CN108536961A - A kind of boat diesel engine air valve quantitative testing device - Google Patents
A kind of boat diesel engine air valve quantitative testing device Download PDFInfo
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- CN108536961A CN108536961A CN201810313357.3A CN201810313357A CN108536961A CN 108536961 A CN108536961 A CN 108536961A CN 201810313357 A CN201810313357 A CN 201810313357A CN 108536961 A CN108536961 A CN 108536961A
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- testing device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a kind of boat diesel engine air valves to wear quantitative testing device, including vibration detection module, Signal Pretreatment and analog-to-digital conversion module, analysis and processing module, cylinder-head vibration signals are detected by the acceleration transducer mounted on cylinder cover for diesel engine, it is converted and is decomposed using HHT, extraction and the relevant characteristic information of abrasion, on this basis, by normalized, the mapping relations of normalized value and air valve abrasion are established, it can on-line checking air valve wear extent, to improve the reliability for improving boat diesel engine work, economy has significant practicability.
Description
Technical field
The invention belongs to boat diesel engine performance monitoring and fault diagnosis technology fields, and in particular to a kind of boat diesel engine
Air valve wears quantitative testing device.
Background technology
Ship power system generates vibration and noise signals at work, and vibration signal includes that very abundant diesel engine is run
Status information.The method that can be diagnosed to internal spare parts logistics by analyzing diesel vibration noise signal is assessment
One of the important method of power system operation state and troubleshooting, therefore use the diagnosable diesel valve shape of vibration analysis
State.Diesel engine forms of motion is complicated, and system incentive source is more, including colliding, respectively of opening and closing of combustion vibration, inlet and exhaust valve
The collision etc. that mechanical movement part generates, and be mutually coupled serious therefore difficult using vibration signal online recognition diesel engine fault
It spends larger.
Diesel valve is diagnosed using vibration signal at present, is concentrated mainly on the qualitative research side of diesel valve state
Face, quantitative Diagnosis is few, and the online Quantitative Monitoring of valve clearance has very big difficulty.
Invention content
For the above-mentioned technical problems in the prior art, the present invention provides a kind of abrasion of boat diesel engine air valve is fixed
Amount detecting device is converted using HHT and is decomposed, extraction and the relevant characteristic information of abrasion, on this basis, at normalization
Reason, the correspondence between establishment model and characteristic parameter solve the problems, such as vibration signal online recognition difficulty, it can be achieved that bavin
The quantitative detection of oil machine air valve abrasion.
The present invention includes vibration detection module, Signal Pretreatment and analog-to-digital conversion module, analysis and processing module.The vibration
Detection module includes acceleration transducer, pressure sensor, photoelectric encoder；Acceleration transducer is installed on detected cylinder
At the top of cylinder cap, cylinder cap vibration information is extracted；Pressure sensor detects pressure information in cylinder of diesel engine；Photoelectric encoder is installed on
Diesel engine output end detects diesel engine speed and top dead centre information, provides location information.
The Signal Pretreatment and D/A converter module include signal pre-processing circuit and A/D conversion modules；A/D moduluss of conversion
Block is 24,4 tunnels；Signal pre-processing circuit believes the simulations such as acceleration signal, pressure signal, tach signal and top dead centre signal
It number is amplified and filters, by A/D conversion modules, be converted to digital signal, input computer disposal.
The analysis and processing module uses LabVIEW program development, including acquisition, data analysis and quantitative calculating；By A/D
The output signal of conversion module is based on top dead centre and tach signal, and in conjunction with cylinder pressure signal, interception air valve impact is most strong
Vibration signal, converted by HHT, Time Domain Decomposition carried out to vibration signal, obtains a series of intrinsic signals, selection can most reflect
Some intrinsic signals of vibration information calculate its Hilbert spectrums, by normalized, in conjunction with normalization amount and valve clearance
Correspondence, to calculate the wear extent of air valve；
The computer processing procedure includes the following steps：
1. useful signal extracts：Pass through top dead centre signal, tach signal and the cylinder pressure signal of photoelectric encoder, interception
The signal that air valve is hit in one period, totally 200 points；
2. signal Time Domain Decomposition：It is in the time domain a series of intrinsic signals by the signal decomposition of interception：
3. the Hilbert of decomposed signal is composed：Calculate the Hilbert spectrums of intrinsic signals：
4. a pair signal is normalized：Normalized value is：
η=Ei/ E × 100%, wherein
5. the mapping of normalized value and wear extent：Establish normalized value and valve clearance mapping curve；
6. wear extent quantitatively detects：The vibration signal detected in real time calculates normalized value by processing mode above-mentioned,
By comparing normalized value and valve clearance mapping curve, the wear extent of air valve can be quantitatively obtained in real time.
Beneficial effects of the present invention are：The present invention solves the problems, such as the quantitative description of diesel valve abrasion detection, can determine
The wear extent of amount monitoring air valve, improves stability, reliability and the economy of equipment operation, has significant practicability.
Description of the drawings
Fig. 1 is that diesel valve of the present invention wears quantitative testing device global design figure and each sub-module connection diagram；
Fig. 2 is that diesel valve of the present invention wears quantitatively detection calculating process schematic diagram；
Fig. 3 is normalized value of the present invention and valve clearance mapping graph；
In Fig. 1：1- acceleration transducers, 2- photoelectric encoders, 3- pressure sensors, 4- diesel engines, 5- propellers, 6- are passed
Moving axis, 7- bracing struts, 8- modulate circuits and data collecting card, 9- computers；
In Fig. 2：10- useful signals extract, 11- signal Time Domain Decompositions, the Hilbert spectrums of 12- decomposed signals, 13- signals
Normalization, the mapping of 14- normalized values and wear extent, 15- wear extenies quantitatively detect.
Specific implementation mode
Below in conjunction with attached drawing, the invention will be further described：
As shown in Figs. 1-2, the present invention is decomposed using HHT transformation, is extracted and is worn relevant characteristic information, basic herein
On, by normalized, it is difficult to solve vibration signal online recognition for the correspondence between establishment model and characteristic parameter
The problem of, it can be achieved that diesel valve abrasion quantitative detection.
The present invention includes vibration detection module, Signal Pretreatment and analog-to-digital conversion module, analysis and processing module；
The vibration detection module includes acceleration transducer 1, pressure sensor 3, photoelectric encoder 2, acceleration sensing
Device 1 is installed at the top of the cylinder cap of detected cylinder, extracts cylinder cap vibration information, and pressure sensor 3 detects cylinder of diesel engine internal pressure
Force information, photoelectric encoder 2 are installed on 4 output end of diesel engine, detect 4 rotating speed of diesel engine and top dead centre information, provide positioning letter
Breath.Acceleration transducer 1, photoelectric encoder 2 and 3 signal of pressure sensor carry out pre- by modulate circuit and data collecting card 8
After processing, digital signal input computer 9 is converted to, analyzing processing is carried out, air valve wear extent is identified by handling result.
The Signal Pretreatment and D/A converter module include signal pre-processing circuit and A/D conversion modules, A/D moduluss of conversion
Block is 24, and 4 tunnels, signal pre-processing circuit believes the simulations such as acceleration signal, pressure signal, tach signal and top dead centre signal
It number is amplified and filters, by A/D conversion modules, be converted to digital signal, input computer disposal.
The analysis and processing module uses LabVIEW program development, including acquisition, data analysis and quantitative calculating, by A/D
The output signal of conversion module is based on top dead centre and tach signal, and in conjunction with cylinder pressure signal, interception air valve impact is most strong
Vibration signal, converted by HHT, Time Domain Decomposition carried out to vibration signal, obtains a series of intrinsic signals, selection can most reflect
Some intrinsic signals of vibration information calculate its Hilbert spectrums, by normalized, in conjunction with normalization amount and valve clearance
Correspondence, to calculate the wear extent of air valve.The present invention is as follows using the course of work：
When boat diesel engine 4 works, mechanical energy is converted heat energy into, by being fixed on transmission shaft 6 on bracing strut 7, is exported
To propeller 5, the vibration of sensor detection, rotating speed, top dead centre, cylinder press signal after the pretreatments such as amplification filtering, pass through number
It is handled according to computer 9 is inputted after acquisition, processing procedure is as shown in Figure 2：
Useful signal extraction 10 in Fig. 2：Believed by the top dead centre signal, tach signal and cylinder pressure of photoelectric encoder 2
Number, the signal that air valve is hit in a period is intercepted, totally 200 points；
Signal Time Domain Decomposition 11 in Fig. 2：It is in the time domain a series of intrinsic signals by the signal decomposition of interception：
The Hilbert spectrums 12 of decomposed signal in Fig. 2：Calculate the Hilbert spectrums of intrinsic signals：
Signal normalization 13 in Fig. 2：Signal is normalized, normalized value is：
η=Ei/ E × 100%, wherein
The mapping 14 of normalized value and wear extent in Fig. 2：Establish normalized value and valve clearance mapping curve, such as Fig. 3；Figure
Wear extent quantitatively detects 15 in 2：The vibration signal detected in real time calculates normalized value, by right by processing mode above-mentioned
Than normalized value and valve clearance mapping curve, the wear extent of air valve can be quantitatively obtained in real time.
A kind of boat diesel engine air valve of the present invention wears quantitative testing device, by the processing of cylinder cap vibration information, calculating
Normalized value, and and normalized value --- valve clearance mapping graph compares, and obtains current diesel valve wear extent, and it can online really
Determine air valve wear extent, improves the reliability of boat diesel engine work, economy.
Claims (8)
1. a kind of boat diesel engine air valve wears quantitative testing device, it is characterised in that：Including vibration detection module, signal is located in advance
Reason and analog-to-digital conversion module, analysis and processing module；The vibration detection module includes acceleration transducer (1), pressure sensor
(3), photoelectric encoder (2)；The acceleration transducer (1) is installed at the top of the cylinder cap of detected cylinder, extraction cylinder cap vibration
Information；Pressure information in pressure sensor (3) the detection cylinder of diesel engine；The photoelectric encoder (2) is installed on diesel engine
(4) output end detects diesel engine (4) rotating speed and top dead centre information, provides location information；The Signal Pretreatment and digital-to-analogue conversion
Module includes signal pre-processing circuit and A/D conversion modules；The A/D conversion modules are 24,4 tunnels；The Signal Pretreatment
Circuit is amplified and filters to analog signals such as acceleration signal, pressure signal, tach signal and top dead centre signals, by A/
D conversion modules, are converted to digital signal, and input computer (9) is handled；The analysis and processing module is opened using LabVIEW programs
Hair, including acquisition, data analysis and quantitative calculating；By the output signal of A/D conversion modules using top dead centre and tach signal as base
Plinth, in conjunction with cylinder pressure signal, interception air valve impacts strongest vibration signal, is converted by HHT, and time domain is carried out to vibration signal
It decomposes, obtains a series of intrinsic signals, choose some intrinsic signals that can most reflect vibration information, calculate its Hilbert spectrums, lead to
Normalized is crossed, in conjunction with the correspondence of normalization amount and valve clearance, to calculate the wear extent of air valve.
2. a kind of boat diesel engine air valve as described in claim 1 wears quantitative testing device, it is characterised in that：The calculating
Machine (9) processing procedure includes the following steps：1. useful signal extracts (10), 2. signal Time Domain Decompositions (11), 3. decomposed signals
Hilbert composes (12), and 4. pairs of signals are normalized (13), the mapping (14) of 5. normalized values and wear extent, 6. abrasions
The quantitative detection (15) of amount.
3. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：It is described effective
Signal extraction (10)：By top dead centre signal, tach signal and the cylinder pressure signal of photoelectric encoder (2), a period is intercepted
The signal that interior air valve is hit, totally 200 points.
4. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：The signal
Time Domain Decomposition (11)：It is in the time domain a series of intrinsic signals by the signal decomposition of interception：
5. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：The decomposition
The Hilbert spectrums (12) of signal：Calculate the Hilbert spectrums of intrinsic signals：
6. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：The signal
It normalizes (13)：Signal is normalized, normalized value is：
η=Ei/ E × 100%, wherein
7. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：The normalizing
The mapping (14) of change value and wear extent：Establish normalized value and valve clearance mapping curve.
8. a kind of boat diesel engine air valve as claimed in claim 2 wears quantitative testing device, it is characterised in that：The abrasion
The quantitative detection (15) of amount：The vibration signal detected in real time calculates normalized value by processing mode above-mentioned, is returned by comparison
One change value and valve clearance mapping curve, can quantitatively obtain the wear extent of air valve in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810313357.3A CN108536961B (en) | 2018-04-09 | 2018-04-09 | Marine diesel engine air valve quantitative detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810313357.3A CN108536961B (en) | 2018-04-09 | 2018-04-09 | Marine diesel engine air valve quantitative detection device |
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| Publication Number | Publication Date |
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| CN108536961A true CN108536961A (en) | 2018-09-14 |
| CN108536961B CN108536961B (en) | 2021-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810313357.3A Active CN108536961B (en) | 2018-04-09 | 2018-04-09 | Marine diesel engine air valve quantitative detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112187942A (en) * | 2020-09-30 | 2021-01-05 | 武汉理工大学 | Edge computing system serving intelligent engine room |
| CN112796879A (en) * | 2020-12-21 | 2021-05-14 | 中国船舶重工集团公司第七一一研究所 | On-line testing method and device for air valve clearance of marine diesel engine |
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| CN102829962A (en) * | 2012-08-14 | 2012-12-19 | 杭州电子科技大学 | Quick wear test device of engine valve seat ring |
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| US20150068506A1 (en) * | 2008-05-28 | 2015-03-12 | General Electric Company | Multi-fuel control system and method |
| CN102829962A (en) * | 2012-08-14 | 2012-12-19 | 杭州电子科技大学 | Quick wear test device of engine valve seat ring |
| CN102944764A (en) * | 2012-12-03 | 2013-02-27 | 四川农业大学 | Device for measuring dynamic change of friction static electricity and friction property of insulating material |
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| CHEN GUOJIN 等: "Simulation Analysis on Wearing Quantity of Marine Low-speed Diesel Engine’s Piston Ring", 《APPLIED MECHANICS AND MATERIALS》 * |
| 彭章明 等: "船用低速柴油机活塞环磨损量监测的仿真试验研究", 《船舶工程》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187942A (en) * | 2020-09-30 | 2021-01-05 | 武汉理工大学 | Edge computing system serving intelligent engine room |
| CN112796879A (en) * | 2020-12-21 | 2021-05-14 | 中国船舶重工集团公司第七一一研究所 | On-line testing method and device for air valve clearance of marine diesel engine |
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| CN108536961B (en) | 2021-10-12 |
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