Radius-adjustable load device for loading equivalent electromagnetic stress and experimental method
By designing an adjustable radius load device and using mechanical loading to simulate the equivalent electromagnetic stress field under room temperature and deep cryogenic conditions, the problem of difficulty in applying controllable electromagnetic stress in existing technologies is solved, and precise stress loading and safety improvement of optical fiber sensors are achieved. It is suitable for the research of optical fiber sensing materials and the design of superconducting devices.
Patent Information
- Application Number
- CN202511213151.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-28
- Publication Date
- 2025-10-17
AI Technical Summary
Existing technologies make it difficult to independently apply controllable and adjustable equivalent electromagnetic stress at room temperature and liquid nitrogen environments, especially in the study of the mechanical properties of high-temperature superconducting coils and their integrated optical fiber sensors. Traditional methods rely on real electromagnetic excitation processes, which are costly and have poor safety and repeatability.
An adjustable radius loading device was designed, which included a limit base, an adjustable radius loading ring and a sliding bearing base. The equivalent electromagnetic stress field was simulated at room temperature or deep cryogenic conditions by mechanical loading. Adjustable height studs and low thermal expansion coefficient materials were used to achieve repeatable and wide-adjustable stress loading on the optical fiber sensor.
It achieves precise stress loading on optical fiber sensors under room temperature and deep cryogenic conditions, reduces experimental costs, improves safety and repeatability, and is suitable for the study of mechanical response of optical fiber sensing materials and the engineering design of superconducting devices.
Smart Images
Figure CN120800746A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of optical fiber sensing test, and more particularly to a loading equivalent electromagnetic stress adjustable radius load device and an experimental method. BACKGROUND
[0002] High-temperature superconducting magnets and related application devices are often accompanied by large electromagnetic forces during excitation or flow, especially in high magnetic field environments, and the superconducting coils and the optical fiber sensors arranged therein often bear significant electromagnetic stress. Currently, the commonly used electromagnetic stress test relies on actual excitation conditions and physical tests.
[0003] Under the existing experimental conditions, it is difficult to independently apply controllable and adjustable equivalent electromagnetic stress, especially in the mechanical property research of high-temperature superconducting coils and the integrated optical fiber sensors therein. Traditional methods often rely on real electromagnetic excitation processes to apply circumferential or radial stress, but this process often requires large-capacity power supply and complex deep cryogenic environment, which is costly, and has poor safety and repeatability.
[0004] Therefore, there is an urgent need for a loading device that can simulate equivalent electromagnetic stress in normal temperature and liquid nitrogen experimental environments to verify the mechanical reliability and working stability of optical fibers and their packaging structures. SUMMARY
[0005] The application aims to overcome the above-mentioned deficiencies and provide an adjustable radius load device with compact structure, continuous adjustable radius, and accurately controllable loading force. By means of pure mechanical loading, the equivalent electromagnetic stress field is simulated under normal temperature or deep cryogenic experimental conditions, meeting the needs of repeatable and adjustable range wide stress loading experiments on flexible sensitive elements such as optical fiber sensors, facilitating the in-depth study of the mechanical response and reliability of optical fiber sensing materials under equivalent electromagnetic force conditions, and further providing experimental verification basis for the engineering design and safe operation of superconducting devices and optical fiber sensing systems.
[0006] To achieve the above-mentioned purposes, the application adopts the following technical solutions:
[0007] An adjustable radius load device for loading equivalent electromagnetic stress, comprising:
[0008] A limiting base;
[0009] An adjustable radius loading ring, which is adjustably connected with the limiting base in height to adapt to the requirements of different liquid nitrogen liquid levels;
[0010] Wherein, the loading ring can change the diameter of the ring load to adjust the circumferential stress applied to the measured element; the limiting base is used to fix the measured element and provide support for the loading ring.
[0011] Further, a slidable bearing base is further included, the slidable bearing base is connected with the loading ring, and the annular diameter of the loading ring can be expanded or reduced by rotating the slidable bearing base.
[0012] Further, at least three height-adjustable studs are further included, the at least three height-adjustable studs are arranged in an annular array, wherein the limiting base is provided with through holes corresponding to the at least three height-adjustable studs, the loading ring is provided with threaded holes corresponding to the at least three through holes, and the height-adjustable studs are matched with the threaded holes through the corresponding through holes, so as to adjust the height according to the experimental requirements and adapt to the requirements of different liquid nitrogen liquid level heights.
[0013] Further, the loading ring is composed of a segmented annular loading structure and is made of a low-thermal-expansion-coefficient material, so as to maximize the reduction of the influence of temperature on the size of the workpiece.
[0014] An experimental method for loading adjustable-radius load of equivalent electromagnetic stress, which adopts the loading equivalent electromagnetic stress adjustable-radius load device according to any one of the above, and the experimental method comprises the following steps:
[0015] S10, experimental preparation
[0016] According to the size and shape of the optical fiber or superconducting coil to be measured, a suitable model of adjustable-radius loading ring and limiting base is selected;
[0017] S20, sample fixing
[0018] The optical fiber to be measured is placed in the positioning groove of the loading ring, the central position of the optical fiber to be measured relative to the loading ring is adjusted, the circumferential uniformity, tilt or looseness of the sample are ensured, and the sample is preliminarily fixed by using a flexible clamp or low-temperature glue;
[0019] S30, loading ring pre-adjustment
[0020] The sample is placed in a normal temperature and liquid nitrogen environment, the size and angle of the radius expansion of the loading ring are calibrated and calculated respectively, and the accuracy of the experimental data is ensured;
[0021] S40, applying equivalent circumferential stress
[0022] The slidable bearing base is slowly rotated, the loading ring is gradually expanded along the radial direction, and the loading ring is gradually and uniformly adjusted to the required target radius, so as to apply the expected equivalent electromagnetic circumferential stress to the sample;
[0023] S50, loading keeping and data acquisition
[0024] When the loading ring reaches the target set radius, a stable loading state is maintained, during which the collection and recording of optical fiber performance parameters can be carried out; in the experiment under the condition of deep low temperature, after the initial loading is completed at room temperature, the whole device is slowly placed into a liquid nitrogen tank, and then the second loading fine adjustment calibration is carried out after the temperature is stable, so that the stress simulation under low temperature is consistent with the real working condition;
[0025] S60, unloading and resetting
[0026] After the experiment is completed, the driving adjustment mechanism of the slidable bearing base is slowly reversed to gradually increase the radius of the loading ring until the loading ring is completely separated from the sample;
[0027] The measured sample is taken out, and the loading ring, the limiting base and the buffer assembly are cleaned and inspected to ensure the repeatability and accuracy of subsequent use.
[0028] Compared with the prior art, the present application has the following beneficial effects:
[0029] 1. The structure design is flexible, and controllable circumferential stress can be applied to optical fibers, superconducting coils and other components in different experimental environments;
[0030] 2. The radius is continuously adjustable, and various electromagnetic stress working conditions can be accurately simulated;
[0031] 3. The operation is simple, the repeatability and maintainability are good, and the experimental cost is significantly reduced;
[0032] 4. It is compatible with liquid nitrogen experimental environment and suitable for superconducting and low temperature optical fiber sensing test scene. BRIEF DESCRIPTION OF DRAWINGS
[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.
[0034] Figure 1 It is a structure schematic view of a kind of adjustable radius load device of loading equivalent electromagnetic stress;
[0035] Figure 2 It is another view of a kind of adjustable radius load device of loading equivalent electromagnetic stress;
[0036] Figure 3 It is a structure schematic view of a kind of adjustable radius load device of loading equivalent electromagnetic stress placed in liquid nitrogen tank;
[0037] Wherein, 1, limit base; 2, slidable bearing base; 3, loading ring; 4, height adjustable stud; 5, liquid nitrogen tank. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0039] Embodiment 1
[0040] Reference Figures 1-2 A loading device with adjustable radius for loading equivalent electromagnetic stress, comprising:
[0041] The limit base 1;
[0042] The loading ring 3 with adjustable radius is connected with the limit base 1 in adjustable height to adapt to the requirement of different liquid nitrogen liquid level height;
[0043] Among them, the loading ring 3 can change the diameter of the ring load to adjust the size of the ring stress applied to the measured element; the limit base 1 is used to fix the measured member and provide support for the loading ring 3.
[0044] The loading device with adjustable radius for loading equivalent electromagnetic stress provided in the embodiment further comprises a slidable bearing base 2, the slidable bearing base 2 and the loading ring 3 are connected, and the ring diameter of the loading ring 3 can be expanded or reduced by rotating the slidable bearing base 2.
[0045] The loading device with adjustable radius for loading equivalent electromagnetic stress provided in the embodiment further comprises at least three height adjustable studs 4, the at least three height adjustable studs 4 are arranged in a ring array, wherein the limit base 1 is provided with through holes corresponding to the at least three height adjustable studs 4, and the loading ring 3 is provided with threaded holes corresponding to the at least three through holes, the height adjustable studs 4 are matched with the corresponding through holes and threaded holes to adjust the height according to the experimental requirements, and adapt to the requirement of different liquid nitrogen liquid level height.
[0046] Specifically, the height adjustable studs 4 are three, the three height adjustable studs 4 are arranged in a ring array and arranged between the loading ring 3 and the limit base 1, wherein the limit base 1 is provided with three through holes, and the loading ring 3 is provided with three threaded holes corresponding to the through holes.
[0047] In the embodiment, the loading ring 3 is composed of a segmented ring loading structure, and a low thermal expansion coefficient material is selected to maximize the reduction of the influence of temperature on the size of the workpiece.
[0048] The adjustable radius load device for loading equivalent electromagnetic stress provided by the embodiment can generate controllable hoop stress on the outer periphery of the measured member by adjusting the radius of the loading ring 3, and equivalently simulates the hoop stress state generated by electromagnetic force in actual work. Compared with the traditional electromagnetic excitation mode, the device has simple structure, does not need to be energized and excited, is high in experimental safety and repeatability, and can be flexibly applied under normal temperature and deep low temperature conditions.
[0049] Embodiment 2
[0050] Reference Figure 3 An experimental method for loading adjustable radius load of equivalent electromagnetic stress, which adopts the adjustable radius load device for loading equivalent electromagnetic stress provided in Embodiment 1. The experimental method comprises the following steps:
[0051] S10, experimental preparation
[0052] According to the size and shape of the measured optical fiber or superconducting coil, a suitable model of adjustable radius loading ring 3 and limiting base 1 are selected, and it is checked whether each component of the loading device is intact, whether the driving adjustment mechanism operates flexibly, and whether the surface of the buffer assembly is free of foreign matter or damage;
[0053] S20, sample fixing
[0054] The measured optical fiber is placed in the positioning groove of the loading ring 3, the central position of the optical fiber relative to the loading ring 3 is adjusted, it is ensured that the sample is uniformly circumferential, without inclination or looseness, and a flexible clamp or low-temperature glue is used for preliminary fixing;
[0055] S30, pre-adjustment of the loading ring 3
[0056] Since the size of the workpiece will inevitably be affected under deep low temperature conditions, the size and angle of the radius expansion of the loading ring 3 are calibrated and calculated respectively under normal temperature and liquid nitrogen environment, so as to ensure the accuracy of the experimental data;
[0057] S40, applying equivalent hoop stress
[0058] The slidable bearing base is slowly rotated, the loading ring 3 is gradually expanded along the radial direction, and the target radius is gradually and uniformly adjusted, so as to apply the expected equivalent electromagnetic hoop stress to the sample;
[0059] S50, loading retention and data acquisition
[0060] When the loading ring 3 reaches the target set radius, a stable loading state is maintained, and the collection and recording of the performance parameters such as optical fiber optical signal can be carried out during this period. Under deep low temperature conditions, after the initial loading is completed at room temperature, the entire device is slowly placed into the liquid nitrogen tank 5, and then the secondary loading fine adjustment calibration is carried out after the temperature is stabilized, so as to ensure that the stress simulation under low temperature is consistent with the actual working condition.
[0061] S60, unloading and resetting
[0062] After the experiment, slowly reverse rotation of the drive adjustment mechanism of the slidable bearing base, so that the loading ring 3 radius gradually increases, until completely separated from the sample;
[0063] Take out the measured sample, and clean and inspect the loading ring 3, the limiting base 1 and the buffer assembly to ensure the repeatability and accuracy of subsequent use.
[0064] The application simulates an equivalent electromagnetic stress field under normal temperature or deep low temperature experimental conditions by pure mechanical loading, meets the demand of stress loading experiment of flexible sensitive elements such as optical fiber sensors, and is convenient for in-depth study of mechanical response and reliability of optical fiber sensing materials under electromagnetic force equivalent working conditions, and further provides experimental verification basis for engineering design and safe operation of superconducting devices and optical fiber sensing systems.
[0065] The technical solutions of the application are fully described above, and it should be noted that the specific embodiments of the application are not limited by the above description, and all technical solutions formed by equivalent transformation or equivalent transformation in structure, method or function according to the spirit and essence of the application fall within the protection scope of the application.
Claims
1. An adjustable radius loading device for loading equivalent electromagnetic stress, characterized in that: include: Limit base; A loading ring with an adjustable radius, the loading ring being connected to the limit base with an adjustable height to adapt to different liquid nitrogen level requirements; The loading ring can change the diameter of the annular load to adjust the magnitude of the annular stress applied to the component to be measured; the limiting base is used to fix the component to be measured and provide support for the loading ring.
2. The adjustable radius loading device for loading equivalent electromagnetic stress according to claim 1, characterized in that: The invention also includes a slidable bearing base connected to the loading ring. The slidable bearing base can expand or reduce the annular diameter of the loading ring by rotating the slidable bearing base.
3. The adjustable radius loading device for loading equivalent electromagnetic stress according to claim 1, characterized in that: It also includes at least three adjustable height studs, which are arranged in a ring array. The limit base is provided with through holes corresponding to the at least three adjustable height studs, and the loading ring is provided with threaded holes corresponding to the at least three through holes. The adjustable height studs pass through the corresponding through holes and cooperate with the threaded holes to adjust the height according to experimental needs and adapt to different liquid nitrogen liquid level requirements.
4. The adjustable radius loading device for loading equivalent electromagnetic stress according to claim 1, characterized in that: The loading ring is composed of a segmented annular loading structure and is made of a material with a low thermal expansion coefficient to minimize the impact of temperature on the size of the workpiece.
5. An experimental method for applying an adjustable radius load to an equivalent electromagnetic stress, characterized in that: Using the adjustable radius loading device for loading equivalent electromagnetic stress according to any one of claims 1 to 4, the experimental method comprises the following steps: S10. Experimental Preparation Select the appropriate type of adjustable radius loading ring and limit base according to the size and shape of the optical fiber or superconducting coil to be tested; S20, sample fixation Place the fiber to be tested in the positioning groove of the loading ring, adjust its position relative to the center of the loading ring, ensure that the sample is uniform in circumference, without tilt or looseness, and use an appropriate flexible clamp or low-temperature glue to preliminarily fix it; S30, loading ring pre-adjustment Placed in a room temperature and liquid nitrogen environment, the radius expansion size and angle of the loading ring are calibrated and calculated to ensure the accuracy of the experimental data; S40, apply equivalent hoop stress The sliding bearing base is slowly rotated to gradually expand the loading ring in the radial direction and gradually and uniformly adjusted to the desired target radius, thereby applying the expected equivalent electromagnetic hoop stress to the sample; S50, Loading, Holding and Data Acquisition When the loading ring reaches the target radius, it maintains a stable loading state, during which the optical fiber performance parameters can be collected and recorded. For experiments under deep cryogenic conditions, after completing the initial loading at room temperature, the entire device can be slowly placed in a liquid nitrogen tank. After the temperature stabilizes, a secondary loading fine-tuning calibration is performed to ensure that the stress simulation at low temperature is consistent with the actual working conditions. S60, uninstall and reset After the experiment, the driving adjustment mechanism of the sliding bearing base is slowly rotated in the opposite direction to gradually increase the radius of the loading ring until it is completely separated from the sample; Remove the sample to be tested, and clean and inspect the loading ring, limit base and buffer assembly to ensure repeatability and accuracy in subsequent use.