Integrated double-squirrel-cage elastic support pre-adjustment concentric design method

Abstract

The invention belongs to the field of aero-engine dynamics, and particularly relates to an integrated double-squirrel-cage elastic support pre-adjustment concentricity design method. Comprising the following steps: step 1, acquiring an integrated double-squirrel-cage elastic supporting structure; 2, calculating the fulcrum sinkage of the integrated double-squirrel-cage elastic supporting structure; step 3, calculating a static eccentricity rate under the action of a static load according to the fulcrum sinkage, judging whether to carry out pre-adjustment concentric design or not according to the static eccentricity rate, and if so, entering step 4; step 4, calculating a preset concentric amount according to the fulcrum sinkage; and 5, carrying out pre-adjustment concentric design on the integrated double-squirrel-cage elastic supporting structure according to the pre-adjustment concentric quantity. The method has the advantages of being comprehensive in consideration factor, accurate, efficient, standard in process and the like, and the blank of the pre-adjustment concentric design technology of the integrated double-squirrel-cage elastic supporting structure is filled.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine dynamics, and in particular relates to a pre-adjusted concentric design method for an integrated double squirrel cage elastic support. Background Art

[0002] In the dynamic design of aircraft engines, squirrel cage elastic supports are applied. During use, it is found that when the radial load on the support point is large and the flexibility of the squirrel cage elastic support is large, the static deformation of the elastic support is large, causing the limit gap or uneven damper oil film, which in turn leads to poor vibration suppression effect or even failure.

[0003] In the prior art, research has been conducted on the pre-adjusted concentric design technology for single squirrel cage spring supports, but there is a lack of pre-adjusted concentric design methods for the new structure of integrated double spring supports. Based on the above background, it is necessary to consider the concentricity of the damper oil film gap when carrying out the design of the integrated double spring supports, that is, it is necessary to carry out the pre-adjusted concentric design of the integrated double spring supports.

[0004] In order to fill the blank in the technical field of pre-adjusted concentric design of integrated double spring supports and ensure the reasonable design of integrated double spring supports, a pre-adjusted concentric design method of integrated double squirrel cage elastic supports is proposed. The pre-adjusted concentricity of the integrated double spring supports is accurately calculated by comprehensively considering the factors such as the stiffness distribution characteristics of the fulcrum, processing error, and fulcrum load, so as to effectively design the integrated double spring supports.

[0005] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0006] The purpose of the present application is to provide a pre-adjusted concentric design method for an integrated double squirrel cage elastic support to solve at least one problem existing in the prior art.

[0007] The technical solution of this application is:

[0008] A method for pre-adjusting concentricity of an integrated double squirrel cage elastic support, comprising:

[0009] Step 1: obtaining an integrated double squirrel cage elastic support structure;

[0010] Step 2, calculating the pivot point sinking amount of the integrated double squirrel cage elastic support structure;

[0011] Step 3: Calculate the static eccentricity under the static load according to the fulcrum sinking amount, and determine whether to perform pre-adjustment concentricity design according to the static eccentricity. If so, proceed to step 4;

[0012] Step 4, calculating the pre-adjusted concentricity according to the fulcrum sinking amount;

[0013] Step 5: Pre-adjust the concentricity of the integrated double squirrel cage elastic support structure according to the pre-adjusted concentricity.

[0014] In at least one embodiment of the present application, in step 1, the integrated double squirrel cage elastic support structure includes:

[0015] A mounting edge, wherein a mounting stop is arranged on the radial outer side of the mounting edge, and the mounting edge is connected with the limiting outer annular surface through the mounting stop;

[0016] An elastic support, comprising a first elastic support and a second elastic support, wherein the first elastic support and the second elastic support are installed on the radial inner side of the installation edge;

[0017] The bearing seat includes a first elastic support bearing seat and a second elastic support bearing seat, the first elastic support bearing seat is installed on the first elastic support, the first elastic support bearing seat is connected to the first connecting member through a ball bearing, the second elastic support bearing seat is installed on the second elastic support, the second elastic support bearing seat is connected to the second connecting member through a roller bearing, and the first connecting member and the second connecting member are coaxially connected.

[0018] In at least one embodiment of the present application, in step 2, calculating the pivot point sinking amount of the integrated double squirrel cage elastic support structure includes:

[0019] If k 2 >k 1 , then the formula for the static load of the support is:

[0020] G=(σ+e)×k 1 +e×k 2

[0021] σ=σ 1 -σ 2

[0022] According to the fulcrum static load formula, the fulcrum sinking amount is:

[0023]

[0024] Where G is the static load of the support, σ 1 is the machining deviation vector of the inner ring of the first spring support bearing seat, σ 2 is the machining deviation vector of the inner ring of the second spring bearing seat, e is the pivot sinking amount, k 1 is the first elastic support stiffness, k 2 is the second elastic support stiffness.

[0025] In at least one embodiment of the present application, in step three, calculating the static eccentricity under the static load according to the fulcrum sinking amount includes:

[0026] The static eccentricity is:

[0027]

[0028] Among them, ε is the static eccentricity, e is the pivot sinking amount, and c is the radius thickness of the oil film of the squeeze film damper.

[0029] In at least one embodiment of the present application, in step three, if the static eccentricity is greater than 20%, a pre-adjusted concentric design is performed.

[0030] In at least one embodiment of the present application, in step 4, calculating the pre-adjusted concentricity according to the fulcrum sinking amount includes:

[0031] The preset concentricity is:

[0032] δ=e-σ 1 -μ

[0033] Among them, δ is the pre-adjusted concentricity, e is the pivot sinking amount, σ 1 is the machining deviation vector of the inner ring of the first spring-supported bearing seat, and μ is the machining deviation vector of the mounting stop.

[0034] In at least one embodiment of the present application, in step five, the pre-adjusted concentricity design of the integrated double squirrel cage elastic support structure is achieved by controlling the installation stop to be upwardly eccentric by the pre-adjusted concentricity amount relative to the limiting outer ring surface.

[0035] In at least one embodiment of the present application, the method further includes step six, performing strength verification on the integrated double squirrel cage elastic support structure after pre-adjusting the concentric design.

[0036] The invention has at least the following beneficial technical effects:

[0037] The integrated double-cage elastic support pre-adjusted concentric design method of the present application has the characteristics of comprehensive consideration of factors, accuracy and efficiency, and standardized processes. It fills the gap in the pre-adjusted concentric design technology of the integrated double-cage elastic support structure, and comprehensively considers multi-dimensional parameters such as the characteristics of the integrated double-cage elastic support structure, load sharing characteristics, processing technology, and squeeze film damper parameter characteristics. It proposes a detailed calculation formula for the fulcrum sinkage and static eccentricity, and provides a criterion for judging whether it is necessary to carry out the pre-adjusted concentric design of the integrated double-cage elastic support structure. It proposes a calculation formula and adjustment method for the pre-adjusted concentric amount of the integrated double-cage elastic support structure, which effectively ensures that the integrated double-cage elastic support structure is reasonably designed in the installed state, and supplements the integrated double elastic support structure design technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a flow chart of a method for pre-adjusting concentricity of an integrated double squirrel cage elastic support according to an embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of an integrated double squirrel cage elastic support structure according to an embodiment of the present application;

[0040] Figure 3 It is a schematic diagram of the machining deviation of the inner ring of the bearing seat according to one embodiment of the present application.

[0041] in:

[0042] 1-installation edge; 2-installation stop; 3-first elastic support; 4-second elastic support; 5-first elastic support bearing seat; 6-second elastic support bearing seat; 7-ball bearing; 8-roller bearing. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0045] The following is combined with Figures 1 to 3 This application is described in further detail.

[0046] The present application provides a method for pre-adjusting concentricity of an integrated double squirrel cage elastic support. Figure 1 As shown, the following steps are included:

[0047] Step 1: obtaining an integrated double squirrel cage elastic support structure;

[0048] Step 2, calculating the pivot point sinking amount of the integrated double squirrel cage elastic support structure;

[0049] Step 3: Calculate the static eccentricity under the static load according to the fulcrum sinking amount, and determine whether to perform pre-adjustment concentric design according to the static eccentricity. If so, proceed to step 4;

[0050] Step 4: Calculate the pre-adjusted concentricity according to the fulcrum sinking amount;

[0051] Step 5: Pre-adjust the concentricity design of the integrated double squirrel cage elastic support structure according to the pre-adjusted concentricity.

[0052] The integrated double squirrel cage elastic support pre-adjusted concentric design method of the present application designs an integrated double squirrel cage elastic support structure, which is formed by the fusion of two squirrel cage elastic supports, sharing a mounting edge, and respectively mounting a deep groove ball bearing and a roller bearing. Specifically, Figure 2 As shown, the integrated double squirrel cage elastic support structure includes: a mounting edge, an elastic support and a bearing seat, wherein a mounting stop is provided on the radial outer side of the mounting edge, and the mounting edge is connected with the limiting outer ring surface through the mounting stop, and axial positioning is achieved through the mounting edge, and radial positioning is achieved through the mounting stop; the elastic support includes a first elastic support and a second elastic support, and the first elastic support and the second elastic support are installed on the radial inner side of the mounting edge; the bearing seat includes a first elastic support bearing seat and a second elastic support bearing seat, and the first elastic support bearing seat is installed on the first elastic support, and the first elastic support bearing seat is connected to the first connecting member through a ball bearing, and the second elastic support bearing seat is installed on the second elastic support, and the second elastic support bearing seat is connected to the second connecting member through a roller bearing, and the first connecting member and the second connecting member are coaxially connected. After obtaining the above-mentioned integrated double squirrel cage elastic support structure, the relevant structure and load parameters are identified, including the stiffness of each elastic support, the radius thickness of the squeeze film damper, the processing deviation of each key position, the static load of the fulcrum and other parameters; the magnitude of the two elastic support stiffnesses is determined. In this embodiment, the second elastic support stiffness k 2 Higher, the first elastic support stiffness k 1 Since there is a certain proportional relationship between the support stiffness of the first elastic support and the second elastic support in the integrated double squirrel cage elastic support structure, that is, there is a difference in stiffness, the main idea in carrying out the pre-adjusted concentric design of the integrated double squirrel cage elastic support is to pre-adjust the eccentricity of the high-rigidity elastic support while considering the influence of the low-rigidity elastic support.

[0053] In the integrated double squirrel cage elastic support pre-adjusted concentric design method of the present application, in step 2, the schematic diagram of the machining deviation of the inner rings of the two bearing seats is as follows Figure 3 As shown, the first elastic support stiffness is k 1 , the second elastic support stiffness is k 2 , the radial static load on the fulcrum is G, and the coaxiality deviation between the inner ring of the first elastic bearing seat and the inner ring of the second elastic bearing seat due to machining error is σ. The fulcrum sinking amount e of the high-rigidity elastic support is derived as follows:

[0054] If k 2>k 1 , then the formula for the static load of the support is:

[0055] G=(σ+e)×k 1 +e×k 2

[0056] σ=σ 1 -σ 2

[0057] According to the fulcrum static load formula, the fulcrum sinking amount is:

[0058]

[0059] Where G is the static load of the support; σ 1 is the machining deviation vector of the inner ring of the first spring support bearing seat, σ 2 is the machining deviation vector of the inner ring of the second spring bearing seat, with positive direction upward and negative direction downward; e is the fulcrum sinking amount, k 1 is the first elastic support stiffness, k 2 is the second elastic support stiffness.

[0060] Furthermore, the static eccentricity of the integrated double squirrel cage elastic support structure under static load is calculated based on the calculation result of the pivot sinking amount and the radius thickness of the oil film of the squeeze film damper. In step three, the static eccentricity under static load is calculated based on the pivot sinking amount, including:

[0061] The static eccentricity is:

[0062]

[0063] Among them, ε is the static eccentricity, e is the pivot sinking amount, and c is the radius thickness of the oil film of the squeeze film damper.

[0064] In this embodiment, the criterion for whether the pre-adjustment concentricity design is needed is: when the static eccentricity ε>20%, the pre-adjustment concentricity design needs to be carried out, otherwise the pre-adjustment concentricity design is not required.

[0065] Obtain the machining deviation σ of the inner ring coaxiality of the spring-supported bearing seat with low step stiffness 1 , the machining deviation of the outer ring surface of the mounting stop of the integrated double spring support mounting edge and the calculated pivot point sinking result are used to calculate the pre-adjusted concentricity through the formula. In step 4, the pre-adjusted concentricity is calculated according to the pivot point sinking, including:

[0066] The preset concentricity is:

[0067] δ=e-σ 1 -μ

[0068] Among them, δ is the pre-adjusted concentricity, e is the pivot sinking amount, σ 1is the machining deviation vector of the inner ring of the first spring-supported bearing seat, and μ is the machining deviation vector of the mounting stop.

[0069] The integrated double squirrel cage elastic support pre-adjusted concentric design method of the present application, in step 5, the pre-adjusted concentric design of the integrated double squirrel cage elastic support structure is realized by controlling the upward eccentric pre-adjusted concentric amount of the installation stop relative to the limit outer ring surface. Finally, it also includes step 6, a new round of strength verification of the integrated double squirrel cage elastic support structure after the pre-adjusted concentric design is performed, thereby completing the pre-adjusted concentric design of the integrated double squirrel cage elastic support.

[0070] The integrated double-cage elastic support pre-adjusted concentric design method of the present application is aimed at the problem of the integrated double-cage elastic support pre-adjusted concentric design method without a common installation edge, and carries out innovative research on design methods and design processes. The calculation formula of the pivot sinking is derived from the comprehensive consideration of the structural characteristics, load sharing characteristics, processing technology, squeeze film damper parameter characteristics and other dimensions of the integrated double-cage elastic support. By comparing the relationship between the pivot sinking and the radius thickness of the squeeze film damper, it is determined whether to carry out the pre-adjusted concentric design. Finally, according to the pivot sinking, processing tolerance and other parameters, the pre-adjusted concentricity is determined, and the strength evaluation of the integrated double-cage elastic support structure after pre-adjusted concentricity is carried out to ensure that the influence of pre-adjusted concentricity on strength is controllable, and the pre-adjusted concentric design of the integrated double-cage elastic support structure is completed, forming a comprehensive, efficient and accurate integrated double-cage elastic support structure pre-adjusted concentric design method and process.

[0071] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for pre-adjusting concentricity of an integrated double squirrel cage elastic support, characterized in that: include: Step 1: obtaining an integrated double squirrel cage elastic support structure; Step 2, calculating the pivot point sinking amount of the integrated double squirrel cage elastic support structure; Step 3: Calculate the static eccentricity under the static load according to the fulcrum sinking amount, and determine whether to perform pre-adjustment concentricity design according to the static eccentricity. If so, proceed to step 4; Step 4, calculating the pre-adjusted concentricity according to the fulcrum sinking amount; Step 5: Pre-adjust the concentricity of the integrated double squirrel cage elastic support structure according to the pre-adjusted concentricity.

2. The integrated double squirrel cage elastic support pre-adjusted concentric design method according to claim 1 is characterized in that: In step 1, the integrated double squirrel cage elastic support structure includes: A mounting edge, wherein a mounting stop is arranged on the radial outer side of the mounting edge, and the mounting edge is connected with the limiting outer annular surface through the mounting stop; An elastic support, comprising a first elastic support and a second elastic support, wherein the first elastic support and the second elastic support are installed on the radial inner side of the installation edge; The bearing seat includes a first elastic support bearing seat and a second elastic support bearing seat, the first elastic support bearing seat is installed on the first elastic support, the first elastic support bearing seat is connected to the first connecting member through a ball bearing, the second elastic support bearing seat is installed on the second elastic support, the second elastic support bearing seat is connected to the second connecting member through a roller bearing, and the first connecting member and the second connecting member are coaxially connected.

3. The integrated double squirrel cage elastic support pre-adjusting concentric design method according to claim 2 is characterized in that: In step 2, calculating the pivot point sinking amount of the integrated double squirrel cage elastic support structure includes: If k2>k1, the formula for the static load of the support is: G=(σ+e)×k1+e×k2 σ=σ1-σ2 According to the fulcrum static load formula, the fulcrum sinking amount is: Among them, G is the static load of the fulcrum, σ1 is the inner ring machining deviation vector of the first elastic support bearing seat, σ2 is the inner ring machining deviation vector of the second elastic support bearing seat, e is the fulcrum sinking amount, k1 is the first elastic support stiffness, and k2 is the second elastic support stiffness.

4. The integrated double squirrel cage elastic support pre-adjusting concentric design method according to claim 3 is characterized in that: In step three, the static eccentricity under the static load is calculated according to the sinking amount of the fulcrum, including: The static eccentricity is: Among them, ε is the static eccentricity, e is the pivot sinking amount, and c is the radius thickness of the oil film of the squeeze film damper.

5. The integrated double squirrel cage elastic support pre-adjusting concentric design method according to claim 1 is characterized in that: In step three, if the static eccentricity is greater than 20%, a pre-adjusted concentric design is performed.

6. The integrated double squirrel cage elastic support pre-adjusting concentric design method according to claim 1 is characterized in that: In step 4, the pre-adjusted concentricity is calculated according to the fulcrum sinking amount, including: The preset concentricity is: δ=e-σ1-μ Among them, δ is the pre-adjusted concentricity, e is the pivot sinking amount, σ1 is the inner ring machining deviation vector of the first elastic support bearing seat, and μ is the mounting stop machining deviation vector.

7. The integrated double squirrel cage elastic support pre-adjusting concentric design method according to claim 1 is characterized in that: In step five, the integrated double squirrel cage elastic support structure is pre-adjusted and designed to be concentric by controlling the installation stop to be upwardly eccentric by the pre-adjusted concentric amount relative to the limiting outer ring surface.

8. The integrated double squirrel cage elastic support pre-adjusted concentric design method according to claim 1 is characterized in that: The method also includes step six, performing strength check on the integrated double squirrel cage elastic support structure after pre-adjusted concentric design.

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