CN107144388A - A kind of universe of flexible rope vibration frequency searches peak method - Google Patents

A kind of universe of flexible rope vibration frequency searches peak method Download PDF

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Publication number
CN107144388A
CN107144388A CN201710348784.0A CN201710348784A CN107144388A CN 107144388 A CN107144388 A CN 107144388A CN 201710348784 A CN201710348784 A CN 201710348784A CN 107144388 A CN107144388 A CN 107144388A
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China
Prior art keywords
flexible rope
frequency
vibration frequency
vibration
universe
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CN107144388B (en
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彭家意
张宇峰
杨超
杨迪
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Hohai University HHU
JSTI Group Co Ltd
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Hohai University HHU
JSTI Group Co Ltd
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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
    • G01L5/042—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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

A kind of universe for flexible rope vibration frequency that the present invention is provided searches peak method, comprises the following steps：Determine the vibration data of flexible rope, and frequency-domain transform is carried out to the vibration data of flexible rope, obtain the rumble spectrum of flexible rope, extremum search is carried out in full frequency-domain, the data point in the extreme value field searched is set to 0, then to setting to 0 after full frequency-domain carry out extremum search, search is until obtaining enough extreme values more than repeatedly, ascending sequence, the actual each rank vibration frequency of the extreme frequencies after sequence, as flexible rope are carried out to the extreme value searched again.The universe of the present invention searches the multistage vibration frequency that peak method may search for flexible rope, and the vibration frequency of flexible rope is quickly obtained using the modern tools such as computer or manual search, easy to operate, and computational methods are simple, as a result accurately.

Description

A kind of universe of flexible rope vibration frequency searches peak method
Technical field
The invention belongs to civil structure engineering monitoring field, more particularly to a kind of universe of flexible rope vibration frequency searches peak Method.
Background technology
As increasing rapidly for Bridges in Our Country quantity is increasingly sophisticated harsh with bridge operation environment, the safety of science of bridge building Problem becomes increasingly conspicuous.According to incompletely statistics, China occurs bridge collapse accident more than 50 and risen altogether during 1999~2016 years, causes Huge life and property loss and severe social influence.The safety of bridge structure is just by the increasingly extensive pass of government and society Note.
Construction monitoring is to ensure that the large scale structures such as bridge embody a kind of hand of mentality of designing in construction or service stage perfection Section, span, the very big breakthrough of structural shape with large scale structures such as bridges, conventional calculating or measurement means has been difficult standard Force-bearing situation of the structure under various operating modes really is drawn, it is necessary to introduce monitoring and make auxiliary control device, in the large-scale knot such as bridge Play a part of instructing and adjusting sequence of construction in the construction of structure.Construction monitoring mainly has two aspects：Construction monitoring and construction Control, construction monitoring can not only ensure the result of safety but also construction monitoring of the large scale structures such as bridge in work progress There is provided data for Construction control, and Construction control is exactly effectively to be controlled in construction overall process, it is ensured that into structural linetype with Internal force meets design requirement.Construction monitoring mainly includes deflection observation, temperature effect observation, stress-strain observation (by strain Piece surveys strain), prestressing force observation (for prestressed structure), Suo Li observation (including cable-stayed bridge cable, suspension bridge, arched bridge pre-stressed boom Boom tensile force, Hoisting Steel Pipe Arch Stayed-buckle Cable Forcess value), the Vibration of structure (including vibration amplitude, vibration frequency, vibration mould State) etc..
Monitoring structural health conditions (structure health monitoring, abbreviation SHM) are the development of civil engineering subject One key areas.Monitoring structural health conditions are by being monitored to flexible rope reason mechanical property, and its local environment, in real time Or the discontinuously entirety of monitoring structure or local behavior, damage displacement and degree to structure diagnose, the military service to structure Situation, reliability, durability and bearing capacity carry out intelligent evaluation, be structure under accident or structure behaviour in service is serious Pre-warning signal is triggered when abnormal, foundation and guidance are provided for the maintenance, maintenance and administrative decision of structure.Structural health monitoring technology It is a multi-field integrated technology interdisciplinary, is related to civil engineering, dynamics, materialogy, sensing technology, test skill Multiple research directions such as art, signal analysis technology, computer technology, the network communications technology, mode identification technology.
Vibration frequency is the self-characteristic of flexible rope, will not typically be shaken with the influence of external environment and loads change Dynamic frequency is the Mass Distribution of flexible rope and the function of Stiffness Distribution, can reflect the ginseng of flexible rope holistic health Number.When the vibration frequency of flexible rope is changed, then illustrate that the Mass Distribution and Stiffness Distribution of flexible rope are become Change, i.e. flexible rope occurs in that damage, therefore the vibration frequency of flexible rope is important indicator that large bridge must be monitored, It is the important parameter for evaluating bridge structure health situation.
For the fast development of current structure health monitoring technique, the Monitoring Data of magnanimity needs to be handled in time, Therefrom excavate the status information of structure, it is necessary to make full use of computer, pass through algorithm design and program development so that calculate Machine can be automatically handled magnanimity Monitoring Data.The method of the present invention is just applied to computer automation and handles flexible The vibration data of rope, obtains the multistage vibration frequency of flexible rope.
The content of the invention
Technical problem：In order to solve the defect of prior art, the invention provides a kind of the complete of flexible rope vibration frequency Peak method is searched in domain.
Technical scheme：A kind of universe for flexible rope vibration frequency that the present invention is provided searches peak method, comprises the following steps：
Step 1, the time domain vibration data of the vibration data, i.e. flexible rope of flexible rope is determined using vibrating sensor；
Step 2, frequency-domain transform is carried out to the time domain vibration data of flexible rope, obtains the rumble spectrum of flexible rope；
Step 3, the corresponding vibration frequency of maximum of full frequency-domain is takenBy vibration frequencyFieldInterior all vibration frequency domain data points are set to 0；
Step 4, repeat step 3, the frequency in need until finding；
Step 5, to all frequenciesCarry out ascending sequence, you can obtain each rank vibration frequency f of flexible ropei。
Wherein, in step 2, frequency-domain transform method is Fourier transformation.
Wherein, in step 3, f1 *It is initial fundamental frequency, can is the calculated results (for example, using FEM model method Calculate and obtain), or historical vibration frequency data.
Beneficial effect：The universe of the present invention searches the multistage vibration frequency that peak method may search for flexible rope, using calculating The modern tools such as machine or manual search quickly obtain the vibration frequency of flexible rope, easy to operate, and computational methods are simple, as a result accurate Really.
Specifically, the present invention has advantage following prominent relative to prior art：
(1) computational methods are simple, easy to operate, readily appreciate, as a result accurately；
(2) this method is easy to computer program to realize, is easy to the quick batch processing of computer；
(3) this method can search for the multistage vibration frequency of flexible rope, can obtain currently practical according to priori Vibration frequency；
Brief description of the drawings
Fig. 1 is the acceleration-time curve in certain bridge root drag-line 15 minutes；
Fig. 2 is the rumble spectrum figure of flexible rope.
Embodiment
The method for searching method search vibration frequency in peak to universe of the present invention below is made and further illustrated.
Embodiment 1
Universe searches peak method search vibration frequency, and step is as follows：
Step 1, the time domain vibration data of the vibration data, i.e. flexible rope of flexible rope is determined using vibrating sensor, As shown in figure 1, being the acceleration-time curve in certain bridge root drag-line 15 minutes；
Step 2, frequency-domain transform is carried out to the time domain vibration data of flexible rope, obtains the rumble spectrum of flexible rope, such as Shown in Fig. 2；Transform method utilizes discrete Fourier transform, and formula is as follows：
Wherein, x (n) is discrete Acceleration time course data row, and n is the sequence number of acceleration information point, and N is Acceleration time course In the number of the data volume, i.e. sampled point of data row, this example, sample frequency is 20Hz, a length of 15 minutes during sampling, then sampled point Number is N=15*60*20=18000, and j is imaginary number, and X (k) is the frequency domain data row after conversion, and k is the sequence number of frequency domain data point；
Step 3, the corresponding frequency of maximum of full frequency-domain is takenBy frequencyFieldInterior institute There is frequency domain data point to be set to 0；
Wherein f1 *=0.3501Hz is initial fundamental frequency, is obtained according to history value manual identified；
Step 4, repeat step 3, the frequency in need until finding；
Step 5, to all frequenciesCarry out ascending sequence, you can obtain each rank vibration frequency f of flexible ropei；
In this example, the f obtained according to historical data analysisi *It is shown in Table 1, the f obtained according to currently practical data analysisi It is shown in Table 1.
Table 1
The accuracy and reliability of the inventive method have passed through real bridge verification experimental verification：Table 1 is shaking for certain bridge root rope Dynamic frequency, wherein fi *It is the historical frequency of manual identified, fiIt is the practical frequency searched using the inventive method, they exhausted 0.01Hz is no more than to error, relative error is no more than 0.5%, complies fully with requirement of engineering precision, illustrate the accurate of this method Property is higher.

Claims (3)

1. a kind of universe of flexible rope vibration frequency searches peak method, it is characterised in that：Comprise the following steps：
Step 1, the time domain vibration data of the vibration data, i.e. flexible rope of flexible rope is determined using vibrating sensor；
Step 2, frequency-domain transform is carried out to the time domain vibration data of flexible rope, obtains the rumble spectrum of flexible rope；
Step 3, the corresponding vibration frequency of maximum of full frequency-domain is takenBy vibration frequencyFieldIt is interior All frequency domain data points be set to 0；
Step 4, repeat step 3, the frequency in need until finding；
Step 5, to all frequenciesCarry out ascending sequence, you can obtain each rank vibration frequency f of flexible ropei。
2. a kind of universe of flexible rope vibration frequency according to claim 1 searches peak method, it is characterised in that：In step 2, Frequency-domain transform method is Fourier transformation.
3. a kind of universe of flexible rope vibration frequency according to claim 1 searches peak method, it is characterised in that：In step 3, f1 *It is initial fundamental frequency, can is the calculated results, or historical vibration frequency data.
CN201710348784.0A 2017-05-17 2017-05-17 Global peak searching method for flexible rope vibration frequency Active CN107144388B (en)

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Publication number Priority date Publication date Assignee Title
CN108007627A (en) * 2017-12-20 2018-05-08 哈尔滨开博科技有限公司 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

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