CN113049081A - Fan operation tool test method and test system - Google Patents
Fan operation tool test method and test system Download PDFInfo
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- CN113049081A CN113049081A CN201911373856.2A CN201911373856A CN113049081A CN 113049081 A CN113049081 A CN 113049081A CN 201911373856 A CN201911373856 A CN 201911373856A CN 113049081 A CN113049081 A CN 113049081A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a fan operation tool test method and a system, wherein the method comprises the following steps: analyzing the natural frequency of the tool sample; setting a frequency comparison threshold; and comparing the natural frequency of the tool sample with the rated working frequency of the fan, judging whether the difference value of the natural frequency and the rated working frequency of the fan exceeds a threshold value, and if not, determining that the tool sample meets the requirement. The system comprises: a natural frequency analysis module: the device is used for analyzing the natural frequency of the tool to be verified; a frequency comparison module: the device is used for comparing the inherent frequency of the tool with the rated working frequency of the fan; a tool diagnosis module: and the device is used for generating a tool test diagnosis signal according to the difference value obtained by the frequency comparison module. By adopting the method and the system provided by the invention, whether the tool meets the design requirement or not can be automatically analyzed, and the research and development of the fan tool can be guided.
Description
Technical Field
The invention relates to the technical field of tool design, in particular to a test method and a test system for a fan operation tool.
Background
After the fan product is produced and manufactured, an operation vibration test is required to be carried out according to JB/T8689, and the fan is required to be directly fastened on a solid test bed base according to the test standard requirement so as to realize rigid support. However, because the mounting structures of each fan are different, the fan and the base are often connected by means of a tool, a designer designs a corresponding tool according to own experience and then directly puts the corresponding tool into production and use, and the resonance problem is easily caused by the fact that the inherent frequency of a system (base-tool-fan) is close to or coincided with the working frequency of the fan due to the problem of the rigidity of the tool during use. In the prior art, whether the design of the tool meets the requirement is verified through a trial-manufacture experiment, and the method is low in efficiency.
Disclosure of Invention
The invention aims to provide a test method and a test system of a fan operation tool, which are used for assisting in researching the reliability of the design of the fan operation tool and guiding the trial production of the fan operation tool.
In order to achieve the purpose, the invention adopts the technical scheme that:
the test method of the fan operation tool comprises the following steps:
analyzing the natural frequency of the tool sample;
setting a frequency comparison threshold;
and comparing the natural frequency of the tool sample with the rated working frequency of the fan, judging whether the difference value of the natural frequency and the rated working frequency of the fan exceeds a threshold value, and if not, determining that the tool sample meets the requirement.
Preferably, the test method further comprises the steps of:
installing a fan on the tool;
supplying power to the fan, and changing the power supply frequency of the fan;
under each power supply frequency, acquiring vibration speeds of a fixed position on the fan in three directions of an X axis, a Y axis and a Z axis;
and judging whether the vibration in the three directions has resonance under the rated working frequency of the fan, and if not, determining that the tool sample meets the requirements.
Preferably, the method for supplying power to the fan comprises the following steps:
setting a power supply reference frequency;
and selecting the power supply frequency at fixed step intervals in the range of the positive and negative power supply reference frequency by taking the rated working frequency of the fan as a standard.
Preferably, the range reference frequency is set, and further, after vibration speeds in three directions are obtained, whether resonance exists in the range of the positive reference frequency and the negative reference frequency of the rated working frequency of the fan is judged by taking the rated working frequency of the fan as a reference, and if not, the tool sample is considered to be in accordance with the requirement.
Preferably, the fixed position is selected as a fan bearing, and other mounting points can be selected according to needs.
The invention further provides a fan operation tool test system, which is characterized by comprising:
a natural frequency analysis module: the device is used for analyzing the natural frequency of the tool to be verified;
a frequency comparison module: the device is used for comparing the inherent frequency of the tool with the rated working frequency of the fan;
a tool diagnosis module: and the device is used for generating a tool test diagnosis signal according to the difference value obtained by the frequency comparison module.
Preferably, the tool testing system further comprises:
vibration sensor: the vibration data acquisition device is arranged on the fan and used for acquiring vibration data of the fan in three axial directions;
the tooling diagnosis module is further used for: and judging whether the vibration of the fan in the three directions has resonance under the rated working frequency of the fan or not, and generating a tool test diagnosis signal.
Preferably, the vibration sensor is mounted at a fan bearing.
Preferably, the test system and the set range reference frequency, and the tool diagnosis module further generates a tool test diagnosis signal according to whether the vibration in the three directions has resonance in the range of the reference frequency of the positive and negative ranges of the rated frequency of the fan.
Compared with the prior art, the fan operation tool test method and the test system provided by the invention have the main advantages that:
the automatic analysis of the tool can be realized, the tool research and development can be guided, and the development period can be shortened. Specifically, the excitation frequency of the system is changed by comparing the fan frequency with the tool frequency and further changing the type of the fan power supply frequency, and the corresponding three-direction vibration speed values are measured and the curve is drawn at the same time to confirm the resonance peak value, so that the qualification of the tool design is judged, and the verification is accurate and convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a vibration curve diagram obtained by a test method of a fan operation tool according to the present invention;
FIG. 2 is a flow chart of a fan operation tool test method of the present invention;
in the above figures:
1-X axial vibration; 2-Y axial vibration; 3-Z axial vibration.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a fan operation tool test method, which obtains a verification structure of tool reliability by analyzing tool frequency and fan frequency and is further used for guiding the design of a fan tool.
The fan operation tool test method, with reference to the flow chart shown in FIG. 2, comprises the following steps:
s1: analyzing the natural frequency of the tool sample; the tool sample is designed by a product designer according to experience in combination with the characteristics of the fan and is intended to be suitable for the fan; the natural frequency of the tool can be obtained by adopting an analysis method in the prior art, and the natural frequency does not belong to the innovative content of the invention and is not described in detail.
S2: setting a frequency comparison threshold; the comparison threshold value is a set frequency value, and the value is used for judging the difference between the inherent frequency of the tool and the rated frequency of the fan; in this embodiment, the comparison threshold is set to 5 Hz.
S3: and comparing the natural frequency of the tool sample with the rated working frequency of the fan, judging whether the difference value of the natural frequency and the rated working frequency of the fan exceeds a threshold value, and if not, determining that the tool sample meets the requirement. Specifically, the rated working frequency of the fan is determined by the characteristics of a motor of the fan and the like, and once the fan is manufactured, the rated working frequency of the fan is determined and belongs to the performance index of the fan. If the difference between the natural frequency of the tool and the rated frequency of the fan is outside the range of +/-5 Hz, the designed tool is considered to be in accordance with the specification.
Furthermore, after the tool is judged to be in accordance with the standard, the trial production of the tool can be carried out, and the test method further comprises the following steps:
s4: installing a fan on a pre-manufactured tool sample;
s5: supplying power to the fan, and changing the power supply frequency of the fan; specifically, the fan can be powered by the frequency converter; the specific method for supplying power to the fan comprises the following steps: setting a power supply reference frequency; and selecting the power supply frequency at fixed step intervals in the range of the positive and negative power supply reference frequency by taking the rated working frequency of the fan as a standard. Specifically, in this embodiment, the power supply reference frequency is set to be 10Hz, and the rated operating frequency of the fan is set to be 27Hz, which requires that the power supply frequency of the frequency converter is at least 17-37 Hz. Selecting a power supply frequency at fixed step intervals within a power supply frequency range; the rated working frequency of the fan is set to be 27Hz, the fan is powered by adopting the frequencies of 17Hz, 18Hz and 19Hz … … 37Hz by taking 1Hz as step length from 17 Hz. In actual test, the power supply reference frequency can be selected and set according to needs.
S6: under each power supply frequency, acquiring vibration speeds of a fixed position on the fan in three directions of an X axis, a Y axis and a Z axis; in the embodiment, the vibration speed of the fan bearing is collected; the vibration speeds of the fan bearing in the X-axis direction, the Y-axis direction and the Z-axis direction are respectively collected under the power supply frequencies of 17Hz, 18Hz and 19Hz … … 37 Hz.
S7: and judging whether the vibration in the three directions has resonance under the rated working frequency of the fan, and if not, determining that the tool sample meets the requirements. Referring specifically to fig. 1, a vibration curve is obtained by using the power supply frequency as an abscissa and using the vibration speed of the X-axis (horizontal direction, parallel to the ground, and perpendicular to the axial direction of the fan), the vibration speed of the Y-axis (axial direction of the fan, on the same plane as the horizontal direction, and along the direction of the motor shaft), and the vibration speed of the Z-axis (vertical direction) as ordinates. If no resonance peak exists between the three curves and the fan under the rated frequency of the fan (27 Hz in the embodiment), the tool sample is considered to be in accordance with the requirement.
In step S7, further, after the range reference frequency is set, and the vibration speeds in the three directions are obtained, it is determined whether resonance exists in the range of the positive and negative reference frequencies of the rated operating frequency of the fan with reference to the rated operating frequency of the fan, and if not, the tool sample is determined to meet the requirements. For example, in this embodiment, if the range reference frequency is set to be 5Hz, it is further observed whether the three curves have a resonance peak value within a range of ± 5Hz of the rated operating frequency of the fan, and the tool design is considered to meet the requirements.
Specifically, with reference to fig. 1, if the rated operating frequency of the fan is 27Hz, it is necessary to observe whether a resonance peak exists in a range of 22 to 32Hz in three directions. The peak value of the X-direction vibration 1 is 21.5Hz and is not in the range of 22-32 Hz, the peak value of the Y-direction vibration 2 is 21.5Hz and is not in the range of 22-32 Hz, and the peak value of the Z-direction vibration 3 is 25.5Hz and is in the range of 22-32 Hz. And then, the tool is considered not to meet the use requirement. If the vibration frequency of the fan does not have a peak value within the range of 22-32 Hz, the tool is considered to meet the use requirement.
The invention further provides a fan operation tool test system, which is realized based on a processor host, wherein the processor host carries a test system program, and the test system program comprises the following steps:
a natural frequency analysis module: the device is used for analyzing the natural frequency of the tool to be verified;
a frequency comparison module: the device is used for comparing the inherent frequency of the tool with the rated working frequency of the fan, and specifically, the inherent frequency of the tool is different from the rated working frequency of the fan;
a tool diagnosis module: and the device is used for generating a tool test diagnosis signal according to the difference value obtained by the frequency comparison module. And comparing the threshold value with the stored tool diagnosis module, and judging that the tool meets the requirement if the difference value between the natural frequency and the rated frequency of the fan is within the range of the comparison threshold value.
Still further, the tooling test system further comprises:
vibration sensor: the vibration data acquisition device is arranged on the fan and used for acquiring vibration data of the fan in three axial directions; specifically, in order to accurately collect vibration at the fan bearing, the vibration sensor is installed at the fan bearing and collects vibration data in the X direction, the Y direction and the Z direction at the fan bearing.
The tool diagnosis module is further used for: and judging whether the vibration of the fan in the three directions has resonance under the rated working frequency of the fan or not, and generating a tool test diagnosis signal. Specifically, the tool diagnosis module may generate a vibration curve as shown in fig. 1, and may further generate a tool test diagnosis signal according to whether the vibrations in the three directions have resonance within the range of the reference frequency of the positive and negative ranges of the rated frequency of the fan through a test system and a set range reference frequency. If no resonance exists, the tool meets the design requirements.
The system and the method provided by the invention improve the verification method of the fan operation vibration tool, change the excitation frequency of the system by changing the type of the fan power supply frequency, measure the corresponding three-direction vibration speed values and draw a curve at the same time to confirm the resonance peak value so as to judge the qualification of the tool design. The automatic analysis of the tool can be realized, the tool research and development can be guided, and the development period can be shortened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The test method of the fan operation tool is characterized by comprising the following steps:
analyzing the natural frequency of the tool sample;
setting a frequency comparison threshold;
and comparing the natural frequency of the tool sample with the rated working frequency of the fan, judging whether the difference value of the natural frequency and the rated working frequency of the fan exceeds a threshold value, and if not, determining that the tool sample meets the requirement.
2. The fan operation tool test method of claim 1, further comprising the steps of:
installing a fan on the tool;
supplying power to the fan, and changing the power supply frequency of the fan;
under each power supply frequency, acquiring vibration speeds of a fixed position on the fan in three directions of an X axis, a Y axis and a Z axis;
and judging whether the vibration in the three directions has resonance under the rated working frequency of the fan, and if not, determining that the tool sample meets the requirements.
3. The fan operation tool test method of claim 2, wherein the method for supplying power to the fan comprises the following steps:
setting a power supply reference frequency;
and selecting the power supply frequency at fixed step intervals in the range of the positive and negative power supply reference frequency by taking the rated working frequency of the fan as a standard.
4. The fan operation tool test method according to claim 2, wherein a range reference frequency is set, and further, after vibration speeds in three directions are obtained, whether resonance exists in the range of the positive reference frequency and the negative reference frequency of the fan rated operation frequency is judged by taking the fan rated operation frequency as a reference, and if not, the tool sample is considered to meet the requirements.
5. The fan operation tool test method of claim 2, wherein the fixed position is selected to be a fan bearing.
6. The utility model provides a fan operation frock test system which characterized in that includes:
a natural frequency analysis module: the device is used for analyzing the natural frequency of the tool to be verified;
a frequency comparison module: the device is used for comparing the inherent frequency of the tool with the rated working frequency of the fan;
a tool diagnosis module: and the device is used for generating a tool test diagnosis signal according to the difference value obtained by the frequency comparison module.
7. The fan operation tool testing system of claim 6, wherein the tool testing system further comprises:
vibration sensor: the vibration data acquisition device is arranged on the fan and used for acquiring vibration data of the fan in three axial directions;
the tooling diagnosis module is further used for: and judging whether the vibration of the fan in the three directions has resonance under the rated working frequency of the fan or not, and generating a tool test diagnosis signal.
8. The fan operating tool testing system of claim 7, wherein the vibration sensor is mounted at a fan shaft.
9. The fan operation tool test system of claim 7, wherein the test system sets a range reference frequency, and the tool diagnosis module further generates a tool test diagnosis signal according to whether the vibration in three directions has resonance in a range of the fan rated frequency plus or minus range reference frequency.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030175125A1 (en) * | 2002-03-16 | 2003-09-18 | Kye-Si Kwon | Operation control method of reciprocating compressor |
| CN102567578A (en) * | 2011-12-20 | 2012-07-11 | 北京卫星环境工程研究所 | Spacecraft vibration test fixture evaluation system |
| CN103575493A (en) * | 2013-11-04 | 2014-02-12 | 株洲南车时代电气股份有限公司 | Device and method for appraising vibration test clamp |
| CN103674456A (en) * | 2013-11-12 | 2014-03-26 | 陕西国力信息技术有限公司 | AMT system resonance detection test method |
| CN104535174A (en) * | 2014-12-05 | 2015-04-22 | 苏州汇川技术有限公司 | Mechanical resonance detecting device and method |
| CN104655375A (en) * | 2013-11-22 | 2015-05-27 | 珠海格力电器股份有限公司 | Motor detection device and detection method thereof |
| CN106323573A (en) * | 2016-07-28 | 2017-01-11 | 中国电子科技集团公司第三十八研究所 | Large vibration test assembly |
| CN107453527A (en) * | 2017-09-15 | 2017-12-08 | 安徽理工大学 | A kind of micro-machine Noise Identification processing method and experimental provision based on resistance technique |
| CN109100102A (en) * | 2018-07-06 | 2018-12-28 | 哈尔滨工业大学（深圳） | Blower modal analysis method, device, terminal and computer readable storage medium based on strain continuous monitoring |
| JP2019035663A (en) * | 2017-08-16 | 2019-03-07 | 孝士 三原 | Constantly vibration monitoring system of equipment and device |
| CN109632229A (en) * | 2019-01-25 | 2019-04-16 | 北京航空航天大学 | Resonance fatigue test method, device and engineering testing fatigue platform |
-
2019
- 2019-12-27 CN CN201911373856.2A patent/CN113049081B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030175125A1 (en) * | 2002-03-16 | 2003-09-18 | Kye-Si Kwon | Operation control method of reciprocating compressor |
| CN102567578A (en) * | 2011-12-20 | 2012-07-11 | 北京卫星环境工程研究所 | Spacecraft vibration test fixture evaluation system |
| CN103575493A (en) * | 2013-11-04 | 2014-02-12 | 株洲南车时代电气股份有限公司 | Device and method for appraising vibration test clamp |
| CN103674456A (en) * | 2013-11-12 | 2014-03-26 | 陕西国力信息技术有限公司 | AMT system resonance detection test method |
| CN104655375A (en) * | 2013-11-22 | 2015-05-27 | 珠海格力电器股份有限公司 | Motor detection device and detection method thereof |
| CN104535174A (en) * | 2014-12-05 | 2015-04-22 | 苏州汇川技术有限公司 | Mechanical resonance detecting device and method |
| CN106323573A (en) * | 2016-07-28 | 2017-01-11 | 中国电子科技集团公司第三十八研究所 | Large vibration test assembly |
| JP2019035663A (en) * | 2017-08-16 | 2019-03-07 | 孝士 三原 | Constantly vibration monitoring system of equipment and device |
| CN107453527A (en) * | 2017-09-15 | 2017-12-08 | 安徽理工大学 | A kind of micro-machine Noise Identification processing method and experimental provision based on resistance technique |
| CN109100102A (en) * | 2018-07-06 | 2018-12-28 | 哈尔滨工业大学（深圳） | Blower modal analysis method, device, terminal and computer readable storage medium based on strain continuous monitoring |
| CN109632229A (en) * | 2019-01-25 | 2019-04-16 | 北京航空航天大学 | Resonance fatigue test method, device and engineering testing fatigue platform |
Non-Patent Citations (2)
| Title |
|---|
| 杜辉等: "基于实验方法的电动机振动特性测试", 《机械》 * |
| 王伟等: "《振动夹具设计技术研究》", 《科技咨询导报》 * |
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