CN115200884B - Corrugated pipeline spectrum detection device and life detection method - Google Patents
Corrugated pipeline spectrum detection device and life detection method Download PDFInfo
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- CN115200884B CN115200884B CN202110384171.9A CN202110384171A CN115200884B CN 115200884 B CN115200884 B CN 115200884B CN 202110384171 A CN202110384171 A CN 202110384171A CN 115200884 B CN115200884 B CN 115200884B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of automobile detection, and particularly relates to a corrugated pipeline spectrum detection device and an automobile. The corrugated pipeline spectrum detection device comprises a plurality of telescopic rod sensor groups, an air inlet seat ring sleeved at the air inlet end of the corrugated pipe and an air outlet seat ring sleeved at the air outlet end of the corrugated pipe; each telescopic rod sensor group comprises a first telescopic rod sensor and a second telescopic rod sensor which are arranged at a first preset angle; the first telescopic rod sensors and the second telescopic rod sensors are arranged at intervals in a staggered manner; the first telescopic rod sensor and the second telescopic rod sensor between two adjacent telescopic rod sensor groups are arranged at a second preset angle; both ends of the first telescopic rod sensor and the second telescopic rod sensor are respectively hinged on the air inlet seat ring and the air outlet seat ring. According to the invention, the corrugated pipeline spectrum detection device is established based on a Stewart platform principle, and the fatigue life value of the corrugated pipe can be accurately obtained through analysis and calculation of displacement signals.
Description
Technical Field
The invention belongs to the technical field of automobile detection, and particularly relates to a corrugated pipeline spectrum detection device and a service life detection method.
Background
The exhaust system is an important component of an internal combustion engine automobile, and can not only discharge the waste output by the engine into the external environment, but also play a role in reducing the noise of the engine. Exhaust bellows are flexible devices in automotive exhaust systems, typically disposed in the piping of a catalyst assembly, that function to attenuate vibration transmission, reduce noise, and absorb large angular displacements.
The working environment of the exhaust corrugated pipe is very bad, and the exhaust corrugated pipe is required to bear the impact of high-temperature and high-pressure air flow, also is required to bear the vibration excitation transmitted by the engine and the road vibration excitation transmitted by the chassis system, and is required to bear the fatigue stress caused by alternating load due to frequent changes of the working condition of the engine and road conditions. Fatigue failure of the exhaust corrugated pipe can cause leakage of high-temperature fuel gas of the engine, the dynamic property of the engine is influenced by light weight, or the exhaust system of the engine is broken and falls off, and the fire disaster is caused by heavy weight. Therefore, fatigue durability analysis and life evaluation of the exhaust corrugated pipe are one of important links in the development of the current engine exhaust system.
In the prior art, the fatigue life analysis of the exhaust corrugated pipe is generally to paste stress flakes on the surface of the corrugated pipe, collect road spectrum signals in the running process of a real vehicle, and obtain the fatigue life of the exhaust corrugated pipe through the analysis of the road spectrum signals. However, since the surface structure of the exhaust bellows is complicated and uneven, it is difficult for the stress flakes to adhere perfectly to the surface of the bellows, and thus the current detection accuracy of the fatigue life of the bellows is low.
Disclosure of Invention
The invention solves the technical problems that the surface of the existing corrugated pipe is difficult to be stuck with stress flakes perfectly, the detection precision of the fatigue life of the corrugated pipe is low, and the like, and provides a corrugated pipeline spectrum detection device and a life detection method.
In view of the above problems, the embodiment of the invention provides a corrugated pipeline spectrum detection device, which comprises a plurality of telescopic rod sensor groups, an air inlet seat ring sleeved at the air inlet end of a corrugated pipe to be detected and an air outlet seat ring sleeved at the air outlet end of the corrugated pipe to be detected; each telescopic rod sensor group comprises a first telescopic rod sensor and a second telescopic rod sensor which are arranged at a first preset angle;
all the first telescopic rod sensors and the second telescopic rod sensors are arranged at staggered intervals; the first telescopic rod sensor and the second telescopic rod sensor between two adjacent telescopic rod sensor groups are arranged at a second preset angle;
the two ends of the first telescopic rod sensor and the second telescopic rod sensor are hinged to the air inlet seat ring and the air outlet seat ring respectively.
Optionally, the corrugated pipeline spectrum detection device further comprises a plurality of first air inlet hook joints and a plurality of first air outlet hook joints; one end of the first telescopic rod sensor is hinged with the air inlet seat ring through the first air inlet hook joint, and the other end of the first telescopic rod sensor is hinged with the air outlet seat ring through the first air outlet hook joint;
the corrugated pipeline spectrum detection device further comprises a plurality of second air inlet hook joints and a plurality of second air outlet hook joints; one end of the second telescopic rod sensor is hinged with the air inlet seat ring through the second air inlet hook joint, and the other end of the second telescopic rod sensor is hinged with the air outlet seat ring through the second air outlet hook joint.
Optionally, a plurality of air inlet fixed rod groups which are distributed in an annular shape at equal intervals are arranged on the air inlet seat ring, and a first air inlet fixed rod and a second air inlet fixed rod are arranged on the air inlet fixed rod groups; the air outlet seat is provided with a plurality of air outlet fixed rod groups which are distributed in an annular mode at equal intervals, and the air outlet fixed rod groups are provided with a first air outlet fixed rod and a second air outlet fixed rod;
the first air inlet hook joint comprises a first through hole and a second through hole which are arranged at a third preset angle; the first air outlet hook joint comprises a third through hole and a fourth through hole which are arranged at a third preset angle; the first air inlet hook joint is rotatably mounted on the air inlet seat ring through a first air inlet fixing rod inserted into the first through hole, and the first air outlet hook joint is rotatably mounted on the air outlet seat ring through a first air outlet fixing rod inserted into the third through hole; one end of the first telescopic rod sensor is inserted into the second through hole and hinged with the air inlet seat ring; the other end of the first telescopic rod sensor is inserted into the fourth through hole and hinged with the air outlet seat ring;
the second air inlet hook joint comprises a fifth through hole and a sixth through hole which are arranged at a third preset angle; the second air outlet hook joint comprises a seventh through hole and an eighth through hole which are arranged at a third preset angle; the second air inlet hook joint is rotatably mounted on the air inlet seat ring through a second air inlet fixing rod inserted into the fifth through hole, and the second air outlet hook joint is rotatably mounted on the air outlet seat ring through a second air outlet fixing rod inserted into the seventh through hole; one end of the second telescopic rod sensor is inserted into the sixth through hole and hinged with the air inlet seat ring; the other end of the second telescopic rod sensor is inserted into the eighth through hole and hinged with the air outlet seat ring.
Optionally, the third preset angle is 90 degrees.
Optionally, at least one first fixing through hole is formed in the air inlet seat ring, and the air inlet seat ring is installed at the air inlet end of the bellows to be tested through a first fixing piece inserted into the first fixing through hole;
the air outlet seat ring is provided with at least one second fixing through hole, and the air outlet seat ring is arranged at the air outlet end of the bellows to be tested through a second fixing piece inserted into the second fixing through hole.
Optionally, the corrugated pipeline spectrum detection device further comprises a data collector, and the data collector is connected with the first telescopic rod sensor and the second telescopic rod sensor.
The invention also provides a method for detecting the service life of the corrugated pipe, which is applied to the corrugated pipe spectrum detection device, and comprises the following steps:
acquiring displacement signal spectrums acquired by the first telescopic rod sensor and the second telescopic rod sensor;
acquiring the parameters of the air inlet and outlet ends of the bellows to be tested and the position parameters and the size parameters of the telescopic rod sensor group;
based on a Jacobian matrix forward solution algorithm, determining a displacement load spectrum of an air inlet end relative to an air outlet end of the bellows to be tested according to the air inlet end parameter, the air outlet end parameter, the position parameter, the size parameter and the displacement signal spectrum;
establishing a first finite element model of the bellows to be tested, and analyzing the first finite element model according to the displacement load spectrum to obtain a first stress load spectrum of the surface of the bellows to be tested;
acquiring a second stress load spectrum of the key structural points in the first stress load spectrum;
and acquiring a preset stress-life relation curve associated with the corrugated pipe to be tested, acquiring damage values of key structural points of the corrugated pipe to be tested according to the stress load spectrum and the preset stress-life relation curve, and determining the maximum damage value as the life value of the corrugated pipe to be tested.
Optionally, before the obtaining the preset stress-life relation curve associated with the bellows to be tested, the method further includes:
establishing a second finite element model of the bellows to be tested, obtaining a stress value corresponding to the second finite element model under the single axial displacement, and establishing a displacement-stress relation between the single axial displacement and the stress value;
acquiring a test stress value of the bellows to be tested for a fatigue endurance test, determining a test displacement value corresponding to the test stress value according to the displacement-stress relation, setting an independent axial displacement applied by the bellows to be tested for the fatigue endurance test as the test displacement value, and then acquiring a test life value corresponding to the test stress value;
and determining a stress-life relation curve of the corrugated pipe to be tested according to the test stress value and the test life value corresponding to the test stress value.
Optionally, the acquiring a second stress load spectrum of the key structural point in the first stress load spectrum includes:
the method comprises the steps of obtaining trough areas corresponding to an air inlet end and an air outlet end of a corrugated pipe to be tested in the first stress load spectrum, selecting a preset number of key structure points in all the obtained trough areas, and determining the stress load spectrum corresponding to the key structure points.
Optionally, the air inlet and outlet end parameters include an inner diameter of the air inlet end of the corrugated pipe and an inner diameter of the air outlet end of the corrugated pipe;
the position parameters comprise spatial angle values of the first telescopic rod sensor and the second telescopic rod sensor under a spatial coordinate system;
the dimensional parameter includes diameters of the first telescoping rod sensor and the second telescoping rod sensor.
In the invention, all the first telescopic rod sensors and the second telescopic rod sensors are arranged at intervals in a staggered way; the first telescopic rod sensor and the second telescopic rod sensor between two adjacent telescopic rod sensor groups are arranged at a second preset angle, and two ends of the first telescopic rod sensor and two ends of the second telescopic rod sensor are respectively hinged to the air inlet seat ring and the air outlet seat ring. The corrugated pipeline spectrum detection device is established based on a Stewart platform principle, on the basis that no stress sheet is attached to the corrugated pipe to be detected, the first telescopic rod sensor and the second telescopic rod sensor can collect the road spectrum signal of the corrugated pipe to be detected, and the fatigue life value of the corrugated pipe to be detected can be accurately obtained through analysis and calculation of the road spectrum signal. In addition, the corrugated pipeline spectrum detection device has the advantages of simple structure, convenient manufacture and disassembly and low manufacturing cost.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a device for detecting spectrum of a corrugated pipeline according to an embodiment of the present invention;
FIG. 2 is a front view of a bellows spectrum detection apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a corrugated pipeline spectrum detecting apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an air inlet ring of a corrugated pipeline spectrum detection device according to an embodiment of the present invention;
FIG. 5 is a front view of an inlet seat ring of a bellows spectrum sensing device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first air inlet hook of a corrugated pipeline spectrum detection device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram showing the distribution of a first telescopic rod sensor and a second telescopic rod sensor of a bellows spectrum detection apparatus according to an embodiment of the present invention;
FIG. 8 is a simplified schematic diagram of a bellows spectrum detection apparatus according to an embodiment of the present invention;
FIG. 9 is a flowchart of a bellows detection method according to an embodiment of the present invention;
fig. 10 is a flowchart of step S600 of a bellows detection method according to an embodiment of the present invention.
Reference numerals in the specification are as follows:
1. a telescopic rod sensor group; 11. a first telescopic rod sensor; 12. a second telescopic rod sensor; 2. an air inlet seat ring; 21. an air inlet fixed rod group; 211. a first air intake fixing rod; 212. a second air intake fixing rod; 22. a first fixing through hole; 3. an air outlet seat ring; 31. an air outlet fixed rod group; 311. a first air outlet fixing rod; 312. a second air outlet fixing rod; 4. a first air inlet hook joint; 41. a first through hole; 42. a second through hole; 5. a first air outlet Hooke joint; 6. a second air inlet hook joint; 7. a second air outlet Hooke joint; 8. a data collector; 10. bellows to be measured; 101. an air inlet end; 102. and an air outlet end.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the 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 for purposes of illustration only and are not intended to limit the scope of the invention.
It is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a corrugated pipe spectrum detection device, which includes a plurality of telescopic rod sensor groups 1, an air inlet seat ring 2 sleeved at an air inlet end 101 of a corrugated pipe 10 to be detected, and an air outlet seat ring 3 sleeved at an air outlet end 102 of the corrugated pipe 10 to be detected; each of the telescopic rod sensor groups 1 includes a first telescopic rod sensor 11 and a second telescopic rod sensor 12 (as shown in fig. 7) disposed at a first preset angle α; it can be appreciated that the first preset angle α may be set according to actual requirements, and the first telescopic rod sensor 11 may be a telescopic rod type sensor, or may be a form of attaching a stress sheet to a straight rod.
All the first telescopic rod sensors 11 and the second telescopic rod sensors 12 are arranged at staggered intervals; the first telescopic rod sensor 11 and the second telescopic rod sensor 12 between two adjacent telescopic rod sensor groups 1 are arranged at a second preset angle beta (shown in fig. 7); as can be appreciated, the second preset angle β may be set according to actual requirements, in each of the telescopic rod sensor groups 1, as shown in fig. 7, a distance between the first telescopic rod sensor 11 and the second telescopic rod sensor 12 facing one end of the air inlet seat ring 2 is greater than a distance between the first telescopic rod sensor 11 and the second telescopic rod sensor 12 facing one end of the air outlet seat ring 3, and is regarded as one telescopic rod sensor group 1, at this time, an included angle between the first telescopic rod sensor 11 and the second telescopic rod sensor 12 facing one end of the air inlet seat ring 2 is a first preset included angle α, and an angle between the first telescopic rod sensor 11 and the second telescopic rod sensor 12 of the adjacent telescopic rod sensor group 1 facing one end of the air outlet seat ring 3 is a second preset angle β; further, when the diameters of the air inlet seat ring 2 and the air outlet seat ring 3 are equal, the first preset included angle alpha is equal to the second preset angle beta; when the diameters of the air inlet seat ring 2 and the air outlet seat ring 3 are different, the first preset included angle alpha is not equal to the second preset angle beta.
Both ends of the first telescopic rod sensor 11 and the second telescopic rod sensor 12 are respectively hinged to the air inlet seat ring 2 and the air outlet seat ring 3. It will be appreciated that one end of each of the first telescopic rod sensor 11 and the second telescopic rod sensor 12 is hinged to the air inlet seat ring 2, and the other end of each of the first telescopic rod sensor 11 and the second telescopic rod sensor 12 is hinged to the air outlet seat ring 3.
In the invention, all the first telescopic rod sensors 11 and the second telescopic rod sensors 12 are arranged at staggered intervals; the first telescopic rod sensor 11 and the second telescopic rod sensor 12 between two adjacent telescopic rod sensor groups 1 are arranged at a second preset angle, and two ends of the first telescopic rod sensor 11 and two ends of the second telescopic rod sensor 12 are respectively hinged to the air inlet seat ring 2 and the air outlet seat ring 3. The corrugated pipeline spectrum detection device is established based on a Stewart platform principle, on the basis that no stress piece is attached to the corrugated pipe 100 to be detected, road spectrum signals of the corrugated pipe 100 to be detected can be acquired through the first telescopic rod sensor 11 and the second telescopic rod sensor 12, and fatigue life values of the corrugated pipe 10 to be detected can be accurately obtained through analysis and calculation of the road spectrum signals. In addition, the corrugated pipeline spectrum detection device has the advantages of simple structure, convenient manufacture and disassembly and low manufacturing cost.
In one embodiment, as shown in fig. 1, the corrugated pipe spectrum detection device further includes a plurality of first air inlet hook joints 4 and a plurality of first air outlet hook joints 5; one end of the first telescopic rod sensor 11 is hinged with the air inlet seat ring 2 through the first air inlet hook joint 4, and the other end of the first telescopic rod sensor 11 is hinged with the air outlet seat ring 3 through the first air outlet hook joint 5; it will be appreciated that the first inlet hook 4 may rotate about the inlet seat 2 or about the first telescopic rod sensor 11, and the first outlet hook 5 may rotate about the outlet seat 3 or about the first telescopic rod sensor 11.
The corrugated pipeline spectrum detection device further comprises a plurality of second air inlet hook joints 6 and a plurality of second air outlet hook joints 7; one end of the second telescopic rod sensor 12 is hinged with the air inlet seat ring 2 through the second air inlet hook joint 6, and the other end of the second telescopic rod sensor 12 is hinged with the air outlet seat ring 3 through the second air outlet hook joint 7. It will be appreciated that the second inlet hook 6 may rotate about the inlet seat 2 or about the second telescopic rod sensor 12, and the second outlet hook 7 may rotate about the outlet seat 3 or about the second telescopic rod sensor 12. In the invention, the first telescopic rod sensor 11 and the second telescopic rod sensor 12 are hinged between the air inlet seat ring 2 and the air outlet seat ring 3 through Hooke's hinge structure, and the corrugated pipeline spectrum detection device has the advantages of simple structure, low manufacturing cost and high detection precision.
In an embodiment, as shown in fig. 4 and fig. 5, the air intake seat ring 2 is provided with a plurality of air intake fixing rod groups 21 distributed at equal intervals in a ring shape, and the air intake fixing rod groups 21 are provided with a first air intake fixing rod 211 and a second air intake fixing rod 212; the air outlet seat ring 3 is provided with a plurality of air outlet fixing rod groups 31 which are distributed in an annular mode at equal intervals, and the air outlet fixing rod groups 31 are provided with a first air outlet fixing rod 311 and a second air outlet fixing rod 312; it will be appreciated that the radian value between two adjacent air inlet fixed rod groups 21 is equal, and the radian value between two adjacent air outlet fixed rod groups 31 is also equal; further, the radian value between two adjacent air inlet fixed rod groups 21 is equal to the radian value between two adjacent air outlet fixed rod groups 31.
As shown in fig. 6, the first air inlet hook 4 includes a first through hole 41 and a second through hole 42 disposed at a third preset angle; the first air outlet hook 5 comprises a third through hole and a fourth through hole which are arranged at a third preset angle; the first air inlet hook 4 is rotatably mounted on the air inlet seat ring 2 through a first air inlet fixing rod 211 inserted into the first through hole 41, and the first air outlet hook 5 is rotatably mounted on the air outlet seat ring 3 through a first air outlet fixing rod 311 inserted into the third through hole; one end of the first telescopic rod sensor 11 is inserted into the second through hole 42 and hinged with the air inlet seat ring 2; the other end of the first telescopic rod sensor 11 is inserted into the fourth through hole and hinged with the air outlet seat ring 3; it will be appreciated that the first air inlet hook 4 may rotate around the first air inlet fixing rod 211, also may rotate around the first telescopic rod sensor 11, and the first air outlet hook 5 may rotate around the first air outlet fixing rod 311, also may rotate around the first telescopic rod sensor 11.
The second air inlet hook 6 comprises a fifth through hole and a sixth through hole which are arranged at a third preset angle; the second air outlet hook joint 7 comprises a seventh through hole and an eighth through hole which are arranged at a third preset angle; the second air inlet hook 6 is rotatably mounted on the air inlet seat ring 2 through a second air inlet fixing rod 212 inserted into the fifth through hole, and the second air outlet hook 7 is rotatably mounted on the air outlet seat ring 3 through a second air outlet fixing rod 312 inserted into the seventh through hole; one end of the second telescopic rod sensor 12 is inserted into the sixth through hole and hinged with the air inlet seat ring 2; the other end of the second telescopic rod sensor 12 is inserted into the eighth through hole and hinged with the air outlet seat ring 3. It will be appreciated that the second inlet hook 6 may rotate about the second inlet rod 212 or about the second telescopic rod sensor 12, and the second outlet hook 7 may rotate about the second outlet rod 312 or about the second telescopic rod sensor 12. Further, the third preset angle may be set according to actual requirements, and preferably, the third preset angle is 90 degrees. In the invention, the corrugated pipeline spectrum detection device has the advantages of simple structure, low manufacturing cost and convenient disassembly and assembly.
In one embodiment, as shown in fig. 1 and 4, the air inlet seat ring 2 is provided with at least one first fixing through hole 22, and the air inlet seat ring is mounted on the air inlet end 101 of the bellows 10 to be tested through a first fixing piece inserted into the first fixing through hole 22; it will be appreciated that the number of the first fixing through holes 22 may be set according to actual requirements (for example, set to 3, 4, etc.); preferably, 3 first fixing through holes 22 are uniformly and equidistantly arranged on the air inlet seat ring 2, and one first fixing through hole 22 is arranged between two adjacent air inlet fixing rod groups 21. And, the first fixing member includes, but is not limited to, a fastening bolt or the like.
The air outlet seat ring 3 is provided with at least one second fixing through hole, and the air outlet seat ring is installed at the air outlet end 102 of the bellows 10 to be tested through a second fixing piece inserted into the second fixing through hole. It may be appreciated that the number of the second fixing through holes may be set according to actual requirements (for example, set to 3, 4, etc.); preferably, 3 second fixing through holes are uniformly and equidistantly arranged on the air outlet seat ring 3, and one second fixing through hole is arranged between two adjacent air outlet fixing rod groups 31. And, the second fixing member includes, but is not limited to, a fastening bolt or the like. In the invention, the stability of the corrugated pipeline spectrum detection device mounted on the corrugated pipe 10 to be detected is high, and the manufacturing cost is low.
In an embodiment, as shown in fig. 3, the bellows spectrum detection apparatus further includes a data collector 8, and the data collector 8 is connected to the first telescopic rod sensor 11 and the second telescopic rod sensor 12. It will be appreciated that the data collector 8 may collect the displacement signal spectrum collected by the first telescopic rod sensor 11 and the second telescopic rod sensor 12.
Specifically, as shown in fig. 1 to 3, the corrugated pipeline spectrum detection device comprises 3 groups of telescopic rod sensor groups 1, 3 first air inlet hook joints 4, 3 first air outlet hook joints 5, 3 second air inlet hook joints 6 and 3 second air outlet hook joints 7; 3 air inlet fixed posts are uniformly arranged on the air inlet seat ring 2, and 3 air outlet fixed posts are uniformly arranged on the air outlet seat ring 3; the 3 first telescopic rod sensors 11 and the 3 second telescopic rod sensors 12 are hinged between the air inlet seat ring 2 and the air outlet seat ring 3, and form a detection structure based on a Stewart platform.
As shown in fig. 9, another embodiment of the present invention further provides a method for detecting a lifetime of a bellows, which is applied to the above-mentioned device for detecting a spectrum of a bellows pipeline, where the method for detecting a lifetime of a bellows includes:
s100, acquiring displacement signal spectrums acquired by the first telescopic rod sensor 11 and the second telescopic rod sensor 12 (the displacement signal spectrums are the telescopic amounts of the first telescopic rod sensor 11 and the second telescopic rod sensor 12 in a period of time); it will be appreciated that the bellows spectrum detection device is mounted on the bellows 10 to be detected, by means of displacement signals of the actual vehicle running.
S200, acquiring parameters of an air inlet and outlet end 102 of the corrugated pipe 10 to be tested and position parameters and dimension parameters of the telescopic rod sensor group 1; specifically, the parameters of the air inlet and outlet end 102 include, but are not limited to, the inner diameter of the air inlet end 101 of the bellows 10 to be measured and the inner diameter of the air outlet end 102 of the bellows 10 to be measured. The position parameters are not limited to the spatial angle values of the first telescopic rod sensor 11 and the second telescopic rod sensor 12 in a spatial coordinate system; as shown in fig. 8, the specific algorithm of the spatial angle value is: establishing a space coordinate X axis, a space coordinate Y axis and a space coordinate Z axis in space, and respectively solving an included angle between the opposite ends of the first telescopic rod sensor 11 and the X axis, an included angle between the first telescopic rod sensor and the Y axis and an included angle between the first telescopic rod sensor and the Z axis; and also calculate the angles between the opposite ends of the second telescopic rod sensor 12 and the X axis, the angles between the second telescopic rod sensor and the Y axis, and the angles between the second telescopic rod sensor and the Z axis. The dimensional parameters are not limited to the diameters of the first telescopic rod sensor 11 and the second telescopic rod sensor 12. Further, the parameters of the air inlet and outlet end 102 are determined according to the structure of the bellows 10 to be tested, the position parameters are determined according to the spatial positions of the first telescopic rod sensor 11 and the second telescopic rod sensor 12, the size parameters are determined according to the structural sizes of the first telescopic rod sensor 11 and the second telescopic rod sensor 12, and the parameters of the air inlet and outlet end 102, the position parameters and the size parameters can be parameters stored in a database in advance and can be directly retrieved from the database when to be tested.
S300, based on a Jacobian matrix forward solution algorithm, determining a displacement load spectrum of an air inlet end 101 of the corrugated pipe 10 to be tested relative to an air outlet end 102 according to the air inlet end 102 parameter, the position parameter, the size parameter and the displacement signal spectrum; specifically, according to the jacobian matrix forward solution algorithm, the parameters of the air inlet and outlet ends 102, the position parameters, the dimension parameters and the displacement signal spectrum are input by using software such as MATLAB, so that a displacement load spectrum of the air inlet end 101 of the bellows 10 to be measured relative to the air outlet end 102 can be solved, wherein the displacement load spectrum is a variable of a plane of the air inlet end 101 of the bellows 10 to be measured relative to a plane of the air outlet end 102 in six degrees of freedom in space within a period of time.
S400, a first finite element model of the corrugated pipe 10 to be tested is established, and the first finite element model is analyzed according to the displacement load spectrum to obtain a first stress load spectrum of the surface of the corrugated pipe 10 to be tested; specifically, software such as Nastran or ABAQUS may be used to build the first finite element model of the bellows 10 to be tested, the displacement load spectrum is used as load input, and the first stress load spectrum of the surface of the bellows 10 to be tested can be obtained through software calculation. The first stress distribution spectrum is a stress distribution parameter of the surface of the bellows 10 to be measured in a period of time.
S500, acquiring a second stress load spectrum of a key structural point in the first stress load spectrum; it will be appreciated that the joint structure points are stress concentration areas in the bellows 10 to be measured, that is, points where the stress is greater in the bellows 10 to be measured. And the second stress distribution spectrum is a stress distribution parameter of key structural points of the bellows 10 to be tested in a period of time.
Further, the obtaining a second stress load spectrum of the key structural points in the first stress load spectrum, that is, S500, includes:
the method comprises the steps of obtaining trough areas corresponding to an air inlet end 101 and an air outlet end 102 of the corrugated pipe 10 to be tested in the first stress load spectrum, selecting a preset number of key structure points in all the obtained trough areas, and determining a second stress load spectrum corresponding to the key structure points. It will be appreciated that the valley regions are regions where stress is concentrated on the bellows (i.e., regions where stress is greater on the bellows 10 to be tested), and multiple valley regions may be selected in the first stress load spectrum, and a predetermined number of key structural points may be selected in each valley region. In the invention, the air inlet end 101 and the air outlet end 102 of the corrugated pipe 10 to be detected are selected as the selected areas of the key structural points, and the detection precision of the corrugated pipe 10 to be detected is improved due to the fact that the stress of the air inlet end 101 and the air outlet end 102 of the selected corrugated pipe is larger.
S600, acquiring a preset stress-life relation curve associated with the corrugated pipe 10 to be tested, acquiring damage values of key structural points of the corrugated pipe 10 to be tested according to the stress load spectrum and the preset stress-life relation curve, and determining the maximum damage value as the life value of the corrugated pipe 10 to be tested. It can be appreciated that the preset stress-life relationship is a stress-life relationship of the material of the bellows 10 to be tested, the preset stress-life relationship may be stored in a database, and the preset stress-life relationship may be retrieved from the database during the experiment. Specifically, the stress load spectrum and the preset stress-life relation curve are taken as input, and a Miner criterion and a rain flow analysis method are adopted to calculate damage values based on stress through software such as nCode or TecWare, so as to obtain damage values of key points of each structure, and the maximum damage value is determined as the life value of the corrugated pipe 10 to be tested due to different sizes of the damage values, namely, the damage value of the weakest part of the structure of the corrugated pipe 10 to be tested is determined as the life value of the corrugated pipe 10 to be tested.
In the invention, the preset stress-life relation curve associated with the corrugated pipe 10 to be tested is only related to the material property of the corrugated pipe 10 to be tested, but not related to the structure of the corrugated pipe 10 to be tested; the stress load spectrum is determined by combining finite element analysis and software technology with displacement signal spectrums measured by the first telescopic rod sensor 11 and the second telescopic rod sensor 12; and obtaining damage values of key structural points of the corrugated pipe 10 to be tested according to the stress load spectrum and the preset stress-service life relation curve, and determining the maximum damage value as the service life value of the corrugated pipe 10 to be tested. The bellows service life detection method is high in universality and detection accuracy.
In one embodiment, as shown in fig. 10, before the obtaining the preset stress-lifetime relationship curve associated with the bellows 10 to be tested, the method further includes:
s610, establishing a second finite element model of the corrugated pipe 10 to be tested, acquiring a stress value corresponding to the second finite element model under the single axial displacement, and establishing a displacement-stress relation between the single axial displacement and the stress value; it is understood that the individual axial displacement refers to compressing or stretching the bellows 10 to be measured in the axial direction of the bellows 10 to be measured. Specifically, the second finite element model may be built by using software such as Nastran or ABAQUS, and the displacement-stress relationship may be output by applying a single axial displacement (a plurality of data) to the second finite element model in Nastran or ABAQUS.
S620, acquiring a test stress value of the bellows 10 to be tested for a fatigue endurance test, determining a test displacement value corresponding to the test stress value according to the displacement-stress relation, setting the independent axial displacement applied by the bellows 10 to be tested for the fatigue endurance test as the test displacement value, and then acquiring a test life value corresponding to the test stress value; as can be appreciated, the actual fatigue endurance test is performed on the bellows 10 to be tested, since the test stress value cannot be applied to the bellows 10 to be tested in the fatigue endurance test, but the test displacement value under the corresponding test stress value is obtained from the displacement-stress relationship, and the test life value corresponding to the test stress value can be obtained by applying the test displacement value to the bellows 10 to be tested,
and S630, determining a preset stress-service life relation curve of the corrugated pipe 10 to be tested according to the test stress value and the test service life value corresponding to the test stress value. It will be appreciated that a plurality of test stress values need to be selected, so that a corresponding plurality of test life values can be obtained through a fatigue endurance test, thereby establishing a preset stress-life relationship curve of the bellows 10 to be tested.
In the invention, the preset stress-life relation curve is obtained through the independent axial displacement to obtain the displacement-stress relation of the corrugated pipe 10 to be tested, and is determined through the fatigue endurance test according to the displacement-stress relation, so that when the fatigue endurance test of the corrugated pipe 10 to be tested is carried out, the corrugated pipe 10 to be tested is only required to be excited from the axial direction, the time multiaxial complex excitation of the corrugated pipe 10 to be tested is not required, the fatigue endurance test of the corrugated pipe 10 to be tested is simplified, and the bench structure of the fatigue endurance test of the corrugated pipe 10 to be tested is simplified.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The corrugated pipeline spectrum detection device is characterized by comprising a plurality of telescopic rod sensor groups, an air inlet seat ring sleeved at the air inlet end of a corrugated pipe to be detected and an air outlet seat ring sleeved at the air outlet end of the corrugated pipe to be detected; each telescopic rod sensor group comprises a first telescopic rod sensor and a second telescopic rod sensor which are arranged at a first preset angle;
all the first telescopic rod sensors and the second telescopic rod sensors are arranged at staggered intervals; the first telescopic rod sensor and the second telescopic rod sensor between two adjacent telescopic rod sensor groups are arranged at a second preset angle;
the two ends of the first telescopic rod sensor and the second telescopic rod sensor are hinged to the air inlet seat ring and the air outlet seat ring respectively.
2. The corrugated pipe spectrum detection apparatus according to claim 1, further comprising a plurality of first inlet hook joints and a plurality of first outlet hook joints; one end of the first telescopic rod sensor is hinged with the air inlet seat ring through the first air inlet hook joint, and the other end of the first telescopic rod sensor is hinged with the air outlet seat ring through the first air outlet hook joint;
the corrugated pipeline spectrum detection device further comprises a plurality of second air inlet hook joints and a plurality of second air outlet hook joints; one end of the second telescopic rod sensor is hinged with the air inlet seat ring through the second air inlet hook joint, and the other end of the second telescopic rod sensor is hinged with the air outlet seat ring through the second air outlet hook joint.
3. The corrugated pipeline spectrum detection device according to claim 2, wherein a plurality of air inlet fixed rod groups which are distributed in an annular mode at equal intervals are arranged on the air inlet seat ring, and a first air inlet fixed rod and a second air inlet fixed rod are arranged on the air inlet fixed rod groups; the air outlet seat is provided with a plurality of air outlet fixed rod groups which are distributed in an annular mode at equal intervals, and the air outlet fixed rod groups are provided with a first air outlet fixed rod and a second air outlet fixed rod;
the first air inlet hook joint comprises a first through hole and a second through hole which are arranged at a third preset angle; the first air outlet hook joint comprises a third through hole and a fourth through hole which are arranged at a third preset angle; the first air inlet hook joint is rotatably mounted on the air inlet seat ring through a first air inlet fixing rod inserted into the first through hole, and the first air outlet hook joint is rotatably mounted on the air outlet seat ring through a first air outlet fixing rod inserted into the third through hole; one end of the first telescopic rod sensor is inserted into the second through hole and hinged with the air inlet seat ring; the other end of the first telescopic rod sensor is inserted into the fourth through hole and hinged with the air outlet seat ring;
the second air inlet hook joint comprises a fifth through hole and a sixth through hole which are arranged at a third preset angle; the second air outlet hook joint comprises a seventh through hole and an eighth through hole which are arranged at a third preset angle; the second air inlet hook joint is rotatably mounted on the air inlet seat ring through a second air inlet fixing rod inserted into the fifth through hole, and the second air outlet hook joint is rotatably mounted on the air outlet seat ring through a second air outlet fixing rod inserted into the seventh through hole; one end of the second telescopic rod sensor is inserted into the sixth through hole and hinged with the air inlet seat ring; the other end of the second telescopic rod sensor is inserted into the eighth through hole and hinged with the air outlet seat ring.
4. The corrugated pipe spectrum detection apparatus according to claim 3, wherein the third preset angle is 90 degrees.
5. The corrugated pipe spectrum detection device according to claim 1, wherein the air inlet seat ring is provided with at least one first fixing through hole, and the air inlet seat ring is arranged at the air inlet end of the corrugated pipe to be detected through a first fixing piece inserted into the first fixing through hole;
the air outlet seat ring is provided with at least one second fixing through hole, and the air outlet seat ring is arranged at the air outlet end of the bellows to be tested through a second fixing piece inserted into the second fixing through hole.
6. The corrugated pipe spectrum detection apparatus of claim 1, further comprising a data collector connecting the first telescoping rod sensor and the second telescoping rod sensor.
7. A bellows life detection method, which is applied to the bellows line spectrum detection apparatus according to any one of claims 1 to 6, comprising:
acquiring displacement signal spectrums acquired by the first telescopic rod sensor and the second telescopic rod sensor;
acquiring the parameters of the air inlet and outlet ends of the bellows to be tested and the position parameters and the size parameters of the telescopic rod sensor group;
based on a Jacobian matrix forward solution algorithm, determining a displacement load spectrum of an air inlet end relative to an air outlet end of the corrugated pipe to be measured according to the air inlet end parameter, the air outlet end parameter, the position parameter, the size parameter and the displacement signal spectrum;
establishing a first finite element model of the bellows to be tested, and analyzing the first finite element model according to the displacement load spectrum to obtain a first stress load spectrum of the surface of the bellows to be tested;
acquiring a second stress load spectrum of the key structural points in the first stress load spectrum;
and acquiring a preset stress-life relation curve associated with the corrugated pipe to be tested, acquiring damage values of key structural points of the corrugated pipe to be tested according to the stress load spectrum and the preset stress-life relation curve, and determining the maximum damage value as the life value of the corrugated pipe to be tested.
8. The method for detecting the life of a bellows according to claim 7, further comprising, before the step of obtaining the preset stress-life relationship curve associated with the bellows to be detected:
establishing a second finite element model of the bellows to be tested, obtaining a stress value corresponding to the second finite element model under the single axial displacement, and establishing a displacement-stress relation between the single axial displacement and the stress value;
acquiring a test stress value of the bellows to be tested for a fatigue endurance test, determining a test displacement value corresponding to the test stress value according to the displacement-stress relation, setting an independent axial displacement applied by the bellows to be tested for the fatigue endurance test as the test displacement value, and then acquiring a test life value corresponding to the test stress value;
and determining a preset stress-life relation curve of the corrugated pipe to be tested according to the test stress value and the test life value corresponding to the test stress value.
9. The method of claim 7, wherein the obtaining a second stress load spectrum of key structural points in the first stress load spectrum comprises:
the method comprises the steps of obtaining trough areas corresponding to an air inlet end and an air outlet end of a corrugated pipe to be tested in the first stress load spectrum, selecting a preset number of key structure points in all the obtained trough areas, and determining a second stress load spectrum corresponding to the key structure points.
10. The method of claim 7, wherein the inlet and outlet port parameters include an inner diameter of the inlet port of the bellows and an inner diameter of the outlet port of the bellows;
the position parameters comprise spatial angle values of the first telescopic rod sensor and the second telescopic rod sensor under a spatial coordinate system;
the dimensional parameter includes diameters of the first telescoping rod sensor and the second telescoping rod sensor.
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| CN112461145A (en) * | 2020-09-10 | 2021-03-09 | 河南平高电气股份有限公司 | Deformation monitoring system of pull rod type corrugated pipe |
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| US5115675A (en) * | 1990-06-15 | 1992-05-26 | The Slope Indicator Company | Tensioned bellows pressure transducer |
| CN105403157A (en) * | 2015-12-03 | 2016-03-16 | 国家电网公司 | Corrugated pipe assembly |
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