN 1072018 A CN1072018 A CN 1072018A CN 91108212 CN91108212 CN 91108212 CN 91108212 A CN91108212 A CN 91108212A CN 1072018 A CN1072018 A CN 1072018A
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Abstract
Underwater noise wide frequency range transient acquisition, storage of the present invention and disposal system relate to is a kind of cavitation noise detecting instrument system.This system is by sensor, and cavitation noise collector, microcomputer and peripherals three parts thereof are formed.The cavitation noise collector is made up of amplifier, wave filter and transient wave storage.This system adopts transient wave storage high speed acquisition and quick Fourier transformation analysis of spectrum treatment technology, microcomputer reads the transient acquisition, storage data with self speed, new cavitation noise detection means and method is provided, be cavitation and cavitation erosion model investigation and prototype noise monitoring, a kind of wide frequency domain cavitation noise detection system that has the time-domain and frequency-domain analytic function concurrently is provided.
Description
The kind cavitation noise detecting instrument system that underwater noise wide frequency range transient acquisition, storage of the present invention and disposal system relate to.
Have various analog Digital Noise detecting instruments both at home and abroad, with pellet table B
﹠amp;K company walkaway instrument is representative, differ from one another, the scope of application and limitation, all can not satisfy research of hydraulic model cavitation and cavitation erosion and prototype monitoring demand, there is following weak point more or less: 1, Hz-KHz is wide inadequately, thereby lose the outer useful cavitation information of frequency response, 2, sample frequency is not high enough, thereby the high frequency waveforms distorton is big, 3, can not catch and have pulse waveform in the cavitation noise, 4, have only a passage or multichannel collecting asynchronous, 5, only be applicable to ergodic stationary stochastic process, thereby can not the record analysis nonstationary random process.Therefore still lack perfect means of testing and surveying instrument so far in cavitation and cavitation erosion research and the monitoring field.
The objective of the invention is deficiency at above-mentioned walkaway instrument existence, after adopting transient wave storage high speed acquisition, microcomputer reads the transient acquisition, storage data with self speed, adopt quick Fourier transformation (DFFT) analysis of spectrum treatment technology to solve the problems referred to above preferably then, and provide new cavitation noise detection means and method, be cavitation and cavitation erosion model investigation and prototype noise monitoring, a kind of wide frequency domain cavitation noise detection system that time domain and frequency-domain analysis function are arranged is provided.
Underwater noise wide frequency range transient acquisition, storage and disposal system take following scheme to realize: this system is made up of sensor, cavitation noise collector and microcomputer and peripherals three parts thereof.The cavitation noise collector is made up of amplifier, wave filter and transient wave storage.Have five passages and constitute each passage by sensor (nautical receiving set), prime amplifier, wave filter and transient state passage composition.In addition, configuration shared signal monitoring instrument, supervision institute connection road signal.The cavitation noise collector is by gating interface and microcomputer communication, and peripherals comprises digital-magnetic tape machine, floppy disk, screen, printer, registering instrument (drawing).
Underwater noise wide frequency range transient acquisition, storage and disposal system principle of work: high speed acquisition and wide frequency domain are deposited the function that realization (nautical receiving set and amplification filtering frequency response will be caught up with) utilizes transient wave to deposit to have the collection of multi-channel parallel high-speed a/d and store a segment signal waveform by transient wave, by the system controlled by computer transient acquisition, multi-channel synchronous is carried out, collection is continued, this moment, microcomputer read the data of transient state institute acquisition, storage with self speed, so move in circles, until required repeated acquisition number of times.Concerning stationary stochastic process, signal is interrupted repeated acquisition and continuous acquisition, as long as sample length is identical, both are equivalent.Common in the similar video display of said process " fast record is put slowly ", thus the microcomputer picking rate improved to used transient acquisition frequency, realized for 0.05～0.25 μ S sampling time, 1～1000KHZ wide frequency domain, and each passage is synchronous.The cavitation pulse capture deposits triggering level by transient wave and realization is preset in the address, after transient state receives the microcomputer order, beginning is successively gathered, circulation is stored in interior 2 to the 32K random acquisition memories of machine, in case signal amplitude surpasses preset level, continue to stop to continue after collection (the stochastic storing capacity subtracts the preset address number) individual data by signal internal trigger control, microcomputer is read 2～32K data from first address, comprising the signal of preset address in the corresponding period before sending out, thereby realize complete cavitation pulse signal acquisition.Fast Fourier Transform frequency analysis and transient state are interrupted continuous random or triggering collection, have the function of record and analysis non-stationary process,, all can finish spectrum estimation one time gathering sample each time, so different sample reflections different noise and frequency spectrums constantly are series of samples reflection nonstationary random process.
Underwater noise wide frequency range transient acquisition, storage and disposal system can be applicable to the cavitation and cavitation erosion experimental study, the simulation of cavitation and cavitation erosion intensity noise, cavitation type and the simulation of cavity type acoustical signature; Be used for the prototype acoustic monitoring, as to China's ten hundreds of water conservancy and hydropower outlet structure escape works engineering operation monitoring and to hydraulic machinery cavitation cavitation corrosion monitorings such as a large amount of hydraulic turbine water pumps etc.Also can be applied to fields such as shipbuilding circles.This system is with strong points, is applicable to research of water conservancy and hydropower cavitation and cavitation erosion and monitoring, the time-domain and frequency-domain analytic function that has concurrently applied widely; The good acquisition time of index advanced function can be selected, be up to 0.05 microsecond, the frequency domain scope can select to be up to 0.1HZ～1000KHZ, have at random and have general digital signal spectrum analysis characteristic (relative simulation system) with triggering collection function, random acquisition, triggering collection provides new walkaway means and methods such as catching cavitation pulse (single cavity, string cavity and the absolutely empty bubble of group crumble and fall pulse), but the acquisition and recording analysis is steady and nonstationary random process, multichannel synchronousing collection, analysis cavitation source position helps to structure the formation.
The invention will be further described below with reference to accompanying drawing.
Fig. 1 is underwater noise wide frequency range transient acquisition, storage and disposal system block scheme.
Form by sensor, cavitation noise collector, microcomputer and peripherals digital-magnetic tape machine thereof, floppy disk, screen, printer, X-Y recorder with reference to accompanying drawing underwater noise wide frequency range transient acquisition, storage and disposal system.This systemic-function cooperates pre-service, autopower spectrum, autocorrelation function, cross-power spectrum, cross correlation function and transport functions etc. such as realizing collection, storage, demonstration and the various statistic calculating of processing capacity selection statistical study, waveform and the demonstration of amplitude probability distribution, drawing, data analysis elimination DC component, filtering, windowing by research institute with software.Have 10 passages, each passage is formed by sensor (nautical receiving set), prime amplifier, wave filter and a transient state passage.1～8 passage is called high frequency L shelves, and the highest sample frequency of usefulness is the hyperchannel DBC transient state of 500KHZ, and the frequency band upper limiting frequency is 250KHZ, and 9～10 passages are called high frequency H shelves, and the highest sample frequency of usefulness is that BC-V or the BC8220 transient wave of 4000KHZ～20000KHZ deposited.In addition, configuration shared signal monitoring instrument can adopt 2427 automatic range digital voltmeters, and MS-1650A type slip demonstration transient wave storage, and peak counter can connect and need put output or transient state input end preceding, monitors institute's connection road signal.The cavitation noise collector is made up of amplifier, wave filter and transient wave storage.1～8 passage (high frequency L shelves), with 9～10 passages, (high frequency H shelves) each cavitation noise collector.The cavitation noise collector is by gating interface and microcomputer communication.
Claims (3)
1, a kind of underwater noise wide frequency range transient acquisition, storage and disposal system, it is characterized in that system is made up of sensor, cavitation noise collector, microcomputer and peripherals thereof, having a plurality of passages constitutes, each passage is by sensor, prime amplifier, wave filter and transient state passage are formed, adapted signal monitoring apparatus, monitoring institute connection road signal, system adopts transient wave storage high speed acquisition, microcomputer reads the transient acquisition, storage data with self speed, adopts quick Fourier transformation analysis of spectrum treatment technology.
2, underwater noise wide frequency range transient acquisition, storage according to claim 1 and disposal system, it is characterized in that each passage is by sensor (nautical receiving set), prime amplifier, wave filter and transient state passage composition, configuration shared signal monitoring instrument can connect and put output or transient state input end before need being connected on.
3, underwater noise wide frequency range transient acquisition, storage according to claim 1 and disposal system is characterized in that the cavitation noise collector is made up of amplifier, wave filter and transient wave storage, by gating interface and microcomputer communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108212 CN1072018A (en) | 1991-10-26 | 1991-10-26 | Underwater noise wide frequency range transient acquisition, storage and disposal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91108212 CN1072018A (en) | 1991-10-26 | 1991-10-26 | Underwater noise wide frequency range transient acquisition, storage and disposal system |
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| CN1072018A true CN1072018A (en) | 1993-05-12 |
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| CN 91108212 Pending CN1072018A (en) | 1991-10-26 | 1991-10-26 | Underwater noise wide frequency range transient acquisition, storage and disposal system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332186C (en) * | 2004-11-25 | 2007-08-15 | 上海交通大学 | Weak signal detection under complex background and characteristic analysis system |
| CN109489794A (en) * | 2018-10-19 | 2019-03-19 | 中国人民解放军海军工程大学 | A kind of a small amount of measuring point real time evaluating method of characteristics of ship underwater radiation noise |
| CN113916978A (en) * | 2021-08-26 | 2022-01-11 | 华能澜沧江水电股份有限公司 | Real-time monitoring method and system for cavitation of hydraulic tunnel during operation period based on audio |
-
1991
- 1991-10-26 CN CN 91108212 patent/CN1072018A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332186C (en) * | 2004-11-25 | 2007-08-15 | 上海交通大学 | Weak signal detection under complex background and characteristic analysis system |
| CN109489794A (en) * | 2018-10-19 | 2019-03-19 | 中国人民解放军海军工程大学 | A kind of a small amount of measuring point real time evaluating method of characteristics of ship underwater radiation noise |
| CN109489794B (en) * | 2018-10-19 | 2020-10-23 | 中国人民解放军海军工程大学 | Method for evaluating a small number of measuring points of underwater radiation noise of ship in real time |
| CN113916978A (en) * | 2021-08-26 | 2022-01-11 | 华能澜沧江水电股份有限公司 | Real-time monitoring method and system for cavitation of hydraulic tunnel during operation period based on audio |
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