Design Method of Actuating Mechanism for Adjustable Bleed Valve of Aeroengine

Abstract

The present invention discloses a design method for an adjustable bleed valve actuating mechanism of an aeroengine, which relates to the field of aeroengine design and is used to improve the design efficiency of the adjustable bleed valve actuating mechanism of the aeroengine. The method comprises the following steps: establishing a first coordinate system, a second coordinate system and a third coordinate system of the actuating mechanism, and defining the following characteristic points: the rotation shaft center of the driving crank is the characteristic point A, the rotation connection point of the driving crank and the driven connecting rod is the characteristic point B, the rotation connection point of the driven connecting rod and the rocker arm is the characteristic point C, the valve shaft center is the characteristic point D, the rotation connection point of the driving crank and the linkage ring is the characteristic point E, the rotation connection point of the driving connecting rod and the driving crank is the characteristic point F, and the rotation connection point of the driving connecting rod and the actuating cylinder is the characteristic point G; setting input parameters; and calculating the target parameters in three states of the bleed valve being closed, half-open and fully open. The above technical solution has high design efficiency.

Description

Technical Field

[0001] The present invention relates to the field of compressors of aero-engines, and particularly to a design method for an actuating mechanism of an adjustable bleed valve of an aero-engine. Background Art

[0002] Modern civil aero-engines are high-bypass turbofan engines. To solve problems such as surging caused by the mismatch between the flow rate of the booster stage and the flow rate of the high-pressure compressor at low rotational speeds, an adjustable bleed mechanism is designed between the fan booster stage and the high-pressure compressor. When the bleed valve of the adjustable bleed mechanism is opened, the air flow rate at the inlet of the high-pressure compressor is reduced by bleeding, avoiding blockage of the high-pressure compressor due to an excessive flow coefficient, thereby improving the matching relationship between the booster stage and the high-pressure compressor and preventing the occurrence of engine surging and other situations.

[0003] The design focus of an inboard-opening adjustable bleed mechanism is the design of the actuating mechanism. The actuating mechanism includes an actuating cylinder, a connecting rod, a bleed valve, a crank, and a linkage ring. After these components are assembled, the final state of the structure is determined through kinematic analysis. In related technologies, after selecting the structural form of the mechanism, a graphical method or a trial-and-error method is used to determine the dimensions of the mechanism components.

[0004] The inventor found that there are at least the following problems in the prior art: The graphical method or the trial-and-error method is used in the related technologies to determine the dimensions of the mechanism components, which requires a large number of iterative calculations. For complex spatial motions, these methods are less efficient. Summary of the Invention

[0005] The present invention provides a design method for an actuating mechanism of an adjustable bleed valve of an aero-engine to improve the design efficiency of the actuating mechanism of the adjustable bleed valve of the aero-engine.

[0006] An embodiment of the present invention provides a design method for an actuating mechanism of an adjustable bleed valve of an aero-engine, including the following steps:

[0007] Establish a first coordinate system, a second coordinate system, and a third coordinate system for the actuating mechanism; wherein, the first coordinate system takes a point on the axis of the rotating shaft of the fan booster stage as the coordinate origin, the second coordinate system is obtained by rotating the first coordinate system, and the third coordinate system is obtained by translating the first coordinate system; and the following characteristic points are defined: the center point of the rotating shaft of the active crank is characteristic point A, the rotatable connection point of the active crank and the driven connecting rod is characteristic point B, the rotatable connection point of the driven connecting rod and the rocker arm is characteristic point C, the center point of the rotating shaft of the valve is characteristic point D, the rotatable connection point of the active crank and the linkage ring is characteristic point E, the rotatable connection point of the active connecting rod and the active crank is characteristic point F, and the rotatable connection point of the active connecting rod and the actuating cylinder is characteristic point G;

[0008] Set input parameters;

[0009] Based on the parameter input quantity and the coordinate system, the target parameters in the three states of the bleed valve being closed, half - open, and fully open are calculated.

[0010] In some embodiments, the parameter input quantity includes at least one of the following: the rotation angle of the bleed valve, the coordinate value of feature point D, the coordinate value of feature point A relative to feature point D, the axis vector at feature point A, the axis vector at feature point G, the projection length and angle of the line connecting feature point A and feature point B in the XZ plane, the projection angle of the line connecting feature point A and feature point B in the XY plane, the projection length and angle of the line connecting feature point A and feature point E in the XZ plane, the projection angle of the line connecting feature point A and feature point E in the XY plane, the projection length and angle of the line connecting feature point A and feature point F in the XZ plane, the projection angle of the line connecting feature point A and feature point F in the XY plane, the projection length and angle of the line connecting feature point D and feature point C in the XZ plane, the projection angle of the line connecting feature point D and feature point C in the XY plane, the projection length and angle of the line connecting feature point F and feature point G in the XZ plane, the projection angle of the line connecting feature point F and feature point G in the XY plane, the abscissa of the inner casing through - hole; wherein the first coordinate system is the XYZ coordinate system.

[0011] In some embodiments, the target parameters include at least one of the following: the actuation distance, the rotation angle of the active crank, the coordinate values of each feature point, the radius values of the two intersection points of the actuating mechanism and the inner casing through - hole, the joint bearing angle at feature point B, the joint bearing angle at feature point E, the joint bearing angle at feature point F.

[0012] In some embodiments, the following target parameters are calculated:

[0013] In the first coordinate system, based on the coordinate value of feature point D and the coordinate value of feature point A relative to feature point D; and / or,

[0014] In the first coordinate system, calculate the coordinates of feature point C when the bleed valve is closed; and / or,

[0015] In the first coordinate system, calculate the coordinates of feature point C when the bleed valve is fully open; and / or,

[0016] In the first coordinate system, calculate the rotation angle of the active crank when the bleed valve is fully open; and / or,

[0017] Based on the rotation angle of the active crank, calculate the cylindrical coordinates of the rotated feature points B, E, and F in the second coordinate system; and / or,

[0018] Through coordinate transformation, obtain the absolute coordinate values of feature points B, E, and F in the third coordinate system; and / or,

[0019] By means of coordinate transformation, the absolute coordinate values of feature points B, E, and F in the first coordinate system are obtained; and / or,

[0020] In the first coordinate system, calculate the coordinates of feature point G when the bleed valve is closed.

[0021] In some embodiments, calculate the unit vector of the second coordinate system, which is obtained by rotating the first coordinate system with feature point A as the coordinate origin; the third coordinate system is obtained by translating the first coordinate system with feature point A as the coordinate origin. The following steps are used to calculate the rotation angle of the active crank when the bleed valve is fully open:

[0022] Calculate the coordinates of feature point B in the third coordinate system;

[0023] Calculate the coordinates of feature point B in the second coordinate system;

[0024] Calculate the rotated coordinates of feature point B in the second coordinate system;

[0025] Calculate the coordinates of the rotated feature point B in the third coordinate system;

[0026] Calculate the coordinates of the rotated feature point B in the first coordinate system.

[0027] Based on the coordinates of feature point B in the first coordinate system obtained according to the above steps, use the bisection method to calculate the rotation angle of the active crank.

[0028] In some embodiments, the method further includes the following steps:

[0029] According to the rotation angle of the active crank, calculate the coordinates and cylindrical coordinates of the rotated feature points B, E, and F in the second coordinate system;

[0030] By means of coordinate transformation, calculate the coordinates of feature points B, E, and F in the first coordinate system.

[0031] In some embodiments, the method further includes the following steps:

[0032] Calculate the coordinates of feature point G when the bleed valve is closed.

[0033] In some embodiments, one of the following steps is used to calculate the actuation distance:

[0034] According to the coordinates of feature point F and feature point G when the bleed valve is closed, and the coordinates of feature point F when the bleed valve is fully open, use the bisection method to calculate the actuation displacement.

[0035] In some embodiments, the method further includes the following steps:

[0036] Calculate the first intersection point of the line connecting feature point A, feature point B, and feature point C with the through-hole of the inner casing;

[0037] Calculate the second intersection point of the actuating mechanism with the through-hole of the inner casing;

[0038] Calculate the radii of the above first intersection point and the second intersection point to determine whether the actuating mechanism interferes with the movement of the inner casing.

[0039] In some embodiments, the method further includes the following steps:

[0040] Calculate the radius of feature point E to determine whether the linkage ring interferes with the flow channel.

[0041] In some embodiments, the method further includes the following steps:

[0042] Calculate the coordinates of each point of the actuating mechanism when the valve is half open; and / or,

[0043] Calculate the normal vector of the crank connecting rod at feature point E when the valve is half open; and / or,

[0044] Calculate the normal vector of the crank at feature point B when the valve is half open; and / or,

[0045] Calculate the normal vector of the crank at feature point F when the valve is half open.

[0046] In some embodiments, the method further includes the following steps:

[0047] Calculate the normal vectors of the crank connecting rod at feature points B, E, and F when the valve is closed and fully open;

[0048] Calculate the normal vectors of the driven connecting rod at feature points B and C when the valve is half open.

[0049] In some embodiments, the method further includes the following steps:

[0050] Calculate the normal vectors of the driven connecting rod at feature points B and C when the valve is closed and fully open;

[0051] Calculate the normal vectors of the driving connecting rod at feature points F and G when the valve is half open, closed, and fully open.

[0052] In some embodiments, the method further includes the following steps:

[0053] Calculate the included angle of the spherical plain bearing at feature points B and F when the valve is half open, closed, and fully open, that is, the included angle between the normal vector of the crank and the normal vector of the connecting rod;

[0054] Calculate the spherical plain bearing angle at feature point E when the valve is half open, closed, and fully open.

[0055] The above technical solution realizes the design of the actuator mechanism through calculation, with a fast calculation speed, reducing the number of iterations in the mechanism design process and improving the efficiency of the structural design. Brief Description of the Drawings

[0056] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0057] Figure 1 is a three-dimensional structure diagram of the bleed valve actuator mechanism;

[0058] Figure 2 is a projection view of the bleed valve actuator mechanism in the XZ plane;

[0059] Figure 3 is a projection view of the bleed valve actuator mechanism in the XY plane;

[0060] Figure 4 is a projection view of the simplified model of the bleed valve actuator mechanism in the XZ plane;

[0061] Figure 5 is a projection view of the simplified model of the bleed valve actuator mechanism in the XY plane;

[0062] Figure 6 is a schematic flow chart of the design method of the adjustable bleed valve actuator mechanism for an aeroengine provided by an embodiment of the present invention.

[0063] Figure 7 is a schematic flow chart of the design process of the adjustable bleed valve actuator mechanism for an aeroengine provided by an embodiment of the present invention. Detailed Description of the Embodiments

[0064] The following Figures 1 to 7 elaborates in more detail on the technical solution provided by the present invention.

[0065] Explanation of the nouns or terms used herein.

[0066] Adjustable bleed valve (Variable Bleed Valve): Located in the box between the intermediate casing and the outer and inner bypass flow paths, used to improve the flow matching relationship between the booster stage and the high-pressure compressor.

[0067] Refer to Figures 1 to 3 , the adjustable bleed valve actuator mechanism of the aeroengine includes a driving link 1, a driving crank 2, a driven link 3, a rocker arm 4, a bleed valve 5, and a linkage ring 6. The driving crank 2 has three arms, which are respectively connected to the driving link 1, the driven link 3, and the linkage ring 6. The rotating shaft of the driving crank 2 is installed in the inner casing (not shown in the figure).

[0068] An embodiment of the present invention provides a design method for an adjustable bleed valve actuating mechanism of an aeroengine, including the following steps:

[0069] Step S100: Establish a first coordinate system, a second coordinate system, and a third coordinate system for the actuating mechanism.

[0070] Among them, the first coordinate system takes a certain point (not required to specify which specific point, can be arbitrarily selected) on the axis of the rotating shaft of the fan booster stage as the coordinate origin: (0, 0, 0).

[0071] The second coordinate system is obtained by rotating the first coordinate system, and the origin of the second coordinate system is the center point of the rotating shaft of the active crank, that is, the feature point A described later.

[0072] The third coordinate system is obtained by translating the first coordinate system, and the origin of the third coordinate system is the center point of the rotating shaft of the active crank, that is, the feature point A described later.

[0073] In Figure 1 the illustrated case, the first coordinate system is established. See Figure 1 , Figure 1 is a three-dimensional structure diagram of the bleed valve actuating mechanism, Figure 2 is a projection view of the bleed valve actuating mechanism on the XZ plane, Figure 3 is a projection view of the bleed valve actuating mechanism on the XY plane. Simplify the bleed valve actuating mechanism, Figure 4 is a projection view of the simplified model of the bleed valve actuating mechanism on the XZ plane, Figure 5 is a projection view of the simplified model of the bleed valve actuating mechanism on the XY plane.

[0074] And, define the following feature points: the center point of the rotating shaft of the active crank 2 is the feature point A, the rotatable connection point of the active crank 2 and the driven connecting rod 3 is the feature point B, the rotatable connection point of the driven connecting rod 3 and the rocker arm 4 is the feature point C, the center point of the rotating shaft of the valve is the feature point D, the rotatable connection point of the active crank 2 and the linkage ring 6 is the feature point E, the rotatable connection point of the active connecting rod 1 and the active crank 2 is the feature point F, and the rotatable connection point of the active connecting rod 1 and the actuating cylinder is the feature point G.

[0075] Step S200: Set input parameters.

[0076] The first coordinate system is the XYZ coordinate system. In some embodiments, the parameter input quantity includes at least one of the following: the rotation angle of the bleed valve 5, the coordinate value of the feature point D, the coordinate value of the feature point A relative to the feature point D, the axis vector at the feature point A, the axis vector at the feature point G, the projection length and angle of the line connecting the feature points A and B in the XZ plane, the projection angle of the line connecting the feature points A and B in the XY plane, the projection length and angle of the line connecting the feature points A and E in the XZ plane, the projection angle of the line connecting the feature points A and E in the XY plane, the projection length and angle of the line connecting the feature points A and F in the XZ plane, the projection angle of the line connecting the feature points A and F in the XY plane, the projection length and angle of the line connecting the feature points D and C in the XZ plane, the projection angle of the line connecting the feature points D and C in the XY plane, the projection length and angle of the line connecting the feature points F and G in the XZ plane, the projection angle of the line connecting the feature points F and G in the XY plane, the abscissa of the inner casing through hole.

[0077] At the beginning of the design, some input parameters need to be preset. The following (1) to (11) are all values in the first coordinate system. In some embodiments, the input parameters mainly include the following categories:

[0078] (1) Bleed valve rotation angle: rot_hm.

[0079] (2) Coordinates of feature point D: (x4, y4, z4).

[0080] (3) Coordinates of feature point A (relative to feature point D): (dx1, dy1, dz1).

[0081] (4) Axis vector at feature point A: (nx1, ny1, nz1).

[0082] (5) Axis vector at feature point G: (nx7, ny7, nz7).

[0083] (6) Projection length l1 and angle alf of the line connecting feature points A and B in the XZ plane, and projection angle beta1 in the XY plane.

[0084] (7) Projection length l2 and angle alf2 of the line connecting feature points A - E in the XZ plane, and projection angle beta2 in the XY plane.

[0085] (8) Projection length l3 and angle alf3 of the line connecting feature points A - F in the XZ plane, and projection angle beta3 in the XY plane.

[0086] (9) Projection length l4 and angle alf of the line connecting feature points D - C in the XZ plane, and projection angle beta4 in the XY plane.

[0087] (10) The projected length l5 and angle alf5 of the line connecting feature point F and feature point G in the XZ plane, and the projected angle beta5 in the XY plane.

[0088] (11) Abscissa of the through-hole of the inner casing: x n .

[0089] In this article, the design input parameters are described as follows:

[0090] First, regarding the description of positive and negative signs.

[0091] 1) Rotation angle: Counterclockwise is positive.

[0092] 2) Straight-line angle: The angle of line AB is the angle between line AB and the positive x-axis with point A as the origin. That is, the angles of line AB and line BA are different. In the input parameters, the line connecting feature point A and feature point B has point A as the origin.

[0093] 3) Displacement: Along the vector direction is positive.

[0094] 4) Relative value: Greater than the reference value is positive.

[0095] Secondly, regarding the description of the projected angle.

[0096] 1) Angle value: The angle of line AB is related to the quadrant where feature point B is located.

[0097] If feature point B is in the first quadrant, it is 0 to 90 degrees, in the second quadrant it is 90 to 180 degrees, in the third quadrant it is -180 to -90 degrees, and in the fourth quadrant it is -90 to 0 degrees.

[0098] 2) The projected angles in the XZ plane and the XY plane cannot conflict: The positive and negative of the x value calculated for the projected angles of line AB in the XZ and XY planes should be consistent.

[0099] For example, if the projected angle in the XZ plane is 100° and the projected angle in the XY plane is 40°, then there is a conflict.

[0100] 3) The projected angle of the line connecting the valve shaft and the rocker shaft in the XY plane is set to 0.0 degrees.

[0101] Step S300: According to the parameter input quantity and the coordinate system, calculate the target parameters in the three states of the bleed valve being closed, half-open, and fully open.

[0102] In some embodiments, the target parameters include at least one of the following: actuation distance, active crank rotation angle, coordinate values of each feature point, radius values of the two intersection points of the actuating mechanism and the through-hole of the inner casing, joint bearing angle at feature point B, joint bearing angle at feature point E, joint bearing angle at feature point F.

[0103] In some embodiments, the following target parameters are calculated: based on the coordinate values of feature point D and the coordinate values of feature point A relative to feature point D; and / or, calculate the coordinates of feature point C when the bleed valve is closed; and / or, calculate the coordinates of feature point C when the bleed valve is fully open; and / or, calculate the rotation angle of the active crank when the bleed valve is fully open; and / or, based on the rotation angle of the active crank, calculate the cylindrical coordinates of the rotated feature points B, E, and F in the second coordinate system with feature point A as the coordinate origin; and / or, through coordinate transformation, obtain the absolute coordinate values of feature points B, E, and F in the first coordinate system; and / or, calculate the coordinates of feature point G when the bleed valve 5 is closed. The numerical values of the above target parameters are in the first coordinate system, except those specified in the second coordinate system.

[0104] In some embodiments, the following steps are used to calculate the rotation angle of the active crank 2 when the bleed valve 5 is fully open:

[0105] Calculate the unit vector of the second coordinate system, which is obtained by rotating the first coordinate system with feature point A as the coordinate origin;

[0106] Calculate the coordinates of feature point B in the first coordinate system;

[0107] Calculate the coordinates of feature point B in the second coordinate system;

[0108] Calculate the rotated coordinates of feature point B in the second coordinate system;

[0109] Calculate the coordinates of the rotated coordinates of feature point B in the third coordinate system;

[0110] Calculate the coordinates of the rotated coordinates of feature point B in the first coordinate system;

[0111] Based on the coordinates of feature point B in the first coordinate system obtained from the above steps, use the bisection method to calculate the rotation angle of the active crank 2.

[0112] In some embodiments, the method further includes the following steps: based on the rotation angle of the active crank 2, calculate the coordinates and cylindrical coordinates of the rotated feature points B, E, and F in the second coordinate system; through coordinate transformation, calculate the coordinates of feature points B, E, and F in the first coordinate system.

[0113] In some embodiments, the method further includes the following steps: calculate the coordinates of feature point G when the bleed valve 5 is closed.

[0114] In some embodiments, one of the following steps is adopted to calculate the actuation distance: According to the coordinates of feature point F and feature point G when the bleed valve 5 is closed, and the coordinates of feature point F when the bleed valve 5 is fully open, the bisection method is used to calculate the actuation displacement.

[0115] In some embodiments, the method further includes the following steps: calculating the first intersection point of the connection line of feature point A, feature point B and feature point C and the through hole of the inner casing; calculating the second intersection point of the actuating mechanism and the through hole of the inner casing; calculating the radii of the above first intersection point and the second intersection point to determine whether the actuating mechanism interferes with the movement of the inner casing.

[0116] In some embodiments, the method further includes the following steps: calculating the radius of feature point E to determine whether the linkage ring 6 interferes with the flow channel.

[0117] In some embodiments, the method further includes the following steps in the first coordinate system: calculating the coordinates of the seven feature points A - G of the actuating mechanism when the valve is half open; and / or, calculating the normal vector of the crank connecting rod at feature point E when the valve is half open; and / or, calculating the normal vector of the crank at feature point B when the valve is half open; and / or, calculating the normal vector of the crank at feature point F when the valve is half open. According to the calculation requirements, one or more of the normal vectors designed in this step are calculated.

[0118] In some embodiments, the method further includes the following steps: calculating the normal vectors of the crank connecting rod at feature points B, E and F when the valve is closed and fully open; calculating the normal vectors of the driven connecting rod 3 at feature points B and C when the valve is half open.

[0119] In some embodiments, the method further includes the following steps: calculating the normal vectors of the driven connecting rod 3 at feature points B and C when the valve is closed and fully open; calculating the normal vectors of the driving connecting rod 1 at feature points F and G when the valve is half open, closed and fully open.

[0120] In some embodiments, the method further includes the following steps: calculating the included angles of the spherical plain bearings at feature points B and F when the valve is half open, closed and fully open, that is, the included angle between the crank normal vector and the connecting rod normal vector; calculating the spherical plain bearing angles at feature point E when the valve is half open, closed and fully open.

[0121] The following introduces some detailed calculation processes. It should be noted that unless otherwise specified, it refers to the first coordinate system. If the second coordinate system or the third coordinate system is involved, it will be indicated.

[0122] First, convert the angular value rot_hm of the rotation angle of the input bleed valve 5 into a radian value. Then convert the axis vectors at feature point A and feature point G into unit vectors respectively. Next, the following calculations are carried out.

[0123] (1) Calculate the coordinates (x1, y1, z1) of feature point A.

[0124] x1 = x4 + dx1

[0125] y1 = y4 + dy1

[0126] z1 = z4 + dz1

[0127] (2) Calculate the coordinates (x3, y3, z3) of feature point C when the valve is closed.

[0128] x3 = l4 × cos(alf4) + x4

[0129] y3 = x3 × tan(beta4) + y4

[0130] z3 = l4 × sin(alf4) + z4

[0131] (3) Calculate the coordinates (x 3n , y 3n , z 3n ) of feature point C when the bleed valve 5 is fully open.

[0132] x 3n = l4 × cos(alf4 + rot_hm) + x4

[0133] y 3n = y3 + y4

[0134] z 3n = l4 × sin(alf4 + rot_hm) + z4

[0135] (4) Calculate the rotation angle θ of the active crank 2 when the bleed valve 5 is fully open.

[0136] First step, calculate the unit vectors in the second coordinate system: The second coordinate system has feature point A as the origin of coordinates.

[0137] The direction vector of the Z-axis of the second coordinate system:

[0138] The initial direction vectors of the X-axis and Y-axis are (1, 0, 0) T and (0, 1, 0) T . Standardize them through the Schmidt orthogonalization process. The specific process is as follows:

[0139] The direction vector of the X-axis

[0140]

[0141] Convert the direction vector of the X-axis into a unit vector:

[0142]

[0143] Y-axis direction vector

[0144]

[0145] Convert the Y-axis direction vector into a unit vector.

[0146] Through the above calculations, the unit vector matrix of the second coordinate system is obtained. Through the first step introduced above, the three coordinate axes of the second coordinate system are obtained.

[0147] Step 2: Calculate the coordinates of feature point B in the third coordinate system.

[0148] x2 = l1 × cos(alf1)

[0149] y2 = x2 × tan(beta1)

[0150] z2 = l1 × sin(alf1)

[0151] Step 3: Calculate the coordinates of feature point B in the second coordinate system. According to the following coordinate transformation formula:

[0152]

[0153] Step 4: Calculate the coordinates of feature point B after rotation in the second coordinate system. Calculate according to the following formula:

[0154] x′ = xcosθ - ysinθ

[0155] y′ = xsinθ + ycosθ

[0156] z′ = z

[0157] where θ is the crank rotation angle.

[0158] Step 5: Calculate the coordinates of the rotated feature point B in the third coordinate system, and calculate the coordinates of the rotated feature point B in the first coordinate system.

[0159] According to the coordinate transformation formula:

[0160]

[0161] Step 6: The above-mentioned crank rotation angle θ can be determined by the bisection method. The specific process is as follows:

[0162] Determine the range of θ: [θ min , θ max , for example, θmin can take 0°, θ max can take 90°.

[0163] The function value f: the distance between the feature point B and the feature point C after the crank rotates by an angle θ minus the distance between the feature point B and the feature point C before rotation. That is:

[0164]

[0165] Where:

[0166] x2 = x2 + x1

[0167] y2 = y2 + y1

[0168] z2 = z2 + z1

[0169] x 2n = x 2n + x1

[0170] y 2n = y 2n + y1

[0171] z 2n = z 2n + z1

[0172] Through the above transformation, the coordinates of the feature point B in the third coordinate system are transformed into the coordinates in the first coordinate system.

[0173] Divide the above range n equally to obtain the crank angle θ i , i = 1,..., n + 1. Calculate the corresponding f i values, i = 1,..., n + 1. Find i such that f i × f i+1 ≤ 0

[0174] Take θ i and θ i+1 as the boundaries and use the bisection method to calculate the crank rotation angle.

[0175] (5) According to the crank rotation angle, calculate the coordinates of the rotated feature point B, feature point E, and feature point F in the second coordinate system. And calculate the cylindrical coordinates (r, theta, z) of the feature point B, feature point E, and feature point F respectively.

[0176] (6) Through coordinate transformation, obtain the coordinates of the feature point B, feature point E, and feature point F in the third coordinate system. Finally, perform the following calculations on the coordinate values to obtain the coordinate values in the first coordinate system.

[0177] x 2n = x 2n + x1

[0178] y2n = y 2n + y1

[0179] z 2n = z 2n + z1

[0180] x 5n = x 5n + x1

[0181] y 5n = y 5n + y1

[0182] z 5n = z 5n + z1

[0183] x 6n = x 6n + x1

[0184] y 6n = y 6n + y1

[0185] z 6n = z 6n + z1

[0186] (7) Calculate the coordinates of the characteristic point G when the bleed valve 5 is closed.

[0187] x7 = l5 × cos(alf5) + x6

[0188] y7 = x7 × tan(beta5) + y6

[0189] z7 = l5 × sin(alf5) + z6

[0190] (8) Calculate the actuation displacement.

[0191] According to the coordinates of the characteristic point F and the characteristic point G when the valve is closed, and the coordinates of the characteristic point F when the valve is fully open, the bisection method is used to calculate the actuation displacement. The specific process is as follows:

[0192] Determine the range of the actuator displacement s: [s min , s max , for example, s min can be taken as -100, s max can be taken as 100.

[0193] The function value f: refers to the distance between the translated characteristic point F and the characteristic point G minus the distance between the rotated characteristic point F and the characteristic point G. That is

[0194]

[0195] Where:

[0196] x 7n = x7 + s·nx7

[0197] y 7n = y7 + s·ny7

[0198] z 7n = z7 + s·nz7

[0199] Divide the above range into n equal parts to obtain the actuator displacement s i , i = 1, ..., n + 1. Calculate the corresponding f i values, i = 1, ..., n + 1. Find i such that f i × f i+1 ≤ 0

[0200] Take s i and s i+1 as the boundaries and use the bisection method to calculate the actuator displacement.

[0201] (9) Calculate the coordinates of the first intersection point of the actuator mechanism and the through-hole of the inner casing: (x n1 , y n1 , z n1 ). That is, the intersection point of the line connecting feature point A, feature point B, and feature point C and the through-hole of the inner casing:

[0202] The first case: If (x n - x1) × (x n - x2) ≤ 0

[0203] ratio = (x n - x1) / (x2 - x1)

[0204] x n1 = x n

[0205] y n1 = y1 + ratio·(y2 - y1)

[0206] z n1 = z1 + ratio·(z2 - z1)

[0207] The second case: If (x n - x2) × (x n - x3) ≤ 0

[0208] ratio = (x n - x2) / (x3 - x2)

[0209] x n1 = x n

[0210] y n1= y2 + ratio·(y3 - y2)

[0211] z n1 = z2 + ratio·(z3 - z2)

[0212] (10) Calculate the coordinates of the second intersection point of the actuating mechanism and the through-hole of the inner casing: (x n2 , y n2 , z n2 ). That is, the intersection point of the line connecting feature point A, feature point F, and feature point G and the through-hole of the inner casing:

[0213] The first case: If (x n - x1)×(x n - x6) ≤ 0:

[0214] ratio = (x n - x1) / (x6 - x1)

[0215] x n2 = x n

[0216] y n2 = y1 + ratio·(y6 - y1)

[0217] z n2 = z1 + ratio·(z6 - z1)

[0218] The second case: If (x n - x6)×(x n - x7) ≤ 0:

[0219] ratio = (x n - x6) / (x7 - x6)

[0220] x n2 = x n

[0221] y n2 = y6 + ratio·(y7 - y6)

[0222] z n2 = z6 + ratio·(z7 - z6)

[0223] (11) Calculate the radii of the above first intersection point and the second intersection point. These radii can be used as the basis for the subsequent preliminary judgment of whether the actuating mechanism has movement interference.

[0224]

[0225] (12) Calculate the radius of feature point E. This value can be used as the basis for the subsequent preliminary judgment of whether the linkage ring 6 interferes with the flow channel.

[0226]

[0227] (13) Calculate the coordinates of each point of the actuator when the bleed valve 5 is half open (rot_hm / 2).

[0228] (14) Calculate the normal vector of the driving crank 2 at the characteristic point E when the bleed valve 5 is half open: (0, y5, z5) T

[0229] (15) Calculate the normal vector of the driving crank 2 at the characteristic point B when the bleed valve 5 is half open.

[0230] At this time, the vector is the direction vector of the line connecting the characteristic point B and the characteristic point C. The vector is: (0, y n1 , z n1 ) T , where y n1 and z n1 are the y and z coordinate values of the first intersection point of the actuator and the through hole of the inner casing.

[0231] First step, calculate the vector and the vector of the vector

[0232] Second step, calculate the vector rotated 90 degrees around the vector of the vector That is, the normal vector of the crank at the characteristic point B. If the z-value component of the vector is less than 0, then take the vector as its opposite vector.

[0233] (16) Calculate the normal vector of the driving crank 2 at the characteristic point F when the bleed valve 5 is half open. At this time, the vector is the direction vector of the line connecting the characteristic point F and the characteristic point G. The vector is: (0, y n2 , z n2 ) T , where, y n2 and z n2 are the y and z coordinate values of the intersection point 2 of the actuator and the through hole of the inner casing.

[0234] First, calculate the vector perpendicular to the vector and the vector

[0235] Then, calculate the vector rotated around the vector The vector after rotating 90 degrees That is, the normal vector of the crank at point 6. If the z-value component of the vector is less than 0, then take the vector as its opposite vector.

[0236] (17) Calculate the normal vectors of the active crank 2 at the characteristic points B, E, and F when the air release valve 5 is closed and fully open.

[0237] Rotate the three normal vectors calculated above (i.e., the normal vectors of the active crank 2 at the characteristic points E, B, and F when the air release valve 5 is half open) around the axis vector at the characteristic point A by a certain angle (0° - the rotation angle of the crank when the valve is half open) to obtain the normal vectors of the active crank 2 at the characteristic points B, E, and F when the air release valve 5 is closed (this normal vector is in the third coordinate system).

[0238] Through coordinate transformation, the normal vectors of the crank at the characteristic points B, E, and F in the second coordinate system when the air release valve 5 is closed can be obtained.

[0239] Similarly, calculate the normal vectors of the crank at the characteristic points B, E, and F when the valve is fully open.

[0240] Rotate the normal vectors of the active crank 2 at the characteristic points E, B, and F when the air release valve 5 is half open around the axis vector at the characteristic point A by a certain angle (the rotation angle of the crank when the air release valve 5 is fully open - the rotation angle of the crank when the air release valve 5 is half open) to obtain the normal vectors of the active crank 2 at the characteristic points B, E, and F when the air release valve 5 is closed (this normal vector is in the third coordinate system).

[0241] Through coordinate transformation, the normal vectors of the crank at the characteristic points B, E, and F in the second coordinate system when the air release valve 5 is closed can be obtained.

[0242] (18) Calculate the normal vectors of the driven connecting rod 3 at the characteristic points B and C when the air release valve 5 is half open.

[0243] is the normal vector of the crank at the characteristic point B at this time (see step 15); the vector is the direction vector of the line connecting the characteristic points B and C.

[0244] Calculate the vector and the vector perpendicular to the vector

[0245] Taking as the rotation axis, rotate the vector Rotate counterclockwise by 90 degrees to obtain the normal vector of the connecting rod at feature point B.

[0246] Similarly, the normal vector of the driven connecting rod 3 at feature point C can be calculated. Different from feature point B, at this time vector The calculation and the remaining steps are the same.

[0247] (19) Calculate the normal vectors of the driven connecting rod 3 at feature points B and C when the air release valve 5 is closed and fully open.

[0248] is the direction vector of the line connecting feature points B and C when the air release valve 5 is half open; is the direction vector of the line connecting feature points B and C when the air release valve 5 is closed.

[0249] Calculate vector and vector The vector perpendicular to and the included angle θ: The formula for calculating the included angle is:

[0250] Let be the normal vector of the driven connecting rod 3 at feature point B when the air release valve 5 is half open. Rotate by θ angle with as the rotation axis to obtain the normal vector of the driven connecting rod 3 at feature point B when the air release valve 5 is closed.

[0251] Let be the normal vector of the driven connecting rod 3 at feature point C when the air release valve 5 is half open. Rotate by θ angle with as the rotation axis to obtain the normal vector of the driven connecting rod 3 at feature point C when the air release valve 5 is closed.

[0252] Similarly, calculate the normal vectors of the driven connecting rod 3 at feature points B and C when the air release valve 5 is fully open. Calculate the parameters when the air release valve 5 is fully open. The method is the same as the method for calculating the parameters when the air release valve 5 is closed, except that at this time, the normal vectors of the driven connecting rod 3 at feature points B and C when the air release valve 5 is fully open are calculated based on the relevant parameters when the air release valve 5 is half open.

[0253] (20) Calculate the normal vectors of the driving connecting rod 1 at feature points F and G when the air release valve 5 is half open, closed, and fully open. The method is similar to the calculation method of the driven connecting rod 3. Only at this time, the calculation target is the driving connecting rod 1, and the feature points are feature points F and G.

[0254] (21) Calculate the included angle of the spherical plain bearing at feature points B and F at different valve openings, that is, the included angle between the crank normal vector and the connecting rod normal vector.

[0255] (22) Calculate the angular calculation of the spherical plain bearing at the feature point E at different valve openings. is the normal vector of the crank at the feature point E at this time;

[0256] Through the above calculations, the following target parameters are finally obtained:

[0257] (1) Under the three states of the bleed valve 5 being closed, half-open and fully open: the actuation distance and the crank rotation angle; the coordinate values of each point of the actuation mechanism; the radius values of the first and second intersection points of the actuation mechanism and the through hole of the inner casing; the angular calculation of the spherical plain bearing at the feature points B, E and F.

[0258] (2) Under the state of the bleed valve 5 being closed: the cylindrical coordinates of each point of the crank; the normal vectors of the crank at the feature points B, E and F in the first coordinate system; the normal vectors of the crank at the feature points B, E and F in the second coordinate system.

[0259] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for an adjustable bleed valve actuating mechanism of an aeroengine, characterized in that Including the following steps: Establish a first coordinate system, a second coordinate system, and a third coordinate system for the actuating mechanism; wherein, the first coordinate system takes the point on the axis of the rotating shaft of the fan boost stage as the coordinate origin, the second coordinate system is obtained by rotating the first coordinate system, and the third coordinate system is obtained by translating the first coordinate system; and Define the following characteristic points: the center point of the rotating shaft of the active crank is the characteristic point A, the rotatable connection point of the active crank and the driven connecting rod is the characteristic point B, the rotatable connection point of the driven connecting rod and the rocker arm is the characteristic point C, the center point of the valve rotating shaft is the characteristic point D, the rotatable connection point of the active crank and the linkage ring is the characteristic point E, the rotatable connection point of the active connecting rod and the active crank is the characteristic point F, and the rotatable connection point of the active connecting rod and the actuating cylinder is the characteristic point G; Set the input parameters; According to the parameter input quantity and the coordinate system, calculate the target parameters in the three states of the bleed valve being closed, half-open, and fully open.

2. The method according to claim 1, wherein The parameter input quantity includes at least one of the following: the rotation angle of the bleed valve, the coordinate value of the characteristic point D, the coordinate value of the characteristic point A relative to the characteristic point D, the axis vector at the characteristic point A, the axis vector at the characteristic point G, the projection length and angle of the line connecting the characteristic points A and B on the XZ plane, the projection angle of the line connecting the characteristic points A and B on the XY plane, the projection length and angle of the line connecting the characteristic points A and E on the XZ plane, the projection angle of the line connecting the characteristic points A and E on the XY plane, the projection length and angle of the line connecting the characteristic points A and F on the XZ plane, the projection angle of the line connecting the characteristic points A and F on the XY plane, the projection length and angle of the line connecting the characteristic points D and C on the XZ plane, the projection angle of the line connecting the characteristic points D and C on the XY plane, the projection length and angle of the line connecting the characteristic points F and G on the XZ plane, the projection angle of the line connecting the characteristic points F and G on the XY plane, the abscissa of the inner casing through hole; wherein the first coordinate system is the XYZ coordinate system.

3. The method according to claim 2, characterized in that, The target parameters include at least one of the following: the actuation distance, the rotation angle of the active crank, the coordinate values of each characteristic point, the radius values of the two intersection points of the actuating mechanism and the inner casing through hole, the joint bearing angle at the characteristic point B, the joint bearing angle at the characteristic point E, and the joint bearing angle at the characteristic point F.

4. The method according to claim 2, characterized in that, Calculate the following target parameters: In the first coordinate system, according to the coordinate value of the characteristic point D and the coordinate value of the characteristic point A relative to the characteristic point D; and / or, In the first coordinate system, calculate the coordinate of the characteristic point C when the bleed valve is closed; and / or, In the first coordinate system, calculate the coordinate of the characteristic point C when the bleed valve is fully open; and / or, In the first coordinate system, calculate the rotation angle of the active crank when the bleed valve is fully open; and / or, According to the rotation angle of the active crank, calculate the cylindrical coordinates of the rotated characteristic points B, E, and F in the second coordinate system; and / or, Through coordinate transformation, obtain the absolute coordinate values of the characteristic points B, E, and F in the third coordinate system; and / or, By means of coordinate transformation, obtain the absolute coordinate values of feature points B, E, and F in the first coordinate system; and / or, In the first coordinate system, calculate the coordinates of feature point G when the air release valve is closed.

5. The method according to claim 4, wherein Calculate the unit vectors of the second coordinate system, which is obtained by rotating the first coordinate system with feature point A as the coordinate origin; the third coordinate system is obtained by translating the first coordinate system with feature point A as the coordinate origin. The following steps are used to calculate the rotation angle of the active crank when the air release valve is fully open: Calculate the coordinates of feature point B in the third coordinate system; Calculate the coordinates of feature point B in the second coordinate system; Calculate the coordinates of feature point B after rotation in the second coordinate system; Calculate the coordinates of the rotated feature point B in the third coordinate system; Calculate the coordinates of the rotated feature point B in the first coordinate system; According to the calculated coordinates of feature point B in the first coordinate system, use the bisection method to calculate the rotation angle of the active crank.

6. The method according to claim 5, characterized in that It further includes the following steps: According to the rotation angle of the active crank, calculate the coordinates and cylindrical coordinates of the rotated feature points B, E, and F in the second coordinate system; Through coordinate transformation, calculate the coordinates of feature points B, E, and F in the first coordinate system.

7. The method according to claim 4, characterized in that It further includes the following steps: Calculate the coordinates of feature point G when the air release valve is closed.

8. The method according to claim 2, characterized in that, Use one of the following steps to calculate the actuation distance: According to the coordinates of feature points F and G when the air release valve is closed and the coordinates of feature point F when the air release valve is fully open, use the bisection method to calculate the actuation displacement.

9. The method according to claim 1, wherein It further includes the following steps: Calculate the first intersection point of the connection line of feature points A, B, and C and the through hole of the inner casing; Calculate the second intersection point of the actuating mechanism and the through hole of the inner casing; Calculate the radii of the above first intersection point and the second intersection point to determine whether the actuating mechanism interferes with the movement of the inner casing.

10. The method according to claim 5, characterized in that It further includes the following steps: Calculate the radius of feature point E to determine whether the linkage ring interferes with the flow channel.

11. The method according to claim 5, characterized in that, It further includes the following steps: Calculate the coordinates of each feature point of the simplified model of the actuating mechanism when the valve is half open; and / or, Calculate the normal vector of the crank connecting rod at feature point E when the valve is half open; and / or, Calculate the normal vector of the crank at feature point B when the valve is half open; and / or, Calculate the normal vector of the crank at feature point F when the valve is half open.

12. The method according to claim 5, wherein It further includes the following steps: Calculate the normal vectors of the crank connecting rod at feature points B, E, and F in the cases of the valve being closed and fully open; Calculate the normal vectors of the driven connecting rod at feature points B and C when the valve is half open.

13. The method according to claim 5, wherein It further includes the following steps: Calculate the normal vectors of the driven connecting rod at feature points B and C when the valve is closed and fully open; Calculate the normal vectors of the active connecting rod at feature points F and G when the valve is half open, closed, and fully open.

14. The method according to claim 5, wherein It further includes the following steps: Calculate the included angles of the joint bearings at feature points B and F when the valve is half open, closed, and fully open, that is, the included angles between the crank normal vector and the connecting rod normal vector; Calculate the calculation of the joint bearing angles at feature point E for different cases of the valve being half open, closed, and fully open.

Images