CN114184405A - Method and system for evaluating thermal strain fatigue life of automobile radiator assembly - Google Patents
Method and system for evaluating thermal strain fatigue life of automobile radiator assembly Download PDFInfo
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- CN114184405A CN114184405A CN202111429304.6A CN202111429304A CN114184405A CN 114184405 A CN114184405 A CN 114184405A CN 202111429304 A CN202111429304 A CN 202111429304A CN 114184405 A CN114184405 A CN 114184405A
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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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 relates to an evaluation method and a system for thermal strain fatigue life of an automobile radiator assembly, wherein the method comprises the following steps: s01: counting each speed ratio of the automobile during running according to the big data; s02: inquiring the temperature ratio of different areas according to a meteorological system; s03: collecting thermal strain values of the flat radiator pipes of the automobile at different temperatures, humidity and speeds; s04: calculating the thermal strain values of the flat radiator pipes at different speeds under the same temperature condition according to the vehicle speed ratio of S01 and the thermal strain value of the flat radiator pipe of S03; s05: multiplying the temperature ratio in the S02 by the thermal strain value of the flat tube of the radiator in the S04, and carrying out weighted summation on all multiplied results to obtain a final thermal strain value S of the flat tube of the radiator; s06: and comparing the final heat strain value S of the flat tube of the radiator with the target value T. The invention can evaluate the thermal strain fatigue life of the automobile radiator assembly and can effectively ensure that the thermal strain fatigue life of the automobile radiator assembly reaches the standard.
Description
Technical Field
The invention relates to the technical field of automobile radiator assembly development, in particular to an evaluation technology of thermal strain fatigue life of an automobile radiator assembly.
Background
The automobile cooling system is one of various large systems of an automobile, comprises a high-temperature cooling system and a low-temperature cooling system, and is mainly used for cooling a heat source; the high-temperature cooling system cools the engine, and the low-temperature cooling system cools the intercooler and the turbocharger.
The cooling system mainly comprises a radiator, a cooling fan, a water pipe, a water pump, a kettle and the like, wherein the radiator is arranged at the front end of the vehicle and is opposite to the front air inlet grille, and the cooling fan is arranged behind the radiator. When a vehicle runs, airflow flows through the radiator through the opening of the front air inlet grille, and is matched with the cooling fan which rotates at a high speed behind the radiator to cool the antifreeze in the radiator, so that the temperature of the antifreeze in an engine and a supercharger is ensured to be within a specified range, and the situation that the engine of the vehicle is overheated due to high temperature of the antifreeze is avoided, so that the working process of the engine is deteriorated, the engine oil is deteriorated, the abrasion of parts is aggravated, and finally the dynamic performance, the reliability and the durability of the engine are comprehensively reduced.
As shown in fig. 1 and 2, since the radiator assembly cools the engine, when the temperature of the engine water is high, the thermostat is fully opened, and the antifreeze solution circulation path is: the antifreeze enters the engine after being pressurized by the water pump, absorbs heat from the periphery of the water jacket wall of the engine to raise the temperature, then flows into the radiator through the water inlet pipe of the radiator to dissipate heat, so that the temperature of the antifreeze is reduced, and finally flows out of the water outlet pipe of the radiator to return to the water pump, and the cycle is repeated; when the water temperature of the engine is low, the thermostat is closed, the antifreeze enters the water jacket of the engine after being pressurized by the water pump, flows through the small circulating water pipe and then returns to the water pump, and does not pass through the radiator.
The temperature of the anti-freezing liquid flowing into the radiator is frequently changed due to frequent opening and closing of the engine thermostat, and when the anti-freezing liquid with frequently changed temperature flows into the radiator, the flat pipe generates thermal strain due to frequent temperature change of the anti-freezing liquid, so that the flat pipe of the radiator generates cracks, and finally the radiator is leaked. At present, no scientific method for evaluating the thermal strain fatigue life of the radiator assembly is available in the product development stage, so how to evaluate the thermal strain fatigue life of the radiator assembly in the product development stage is an important subject for research and development personnel.
Disclosure of Invention
The invention aims to provide a method and a system for evaluating the thermal strain fatigue life of an automobile radiator assembly, which solve the technical problems that: at present, no scientific method is available for evaluating the thermal strain fatigue life of the automobile radiator assembly so as to ensure that the thermal strain fatigue life of the automobile radiator assembly reaches the design requirement.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for evaluating the thermal strain fatigue life of an automobile radiator assembly comprises the following steps:
s01: counting each speed ratio of the automobile during running according to the big data;
s02: inquiring the temperature ratio of different areas according to a meteorological system;
s03: collecting thermal strain values of the flat radiator pipe of the automobile at different temperatures, humidity and speeds;
s04: calculating the thermal strain values of the flat radiator pipes at different speeds under the same temperature condition according to the vehicle speed ratio of S01 and the thermal strain value of the flat radiator pipe of S03;
s05: multiplying the temperature ratio in the S02 by the radiator flat tube thermal strain value in the S04, and performing weighted summation on all multiplication results to obtain a final radiator flat tube thermal strain value S;
s06: comparing the final heat strain value S of the flat tube of the radiator with a target value T, and if S is larger than or equal to T, evaluating the thermal strain fatigue life of the automobile radiator assembly as qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
Preferably, the first and second electrodes are formed of a metal,
in S01 and S02, every ten kilometers is taken as a vehicle speed interval, and every ten degrees celsius is taken as a temperature interval.
Preferably, the first and second electrodes are formed of a metal,
in the S03, eight sets of temperatures and humidities are preset, including:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
Preferably, the first and second electrodes are formed of a metal,
in S06, the target value T is a thermal strain value of the flat tube radiator estimated from a design life of the radiator.
The invention also provides an evaluation system for the thermal strain fatigue life of the automobile radiator assembly, which comprises the following steps:
a statistic module: the system is used for counting the ratio of each vehicle speed when the vehicle runs according to the big data;
the query module: the system is used for inquiring the temperature ratio of different areas according to the meteorological system;
an acquisition module: the system is used for acquiring thermal strain values of the flat radiator pipe of the automobile at different temperatures, humidity and speeds;
a first calculation module: the system comprises a statistical module, a heat collecting module and a control module, wherein the statistical module is used for calculating the heat strain value of the flat radiator pipe of the heat collecting module according to the vehicle speed ratio of the statistical module and the heat strain value of the flat radiator pipe of the collecting module to obtain the heat strain values of the flat radiator pipe of different vehicle speeds under the same temperature condition;
a second calculation module: the system comprises a query module, a first calculation module, a second calculation module and a control module, wherein the query module is used for multiplying the temperature ratio in the query module by the heat strain value of the flat tube of the radiator in the first calculation module, and performing weighted summation on all the multiplication results to obtain a final heat strain value S of the flat tube of the radiator;
a comparison module: the method is used for comparing the final heat radiator flat tube thermal strain value S with a target value T, and if S is larger than or equal to T, the thermal strain fatigue life of the automobile heat radiator assembly is evaluated to be qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
Preferably, the first and second electrodes are formed of a metal,
in the statistical module and the query module, every ten kilometers are taken as a vehicle speed interval, and every ten degrees centigrade is taken as a temperature interval.
Preferably, the first and second electrodes are formed of a metal,
in the collection module, eight groups of preset temperatures and humidities include:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
Preferably, the first and second electrodes are formed of a metal,
in the comparison module, the target value T is a thermal strain value of the flat tube of the radiator calculated according to the design life of the radiator.
By adopting the technical scheme, the invention has the following beneficial technical effects: the method is used for testing the heat radiator assembly on the whole vehicle under the conditions of different temperatures and different vehicle speeds, and evaluating the thermal strain fatigue life of the automobile heat radiator assembly by integrating the actual use conditions of the vehicle owner, so that the thermal strain fatigue life of the automobile heat radiator assembly can be effectively ensured to reach the standard.
Drawings
FIG. 1 is a circulation path of an antifreeze solution in the background art when the temperature of engine water is high;
FIG. 2 is a view showing a circulation path of an antifreeze solution in the background art when the temperature of the engine water is low;
FIG. 3 is a flow chart of the calculation of the final heat sink flat tube thermal strain value according to the present invention;
FIG. 4 is a table of temperature and humidity for the environmental chamber of the present invention;
FIG. 5 is a schematic view of the top and bottom corners and the positions of water inlet and outlet ports of the heat sink;
fig. 6 is a schematic diagram of the position of the thermal strain gauge patch of the heat sink of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 3, the present invention provides a method for evaluating thermal strain fatigue life of an automobile radiator assembly, which can directly calculate a thermal strain value of a flat tube of a radiator, so as to evaluate whether the thermal strain fatigue life of the automobile radiator assembly reaches the standard.
The method comprises the following steps: s01: counting each speed ratio of the automobile during running according to the big data;
s02: inquiring the temperature ratio of different areas according to a meteorological system;
s03: collecting thermal strain values of the flat radiator pipes of the automobile at different temperatures, humidity and speeds;
s04: calculating the thermal strain values of the flat radiator pipes at different speeds under the same temperature condition according to the vehicle speed ratio of S01 and the thermal strain value of the flat radiator pipe of S03;
s05: multiplying the temperature ratio in the S02 by the thermal strain value of the flat tube of the radiator in the S04, and carrying out weighted summation on all multiplied results to obtain a final thermal strain value S of the flat tube of the radiator;
s06: comparing the final heat strain value S of the flat tube of the radiator with a target value T, and if S is larger than or equal to T, evaluating the thermal strain fatigue life of the automobile radiator assembly as qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
In this embodiment, as shown in fig. 5 and 6, before the above steps are performed, a radiator assembly sample to be tested should be prepared, a thermal strain gauge is arranged at the root of a flat pipe of a radiator, where a mark a indicates a vertex angle of the radiator, a mark B indicates a water inlet position of the radiator, a mark C indicates a water outlet position of the radiator, a mark D indicates a bottom angle of the radiator, and a mark E indicates a patch position of the strain gauge; and (4) replacing the radiator assembly of the arranged thermal strain gauge on the test vehicle, and connecting the radiator assembly with data acquisition equipment.
Specifically, in S01 and S02, one vehicle speed interval is every ten kilometers, and one temperature interval is every ten degrees celsius.
Specifically, as shown in fig. 4, the temperature and humidity of the environmental chamber are changed, that is, in S03, eight sets of temperature and humidity are preset, including:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
Specifically, in S06, the target value T is a radiator flat tube thermal strain value estimated from the radiator design life.
The invention also provides an evaluation system for the thermal strain fatigue life of the automobile radiator assembly, which comprises the following steps:
a statistic module: the system is used for counting the ratio of each vehicle speed when the vehicle runs according to the big data;
the query module: the system is used for inquiring the temperature ratio of different areas according to the meteorological system;
an acquisition module: the device is used for collecting thermal strain values of the flat radiator pipe of the automobile at different temperatures, humidity and speeds;
a first calculation module: the system comprises a statistical module, a collecting module, a temperature sensor and a control module, wherein the statistical module is used for calculating the thermal strain value of the flat radiator pipe of the collecting module according to the vehicle speed ratio of the statistical module and the thermal strain value of the flat radiator pipe of the collecting module to obtain the thermal strain value of the flat radiator pipe of different vehicle speeds under the same temperature condition;
a second calculation module: the device comprises a query module, a first calculation module, a second calculation module and a control module, wherein the query module is used for multiplying the temperature ratio in the query module by the thermal strain value of the flat tube of the radiator in the first calculation module, and performing weighted summation on all multiplied results to obtain a final thermal strain value S of the flat tube of the radiator;
a comparison module: the method is used for comparing the final heat radiator flat tube thermal strain value S with a target value T, and if S is larger than or equal to T, the thermal strain fatigue life of the automobile heat radiator assembly is evaluated to be qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
In particular, the amount of the solvent to be used,
in the statistical module and the query module, every ten kilometers are taken as a vehicle speed interval, and every ten degrees centigrade is taken as a temperature interval.
In particular, the amount of the solvent to be used,
in the collection module, predetermine eight groups of temperature and humidity, include:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
In particular, the amount of the solvent to be used,
in the comparison module, the target value T is a thermal strain value of the flat tube of the radiator calculated according to the design life of the radiator.
Claims (8)
1. A method for evaluating the thermal strain fatigue life of an automobile radiator assembly is characterized by comprising the following steps:
s01: counting each speed ratio of the automobile during running according to the big data;
s02: inquiring the temperature ratio of different areas according to a meteorological system;
s03: collecting thermal strain values of the flat radiator pipe of the automobile at different temperatures, humidity and speeds;
s04: calculating the thermal strain values of the flat radiator pipes at different speeds under the same temperature condition according to the vehicle speed ratio of S01 and the thermal strain value of the flat radiator pipe of S03;
s05: multiplying the temperature ratio in the S02 by the radiator flat tube thermal strain value in the S04, and performing weighted summation on all multiplication results to obtain a final radiator flat tube thermal strain value S;
s06: comparing the final heat strain value S of the flat tube of the radiator with a target value T, and if S is larger than or equal to T, evaluating the thermal strain fatigue life of the automobile radiator assembly as qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
2. The method for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 1,
in S01 and S02, every ten kilometers is taken as a vehicle speed interval, and every ten degrees celsius is taken as a temperature interval.
3. The method for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 1,
in the S03, eight sets of temperatures and humidities are preset, including:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
4. The method for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 1,
in S06, the target value T is a thermal strain value of the flat tube radiator estimated from a design life of the radiator.
5. An evaluation system for thermal strain fatigue life of an automotive radiator assembly, comprising:
a statistic module: the system is used for counting the ratio of each vehicle speed when the vehicle runs according to the big data;
the query module: the system is used for inquiring the temperature ratio of different areas according to the meteorological system;
an acquisition module: the system is used for acquiring thermal strain values of the flat radiator pipe of the automobile at different temperatures, humidity and speeds;
a first calculation module: the system comprises a statistical module, a heat collecting module and a control module, wherein the statistical module is used for calculating the heat strain value of the flat radiator pipe of the heat collecting module according to the vehicle speed ratio of the statistical module and the heat strain value of the flat radiator pipe of the collecting module to obtain the heat strain values of the flat radiator pipe of different vehicle speeds under the same temperature condition;
a second calculation module: the system comprises a query module, a first calculation module, a second calculation module and a control module, wherein the query module is used for multiplying the temperature ratio in the query module by the heat strain value of the flat tube of the radiator in the first calculation module, and performing weighted summation on all the multiplication results to obtain a final heat strain value S of the flat tube of the radiator;
a comparison module: the method is used for comparing the final heat radiator flat tube thermal strain value S with a target value T, and if S is larger than or equal to T, the thermal strain fatigue life of the automobile heat radiator assembly is evaluated to be qualified; and if S is less than T, evaluating the thermal strain fatigue life of the automobile radiator assembly as unqualified.
6. The system for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 5,
in the statistical module and the query module, every ten kilometers are taken as a vehicle speed interval, and every ten degrees centigrade is taken as a temperature interval.
7. The system for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 5,
in the collection module, eight groups of preset temperatures and humidities include:
first group, temperature: -30 ℃; humidity: 0 RH;
second group, temperature: -20 ℃; humidity: 0 RH;
third group, temperature: -10 ℃; humidity: 0 RH;
fourth group, temperature: 0 ℃; humidity: 0 RH;
fifth group, temperature: 10 ℃; humidity: 50% RH;
sixth group, temperature: 20 ℃; humidity: 50% RH;
group seven, temperature: 30 ℃; humidity: 50% RH;
group eight, humidity: 40 ℃; humidity: 50% RH.
8. The system for evaluating thermal strain fatigue life of an automobile radiator assembly according to claim 5,
in the comparison module, the target value T is a thermal strain value of the flat tube of the radiator calculated according to the design life of the radiator.
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