CN116592811A - Engine axial distance measuring method, control method and measuring device - Google Patents
Engine axial distance measuring method, control method and measuring device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The disclosure relates to an engine axial distance measuring method, a control method and a measuring device, wherein the measuring method comprises the following steps: establishing a first reference plane (6) perpendicular to the axial direction of the engine; the distance U from the first reference plane (6) to the first plane to be measured is measured through a plurality of first measuring holes (11) on the first reference plane (6) i And acquiring the angular positions alpha of the first plurality of measuring holes (11) i The method comprises the steps of carrying out a first treatment on the surface of the Measuring the distance V of the first reference plane (6) to the second plane to be measured by a plurality of second measuring holes (12) j And acquiring the angular positions beta of the second plurality of measuring holes (12) j The method comprises the steps of carrying out a first treatment on the surface of the By means of distance U i And an angular position alpha i Constructing a second reference plane and a three-dimensional coordinate system; distance V j Converting to a three-dimensional coordinate system to obtain a distance W j And utilize the distance W j And an angular position beta j And constructing a third reference plane, and determining the axial distance between the first plane to be measured and the second plane to be measured according to the intersection point coordinates of the third reference plane and the third direction.
Description
Technical Field
The disclosure relates to the field of engine parameter measurement, in particular to an engine axial distance measurement method, a control method and a measurement device.
Background
The quality of the assembly of an aeroengine determines the overall performance of the engine. In the assembly process of the aeroengine, the axial distance of the rotor and the stator of the high-pressure compressor is a key dimension affecting the pneumatic performance of the compressor and the operation of the whole machine, so that the accurate measurement and control of the axial distance in the assembly process are key for ensuring the assembly of the aeroengine.
In the related art known by the inventor, the axial distance between the rear mounting plane of the fan casing and the rear mounting plane of the central transmission gear box is measured by measuring a plurality of axial distances to average, and then the size of an adjusting pad between the compressor rotor and the central transmission gear box is adjusted to control the axial distance of the rotor and the stator, but the axial distance measuring and controlling method has a certain error.
Disclosure of Invention
The embodiment of the disclosure provides an engine axial distance measuring method, a control method and a measuring device, which can reduce errors and realize accurate measurement and control of the engine axial distance.
According to a first aspect of the present disclosure, there is provided an engine axial distance measurement method, comprising:
establishing a first reference plane perpendicular to the axial direction of the engine, wherein a plurality of first measuring holes and a plurality of second measuring holes are formed in the first reference plane;
measuring the distance U from the first reference plane to the first plane to be measured through a plurality of first measuring holes i And acquiring the angular positions alpha of the first measuring holes i ，i＝1,2,3…m；
Measuring the distance V from the first reference plane to the second plane to be measured through a plurality of second measuring holes j And obtain the angular positions beta of the second measuring holes j ，j＝1,2,3…n；
By means of distance U i And an angular position alpha i Constructing a second reference plane, and constructing a three-dimensional coordinate system in a third direction consistent with the axial direction and in a first direction and a second direction which are perpendicular to each other in the second reference plane;
distance V j Converting into a three-dimensional coordinate system to obtain the distance W between each measuring point on the second plane to be measured and the second reference plane j And utilize the distance W j And an angular position beta j Construction of the third baseAnd determining the axial distance between the first plane to be measured and the second plane to be measured according to the intersection point coordinates of the third reference plane and the third direction.
In some embodiments, distance U is utilized i And an angular position alpha i Constructing the second reference plane includes:
distance of U i And an angular position alpha i Performing data fitting through a least square equation to obtain a fitting plane equation of the second reference plane so as to represent the second reference plane; and/or
By means of distance W j And an angular position beta j Constructing the third reference plane includes:
distance W of j And an angular position beta j And performing data fitting through a least square equation to obtain a fitting plane equation of the third datum plane so as to represent the third datum plane.
In some embodiments, the distance V from the first reference plane to the second plane to be measured j The conversion to the three-dimensional coordinate system includes:
the distance V from the first reference plane to the second plane to be measured is converted by a transformation matrix j Conversion into three-dimensional coordinate system, transformation matrix and theta 1 And theta 2 Correlation, where θ is the angle between the first and second reference planes, θ 1 Is the projection angle of the included angle theta in the plane perpendicular to the first direction 2 Is the projection angle of the included angle θ in a plane perpendicular to the second direction.
In some embodiments, the plurality of first measurement holes and the plurality of second measurement holes are distributed along a first pitch circle and a second pitch circle, respectively, the first pitch circle and the second pitch circle being concentric, and a radius of the first pitch circle being greater than a radius of the second pitch circle.
In some embodiments, the plurality of first measurement holes and the plurality of second measurement holes are arranged in groups, each group including the first measurement holes and the second measurement holes located in the same radial direction.
In some embodiments, the origin of the three-dimensional coordinate system is located on a central axis of the engine.
In some embodiments, the first reference plane is axially outside the first plane under test and the second plane under test.
In some embodiments, the first plane to be measured is a fan case rear mounting plane, the second plane to be measured is a center drive gearbox rear mounting plane, and the first reference plane is located axially behind the fan case rear mounting plane in the engine air intake direction.
In some embodiments, further comprising:
during the measurement of the engine axial distance, an axial force is applied to the front end of the drive bevel gear of the center drive gearbox to eliminate bearing play in the center drive gearbox.
According to a second aspect of the present disclosure, there is provided an engine axial distance control method including:
the axial distance is measured according to the axial distance measuring method of the above-described embodiment;
calculating an adjusting pad size according to the axial distance, wherein the adjusting pad is positioned between the compressor rotor and the central transmission gear box, and the adjusting pad size = the axial distance-half of the axial clearance of the bearing-the theoretical axial size;
the adjusting pad is arranged according to the size of the adjusting pad so as to control the axial distance of the engine.
According to a third aspect of the present disclosure, an engine axial distance measuring device is provided for implementing the engine axial distance measuring method of the above embodiment, where the axial distance measuring device includes a flat plate, any side surface of the flat plate in a thickness direction thereof is used as a first reference plane, and a plurality of first measuring holes and a plurality of second measuring holes are provided on the flat plate.
In some embodiments, the plurality of first measurement holes and the plurality of second measurement holes are distributed along a first pitch circle and a second pitch circle, respectively, the first pitch circle and the second pitch circle being concentric, and the first pitch circle having a radius greater than the second pitch circle.
In some embodiments, the plurality of first measurement holes and the plurality of second measurement holes are arranged in groups, each group including the first measurement holes and the second measurement holes located in the same radial direction.
Based on the technical scheme, the axial distance measuring method of the engine of the embodiment of the disclosure directly measures and calculates the distance between the first plane to be measured and the second plane to be measured to replace the average value of the distances of a plurality of measuring points, uses the precise plane of the first reference plane as a unified reference for measurement, obtains the corresponding distance and the corresponding angle position by using the first measuring hole and the second measuring hole on the first reference plane, and calculates the axial distance by constructing the second reference plane, the three-dimensional coordinate system and the third reference plane, thereby greatly reducing the error and remarkably improving the measuring precision of the axial distance of the engine.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:
fig. 1 is a schematic axial dimension of a high pressure compressor rotor according to some embodiments of the present disclosure.
FIG. 2 is a schematic diagram of some embodiments of the engine axial distance measurement principles of the present disclosure.
FIG. 3 is a flow diagram of some embodiments of the engine axial distance measurement and control method of the present disclosure.
FIG. 4 is a schematic structural view of some embodiments of an engine axial distance measurement device of the present disclosure.
Description of the reference numerals
1. A rotor; 2. a stator; 3. an adjustment pad; 4. a fan case; 5. a central drive gearbox; 6. a first reference plane; 7. a first plane to be measured; 8. a second plane to be measured; 9. a central drive gearbox drive bevel gear; 10. a bearing; 11. a first measurement aperture; 12. a second measurement aperture; 13. a first reference circle; 14. and a second circle of degree.
Detailed Description
The present disclosure is described in detail below. In the following paragraphs, the different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless explicitly stated to be non-combinable. In particular, any feature or features may be combined with one or more other features may be desired and advantageous.
The terms "first," "second," and the like in this disclosure are merely for convenience of description to distinguish between different constituent components having the same name, and do not denote a sequential or primary or secondary relationship.
In the description of the present disclosure, it should be understood that the terms "inner", "outer", "upper", "lower", "left", "right", "front" and "rear", etc. indicate orientations or positional relationships that are defined based on objects such as a plane to be measured, a reference plane, or an axial mounting direction of an engine, etc. are merely for convenience in describing the present disclosure, and do not indicate or imply that the device to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present disclosure.
The present disclosure provides an engine axial distance measurement method, as shown in fig. 1 to 4, including:
establishing a first reference plane 6 perpendicular to the axial direction of the engine, wherein a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are formed in the first reference plane 6;
the distance U from the first reference plane 6 to the first plane 7 to be measured is measured by a plurality of first measuring holes 11 i And obtains the angular positions alpha of the plurality of first measuring holes 11 i ，i＝1,2,3…m；
The distance V from the first reference plane 6 to the second plane 8 to be measured is measured by a plurality of second measuring holes 12 j And obtains the angular positions beta of the plurality of second measuring holes 12 j ，j＝1,2,3…n；
By means of distance U i And an angular position alpha i Constructing a second reference plane, and constructing a three-dimensional coordinate system in a third direction consistent with the axial direction and in a first direction and a second direction which are perpendicular to each other in the second reference plane;
distance V j Converting into a three-dimensional coordinate system to obtain the distance W between each measuring point on the second plane 8 to be measured and the second reference plane j And utilize the distance W j And an angular position beta j And constructing a third reference plane, and determining the axial distance between the first plane 7 to be measured and the second plane 8 to be measured according to the intersection point coordinates of the third reference plane and the third direction.
In this embodiment, the distances U from the first measuring holes 11 to the first plane 7 to be measured i The distance from the center measuring point of the first measuring holes 11 to the opposite point of the first plane 7 to be measured along the axial direction of the engine; the distance V from the second measuring holes 12 to the second plane 8 to be measured j Is the distance from the center measuring point of the second measuring holes 12 to the opposite point of the second plane 8 to be measured along the axial direction of the engine.
According to the engine axial distance measuring method, the distance between the first plane to be measured 7 and the second plane to be measured 8 is directly measured to replace the average value of the distances of a plurality of measuring points, the precise plane of the first reference plane 6 is used as a unified reference for measurement, the first measuring hole 11 and the second measuring hole 12 on the first reference plane 6 are used for obtaining corresponding distances and angle positions, the second reference plane is constructed by using the distances and the angle positions obtained through the first measuring hole 11, a three-dimensional coordinate system is constructed on the basis of the second reference plane, the distance from the first reference plane 6 to the second plane to be measured 8 is converted into the three-dimensional coordinate system, a third reference plane is constructed, and the axial distance between the first plane to be measured 7 and the second plane to be measured 8 is determined by using the intersection point coordinates of the third reference plane and the third direction.
According to the engine axial distance measuring method, the distance between the first plane 7 to be measured and the second plane 8 to be measured is directly measured to replace the average value of the distances of a plurality of measuring points, and the axial distance between the first plane 7 to be measured and the second plane 8 to be measured is determined by using the intersection point coordinates of the third reference plane and the third direction, so that errors caused in the measuring process of a plurality of measuring points in the related art can be avoided; the same precise plane, namely the first reference plane 6 is used as a measurement reference, so that errors caused by selecting a plurality of different references in the measurement process can be avoided; constructing a reference plane by using the distances and the angular positions obtained by the first measuring holes 11 and the second measuring holes 12 on the first reference plane 6, so that errors caused by the roughness of the plane to be measured can be reduced, and parallelism errors in the measuring process can be eliminated; the three-dimensional coordinate system is built based on the second reference plane, the distance from the first reference plane 6 to the second plane 8 to be measured is converted into the three-dimensional coordinate system, and the third reference plane is built, so that errors caused by parallelism difference between the first plane 7 to be measured and the second plane 8 to be measured can be eliminated. The measuring method of the embodiment can greatly reduce errors and remarkably improve the measuring precision and the control precision of the axial distance of the engine.
In some embodiments, distance U is utilized i And an angular position alpha i Constructing the second reference plane includes:
distance of U i And an angular position alpha i And performing data fitting through a least square equation to obtain a fitting plane equation of the second reference plane so as to represent the second reference plane.
In some embodiments, distance W is utilized j And an angular position beta j Constructing the third reference plane includes:
distance W of j And an angular position beta j And performing data fitting through a least square equation to obtain a fitting plane equation of the third datum plane so as to represent the third datum plane.
In some embodiments, for example, the second reference plane may be represented by equation (1),
a. b, c-plane equation parameters;
P i -the distance from the centre point of the ith first measuring hole 11 to the centre axis of the engine;
U i -the distance from the centre measurement point of the ith first measurement hole 11 to the first plane 7 to be measured;
α i -the i-th first measuring hole 11 center measuring point angular position;
n-number of first measurement holes 11.
In some embodiments, for example, the third reference plane may be represented by equation (2),
u, v, w-plane equation parameters;
Q j -the distance from the center measuring point of the j-th second measuring hole 12 to the central axis of the engine;
W j -the distance between the j-th measuring point on the second plane 8 to be measured and the second reference plane;
α j -j-th second measuring aperture 12 central measuring point angular position;
m-number of second measurement holes 12.
In the embodiment, the fitting equation of the second reference plane and the third reference plane is obtained by carrying out data fitting through the least square equation, so that the plane equation can be constructed by the parameters obtained through discrete measuring points to represent the whole plane to be measured, the accuracy of axial distance measurement can be improved, and the distance V is calculated by j Converting to a three-dimensional coordinate system to obtain the distance W between each measuring point on the second plane 8 to be measured and the second reference plane j And utilize the distance W j And an angular position beta j And a third reference plane is fitted, so that the influence of the parallelism errors of the second plane 8 to be measured and the third plane to be measured on the measurement result can be reduced.
In some embodiments, the distance V from the first reference plane 6 to the second plane 8 to be measured j The conversion to the three-dimensional coordinate system includes:
the distance V of the first reference plane 6 to the second plane 8 to be measured is converted by a transformation matrix j Conversion into three-dimensional coordinate system, transformation matrix and theta 1 And theta 2 Correlation, where θ is the angle between the first reference plane 6 and the second reference plane, θ 1 Is the projection angle of the included angle theta in the plane perpendicular to the first direction 2 Is the projection angle of the included angle θ in a plane perpendicular to the second direction.
In some embodiments, for example, the transformation matrix may be represented by equation (3),
θ—the angle between the first reference plane 6 and the second reference plane;
θ 1 -the projection angle of the included angle θ in a plane perpendicular to the first direction;
θ 2 -the projection angle of the angle θ in a plane perpendicular to the second direction.
The embodiment transforms the distance V of the first reference plane 6 to the second plane 8 to be measured by a transformation matrix j And the error caused by the parallelism difference of the plane to be measured can be eliminated by converting the plane to a three-dimensional coordinate system and utilizing the included angle between the first reference plane 6 and the second reference plane.
In some embodiments, as shown in fig. 4, the plurality of first measurement holes 11 and the plurality of second measurement holes 12 are respectively distributed along a first pitch circle 13 and a second pitch circle 14, the first pitch circle 13 and the second pitch circle 14 are concentric, and the radius of the first pitch circle 13 is larger than the radius of the second pitch circle 14. For example, the centers of the first and second reference circles 13 and 14 may be located on the central axis of the engine.
In this embodiment, the first measuring holes 11 are distributed along the first reference circle 13, and the distances P from the first measuring holes 11 to the central axis of the engine in the fitting equation can be calculated i Is converted into a radius R of the first reference circle 13, so that measuring different distances P is avoided i And the accuracy of the axial distance measuring method is further improved due to the redundant steps or errors. The same technical effect may also be brought about by arranging a plurality of second measuring holes 12 distributed along the second indexing circle 14.
In some embodiments, the plurality of first measuring holes 11 may be uniformly spaced on the first reference circle 13 and/or the plurality of second measuring holes 12 may be uniformly spaced on the second reference circle 14, which arrangement may directly calculate the angular positions of the first measuring holes 11 and the second measuring holes 12, thereby avoiding errors caused by measuring the angular positions of the first measuring holes 11 and the second measuring holes 12.
In some embodiments, the plurality of first measurement holes 11 and the plurality of second measurement holes 12 are arranged in groups, each group including the first measurement holes 11 and the second measurement holes 12 located in the same radial direction.
In the embodiment, the first measuring holes 11 and the second measuring holes 12 are arranged in groups, and the first measuring holes 11 and the second measuring holes 12 are arranged in the same radial direction, so that the arrangement mode does not need to additionally measure the angles of the measuring holes, the measuring steps are further simplified, and the accuracy of the axial distance measuring method is improved.
In some embodiments, the origin of the three-dimensional coordinate system is located on a central axis of the engine.
In the embodiment, the origin of the three-dimensional coordinate system is arranged on the central axis of the engine, so that the influence of the distance of the origin of the three-dimensional coordinate system from the central axis of the engine on the fitting equation can be ignored, and the fitting equation and the whole measuring method are simpler.
In some embodiments, the first reference plane 6 is located outside the first plane to be measured 7 and the second plane to be measured 8.
In some embodiments, the first reference plane 6 may be located between the first plane to be measured 7 and the second plane to be measured 8, and the first reference plane 6 may also be located on the first plane to be measured 7 or the second plane to be measured 8.
In some embodiments, the first plane 7 to be measured is a fan case rear mounting plane, the second plane 8 to be measured is a central transmission gearbox rear mounting plane, and the first reference plane 6 is located axially behind the fan case rear mounting plane in the engine intake direction.
In this embodiment, as shown in fig. 2, in the engine intake direction, the first reference plane 6 is located axially behind the fan casing rear mounting plane, the radius of the measurable position of the fan casing rear mounting plane is a first radius, the radius of the measurable position of the center drive gearbox rear mounting plane is a second radius, the first radius is larger than the second radius, the positions of the plurality of first measurement holes 11 on the first reference plane 6 correspond to the positions of the first radius in the axial direction, and the positions of the plurality of second measurement holes 12 on the first reference plane 6 correspond to the positions of the second radius in the axial direction.
In some embodiments, after the actual assembly is completed, the front end of the engine rotor 1 as shown in fig. 1 is inserted into the rear end of the central drive gearbox drive bevel gear 9 as shown in fig. 2, with the adjustment pad 3 located between the compressor rotor 1 and the central drive gearbox 5. The central transmission gearbox 5 contains the bearing 10 therein, whereas in the above-described embodiments the non-parallelism of the first plane 7 to be measured and the second plane 8 to be measured is due to bearing play, machining errors, etc.
If the theoretical axial dimension is L, the axial distance is H, the adjustment pad dimension is T, and half of the axial play of the bearing is Δx, then the relationship between them is: l=h+t+. DELTA.x.
In some embodiments, the engine axial distance measurement method further comprises:
during the measurement of the engine axial distance, an axial force is applied to the front end of the central drive gearbox drive bevel gear 9 to eliminate bearing play in the central drive gearbox 5.
In this embodiment, the rotating part of the central drive gearbox can be fixed in the axial direction by applying an axial force to the front end of the central drive gearbox drive bevel gear 9, ensuring a stable bearing condition during measurement.
In some embodiments, as shown in the flow diagram of fig. 3, in combination with fig. 1, 2 and 4, the engine axial distance measurement method includes:
step 110, completing the assembly of the central transmission gearbox 5 to the fan casing 4;
step 120, applying an axial force F to the front end of the central transmission gearbox drive bevel gear 9;
step 130, establishing a first reference plane 6: establishing a first reference plane 6 which is vertical to the axial direction and shown in fig. 4 after the rear mounting plane of the fan casing, wherein the center of the reference circle is positioned on the central axis of the engine;
step 140, measuring distance U i Record its value and angle: the distance U from the first reference plane 6 to the rear mounting plane of the fan case is measured by each first measuring hole 11 i And its corresponding angular position alpha i ；
Step 150, measuring distance V j Record its value and angle: measuring the distance V of the first reference plane 6 from the rear mounting plane of the central transmission gearbox by means of the second measuring holes 12 j And its corresponding angular position beta j ；
Step 160, calculating an axial distance: an axial distance H between the fan case rear mounting plane and the central drive gearbox rear mounting plane is calculated.
In this embodiment, steps 120 and 130 are not sequenced, steps 140 and 150 are not sequenced, and the remaining steps are performed sequentially.
In some embodiments, there are two methods of calculation, the first: by means of distance U i And its corresponding angular position alpha i And constructing a second reference plane J, taking the second reference plane J as a coordinate system XY plane, taking the intersection point of the central axis of the engine and the second reference plane J as an origin O, selecting any one first measuring hole 11, taking the connecting line of a projection point of a central measuring point of the first measuring hole 11 on the second reference plane along the axis direction of the engine and the origin as a first direction, marking the first direction as an X axis, and mutually perpendicular to the first direction on the second reference plane, marking the second direction as a Y axis, and marking the third direction as a Z axis, wherein the third direction is consistent with the axis direction of the engine, thereby constructing an OXYZ coordinate system. Distance V j Converting into an OXYZ coordinate system to obtain the distance W between each measuring point and the reference plane J j And utilize the distance W j And an angular position beta j Constructing a third reference plane K, wherein the coordinate of the intersection point of the third reference plane K and the third direction (Z axis) is the axial distance H;
the second method is as follows: by means of distance V j And its corresponding angular position beta j Constructing a second reference plane J, taking the second reference plane J as a coordinate system XY plane, taking the intersection point of the central axis of the engine and the second reference plane J as an origin O, selecting any second measuring hole 12, taking the connecting line of a projection point of a central measuring point of the second measuring hole 12 on the second reference plane along the axis direction of the engine and the origin as a first direction, marking the first direction as an X axis, and mutually perpendicular to the first direction on the second reference planeThe second direction is marked as the Y-axis and the third direction coincides with the engine axis and is marked as the Z-axis, thus constructing the ozz coordinate system. Distance U i Converting into an OXYZ coordinate system to obtain the distance W between each measuring point and the reference plane J i And utilize the distance W i And an angular position alpha i And constructing a third reference plane K, wherein the coordinate of the intersection point of the third reference plane K and the third direction (Z axis) is the axial distance H.
In some embodiments, the number of first measuring holes 11 and second measuring holes 12 is n, and the first method can be expressed as follows, first fitting the second reference plane J using the least square method,
a. b, c-plane equation parameters;
r—the radius of the first reference circle 13;
U i -the distance from the centre of the ith first measuring hole 11 to the rear mounting plane of the fan casing;
α i -the i-th first measuring hole 11 center measuring point angular position;
n-number of first measurement holes 11.
After constructing the OXYZ coordinate system, the distance V i Converting to the OXYZ coordinate system to obtain the distance W between each measuring point and the second reference plane J i The transformation matrix is:
θ—the angle between the first reference plane 6 and the second reference plane J;
θ x -the projection angle of the included angle θ in the YZ plane;
θ y -the projection angle of the angle θ in the XZ plane.
Distance V j Multiplying the transformed matrix T to obtain a distance W j ，
W j ＝V j ·T (6)
A least squares method is then used to fit a third reference plane K,
wherein u, v, w are plane equation parameters,
u, v, w-plane equation parameters;
r—the radius of the second reference circle 14;
W j -the distance of the measuring point on the J-th central drive gearbox rear mounting plane from the second reference plane J;
β j -the j-th second measuring hole 12 measures the angular position of the central measuring point;
n-number of second measurement holes 12.
And the coordinate of the intersection point of the reference plane K and the Z axis of the coordinate system is H.
Secondly, the present disclosure provides an engine axial distance control method based on an axial distance measured by the engine axial distance measurement method in the above embodiment, including:
calculating an adjusting pad size according to the axial distance, wherein the adjusting pad 3 is positioned between the compressor rotor 1 and the central transmission gear box 5, and the adjusting pad size = half of the axial distance-axial clearance of the bearing-theoretical axial size;
the adjusting pad 3 is provided according to the adjusting pad size to control the engine axial distance.
In some embodiments, as shown in the flow diagram of fig. 3, in combination with fig. 1, 2 and 4, the engine axial distance control method includes:
executing the steps 110 to 160 to measure the axial distance H;
step 170, calculating the size of the adjusting pad and adjusting the adjusting pad accordingly: the desired adjustment pad dimension T can be calculated based on the axial distance H,
T＝H-Δx-L (8)
l-the theoretical axial dimension,
Δx—half of the axial play of the bearing,
the size of the adjusting pad is correspondingly adjusted to be T, so that the accurate control of the axial distance of the engine is realized.
According to the embodiment, the size of the adjusting pad is calculated through the accurately measured axial distance of the engine, and then the accurate control of the axial distance of the engine is realized through the adjustment of the size of the adjusting pad.
Again, the present disclosure also provides an engine axial distance measuring device for implementing the engine axial distance measuring method in the above embodiment, where the axial distance measuring device includes a flat plate, any side surface of the flat plate in the thickness direction thereof is used as the first reference plane 6, and a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are provided on the flat plate.
The axial distance measuring device in this embodiment can be used for providing the first reference plane 6 to obtain a unified reference for measurement, and can also be used for providing the first measuring hole 11 and the second measuring hole 12 to obtain the distance and the angle position of the construction reference plane, so as to reduce the measurement error and avoid the error caused by the parallelism difference, and realize the accurate measurement and the accurate control of the axial distance of the engine.
In some embodiments, the plurality of first measurement holes 11 and the plurality of second measurement holes 12 are distributed along a first pitch circle 13 and a second pitch circle 14, respectively, the first pitch circle 13 and the second pitch circle 14 being concentric, and the radius of the first pitch circle 13 being greater than the second pitch circle 14.
As shown in FIG. 4, the flat plate of this embodiment can be used to fit the distance P from the first measuring holes 11 to the central axis of the engine in the equation by arranging the first measuring holes 11 to be distributed along the first reference circle 13 i Is converted into a radius R of the first reference circle 13, so that measuring different distances P is avoided i And the accuracy of the axial distance measuring method is further improved due to the redundant steps or errors. The same technical effect may also be brought about by arranging a plurality of second measuring holes 12 distributed along the second indexing circle 14.
In some embodiments, the plurality of first measuring holes 11 may be uniformly spaced on the first reference circle 13 and/or the plurality of second measuring holes 12 may be uniformly spaced on the second reference circle 14, which arrangement may directly calculate the angular positions of the first measuring holes 11 and the second measuring holes 12, thereby avoiding errors caused by measuring the angular positions of the first measuring holes 11 and the second measuring holes 12.
In some embodiments, the plurality of first measurement holes 11 and the plurality of second measurement holes 12 are arranged in groups, each group including the first measurement holes 11 and the second measurement holes 12 located in the same radial direction.
According to the embodiment, the first measuring holes 11 and the second measuring holes 12 are arranged in groups, and the first measuring holes 11 and the second measuring holes 12 are arranged in the same radial direction, so that the arrangement mode can directly calculate the angles of the first measuring holes 11 and the second measuring holes 12, the angles of the measuring holes do not need to be additionally measured, the measuring steps are further simplified, and the accuracy of the axial distance measuring method is improved.
The method for measuring the axial distance of the engine, the control method and the measuring device are provided by the present disclosure. Specific examples are set forth herein to illustrate the principles and embodiments of the present disclosure, and the above examples are merely intended to aid in understanding the methods of the present disclosure and the core ideas thereof. It should be noted that it would be apparent to those skilled in the art that various improvements and modifications could be made to the present disclosure without departing from the principles of the present disclosure, and such improvements and modifications would be within the scope of the claims of the present disclosure.
Claims (13)
1. An engine axial distance measurement method comprising:
establishing a first reference plane (6) perpendicular to the axial direction of the engine, wherein a plurality of first measuring holes (11) and a plurality of second measuring holes (12) are formed in the first reference plane (6);
the distance U from the first reference plane (6) to the first plane (7) to be measured is measured through a plurality of first measuring holes (11) respectively i And acquiring the angular positions alpha of a plurality of the first measuring holes (11) i ，i＝1,2,3…m；
Measuring said first measuring holes (12) through a plurality of said second measuring holes, respectivelyDistance V from a reference plane (6) to a second plane (8) to be measured j And acquiring the angular positions beta of a plurality of the second measuring holes (12) j ，j＝1,2,3…n；
By means of distance U i And an angular position alpha i Constructing a second reference plane, and constructing a three-dimensional coordinate system in a third direction consistent with the axial direction and in a first direction and a second direction which are perpendicular to each other in the second reference plane;
distance V j Converting to the three-dimensional coordinate system to obtain the distance W between each measuring point on the second plane (8) to be measured and the second reference plane j And utilize the distance W j And an angular position beta j And constructing a third reference plane, and determining the axial distance between the first plane (7) to be measured and the second plane (8) to be measured according to the intersection point coordinates of the third reference plane and the third direction.
2. The engine axial distance measurement method according to claim 1, wherein the utilization distance U i And an angular position alpha i Constructing the second reference plane includes:
distance of U i And an angular position alpha i Performing data fitting through a least square equation to obtain a fitting plane equation of the second reference plane so as to represent the second reference plane; and/or
The utilization distance W j And an angular position beta j Constructing the third reference plane includes:
distance W of j And an angular position beta j And carrying out data fitting through a least square equation to obtain a fitting plane equation of the third datum plane so as to represent the third datum plane.
3. The method according to claim 1, characterized in that the distance V from the first reference plane (6) to the second plane (8) to be measured is set j Converting to the three-dimensional coordinate system includes:
-transforming the first reference plane (6) to a matrixDistance V of the second plane (8) to be measured j Conversion into the three-dimensional coordinate system, the transformation matrix and theta 1 And theta 2 Correlation, wherein θ is the angle between the first reference plane (6) and the second reference plane, θ 1 Is the projection angle of the included angle theta in a plane perpendicular to the first direction 2 Is the projection angle of the included angle θ in a plane perpendicular to the second direction.
4. A method of measuring axial distance of an engine according to any one of claims 1-3, characterized in that a plurality of said first measuring holes (11) and a plurality of said second measuring holes (12) are distributed along a first pitch circle (13) and a second pitch circle (14), respectively, said first pitch circle (13) and said second pitch circle (14) being concentric, and the radius of said first pitch circle (13) being larger than the radius of said second pitch circle (14).
5. The engine axial distance measurement method according to claim 4, characterized in that a plurality of the first measurement holes (11) and a plurality of the second measurement holes (12) are arranged in groups, each group including the first measurement holes (11) and the second measurement holes (12) located in the same radial direction.
6. A method of measuring an axial distance of an engine according to any one of claims 1 to 3, wherein the origin of the three-dimensional coordinate system is located on the central axis of the engine.
7. A method of measuring an axial distance of an engine according to any one of claims 1-3, characterized in that the first reference plane (6) is located outside the first plane (7) to be measured and the second plane (8) to be measured in the axial direction.
8. The method according to claim 7, characterized in that the first plane (7) to be measured is a fan casing rear mounting plane, the second plane (8) to be measured is a central transmission gearbox rear mounting plane, and the first reference plane (6) is located behind the fan casing rear mounting plane in the axial direction in the engine intake direction.
9. The engine axial distance measurement method according to claim 8, characterized by further comprising:
during the measurement of the engine axial distance, an axial force is applied to the front end of the central transmission gearbox drive bevel gear (9) to eliminate bearing play in the central transmission gearbox (5).
10. A method of controlling an axial distance of an engine, comprising:
the axial distance measured by the axial distance measuring method according to any one of claims 1 to 9;
calculating an adjustment pad size according to the axial distance, the adjustment pad (3) being located between the compressor rotor (1) and the central transmission gearbox (5), the adjustment pad size = half of the axial distance-bearing axial play-theoretical axial size;
an adjusting pad (3) is arranged according to the adjusting pad size to control the engine axial distance.
11. An engine axial distance measuring device for realizing the axial distance measuring method according to any one of claims 1 to 9, comprising a flat plate, either side of which in the thickness direction thereof serves as the first reference plane (6), and a plurality of the first measuring holes (11) and a plurality of the second measuring holes (12) are provided on the flat plate.
12. The engine axial distance measurement device according to claim 11, characterized in that a plurality of the first measurement holes (11) and a plurality of the second measurement holes (12) are distributed along a first pitch circle (13) and a second pitch circle (14), respectively, the first pitch circle (13) and the second pitch circle (14) being concentric, and the first pitch circle (13) having a radius larger than the second pitch circle (14).
13. The engine axial distance measurement device according to claim 12, wherein a plurality of the first measurement holes (11) and a plurality of the second measurement holes (12) are arranged in groups, each group including the first measurement holes (11) and the second measurement holes (12) located in the same radial direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210115895.8A CN116592811A (en) | 2022-02-07 | 2022-02-07 | Engine axial distance measuring method, control method and measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210115895.8A CN116592811A (en) | 2022-02-07 | 2022-02-07 | Engine axial distance measuring method, control method and measuring device |
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| CN202210115895.8A Pending CN116592811A (en) | 2022-02-07 | 2022-02-07 | Engine axial distance measuring method, control method and measuring device |
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| CN (1) | CN116592811A (en) |
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- 2022-02-07 CN CN202210115895.8A patent/CN116592811A/en active Pending
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