A large thrust vibration table driving coil along-line temperature estimation method and system

Abstract

The application discloses a large-thrust vibration table driving coil along-line temperature estimation method and system, which is suitable for a driving coil structure with water inlet at both ends and water outlet in the middle. Temperature sensors are arranged equidistantly along the winding direction of the driving coil from the water inlet to the middle water outlet in the upper layer. The temperature distribution of the upper layer is linearly fitted by monitoring the temperature value of the temperature sensor in real time, and then the temperature distribution of the lower layer driving coil is obtained symmetrically. Further, the temperature rise of the driving coil is accurately evaluated by using the temperature value at the end of the driving coil, the slope increment ratio of the temperature fitting curve after a period of time, and the like. The application realizes comprehensive monitoring of the temperature distribution along the line of the entire driving coil and online accurate evaluation of the temperature rise, thereby providing support for guaranteeing the use performance and service life of the driving coil.

Description

Technical Field

[0001] This invention relates to the field of vibration table technology, and specifically to a method and system for estimating the temperature along the drive coil of a high-thrust vibration table. Background Technology

[0002] In modern engineering technology, a high-thrust vibration table is a vibration device capable of generating significant thrust. It is widely used in aerospace, automotive, and electronics industries to simulate the vibration environment experienced by products during actual use, thereby testing their reliability and durability. The drive coil of the high-thrust vibration table, as the hub of energy conversion, bears the crucial responsibility of converting electrical energy into mechanical energy to drive the table's vibration. During operation, to generate a sufficiently strong electromagnetic force to achieve high thrust output, a large current needs to be supplied to the drive coil. This inevitably generates a significant amount of heat within the drive coil. If this heat accumulation is not effectively managed, it will affect its performance and lifespan.

[0003] In traditional technologies, current measurement methods can be divided into two types: contact and non-contact measurement. Contact measurement is generally achieved by pre-embedding thermocouple measuring points on the drive coil, while non-contact measurement is generally achieved by installing a temperature sensor inside the vibration table body, directly opposite the drive coil. Existing measurement methods can only measure the temperature at the sensor's installation location. This method only reflects the temperature at the measurement point. However, since the drive coil is actually quite long, temperatures vary at different locations. Current measurement methods cannot comprehensively reflect the temperature distribution of the entire drive coil, easily missing local hot spots during measurement. This affects the accurate assessment of the actual heating state of the high-thrust vibration table drive coil, posing operational safety hazards due to inaccurate temperature monitoring. Summary of the Invention

[0004] To address the above problems, this invention provides a method for estimating the temperature along the drive coil of a high-thrust vibration table. The drive coil employs a cooling structure with water inlet at both ends and water outlet in the middle, specifically including the following steps:

[0005] Step S1: Divide the vibration table drive coil into upper and lower layers from the middle water outlet. Arrange n temperature sensors sequentially along the winding direction of the drive coil from the water inlet to the middle water outlet of the upper layer drive coil. Let L be the distance from the location of the i-th temperature sensor to the water inlet of the upper layer drive coil. i , where: i = 1, 2, 3, ..., n, the first temperature sensor is located at the water inlet of the upper drive coil, and the nth temperature sensor is located at the water outlet in the middle of the drive coil;

[0006] Step S2: Monitor the temperature values ​​of the n temperature sensors on the vibration table in real time, and record the value of the i-th temperature sensor as T. iThe upper drive coil is divided into n-1 segments from the inlet to the middle outlet based on the temperature sensors. The temperature distribution of the upper drive coil from the inlet to the middle outlet is obtained by linear fitting of the measured values ​​of two temperature sensors in each segment. Specifically, the temperature distribution along the line of the drive coil in the j-th segment is determined by the value T of the j-th temperature sensor. j Temperature sensor T (j+1th) j+1 The linear fit yielded the following expression:

[0007]

[0008] Wherein: T Lj Let j represent the temperature of a point in segment j that is L long from the inlet of the upper drive coil, where j = 1, 2, 3, L, n-1;

[0009] Step S3: Based on the temperature distribution along the upper driving coil, obtain the temperature distribution along the lower driving coil from the inlet to the middle outlet symmetrically.

[0010] Step S4: Preliminary assessment of the cooling effect of the drive coil, determining the value T of the nth temperature sensor. n Does T satisfy? n ≥T max , where: T max The upper limit of the temperature threshold, if T n <T max If T n Satisfy T n ≥T max If so, it is determined that the vibration table drive coil has an over-temperature problem and poor cooling effect;

[0011] Step S5: After an interval of Δt, following the steps S2 to S3, fit the temperature distribution along the drive coil after Δt time again. The expression for the temperature distribution along the drive coil in the j-th segment after Δt time is:

[0012]

[0013] Wherein: T L ′ j T represents the temperature at a point L, a distance from the inlet of the upper drive coil, in the j-th segment after time Δt. j ' represents the temperature sensor value after time Δt, where T is the value of the j-th temperature sensor. j ′ +1 This indicates the (j+1)th temperature sensor after time Δt, where j = 1, 2, 3, ..., n-1; continue to the next operation;

[0014] Step S6: Calculate the slope increment ratio Δk after time Δt. The calculation formula is as follows: Determine whether Δk satisfies Δk≥k max , where: k max The upper limit of the slope increment ratio threshold is defined as follows: if Δk satisfies Δk≥k max If the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect, then it is determined that the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect; if Δk < k max If so, proceed to the next step;

[0015] Step S7: Determine whether Δk satisfies k min <Δk<k max , where: k min The lower limit of the slope increment ratio threshold is given by k. min <Δk<k max If the temperature rise of the vibration table drive coil is relatively gradual and the cooling effect is good, then it can be determined that the temperature rise is relatively gradual and the cooling effect is good; if Δk≤k min If the vibration table drive coil has no risk of excessive temperature rise and the cooling effect is very good, it can be determined that the vibration table drive coil has no risk of excessive temperature rise.

[0016] Preferably, the number n of temperature sensors ranges from 5 to 10.

[0017] Preferably, the n temperature sensors are arranged at equal distances.

[0018] Preferably, the temperature sensor is a thermocouple temperature sensor.

[0019] Preferably, the upper limit of the temperature threshold T max The value range is 80℃~120℃.

[0020] Preferably, the interval time Δt ranges from 60s to 120s.

[0021] Preferably, the upper limit of the slope increment ratio threshold k max The value range is 1.6 to 2.

[0022] Preferably, the lower limit k of the slope increment ratio threshold min The value range is 1.1 to 1.2.

[0023] This invention further discloses a temperature estimation system along the drive coil of a high-thrust vibration table, comprising a drive coil, temperature sensors, and an external control module. The drive coil has n temperature sensors arranged sequentially along its winding direction from the inlet to the middle outlet. The first temperature sensor is located at the inlet of the upper drive coil, and the nth temperature sensor is located at the middle outlet of the drive coil. The multiple temperature sensors are electrically connected to the external control module via data lines, employing the aforementioned temperature estimation method along the drive coil of a high-thrust vibration table.

[0024] Beneficial effects

[0025] 1. This invention arranges multiple thermocouple temperature sensors at equal intervals at specific locations on the upper layer of the drive coil, enabling the acquisition of temperature data from different locations on the upper layer. By linearly fitting the upper layer temperature distribution and symmetrically obtaining the lower layer temperature distribution, comprehensive monitoring of the temperature distribution along the entire drive coil is achieved. This avoids the problem of missing local hot spots due to the limitation of measurement points, and can reflect the temperature conditions of various parts of the coil in more detail, greatly improving the comprehensiveness and accuracy of temperature monitoring.

[0026] 2. Based on the fitted temperature-length function, this invention uses the comparison between the end temperature value and the set threshold to make a preliminary judgment, which can quickly screen out possible abnormal temperature rise problems of the drive coil, and then give a judgment on whether the cooling effect of the drive coil meets the standard.

[0027] 3. This invention introduces the parameter of slope increment ratio to analyze the temperature rise of the drive coil from the perspective of temperature change trend. By comparing the function slope changes at different times, it is possible not only to determine the temperature rise of the drive coil, but also to classify the degree of temperature rise change in more detail, which helps to detect potential temperature rise anomalies in a timely manner and take targeted measures. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall scheme for estimating the temperature along the drive coil of the invention.

[0029] Figure 2 A detailed flowchart of the method for estimating the temperature along the drive coil of the invention. Detailed Implementation

[0030] The present invention will now be further described with reference to the embodiments shown in the accompanying drawings:

[0031] This invention provides a method for estimating the temperature along the drive coil of a high-thrust vibration table. The drive coil adopts a cooling structure with water inlet at both ends and water outlet in the middle. The method specifically includes the following steps:

[0032] Step S1: Divide the vibration table drive coil into upper and lower layers from the middle water outlet. Arrange n temperature sensors sequentially along the winding direction of the drive coil from the water inlet to the middle water outlet on the upper layer drive coil. The value of n ranges from 5 to 10. Let L be the distance from the location of the i-th temperature sensor to the water inlet of the upper layer drive coil. i , where i = 1, 2, 3, ..., n, the first temperature sensor is located at the water inlet of the upper drive coil, the nth temperature sensor is located at the water outlet in the middle of the drive coil, and the n temperature sensors are arranged at equal distances. The temperature sensors are thermocouple temperature sensors.

[0033] Step S2: Monitor the temperature values ​​of the n temperature sensors on the vibration table in real time, and record the value of the i-th temperature sensor as T. i The upper drive coil is divided into n-1 segments from the inlet to the middle outlet based on the n temperature sensors. The temperature distribution of the upper drive coil from the inlet to the middle outlet is obtained by linear fitting of the measured values ​​of two temperature sensors in each segment. Specifically, the temperature distribution along the line of the drive coil in the j-th segment is determined by the value T of the j-th temperature sensor. j Temperature sensor T (j+1th) j+1 The linear fitting yielded the following expression:

[0034]

[0035] Wherein: T Lj Let j represent the temperature at a point in segment j that is L long from the inlet of the upper drive coil, where j = 1, 2, 3, L, n-1;

[0036] Step S3: Based on the temperature distribution along the upper driving coil, obtain the temperature distribution along the lower driving coil from the inlet to the middle outlet symmetrically.

[0037] Beneficial effects: The drive coil adopts a cooling structure with water inlet at both ends and water outlet in the middle. Therefore, there is no need to place a large number of additional sensors in the lower layer. The temperature distribution of the lower drive coil can be obtained symmetrically based on the temperature distribution along the upper drive coil, which reduces cost and system complexity, while achieving comprehensive acquisition of the temperature distribution of the entire drive coil.

[0038] Step S4: Preliminary assessment of the cooling effect of the drive coil, determining the value T of the nth temperature sensor. n Does T satisfy? n ≥T max , where: T max T is the upper limit of the temperature threshold. max The value range is 80℃~120℃, if T n <T max If T n Satisfy T n ≥T max If so, it is determined that the vibration table drive coil has an over-temperature problem and poor cooling effect;

[0039] Beneficial effects: By determining whether the value of the nth temperature sensor exceeds the upper limit of the temperature threshold, it is possible to quickly and preliminarily determine whether there is a temperature over-limit problem in the drive coil and promptly detect situations with poor cooling effect;

[0040] Step S5: After an interval of Δt (where Δt ranges from 60s to 120s), following steps S2 to S3, again fit the temperature distribution along the drive coil after Δt time. The expression for the temperature distribution along the drive coil in the j-th segment after Δt time is:

[0041]

[0042] Wherein: T L ′ j T represents the temperature at a point L, a distance from the inlet of the upper drive coil, in the j-th segment after time Δt. j ' represents the temperature sensor value after time Δt, where T is the value of the j-th temperature sensor. j ′ +1 This indicates the (j+1)th temperature sensor after time Δt, where j = 1, 2, 3, ..., n-1; continue to the next operation;

[0043] Step S6: Calculate the slope increment ratio Δk after time Δt. The calculation formula is as follows: Determine whether Δk satisfies Δk≥k max , where: k max k is the upper limit of the slope increment ratio threshold. max The value range of Δk is 1.6 to 2. If Δk satisfies Δk ≥ k max If the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect, then it is determined that the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect; if Δk < k max If so, proceed to the next step;

[0044] Beneficial effects: After a certain period of time, the data acquisition and fitting steps are repeated to obtain the temperature distribution along the drive coil after a certain period of time. This allows for real-time tracking of the temperature change of the drive coil over time, timely detection of temperature change trends, and provides data support for accurately evaluating the cooling effect.

[0045] Step S7: Determine whether Δk satisfies k min <Δk<k max , where: k min k is the lower limit of the slope increment ratio threshold. min The value range of k is 1.1 to 1.2. min <Δk<k max If the temperature rise of the vibration table drive coil is relatively gradual and the cooling effect is good, then it can be determined that the temperature rise is relatively gradual and the cooling effect is good; if Δk≤k min If the vibration table drive coil has no risk of excessive temperature rise and the cooling effect is very good, it can be determined that the vibration table drive coil has no risk of excessive temperature rise.

[0046] Beneficial effects: By calculating and comparing the slope increment ratio with the upper limit of the threshold, the cooling effect can be analyzed in depth from the perspective of temperature change trend. Compared with the traditional single temperature comparison method, it can more accurately determine whether there is a hidden danger of excessive temperature rise in the drive coil, thus improving the accuracy of cooling effect evaluation.

[0047] This invention further discloses a temperature estimation system along the drive coil of a high-thrust vibration table, comprising a drive coil, temperature sensors, and an external control module. The drive coil has n temperature sensors arranged sequentially along its winding direction from the inlet to the middle outlet. The first temperature sensor is located at the inlet of the upper drive coil, and the nth temperature sensor is located at the middle outlet of the drive coil. The multiple temperature sensors are electrically connected to the external control module via data lines, employing the aforementioned temperature estimation method along the drive coil of a high-thrust vibration table.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A method for estimating the temperature along the drive coil of a high-thrust vibration table, wherein the drive coil adopts a cooling structure with water inlet at both ends and water outlet in the middle, characterized in that, Includes the following steps: S1. Divide the vibration table drive coil into upper and lower layers from the middle water outlet. Arrange n temperature sensors sequentially along the winding direction of the drive coil from the water inlet to the middle water outlet of the upper layer drive coil. Let L be the distance from the location of the i-th temperature sensor to the water inlet of the upper layer drive coil. i , where: i = 1, 2, 3, ..., n, the first temperature sensor is located at the water inlet of the upper drive coil, and the nth temperature sensor is located at the water outlet in the middle of the drive coil; S2. Monitor the temperature values ​​of n temperature sensors on the vibration table in real time, and denot the value of the i-th temperature sensor as T. i The upper drive coil is divided into n-1 segments from the inlet to the middle outlet based on the temperature sensors. The temperature distribution of the upper drive coil from the inlet to the middle outlet is obtained by linear fitting of the measured values ​​of two temperature sensors in each segment. Specifically, the temperature distribution along the line of the drive coil in the j-th segment is determined by the value T of the j-th temperature sensor. j Temperature sensor T (j+1th) j+1 The linear fit yielded the following expression: Wherein: T Lj Let j represent the temperature of a point in segment j that is L long from the inlet of the upper drive coil, where j = 1, 2, 3, L, n-1; S3. Based on the temperature distribution along the upper driving coil, the temperature distribution along the lower driving coil from the inlet to the middle outlet is obtained symmetrically. S4. Preliminary assessment of the cooling effect of the drive coil, determining the value T of the nth temperature sensor. n Does T satisfy? n ≥T max , where: T max The upper limit of the temperature threshold, if T n <T max If T n Satisfy T n ≥T max If so, it is determined that the vibration table drive coil has an over-temperature problem and poor cooling effect; S5. After an interval of Δt, following steps S2 to S3, fit the temperature distribution along the drive coil after Δt time again. The expression for the temperature distribution along the drive coil in the j-th segment after Δt time is: Wherein: T L ′ j T represents the temperature at a point L, a distance from the inlet of the upper drive coil, in the j-th segment after time Δt. j ' represents the temperature sensor value after time Δt, where T is the value of the j-th temperature sensor. j ′ +1 This indicates the (j+1)th temperature sensor after time Δt, where j = 1, 2, 3, ..., n-1; continue to the next operation; S6. Calculate the slope increment ratio Δk after time Δt. The formula is as follows: Determine whether Δk satisfies Δk≥k max , where: k max The upper limit of the slope increment ratio threshold is defined as follows: if Δk satisfies Δk≥k max If the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect, then it is determined that the vibration table drive coil has a risk of excessively rapid temperature rise and poor cooling effect; if Δk < k max If so, proceed to the next step; S7. Determine whether Δk satisfies k. min <Δk<k max , where: k min The lower limit of the slope increment ratio threshold is given by k. min <Δk<k max If the temperature rise of the vibration table drive coil is relatively gradual and the cooling effect is good, then it can be determined that the temperature rise is relatively gradual and the cooling effect is good; if Δk≤k min If the vibration table drive coil has no risk of excessive temperature rise and the cooling effect is very good, it can be determined that the vibration table drive coil has no risk of excessive temperature rise.

2. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The number of temperature sensors, n, ranges from 5 to 10.

3. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The n temperature sensors are arranged at equal intervals.

4. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The temperature sensor is a thermocouple temperature sensor.

5. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The upper limit of the temperature threshold T max The value range is 80℃~120℃.

6. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The interval time Δt ranges from 60s to 120s.

7. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The upper limit of the slope increment ratio threshold k max The value range is 1.6 to 2.

8. The method for estimating the temperature along the driving coil of a high-thrust vibration table according to claim 1, characterized in that, The lower limit of the slope increment ratio threshold k min The value range is 1.1 to 1.

2.

9. A temperature estimation system along the drive coil of a high-thrust vibration table, comprising a drive coil, temperature sensors, and an external control module, wherein n temperature sensors are arranged sequentially along the winding direction of the drive coil from the inlet to the middle outlet, the first temperature sensor is located at the inlet of the upper drive coil, the nth temperature sensor is located at the middle outlet of the drive coil, and the plurality of temperature sensors are electrically connected to the external control module via data lines, characterized in that, The external control module employs a method for estimating the temperature along the drive coil of a high-thrust vibration table as described in any one of claims 1 to 8.

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