CN109520830B - Online monitoring device for acoustic state of pipeline elastic element - Google Patents
Online monitoring device for acoustic state of pipeline elastic element Download PDFInfo
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- CN109520830B CN109520830B CN201811412876.1A CN201811412876A CN109520830B CN 109520830 B CN109520830 B CN 109520830B CN 201811412876 A CN201811412876 A CN 201811412876A CN 109520830 B CN109520830 B CN 109520830B
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses an on-line monitoring device for the acoustic state of a pipeline elastic element, which comprises a strain gauge, a junction box, a data acquisition module, a data processing module and a display console, wherein the strain gauge is connected with the junction box; the strain gauges are arranged in two groups, wherein the two groups of strain gauges are arranged at two positions, and the first position is the circumferential direction of the flange at the outlet side of the vibration reduction connecting pipe and is used for monitoring the torsion stress of the vibration reduction connecting pipe and judging the torsion acoustic state; the second position is the axial direction of the pipeline connected with the connecting pipe and is used for monitoring the axial stress of the vibration reduction connecting pipe and judging the axial acoustic state; the stress sheet measures the strain of the elastic element of the pipeline, the strain is transmitted to the data acquisition module and the data processing module through the junction box, and the acoustic state of the elastic element is formed and displayed on the display control equipment according to the processing of corresponding calculation software.
Description
Technical Field
The invention belongs to the technical field of vibration noise control, and particularly relates to an acoustic state on-line monitoring device of an elastic element.
Background
The acoustic state of the pipeline elastic element is mainly characterized by rigidity and mechanical impedance, and the pipeline of the ship system adopts a large number of elastic elements such as vibration damping connecting pipes, elastic supports and the like to carry out vibration isolation design, and the acoustic state of the pipeline elastic element is determined by the stress and deformation state of the pipeline elastic element. Because of the great difficulty in online measurement and evaluation of deformation and acoustic states of the elastic elements, the monitoring and control of the sound stealth performance of the ship are affected.
Disclosure of Invention
In view of the above, the invention provides an on-line monitoring device for the acoustic state of the elastic element of the pipeline, which can realize non-contact measurement, meet the environmental requirements of ships, is stable and reliable, has strong external interference resistance, and can effectively measure and evaluate the acoustic state of the elastic element of the pipeline in real time.
The device comprises a strain gauge, a junction box, a data acquisition module, a data processing module and a display console;
the strain gauges are arranged in two groups, and the two groups of strain gauges are arranged at two positions, wherein the first position is the circumferential direction of the flange at the outlet side of the vibration reduction connecting pipe and is used for monitoring the torsion stress of the vibration reduction connecting pipe and judging the torsion acoustic state; the second position is the axial direction of the pipeline connected with the connecting pipe and is used for monitoring the axial stress of the vibration reduction connecting pipe and judging the axial acoustic state; the stress sheet measures the strain of the elastic element of the pipeline, the strain is transmitted to the data acquisition module and the data processing module through the junction box, and the acoustic state of the elastic element is formed and displayed on the display control equipment according to the processing of corresponding calculation software.
Further, each group of strain gauges is three, the strain gauges in the first group are arranged on the periphery of the flange at the outlet side of the vibration reduction connecting pipe, the two strain gauges are arranged along the periphery of the flange and form an included angle of 90 degrees, and the other strain gauge is arranged along the radial direction of the pipeline; the second group of strain gauges are arranged in the axial direction of the pipeline connected with the connecting pipe in a way that the two strain gauges are along the axial direction of the pipeline and form an included angle of 90 degrees, and the other strain gauge is perpendicular to the axial direction of the pipeline.
Further, the monitoring device adopts a 1/4 Wheatstone bridge to test the voltage change when the strain gauge is strained, the strain of the tested piece is obtained through conversion according to the voltage change value, then the stress of the elastic element is obtained, the acting force of the elastic element is obtained through calculation according to the stress of the elastic element, the deformation state of the element is obtained through calculation according to the acting force of the elastic element, and finally the acoustic parameters of the elastic element are obtained according to the stress or the deformation state of the elastic element.
The beneficial effects are that:
according to the invention, the on-line monitoring of the acoustic state of the pipeline elastic element can be realized according to the deformation condition of the strain gauge, and the acoustic state is displayed in real time, so that the requirement of full-period monitoring of equipment is met.
Drawings
FIG. 1 is a schematic overall layout of the present invention;
FIG. 2 is a schematic diagram of a strain gauge layout on a flange;
FIG. 3 is a schematic diagram of the layout of strain gauges on a pipeline;
FIG. 4 is a schematic diagram of a Wheatstone bridge
FIG. 5 is a graph showing the vertical stiffness of an elastic member as a function of load
Wherein, 1-equipment, 2-vibration reduction connecting pipe, 3-flange, 4-pipeline and 5-strain gauge.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides an on-line monitoring device for the acoustic state of a pipeline elastic element, which comprises a strain gauge, a junction box, a data acquisition module, a data processing module and a display console, wherein the strain gauge is connected with the junction box; as shown in fig. 1, the device 1 is connected with a vibration damping connecting pipe 2, and the vibration damping connecting pipe 2 is connected with a pipeline through a flange.
1) Sticking a strain gauge:
the measuring points for acoustic state monitoring of the damping adapter 2 are arranged in 2 positions, and each position is formed into 1 group of tested pieces by 3 strain gauges. The first position is the circumferential direction of the flange at the outlet side of the vibration reduction connecting pipe, and is used for monitoring the torsion stress of the vibration reduction connecting pipe and judging the torsion acoustic state; and the second position is the axial direction of the pipeline connected with the connecting pipe and is used for monitoring the axial stress of the vibration reduction connecting pipe and judging the axial acoustic state.
As shown in fig. 2, 3 strain singlechips are required to be arranged at the first position, wherein the arrangement mode is that 2 singlechips are arranged along the circumferential direction of the flange and form an included angle of 90 degrees, and the other strain gauge is arranged along the radial direction of the pipeline;
as shown in figure 3, the second position is required to arrange 3 strain singlechips, wherein the arrangement mode is that 2 singlechips are arranged along the axial direction of the pipeline and form an included angle of 90 degrees, and the other strain gauge is perpendicular to the axial direction of the pipeline.
Powering the bridge and measuring the output voltage:
the in-line monitoring device was tested using a 1/4 wheatstone bridge as shown in fig. 4. The power supply voltage of the Wheatstone bridge circuit is E, and the output voltage E 0 Is the potential difference at A, B.
Voltage variation when strain occurs in a test piece
One bridge arm of the bridge is connected with a test piece consisting of 3 strain gauges, and the initial resistance of the test piece is R 1 Under the action of tensile force, compressive force or torsion force, the test piece generates strain in the circumferential direction and the axial direction. The other 3 bridge arms are connected with fixed resistors, and R is when the stress of the pipeline changes 1 The resistance of (a) will vary with it, assuming that the resistance varies to ΔR 1 The output voltage variation value of the bridge is therefore:
obtaining the strain of the tested piece according to the conversion of the voltage change value
The corresponding relation between the resistance change and the strain of the test piece is as follows:
where K is the sensitivity coefficient of the strain gauge, so that formula (3) becomes:
therefore, the strain of the strain gage is:
calculation of stress of elastic element based on strain
The stress of the strain gauge is as follows:
σ＝Eε (7)
e is the elastic modulus of the material of the elastic element of the pipeline, and the elastic modulus is called from a related parameter database of the elastic element; sigma is the stress of the tested piece, and epsilon is the strain obtained by measurement and calculation;
calculating the acting force of the elastic element according to the stress of the elastic element
The elastic element is acted by the following force:
S＝σA (8)
s is the axial or torsional stress of the elastic element, and A is the stress area.
Calculating the deformation state of the element according to the acting force exerted by the elastic element
According to the relation of the stress, deformation and rigidity of the elastic element, the following equation is provided:
S＝k(x)·x (9)
wherein k (x) is the deformation relation between the rigidity of the elastic element and the original, and the deformation of the elastic element is obtained by solving the deformation of the elastic element by using the formula (9);
according to the stress or deformation state of the elastic element, obtaining the acoustic parameters of the elastic element
And obtaining the stress state and the deformation state of the elastic element through stress strain measurement, and then determining the acoustic state of the elastic element according to the corresponding relation of the stress state, the deformation state and the acoustic state of the element. The corresponding relation is composed of a series of regular curves obtained by test results and simulation calculation results, and is shown in figure 5 and displayed on a central control display screen.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The on-line monitoring device for the acoustic state of the pipeline elastic element is characterized by comprising a strain gauge, a junction box, a data acquisition module, a data processing module and a display console; the strain gauges are arranged in two groups, and the two groups of strain gauges are arranged at two positions, wherein the first position is the circumferential direction of the flange at the outlet side of the vibration reduction connecting pipe and is used for monitoring the torsion stress of the vibration reduction connecting pipe and judging the torsion acoustic state; the second position is the axial direction of the pipeline connected with the connecting pipe and is used for monitoring the axial stress of the vibration reduction connecting pipe and judging the axial acoustic state; the strain gauge measures the strain of the elastic element of the pipeline, the strain gauge is transmitted to the data acquisition module and the data processing module through the junction box, and the acoustic state of the elastic element is formed and displayed on the display console according to the processing of corresponding calculation software.
2. The on-line acoustic state monitoring device according to claim 1, wherein each group of strain gauges is three, the strain gauges of the first group are arranged on the periphery of the flange at the outlet side of the vibration reduction connecting pipe, the two strain gauges are arranged along the periphery of the flange and form an included angle of 90 degrees, and the other strain gauge is arranged along the radial direction of the pipeline; the second group of strain gauges are arranged in the axial direction of the pipeline connected with the connecting pipe in a way that the two strain gauges are along the axial direction of the pipeline and form an included angle of 90 degrees, and the other strain gauge is perpendicular to the axial direction of the pipeline.
3. The on-line acoustic state monitoring device according to claim 1 or 2, wherein the monitoring device adopts a 1/4 wheatstone bridge to test the voltage change when the strain gauge is strained, obtains the strain of the tested piece according to the voltage change value, obtains the stress of the elastic element, calculates the acting force of the elastic element according to the stress of the elastic element, calculates the deformation state of the element according to the acting force of the elastic element, and finally obtains the acoustic parameters of the elastic element according to the acting force or the deformation state of the elastic element.
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| CN201811412876.1A CN109520830B (en) | 2018-11-23 | 2018-11-23 | Online monitoring device for acoustic state of pipeline elastic element |
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| CN201811412876.1A CN109520830B (en) | 2018-11-23 | 2018-11-23 | Online monitoring device for acoustic state of pipeline elastic element |
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| CN109520830B true CN109520830B (en) | 2024-03-08 |
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| CN110566471B (en) * | 2019-07-19 | 2021-04-20 | 中国船舶重工集团公司第七一九研究所 | Portable pump acoustic performance acquisition method based on functional parameters |
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