CN104849010A - Jet fan vibration and loosening excitation test bench - Google Patents
Jet fan vibration and loosening excitation test bench Download PDFInfo
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- CN104849010A CN104849010A CN201510280685.4A CN201510280685A CN104849010A CN 104849010 A CN104849010 A CN 104849010A CN 201510280685 A CN201510280685 A CN 201510280685A CN 104849010 A CN104849010 A CN 104849010A
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Abstract
The present invention relates to a jet fan vibration and loosening excitation test bench which is characterized in that the test bench comprises a platform wind tunnel (1), a jet fan (2), a jet fan control cabinet (3), a blower (4), a blower control cabinet (5), a data acquisition and analysis system (6), a vibration sensor (7), and a wind speed sensor (8). The jet fan is lifted at the top of the platform wind tunnel, and a jet fan field installation environment is simulated. The jet fan control cabinet is used for the starting, stopping and programmed controlling of the jet fan. The blower is installed at the air inlet of the wind tunnel, and the height of the blower can be adjusted. The jet fan control cabinet is used for controlling the jet fan, and through the programmed control device of the jet fan control cabinet, the air input of the wind channel is automatically adjusted. The wind speed sensor measures the wind speech (airflow) in the wind channel and sends a wind speed signal as a feedback to the jet fan control cabinet, and the closed-loop control of the wind tunnel airflow is realized. According to the test requirements, stable closed-loop control airflow is formed, and the airflow excitation of the jet fan is carried out. The jet fan vibration and loosening excitation test bench is used for researching the jet fan vibration and loosening warning judgment method in a tunnel.
Description
Technical field
The present invention relates to the test bed of a kind of jet blower looseness fault, in particular to equipment securing members such as a kind of jet blower operational process medium-height trestle, bases, cause the test of looseness fault, test and verification method by operational shock own and flow-induced vibration effect.
Background technology
Jet blower is a kind of special axial flow blower, is mainly used in, in the longitudinal exhausting system in the tunnels such as highway, railway and subway, as the import and export in tunnel, playing the effect such as induced draft or smoke evacuation.Due to ventilation function and the effect requirements of jet blower, most jet blower installation site, at tunnel top, is arranged in directly over tunnel highway, track.Jet blower is for a long time by self-operating vibration and flow-induced vibration, installing set bolt easily produces loosening, blower fan is once occur that blower fan loosens, not easily for maintenance person discovers, also do not have early warning and alarming equipment, therefore current device safeguards the regular manual inspection of dependence, efficiency is low, correctness is poor, can not early warning in time, cause huge artificial burden.Do not have timely early warning if blower fan loosens and reinforce, it will threaten the vehicles and passenger's life safety of below constantly, and the collision automobile that drops, train will cause a serious accident.
Jet blower is under various working or factor, and constantly vibration causes mounting structure to loosen, and show that rule or method can be monitored blower fan characteristic parameter and directly judge that blower fan loosens at present without any research.Conventional monitoring cannot judge that blower fan loosens, still need to simulate the operating mode of such application jet blower, constantly carry out the contrast test of normal condition and loosening state, and in conjunction with the multiple environmental impact such as operational shock, flow-induced vibration, carry out extraction and conclusion that jet blower loosens feature.The test bed of this jet blower looseness fault well provides this test condition, can be loosening early warning differentiation and provides good experimental basis.
Summary of the invention
The object of the invention is, the test bed of a kind of jet blower looseness fault is provided, the simulation of jet blower looseness fault under each working condition, test and checking can be realized.For studying in tunnel jet blower under self-operating vibration or the effect of train flow-induced vibration, vibration and the relation loosened, analyze under various abnormal vibration, each position loosen situation, the different characteristic that each measuring point shows, sums up the vibration of such tunnel jet blower and loosens the method that early warning judges.
For achieving the above object, the present invention takes following technical scheme: a kind of jet blower vibrates and loosens exciter test platform, comprise platform wind-tunnel (1), jet blower (2), jet blower switch board (3), fan blower (4), air compressor control cabinet (5), data acquisition and analysis system (6), vibration transducer (7), air velocity transducer (8), described jet blower (2) is lifted on the top of platform wind-tunnel (1), simulation jet blower in-site installation environment, described jet blower switch board (3) is for start and stop and program control jet blower (2), described fan blower (4) is installed on wind-tunnel (1) air inlet, fan blower (4) is Height Adjustable, described air compressor control cabinet (5) is for controlling fan blower (4), by the program control device of air compressor control cabinet (5), the air inflow of automatic adjustment wind-tunnel (1), air velocity transducer (8) measures the wind speed (air-flow) in wind-tunnel (1), and wind velocity signal is fed back to air compressor control cabinet (5), realize the closed-loop control of wind-tunnel (1) air-flow, stable closed loop control air-flow is formed according to test request, air-flow excitation is carried out to jet blower, operate voluntarily when jet blower (2) or be subject to gas shock, jet blower (2) produces vibration, the each vibration transducer (7) being installed on jet blower (2) body detects the vibration of each measuring point, data acquisition and analysis system (6) receives the vibration signal of each vibration transducer (7), analyzes the mode of jet blower (2).
Wind-tunnel (1) top is when using concreting, pre-buried one deck steel plate (9), jet blower fixed support (10) is fastened by bolts on pre-embedded steel slab (9), jet blower (2) is fastening by bolt (11) and fixed support, when jet blower is installed fastening, jet blower operates voluntarily or under airflow function, data acquisition and analysis system (6) carries out data acquisition and model analysis by the sensor of each measuring point of jet blower (2) body.
Testing table wind-tunnel adopts reinforced concrete structure, and the wind-tunnel degree of depth is blower fan length more than 3 times, and hole is square, and from air inlet to air outlet, upper and lower and both sides are closed, and can ensure the circulation of air-flow.
Testing table wind-tunnel adopts reinforced concrete structure, takes into full account assembling load-bearing, in tunnel ratio, designes and constructes.During construction, the pre-buried 10mm thickness steel plate in wind-tunnel top welds with reinforcement in concrete, ensures pre-embedded steel slab strength of joint, and a plane is formed on the final and wind-tunnel top of pre-embedded steel slab.Jet blower mounting bracket, is fastened by bolts to pre-embedded steel slab, and jet blower is then fastened by bolts on mounting bracket, ensures each installation restraint location adjustable-tightness.
Above-mentioned jet blower vibrates and loosens the method that exciter test platform carries out testing, by the program control device of air compressor control cabinet (5), the air inflow of automatic adjustment wind-tunnel (1), air velocity transducer (8) measures the wind speed (air-flow) in wind-tunnel (1), and wind velocity signal is fed back to air compressor control cabinet (5), realize the closed-loop control of wind-tunnel (1) air-flow, form stable closed loop control air-flow according to test request, air-flow excitation is carried out to jet blower; Operate voluntarily when jet blower (2) or be subject to gas shock, jet blower (2) produces vibration, the each vibration transducer (7) being installed on jet blower (2) body detects the vibration signal of each measuring point, data acquisition and analysis system (6) receives the vibration signal of each vibration transducer (7), analyzes the mode of jet blower (2).
Jet blower (2) self-operating, the interior airless excitation of wind-tunnel (1), loosen each fastening bolt (11), added up by the order to each bolt looseness, loosening quantity, loosening degree, analytic record is carried out, the characteristic modes loosened under obtaining this operating mode to loosening rear jet blower (2) mode.
Jet blower (2) does not run self, open fan blower (4), air-flow is produced in wind-tunnel (2), loosen each fastening bolt (11), added up by the order to each bolt looseness, loosening quantity, loosening degree, by the mode of exciting, analytic record is carried out to loosening front and back jet blower (2), the characteristic modes loosened under obtaining static fan airflow exciting.
Jet blower (2) self-operating, and open fan blower (4), air-flow is produced in wind-tunnel (2), loosen each fastening bolt (11), added up by the order to each bolt looseness, loosening quantity, loosening degree, by the mode of flow-induced vibration, analytic record is carried out to loosening front and back jet blower (2), obtains the characteristic modes loosened under running fan airflow exciting.
Jet blower as above, carries out controlling run or stopping by frequency-conversion control cabinet, and the air-flow in wind-tunnel realizes the adjustment of air-flow by air compressor control.During simulation, run at jet blower respectively and stop under two states, simulation air-flow grows out of nothing, each working condition tests from small to large, the modal characteristics of each operating mode under obtaining jet blower tightening state.Artificially regularly loosen each fastening bolt, repeat above-mentioned simulation steps, gather respectively lower each point loosen under modal characteristics, and time fastening with jet blower under identical operating mode, modal characteristics contrasts.
Data acquisition and analysis system as above, constantly gathers above-mentioned simulation test, learns, and progressively according to test situation, sets up looseness fault judgment models.During checking, input current operating condition at data acquisition and analysis system, loosen jet blower fastening bolt arbitrarily, whether inspection software model can determine looseness fault, if do not met, then and sophisticated model storehouse, and repeat simulation test.
Testing table wind-tunnel adopts reinforced concrete structure, takes into full account assembling load-bearing, in tunnel ratio, designes and constructes.During construction, the pre-buried 10mm thickness steel plate in wind-tunnel top welds with reinforcement in concrete, ensures pre-embedded steel slab strength of joint; Jet blower mounting bracket, is fastened by bolts to pre-embedded steel slab, and jet blower is then fastened by bolts on mounting bracket, ensures each installation restraint location adjustable-tightness.Jet blower is by frequency conversion tank drived control, and frequency conversion tank is positioned at wind-tunnel outside, by cable connection control.Jet blower body inlet and outlet arranges multiple vibration transducer respectively, the vibration acceleration of monitoring blower fan X, Y, Z-direction, install air velocity transducer in jet blower centre bottom, air-flow wind speed in monitoring wind-tunnel, each monitoring sensor is connected to data acquisition and analysis system by cable.
According to blower fan structure, design support, uses channel-section steel processing, can height up and down, and fan blower is fixed on support, regulates suitable position, is arranged in wind-tunnel air inlet.Fan blower carries out drived control by its frequency-conversion control cabinet, and receives air velocity transducer wind velocity signal, realizes wind speed and stablizes fine adjustment.
Beneficial effect of the present invention, the present invention can realize the simulation of jet blower looseness fault under each working condition, test and checking.And software model can be checked whether can to determine looseness fault, and if do not met, then sophisticated model storehouse, and repeat simulation test.
Accompanying drawing explanation
The test bed side view of Fig. 1 jet blower looseness fault;
The test bed front elevation of Fig. 2 jet blower looseness fault;
Fig. 3 jet blower installs enlarged drawing;
Fig. 4 experiment process figure.
Wherein: 1-wind-tunnel; 2-jet blower; 3-jet blower switch board; 4-fan blower; 5-air compressor control cabinet; 6-data acquisition and analysis system; 7-vibration transducer; 8-air velocity transducer; 9-pre-embedded steel slab; 10-jet blower mounting bracket; 11-fastening bolt, 12-air blower support.
Embodiment
Existing loosening detection technique mainly relies on piezoelectricity sensing element, direct-detection bolted position, and for the equipment fixed by multiple bolt, monitoring point quantity is many, and monitoring difficulty is large; Simultaneously not for the blower fan of this project application, the research loosened under carrying out various operating mode, therefore the present invention provides a test platform for designing research and development jet blower looseness fault early warning system.
See Fig. 1, Fig. 2, Fig. 3, jet blower of the present invention is test bed, be directed to the deficiency of existing detection experiment and the feature of object technology verification experimental verification, design comprises wind-tunnel (1), jet blower (2), jet blower support (10), fan blower (4), the parts such as air blower support (12), wind-tunnel as above (1) and ground thereof adopt reinforced concrete structure, jet blower support (10) is fastened to wind-tunnel top pre-embedded steel slab (9), jet blower is installed and is anchored on support, have many places can degree of tightness regulate bolt (11).When this mode is conveniently tested, different bolt degrees of tightness is tested, contrasted.
As above, fan blower is installed on its support, air blower support (12) can up-down adjustment, fan blower (4) is arranged in wind-tunnel air inlet, the air-flow of train through producing in simulation tunnel can be realized by air compressor control cabinet (5), the air velocity transducer (8) that jet blower body is installed can detect wind speed size, closed-loop control is formed through the collection of air compressor control cabinet, adjustment, control, can realize fine setting, program control, increase test completeness.
Jet blower as above (2) body, inlet and outlet top, side, mounting bracket is installed multiple vibration acceleration sensor (7), sensor can measure each measuring point spatial triaxial of blower fan to vibration acceleration, air velocity transducer (8) is installed in bottom, all the sensors is by the data acquisition and analysis system (6) in pulpit outside cable arrangement to wind-tunnel, and during test, fan vibration imports acquisition analysis system into by each sensor.
Acquisition analysis system as above (6), collecting part adopts high speed dynamic similation signals collecting, complete the conditioning to the vibration of blower fan each point all directions, amplification, filtering acquisition and analog to digital conversion, after vibration signal digitizing, enter software analysis system.Software analysis system carries out spectrum analysis, cross correlation analysis, energy density analysis of spectrum to each point vibration signal gathered, and finally completes the analysis of blower fan mode.
During test, simulation airless excitation situation, ensure that jet blower is installed fastening, fan blower stops, and jet blower starts, and to rated speed, (frequency is f to motor raising speed
0), because self rotates, fan body produces vibration to a certain degree.Now acquisition analysis system, is tested blower fan mode by each sensor, gathers, analyzes and record, and this is initial tightening state.Close jet blower, loosen jet blower fastening bolt according to certain rules successively, start jet blower, use acquisition analysis system repeatedly to gather, analyze, record each state of blower fan under mode attribute, this be airless blower fan dynamically loosening state.
During test, simulation air-flow excitation jet blower stopping situation, ensure that jet blower is installed fastening, open fan blower, stable regulation appropriate gas flow, now jet blower is due to air-flow excitation generation vibration to a certain degree.Now acquisition analysis system, is gathered blower fan mode by each sensor, analyzes and record, and this is initial tightening state.Close fan blower, loosen jet blower fastening bolt according to certain rules successively, start fan blower, use acquisition analysis system repeatedly to gather, analyze, record each state of blower fan under mode attribute, this is the static loosening state of the lower blower fan of air-flow excitation.
During test, the lower jet blower ruuning situation of simulation air-flow excitation, ensures that jet blower is installed fastening, open fan blower, stable regulation appropriate gas flow, opens jet blower and runs to rated speed, and now jet blower is due to air-flow excitation and self rotation generation vibration to a certain degree.Now acquisition analysis system, is gathered blower fan mode by each sensor, analyzes and record, and this is initial tightening state.Close fan blower and jet blower, loosen jet blower fastening bolt according to certain rules successively, start fan blower and jet blower, use acquisition analysis system repeatedly to gather, analyze, record each state of blower fan under mode attribute, this encourages the motor-driven state of leeward to loosen state for air-flow.
Repeatedly simulate testing as mentioned above, position is loosened by the various difference of each operating mode, the collection of blower fan mode attribute, analysis, record, sum up and loosen feature, sector-style of going forward side by side machine loosens the aspect of model storehouse of differentiation, constantly by test, checking, revises aspect of model storehouse, until there is higher resolution to the differentiation loosened, do not judge by accident simultaneously.The present invention, in conjunction with the multiple environmental impact such as operational shock, flow-induced vibration, carries out extraction and conclusion that jet blower loosens feature; Show that various difference loosens position, blower fan mode attribute rule, blower fan characteristic parameter can be monitored by this rule and directly judge that blower fan loosens.
Claims (8)
1. a jet blower vibrates and loosens exciter test platform, it is characterized in that, comprise platform wind-tunnel (1), jet blower (2), jet blower switch board (3), fan blower (4), air compressor control cabinet (5), data acquisition and analysis system (6), vibration transducer (7), air velocity transducer (8), described jet blower (2) is lifted on the top of platform wind-tunnel (1), simulation jet blower in-site installation environment, described jet blower switch board (3) is for start and stop and program control jet blower (2), described fan blower (4) is installed on wind-tunnel (1) air inlet, fan blower (4) is Height Adjustable, described air compressor control cabinet (5) is for controlling fan blower (4), by the program control device of air compressor control cabinet (5), the air inflow of automatic adjustment wind-tunnel (1), air velocity transducer (8) measures the wind speed (air-flow) in wind-tunnel (1), and wind velocity signal is fed back to air compressor control cabinet (5), realize the closed-loop control of wind-tunnel (1) air-flow, stable closed loop control air-flow is formed according to test request, air-flow excitation is carried out to jet blower, operate voluntarily when jet blower (2) or be subject to gas shock, jet blower (2) produces vibration, the each vibration transducer (7) being installed on jet blower (2) body detects the vibration of each measuring point, data acquisition and analysis system (6) receives the vibration signal of each vibration transducer (7), analyzes the mode of jet blower (2).
2. a kind of jet blower according to claim 1 vibrates and loosens exciter test platform, it is characterized in that, testing table wind-tunnel adopts reinforced concrete structure, the wind-tunnel degree of depth is blower fan length more than 3 times, hole is square, and from air inlet to air outlet, upper and lower and both sides are closed.
3. a kind of jet blower according to claim 1 vibrates and loosens exciter test platform, it is characterized in that, testing table wind-tunnel adopts reinforced concrete structure, take into full account assembling load-bearing, in tunnel ratio, design and construct, the pre-buried 10mm thickness steel plate in wind-tunnel top welds with reinforcement in concrete, ensure pre-embedded steel slab strength of joint, a plane is formed on the final and wind-tunnel top of pre-embedded steel slab, jet blower mounting bracket, is fastened by bolts to pre-embedded steel slab, and jet blower is then fastened by bolts on mounting bracket.
4. a kind of jet blower according to claim 1 vibrates and loosens exciter test platform, it is characterized in that, wind-tunnel (1) top is when using concreting, pre-buried one deck steel plate (9), jet blower fixed support (10) is fastened by bolts on pre-embedded steel slab (9), jet blower (2) is fastening by bolt (11) and fixed support, when jet blower is installed fastening, jet blower operates voluntarily or under airflow function, data acquisition and analysis system (6) carries out data acquisition and model analysis by the sensor of each measuring point of jet blower (2) body.
5. according to the jet blower vibration one of claim 1-4 Suo Shu with loosen the method that exciter test platform carries out testing, it is characterized in that, by the program control device of air compressor control cabinet (5), the air inflow of automatic adjustment wind-tunnel (1), air velocity transducer (8) measures the wind speed (air-flow) in wind-tunnel (1), and wind velocity signal is fed back to air compressor control cabinet (5), realize the closed-loop control of wind-tunnel (1) air-flow, form stable closed loop control air-flow according to test request, air-flow excitation is carried out to jet blower; Operate voluntarily when jet blower (2) or be subject to gas shock, jet blower (2) produces vibration, the each vibration transducer (7) being installed on jet blower (2) body detects the vibration signal of each measuring point, data acquisition and analysis system (6) receives the vibration signal of each vibration transducer (7), analyzes the mode of jet blower (2).
6. test method according to claim 5, it is characterized in that, jet blower (2) self-operating, the interior airless excitation of wind-tunnel (1), loosen each fastening bolt (11), being added up by the order to each bolt looseness, loosening quantity, loosening degree, carrying out analytic record, the characteristic modes loosened under obtaining this operating mode to loosening rear jet blower (2) mode.
7. the test method according to claim 5 or 6, it is characterized in that, jet blower (2) does not run self, open fan blower (4), produce air-flow in wind-tunnel (2), loosen each fastening bolt (11), added up by the order to each bolt looseness, loosening quantity, loosening degree, by the mode of exciting, analytic record is carried out to loosening front and back jet blower (2), the characteristic modes loosened under obtaining static fan airflow exciting.
8. the test method according to claim 5 or 6, it is characterized in that, jet blower (2) self-operating, open fan blower (4), produce air-flow in wind-tunnel (2), loosen each fastening bolt (11), added up by the order to each bolt looseness, loosening quantity, loosening degree, by the mode of flow-induced vibration, analytic record is carried out to loosening front and back jet blower (2), obtains the characteristic modes loosened under running fan airflow exciting.
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| CN105910793A (en) * | 2016-06-12 | 2016-08-31 | 哈尔滨工业大学深圳研究生院 | Active vibration grating capable of increasing atmosphere boundary layer wind tunnel turbulence level |
| CN106596025A (en) * | 2016-12-06 | 2017-04-26 | 招商局重庆交通科研设计院有限公司 | Highway tunnel hanging fan base stability detection method and system based on impulse response |
| CN112115556A (en) * | 2020-09-28 | 2020-12-22 | 重庆长安汽车股份有限公司 | In-vehicle vibration simulation analysis method based on finished vehicle start-stop working condition and storage medium |
| CN112284668A (en) * | 2020-12-10 | 2021-01-29 | 南昌航空大学 | Device and method for testing bolt loosening caused by multi-axis vibration load |
| CN112903228A (en) * | 2021-04-09 | 2021-06-04 | 南昌航空大学 | Magnetic force excitation bolt joint vibration failure experimental device and test method |
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| CN113398786A (en) * | 2021-06-04 | 2021-09-17 | 大连海事大学 | Jet flow mixing-increasing continuous control device based on wind speed sensor and working method |
| CN116952524A (en) * | 2023-09-18 | 2023-10-27 | 中国航空工业集团公司沈阳空气动力研究所 | High-speed wind tunnel dynamic derivative test monitoring method, electronic equipment and storage medium |
| CN109580158B (en) * | 2018-12-29 | 2024-03-26 | 北京航天益森风洞工程技术有限公司 | Elevator operation simulation wind tunnel equipment |
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| CN109580158B (en) * | 2018-12-29 | 2024-03-26 | 北京航天益森风洞工程技术有限公司 | Elevator operation simulation wind tunnel equipment |
| CN112115556A (en) * | 2020-09-28 | 2020-12-22 | 重庆长安汽车股份有限公司 | In-vehicle vibration simulation analysis method based on finished vehicle start-stop working condition and storage medium |
| CN112284668A (en) * | 2020-12-10 | 2021-01-29 | 南昌航空大学 | Device and method for testing bolt loosening caused by multi-axis vibration load |
| CN112903228A (en) * | 2021-04-09 | 2021-06-04 | 南昌航空大学 | Magnetic force excitation bolt joint vibration failure experimental device and test method |
| CN113398786A (en) * | 2021-06-04 | 2021-09-17 | 大连海事大学 | Jet flow mixing-increasing continuous control device based on wind speed sensor and working method |
| CN113358214A (en) * | 2021-08-10 | 2021-09-07 | 陕西高速电子工程有限公司 | Fault detection method for jet fan structural body and related equipment |
| CN116952524A (en) * | 2023-09-18 | 2023-10-27 | 中国航空工业集团公司沈阳空气动力研究所 | High-speed wind tunnel dynamic derivative test monitoring method, electronic equipment and storage medium |
| CN116952524B (en) * | 2023-09-18 | 2023-12-05 | 中国航空工业集团公司沈阳空气动力研究所 | High-speed wind tunnel dynamic derivative test monitoring method, electronic equipment and storage medium |
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