Contact and non-contact combined temperature rise data test method

Abstract

The invention discloses a contact and non-contact combined temperature rise data testing method, which relates to the field of temperature testing, and is characterized in that a contact temperature measurement result is corrected by using a temperature rise rate in non-contact temperature measurement according to contact and non-contact temperature measurement characteristics, and a non-contact temperature measurement result is corrected by using temperature rise data obtained by the contact temperature measurement. The influence of the thermal resistance between the test sensor and the tested object on the contact temperature measurement response rate and the influence of the test distance, the surface thermal emissivity of the tested object, smoke dust and the like on the non-contact temperature measurement precision are reduced, and a high-response accurate temperature test result is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of temperature testing, and in particular to a contact and non-contact combined temperature rise testing data method. Background Art

[0002] In the process of scientific research, temperature, as a physical parameter, can reflect the law of energy conversion and needs to be measured accurately. For example, during the brake friction process, most of the braking energy is converted into heat, which increases the temperature of the brake friction components. In order to study the law of energy conversion during braking, high-precision measurement of brake temperature is crucial.

[0003] Temperature testing can be divided into contact temperature testing and non-contact temperature testing. Contact temperature testing measures the temperature of the object being tested by directly contacting the sensor with the object being tested for heat exchange. Sensors such as thermocouples and thermal resistors are used. Non-contact temperature testing performs temperature testing by receiving infrared radiation emitted by the object being tested. In contact temperature testing, there is thermal resistance between the sensor and the object being tested. The sensor needs to exchange heat with the object being tested, resulting in a time lag in the temperature test results. However, due to the small size and heat capacity of the sensor probe structure, the temperature rise measurement is more accurate for measurements with higher temperature rise. Since the propagation speed of infrared radiation emitted by the object being tested is the same as the speed of light, the non-contact temperature test results can reflect the real-time changes in the temperature of the test piece. However, the intensity of infrared radiation emitted by the object being tested will be affected by environmental factors such as the surface emissivity of the object being tested, the test distance, and smoke, resulting in low numerical accuracy of the temperature test. It is often used to conduct qualitative research on the temperature of rotating parts of the object being tested.

[0004] For high-response and high-precision temperature measurement tasks with fast temperature rise of the measured object, it is necessary to ensure the accuracy of the temperature rise value and avoid the delay of temperature measurement in the time domain. It is difficult to meet the requirements by relying solely on contact temperature testing or non-contact temperature testing. For this reason, it is necessary to use the characteristics of the above two temperature tests to correct the temperature test results to improve the accuracy of temperature testing. Summary of the invention

[0005] In view of this, the present invention provides a contact and non-contact combined temperature rise data testing method, which can realize the control of the driving system and the cooling system according to the off-road working conditions and the cooling system signal.

[0006] A contact and non-contact combined temperature rise data testing method comprises the following steps:

[0007] Step 1. Install a contact temperature measuring tool on the outer surface of the brake static friction pad, set up a non-contact temperature measuring tool on the side of the brake, and measure the temperature of the outer surface of the brake static friction pad;

[0008] Step 2. After the brake enters the braking state, the control system extracts the temperature rise time and the temperature measurement time measured by the contact temperature measuring tool, and the control system controls the non-contact temperature measuring tool to collect the thermal imaging temperature rise time, and corrects the corresponding time of the temperature data collected by the contact temperature measuring tool according to the thermal imaging temperature rise time collected by the non-contact temperature measuring tool;

[0009] Step 3. The control system extracts the thermal imaging temperature rise, temperature measurement temperature and initial temperature value collected by the non-contact temperature measurement tool, the control system controls the contact temperature measurement tool to collect the initial contact temperature measurement temperature value, and the control system corrects the temperature data obtained by the non-contact temperature measurement tool based on the above data.

[0010] Furthermore, the non-contact temperature measuring tool measures the temperature on the outer circumferential surface of the static friction plate, which is in the same axial position as the measuring point of the contact temperature measuring tool on the static friction plate, and the temperature rise of the two points is consistent.

[0011] Furthermore, the step 2 specifically includes the following contents:

[0012] According to the thermal imaging data, the time corresponding to the temperature data collected by the contact temperature measurement tool is corrected. The specific calculation formula is as follows:

[0013]

[0014] t' K =t K ·k t

[0015] Among them, k t is the temperature measurement time correction coefficient, Δt K is the temperature rise time of the contact temperature measurement tool, Δt L Collect thermal imaging temperature rise time for non-contact temperature measurement tools, t K is the temperature measurement time of the contact temperature measurement tool, t' K Correct the time corresponding to the temperature data collected by the contact temperature measurement tool for thermal imaging data.

[0016] Furthermore, the step 3 specifically includes the following contents:

[0017] The control system corrects the temperature data obtained by the non-contact temperature measurement tool based on the temperature rise data measured by the contact temperature measurement tool. The specific calculation formula is as follows:

[0018]

[0019] T' L =(T L -T L0 )·k T +T K0

[0020] Among them, k T is the temperature correction coefficient of the temperature measurement, ΔT K The temperature rise measured by the contact temperature measurement tool, ΔT L Collect thermal imaging temperature rise for non-contact temperature measurement tools, T L The temperature measured by the non-contact temperature measurement tool, T L0 is the initial value of non-contact temperature measurement, T K0 is the initial value of contact temperature measurement, T' L The control system uses the temperature rise data obtained by contact measurement to correct the non-contact temperature measurement data.

[0021] Furthermore, the Δt L and Δt K , Δt L The value range is 0-6s, Δt K The value range is 0-12s.

[0022] Furthermore, the contact temperature measurement tool and the non-contact temperature measurement tool, wherein the contact temperature measurement tool includes: a thermocouple and a thermal resistor, and the non-contact temperature measurement tool includes: an infrared radiation thermometer and a colorimetric thermometer.

[0023] Beneficial effects:

[0024] 1. The present invention proposes a contact and non-contact combined temperature rise data testing method, which obtains the final corrected temperature rise data by cooperating with a thermocouple, a contact temperature rise data measuring device, and a thermal imaging instrument, a non-contact temperature rise data measuring device, which can effectively combine the test advantages of the two test devices, effectively avoid the defects of a single test method, and ensure the accuracy of data testing;

[0025] 2. This method corrects the time corresponding to the temperature data collected by the thermocouple according to the thermal imaging data. Because there is thermal resistance between the contact sensor such as the thermocouple and the object being measured, the sensor needs to exchange heat with the object being measured, resulting in a time lag in the temperature test result. The non-contact sensor measures by emitting infrared radiation to the object being measured, and the propagation speed of infrared radiation is the same as the speed of light, so the reaction time is faster. The accuracy of correcting the time parameter in this way is higher.

[0026] 3. The control system of this method corrects the temperature data of non-contact temperature measurement according to the temperature rise data obtained by thermocouple measurement. The sensor used in the contact temperature measurement method is generally small in size and heat capacity. For the measurement of higher temperature rise, the temperature rise measurement is more accurate. The infrared radiation emitted by the non-contact temperature test device is easily affected by environmental factors such as the emissivity of the surface of the object being measured, the test distance, and smoke, resulting in low accuracy of the temperature test value. Therefore, correcting the non-contact temperature test data by contact can effectively improve the accuracy;

[0027] 4. This method improves the test accuracy of temperature data by cleverly combining two test methods. It is easy to replicate, has low economic consumption, and has good promotion benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a data correction statistical chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] In view of this, the present invention provides a contact and non-contact combined temperature rise data testing method, which can realize the control of the driving system and the cooling system according to the off-road working conditions and the cooling system signal.

[0031] A contact and non-contact combined temperature rise data testing method comprises the following steps:

[0032] Step 1. Install a contact temperature measuring tool on the outer surface of the static friction plate, set up a non-contact temperature measuring tool on the side of the brake, and measure the temperature of the outer surface of the static friction plate of the brake;

[0033] The contact temperature measuring tool and the non-contact temperature measuring tool, wherein the contact temperature measuring tool includes: a thermocouple and a thermal resistor, and the non-contact temperature measuring tool includes: an infrared radiation thermometer and a colorimetric thermometer; the non-contact temperature measuring tool measures the temperature at the outer circumferential surface of the static friction plate, and is at the same axial position as the measuring point of the contact temperature measuring tool on the static friction plate, and the temperature rise of the two points is consistent;

[0034] In this embodiment, a brake test is performed on the brake using a brake test bench, a thermocouple sensor probe is attached to the outer surface of the static friction pad through a high-temperature repair agent, the temperature of the brake static friction pad is measured using a thermocouple (contact measurement), a thermal imager is set up on the side of the brake, and the temperature of the outer cylindrical surfaces of the static friction pad and the dynamic friction pad of the brake is measured using a non-contact temperature measurement method. After the brake is applied, the temperature data collected by the thermocouple is extracted, and another point with the same temperature rise as the thermocouple measuring point is selected at the same axial position on the outer cylindrical surface of the static friction pad, the thermal imaging temperature rise data of this point is extracted, and the temperature rise rate measured by the thermal imaging is used to correct the thermocouple test results.

[0035] Step 2. After the brake enters the braking state, the control system extracts the temperature data collected by the contact temperature measuring tool, controls the non-contact temperature measuring tool to collect thermal imaging temperature rise data, and corrects the time corresponding to the temperature data collected by the contact temperature measuring tool according to the thermal imaging data;

[0036] According to the thermal imaging data, the time corresponding to the temperature data collected by the contact temperature measurement tool is corrected. The specific calculation formula is as follows:

[0037]

[0038] t' K =t K ·k t

[0039] Among them, k t is the temperature measurement time correction coefficient, Δt K is the temperature rise time of the contact temperature measurement tool, Δt L Collect thermal imaging temperature rise time for non-contact temperature measurement tools, t K is the temperature measurement time of the contact temperature measurement tool, t' K Correct the time corresponding to the temperature data collected by the contact temperature measurement tool for thermal imaging data.

[0040] Step 3. The control system corrects the temperature data obtained by the non-contact temperature measuring tool according to the temperature rise data obtained by the contact temperature measuring tool.

[0041] The control system corrects the temperature data obtained by the non-contact temperature measurement tool based on the temperature rise data measured by the contact temperature measurement tool. The specific calculation formula is as follows:

[0042]

[0043] T' L =(T L -T L0 )·k T +T K0

[0044] Among them, k T is the temperature correction coefficient of the temperature measurement, ΔT K The temperature rise measured by the contact temperature measurement tool, ΔT L Collect thermal imaging temperature rise for non-contact temperature measurement tools, T L The temperature measured by the non-contact temperature measurement tool, T L0 is the initial value of non-contact temperature measurement, T K0 is the initial value of contact temperature measurement, T' L The control system uses the temperature rise data obtained by contact measurement to correct the non-contact temperature measurement data.

[0045] The Δt L and Δt K , Δt L The value range is 0-6s, Δt K The value range is 0-12s, and the curve statistics finally obtained in this embodiment are as shown in the attached Figure 1 shown.

[0046] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A contact and non-contact combined temperature rise data testing method, characterized in that: The steps include: Step 1. Install a contact temperature measuring tool on the outer surface of the brake static friction pad, set up a non-contact temperature measuring tool on the side of the brake, and measure the temperature of the outer surface of the brake static friction pad; Step 2. After the brake enters the braking state, the control system extracts the temperature rise time and the temperature measurement time measured by the contact temperature measuring tool, and the control system controls the non-contact temperature measuring tool to collect the thermal imaging temperature rise time, and corrects the corresponding time of the temperature data collected by the contact temperature measuring tool according to the thermal imaging temperature rise time collected by the non-contact temperature measuring tool; Step 3. The control system extracts the thermal imaging temperature rise, temperature measurement temperature and initial temperature value collected by the non-contact temperature measurement tool, the control system controls the contact temperature measurement tool to collect the initial contact temperature measurement temperature value, and the control system corrects the temperature data obtained by the non-contact temperature measurement tool based on the above data.

2. The method according to claim 1, characterized in that The non-contact temperature measuring tool measures the temperature on the outer circumferential surface of the static friction plate, which is in the same axial position as the measuring point of the contact temperature measuring tool on the static friction plate, and the temperature rise of the two points is consistent.

3. The method according to claim 2, characterized in that The step 2 specifically includes the following contents: According to the thermal imaging data, the time corresponding to the temperature data collected by the contact temperature measurement tool is corrected. The specific calculation formula is as follows: t‘ K =t K ·k t Among them, k t is the temperature measurement time correction coefficient, Δt K is the temperature rise time of the contact temperature measurement tool, Δt L Collect thermal imaging temperature rise time for non-contact temperature measurement tools, t K is the temperature measurement time of the contact temperature measurement tool, t' K Correct the time corresponding to the temperature data collected by the contact temperature measurement tool for thermal imaging data.

4. The method according to claim 2 or 3, characterized in that The step 3 specifically includes the following contents: The control system corrects the temperature data obtained by the non-contact temperature measurement tool based on the temperature rise data measured by the contact temperature measurement tool. The specific calculation formula is as follows: T‘ L =(T L -T L0 )·k T +T K0 Among them, k T is the temperature correction coefficient of the temperature measurement, ΔT K The temperature rise measured by the contact temperature measurement tool, ΔT L Collect thermal imaging temperature rise for non-contact temperature measurement tools, T L The temperature measured by the non-contact temperature measurement tool, T L0 is the initial value of non-contact temperature measurement, T K0 is the initial value of contact temperature measurement, T' L The control system uses the temperature rise data obtained by contact measurement to correct the non-contact temperature measurement data.

5. The method according to claim 4, characterized in that The Δt L and Δt K , Δt L The value range is 0-6s, Δt K The value range is 0-12s.

6. The method according to claim 4 or 5, characterized in that The contact temperature measuring tool and the non-contact temperature measuring tool, wherein the contact temperature measuring tool includes: a thermocouple and a thermal resistor, and the non-contact temperature measuring tool includes: an infrared radiation thermometer and a colorimetric thermometer.

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