CN101787715B - Method used for testing stability of foundation of fan suspended in road tunnel and system therefor - Google Patents
Method used for testing stability of foundation of fan suspended in road tunnel and system therefor Download PDFInfo
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- CN101787715B CN101787715B CN2010101151477A CN201010115147A CN101787715B CN 101787715 B CN101787715 B CN 101787715B CN 2010101151477 A CN2010101151477 A CN 2010101151477A CN 201010115147 A CN201010115147 A CN 201010115147A CN 101787715 B CN101787715 B CN 101787715B
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Abstract
The invention discloses a method used for testing the stability of the foundation of a fan suspended in a road tunnel and a system therefor, which is characterized in that the method comprises the three steps of acquiring standard reference information, acquiring detection information and judging comparison, wherein the information in the judging comparison refers to the time domain waveform, the frequency spectrum and the variation tendency of a signal generated by the vibration situation detected by the fan in the whole process from starting to steady running; and the system comprises a vibrating sensor, a signal amplification circuit, a filter circuit, a sample circuit, a CPU central controller, a keyboard module, a display, a data storage unit and an analysis processing computer. The invention has the obvious effects that the failure condition of a welded bracket can be detected, the loosening condition between a precast steel plate and a precast reinforcement as well as between the precast reinforcement and concrete can also be detected, the fan does not need to be detached in the testing process, the running of equipment is not affected, the principle of the system is simple, the production cost is low, the test operation is simple and convenient, and the result is reliable and visualized.
Description
Technical field
The present invention relates to suspension equipment Detection of Stability field, specifically, is a kind of method and system that stability of foundation of fan suspended in road tunnel detects that is used for.
Background technology
Along with developing rapidly of highway in China traffic, vcehicular tunnel is built in a large number.To the end of the year 2008, only the west area has just been built up 1961 of vcehicular tunnels, 1102871 linear meter(lin.m.)s, wherein 50 of super long tunnels, 240198 linear meter(lin.m.)s, 217 of long tunnels, 362684 linear meter(lin.m.)s.The vcehicular tunnel of growing up generally is provided with mechanical ventilator, and has wherein adopted the suspension type longitudinal ventilation with jetblower more than 95%, so the stability on the jet blower basis that hangs has obtained people's great attention day by day.
As shown in Figure 1, the mounting means of jet blower generally is first at tunnel vault pre-embedded steel slab, and steel plate and embedded bar are welded to connect, and then the blower fan mounting bracket are welded on the steel plate.According to relevant specification, blower fan will be made load carrying capacity test to supporting structure before hanging and installing, so, after the mounting bracket welding is finished, generally can make resistance to plucking and test built-in fitting and support, again blower fan is hung on the support after qualified.Because blower fan is heavier, and the certain vibrations of meeting generation that are in operation, the basis there is harmful effect unavoidably, so fan operation needs after a period of time the stability on built-in fitting basis is done to detect again.
Conventional detection mainly contains following three kinds: remake the resistance to plucking test, adopt radiographic inspection, adopt magnetic powder inspection.
And all there is defective in existing various detection method: (1) is made resistance to plucking and is tested, because the blower fan build is bigger, general diameter is all more than one meter, and the resistance to plucking test operation is very difficult under the mounted condition of blower fan, and observation is also very difficult.If blower fan unloaded remake resistance to plucking test, workload is bigger, and the test period is also long.(2) adopt radiographic inspection, in theory, this mode mainly detects the reliability that is connected between pre-embedded steel slab and the mounting bracket, and in fact the reliability that is connected between pre-embedded steel slab and the embedded bar is detected comparatively difficulty, and can not detect the loosening situation between embedded bar and the concrete.(3) magnetic powder inspection also mainly is the degree of impairment that detects welding support from present applicable cases, and is similar with radiographic inspection, can't detect the degree of impairment of the built-in fitting of most critical.
Summary of the invention
The purpose of this invention is to provide a kind of method and system that stability of foundation of fan suspended in road tunnel detects that is used for, this method can not only detect the stable case on built-in fitting basis, also can detect the failure condition of welding support, do not need to unload blower fan, can realize the on-line monitoring of equipment fully, realize that the system principle of this method is also simple, low production cost, in the process of the test system easy and simple to handle, test findings is intuitive and reliable, meets the needs that ensure the Road Tunnel Safety operation.
For achieving the above object, the present invention specifically explains a kind of method that stability of foundation of fan suspended in road tunnel detects that is used for, and it is characterized in that, carries out as follows:
(A) obtain canonical reference information: earlier built-in fitting is done the resistance to plucking test, on the built-in fitting that satisfies the resistance to plucking test, jet blower is installed, make primary detection then;
Its detection method is: at least one vibration transducer is set on the test point of blower fan built-in fitting, measure and write down the vibration situation of blower fan built-in fitting from start to the whole process of even running, analyze and generate the variation tendency of time domain waveform, signal spectrum and the signal of detection signal by the data analysis disposal system, analysis result is noted as canonical reference information;
(B) obtain detecting information: behind the fan operation certain hour, test point to primary detection detects once more, the vibration situation of test and record blower fan built-in fitting from start to the whole process of even running, analyze and generate the variation tendency of time domain waveform, signal spectrum and the signal of detection signal by the data analysis disposal system, with analysis result as detecting information;
(C) judge relatively: the detecting information of step (B) gained and the canonical reference information of step (A) gained are compared, if satisfy one of predetermined criterion, it is loosening to judge that then the built-in fitting basis occurs.
Judge in the described step (C) that the built-in fitting basis loosening criterion occurs and comprises:
(a) time domain waveform becomes the overlaid waveforms of fundamental frequency, fractional harmonic and higher hamonic wave;
(b) fractional harmonic of fundamental frequency has appearred in characteristic frequency;
(c) normal companion's frequency has 1.5 frequencys multiplication, 2 frequencys multiplication, 3 frequencys multiplication, N frequency multiplication in the signal spectrum, and described N is the integer greater than 3;
(d) continuous frequency spectrum appears in the signal spectrum sometimes;
(e) at the rotation speed of fan change procedure, the phenomenon that the appearance of the amplitude of time domain plethysmographic signal increases suddenly or reduces;
(f) at the rotation speed of fan change procedure, significant change appears in the amplitude of built-in fitting basis mechanical vibration.
Described test point comprises the pre-embedded steel slab that is connected on the embedded bar, be welded on the mounting bracket on the pre-embedded steel slab and be fixed on jet blower (A3) on the mounting bracket (A2).
Adopt this method that stability of foundation of fan suspended in road tunnel is detected, do not need to take off heavy Fan Equipment, can not influence the normal operation of miscellaneous equipment yet, testing process is convenient and swift, only need the vibration transducer in the detection system is installed on the test point, detect and the vibration situation of record blower fan from start to the whole process of even running, handle the time domain waveform that software generates detection signal by systematic analysis then, information such as frequency spectrum and variation tendency, last and canonical reference information compares and gets final product, as long as it is loosening that the built-in fitting basis occurs, all significant difference can appear between detected various information and the canonical reference information.This method not only can detect the failure condition of welding support, also can detect the loosening situation between pre-embedded steel slab and embedded bar and embedded bar and the concrete, and with respect to existing several detection methods, the reliability of testing result is stronger.
The present invention also explains a kind of system that is used to realize described stability of foundation of fan suspended in road tunnel detection method, the involving vibrations sensor, its key is: described vibration transducer is connected the input end of signal amplification circuit, the output terminal of this signal amplification circuit links to each other with filtering circuit, the output terminal of this filtering circuit is connected with the sample quantization circuit, the output terminal of described sample quantization circuit is connected with the CPU central controller, the input end of described CPU central controller also is connected with keyboard, the output terminal of this CPU central controller is connected with display, this cpu controller also disposes data storage cell and usb circuit, and described USB interface connects analysis processing computer.Extract the various detection information of storing in the data storage cell by the signal analysis and processing software that disposes in the analysis processing computer, generate time domain plethysmographic signal figure, signal spectrum figure, signal energy changing trend diagram etc. intuitively by signal analysis and processing, make things convenient for the contrast of staff and canonical reference information.
Described vibration transducer is displacement transducer and/or speed pickup and/or acceleration transducer, be used to respond to the vibration situation of sample point, and mechanical momentum is converted to the electric signal amount, the detected little electric signal amount of vibration transducer is sent to filtering circuit after signal amplification circuit amplifies, the various undesired signals of described filtering circuit filtering, turning to the digital signal amount through the sample quantization amount of circuitry then sends in the CPU central controller, described CPU central controller is used to coordinate the work of each several part circuit, keyboard is used to import various steering orders, display can the display device duty and the output information, make things convenient for staff's operation, system provides data storage cell for oneself, can store the detection data temporarily, be convenient to the offline inspection of system,, realize data transmission with analysis processing computer by configuration usb data interface, described analysis processing computer disposes signal analysis and processing software, is used for generating the time domain waveform of detection signal, frequency spectrum and variation tendency.
Remarkable result of the present invention is: the failure condition that can not only detect welding support, also can detect between pre-embedded steel slab and the embedded bar and the loosening situation between embedded bar and the concrete, do not need to unload blower fan in the process of the test, do not influence the operation of equipment fully yet, the system principle of realizing this method is simple, low production cost, system easy and simple to handle, test findings is intuitive and reliable, meets the needs that ensure the Road Tunnel Safety operation.
Description of drawings
Fig. 1 is a vcehicular tunnel fan installing structure synoptic diagram;
Fig. 2 is a system architecture block scheme of the present invention;
Fig. 3 is that system detects built-in fitting vibration of foundation spectrum signature figure under the normal condition among the embodiment;
Fig. 4 is that system detects built-in fitting vibration of foundation spectrum signature figure under the loosening situation among the embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
As shown in Figure 1, the built-in fitting of fan suspended in road tunnel comprises the embedded bar (A0) that is arranged in the xoncrete structure, be welded on the pre-embedded steel slab (A1) on the embedded bar (A0), and be welded on mounting bracket (A2) on the pre-embedded steel slab (A1), go up with bolt jet blower (A3) at described mounting bracket (A2).
Fan suspended built-in fitting stability of foundation is detected, carries out according to following steps:
(A) obtain canonical reference information: earlier built-in fitting is done the resistance to plucking test, described built-in fitting satisfies the resistance to plucking testing requirements, guarantees after each parts connection is stablized jet blower (A3) to be installed again, makes primary detection then;
Its detection method is: vibration transducer is fixed on the pre-embedded steel slab (A1), measure and the vibration situation of record jet blower (A3) from start to the whole process of even running, handle software analysis and generate signal spectrum as canonical reference information by systematic analysis;
As shown in Figure 3, obtain built-in fitting vibration of foundation spectrum signature under the normal condition.
(B) obtain detecting information: behind the fan operation certain hour (time between overhauls(TBO)), test point to primary detection detects once more, the vibration situation of test and record blower fan built-in fitting from start to the whole process of even running, the signal spectrum of being handled software analysis and being generated detection signal by systematic analysis is as detecting information;
As shown in Figure 4, obtain one of the rumble spectrum feature of built-in fitting base flexible situation.
(C) judge relatively: the detecting information of step (B) gained and the canonical reference information of step (A) gained are compared.
As shown in Figure 3, built-in fitting vibration of foundation spectrum signature under the normal condition, energy mainly concentrates on fundamental frequency f0, perhaps, 2 frequencys multiplication and 3 frequencys multiplication are arranged, but energy is lower, and when taking place to detect once more under the loosening situation on the basis, as shown in Figure 4, normal companion occurs frequently and has showed mark frequency and 4 frequencys multiplication in the built-in fitting vibration of foundation spectrum signature of record, and the also significantly rising of the energy of 2 frequencys multiplication and 3 frequencys multiplication, so can judge that the built-in fitting at check point place has occurred loosening or crackle has appearred in the mounting bracket weld seam.
As shown in Figure 2, be used to realize the system of described stability of foundation of fan suspended in road tunnel detection method, vibration transducer 1 adopts speed pickup, this vibration transducer 1 is connected the input end of signal amplification circuit 2, the output terminal of this signal amplification circuit 2 links to each other with filtering circuit 3, the output terminal of this filtering circuit 3 is connected with sample quantization circuit 4, the output terminal of described sample quantization circuit 4 is connected with CPU central controller 5, the input end of described CPU central controller 5 also is connected with keyboard 6, the output terminal of this CPU central controller 5 is connected with display 7, this CPU central controller 5 also disposes data storage cell 8 and usb circuit, and described USB interface connects analysis processing computer 9.
Described analysis processing computer 9 disposes the data analysis disposal system, this data analysis disposal system is extracted the data message stream that vibration transducer 1 is induced, signal spectrum figure as shown in Figure 3, Figure 4 can be generated, time domain plethysmographic signal figure and signal changing trend diagram can also be generated.
Principle of work of the present invention is:
Adopt native system that stability of foundation of fan suspended in road tunnel is detected, time domain plethysmographic signal figure, signal spectrum figure that will generate in the time of directly will detecting or signal changing trend diagram and the contrast of original canonical reference information, if satisfy criterion, judge that then the built-in fitting stability of foundation goes wrong.
Although above system is described the preferred embodiments of the present invention in conjunction with the accompanying drawings; but the invention is not restricted to above-mentioned embodiment; above-mentioned embodiment only is schematic rather than determinate; those of ordinary skill in the art is under the enlightenment of present embodiment; under the prerequisite of aim of the present invention and claim; can make multiple similar expression; as change the position of the kind of vibration transducer and quantity, change test point and select different indexs as criterion etc., such conversion all falls within protection scope of the present invention.
Claims (4)
1. one kind is used for the method that stability of foundation of fan suspended in road tunnel detects, and it is characterized in that: carry out as follows:
(A) obtain canonical reference information: earlier built-in fitting is done the resistance to plucking test, on the built-in fitting that satisfies the resistance to plucking test, jet blower is installed, make primary detection then;
Its detection method is: at least one vibration transducer is set on the test point of blower fan built-in fitting, measure and write down the vibration situation of blower fan built-in fitting from start to the whole process of even running, analyze and generate the variation tendency of time domain waveform, signal spectrum and the signal of detection signal by the data analysis disposal system, the record analysis result is as canonical reference information;
(B) obtain detecting information: behind the fan operation certain hour, test point to primary detection detects once more, the vibration situation of test and record blower fan built-in fitting from start to the whole process of even running, analyze and generate the variation tendency of time domain waveform, signal spectrum and the signal of detection signal by the data analysis disposal system, the record analysis result is as detecting information;
(C) judge relatively: step (B) detecting information that is write down and the canonical reference information that step (A) is write down are compared,, judge that then becoming flexible appears in the built-in fitting basis if satisfy one of following predetermined criterion:
(a) time domain waveform becomes the overlaid waveforms of fundamental frequency, fractional harmonic and higher hamonic wave;
(b) fractional harmonic of fundamental frequency has appearred in characteristic frequency;
(c) normal companion's frequency has 1.5 frequencys multiplication, 2 frequencys multiplication, 3 frequencys multiplication, N frequency multiplication in the signal spectrum, and described N is the integer greater than 3;
(d) in the signal spectrum continuous frequency spectrum appears;
(e) at the rotation speed of fan change procedure, the phenomenon that the appearance of the amplitude of time domain plethysmographic signal increases suddenly or reduces;
(f) at the rotation speed of fan change procedure, significant change appears in the amplitude of built-in fitting basis mechanical vibration.
2. a kind of method that stability of foundation of fan suspended in road tunnel detects that is used for according to claim 1 is characterized in that: described test point comprises the pre-embedded steel slab (A1) that is connected on the embedded bar (A0), be welded on the mounting bracket (A2) on the pre-embedded steel slab (A1) and be fixed on jet blower (A3) on the mounting bracket (A2).
3. stability of foundation of fan suspended in road tunnel detection system that realizes the described method of claim 1, involving vibrations sensor (1), it is characterized in that: described vibration transducer (1) is connected the input end of signal amplification circuit (2), the output terminal of this signal amplification circuit (2) links to each other with filtering circuit (3), the output terminal of this filtering circuit (3) is connected with sample quantization circuit (4), the output terminal of described sample quantization circuit (4) is connected with CPU central controller (5), the input end of described CPU central controller (5) also is connected with keyboard (6), the output terminal of this CPU central controller (5) is connected with display (7), this cpu controller (5) also disposes data storage cell (8) and usb circuit, described USB interface connects analysis processing computer (9), described analysis processing computer (9) disposes the data analysis disposal system, is used to generate the time domain waveform figure of detection signal, the changing trend diagram of signal spectrum figure and signal.
4. the system that is used for the stability of foundation of fan suspended in road tunnel detection according to claim 3, it is characterized in that: described vibration transducer (1) is displacement transducer and/or speed pickup and/or acceleration transducer.
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| CN2010101151477A CN101787715B (en) | 2010-02-26 | 2010-02-26 | Method used for testing stability of foundation of fan suspended in road tunnel and system therefor |
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| CN2010101151477A CN101787715B (en) | 2010-02-26 | 2010-02-26 | Method used for testing stability of foundation of fan suspended in road tunnel and system therefor |
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| CN103510975B (en) * | 2012-06-18 | 2016-06-22 | 上海市政工程设计研究总院（集团）有限公司 | A kind of fan suspension method for shield tunnel |
| CN104849010B (en) * | 2015-05-28 | 2018-03-16 | 江阴众和电力仪表有限公司 | A kind of jet blower vibration is with loosening exciter test platform |
| CN105043729B (en) * | 2015-06-25 | 2017-12-15 | 中铁第四勘察设计院集团有限公司 | A kind of monitoring and pre-warning method and system of suspension equipment looseness fault |
| CN105019482B (en) * | 2015-07-15 | 2016-12-07 | 招商局重庆交通科研设计院有限公司 | A kind of for tunnel stability of foundation of fan suspended on-line monitoring method and system |
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| CN110579412B (en) * | 2019-09-10 | 2022-03-11 | 重庆大学 | Method for laying stability detection positions of fan foundations of highway tunnel |
| CN112284512A (en) * | 2020-10-16 | 2021-01-29 | 陕西宝鸡第二发电有限责任公司 | Capacitive vibration sensor and power plant fan diagnosis system and method |
| CN112539935B (en) * | 2020-11-25 | 2022-10-14 | 西安因联信息科技有限公司 | Method for identifying basic faults of rotating machinery |
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| DE4232794A1 (en) * | 1992-09-30 | 1994-03-31 | Pohle & Rehling Gmbh | Tightness tester for mine and tunnel air ducts - has fan with associated sheet metal duct member with duct coupling flange |
| JP2001324420A (en) * | 2000-05-17 | 2001-11-22 | Mitsubishi Heavy Ind Ltd | Method and device for predicting oscillation of blades in rotating machine |
| CN1241005C (en) * | 2002-08-28 | 2006-02-08 | 联想(北京)有限公司 | Vibration detecting method of heat radiator and its detecting system |
| TWI283738B (en) * | 2006-05-22 | 2007-07-11 | Delta Electronics Inc | Cooling fan test method and apparatus thereof |
| CN100564805C (en) * | 2007-12-27 | 2009-12-02 | 上海市城市建设设计研究院 | Jetting flow blower fan suspension system anchoring piece and use the suspension of this anchoring piece |
| CN101545824B (en) * | 2008-03-25 | 2013-08-14 | 唐德尧 | Fault diagnosis technology for mechanical tower |
| CN201251564Y (en) * | 2008-05-12 | 2009-06-03 | 西安西科测控设备有限责任公司 | Device for monitoring stability of roof strata or concrete structure of well in real-time |
| CN101354315A (en) * | 2008-09-05 | 2009-01-28 | 爱立迈科（宁波）计测仪器有限公司 | Device and method for tracking and detecting engine state based on vibration signal |
| CN101393444B (en) * | 2008-10-31 | 2014-05-07 | 上海华魏自动化设备有限公司 | Combined monitoring system |
| CN201351621Y (en) * | 2009-01-04 | 2009-11-25 | 浙江金盾风机风冷设备有限公司 | Axial flow fan with vibration measuring device |
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