CN111242058A - Android and HHT-based time-varying cable force identification method - Google Patents
Android and HHT-based time-varying cable force identification method Download PDFInfo
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- CN111242058A CN111242058A CN202010048822.2A CN202010048822A CN111242058A CN 111242058 A CN111242058 A CN 111242058A CN 202010048822 A CN202010048822 A CN 202010048822A CN 111242058 A CN111242058 A CN 111242058A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001133 acceleration Effects 0.000 claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims description 3
- 238000013473 artificial intelligence Methods 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/02—Preprocessing
- G06F2218/04—Denoising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/02—Preprocessing
- G06F2218/04—Denoising
- G06F2218/06—Denoising by applying a scale-space analysis, e.g. using wavelet analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/08—Feature extraction
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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- Computer Vision & Pattern Recognition (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a time-varying cable force identification method based on Android and HHT, and belongs to the technical field of civil engineering and artificial intelligence computer vision interaction. According to the method, the vibration acceleration time-course data signals of the stay cable are obtained through the portable Android mobile phone, after the signals are subjected to denoising processing, the fundamental frequency time-course data are obtained through the HHT algorithm, and then the instantaneous cable force is obtained through calculation.
Description
Technical Field
The invention relates to the technical field of civil engineering and artificial intelligence computer vision interaction, in particular to a time-varying cable force identification method based on Android and HHT.
Background
The tension and the change condition of the stay cable directly determine the stress and the deformation state of the main tower and the whole structure; the study on the cable force change of the stay cable can also study the fatigue effect of the stay cable, and provide a scientific basis for the maintenance of the stay cable. The existing methods for measuring the cable force mainly comprise a vibration fundamental frequency method, a magnetic flux sensor method and a static force method. In the prior art, wired acceleration sensors are used in all three methods, the sensors are inconvenient to carry and install, cannot measure time-varying cable force, cannot research the fatigue effect of the stay cable, and are high in manufacturing cost.
Disclosure of Invention
The invention aims to provide a time-varying cable force identification method based on Android and HHT.
The technical scheme of the invention is as follows: a time-varying cable force identification method based on Android and HHT comprises the following steps:
s1: acquiring a stay cable vibration acceleration time-course data signal by using an Android mobile phone, and acquiring a stay cable vibration acceleration time-course data signal;
s2: denoising the acceleration time-course data signal obtained in the S1 by using a wavelet denoising method in signal processing;
s3: performing spectrum analysis on the signal obtained in the S2 by using a power spectrum PSD algorithm to obtain the fundamental frequency of the inhaul cable;
s4: according to the fundamental frequency obtained in the step S3, performing filtering processing on the signal obtained in the step S2 by using a band-pass filter;
s5: decomposing the signal obtained in the step S4 by using a HHT algorithm to obtain fundamental frequency time-course data of inhaul cable vibration;
s6: and calculating the fundamental frequency time-course data obtained in the step S5 according to a cable force-fundamental frequency calculation formula to obtain time-varying cable force data of the cable.
In a further technical scheme, in step S2, a wavelet denoising method in signal processing is used to denoise the acceleration time-course data signal obtained in step S1, and 3 layers are selected as decomposition layers.
In a further technical solution, in step S6, a cable force-fundamental frequency calculation formula is as follows:
T＝4mL2(fn/n)2
wherein T represents the cable force of the cable, m represents the mass per unit length of the cable, L represents the length of the cable, f represents the length of the cablenRepresenting the nth order frequency and n representing the modal order.
The invention has the beneficial effects that:
compared with a method for measuring by using an acceleration sensor, the time-varying cable force identification method based on Android and HHT is more convenient and portable in information acquisition, and the time-varying cable force can be calculated through the technical formula provided by the invention, so that the fatigue effect of the stay cable can be researched.
Drawings
FIG. 1 is a schematic flow chart of the system of the present invention.
Detailed Description
The invention will be further illustrated and understood by the following non-limiting examples.
As shown in fig. 1, the invention relates to a time-varying cable force identification method based on Android and HHT, which comprises the following steps:
s1: acquiring a stay cable vibration acceleration time-course data signal by using an Android mobile phone, and acquiring a stay cable vibration acceleration time-course data signal;
s2: denoising the acceleration time-course data signal obtained in the step S1 by using a wavelet denoising method in signal processing, and selecting 3 layers from the decomposition layers;
s3: performing spectrum analysis on the signal obtained in the S2 by using a power spectrum PSD algorithm to obtain the fundamental frequency of the inhaul cable;
s4: according to the fundamental frequency obtained in the step S3, performing filtering processing on the signal obtained in the step S2 by using a band-pass filter;
s5: decomposing the signal obtained in the step S4 by using a HHT algorithm to obtain fundamental frequency time-course data of inhaul cable vibration;
s6: calculating the fundamental frequency time-course data obtained in the step S5 according to a cable force-fundamental frequency calculation formula to obtain time-varying cable force data of the cable, wherein the cable force-fundamental frequency calculation formula is as follows:
T＝4mL2(fn/n)2
wherein T represents the cable force of the cable, m represents the mass of the cable in unit length, L represents the length of the cable, represents the nth order frequency, and n represents the modal order.
Claims (3)
1. A time-varying cable force identification method based on Android and HHT is characterized by comprising the following steps:
s1: acquiring a stay cable vibration acceleration time-course data signal by using an Android mobile phone, and acquiring a stay cable vibration acceleration time-course data signal;
s2: denoising the acceleration time-course data signal obtained in the step S1 by using a wavelet denoising method in signal processing;
s3: performing spectrum analysis on the signal obtained in the S2 by using a power spectrum PSD algorithm to obtain the fundamental frequency of the inhaul cable;
s4: according to the fundamental frequency obtained in the step S3, performing filtering processing on the signal obtained in the step S2 by using a band-pass filter;
s5: decomposing the signal obtained in the S4 by using a HHT algorithm to obtain fundamental frequency time-course data of inhaul cable vibration;
s6: and calculating the fundamental frequency time-course data obtained in the step S5 according to a cable force-fundamental frequency calculation formula to obtain time-varying cable force data of the cable.
2. The Android and HHT-based time-varying cable force recognition method according to claim 1, wherein in S2, a wavelet denoising method in signal processing is used for denoising the acceleration time-course data signal obtained in the step S1, wherein 3 layers are selected as decomposition layers.
3. The Android and HHT-based time-varying cable force identification method according to claim 1, wherein in S6, a cable force-fundamental frequency calculation formula is as follows:
T＝4mL2(fn/n)2
wherein T represents the cable force of the cable, m represents the mass per unit length of the cable, L represents the length of the cable, f represents the length of the cablenRepresenting the nth order frequency and n representing the modal order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010048822.2A CN111242058A (en) | 2020-01-16 | 2020-01-16 | Android and HHT-based time-varying cable force identification method |
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| CN202010048822.2A CN111242058A (en) | 2020-01-16 | 2020-01-16 | Android and HHT-based time-varying cable force identification method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698071A (en) * | 2013-12-12 | 2014-04-02 | 哈尔滨工业大学 | Inhaul cable time-variant cable force process recognition data driving method based on acceleration speed monitoring |
| CN104155044A (en) * | 2014-07-14 | 2014-11-19 | 华南理工大学 | Measuring device and measuring method for cable force of cable-stayed bridge based on mobile terminal |
| CN204064530U (en) * | 2014-07-31 | 2014-12-31 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | A kind of no trace force test system based on micro electronmechanical acceleration chip |
| CN107966228A (en) * | 2016-10-19 | 2018-04-27 | 南京智行信息科技有限公司 | A kind of intelligent wireless cable force monitoring system and monitoring method |
| CN109948249A (en) * | 2019-03-19 | 2019-06-28 | 东南大学 | Suspension cable time-varying Suo Li recognition methods based on variation mode decomposition |
-
2020
- 2020-01-16 CN CN202010048822.2A patent/CN111242058A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698071A (en) * | 2013-12-12 | 2014-04-02 | 哈尔滨工业大学 | Inhaul cable time-variant cable force process recognition data driving method based on acceleration speed monitoring |
| CN104155044A (en) * | 2014-07-14 | 2014-11-19 | 华南理工大学 | Measuring device and measuring method for cable force of cable-stayed bridge based on mobile terminal |
| CN204064530U (en) * | 2014-07-31 | 2014-12-31 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | A kind of no trace force test system based on micro electronmechanical acceleration chip |
| CN107966228A (en) * | 2016-10-19 | 2018-04-27 | 南京智行信息科技有限公司 | A kind of intelligent wireless cable force monitoring system and monitoring method |
| CN109948249A (en) * | 2019-03-19 | 2019-06-28 | 东南大学 | Suspension cable time-varying Suo Li recognition methods based on variation mode decomposition |
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