CN114739614A - Test device for testing pressure pulsation and vibration response of pipeline and test method thereof - Google Patents
Test device for testing pressure pulsation and vibration response of pipeline and test method thereof Download PDFInfo
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- CN114739614A CN114739614A CN202210569591.9A CN202210569591A CN114739614A CN 114739614 A CN114739614 A CN 114739614A CN 202210569591 A CN202210569591 A CN 202210569591A CN 114739614 A CN114739614 A CN 114739614A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01M7/025—Measuring arrangements
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Abstract
The invention provides a test device for testing pressure pulsation and vibration response of a pipeline and an experimental method thereof. The invention can test the pressure pulsation correspondence of various typical structures of different pipelines so as to further test the transmission rules of the typical structures at different pressure levels and pulsation amplitudes, the pressure water hammer amplitude during valve opening and closing and the vibration acceleration and strain response of the typical structures of the pipelines under different pulsation working conditions.
Description
Technical Field
The invention mainly relates to the technical field of aerospace aircrafts, in particular to a test device for testing pressure pulsation and vibration response of a pipeline and an experimental method thereof.
Background
The hydraulic pipeline system (including valve, joint and oil filter) in the aerospace craft is a power transmission structure widely used. When the system operates, oil in the pipeline flows under the driving of the pressure provided by the hydraulic pump, flows through various pipelines, accessories, load actuators and the like, and finally returns to the oil tank to form a loop, so that the requirement on the control function of the aircraft is met.
Due to the reciprocating oil sucking and discharging action of the pump, pressure pulsation can be generated in the oil liquid inside the pump, and the pulsation can be transmitted along a guide pipe path along with the flowing of the pressure oil liquid, so that the pressure pulsation in a pipeline system changes along with different pipeline layouts, and meanwhile, the pipeline can be subjected to flow-induced vibration. The flow-induced vibration can cause the structure to generate the action effects of alternating fatigue stress, resonance, fluid-solid coupling, fretting wear of a pipe joint and the like, and the action effects are not only the main causes of the 'leakage, overflow and leakage' fault of a pipeline system, but also the main causes of the functional abnormalities of the fluid pressure, the flow resistance and the like of the system. Therefore, researching the pressure pulsation characteristics of a typical pipeline structure and the vibration response rule caused by the pressure pulsation characteristics are important links of the design of the aircraft pipeline.
At present, most of pressure pulsation characteristics and vibration responses of pipeline systems are theoretical method researches, and most of research and development efforts of test devices are devices for reducing pressure pulsation, for example: an intelligent active control type high-pressure pipeline pressure pulsation damping device and method (CN202011520204. X), a frequency division combined pressure pulsation damping device and method (CN 202010584632.2), etc. Moreover, the pressure pulsation test and the vibration response test are often separated, for example, an aircraft fuel pipeline pressure pulsation system (CN 202020032372.3), a pressure pulsation analysis method, a device, a computer device and a storage medium (CN 202010422855.9), a hydraulic pipeline vibration test bench (CN 202011301782.4), a fluid pipeline vibration characteristic test device (CN 210834067U) and the like, some of the above inventions are a pressurization mode (non-flow) of liquid filling blockage on the realization of pressure pulsation, the liquid in the pipeline cannot flow, and the corresponding flow-induced vibration response law is difficult to obtain. In the aspect of a test method and a device for correlating pressure pulsation and vibration, patent queries include: a correlation test analysis method (CN 202011109578.2) of turbine runner vibration and pressure pulsation has a great difference between the object and the structure of an aircraft pipeline.
Disclosure of Invention
The invention mainly provides a test device for testing pressure pulsation and vibration response of a pipeline and an experimental method thereof, which are used for solving the technical problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a test device of test pipeline pressure pulsation and vibration response, includes high-pressure oil pump, high-pressure oil pump's input is connected with the oil tank, the input of oil tank is connected with pressure regulating mechanism, pressure regulating mechanism's output is connected with oil and strains, the input that oil was strained is connected with the testpieces, the input of testpieces is connected with high-pressure oil pump's output, the testpieces is connected with the data acquisition appearance electricity.
Further, the test piece includes that the input passes through the pipeline with the high-pressure oil pump is connected, the output pass through the pipeline with the test pipeline that the oil strained and be connected, connect the entry pressure sensor on the pipeline between high-pressure oil pump and test pipeline, connect the export pressure sensor in the pipeline of being connected between test pipeline and the oil strain.
Furthermore, the test piece also comprises an acceleration sensor arranged on the outer surface of the test pipeline and a strain gauge arranged on the outer surface of the test pipeline.
Further, the surface of test pipeline runs through there is the support rack, the support rack is including being used for supporting the fixed bolster of the pipeline of being connected between test pipeline and the high-pressure oil pump, and be used for supporting the movable support of the pipeline of being connected between test pipeline and the oil filter, one side surface mounting of fixed bolster has the confession support the first coupling that the pipeline of being connected alternates between test pipeline and the high-pressure oil pump, be equipped with first spout on the casing of fixed bolster, the bottom of first spout is equipped with locates fixed bolster a lateral surface's first scale.
Further, a side surface of the movable support is embedded with a first sliding block, the movable support is connected with the first sliding groove in a sliding mode through the first sliding block, a second sliding groove is formed in the movable support shell, one side of the second sliding groove is provided with a second graduated scale which is arranged on one side surface of the movable support, a second sliding block is connected in the groove body of the second sliding groove in a sliding mode, and a second pipe joint is installed on the shell of the second sliding block.
Furthermore, the pressure regulating mechanism comprises a first tee joint connected with the input end of the oil tank through a pipeline, the input end of the first tee joint is respectively connected with a pressure regulating valve and a hand valve through hoses, the pressure regulating valve and the hand valve are connected with a second tee joint through pipelines, and the second tee joint is connected with the input end of the oil filter through a pipeline.
According to the technical scheme of the test device for testing the pressure pulsation and the vibration response of the pipeline, the test method for the test device for testing the pressure pulsation and the vibration response of the pipeline is further provided, and comprises the following steps:
connecting the output end of a test piece with an oil filter, connecting the output end of the oil filter with a pressure regulating mechanism, connecting the output end of the pressure regulating mechanism with an oil tank, connecting the output end of the oil tank with a high-pressure oil pump, and connecting the output end of the high-pressure oil pump with the test piece to form a loop;
starting the high-pressure oil pump to pump oil in the oil tank out, and conveying the oil to pass through the test piece, the oil filter and the pressure regulating mechanism in sequence until the oil flows back to the oil tank;
step three, adjusting the pressure level of the oil conveyed in the step two through a pressure adjusting mechanism to enable pressure pulsation under a specified pressure level to be generated in the loop;
and step four, acquiring data through a data acquisition instrument electrically connected with the loop to obtain the pressure pulsation transfer characteristic of the test piece, the flow resistance characteristic of the test piece, the out-plane and in-plane vibration acceleration responses of the test piece under different pressure pulsations and the out-plane and in-plane vibration strain responses of the test piece under different pressure pulsations.
Further, in the fourth step, the data acquisition instrument is electrically connected with the loop to obtain the pressure pulsation transmission characteristic and the flow resistance characteristic of the test piece, and the method comprises the following substeps:
the method comprises the following steps that firstly, a data acquisition instrument is connected with an inlet pressure sensor and an outlet pressure sensor;
secondly, obtaining a pressure fluctuation curve P1 at the inlet of the test pipeline and a pressure fluctuation curve P2 at the outlet of the test pipeline through a data acquisition instrument;
and thirdly, analyzing and comparing the amplitude relation of the P1 and the P2 obtained by the second part to obtain the pressure pulsation transfer characteristic of the measured object, obtaining the amplitude change result of the pressure or the pressure pulsation, and analyzing the flow resistance characteristic of the measured object according to a related theory.
Further, in the fourth step, the data acquisition instrument is electrically connected with the loop to obtain out-of-plane and in-plane vibration acceleration responses of the test piece under different pressure pulsations, and the method comprises the following substeps:
firstly, adhering an acceleration sensor to the outer surface of a test pipeline, wherein the adhering positions are spaced by 90 degrees along the section of the pipeline;
and secondly, connecting the acceleration sensor with a data acquisition instrument, starting a system and starting testing to obtain out-of-plane and in-plane vibration acceleration responses of the tested object under different pressure pulsations.
Further, in the fourth step, the data acquisition instrument is electrically connected with the loop to obtain out-of-plane and in-plane vibration strain responses of the test piece under different pressure pulsations, and the method comprises the following substeps;
firstly, respectively sticking two strain gauges along the axial direction of a pipeline at positions 5mm close to a first pipe joint and a second pipe joint, wherein two adjacent strain gauges are stuck along the section of the pipeline at an interval of 90 degrees;
and secondly, connecting the system with a data acquisition instrument through a lead, starting the system and starting testing to obtain out-of-plane and in-plane vibration strain responses of the tested object under different pressure pulsations.
Compared with the prior art, the invention has the beneficial effects that:
the device can test the pressure pulsation correspondence of various different pipeline typical structures, further analyze the relevance between the fluid pulsation in the pipeline typical structure and the structural vibration response by further testing the transmission rules of the typical structures at different pressure levels and pulsation amplitudes, the pressure water hammer amplitude during valve opening and closing and the vibration acceleration and strain response of the pipeline typical structure under different pulsation working conditions, and provide reference for analyzing the flow resistance and the flow-induced vibration characteristics of different structural forms of aircraft hydraulic or engine pipelines.
The present invention will be explained in detail below with reference to the drawings and specific embodiments.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is a schematic structural view of a support stand according to the present invention;
FIG. 3 is a side view of the mobile bracket of the present invention;
FIG. 4 is a schematic illustration of an acceleration test of flow induced vibration of a test piece according to the present invention;
FIG. 5 is a schematic diagram of a vibrational strain response test of a test object of the test piece of the present invention;
FIG. 6 is a schematic diagram of an exemplary circuit of the present invention;
FIG. 7 is a schematic diagram of the present invention for testing the variation of pressure pulsations in a pipeline;
FIG. 8 is a schematic view of the test line first coupling pressure pulsation variation of the present invention;
FIG. 9 is a schematic representation of the variation in pressure pulsations for a second coupling of the test line of the present invention;
FIG. 10 is a graph of steady state, slow valve closing, and fast valve closing pulsation curves according to the present invention;
FIG. 11 is a graph of the dynamic strain response of a straight tube sample at a pressure level of 5 MPa;
FIG. 12 is a graph showing the dynamic strain response of a straight tube sample at a pressure level of 10 MPa;
FIG. 13 is a graph of the dynamic strain response of a straight tube sample at a pressure level of 15 MPa;
FIG. 14 is a change rule of strain gauges caused by slow valve closing and fast valve closing of a straight pipe under a pressure level of 15 MPa;
FIG. 15 is a graph of acceleration and strain response effects of a quick-closing valve;
FIG. 16 is a graph showing the vibration response of a straight tube sample at 15MPa pressure level when the valve is closed rapidly.
In the figure: 10. a high-pressure oil pump; 20. an oil tank; 30. a pressure regulating mechanism; 31. a first tee joint; 32. a pressure regulating valve; 33. a hand valve; 34. a second tee joint; 40. oil filtration; 50. a test piece; 51. testing the pipeline; 52. an inlet pressure sensor; 53. a support stand; 531. a fixed bracket; 532. a movable support; 533. a first pipe joint; 534. a first chute; 535. a first scale; 536. a first slider; 537. a second chute; 538. a second slider; 539. a second pipe joint; 53a, a second graduated scale; 54. an outlet pressure sensor; 55. an acceleration sensor; 56. a strain gauge; 60. a data acquisition instrument.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In an embodiment, referring to fig. 1 to 17, a test apparatus for testing pressure pulsation and vibration response of a pipeline includes a high-pressure oil pump 10, an input end of the high-pressure oil pump 10 is connected to an oil tank 20, an input end of the oil tank 20 is connected to a pressure regulating mechanism 30, an output end of the pressure regulating mechanism 30 is connected to an oil filter 40, an input end of the oil filter 40 is connected to a test piece 50, an input end of the test piece 50 is connected to an output end of the high-pressure oil pump 10, and the test piece 50 is electrically connected to a data acquisition instrument 60;
further, the test piece 50 includes a test pipeline 51 having an input end connected to the high-pressure oil pump 10 through a pipeline and an output end connected to the oil filter 40 through a pipeline, an inlet pressure sensor 52 connected to the pipeline between the high-pressure oil pump 10 and the test pipeline 51, and an outlet pressure sensor 54 connected to the pipeline between the test pipeline 51 and the oil filter 40;
further, the test piece 50 further comprises an acceleration sensor 55 mounted on the outer surface of the test pipeline 51, and a strain gauge 56 mounted on the outer surface of the test pipeline 51;
the pressure regulating mechanism 30 comprises a first tee joint 31 connected with the input end of the oil tank 20 through a pipeline, the input end of the first tee joint 31 is respectively connected with a pressure regulating valve 32 and a hand valve 33 through hoses, the pressure regulating valve 32 and the hand valve 33 are connected with a second tee joint 34 through pipelines, and the second tee joint 34 is connected with the input end of an oil filter 40 through a pipeline;
it should be noted that, in the present embodiment, the high-pressure oil pump 10 cooperates with a higher motor rotation speed to complete a fast oil suction and discharge operation through the high-speed rotation of the motor, so as to maintain the pressure of the system and generate continuous pressure pulsation;
furthermore, the capacity of the oil tank 20 should be determined according to the capacity of all pipelines of the loop and the flow requirement of the high-pressure oil pump, the oil tank 20 is connected with the high-pressure oil pump 10 through a hose, the high-pressure oil pump 10 extracts oil from the oil tank 20, and then the oil returns to the oil tank after flowing through the test section and all pipeline loops. The above steps are repeated, so that not only is the flow of high-pressure fluid in the pipeline realized, but also the cyclic utilization of oil and the continuous work of the system can be realized. An oil filling port is formed in the oil tank 20, and oil is added through the oil filling port after the oil is lost; a liquid display bar is arranged on the side surface of the oil tank 20, so that the height of the current oil in the oil tank 20 can be displayed, and the liquid can be added in time if the oil is monitored to be insufficient;
further, the hand valve 33 is used for manually adjusting a fast switch valve or a slow switch valve of the valve to simulate the fast or slow opening and closing of load actuation in a hydraulic pipeline system of an actual aircraft, so that the system can simulate the water hammer phenomenon under different opening and closing valve speeds
Further, the pressure regulating valve 32 is used for setting a pressure level required by the test, a pressure gauge is used for monitoring the actual pressure in the current pipeline, and the pressure regulating valve can also play a role in protecting the system pressure;
further, the oil filter 40 is used for filtering oil liquid impurities in the loop, and the oil filter is required to be installed behind the section to be detected due to the effect of the filtering pressure;
further, the pressure of a typical pipeline structure and the pressure pulsation transmission characteristics thereof under different pressure levels can be obtained, as long as different typical pipeline structures are connected to a test section in a loop, the high-pressure oil pump 10 is started to form a flowing loop circulation, hydraulic oil with pressure and pressure pulsation flows out of the pump, the pressure level required by the test is set through the pressure regulating valve 32, fluid flow and pressure pulsation of the pressure required by the test occur in the loop and flow through the test section, and pressure, acceleration and strain data of a tested object are obtained through the data acquisition instrument 60 in the test section, namely, pressure pulsation and flow-induced vibration responses of different typical pipeline structures are obtained.
The steady-state pressure pulsation of the inlet (the first pipe joint 533) and the outlet (the second pipe joint 539) of the straight pipe is measured by the inlet pressure sensor 52 and the outlet pressure sensor 54 under three pressure levels (5MPa, 10MPa and 15MPa), wherein the steady-state pulsation amplitude of the inlet is 6.7bar at the pressure level of 5MPa, the pressure pulsation amplitude is reduced to 5.4bar after being transmitted by the straight pipe, and the pressure pulsation amplitude reduction is 1.3 bar. The steady state pulsation amplitude of the inlet at the pressure level of 10MPa is 8.5Bar, the pressure pulsation amplitude is reduced to 6.9Bar after being transmitted by the straight pipe, and the pressure pulsation amplitude reduction amount is 1.6 Bar. The steady state pulsation amplitude of the inlet at the pressure level of 10MPa is 9.9Bar, the pressure pulsation amplitude is reduced to 7.1Bar after being transmitted by the straight pipe, and the pressure pulsation amplitude reduction amount is 2.8 Bar. It can be seen that as the pressure level increases, the magnitude and magnitude of the pressure pulsations increase.
The pressure and the pressure pulsation transmission characteristics of the typical pipeline structure in a steady state, a slow valve closing state and a fast valve closing state can be obtained. It can be seen that during the closing process, the pressure of the system drops rapidly from the operating pressure (almost zero, related to the opening of the closing valve). When the valve is opened, the pressure rises from zero to working pressure. The valve is opened and closed instantly, and a small water hammer effect appears. It can be seen that the fast closing valve has a lower minimum pressure amplitude than the slow closing valve; when the valve is opened quickly and working pressure is reached, a remarkable pressure shock peak exists, but when the valve is closed slowly, the phenomenon does not exist. Therefore, the test apparatus can monitor the valve opening time and the pressure water hammer increase amplitude of different levels, as shown in Table 1.
TABLE 1 quick-opening valve opening time and pressure water hammer growth amplitude under different pressures
| Pressure level/Mpa | Valve opening time/s | |
|
| 1 | 5 | 0.43 | 2.7 |
| 2 | 10 | 0.49 | 1.4 |
| 3 | 15 | 0.45 | 0.8 |
The pressure and the pressure pulsation transmission characteristics of a typical pipeline structure in a stable state, a slow valve closing state and a fast valve closing state can be obtained, the response of the No. 2 and No. 4 strain gauges at an outlet is obviously higher than that of an inlet, the load is transmitted and amplified on a straight pipe through vibration, and the axial strain amplitude of the pipeline is not obviously increased in comparison with the axial strain amplitude of the pipeline at different pressure levels;
acceleration and strain response characteristics of a typical pipeline structure in a steady state, a slow valve closing state and a fast valve closing state can be obtained, the vibration response result of the pipeline structure can be influenced by the fast and slow degree of valve closing, and the strain change of the fast valve closing is quicker. The pressure change is relatively smooth when the valve is slowly closed, the sudden change law similar to a square wave is presented when the valve is quickly closed, and the same law is presented under other two pressures. The main influence of the valve opening speed is the transient water hammer effect, and the acceleration and strain response of the pipeline structure are less influenced by flow-induced vibration caused by the valve opening speed.
In an embodiment, referring to fig. 1 to 17, a supporting rack 53 penetrates through an outer surface of the testing pipeline 51, the supporting rack 53 includes a fixed bracket 531 for supporting a pipeline connected between the testing pipeline 51 and the high-pressure oil pump 10, and a movable bracket 532 for supporting a pipeline connected between the testing pipeline 51 and the oil filter 40, a first pipe joint 533 for allowing the pipeline connected between the testing pipeline 51 and the high-pressure oil pump 10 to penetrate through is installed on a surface of one side of the fixed bracket 531, a first sliding groove 534 is installed on a housing of the fixed bracket 531, and a first scale 535 arranged on a surface of one side of the fixed bracket 531 is installed at a bottom end of the first sliding groove 534;
a first sliding block 536 is embedded in one side surface of the movable support 532, the movable support 532 is slidably connected with the first sliding groove 534 through the first sliding block 536, a second sliding groove 537 is arranged on a shell of the movable support 532, a second graduated scale 53a arranged on one side surface of the movable support 532 is arranged on one side of the second sliding groove 537, a second sliding block 538 is slidably connected in a groove body of the second sliding groove 537, and a second pipe joint 539 is installed on the shell of the second sliding block 538;
it should be noted that, in this embodiment, in order to adapt to different test pipelines 51, a first chute 534 is installed on the support rack 53, a first scale 535 is installed on one side of the first chute 534, so as to measure a distance between the fixed bracket 531 and the movable bracket 532, one end of the first chute 534 is the fixed bracket 531, a first slider 536 is installed in the first chute 534, the first slider 536 can move on the first chute 534, the movable bracket 532 is fixedly connected to the first slider 536 by a bolt, the movable bracket 532 can move along the first chute 534 together with the first slider 536, when sliding to a specified position, the distance is determined by the first scale 535, and the first slider 536 is fixed at the specified position of the first chute 534 by tightening the bolt on the first slider 536;
frame structures are designed on the fixed bracket 531 and the movable bracket 532 for fixing the pipe joints;
the fixed bracket 531 is fixed to an end of the first chute 534 and is immovable, wherein a first pipe joint 533 is installed on the fixed bracket 531, and the first pipe joint 533 is connected to a fluid input port of the test line 51;
the bottom of the movable support 532 is fixedly connected to a first sliding block 536, the movable support 532 and the first sliding block 536 can move and be fixed along a first sliding groove 534, a second sliding groove 537 is arranged on the movable support 532, a second graduated scale 53a is also arranged on one side of the second sliding groove 537, the central graduation of the second sliding groove 537 is 0 and is used for measuring the transverse offset of different tubular structures, a second sliding block 538 is arranged in the second sliding groove 537, the second sliding block 538 can move along the second sliding groove 537, when the movable support slides to a specified position, the distance is determined through the second graduated scale 53a, and the second sliding block 538 is fixed at the specified position of the second sliding groove 537 by tightening a bolt on the second sliding block 538;
the test device can give the lengths of the first sliding groove 534 and the second sliding groove 537 according to the size of an actual typical pipeline, so that the connection and fixation of different lengths and bent pipelines and accessories can be realized, and the test device has strong universality.
1-17, an experimental method of testing a test rig for line pressure pulsations and vibratory responses will also be provided according to the above embodiments, including the steps of:
firstly, connecting the output end of a test piece 50 with an oil filter 40, connecting the output end of the oil filter 40 with a pressure regulating mechanism 30, connecting the output end of the pressure regulating mechanism 30 with an oil tank 20, connecting the output end of the oil tank 20 with a high-pressure oil pump 10, and connecting the output end of the high-pressure oil pump 10 with the test piece 50 to form a loop;
step two, starting the high-pressure oil pump 10 to enable the high-pressure oil pump 10 to pump oil in the oil tank 20, and conveying the oil to sequentially pass through the test piece 50, the oil filter 40 and the pressure regulating mechanism 30 until the oil flows back to the oil tank 20;
step three, the pressure level of the oil conveyed in the step two is adjusted through a pressure adjusting mechanism 30, so that pressure pulsation under the specified pressure level is generated in the loop;
acquiring data through a data acquisition instrument 60 electrically connected with the loop to obtain the pressure pulsation transfer characteristic of the test piece 50, the flow resistance characteristic of the test piece 50, the out-plane and in-plane vibration acceleration responses of the test piece 50 under different pressure pulsations and the out-plane and in-plane vibration strain responses of the test piece 50 under different pressure pulsations;
further, in the fourth step, the data acquisition instrument 60 is electrically connected to the circuit to obtain the pressure pulsation transmission characteristic and the flow resistance characteristic of the test piece 50, and the method includes the following substeps:
firstly, connecting the inlet pressure sensor 52 and the outlet pressure sensor 54 through a data acquisition instrument 60;
secondly, obtaining a pressure fluctuation curve P1 at the inlet and a pressure fluctuation curve P2 at the outlet of the test pipeline 51 through the data acquisition instrument 60;
thirdly, analyzing and comparing the amplitude relation of the P1 and the P2 obtained by the second part to obtain the pressure pulsation transfer characteristic of the measured object, obtain the amplitude change result of pressure or pressure pulsation, and analyze the flow resistance characteristic of the measured object according to the related theory;
further, in the fourth step, the data acquisition instrument 60 is electrically connected to the loop to obtain out-of-plane and in-plane vibration acceleration responses of the test piece 50 under different pressure pulsations, and the method includes the following sub-steps:
firstly, adhering an acceleration sensor 55 on the outer surface of a test pipeline 51, wherein the adhering positions are spaced by 90 degrees along the section of the pipeline;
secondly, the acceleration sensor 55 is connected with the data acquisition instrument 60, the system is started and the test is started to obtain the out-plane and in-plane vibration acceleration responses of the tested object under different pressure pulses;
further, in the fourth step, the data acquisition instrument 60 is electrically connected with the loop to obtain out-of-plane and in-plane vibration strain responses of the test piece 50 under different pressure pulsations, and the method comprises the following substeps;
firstly, respectively sticking two strain gauges 56 along the axial direction of a pipeline at positions close to the first pipe joint 533 and the second pipe joint 5395mm, wherein two adjacent strain gauges 56 are stuck along the section of the pipeline at an interval of 90 degrees;
and secondly, connecting the system with a data acquisition instrument 60 through a lead, starting the system and starting testing to obtain out-of-plane and in-plane vibration strain responses of the tested object under different pressure pulsations.
The specific operation mode of the invention is as follows:
connecting the output end of a test piece 50 with an oil filter 40, connecting the output end of the oil filter 40 with a pressure regulating mechanism 30, connecting the output end of the pressure regulating mechanism 30 with an oil tank 20, connecting the output end of the oil tank 20 with a high-pressure oil pump 10, connecting the output end of the high-pressure oil pump 10 with the test piece 50 to form a loop, starting the high-pressure oil pump 10 so that the high-pressure oil pump 10 pumps oil in the oil tank 20, and conveying the oil to sequentially pass through the test piece 50, the oil filter 40 and the pressure regulating mechanism 30 until the oil flows back to the oil tank 20;
and adjusting the pressure level of the oil conveyed in the second step through the pressure regulating mechanism 30 to generate pressure pulsation in the circuit under a specified pressure level, and acquiring data through a data acquisition instrument 60 electrically connected with the circuit to obtain the pressure pulsation transmission characteristic of the test piece 50, the flow resistance characteristic of the test piece 50, the out-of-plane and in-plane vibration acceleration responses of the test piece 50 under different pressure pulsations and the out-of-plane and in-plane vibration strain responses of the test piece 50 under different pressure pulsations.
The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above-described embodiments, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (10)
1. The utility model provides a test device of test pipeline pressure pulsation and vibration response, its characterized in that, includes high-pressure oil pump (10), the input of high-pressure oil pump (10) is connected with oil tank (20), the input of oil tank (20) is connected with pressure regulating mechanism (30), the output of pressure regulating mechanism (30) is connected with oil filter (40), the input of oil filter (40) is connected with testpieces (50), the input of testpieces (50) is connected with the output of high-pressure oil pump (10), testpieces (50) are connected with data acquisition instrument (60) electricity.
2. The test device for testing the pressure pulsation and vibration response of the pipeline according to claim 1, wherein the test piece (50) comprises a test pipeline (51) having an input end connected with the high-pressure oil pump (10) through a pipeline and an output end connected with the oil filter (40) through a pipeline, an inlet pressure sensor (52) connected to the pipeline between the high-pressure oil pump (10) and the test pipeline (51), and an outlet pressure sensor (54) connected to the pipeline connected between the test pipeline (51) and the oil filter (40).
3. A test unit for testing pressure pulsations and vibrational responses of pipelines according to claim 1, characterized in that the test piece (50) further comprises an acceleration sensor (55) mounted on the outer surface of the test pipeline (51) and a strain gauge (56) mounted on the outer surface of the test pipeline (51).
4. The test device for testing pressure pulsation and vibration response of a pipeline according to claim 2, characterized in that a supporting rack (53) penetrates through the outer surface of the testing pipeline (51), the support bench (53) comprises a fixed bracket (531) for supporting a pipeline connected between the test pipeline (51) and the high-pressure oil pump (10), and a movable bracket (532) for supporting the pipe connected between the test pipe (51) and the oil filter (40), a first pipe joint (533) for inserting a pipeline for supporting the connection between the test pipeline (51) and the high-pressure oil pump (10) is arranged on the surface of one side of the fixed support (531), be equipped with first spout (534) on the casing of fixed bolster (531), the bottom of first spout (534) is equipped with locates first scale (535) of fixed bolster (531) one side surface.
5. The test device for testing the pressure pulsation and the vibration response of the pipeline according to claim 4, wherein a first sliding block (536) is embedded in one side surface of the movable support (532), the movable support (532) is connected with the first sliding groove (534) in a sliding mode through the first sliding block (536), a second sliding groove (537) is formed in a shell of the movable support (532), a second graduated scale (53 a) arranged on one side surface of the movable support (532) is arranged on one side of the second sliding groove (537), a second sliding block (538) is connected in a groove body of the second sliding groove (537) in a sliding mode, and a second pipe joint (539) is installed on the shell of the second sliding block (538).
6. The test device for testing the pressure pulsation and the vibration response of the pipeline according to claim 1, wherein the pressure regulating mechanism (30) comprises a first tee joint (31) connected with the input end of the oil tank (20) through a pipeline, the input end of the first tee joint (31) is respectively connected with a pressure regulating valve (32) and a hand valve (33) through hoses, the pressure regulating valve (32) and the hand valve (33) are connected with a second tee joint (34) through pipelines, and the second tee joint (34) is connected with the input end of an oil filter (40) through a pipeline.
7. An experimental method of a test rig for testing pressure pulsations and vibrational responses of pipelines according to any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps that firstly, the output end of a test piece (50) is connected with an oil filter (40), the output end of the oil filter (40) is connected with a pressure regulating mechanism (30), the output end of the pressure regulating mechanism (30) is connected with an oil tank (20), the output end of the oil tank (20) is connected with a high-pressure oil pump (10), and the output end of the high-pressure oil pump (10) is connected with the test piece (50) to form a loop;
step two, starting the high-pressure oil pump (10) to enable the high-pressure oil pump (10) to pump oil in the oil tank (20), and conveying the oil to pass through the test piece (50), the oil filter (40) and the pressure regulating mechanism (30) in sequence until the oil flows back to the oil tank (20);
thirdly, adjusting the pressure level of the oil conveyed in the second step through a pressure adjusting mechanism (30) so as to generate pressure pulsation in the loop under the specified pressure level;
and fourthly, acquiring data through a data acquisition instrument (60) electrically connected with the loop to obtain the pressure pulsation transfer characteristic of the test piece (50), the flow resistance characteristic of the test piece (50), the out-of-plane and in-plane vibration acceleration responses of the test piece (50) under different pressure pulsations and the out-of-plane and in-plane vibration strain responses of the test piece (50) under different pressure pulsations.
8. The experimental method for testing the pipeline pressure pulsation and vibration response testing device according to claim 7, wherein in the fourth step, the data acquisition instrument (60) is electrically connected with the loop to obtain the pressure pulsation transmission characteristic and the flow resistance characteristic of the test piece (50), and the experimental method comprises the following sub-steps:
firstly, connecting an inlet pressure sensor (52) and an outlet pressure sensor (54) through a data acquisition instrument (60);
secondly, obtaining a pressure fluctuation curve P1 at the inlet and a pressure fluctuation curve P2 at the outlet of the test pipeline (51) through a data acquisition instrument (60);
and thirdly, analyzing and comparing the amplitude relation of the P1 and the P2 obtained by the second part to obtain the pressure pulsation transfer characteristic of the measured object, obtaining the amplitude change result of the pressure or the pressure pulsation, and analyzing the flow resistance characteristic of the measured object according to a related theory.
9. The experimental method for testing the pipeline pressure pulsation and vibration response test device according to claim 7, wherein in the fourth step, the data acquisition instrument (60) is electrically connected with the loop to obtain the out-of-plane and in-plane vibration acceleration responses of the test piece (50) under different pressure pulsations, and the method comprises the following sub-steps:
firstly, an acceleration sensor (55) is adhered to the outer surface of a test pipeline (51), and the adhering positions are spaced by 90 degrees along the section of the pipeline;
and secondly, connecting the acceleration sensor (55) with a data acquisition instrument (60), starting a system and starting a test to obtain out-of-plane and in-plane vibration acceleration responses of the measured object under different pressure pulses.
10. The experimental method for testing the pipeline pressure pulsation and vibration response test device according to claim 7, wherein in the fourth step, the data acquisition instrument (60) is electrically connected with the loop to obtain out-of-plane and in-plane vibration strain responses of the test piece (50) under different pressure pulsations, and the method comprises the following sub-steps;
firstly, respectively sticking two strain gauges (56) along the axial direction of a pipeline at the position which is 5mm close to a first pipe joint (533) and a second pipe joint (539), wherein two adjacent strain gauges (56) are stuck along the section of the pipeline at an interval of 90 degrees;
and secondly, connecting the system with a data acquisition instrument (60) through a lead, starting the system and starting testing to obtain out-of-plane and in-plane vibration strain responses of the tested object under different pressure pulsations.
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| CN115126739A (en) * | 2022-07-14 | 2022-09-30 | 燕山大学 | Composite type attenuation device for digital valve group pressure pulsation and test method thereof |
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| CN115126739A (en) * | 2022-07-14 | 2022-09-30 | 燕山大学 | Composite type attenuation device for digital valve group pressure pulsation and test method thereof |
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