Stiffness variable elastic support device and control method

Abstract

The application discloses a variable stiffness elastic supporting device and a control method. The elastic supporting device is used for a rotor shaft of an engine, and comprises a cage member, a moving member and an electromagnetic member. The cage member is used for connecting the rotor shaft of the engine, and comprises a plurality of cage bars which are arranged at intervals along a circumferential direction of the cage member. The moving member is movable relative to the cage member along a radial direction of the cage member. The electromagnetic member corresponds to the moving member along the radial direction. The electromagnetic member drives the moving member to be movable relative to the cage member between a first position and a second position. The moving member at the first position is located between adjacent cage bars and is in close contact with the cage member. The moving member at the second position is spaced apart from the cage member. According to the elastic supporting device, the moving member is located at different positions respectively, so that the supporting stiffness of the elastic supporting device is changed, the critical rotating speed of the rotor shaft is avoided, and the vibration peak is reduced.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and more particularly to a variable stiffness elastic support device and control method. Background Technology

[0002] Aircraft include engines, which drive impellers to rotate. During operation, engine operation generates vibrations. Excessive engine vibration can affect the safe and reliable operation of the aircraft.

[0003] Therefore, in view of the above situation, there is a need to provide a variable stiffness elastic support device and control method to at least partially solve the existing problems. Summary of the Invention

[0004] The summary of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] According to a first aspect of this application, a variable stiffness elastic support device is provided, the elastic support device comprising:

[0006] A cage component for connecting the rotor shaft of an engine, the cage component comprising a plurality of cage bars spaced apart along the circumferential direction of the cage component;

[0007] A movable component, which is movable relative to the cage component in the radial direction of the cage component;

[0008] An electromagnetic component, corresponding to the movable component along the radial direction, drives the movable component to move relative to the cage component between a first position and a second position.

[0009] The movable member located at the first position is situated between adjacent cage bars and is in contact with the cage member.

[0010] The movable member located in the second position is spaced apart from the cage member.

[0011] According to the variable stiffness elastic support device of this application, the elastic support device includes a cage member, a moving member, and an electromagnetic member. The cage member is used to connect the rotor shaft of the engine. The cage member includes multiple cage bars, which are spaced apart along the circumferential direction of the cage member. The moving member is movable relative to the cage member in the radial direction. The electromagnetic member corresponds to the moving member in the radial direction and drives the moving member to move between a first position and a second position relative to the cage member. The moving member in the first position is located between adjacent cage bars and is in contact with the cage member. The moving member in the second position is spaced apart from the cage member. In this way, the moving member is located in different positions, which changes the support stiffness of the elastic support device. It can match rotor shafts with different speeds, avoid the critical speed of the rotor shaft, effectively suppress the peak vibration of the rotor shaft within the operating speed range of the rotor shaft, improve the rotor dynamic characteristics, reduce vibration, and reduce the vibration peak value. The moving member is driven by the electromagnetic member, which has high adjustment accuracy, fast response speed, and is reliable and durable.

[0012] Optionally, the cage component further includes a base and an outer edge. The base is connected to one end of the cage bar along the axial direction of the cage component, and the outer edge is connected to the other end of the cage bar along the axial direction. The movable member located at the first position is in contact with the base, and the movable member located at the first position is in contact with the outer edge.

[0013] Optionally, the movable component includes a main body portion that is fitted to the cage bars, the main body portion that is fitted to the base portion, and the main body portion that is fitted to the outer edge portion.

[0014] Optionally, the movable member further includes a protrusion that protrudes from the end of the main body, and the outer edge includes a notch in which the protrusion is located.

[0015] Optionally, the elastic support device further includes a plurality of electromagnetic components, which are spaced apart along the circumferential direction of the cage component.

[0016] Optionally, the elastic support device further includes a first moving member and a second moving member, the first moving member and the second moving member being located on both sides of the cage member in the radial direction, and the same electromagnetic member being able to drive both the first moving member and the second moving member to move.

[0017] Optionally, the electromagnetic component is located inside the cage component, and the electromagnetic component is energized to cause the moving component located in the second position to move toward the electromagnetic component to the first position.

[0018] Optionally, the elastic support device includes a fixing member, the fixing member including a receiving chamber that receives the cage member.

[0019] Optionally, the elastic support device further includes a guide member connected to the movable member. The fixed member is provided with a through hole, and the guide member is inserted into the through hole. The guide member is movable relative to the through hole in the radial direction to guide the movable member to move in the radial direction.

[0020] Optionally, the elastic support device further includes an elastic member, one end of which abuts against the guide member in the radial direction, and the other end of which abuts against the fixed member in the radial direction. The elastic member is capable of elastic deformation in the radial direction so that the moving member located in the first position moves to the second position.

[0021] This application also provides a control method employing the aforementioned elastic support device, wherein the elastic support device is used for the rotor shaft of an engine, and the cage member is connected to the rotor shaft. The control method includes:

[0022] When the rotor shaft rotates at a first speed, the electromagnetic component is energized so that the movable component located at the second position moves to the first position, and the movable component located at the first position is in contact with the cage component;

[0023] When the rotor shaft rotates at a second speed, the electromagnetic component is de-energized so that the moving component located at the first position moves to the second position. The moving component located at the second position is spaced apart from the cage component, and the first speed is less than the second speed.

[0024] According to the control method of this application, the control method employs the aforementioned elastic support device, which is used for the rotor shaft of the engine. The cage component is connected to the rotor shaft. The control method includes: when the rotor shaft rotates at a first speed, the electromagnetic component is energized to move a movable component located at a second position to the first position, where the movable component at the first position is in contact with the cage component; when the rotor shaft rotates at a second speed, the electromagnetic component is de-energized to move the movable component at the first position to the second position, where the movable component at the second position is spaced apart from the cage component, and the first speed is less than the second speed. In this way, the movable component being located at different positions changes the support stiffness of the elastic support device, enabling it to match rotor shafts at different speeds, avoiding the critical speed of the rotor shaft, effectively suppressing peak vibration of the rotor shaft within its operating speed range, improving rotor dynamic characteristics, reducing vibration, and lowering vibration peak values. The movement of the movable component is driven by the electromagnetic component, resulting in high adjustment accuracy, fast response speed, and reliable durability. Attached Figure Description

[0025] The following figures are included as part of this application for understanding the application. The figures illustrate embodiments of the application and their descriptions, explaining the apparatus and principles of the application. In the figures,

[0026] Figure 1 This is an exploded view of an elastic support device according to a preferred embodiment of this application;

[0027] Figure 2 for Figure 1 A three-dimensional schematic diagram of the cage components shown;

[0028] Figure 3 for Figure 1 A three-dimensional schematic diagram of the movable component shown;

[0029] Figure 4 for Figure 1 A partial cross-sectional schematic diagram of the elastic support device shown;

[0030] Figure 5 for Figure 3 A partial schematic diagram of the elastic support device is shown, in which the movable component is located in the first position;

[0031] Figure 6 for Figure 3 A partial schematic diagram of the elastic support device is shown, in which the movable component is located in the second position;

[0032] Figure 7 for Figure 3 A schematic diagram of the static stiffness test of the elastic support device shown.

[0033] Figure 8 This is a graph showing the variation in the support stiffness of the engine's rotor shaft.

[0034] Figure 9 for Figure 5 The load-displacement curve of the elastic support device is shown below;

[0035] Figure 10 for Figure 4 The load-displacement curve of the elastic support device is shown.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100: Elastic support device; 110: Cage component

[0038] 111: Cage bars 112: Space

[0039] 113: Base 114: Outer edge

[0040] 115: Gap 130: Moving component

[0041] 131: Main body 132: Protruding part

[0042] 133: Reset hole; 134: Mating component

[0043] 150: Electromagnetic component; 160: Fixed component

[0044] 161: Receiving chamber; 162: Fastening component

[0045] 170: Elastic member; 171: One end of the elastic member

[0046] 172: The other end of the elastic member; 173: The guide member.

[0047] 200: Bench; 201: Eddy current displacement sensor

[0048] 202: First weight 203: Second weight

[0049] 204: Rotor shaft Detailed Implementation

[0050] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0051] To fully understand this application, detailed descriptions will be provided below to illustrate it. Obviously, implementation of this application is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this application are described in detail below; however, other embodiments may exist besides these detailed descriptions and should not be construed as being limited to the embodiments set forth herein.

[0052] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the scope of this application. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms “upper,” “lower,” “front,” “rear,” “left,” “right,” and similar expressions used in this application are for illustrative purposes only and are not intended to be limiting.

[0053] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning, such as a specific order. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] The specific embodiments of this application will be described in more detail below with reference to the accompanying drawings, which illustrate representative embodiments of this application and are not intended to limit this application.

[0055] Figure 1 This application illustrates a preferred embodiment of an elastic support device 100 for an engine rotor shaft 204 (rotor shaft 204 in...). Figure 7 (As shown in the figure). The stiffness of the elastic support device 100 is variable. The rotor shaft 204 rotates to generate vibration. The elastic support device 100 is capable of bearing the vibration output by the rotor shaft 204. The variable stiffness elastic support device 100 can be matched to the rotor shaft 204 at different speeds, thereby reducing the vibration of the rotor shaft 204 at different speeds.

[0056] Specifically, the elastic support device 100 includes a cage member 110 for connecting the rotor shaft 204 of the engine. The cage member 110 can be constructed as a squirrel cage structure. The cage member 110 is a hollow cylindrical structure. The cage member 110 includes a plurality of cage bars 111, which are spaced apart along the circumferential direction of the cage member 110. The cage member 110 has a rotor hole through which the rotor shaft 204 extends. The rotor hole supports the rotor shaft 204 to bear the vibrations transmitted from the rotor shaft 204 to the cage member 110. The rotor shaft 204 passes through the rotor hole via bearings. The axial direction D1 of the cage member 110 is parallel to the axial direction of the rotor shaft 204. The radial direction D2 of the cage member 110 is parallel to the radial direction of the rotor shaft 204. The length direction of the cage bars 111 is parallel to the axial direction D1 of the cage member 110. A space 112 is formed between adjacent cage bars 111.

[0057] The elastic support device 100 also includes a movable member 130 and an electromagnetic member 150, which correspond to each other along the radial direction D2 of the cage member 110. The movable member 130 is movable relative to the cage member 110 along the radial direction D2 of the cage member 110. The movable member 130 is made of a magnetically conductive material, and the electromagnetic member 150 is constructed as an electromagnet. When energized, the electromagnetic member 150 generates a magnetic field, and the magnetic force can drive the movable member 130 to move. The elastic support device 100 also includes a fastening member 162 for fixing the electromagnetic member 150. The fastening member 162 fixes the electromagnetic member 150 by bolts.

[0058] When the electromagnetic component 150 is energized, it can drive the movable component 130 to move toward the interior of the cage component 110. The electromagnetic component 150 drives the movable component 130 to move between a first position and a second position relative to the cage component 110. The movable component 130 is located in different positions, so that the elastic support device 100 has different stiffnesses to adapt to different rotational speeds of the rotor shaft 204, thus having a wide range of applications. Therefore, by moving the movable component 130 to different positions, the stiffness of the elastic support device 100 along the axial direction D1 of the cage component 110 can be changed.

[0059] like Figure 5 As shown, the movable member 130 in the first position is located within the cage member 110. The movable member 130 in the first position is located inside the cage member 110. Specifically, the movable member 130 in the first position is located between adjacent cage bars 111. The movable member 130 in the first position is located in the space 112. The movable member 130 in the first position is capable of filling the space 112 between adjacent cage bars 111.

[0060] The movable member 130 in the first position is in contact with the cage member 110. The edges of the movable member 130 in the first position are in contact with the cage member 110. Therefore, the movable member 130 in the first position enhances the stiffness of the elastic support device 100 along the axial direction D1 of the cage member 110. The combination of the movable member 130 in the first position and the cage member 110 improves the overall stiffness, thereby adapting to the rotor shaft 204 at the first rotational speed. The stiffness of the cage member 110 itself is k1, and the stiffness of the movable member 130 in the first position combined with the cage member 110 is k2, where k2 > k1. The stiffness of the movable member 130 in the first position along the axial direction D1 of the cage member 110 is superimposed on the stiffness of the cage member 110. Therefore, the stiffness of the movable member 130 in the first position combined with the cage member 110 along the axial direction D1 of the cage member 110 is improved.

[0061] like Figure 6As shown, the movable member 130 in the second position is spaced apart from the cage member 110. When the electromagnetic member 150 is de-energized, the movable member 130 in the first position moves to the second position. The movable member 130 in the first position is located inside the cage member 110. The movable member 130 in the second position is located outside the cage member 110. The movable member 130 in the second position does not contact the cage member 110, thus adapting to the rotor shaft 204 at the second rotational speed.

[0062] For example, such as Figure 8 As shown, when the moving member 130 is in the first position, the curve corresponding to the peak value of the imbalance of the elastic support device 100 is the S1 curve. The peak value of the S1 curve is located between 5000 r / min and 6000 r / min when the rotational speed of the rotor shaft 204 is less than 5000 r / min. When the first rotational speed of the rotor shaft 204 is less than 5000 r / min, the S1 curve is relatively flat. That is, when the first rotational speed of the rotor shaft 204 is less than 5000 r / min, the moving member 130 is in the first position. The moving member 130 in the first position and the cage member 110 combine to enable the elastic support device 100 to smoothly support the rotation of the rotor shaft 204 with less vibration.

[0063] When the moving member 130 is in the second position, the curve representing the peak value of the imbalance of the elastic support device 100 is the S2 curve. The peak value of the S2 curve is located between 4000 r / min and 5000 r / min when the rotational speed of the rotor shaft 204 is greater than 5000 r / min. When the rotational speed of the rotor shaft 204 is greater than 5000 r / min, the S2 curve is relatively flat. That is, when the second rotational speed of the rotor shaft 204 is greater than 5000 r / min, the moving member 130 is in the second position. The moving member 130 in the second position is separated from the cage member 110, so that the elastic support device 100 can smoothly support the rotation of the rotor shaft 204 with less vibration.

[0064] Specifically, when the first rotational speed of the rotor shaft 204 is between 0 and 5000 r / min, the electromagnetic component 150 is energized to drive the moving component 130 to move to the first position. The moving component 130 and the cage component 110 are in contact at the first position to minimize vibration. When the second rotational speed of the rotor shaft 204 is greater than 5000 r / min, the electromagnetic component 150 is de-energized to drive the moving component 130 to move to the second position. The moving component 130 and the cage component 110 are separated at the second position to minimize vibration.

[0065] In a preferred embodiment, the electromagnetic component 150 is located inside the cage component 110. The electromagnetic component 150 is energized to drive the moving component 130 to move. The electromagnetic component 150 is capable of driving the moving component 130, located in a second position, to move toward the electromagnetic component 150. The electromagnetic component 150 is also capable of driving the moving component 130, located in the second position, to move along the radial direction D2 of the cage component 110 toward the interior of the cage component 110.

[0066] In another optional embodiment, the movable member 130 in the second position is located inside the cage member 110 along the radial direction D2. The electromagnetic member 150 is located outside the cage member 110 along the radial direction D2. When the electromagnetic member 150 is energized, it can drive the movable member 130 to move towards the outside of the cage member 110. The electromagnetic member 150 is energized to drive the movable member 130 to move. The electromagnetic member 150 can drive the movable member 130 in the second position to move towards the electromagnetic member 150. The electromagnetic member 150 can drive the movable member 130 in the second position to move towards the outside of the cage member 110 along the radial direction D2.

[0067] According to the present application, a variable stiffness elastic support device 100 is used for a rotor shaft 204 of an engine. The elastic support device 100 includes a cage member 110, a moving member 130, and an electromagnetic member 150. The cage member 110 is used to connect the rotor shaft 204 of the engine. The cage member 110 includes a plurality of cage bars 111, which are spaced apart along the circumferential direction of the cage member 110. The moving member 130 is movable relative to the cage member 110 along the radial direction D2. The electromagnetic member 150 corresponds to the moving member 130 in the radial direction and drives the moving member 130 to move relative to the cage member 110 between a first position and a second position. The moving member 130 in the first position is located between adjacent cage bars 111 and is in contact with the cage member 110. The moving member 130 in the second position is spaced apart from the cage member 110. In this way, the moving component 130 is located in different positions, which changes the support stiffness of the elastic support device 100. It can match the rotor shaft 204 at different speeds, avoid the critical speed of the rotor shaft 204, effectively suppress the peak vibration of the rotor shaft 204 within the working speed range of the rotor shaft 204, improve the rotor dynamic characteristics, reduce vibration, and reduce the vibration peak value. The moving component 130 is driven to move by the electromagnetic component 150, which has high adjustment accuracy, fast response speed, and is reliable and durable.

[0068] Furthermore, such as Figure 2As shown, the cage member 110 further includes a base 113 and an outer edge 114, both of which are connected to the cage bars 111. The base 113 is connected to one end of the cage bar 111 along the axial direction D1 of the cage member 110. Preferably, the base 113 and the cage bar 111 can be integrally formed. The base 113 includes the aforementioned rotor hole for connection with the rotor shaft 204. The rotor shaft 204 is rotatable relative to the base 113. A movable member 130 located in a first position is in contact with the base 113. The movable member 130 located in the first position is situated to the side of the base 113 along the axial direction D1 of the cage member 110. One end of the movable member 130 located in the first position along the axial direction D1 of the cage member 110 is in contact with the base 113. The base 113 and the cage bars 111 are vertically connected, making the edges of the space 112 neat, which facilitates processing and reduces the difficulty of fitting the moving component 130 to the cage bars 111 and the moving component 130 to the base 113.

[0069] The base 113 includes a ring and an extension, which are perpendicularly connected. The ring has the rotor hole described above. The extension extends from the edge of the ring toward the cage bars 111. The extension extends along the axial direction D1 of the cage member 110. The extension is connected to the cage bars 111. Preferably, the extension and the cage bars 111 are integrally formed. A plurality of cage bars 111 are connected to the extension. The plurality of cage bars 111 are spaced apart along the circumferential direction of the cage member 110. A movable member 130 located in a first position is in contact with the extension. The movable member 130 located in the first position is located to the side of the extension along the axial direction D1 of the cage member 110. One end of the movable member 130 located in the first position along the axial direction D1 of the cage member 110 is in contact with the extension.

[0070] The outer edge 114 is connected to the other end of the cage bar 111 along the axial direction D1 of the cage member 110. Preferably, the outer edge 114 and the cage bar 111 can be integrally formed. The fastening member 162 is connected to the outer edge 114. The cage member 110 also includes a flange 116, which is connected to the outer edge 114. The flange 116 and the outer edge 114 are connected together by welding. The flange 116 is arranged around a plurality of cage bars 111 along the circumferential direction of the cage member 110. The flange 116 is connected to the fastening member 162 by a connector. This fixes the cage member 110. The moving member 130 located in the first position is in contact with the outer edge 114. The moving member 130 located in the first position is located to the side of the outer edge 114 along the axial direction D1 of the cage member 110. The other end of the movable member 130 located in the first position along the axial direction D1 of the cage member 110 is in contact with the outer edge 114. The outer edge 114 and the cage bars 111 are vertically connected, making the edge of the space 112 neat, which facilitates processing and reduces the difficulty of contacting the movable member 130 with the cage bars 111 and the outer edge 114.

[0071] The movable member 130, located in the first position, is situated between the outer edge 114 and the base 113 to enhance the stiffness between the outer edge 114 and the base 113. Thus, by adjusting the controllable stiffness of the elastic support device 100 along the axial direction D1 of the cage member 110, the critical speed of the rotor shaft 204 can be adjusted, the vibration peak value of the rotor shaft 204 can be reduced, and active vibration control of the rotor shaft 204 can be achieved.

[0072] like Figure 3 As shown, the moving member 130 is constructed as a wedge-shaped block. The electromagnetic member 150 is constructed as a square electromagnet. The shape of the electromagnetic member 150 matches the shape of the moving member 130. The moving member 130 includes a main body 131, which is attached to the cage bars 111. The main body 131 is constructed as a cuboid structure. This facilitates processing and provides good rigidity. The main body 131 includes a first surface and a second surface, which face opposite directions. The first surface faces one cage bar 111. The first surface is attached to one cage bar 111 along the circumferential direction of the cage member 110. In particular, the first surface is attached to the surface of one cage bar 111 facing the main body 131. The second surface faces another cage bar 111. The second surface is attached to another cage bar 111 along the circumferential direction of the cage member 110. In particular, the second surface is attached to the surface of another cage bar 111 facing the main body 131.

[0073] The main body 131 is also in contact with the base 113. The main body 131 also includes a third surface and a fourth surface, which face opposite directions along the axial direction D1 of the cage member 110. The third surface faces the base 113. The third surface is in contact with the base 113 along the axial direction D1 of the cage member 110. The third surface is in contact with the surface of the base 113 facing the main body 131 along the axial direction D1 of the cage member 110. The fourth surface faces the outer edge 114. The fourth surface is in contact with the outer edge 114 along the axial direction D1 of the cage member 110. The fourth surface is in contact with the surface of the outer edge 114 facing the main body 131 along the axial direction D1 of the cage member 110.

[0074] Thus, the main body 131 is fitted with the adjacent cage bars 111 along the circumferential direction of the cage member 110, the main body 131 is fitted with the base 113 along the axial direction D1 of the cage member 110, and the main body 131 is fitted with the outer edge 114 along the axial direction D1 of the cage member 110. The main body 131 can fill the entire space 112 between adjacent cage bars 111, compensate for the stiffness of the cage member 110, and in particular compensate for the stiffness of the hollow space 112 between adjacent cage bars 111, thereby enhancing the structural strength of the cage member 110 and giving the elastic support device 100 good stiffness.

[0075] Combination Figure 2 As shown, the outer edge 114 includes a notch 115, which is recessed in a direction away from the base 113. The moving member 130 also includes a protrusion 132, which protrudes from the end of the main body 131. The protrusion 132 protrudes along the axial direction D1 of the cage member 110. The protrusion 132 is located in the notch 115 and fits against the edge of the notch 115. Thus, the protrusion 132 can compensate for the stiffness of the notch 115 and improve the structural strength of the cage member 110.

[0076] like Figure 1 As shown, the elastic support device 100 also includes a plurality of electromagnetic components 150, which are spaced apart along the circumferential direction of the cage component 110. As an optional embodiment, the number of movable components 130 can be one, with one movable component 130 corresponding to one of the plurality of electromagnetic components 150. When the plurality of electromagnetic components 150 are energized, the magnetic field force generated by the plurality of electromagnetic components 150 acts on one movable component 130. This results in a stronger magnetic field force, enabling rapid adsorption of the movable component 130 and improving efficiency.

[0077] In another alternative embodiment, the cage member 110 includes a plurality of cage bars 111, each cage bar 111 forming a plurality of spaces 112. The elastic support device 100 includes a plurality of movable members 130, which are spaced apart along the circumferential direction of the cage member 110. Each of the movable members 130 corresponds to a plurality of electromagnetic members 150. The movable members 130 and electromagnetic members 150 correspond respectively along the radial direction D2 of the cage member 110. The electromagnetic members 150 are energized, so that corresponding magnetic forces act on the movable members 130, thereby causing the movable members 130 to move. The movable members 130 can move into the plurality of spaces 112 respectively. Thus, the movable members 130 can compensate for the stiffness of the plurality of spaces 112, and the overall structural strength of the elastic support device 100 can be improved.

[0078] Optionally, the same electromagnetic component 150 can simultaneously drive two moving components 130 to move. The elastic support device 100 also includes a first moving component and a second moving component, which are located on opposite sides of the cage component 110 along the radial direction D2. The first and second moving components are symmetrically arranged along the radial direction D2 of the cage component 110. The first and second moving components move in opposite directions. The same electromagnetic component 150 can drive both the first and second moving components to move. When the same electromagnetic component 150 is energized, the first and second moving components move in opposite directions. The first moving component moves towards the second moving component along the radial direction D2 of the cage component 110, such that the first moving component at the first position is located in the space 112 between two adjacent cage bars 111. The second moving component moves towards the first moving component along the radial direction D2 of the cage component 110, such that the second moving component at the first position is located in the space 112 between two other adjacent cage bars 111. This reduces the number of electromagnetic components 150, lowers cost and weight, and improves efficiency.

[0079] The elastic support device 100 also includes a fixing member 160 for fixing the cage member 110. The fixing member 160 is constructed as a hollow cylindrical structure. The axial direction of the fixing member 160 is parallel to the axial direction D1 of the cage member 110. The fixing member 160 includes a receiving chamber 161 that receives the cage member 110. The flange 116 of the cage member 110 is connected to the fixing member 160. The flange 116 of the cage member 110 is connected to the fixing member 160 by a fastening member 162. The flange 116 of the cage member 110 is located between the fastening member 162 and the fixing member 160. The flange 116 of the cage member 110, the fastening member 162, and the fixing member 160 are connected together by a connector. The cage member 110 and the fixing member 160 are relatively stationary. The rotor shaft 204 rotates relative to the fixing member 160.

[0080] The elastic support device 100 also includes a guide member 173 and a mating member 134, with the mating member 134 disposed on the movable member 130. The guide member 173 and the mating member 134 are connected together. The guide member 173 can be constructed as a column, and the mating member 134 can be constructed as a hole. The guide member 173 is inserted into the mating member 134 on the movable member 130 and fixed together by a threaded connection. The fixed member 160 is provided with a through hole, the axial direction of which is parallel to the radial direction of the cage member 110. The guide member 173 is inserted into the through hole. The guide member 173 is movable relative to the through hole along the radial direction D2 of the cage member 110, thereby guiding the movable member 130 to move linearly along the radial direction D2 of the cage member 110. Thus, the guide member 173 can guide the movable member 130, preventing the movable member 130 from deviating and thus preventing the movable member 130 from failing to move into position between adjacent cage bars 111.

[0081] To facilitate the repositioning of the movable component 130, combined with Figure 4 As shown, the elastic support device 100 also includes an elastic member 170, which connects the fixed member 160 and the movable member 130. The elastic member 170 is constructed as a disc spring. The elastic member 170 is capable of elastic deformation along the radial direction D2 of the cage member 110. The elastic member 170 is capable of driving the movable member 130, which is located in the first position, to move to the second position.

[0082] like Figure 5 and Figure 6 As shown, one end 171 of the elastic member 170 along the radial direction D2 of the cage member 110 abuts against the guide member 173. One end 171 of the elastic member 170 abuts against the nut of the guide member 173. The movement of the moving member 130 drives the guide member 173 to move, and the movement of the guide member 173 compresses the elastic member 179, so that the elastic member 170 deforms.

[0083] The other end 172 of the elastic member 170 along the cage member 110 abuts against the fixed member 160. In this way, the fixed member 160 constrains the other end 172 of the elastic member 170.

[0084] The electromagnetic component 150 generates a magnetic field when energized, driving the movable component 130 to move. For example, the electromagnetic component 150 can attract the movable component 130. The electromagnetic component 150 can drive the movable component 130, located in the second position, to move along the radial direction D2 of the cage component 110 toward the interior of the cage component 110 to the first position. The movement of the movable component 130 causes the guide component 173 to move, resulting in elastic deformation of the elastic component 170. When the electromagnetic component 150 is de-energized, it does not generate a magnetic field force, thus not driving the movable component 130 to move. The elastic component 170 can generate elastic deformation along the radial direction D2 of the cage component 110, and the elastic component 170 applies an elastic force to the guide component 173 in a direction away from the electromagnetic component 150, causing the movable component 130, located in the first position, to move to the second position. Thus, the elastic component 170 can reset the movable component 130, and the reset of the movable component 130 is controlled by mechanical means, resulting in high reliability.

[0085] The control system controls the rotation of the rotor shaft 204. The control system includes a speed acquisition component, an A / D conversion system, a computer, a power amplifier, and a programmable DC power supply. The speed acquisition component is constructed as an eddy current displacement sensor 201, located to the side of the elastic support device 100, to measure the vibration displacement of the elastic support device 100. The programmable DC power supply provides power to the electromagnetic component 150, enabling or de-energizing it. The A / D conversion system includes an analog-to-digital converter.

[0086] When the eddy current displacement sensor 201 detects that the rotor shaft 204's rotational speed is close to the critical speed (i.e., the rotor shaft 204's rotational speed is close to 5000 r / min), it transmits a signal to the computer via the A / D conversion system. The computer sends a power-on command to the programmable DC power supply via the analog-to-digital converter and power amplifier, driving the programmable DC power supply to provide the electromagnetic component 150 with appropriate current and voltage. After the electromagnetic component 150 is energized, it attracts the moving component 130 to move along the radial direction D2 of the cage component 110. Under the action of the electromagnetic force, the moving component 130 moves to a first position to make close contact with the cage bars 111. The computer sends a power-off command to the programmable DC power supply via the analog-to-digital converter and power amplifier, driving the programmable DC power supply to de-energize. After the electromagnetic component 150 is de-energized, under the action of the elastic component 170, the moving component 130 moves in the opposite direction along the radial direction D2 of the cage component 110. The moving component 130 moves to a second position to be spaced apart from the cage component 110.

[0087] In this way, the support stiffness is changed by adjusting the contact and separation between the moving component 130 and the cage bars 111. Figure 8 As shown by curve S1, when the moving component 130 is in contact with the cage bars 111 under the action of electromagnetic force, the support stiffness of the elastic support device 100 is 1.17E7 N / m. Figure 8 As shown by the S2 curve, when the moving member 130 disengages from the cage bars 111, the support stiffness of the elastic support device 100 is 7.97E6 N / m. When the support stiffness of this application varies between 7.97E6 N / m and 1.17E7 N / m, the peak vibration value at critical locations of the rotor is reduced by 51.45%.

[0088] To quantify and verify the effect of moving components located at different positions on the stiffness change of the entire elastic support device, such as Figure 7 As shown, the elastic support device 100 is mounted on the test bench 200 to form a static stiffness characteristic test bench. The test bench 200 supports the elastic support device 100. The rotor shaft 204 is connected to the elastic support device 100. The rotor shaft 204 protrudes from the elastic support device 100 along the axial direction D1 of the cage member 110. The elastic support device 100 is located at the middle of the rotor shaft 204. Weights are suspended at both ends of the rotor shaft 204 along the axial direction. A first weight 202 is suspended at one end of the rotor shaft 204 along the axial direction, and a second weight 203 is suspended at the other end of the rotor shaft 204 along the axial direction. The first weight 202 and the second weight 203 are symmetrically arranged.

[0089] An eddy current displacement sensor 201 is also provided on the side of the elastic support device 100. The eddy current displacement sensor 201 is used to detect the deformation range of the elastic support device 100. The eddy current displacement sensor 201 is fixed in the installation position to eliminate the influence of the installation position on the test results. The rotor shaft 204 rotates at different speeds, and the eddy current displacement sensor 201 can measure the different deformation ranges of the elastic support device 100 respectively.

[0090] Figure 9 A load-displacement curve is shown, wherein the electromagnetic component 150 is de-energized and the moving component 130 is in the second position. The horizontal axis shows the displacement of the elastic support device 100, and the vertical axis shows the load of two weights applied to the rotor shaft 204. The load refers to the total weight of the first weight 202 and the second weight 203. The load-displacement curve of the controllable stiffness elastic support device 100 is thus derived. The slope of the displacement-load curve represents the static stiffness of the elastic support device 100.

[0091] The first weight 202 is loaded multiple times. The second weight 203 is loaded multiple times. It is understandable that the first weight 202 and the second weight 203 are simultaneously subjected to the same load. Figure 9 In the diagram, different colored lines indicate different load conditions. The eddy current displacement sensor 201 detects different displacements of the elastic support device 100.

[0092] Figure 10 Another load-displacement curve is shown, in which the electromagnetic component 150 is energized and the moving component 130 is in the first position. The horizontal axis shows the displacement of the elastic support device 100, and the vertical axis shows the loads of two weights applied to the rotor shaft 204. The first weight 202 is loaded multiple times. The second weight 203 is loaded multiple times. It is understood that the first weight 202 and the second weight 203 are simultaneously subjected to the same weight of load. Figure 10 In the diagram, different colored lines indicate different load conditions. The eddy current displacement sensor 201 detects different displacements of the elastic support device 100.

[0093] A speed sensor is installed on the rotor shaft 204 to monitor its rotational speed. When the rotor shaft 204 rotates, the rotor speed detected by the speed sensor is transmitted to an analog-to-digital converter (ADC) via a speed signal, and then transmitted to a computer. When the speed sensor detects that the rotor speed is approaching a critical speed, the computer sends a command to the programmable DC power supply via a power amplifier, and the programmable DC power supply begins to supply DC power to the electromagnet. After the electromagnet is energized, the attraction moving member 130 moves downward along the radial direction D2 of the cage member 110, thereby making close contact with the cage bars 111 and changing the support stiffness. The formula for the stiffness change of the elastic support device 100 is:

[0094]

[0095] In the above formula, n is the number of cage bars 111, E is the Young's modulus of the cage bar 111 material, b is the width of the cage bar 111, h is the height of the cage bar 111, and L is the effective length of the cage bar 111. When the moving component 130 is not in contact with the cage bars 111, the effective length of the cage bars 111 is 85.6 mm, and the stiffness of the elastic support structure is 4.5E6 N / m.

[0096] When the electromagnet is energized, the moving member 130 moves to a first position along the radial direction D2 of the cage member 110. At the first position, the moving member 130 makes close contact with the cage bars 111, and the overall structural stiffness of the elastic support device 100 is 2.25E6 N / m. This increases the stiffness of the elastic support device 100, leading to an increase in the critical speed of the rotor shaft 204, thereby effectively reducing the resonance peak value.

[0097] As the rotational speed of rotor shaft 204 continues to increase, the speed sensor detects that the rotor speed is approaching the critical speed for high stiffness and transmits the speed signal to the computer via an analog-to-digital converter. The computer sends a command to the DC power supply via a power amplifier, and the DC power supply stops supplying power. The electromagnet is de-energized, its magnetism disappears, and the moving member 130 moves to the second position along the radial direction D2 of the cage member 110 under the action of the elastic member 170. The moving member 130 in the second position is spaced apart from the cage member 110. In this way, the stiffness of the elastic support device 100 decreases, and the critical speed of rotor shaft 204 decreases accordingly, thus avoiding the rotational speed of rotor shaft 204 at this time and effectively suppressing the peak vibration of rotor shaft 204.

[0098] This application also provides a control method employing the aforementioned elastic support device 100. The elastic support device 100 is used for the rotor shaft 204 of the engine. The cage member 110 is connected to the rotor shaft 204.

[0099] Control methods include:

[0100] When the rotor shaft 204 rotates at a first speed, the electromagnetic component 150 is energized, causing the movable component 130, located in the second position, to move to the first position. The movable component 130 in the first position is in contact with the cage component 110. The first speed is less than 5000 r / min. The imbalance response curve measured by the elastic support device 100 when the movable component 130 is in the first position is the S1 curve. Thus, the movable component 130 in the first position ensures that the rotor shaft 204 rotating at the first speed experiences less vibration.

[0101] When the rotor shaft 204 rotates at a second speed, the electromagnetic component 150 is de-energized, causing the movable component 130, located in the first position, to move to the second position. The movable component 130 in the second position is spaced apart from the cage component 110. The second speed is greater than 5000 r / min. The imbalance response curve measured by the elastic support device 100 when the movable component 130 is in the first position is an S2 curve. Thus, the movable component 130 in the second position enables the rotor shaft 204 rotating at the second speed to vibrate less.

[0102] According to the control method of this application, the control method employs the aforementioned elastic support device 100. The elastic support device 100 is used for the rotor shaft 204 of the engine. The cage member 110 is connected to the rotor shaft 204. The control method includes: when the rotor shaft 204 rotates at a first speed, the electromagnetic member 150 is energized to move the movable member 130 located at the second position to the first position, and the movable member 130 located at the first position is in contact with the cage member 110; when the rotor shaft 204 rotates at a second speed, the electromagnetic member 150 is de-energized to move the movable member 130 located at the first position to the second position, and the movable member 130 located at the second position is spaced apart from the cage member 110, and the first speed is less than the second speed. In this way, the moving component 130 is located in different positions, which changes the support stiffness of the elastic support device 100. It can match the rotor shaft 204 at different speeds, avoid the critical speed of the rotor shaft 204, effectively suppress the peak vibration of the rotor shaft 204 within the working speed range of the rotor shaft 204, improve the rotor dynamic characteristics, reduce vibration, and reduce the vibration peak value. The moving component 130 is driven to move by the electromagnetic component 150, which has high adjustment accuracy, fast response speed, and is reliable and durable.

[0103] To quantify and verify the effect of moving components at different locations on the stiffness variation of the entire elastic support device, the elastic support device 100 is mounted on the test bench 200. The test bench 200 supports the elastic support device 100. The rotor shaft 204 is connected to the elastic support device 100. The rotor shaft 204 protrudes from the elastic support device 100 along the axial direction D1 of the cage member 110. The elastic support device 100 is located at the middle of the rotor shaft 204. Weights are suspended at both ends of the rotor shaft 204 along its axial direction. A first weight 202 is suspended at one end of the rotor shaft 204 along its axial direction, and a second weight 203 is suspended at the other end. The first weight 202 and the second weight 203 are symmetrically arranged.

[0104] An eddy current displacement sensor 201 is also provided on the side of the elastic support device 100. The eddy current displacement sensor 201 is used to detect the deformation range of the elastic support device 100. The eddy current displacement sensor 201 is fixed in the installation position to eliminate the influence of the installation position on the test results. The rotor shaft 204 rotates at different speeds, and the eddy current displacement sensor 201 can measure the different deformation ranges of the elastic support device 100 respectively.

[0105] Figure 9A load-displacement curve is shown, wherein the electromagnetic component 150 is de-energized and the moving component 130 is in the second position. The horizontal axis shows the displacement of the elastic support device 100, and the vertical axis shows the load of two weights applied to the rotor shaft 204. The load refers to the total weight of the first weight 202 and the second weight 203. The load-displacement curve of the controllable stiffness elastic support device 100 is thus derived. The slope of the displacement-load curve represents the static stiffness of the elastic support device 100.

[0106] The first weight 202 is loaded multiple times. The second weight 203 is loaded multiple times. It is understandable that the first weight 202 and the second weight 203 are simultaneously subjected to the same load. Figure 9 In the diagram, different colored lines indicate different load conditions. The eddy current displacement sensor 201 detects different displacements of the elastic support device 100.

[0107] Figure 10 Another load-displacement curve is shown, in which the electromagnetic component 150 is energized and the moving component 130 is in a first position. The first weight 202 is subjected to multiple loading cycles. The second weight 203 is subjected to multiple loading cycles. It is understood that the first weight 202 and the second weight 203 are simultaneously subjected to the same load. Figure 10 In the diagram, different colored lines indicate different load conditions. The eddy current displacement sensor 201 detects different displacements of the elastic support device 100.

[0108] A speed sensor is installed on the rotor shaft 204 to monitor its rotational speed. When the rotor shaft 204 rotates, the rotor speed detected by the speed sensor is transmitted to an analog-to-digital converter (ADC) via a speed signal, and then transmitted to a computer. When the speed sensor detects that the rotor speed is approaching a critical speed, the computer sends a command to the programmable DC power supply via a power amplifier, and the programmable DC power supply begins to supply DC power to the electromagnet. After the electromagnet is energized, the attraction moving member 130 moves downward along the radial direction D2 of the cage member 110, thereby making close contact with the cage bars 111 and changing the support stiffness. The formula for the stiffness change of the elastic support device 100 is:

[0109]

[0110] In the above formula, n is the number of cage bars 111, E is the Young's modulus of the cage bar 111 material, b is the width of the cage bar 111, h is the height of the cage bar 111, and L is the effective length of the cage bar 111. When the moving component 130 is not in contact with the cage bars 111, the effective length of the cage bars 111 is 85.6 mm, and the stiffness of the elastic support structure is 4.5E6 N / m.

[0111] When the electromagnet is energized, the moving member 130 moves to a first position along the radial direction D2 of the cage member 110. At the first position, the moving member 130 makes close contact with the cage bars 111, and the overall structural stiffness of the elastic support device 100 is 2.25E6 N / m. This increases the stiffness of the elastic support device 100, leading to an increase in the critical speed of the rotor shaft 204, thereby effectively reducing the resonance peak value.

[0112] As the rotational speed of rotor shaft 204 continues to increase, the speed sensor detects that the rotor speed is approaching the critical speed for high stiffness and transmits the speed signal to the computer via an analog-to-digital converter. The computer sends a command to the DC power supply via a power amplifier, and the DC power supply stops supplying power. The electromagnet is de-energized, its magnetism disappears, and the moving member 130 moves to the second position along the radial direction D2 of the cage member 110 under the action of the elastic member 170. The moving member 130 in the second position is spaced apart from the cage member 110. In this way, the stiffness of the elastic support device 100 decreases, and the critical speed of rotor shaft 204 decreases accordingly, thus avoiding the rotational speed of rotor shaft 204 at this time and effectively suppressing the peak vibration of rotor shaft 204.

[0113] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Terms such as “part” or “component” appearing herein can refer to a single part or a combination of multiple parts. Terms such as “installation” or “installation” appearing herein can refer to one component being directly attached to another component or one component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0114] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A variable stiffness elastic support device for an engine rotor shaft, characterized in that, The elastic support device includes: A cage member (110) is used to connect the rotor shaft (204) of the engine. The cage member (110) includes a plurality of cage bars (111) which are spaced apart along the circumferential direction of the cage member (110). A movable member (130) is movable relative to the cage member (110) in the radial direction of the cage member; An electromagnetic component (150) corresponds to the moving component (130) along the radial direction, and the electromagnetic component (150) drives the moving component (130) to move relative to the cage component (110) between a first position and a second position. The movable member (130) located at the first position is situated between adjacent cage bars (111), and the movable member (130) located at the first position is in contact with the cage member (110). The movable member (130) located in the second position is spaced apart from the cage member (110). The cage member (110) further includes a base (113) and an outer edge (114). The base (113) is connected to one end of the cage bar (111) along the axial direction of the cage member (110), and the outer edge (114) is connected to the other end of the cage bar (111) along the axial direction. The movable member (130) includes a main body (131). The main body (131) located in the first position is in contact with the cage bar (111), the main body (131) located in the first position is in contact with the base (113), and the main body (131) located in the first position is in contact with the outer edge (114). The elastic support device also includes a plurality of electromagnetic components (150), which are spaced apart along the circumferential direction of the cage component (110).

2. The elastic support device according to claim 1, characterized in that, The movable member (130) also includes a protrusion (132) that protrudes from the end of the main body (131), and the outer edge (114) includes a notch (115) in which the protrusion (132) is located.

3. The elastic support device according to claim 1, characterized in that, The elastic support device further includes a first moving member and a second moving member, which are located on both sides of the cage member along the radial direction. The same electromagnetic member can drive both the first moving member and the second moving member to move.

4. The elastic support device according to claim 1, characterized in that, The electromagnetic component (150) is located inside the cage component (110), and the electromagnetic component (150) is energized so that the moving component (130) located in the second position moves toward the electromagnetic component (150) to the first position.

5. The elastic support device according to claim 1, characterized in that, The elastic support device includes a fixing member (160), the fixing member (160) including a receiving chamber (161), the receiving chamber (161) receiving the cage member (110).

6. The elastic support device according to claim 5, characterized in that, The elastic support device further includes a guide member (173) connected to the movable member. The fixed member is provided with a through hole, and the guide member (173) is inserted into the through hole. The guide member is movable relative to the through hole in the radial direction to guide the movable member (130) to move in the radial direction.

7. The elastic support device according to claim 6, characterized in that, The elastic support device further includes an elastic member (170), one end (171) of the elastic member (170) along the radial direction abuts against the guide member (173), and the other end (172) of the elastic member (170) along the radial direction abuts against the fixed member (160). The elastic member (170) is capable of elastic deformation along the radial direction so that the moving member (130) in the current position moves to the second position.

8. A control method, characterized in that, The control method employs an elastic support device according to any one of claims 1-7, the elastic support device being used for the rotor shaft (204) of the engine, the cage member (110) being connected to the rotor shaft (204), and the control method comprising: When the rotor shaft (204) rotates at a first speed, the electromagnetic component (150) is energized so that the moving component (130) located in the second position moves to the first position, and the moving component (130) located in the first position is in contact with the cage component (110); When the rotor shaft (204) rotates at a second speed, the electromagnetic component (150) is de-energized so that the moving component (130) located at the first position moves to the second position, the moving component (130) located at the second position is spaced apart from the cage component (110), and the first speed is less than the second speed.

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