CN112629789B - Fuel tank vibration durability test device and method - Google Patents
Fuel tank vibration durability test device and method Download PDFInfo
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- CN112629789B CN112629789B CN202011491611.2A CN202011491611A CN112629789B CN 112629789 B CN112629789 B CN 112629789B CN 202011491611 A CN202011491611 A CN 202011491611A CN 112629789 B CN112629789 B CN 112629789B
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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
- G01M7/02—Vibration-testing by means of a shake table
-
- 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
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
-
- 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
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a fuel tank vibration durability test device which is characterized by comprising a vibration test bed, an oil inlet and return device, a dynamic strain acquisition instrument and a data processor, wherein the oil inlet and return device is arranged at the upper part of the vibration test bed; the oil inlet and return device comprises a first test oil tank and a second test oil tank, and the first test oil tank is connected with the second test oil tank through a bidirectional variable pump; the bidirectional variable pump is provided with a controller; the dynamic strain acquisition instrument is connected with the first test oil tank and the second test oil tank, and the data processor is connected with the dynamic strain acquisition instrument; according to the invention, two oil tanks vibrate simultaneously, so that batch tests of the same batch of oil tanks can be performed while the oil storage tanks are reduced, the test conditions of tested pieces are consistent, and the efficiency of sampling test of the same batch of oil tanks is improved.
Description
Technical Field
The invention relates to a fuel tank vibration durability test device and method, and belongs to the technical field of excavators.
Background
The fuel tank is a key component of the excavator power system, the performance of the fuel tank comprises the structural strength, the service life and the like of the tank body, the normal operation of the excavator can be directly influenced, and the fuel tank is easy to form vibration fatigue damage under the combined action of the fuel tank, the oil-liquid coupling and the vibration load of the operation working condition, so that the fuel tank is necessary to be subjected to a fluid-solid coupling vibration durability test in the design stage so as to ensure the sufficient safety and the service life of the fuel tank.
The oil liquid level depth of the oil tank has an influence on the vibration mode of the oil tank, the mutual coupling action of the oil in the oil tank of the oven and the structure, and the vibration frequency of the oil tank is greatly reduced compared with the frequency of a mechanism of the oil tank only in consideration, so that the influence of the oil in the oil tank on the oil tank cannot be ignored when the research on the vibration durability of the oil tank is carried out.
The fuel tank has the advantages that due to the fluid-solid coupling effect of the oil in the tank body, the structural dynamics characteristics of the fuel tank are changed, the liquid level of the oil in the tank body is different, and the mode and the vibration durability of the fuel tank are also different. The liquid level in the oil tank is continuously changed in the working process, so that the mode and vibration durability of the oil tank are also continuously changed. According to the test method, only the liquid loading amount of 1/2 rated capacity is used for carrying out the vibration durability test on the tank body, but the vibration durability test is not carried out on the tank bodies with other liquid levels, the test method is not completely matched with the actual working condition of the excavator, and the obtained vibration durability test result of the fuel tank and the result in the actual working state have errors, so that the vibration durability performance of the fuel tank cannot be accurately predicted.
Disclosure of Invention
The invention aims to provide a fuel tank vibration durability test device and method, which are used for solving the problem that the vibration durability test result of the fuel tank in the prior art and the result in the actual working state have errors and cannot accurately predict the vibration durability defect of the fuel tank.
The fuel tank vibration durability test device comprises a vibration test bed, a fuel inlet and return device, a dynamic strain acquisition instrument and a data processor;
the oil inlet and return device is arranged at the upper part of the vibration test bed;
the oil inlet and return device comprises a first test oil tank and a second test oil tank, and the first test oil tank is connected with the second test oil tank through a bidirectional variable pump;
the bidirectional variable pump is provided with a controller;
the dynamic strain acquisition instrument is connected with the first test oil tank and the second test oil tank, and the data processor is connected with the dynamic strain acquisition instrument.
Further, the first test oil tank and the second test oil tank are respectively provided with a first liquid level sensor and a second liquid level sensor.
Further, the first test oil tank and the second test oil tank are respectively provided with a first strain gauge and a second strain gauge, and the first strain gauge and the second strain gauge are arranged in a structure detection area of the first test oil tank and the second test oil tank.
Further, the oil inlet and return device is fixedly arranged on the upper portion of the vibration test bed through the mounting tool.
A method of testing vibration durability of a fuel tank, the method comprising the steps of:
simulating the dynamic state of the oil inlet and return device under the working condition;
the dynamic strain acquisition instrument converts the signals acquired by the strain gauge into strain numerical values and sends the strain numerical values to the data processor;
the data processor calculates a fatigue damage value from the obtained strain value;
comparing the fatigue damage value with a numerical value preset in the controller, and if the fatigue damage value is more than or equal to 1 or a crack fault occurs at a measuring point, failing to meet the design requirement on the vibration durability of the fuel tank structure; if the fatigue damage value is less than 1 and no cracking fault occurs, the structure vibration durability of the fuel tank is proved to meet the design requirement.
Further, the method for calculating the fatigue damage value comprises the following steps:
preprocessing the time domain strain signals of the measuring points to obtain time domain stress signals;
calculating the equivalent stress of von Mises in a random process through the time domain stress signal, and obtaining the stress power spectrum density through the equivalent stress; and obtaining a stress distribution function through the stress power spectrum density, and calculating a fatigue damage value through the stress distribution function and the material S-N curve.
Further, the simulation method includes:
filling one of the oil tanks to be tested with oil, and starting a bidirectional variable pump and a vibration test bed without filling the other oil tank to be tested with oil;
when the liquid level sensor detects that the liquid level of the oil in the test oil tank reaches a set position, the controller controls the rotation direction of the bidirectional variable pump to suck the oil from the oil tank to be tested to another oil tank to be tested, and the steps are repeated continuously and circularly.
Compared with the prior art, the invention has the beneficial effects that:
(1) Because the vibration load spectrum of the oil tank and the change of the oil quantity of the oil tank are collected on the basis of a user working condition and a real vehicle, the test load working condition is the working condition of the actual operation of the excavator, and compared with the prior technical scheme, the test result has referential property and authority.
(2) The two oil tanks are simultaneously vibrated, so that batch tests of the same batch of oil tanks can be performed while the oil storage tanks are reduced, the test conditions of the tested pieces are consistent, and the efficiency of the sampling test of the same batch of oil tanks is improved;
(3) Likewise, the oil tank 101 and the oil tank 102 can be oil tanks before and after structural optimization or two products subjected to comparison analysis, so that the performance conditions of the oil tanks before and after optimization or the performance advantages and disadvantages of two different products can be absolutely and objectively compared and verified through simultaneous experiments.
Drawings
FIG. 1 is an overall view of an inventive test fixture;
FIG. 2 is a schematic diagram of the structure of the test fixture of the present invention;
FIG. 3 is a flow chart of an experiment of the present invention.
In the figure: 100. an oil inlet and return device; 101. Testing a first oil tank; 102. testing a second oil tank; 103. a first liquid level sensor; 104. a liquid level sensor II; 105. a bidirectional variable pump; 106. a controller; 107. strain gage I; 108. strain gage II; 109. a dynamic strain acquisition instrument; 110. a data processor; 200. installing a tool; 300. vibration test bed.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1-2, a fuel tank vibration durability test apparatus is disclosed 1, which is characterized by comprising a vibration test stand 300, an oil intake and return device 100, a dynamic strain gauge 109 and a data processor 110;
the oil inlet and return device 100 is arranged at the upper part of the vibration test stand 300;
the oil inlet and return device 100 comprises a first test oil tank 101 and a second test oil tank 102, and the first test oil tank 101 and the second test oil tank 102 are connected through a bidirectional variable pump 105;
the bidirectional variable pump 105 is provided with a controller 106;
the dynamic strain acquisition instrument 109 is connected with the first test oil tank 101 and the second test oil tank 102, and the data processor 110 is connected with the dynamic strain acquisition instrument 109.
The first test oil tank 101 and the second test oil tank 102 are respectively provided with a first liquid level sensor 103 and a second liquid level sensor 104.
The first test oil tank 101 and the second test oil tank 102 are respectively provided with a first strain gauge 107 and a second strain gauge 108, and the first strain gauge 107 and the second strain gauge 108 are arranged in structural detection areas of the first test oil tank 101 and the second test oil tank 102; the method is particularly applicable to heavy point attention areas such as cracking areas, structure change areas and the like which are easy to occur in the actual working of working conditions.
The oil inlet and return device 100 is fixedly arranged on the upper part of the vibration test stand 300 through the mounting tool 200.
As shown in fig. 3, a method for testing the vibration durability of a fuel tank is also disclosed, which comprises the following steps:
the oil inlet and return device 100 of the oil tank realizes continuous circulation oil pumping and oil return of the two test oil tanks 101 and 102 through corresponding control and execution elements, so as to simulate the change condition of the liquid level in the oil tank under the use condition of a user; during operation of the oil inlet and return device 100, the two test oil tanks 101 and 102 in the oil inlet and return device 100 are connected with the vibration test stand 300 through the mounting tool 200, and a vibration endurance test is performed.
(1) Before the test starts, the oil tank 101 to be tested is filled with oil, the oil tank 102 to be tested is not filled with oil, and the oil tank is empty. The oil inlet and return port of the test oil tank 101 is connected with a bidirectional variable pump 105 through an oil pipe, and the bidirectional variable pump 105 is connected with the oil inlet and return port of the test oil tank 102.
The time-varying parameter of the fuel consumption of the fuel tank collected by the real vehicle under the working condition of the user is input into the controller 106, and the controller 106 adjusts the bidirectional variable pump 105 to the corresponding flow according to the input parameter. The oil flows out from the oil inlet/return port of the oil tank 101, and flows into the test oil tank 102 through the bidirectional variable pump 105 and the oil inlet/return port of the test oil tank 102.
(2) When the liquid level sensor 104 detects that the liquid level of the oil in the test oil tank 102 reaches the set position, the controller 106 controls the rotation direction of the bidirectional variable pump 105, sucks the oil from the oil inlet and return port of the oil tank 102, and flows into the test oil tank 101 through the bidirectional variable pump 105 and the oil inlet and return port of the oil tank 101.
(3) When the liquid level sensor 103 detects that the liquid level of the oil in the test oil tank 101 reaches the set position, the steps (1) and (2) are repeated, so that continuous circulation oil pumping and oil return of the two test oil tanks 101 and 102 are realized.
(4) And (3) carrying out vibration tests on the test oil tanks 101 and 102 on a vibration test bed while continuously circulating oil pumping and oil returning in the steps (1), (2) and (3), wherein the input load adopts a PSD load spectrum synthesized according to the use condition of a user. And simulating the actual working condition of a user. The form of the vibration load spectrum is selected according to the type of the vibration test bed, if a three-way single-shaft vibration test bed is adopted, PSD load spectrums in three directions are adopted for vibration test respectively; if a six-degree-of-freedom vibration test bed is adopted, a six-degree-of-freedom vibration test PSD load spectrum is adopted.
(5) The strain gauge 107 and the strain gauge 108 are respectively attached to the heavy point attention analysis areas such as the past fault cracking areas and the past oil tank structure change areas of the test oil tanks 101 and 102 in advance before the test is performed. For convenience of comparison data, the strain gauges 107 and 108 on the two test oil tanks should be in one-to-one correspondence.
(6) In the vibration test process, the test oil tank 101 outputs structural strain of the test position through the strain gauge 107 and the test oil tank 102 through the strain gauge 108, and the structural strain of the test position is read out through the dynamic strain acquisition instrument 109.
(7) Based on the structural strain read by the dynamic strain gauge 109, the fatigue damage value D at the time t of each test point is calculated by the data processor 110 according to the calculation flow of fig. 3.
(8) Judging the test result according to the calculated fatigue damage value D:
(a) In the specified test time, if the fatigue damage value D of the measuring point is more than or equal to 1 or the cracking fault occurs at the measuring point, the vibration durability of the fuel tank structure is proved to be not met with the design requirement, the test analysis reason is stopped, and the structure is optimized and improved;
(b) In the specified test time, if the fatigue damage value D of the test point is less than 1 and no cracking fault occurs, the vibration durability of the fuel tank structure is proved to meet the design requirement;
(c) For the comparison analysis of the oil tanks before and after the optimization of the test oil tank 101 and the test oil tank 102, the smaller the fatigue damage value D of the measurement points at the same position of the two oil tanks is in a specified time, the stronger the vibration durability of the oil tank structure is.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (6)
1. The fuel tank vibration durability test device is characterized by comprising a vibration test bed (300), an oil inlet and return device (100), a dynamic strain acquisition instrument (109) and a data processor (110);
the oil inlet and return device (100) is arranged at the upper part of the vibration test stand (300);
the oil inlet and return device (100) comprises a first test oil tank (101) and a second test oil tank (102), and the first test oil tank (101) and the second test oil tank (102) are connected through a bidirectional variable pump (105);
the bidirectional variable pump (105) is provided with a controller (106);
the dynamic strain acquisition instrument (109) is connected with the first test oil tank (101) and the second test oil tank (102), and the data processor (110) is connected with the dynamic strain acquisition instrument (109);
the first test oil tank (101) and the second test oil tank (102) are respectively provided with a first strain gauge (107) and a second strain gauge (108), and the first strain gauge (107) and the second strain gauge (108) are arranged in structural detection areas of the first test oil tank (101) and the second test oil tank (102);
when the test is carried out, filling oil into one of the oil tanks to be tested, and starting the bidirectional variable pump and the vibration test bed without filling oil into the other oil tank to be tested; when the liquid level sensor detects that the liquid level of the oil in the test oil tank reaches a set position, the controller controls the rotation direction of the bidirectional variable pump to suck the oil from the oil tank to be tested to another oil tank to be tested, and the steps are repeated continuously and circularly.
2. The fuel tank vibration durability test apparatus according to claim 1, wherein the first test tank (101) and the second test tank (102) are provided with a first liquid level sensor (103) and a second liquid level sensor (104), respectively.
3. The fuel tank vibration durability test apparatus according to claim 1, wherein the oil inlet and return apparatus (100) is fixedly provided on an upper portion of the vibration test stand (300) through a mounting tool (200).
4. A test method using the fuel tank vibration durability test apparatus according to any one of claims 1 to 3, characterized by comprising the steps of:
simulating the dynamic state of the oil inlet and return device under the working condition;
the dynamic strain acquisition instrument converts the signals acquired by the strain gauge into strain numerical values and sends the strain numerical values to the data processor;
the data processor calculates a fatigue damage value from the obtained strain value;
comparing the fatigue damage value with a numerical value preset in the controller, and if the fatigue damage value is more than or equal to 1 or a crack fault occurs at a measuring point, failing to meet the design requirement on the vibration durability of the fuel tank structure; if the fatigue damage value is less than 1 and no cracking fault occurs, the structure vibration durability of the fuel tank is proved to meet the design requirement.
5. The test method according to claim 4, wherein the method for calculating the fatigue damage value comprises:
preprocessing the time domain strain signals of the measuring points to obtain time domain stress signals;
calculating the equivalent stress of von Mises in a random process through the time domain stress signal, and obtaining the stress power spectrum density through the equivalent stress; and obtaining a stress distribution function through the stress power spectrum density, and calculating a fatigue damage value through the stress distribution function and the material S-N curve.
6. The assay method of claim 4, wherein the method comprises:
filling one of the oil tanks to be tested with oil, and starting a bidirectional variable pump and a vibration test bed without filling the other oil tank to be tested with oil;
when the liquid level sensor detects that the liquid level of the oil in the test oil tank reaches a set position, the controller controls the rotation direction of the bidirectional variable pump to suck the oil from the oil tank to be tested to another oil tank to be tested, and the steps are repeated continuously and circularly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011491611.2A CN112629789B (en) | 2020-12-17 | 2020-12-17 | Fuel tank vibration durability test device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011491611.2A CN112629789B (en) | 2020-12-17 | 2020-12-17 | Fuel tank vibration durability test device and method |
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| CN112629789A CN112629789A (en) | 2021-04-09 |
| CN112629789B true CN112629789B (en) | 2023-09-12 |
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