CN110441064B - Auxiliary hanging pull rod assembling method for optimizing vibration of aircraft engine - Google Patents
Auxiliary hanging pull rod assembling method for optimizing vibration of aircraft engine Download PDFInfo
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- CN110441064B CN110441064B CN201910743300.1A CN201910743300A CN110441064B CN 110441064 B CN110441064 B CN 110441064B CN 201910743300 A CN201910743300 A CN 201910743300A CN 110441064 B CN110441064 B CN 110441064B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention discloses an auxiliary hanging pull rod assembling method for optimizing the vibration of an aero-engine, which can reduce the vibration of the engine caused by the assembling factors of the engine and a test run rack during the ground test and ensure the smooth running of the aero-engine on the ground test run by converting the optimization problem in an infinite range into the optimization problem in a limited range and accurately and quickly determining the optimal solution meeting the requirements by a specific optimization rule.
Description
Technical Field
The invention belongs to the technical field of aircraft engine complete machine tests, and particularly relates to an auxiliary hanging pull rod assembling method for optimizing aircraft engine vibration.
Background
In the process of designing, shaping, using and maintaining the aeroengine, a large number of complete machine tests need to be carried out on a ground test bed. During engine test, the aeroengine vibrates due to factors such as manufacturing assembly errors, unbalanced rotor stress, strong disturbance of airflow and the like. In order to ensure the reliability and the test run safety of the aircraft engine, the vibration of the engine needs to be closely monitored and analyzed in the whole process during the test run.
The engine pedestal mounting mode is that the main mounting joint is fixed by a left bearing pin and a right bearing pin, and the auxiliary mounting joint is fixed by an auxiliary hanging pull rod. At the main mounting joint, the main bearing pin force arm for connecting the engine and the test bed frame is extremely short, belongs to rigid connection, and cannot generate additional vibration. At the auxiliary mounting joint, the engine and the ground rack are in a single pull rod assembly form and a double pull rod assembly form. The installation standard of the auxiliary hanging pull rod is not specific and ambiguous, so that the assembly dispersity is large, the test data repeatability is poor, and the vibration exceeding the limit cannot be distinguished from the assembly factor of an engine and a rack or the engine.
No literature is searched at home and abroad about a method for reducing vibration caused by assembly factors of an engine and a test run rack.
Disclosure of Invention
The purpose of the invention is as follows: the auxiliary hanging pull rod assembling method for optimizing the vibration of the aero-engine is provided, the vibration caused by the assembling factors of the engine and a test bed when the engine is tested on the ground can be reduced, and the smooth test of the aero-engine on the ground is guaranteed.
The technical scheme of the invention is as follows:
an auxiliary hanging pull rod assembling method for optimizing the vibration of an aircraft engine comprises the following steps:
step 1: mounting a vertical pull rod;
step 2: adjusting the movable length of the vertical pull rod within the range allowed by the pitching angle of the engine;
and step 3: within the range allowed by the pitching angle of the engine, carrying out a plurality of vibration tests on the vertical pull rod, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V1 of the engine of the group of tests, and determining the movable length at1+ bt1 of the vertical pull rod at the moment;
and 4, step 4: installing a diagonal draw bar;
and 5: adjusting the movable length of the diagonal draw bar within the range of the up-down adjustment limit state of the diagonal draw bar;
step 6: carrying out a plurality of vibration tests on the diagonal draw bars within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V2 of the test engine of the group, and determining the active length ct1+ dt1 of the diagonal draw bars at the moment;
and 7: disassembling the vertical pull rod and the diagonal pull rod, rotating the mounting seat on the vertical pull rod by 90 degrees, adjusting the movable length of the vertical pull rod again according to the step 2, performing vibration tests on the vertical pull rod again within the range allowed by the pitching angle of the engine, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V3 of the engine of the test, and determining the movable length at2+ bt2 of the vertical pull rod at the moment;
and 8: mounting and adjusting the diagonal draw bars again according to the step 4 and the step 5, performing vibration tests on the diagonal draw bars again within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V4 of the engine of the test, and determining the movable length ct2+ dt2 of the diagonal draw bars at the moment;
and step 9: and comparing the minimum vibration values V1, V2, V3 and V4 under each group of tests to obtain the minimum value of V1, V2, V3 and V4, determining the active length of the vertical pull rod and the active length of the diagonal pull rod at the minimum value, and selecting the active length of the vertical pull rod and the active length of the diagonal pull rod as the optimal assembly active length of the engine.
The vertical pull rod in the step 1 comprises an upper pull rod, a lower pull rod and a threaded sleeve, wherein the upper pull rod and the lower pull rod are respectively connected with two ends of the threaded sleeve, and an upper limit nut and a lower limit nut are respectively arranged on the upper pull rod and the lower pull rod.
The allowable range of the engine pitch angle in the steps 2 and 3 is from the upward limit to the downward limit of the engine pitch angle.
Step 2, adjusting the movable length of the vertical pull rod within the range allowed by the pitching angle of the engine, specifically: from the upward limit to the downward limit of the engine pitch angle, loosening an upper limit nut and a lower limit nut of the vertical pull rod, and rotating the threaded sleeve to respectively extend the upper pull rod and the lower pull rod by a distance a and a distance b, wherein the movable length of the vertical pull rod is a + b;
and 4, the diagonal draw bar comprises an upper draw bar, a lower draw bar and a threaded sleeve, the upper draw bar and the lower draw bar are respectively connected with two ends of the threaded sleeve, and an upper limit nut and a lower limit nut are respectively arranged on the upper draw bar and the lower draw bar.
And 5, the range of the up-down adjusting limit state of the diagonal draw bar is from the tensioning limit state to the supporting limit state of the diagonal draw bar.
And 5, adjusting the movable length of the diagonal draw bar within the up-down adjustment limit state range of the diagonal draw bar, specifically: from the tensioning limit state to the supporting limit state of the diagonal draw bar, an upper limiting nut and a lower limiting nut of the diagonal draw bar are loosened, the threaded sleeve is rotated, so that the upper draw bar and the lower draw bar respectively extend for a distance c and a distance d, and the movable length of the diagonal draw bar is c + d at the moment.
The invention has the beneficial effects that: the method can reduce the vibration of the engine caused by the assembly factors of the engine and a test run rack during ground test and ensure the smooth running of the aircraft engine on the ground test.
Drawings
FIG. 1 is a schematic view of the installation position of a vertical pull rod;
FIG. 2 is a schematic view of the adjustment of the active length of the vertical pull rod;
FIG. 3 is a schematic view of the installation position of the diagonal draw bar;
FIG. 4 is a schematic view of the adjustment of the active length of the diagonal draw bar;
FIG. 5 is a schematic view of the installation base on the vertical pull rod after 90-degree adjustment;
the labels in the figure are: 1. the device comprises an engine, 2 parts of a pre-assembly frame, 3 parts of a vertical pull rod upper mounting base, 4 parts of an upper pull rod, 5 parts of an upper limiting nut, 6 parts of a threaded sleeve, 7 parts of a lower limiting nut, 8 parts of a lower pull rod, 9 parts of an inclined pull rod upper mounting base.
Detailed Description
The invention is further described with reference to the accompanying drawings, and the method for assembling the auxiliary suspension pull rod for optimizing the vibration of the aircraft engine comprises the following steps:
step 1: the perpendicular pull rod of installation, perpendicular pull rod include pull rod 4, lower link 8, swivel nut 6, go up pull rod 4 and lower link 8 and be connected with 6 both ends of swivel nut respectively, go up pull rod 4 and lower link 8 on be provided with stop nut 5 and lower stop nut 7 respectively, specifically be the installation: a vertical pull rod upper mounting seat 3 is mounted on a pre-mounting frame 2 of an engine 1, the upper end of the vertical pull rod is connected with the vertical pull rod upper mounting seat 3, and the lower end of the vertical pull rod is connected with the engine 1.
Step 2: in the range that the engine 1 pitch angle allows, the activity length of adjustment vertical pull rod, the range that the engine 1 pitch angle allows is that the extreme position of pitching is spacing to the extreme position of pitching down of the engine 1 pitch angle, and specific adjustment process is: from the upward limit to the downward limit of the pitch angle of the engine 1, loosening an upper limit nut 5 and a lower limit nut 7 of the vertical pull rod, and rotating a threaded sleeve 6 to respectively extend an upper pull rod 4 and a lower pull rod 8 by a distance a and a distance b, wherein the movable length of the vertical pull rod is a + b;
and step 3: within the range allowed by the pitching angle of the engine 1, carrying out a plurality of vibration tests on the vertical pull rod, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V1 of the test engine of the group, and determining the movable length at1+ bt1 of the vertical pull rod at the moment;
and 4, step 4: the installation draws in a slant pull rod, draws the pull rod to one side and includes pull rod 4, lower link 8, swivel nut 6, goes up pull rod 4 and lower link 8 and is connected with 6 both ends of swivel nut respectively, last pull rod 4 and lower link 8 on be provided with stop nut 7 and lower stop nut 7 respectively, concrete installation is: an upper inclined pull rod mounting seat 9 is mounted on a pre-mounting frame 2 of the engine 1, the upper end of the inclined pull rod is connected with the upper inclined pull rod mounting seat 9, and the lower end of the inclined pull rod is connected with the lower end of the vertical pull rod.
And 5: in the up-down regulation limit state range of the diagonal draw bar, the movable length of the diagonal draw bar is regulated, the up-down regulation limit state range of the diagonal draw bar means that the tension limit state of the diagonal draw bar is changed to the support limit state, and the specific process of regulating the movable length of the diagonal draw bar is as follows: from the tensioning limit state to the supporting limit state of the diagonal draw bar, an upper limiting nut 5 and a lower limiting nut 7 of the diagonal draw bar are loosened, a threaded sleeve 6 is rotated, so that an upper draw bar 4 and a lower draw bar 8 respectively extend for a distance c and a distance d, and the movable length of the diagonal draw bar is c + d at the moment.
Step 6: carrying out a plurality of vibration tests on the diagonal draw bars within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V2 of the test engine of the group, and determining the active length ct1+ dt1 of the diagonal draw bars at the moment;
and 7: disassembling the vertical pull rod and the diagonal pull rod, rotating the mounting seat 3 on the vertical pull rod by 90 degrees, adjusting the movable length of the vertical pull rod again according to the step 2, performing vibration tests on the vertical pull rod again within the range allowed by the pitch angle of the engine 1, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V3 of the engine of the test, and determining the movable length at2+ bt2 of the vertical pull rod at the moment;
and 8: mounting and adjusting the diagonal draw bars again according to the step 4 and the step 5, performing vibration tests on the diagonal draw bars again within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V4 of the engine of the test, and determining the movable length ct2+ dt2 of the diagonal draw bars at the moment;
and step 9: and comparing the minimum vibration values V1, V2, V3 and V4 under each group of tests to obtain the minimum value of V1, V2, V3 and V4, determining the active length of the vertical pull rod and the active length of the diagonal pull rod at the minimum value, and selecting the active length of the vertical pull rod and the active length of the diagonal pull rod as the optimal assembly active length of the engine.
Example (b):
as shown in figure 1, a vertical pull rod is installed, the moving length (a + b value, as shown in figure 2) of the pull rod is adjusted within the limit range of ensuring the pitch angle of the engine 1, the vertical pull rod is subjected to a plurality of vibration tests from the upward limit position to the downward limit position of the pitch 1 elevation angle of the engine, a plurality of vibration values obtained by the tests are compared to find out the minimum vibration value V1 of the engine in the group of tests, and the moving length at1+ bt1 of the vertical pull rod at the moment is determined on the assumption that V1 is 15.37mm/s, wherein a at the momentt1+bt1＝50.59mm；
The active length of the vertical pull rod in the previous step is at1+bt1Mounting and adjusting the movable length (c + d value) of the diagonal draw bar on the basis of the optimal state of 50.59mm, as shown in fig. 4, loosening the upper limit nut 5 and the lower limit nut 7 of the diagonal draw bar from the tensioning limit state (tensioning state) to the supporting limit state (supporting state) of the diagonal draw bar, rotating the screw sleeve 6 to respectively extend the upper draw bar 4 and the lower draw bar 8 by a distance c and a distance d, wherein the movable length of the diagonal draw bar is c + d, performing a plurality of vibration tests on the diagonal draw bar, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V2 of the test engine of the group, wherein the V2 is 11.78mm/s, and determining the movable length ct1+ dt1 of the diagonal draw bar at this time to be 49.24 mm;
disassembling the vertical pull rod and the diagonal pull rod, rotating the mounting seat 3 on the vertical pull rod by 90 degrees, adjusting the movable length of the vertical pull rod again according to the method in the step 2, performing vibration tests on the vertical pull rod again within the range allowed by the pitch angle of the engine 1, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V3 of the engine in the test, and determining the movable length at2+ bt2 of the vertical pull rod at the moment; at this point V3 is 15.92mm/s, and at this point the vertical tie bar activity gauge is 49.97mm, at2+ bt 2.
On the basis of the optimal state that the active length of the vertical pull rod in the previous step is at2+ bt 2-49.97 mm, the active length of the diagonal pull rod is installed and adjusted, so that the diagonal pull rod is respectively in a tensioning state and a supporting state to carry out a comparative test, and the comparative test result shows that when the diagonal pull rod is in the supporting state, the vibration value of the engine is optimal, at the moment, V4 is 15.28mm/s, and at the moment, the active length of the diagonal pull rod is ct2+ dt 2-49.73 mm.
Comparing the above test results, it was found that the minimum value of V1, V2, V3 and V4 was determined to be V1, which was only 11.78mm/s, and the active lengths of the vertical tie bar and the diagonal tie bar were respectively 50.59mm and 49.24mm, which were the active lengths in the optimum assembled state of the engine.
The method can reduce the vibration of the engine caused by the assembly factors of the engine and the test stand during the ground test and ensure the smooth running of the aircraft engine on the ground test by converting the optimization problem in an infinite range into the optimization problem in a finite range and accurately and quickly determining the optimal solution meeting the requirements by using a specific optimization rule.
Claims (5)
1. An auxiliary hanging pull rod assembling method for optimizing the vibration of an aircraft engine is characterized by comprising the following steps of: the method comprises the following steps:
step 1: mounting a vertical pull rod; the vertical pull rod comprises an upper pull rod (4), a lower pull rod (8) and a threaded sleeve (6), the upper pull rod (4) and the lower pull rod (8) are respectively connected with two ends of the threaded sleeve (6), and an upper limiting nut (5) and a lower limiting nut (7) are respectively arranged on the upper pull rod (4) and the lower pull rod (8);
step 2: in the range allowed by the pitching angle of the engine (1), adjusting the movable length of the vertical pull rod, specifically from the upward limit to the downward limit of the pitching angle of the engine (1), loosening the upper limit nut (5) and the lower limit nut (7) of the vertical pull rod, and rotating the threaded sleeve (6) to respectively extend the upper pull rod (4) and the lower pull rod (8) by a distance a and a distance b, wherein the movable length of the vertical pull rod is a + b;
and step 3: within the range allowed by the pitching angle of the engine (1), carrying out vibration tests on the vertical pull rod for a plurality of times, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V1 of the test engine of the group, and determining the movable length at1+ bt1 of the vertical pull rod at the moment;
and 4, step 4: installing a diagonal draw bar; the diagonal draw bar comprises an upper draw bar (4), a lower draw bar (8) and a threaded sleeve (6), the upper draw bar (4) and the lower draw bar (8) are respectively connected with two ends of the threaded sleeve (6), and an upper limiting nut (5) and a lower limiting nut (7) are respectively arranged on the upper draw bar (4) and the lower draw bar (8);
and 5: in the range of the up-down adjustment limit state of the diagonal draw bar, the movable length of the diagonal draw bar is adjusted, specifically, the upper limit nut (5) and the lower limit nut (7) of the diagonal draw bar are loosened from the tensioning limit state to the supporting limit state of the diagonal draw bar, the threaded sleeve (6) is rotated, so that the upper draw bar (4) and the lower draw bar (8) respectively extend for a distance c and a distance d, and the movable length of the diagonal draw bar is c + d at the moment;
step 6: carrying out a plurality of vibration tests on the diagonal draw bars within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V2 of the test engine of the group, and determining the active length ct1+ dt1 of the diagonal draw bars at the moment;
and 7: disassembling the vertical pull rod and the diagonal pull rod, rotating the mounting seat (3) on the vertical pull rod by 90 degrees, adjusting the movable length of the vertical pull rod again according to the step 2, performing vibration tests on the vertical pull rod again within the range allowed by the pitch angle of the engine (1), comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V3 of the engine in the test, and determining the movable length at2+ bt2 of the vertical pull rod at the moment;
and 8: mounting and adjusting the diagonal draw bars again according to the step 4 and the step 5, performing vibration tests on the diagonal draw bars again within the range of the up-down adjustment limit state of the diagonal draw bars, comparing a plurality of vibration values obtained by the tests, finding out the minimum vibration value V4 of the engine of the test, and determining the movable length ct2+ dt2 of the diagonal draw bars at the moment;
and step 9: and comparing the minimum vibration values V1, V2, V3 and V4 under each group of tests to obtain the minimum value of V1, V2, V3 and V4, determining the active length of the vertical pull rod and the active length of the diagonal pull rod at the minimum value, and selecting the active length of the vertical pull rod and the active length of the diagonal pull rod as the optimal assembly active length of the engine.
2. The method for assembling the auxiliary suspension pull rod for optimizing the vibration of the aircraft engine according to claim 1, wherein the method comprises the following steps: step 1, the installation of the vertical pull rod specifically comprises the following steps: a vertical pull rod upper mounting seat (3) is mounted on a pre-mounting frame (2) of an engine (1), the upper end of the vertical pull rod is connected with the vertical pull rod upper mounting seat (3), and the lower end of the vertical pull rod is connected with the engine (1).
3. The method for assembling the auxiliary suspension pull rod for optimizing the vibration of the aircraft engine according to claim 1, wherein the method comprises the following steps: and (3) the allowable range of the pitch angle of the engine (1) in the steps 2 and 3 is from the upward limit position to the downward limit position of the pitch angle of the engine (1).
4. The method for assembling the auxiliary suspension pull rod for optimizing the vibration of the aircraft engine according to claim 1, wherein the method comprises the following steps: step 4, the installation of the diagonal draw bar specifically comprises the following steps: an upper mounting seat (9) of a diagonal draw bar is mounted on a pre-mounting frame (2) of an engine (1), the upper end of the diagonal draw bar is connected with the upper mounting seat (9) of the diagonal draw bar, and the lower end of the diagonal draw bar is connected with the lower end of a vertical draw bar.
5. The method for assembling the auxiliary suspension pull rod for optimizing the vibration of the aircraft engine according to claim 1, wherein the method comprises the following steps: and 5, the range of the up-down adjusting limit state of the diagonal draw bar is from the tensioning limit state to the supporting limit state of the diagonal draw bar.
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| CN201910743300.1A CN110441064B (en) | 2019-08-13 | 2019-08-13 | Auxiliary hanging pull rod assembling method for optimizing vibration of aircraft engine |
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| CN201910743300.1A CN110441064B (en) | 2019-08-13 | 2019-08-13 | Auxiliary hanging pull rod assembling method for optimizing vibration of aircraft engine |
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| CN110441064B true CN110441064B (en) | 2021-06-22 |
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