CN108007627B - It is a kind of using sine excitation device and video instrument and to introduce the vibratory drilling method Cable force measuring method of vibration displacement - Google Patents
It is a kind of using sine excitation device and video instrument and to introduce the vibratory drilling method Cable force measuring method of vibration displacement Download PDFInfo
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- CN108007627B CN108007627B CN201711384151.1A CN201711384151A CN108007627B CN 108007627 B CN108007627 B CN 108007627B CN 201711384151 A CN201711384151 A CN 201711384151A CN 108007627 B CN108007627 B CN 108007627B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005284 excitation Effects 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 title claims abstract description 12
- 238000005452 bending Methods 0.000 claims description 7
- 238000000691 measurement method Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005481 string theory Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01L5/042—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 by measuring vibrational characteristics of the flexible member
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
It is a kind of using sine excitation device and video instrument and to introduce the vibratory drilling method Cable force measuring method of vibration displacement, belong to technical field of civil engineering；The inventive method estimates the base frequency range of rope first, and vibration excitor is installed at rope half length, and vibration excitor is allowed to estimate scanning frequency excitation in base frequency range, and when Suo Fasheng resonance, excited frequency is rope natural frequency of vibration f to record at this time1, utilize the vibration displacement of a certain in a flash section of rope of video instrument observational record, Suo Li is finally acquired using vibration shape Suo Li identification model.The present invention proposes a numerical computation method, can identify the pulling force of drag-line in the case where boundary condition is unknown using some natural frequency of vibration f of rope and several vibration shape components of the corresponding vibration shape.
Description
Technical field
The present invention relates to a kind of vibratory drilling method Cable force measuring methods of combination vibration displacement, belong to civil engineering technology
Field.
Background technique
Cable system bridge mainly carries out the transmitting and distribution of power by drag-line, and drag-line is the main stress structure of cable system bridge
Part.The Suo Li of drag-line is cable system bridge construction control and the important indicator for assessing bridge normal operating condition.
The cable tension test of vibratory drilling method with when need to solve two critical issues: the 1) identification of the drag-line natural frequency of vibration, 2)
The determination of Suo Li-natural frequency of vibration corresponding relationship.Under the conditions of existing measuring instrument and analysis means, the precision for measuring frequency can
Reach 0.005Hz.Therefore, the accuracy of frequency method cable tension test depends primarily on the accuracy of Suo Li Yu natural frequency of vibration relationship,
That is the precision of model.
The main problem of existing cable force measurement method has:
A) for the elongated rope under Simple Boundary Conditions, Suo Li calculating ratio is more accurate, but very big for tackline, diameter
For middle long rope, cannot directly it be applied since its rigidity is larger, boundary condition is complicated；
If b) discontinuous at segmentation using piecewise fitting rule, it is necessary to be handled differently to long tackline, according to dimensionless
Parameter Subsection formulas for calculating, segmentation calculate；
In engineering practice, often the boundary condition of practical rope is unknown, and boundary in the cable systems of a bridge block
When condition is unknown, either the vibration equation of string theory or beam theory can not be solved.So for boundary condition to Suo Li
In the case where being affected, existing vibratory drilling method cable force measurement method is unable to satisfy Suo Li and accurately requires.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problems, and then provide a kind of utilization sine excitation device and video instrument
And introduce the vibratory drilling method Cable force measuring method of vibration displacement.
Technical solution of the present invention:
It is a kind of using sine excitation device and video instrument and to introduce the vibratory drilling method Cable force measuring method of vibration displacement and include
Following steps:
Step a: it according to drawing and field observation situation, is estimated using theoretical formula by the fundamental natural frequency f of measuring rope1It can
Energy range [fD, fU], wherein fDFor fundamental natural frequency f1Possible range lower bound, fUFor fundamental natural frequency f1In possible range
Boundary；
Step b: vibration excitor is installed at the rope half length for needing to measure, and in fixed bottom boundary restocking setting video instrument
The displacement of a certain in a flash section of rope of observational record；
Step c: the excited frequency f of vibration excitor is fixed on [f by starting vibration excitorD, fU] a certain value in range, by exciting
Device is placed in place, and the ascending frequency sweep of vibration excitor excited frequency is allowed to record and swash at this time when Suo Fasheng resonance
Vibration frequency is fundamental natural frequency f1；
Step d: holding allows Suo Wending to resonate, and with one section of rope of video instrument irradiation rope half director's degree 2m, record should
The time-histories of section rope vibration deformation, chooses this section of rope vibration deformation biggish moment, reads this section of rope by video instrument software
On the vibration displacement numerical value equidistantly put
Step e: the shift value that video instrument measurement is obtainedIt substitutes into vibration shape Suo Li identification model and acquires Suo Li, identify mould
Type expression formula are as follows:
In formula: T is Cable force value, and EI is rope section bending stiffness (Nm2), h is vibration displacement observation point spacing (its
Unit is m) f1For the rope natural frequency of vibration,For the vibration displacement numerical value equidistantly put read by video instrument software, G0、 G2、
G4Respectively 0 rank leads coefficient, 2 ranks lead coefficient and 4 ranks lead coefficient.
Further, the theoretical formula in step a are as follows:
F in formulaDFor fundamental natural frequency f1Possible range lower bound, fUFor fundamental natural frequency f1The possible range upper bound, L are
Rope is long (its unit is m), and EI is that (its unit is Nm to rope section bending stiffness2), m is that (its unit is unit linear mass
Kg/m), T1For rope tensility (its unit the is N) lower limit value estimated, T2For rope tensility (its unit the is N) upper limit value estimated.
Further, the vibration excitor in step b is sinusoidal vibration excitor.
Further, the vibration displacement numerical value equidistantly put on this section of rope is read by video instrument software in step d, it is required
Points no less than 16, put 0.01~0.1m of spacing h value range.
The invention has the following advantages: the method for the present invention estimates the base frequency range of rope first, it is long in rope half
Vibration excitor is installed at degree, allows vibration excitor estimating scanning frequency excitation in base frequency range, video instrument is utilized to observe rope segment length drag-line
Vibration displacement.Extract the vibration displacement numerical value equidistantly put in this section of rope lengthThe displacement that video instrument is measured
Numerical valueIt substitutes into vibration shape Suo Li identification model and acquires Suo Li.By introducing natural frequency of vibration f1The corresponding vibration shape, proposes one kind
The measurement method of accurate Cable power is obtained in the case where boundary condition is unknown.
Detailed description of the invention
Fig. 1 is measurement method schematic diagram of the invention；
1- is by measuring rope, 2- rope anchored end, 3- sine excitation device, 4- video instrument, 5- video instrument measurement Suo Changduan in figure.
Specific embodiment
The specific embodiment of the invention is described in further detail below.
The a kind of of the present embodiment utilizes sine excitation device and video instrument, introduces the vibratory drilling method drag-line cable force measurement of vibration displacement
Method, comprising the following steps:
Step a: according to drawing and field observation situation, using theoretical formula and comparison experienced mode estimate it is tested
Fundamental natural frequency (hereinafter referred to as fundamental frequency) f of rope1Possible range [fD, fU].Wherein fDFor fundamental frequency f1Possible range lower bound, fU
For fundamental frequency f1The possible range upper bound.Wherein range [fD, fU], it can be calculated by following formula
L is that rope is long (m) in formula, and EI is rope section bending stiffness (Nm2), m is unit linear mass (kg/m), T1It is pre-
Rope tensility (N) lower limit value estimated, T2For rope tensility (N) upper limit value estimated.
In the present embodiment, the long L=10m of rope, rope section bending stiffness EI=3342000Nm4, rope tensility T=1800
~2 200kN, linear mass m=75kg/m.According to Classical Beam Theory of Vibration, and other measured results are compared, the rope
Fundamental frequency should be in the section [8.4Hz, 13.0Hz].
Step b: vibration excitor is installed at the rope half length for needing to measure, and in fixed bottom boundary restocking setting video instrument
The displacement of a certain in a flash section of rope of observational record.
Sine excitation device, amplitude of exciting force 1.0kN are installed at rope half length in the present embodiment.In distance
Video instrument is set up at rope about 5m, as shown in Figure 1.
Step c: the excited frequency f of vibration excitor is fixed on [f by starting vibration excitorD, fU] a certain value in range, by exciting
Device is placed in place, and the ascending frequency sweep of vibration excitor excited frequency is allowed to record and swash at this time when Suo Fasheng resonance
Vibration frequency is rope natural frequency of vibration f1。
In the present embodiment, f is finally taken in section [8.4Hz, 13.0Hz]1=11.7Hz.
Step d: holding allows Suo Wending to resonate, and with one section of rope of video instrument irradiation rope half director's degree 2m, record should
The time-histories of section rope vibration deformation (displacement).This section of rope vibration deformation (displacement) biggish moment is chosen, it is soft by video instrument
Part reads the vibration displacement numerical value equidistantly put on this section of ropeRequired points no less than 16, put spacing h value range 0.01
~0.1m.
In the present embodiment, Suo Zhen dynamic stability is waited after starting vibration excitor, observes a certain moment in Suo Erfen using video instrument
One of place occur one section.A length of 1s when observing in this example, displacement sample frequency are 100Hz, and displacement observation precision is 0.001mm.
From from mono- section away from 1 end 3.9m to 5.9m of rope, 21 point displacements are read by spacing h=0.1m, are read shown in result table 1.
1 mode displacement of table reads result unit: mm
Step e: the shift value that video instrument measurement is obtainedIt substitutes into vibration shape Suo Li identification model and acquires rope
Power, identification model expression formula are as follows:
In formula: T is Cable force value, and EI is rope section bending stiffness (Nm2), h is vibration displacement observation point spacing
(m), f1For the rope natural frequency of vibration,For the vibration displacement numerical value equidistantly put read by video instrument software, G0、G2、G4For
0 rank leads coefficient, 2 ranks lead coefficient and 4 ranks lead coefficient.
1 data of table substitution identification model expression formula can be found out into identification Suo Li T in the present embodiment1, control identification Suo Li
With actual value, such as table 2.
Table 2 identifies Suo Li error
This embodiment is just an exemplary description of this patent, does not limit its protection scope, those skilled in the art
Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.
Claims (3)
- Using sine excitation device and video instrument and the vibratory drilling method Cable force measuring method of vibration displacement, feature are introduced 1. a kind of It is, comprising the following steps:Step a: it according to drawing and field observation situation, is estimated using theoretical formula by the fundamental natural frequency f of measuring rope1Possible model Enclose [fD, fU], wherein fDFor fundamental natural frequency f1Possible range lower bound, fUFor fundamental natural frequency f1The possible range upper bound；Step b: vibration excitor is installed at the rope half length for needing to measure, and is observed in fixed bottom boundary restocking setting video instrument Record the displacement of certain a certain in a flash section of rope；Step c: the excited frequency f of vibration excitor is fixed on [f by starting vibration excitorD, fU] a certain value in range, vibration excitor is put It sets in place, and allows the ascending frequency sweep of vibration excitor excited frequency, when Suo Fasheng resonance, record exciting frequency at this time Rate is fundamental natural frequency f1；Step d: holding allows Suo Wending to resonate, and with one section of rope of video instrument irradiation rope half director's degree 2m, records this section of rope The time-histories of vibration deformation chooses this section of rope vibration deformation biggish moment, read on this section of rope by video instrument software etc. The vibration displacement numerical value of spacing pointStep e: the shift value that video instrument measurement is obtainedIt substitutes into vibration shape Suo Li identification model and acquires Suo Li, identification model table Up to formula are as follows:In formula: T is Cable force value, and EI is rope section bending stiffness, and h is vibration displacement observation point spacing, and m is unit length matter Amount, f1For the rope natural frequency of vibration,For the vibration displacement numerical value equidistantly put read by video instrument software, G0、G2、G4Respectively Coefficient is led for 0 rank, 2 ranks lead coefficient and 4 ranks lead coefficient.
- A kind of using sine excitation device and video instrument and the vibratory drilling method drag-line of vibration displacement is introduced 2. according to claim 1 Cable force measurement method, which is characterized in that the theoretical formula in step a are as follows:F in formulaDFor fundamental natural frequency f1Possible range lower bound, fUFor fundamental natural frequency f1The possible range upper bound, L are that rope is long, EI is rope section bending stiffness, and m is unit linear mass, T1For the rope tensility lower limit value estimated, T2For the rope tensility upper limit estimated Value.
- A kind of using sine excitation device and video instrument and the vibratory drilling method drag-line of vibration displacement is introduced 3. according to claim 1 Cable force measurement method, which is characterized in that the vibration displacement number equidistantly put on this section of rope is read by video instrument software in step d Value, puts 0.01~0.1m of spacing h value range by required points no less than 16.
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| CN108955983A (en) * | 2018-07-25 | 2018-12-07 | 湖南大学 | Cable tension test method based on the drag-line vibration shape and photogrammetric technology |
| CN109063351B (en) * | 2018-08-10 | 2023-06-23 | 武汉理工大学 | Cable-stayed bridge cable force calculation method under influence of adjusting sleeve |
| CN109341903B (en) * | 2018-11-08 | 2020-10-02 | 东南大学 | Inhaul cable force measuring method based on edge recognition in computer vision |
| CN110608833A (en) * | 2019-09-12 | 2019-12-24 | 江苏方天电力技术有限公司 | System and method for measuring axial force of pull rod under thermal state condition |
| CN111649857A (en) * | 2020-04-23 | 2020-09-11 | 河海大学 | Inhaul cable modal measurement method for target matching analysis |
| CN114353861B (en) * | 2021-12-02 | 2024-07-09 | 中国矿业大学 | Comprehensive detection device and method for suspension bridge sling and cable clamp state |
| CN115452226B (en) * | 2022-10-05 | 2023-12-19 | 大连理工大学 | Cable force recognition algorithm considering semi-rigid constraint at two ends |
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| KR100343279B1 (en) * | 1999-04-28 | 2002-07-11 | 장승필 | A Measuring Method of Cable Tension Using the Dynamic Characteristics of Cable |
| CN101893497B (en) * | 2010-06-13 | 2012-01-11 | 东南大学 | Out-of-plane frequency method for testing cable force of planar cable rod system |
| CN101900620B (en) * | 2010-06-23 | 2012-05-23 | 华南理工大学 | Method for identifying variable boundary cable force of medium or long cable |
| CN104502010A (en) * | 2014-10-15 | 2015-04-08 | 徐辉 | Method and device for cable force test in unknown boundary condition |
| CN104933254B (en) * | 2015-06-25 | 2017-12-08 | 哈尔滨开博科技有限公司 | Modified linear mixture model vibratory drilling method cable force measurement method based on frequency ratio deviation ratio |
| CN107144388B (en) * | 2017-05-17 | 2022-09-23 | 苏交科集团股份有限公司 | Global peak searching method for flexible rope vibration frequency |
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Effective date of registration: 20231008 Address after: Room 1002, Unit 4, Building 10, East Zone, Zhaofeng Jiayuan, Shahe Town, Changping District, Beijing 102200 Patentee after: Li Dajun Address before: No. 101, 1st Floor, Harbin Institute of Technology Science Park Building, No. 434 Youyou Street, Nangang District, Harbin City, Heilongjiang Province, 150000 Patentee before: HARBIN KAIBO TECHNOLOGY CO.,LTD. |
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Effective date of registration: 20240104 Address after: Room 1411, No. 2, Houzhuang Section, Zhaosi Road, Zhangzhen, Shunyi District, Beijing, 101300 Patentee after: Hualu Youdao (Beijing) Information Technology Co.,Ltd. Address before: Room 1002, Unit 4, Building 10, East Zone, Zhaofeng Jiayuan, Shahe Town, Changping District, Beijing 102200 Patentee before: Li Dajun |
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