A method for suppressing and monitoring the temperature rise of a double-helix coupling in the dynamic coil of a large-thrust vibration table

Abstract

The present invention discloses a method for suppressing and monitoring the temperature rise of a high-thrust vibrating platform's dynamic coil using a double-helix coupling. The method employs a tightly fitting double-layer dynamic coil winding structure, using two strands of hollow enameled wire wound in the same spiral direction, with inner and outer layers. The double-layer dynamic coil winding is powered in parallel. Temperature sensors are evenly arranged from the water inlet to the water outlet of the outer dynamic coil winding, and at the water outlet of the inner dynamic coil winding. The dynamic coil winding temperature distribution function is obtained by fitting a function reflecting different rates of temperature rise, taking into account the cooling water flow rate and drive current. This method reduces the dynamic coil drive current to half that of conventional methods, significantly suppressing the temperature rise of the high-thrust vibrating platform's dynamic coil. It also enables comprehensive monitoring of the temperature distribution of the double-layer drive coil, significantly improving the performance and safety of high-thrust electric vibrating platforms.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration platforms, and in particular to a method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a large-thrust vibration platform. Background Art

[0002] An electrodynamic vibration table is a type of mechanical environment simulation test equipment, primarily used to simulate the vibrational dynamic environment to which a test object is subjected, verifying its reliability and durability in this environment and supporting structural design improvements. Consequently, it is widely used in fields such as aviation, aerospace, weapons, and shipbuilding. Electrodynamic vibration tables operate according to the law of electromagnetic induction. When an alternating current is applied to a coil in a constant magnetic field, the coil is subjected to an electromagnetic force related to the current and magnetic field strength, generating the desired excitation force. As test objects become larger, the thrust requirements of the vibration table also increase.

[0003] Currently, mainstream electric vibrators on the market generally use a single-layer coil winding method. The demand for high thrust has led to a significant increase in the current of the drive coil. According to traditional design experience, the theoretical drive current of the dynamic coil at a thrust of 60t is approximately 6500A. When the thrust is increased to 100t, the corresponding drive current reaches approximately 10,000A. Such a large current will generate a huge amount of heat in the dynamic coil, requiring the addition of a high-power water cooling system to cool it down. This has limited the development progress of high-thrust vibrators. Therefore, how to effectively reduce the heat generated by the dynamic coil of high-thrust vibrators and thus suppress the temperature rise of the dynamic coil during use is a key issue that needs to be addressed.

[0004] At the same time, during the use of high-thrust vibration tables, the real-time temperature of a certain position on the dynamic coil is generally measured by pre-embedded thermocouple measuring points on the dynamic coil, and the temperature of this point is used to indicate the temperature of the entire drive coil. However, due to the differences in cooling effects on different parts of the dynamic coil, there are differences in the temperature distribution along the dynamic coil. This method has a large measurement error and is difficult to reflect the temperature conditions of other parts of the dynamic coil. It often causes inaccurate dynamic coil temperature monitoring, affects the assessment of the dynamic coil status of the vibration table, and poses certain operational safety risks. Summary of the Invention

[0005] To address the above problems, the present invention provides a method for suppressing and monitoring the temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform, which specifically includes the following steps:

[0006] Step S1: Two strands of hollow enameled wire are wound in the same spiral direction into inner and outer layers to form a tightly fitting double-layer dynamic winding structure, wherein the starting spiral angle of the inner dynamic winding is the same as the starting spiral angle of the outer dynamic winding, and the ending spiral angle of the inner dynamic winding is the same as the ending spiral angle of the outer dynamic winding;

[0007] Step S2: Short-circuiting the starting point of the inner dynamic winding and the starting point of the outer dynamic winding with a wire to form a wiring lead-out terminal 1, short-circuiting the ending point of the inner dynamic winding and the ending point of the outer dynamic winding with a wire to form a wiring lead-out terminal 2, and electrically connecting the wiring lead-out terminal 1 and the wiring lead-out terminal 2 to the vibration table power amplifier respectively;

[0008] Step S3: providing a connected water outlet at the midpoint of the inner and outer dynamic coil windings, thereby forming a double-layer dynamic coil winding cooling method with water inlet at both ends and water outlet in the middle;

[0009] Step S4: Starting from the water inlet of the outer dynamic winding, n temperature sensors are arranged on the outer dynamic winding in the spiral winding direction of the outer dynamic winding. They are denoted as temperature sensor i in the winding order. The angle coordinate of temperature sensor i relative to the water inlet of the outer dynamic winding along the coil winding direction is denoted as β. i , where: i = 1, 2, L, n; temperature sensor 1 is located at the water inlet of the outer dynamic winding, temperature sensor n is located at the water outlet of the outer dynamic winding, and temperature sensor n+1 is set at the water outlet of the inner dynamic winding;

[0010] Step S5: define the temperature rise change rate evaluation index ξ, the calculation formula of ξ is:

[0011]

[0012] Where: Q is the real-time measurement flow of the cooling water of the moving coil winding, I is the real-time measurement current of the moving coil winding, Q max is the maximum cooling water flow of the moving coil winding, I max is the maximum current of the moving coil winding;

[0013] Step S6: Measure the values of each temperature sensor in real time, and record the measured value of the i-th temperature sensor as T i , the measured value of temperature sensor n+1 is T n+1 , define β outer T is the angular coordinate of the outer moving coil relative to the temperature sensor 1 along the winding direction of the coil, outer (β outer ) The temperature distribution function of the outer dynamic winding is based on the measured values T1, T2, L, T of temperature sensor 1 to temperature sensor n. n and their corresponding angular coordinate values β1,β2,L,β n According to the different value ranges of the temperature rise rate evaluation index ξ, the function reflecting different temperature rise rates is fitted to obtain the outer dynamic winding temperature distribution function T outer (β outer ).

[0014] Step S7: Define βinner is the angular coordinate of the inner dynamic winding relative to the water inlet of the inner dynamic winding along the winding direction of the coil, and the temperature distribution function of the inner dynamic winding T inner (β inner ) can be estimated using the following formula

[0015]

[0016] Step S8: define the upper limit of the maximum temperature difference threshold δ between the inner and outer layers, and compare |T n+1 -T n | and the size of δ, if T n+1 -T n |>δ holds true, indicating that the dynamic winding layer where the higher temperature sensor n+1 and temperature sensor n is located is more seriously blocked than the other dynamic winding layer; if |T n+1 -T n |≤δ holds true, indicating that the internal conditions of the inner and outer dynamic winding coils are basically the same.

[0017] Furthermore, in step S6, the outer layer dynamic winding temperature distribution function T outer (β outer ) is estimated as follows:

[0018] If ξ<ξ min ,ξ min The temperature distribution function T of the outer dynamic winding is obtained by fitting and estimating the temperature rise rate lower limit threshold using a cubic polynomial function. outer (β outer );

[0019] If min ≤ξ≤ξ max ,ξ max The temperature distribution function T of the outer dynamic winding is obtained by fitting and estimating the temperature rise rate upper limit threshold using a quadratic polynomial function. outer (β outer );

[0020] If ξ>ξ max , the outer layer dynamic winding temperature distribution function T is obtained by fitting and estimating the polynomial function. outer (β outer ).

[0021] Furthermore, in step S8, the calculation formula of the upper limit of the maximum temperature difference threshold δ between the inner and outer layers is:

[0022]

[0023] Among them: the value range of δ0 is 25℃~20℃, and the value range of λ is 5℃~10℃.

[0024] Preferably, the hollow enameled wire has a rectangular or circular cross-section.

[0025] Preferably, the number n of the temperature sensors ranges from 4 to 6.

[0026] Preferably, the temperature sensors on the outer dynamic winding are arranged at equal distances.

[0027] Preferably, the temperature sensor is a thermocouple temperature sensor.

[0028] Preferably, the lower limit threshold value of the temperature rise change rate ξ min The value range is 0.7~1.1.

[0029] Preferably, the upper limit threshold value ξ of the temperature rise change rate max The value range is 2 to 2.5.

[0030] The beneficial effects of the present invention are as follows: 1. The present invention adopts a dynamic double-helix coupled parallel power supply method. Under this method, the length of the driving coil is twice that of the traditional mode, and the driving current is reduced to half of that in the traditional mode. Although the resistance of the driving coil is twice that in the traditional mode, it can still ensure that the overall heat generation in this case is only half of that in the traditional mode, thereby greatly suppressing the temperature rise of the dynamic coil of the high-thrust vibration table.

[0031] 2. The present invention obtains the temperature distribution along the entire outer dynamic winding by fitting multiple thermocouple temperature sensors at specific positions on the outer dynamic winding. It can comprehensively monitor the temperature conditions at various positions along the outer dynamic winding during the operation of the vibration table, overcoming the problem that the traditional method can only monitor the temperature of individual local points.

[0032] 3. In the process of monitoring the temperature rise of the outer dynamic coil winding, the present invention introduces a temperature rise change rate evaluation index. This index is used to optimize the function form in the temperature rise fitting process, accurately reflecting the temperature rise change rate along the dynamic coil under different cooling water flow rates and driving currents, and the accuracy of the outer dynamic coil temperature monitoring is higher.

[0033] 4. In the process of monitoring the temperature rise of the inner dynamic winding, the present invention only arranges one temperature sensor at the water outlet of the dynamic winding. The similarity of the temperature rise laws of the inner and outer dynamic windings is utilized, and the temperature difference at the water outlet is used for correction. This makes the temperature rise monitoring method of the inner dynamic winding simple, the number of sensors arranged is small, and the effect is good.

[0034] 5. The present invention overcomes the problem of missed blockage detection caused by a constant temperature difference threshold value through the difference in water outlet temperature of the inner and outer layers of the dynamic winding, combined with the set upper limit of the maximum temperature difference threshold value of the inner and outer layers that monotonically decreases with the evaluation index of the temperature rise change rate. It can make a preliminary diagnosis of whether there is a blockage problem inside the dynamic coil during the temperature rise monitoring process, thereby timely discovering related operational safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the overall scheme diagram of the invented dynamic double-helix coupled temperature rise suppression and monitoring method.

[0036] Figure 2 Schematic diagram of the double-helix coupled dynamic coil structure.

[0037] Figure 3 This is a detailed flow chart of the dynamic double-helix coupled temperature rise suppression and monitoring method. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the embodiments in the accompanying drawings:

[0039] To address the above problems, the present invention provides a method for suppressing and monitoring the temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform, which specifically includes the following steps:

[0040] Step S1: Two strands of hollow enameled wire are wound in the same spiral direction into inner and outer layers to form a tightly fitting double-layer dynamic winding structure, wherein the starting spiral angle of the inner dynamic winding is the same as the starting spiral angle of the outer dynamic winding, and the ending spiral angle of the inner dynamic winding is the same as the ending spiral angle of the outer dynamic winding. The hollow enameled wire has a rectangular or circular cross-section.

[0041] Step S2: Short-circuit the starting point of the inner dynamic winding and the starting point of the outer dynamic winding through a wire to form a wiring lead-out terminal 1, and short-circuit the end point of the inner dynamic winding and the end point of the outer dynamic winding through a wire to form a wiring lead-out terminal 2. The wiring lead-out terminal 1 and the wiring lead-out terminal 2 are electrically connected to the vibration table power amplifier respectively. In this case, the inner dynamic winding and the outer dynamic winding constitute a two-wire parallel (double-helix coupling) power supply form.

[0042] For an electric vibration table, the magnitude of the exciting force is proportional to the magnetic field strength, the length of the wire, and the magnitude of the current. Generally speaking, the magnetic field strength is constant. In the traditional mode, the electric vibration table adopts a single-wire winding method. In the traditional mode, the length of the moving coil wire is half of the double-wire parallel power supply method of the present invention. In order to ensure the rated exciting force, the driving current in the traditional mode needs to be twice that of the double-wire parallel power supply method of the present invention. The heat generated by the moving coil is proportional to the square of the driving current and the resistance of the driving coil. The length of the driving coil in the double-wire parallel power supply method of the present invention is twice that of the driving coil in the traditional mode, so the resistance of the driving coil is also twice that of the traditional mode. However, since the driving current is half of that in the traditional mode, the overall heat generated in this case is only half of that in the traditional mode, thereby greatly suppressing the temperature rise of the moving coil of the high-thrust vibration table.

[0043] Step S3: providing a connected water outlet at the midpoint of the inner and outer dynamic coil windings, thereby forming a double-layer dynamic coil winding cooling method with water inlet at both ends and water outlet in the middle;

[0044] Step S4: Starting from the water inlet of the outer dynamic winding, n temperature sensors are arranged on the outer dynamic winding in the spiral winding direction of the outer dynamic winding. They are denoted as temperature sensors i in the winding order. The temperature sensors on the outer dynamic winding are arranged in an equidistant manner like thermocouple temperature sensors. The angle coordinate of the temperature sensor i relative to the water inlet of the outer dynamic winding along the winding direction of the coil is denoted as β. i , where: i = 1, 2, L, n, the value range of n is 4 to 6; temperature sensor 1 is located at the water inlet of the outer dynamic winding, temperature sensor n is located at the water outlet of the outer dynamic winding, and temperature sensor n+1 is set at the water outlet of the inner dynamic winding;

[0045] Step S5: define the temperature rise change rate evaluation index ξ, the calculation formula of ξ is:

[0046]

[0047] Where: Q is the real-time measurement flow of the cooling water of the moving coil winding, I is the real-time measurement current of the moving coil winding, Q max is the maximum cooling water flow of the moving coil winding, I max The maximum current of the dynamic winding. This indicator can effectively reflect the cooling effect of the dynamic winding under different driving currents, and thus accurately reflect the temperature rise rate.

[0048] Step S6: Measure the values of each temperature sensor in real time, and record the measured value of the i-th temperature sensor as T i , the measured value of temperature sensor n+1 is T n+1 , define β outer T is the angular coordinate of the outer moving coil relative to the temperature sensor 1 along the winding direction of the coil,outer (β outer ) The temperature distribution function of the outer dynamic winding is based on the measured values T1, T2, L, T of temperature sensor 1 to temperature sensor n. n and their corresponding angular coordinate values β1,β2,L,β n According to the different value ranges of the temperature rise rate evaluation index ξ, the function reflecting different temperature rise rates is fitted to obtain the outer dynamic winding temperature distribution function T outer (β outer ), which is divided into the following three situations:

[0049] If ξ<ξ min ,ξ min is the lower limit threshold of the temperature rise rate, ξ min The value range of is 0.7~1.1. At this time, the cooling effect of the dynamic coil is poor, and the cooling effect becomes worse and worse from the coil water inlet to the water outlet. The closer to the water outlet, the faster the temperature rise rate. Therefore, a cubic polynomial function is used to fit and estimate the outer dynamic coil winding temperature distribution function T outer (β outer );

[0050] If min ≤ξ≤ξ max ,ξ max is the upper threshold of the temperature rise rate, ξ max The value range of is 2 to 2.5. At this time, the cooling effect of the dynamic coil is better. Although the cooling effect from the coil water inlet to the water outlet will still get worse, this trend has been greatly improved. The temperature increase rate near the water outlet is slowed down. Therefore, the quadratic polynomial function is used to fit and estimate the outer dynamic coil winding temperature distribution function T outer (β outer );

[0051] If ξ>ξ max Since the cooling effect of the dynamic coil is very good at this time, it can be considered that the temperature increase rate along the dynamic coil is basically the same. The temperature distribution function T of the outer dynamic coil winding is obtained by fitting and estimating the linear polynomial function. outer (β outer ).

[0052] Step S7: Define β inner is the angular coordinate of the inner dynamic winding relative to the water inlet of the inner dynamic winding along the winding direction of the coil. Since the inner dynamic winding and the outer dynamic winding have the same structure, cooling method, drive current, and cooling water flow, the temperature distribution law of the inner dynamic winding and the outer dynamic winding is basically the same in theory. Therefore, the temperature distribution function of the inner dynamic winding T inner (β inner ) can be estimated using the following formula

[0053]

[0054] In this way, slight changes in the inner and outer dynamic windings can be dynamically corrected based on the temperatures at the outlets of the inner and outer dynamic windings.

[0055] Step S8: define the upper limit of the maximum temperature difference threshold δ between the inner and outer layers, and compare |T n+1 -T n The magnitude of | and δ can be used to determine whether there is a significant difference in blockage between the inner and outer dynamic windings. This is because if one dynamic winding is severely blocked, its outlet temperature will inevitably be significantly higher than that of the other dynamic winding. Therefore, the specific judgment steps are as follows:

[0056] If |T n+1 -T n |>δ holds true, indicating that the dynamic winding layer where the higher temperature sensor n+1 and temperature sensor n is located is more seriously blocked than the other dynamic winding layer; if T n+1 -T n |≤δ holds true, indicating that the internal conditions of the inner and outer dynamic winding coils are basically the same. In order to achieve a more accurate judgment of the blockage inside the coil, the upper limit of the maximum temperature difference threshold δ between the inner and outer layers is calculated as follows:

[0057]

[0058] Among them: the value range of δ0 is 25℃~20℃, and the value range of λ is 5℃~10℃.

[0059] This approach is based on the fact that the temperature-rise-rate evaluation index ξ reflects the cooling effectiveness of the dynamic winding. A higher index indicates better cooling. In this case, even if a coil is blocked, the temperature difference between the inner and outer dynamic windings will be small. In this case, a smaller upper threshold for the maximum temperature difference between the inner and outer layers is required to detect blockage. Therefore, setting the upper threshold for the maximum temperature difference between the inner and outer layers to a monotonically decreasing function of the temperature-rise-rate evaluation index ξ overcomes the problem of missed blockage detection caused by a constant temperature difference threshold.

[0060] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by technicians in the relevant technical field without departing from the spirit of the present invention are all within the scope of protection of the claims of the present invention.

Claims

1. A method for suppressing and monitoring the temperature rise of a double-helix coupled dynamic coil of a large-thrust vibration table, characterized in that: The following steps are involved: S1. Two strands of hollow enameled wire are wound in the same spiral direction into an inner and outer layer to form a tightly fitting double-layer dynamic winding structure. The starting spiral direction angle of the inner dynamic winding is the same as the starting spiral direction angle of the outer dynamic winding, and the ending spiral direction angle of the inner dynamic winding is the same as the ending spiral direction angle of the outer dynamic winding; S2. Short-circuit the starting point of the inner dynamic winding and the starting point of the outer dynamic winding with a wire to form a wiring lead-out terminal 1, and short-circuit the end point of the inner dynamic winding and the end point of the outer dynamic winding with a wire to form a wiring lead-out terminal 2. Electrically connect the wiring lead-out terminal 1 and the wiring lead-out terminal 2 to the vibration table power amplifier respectively; S3. Connecting water outlets are provided at the midpoints of the inner and outer dynamic coil windings, forming a double-layer dynamic coil winding cooling method with water inlet at both ends and water outlet in the middle; S4. Starting from the water inlet of the outer dynamic winding, n temperature sensors are arranged on the outer dynamic winding in the spiral winding direction. They are denoted as temperature sensor i in the winding order. The angle coordinate of temperature sensor i relative to the water inlet of the outer dynamic winding along the coil winding direction is denoted as β. i , where: i = 1, 2, L, n; temperature sensor 1 is located at the water inlet of the outer dynamic winding, temperature sensor n is located at the water outlet of the outer dynamic winding, and temperature sensor n+1 is set at the water outlet of the inner dynamic winding; S5. Define the temperature rise rate evaluation index ξ. The calculation formula of ξ is: Where: Q is the real-time measurement flow of the cooling water of the moving coil winding, I is the real-time measurement current of the moving coil winding, Q max is the maximum cooling water flow of the moving coil winding, I max is the maximum current of the moving coil winding; S6. Measure the values of each temperature sensor in real time, and record the measured value of the i-th temperature sensor as T i , the measured value of temperature sensor n+1 is T n+1 , define β outer T is the angular coordinate of the outer moving coil relative to the temperature sensor 1 along the winding direction of the coil, outer (β outer ) The temperature distribution function of the outer dynamic winding is based on the measured values T1, T2, L, T of temperature sensor 1 to temperature sensor n. n and their corresponding angular coordinate values β1,β2,L,β n According to the different value ranges of the temperature rise rate evaluation index ξ, the function reflecting different temperature rise rates is fitted to obtain the outer dynamic winding temperature distribution function T outer (β outer ); S7. Define β inner is the angular coordinate of the inner dynamic winding relative to the water inlet of the inner dynamic winding along the winding direction of the coil, and the temperature distribution function of the inner dynamic winding T inner (β inner ) can be estimated using the following formula S8. Define the upper limit of the maximum temperature difference threshold δ between the inner and outer layers, and compare |T n+1 -T n | and the size of δ, if T n+1 -T n |>δ holds true, indicating that the dynamic winding layer where the higher temperature sensor n+1 and temperature sensor n is located is more seriously blocked than the other dynamic winding layer; if |T n+1 -T n |≤δ holds true, indicating that the internal conditions of the inner and outer dynamic winding coils are basically the same.

2. The method for suppressing and monitoring the temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: In step S6, the outer layer dynamic winding temperature distribution function T outer (β outer ) is estimated as follows: If ξ<ξ min ,ξ min The temperature distribution function T of the outer dynamic winding is obtained by fitting and estimating the temperature rise rate lower limit threshold using a cubic polynomial function. outer (β outer ); If min ≤ξ≤ξ max ,ξ max The temperature distribution function T of the outer dynamic winding is obtained by fitting and estimating the temperature rise rate upper limit threshold using a quadratic polynomial function. outer (β outer ); If ξ>ξ max , the outer layer dynamic winding temperature distribution function T is obtained by fitting and estimating the polynomial function. outer (β outer ).

3. The method for suppressing and monitoring the temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: In step S8, the calculation formula of the upper limit of the maximum temperature difference threshold δ between the inner and outer layers is: Among them: the value range of δ0 is 25℃~20℃, and the value range of λ is 5℃~10℃.

4. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The hollow enameled wire has a rectangular or circular cross section.

5. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The value range of the number n of the temperature sensors is 4 to 6.

6. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The temperature sensors on the outer dynamic winding are arranged in an equidistant manner.

7. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The temperature sensor is a thermocouple temperature sensor.

8. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The lower limit threshold value ξ of the temperature rise change rate min The value range is 0.7~1.

1.

9. The method for suppressing and monitoring temperature rise of a double-helix coupled dynamic coil of a high-thrust vibration platform according to claim 1 is characterized in that: The upper limit threshold value ξ of the temperature rise change rate max The value range is 2 to 2.5.

Images