CN103983413A - Method for drop test for verifying buffer performance of undercarriage - Google Patents
Method for drop test for verifying buffer performance of undercarriage Download PDFInfo
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- CN103983413A CN103983413A CN201410154200.2A CN201410154200A CN103983413A CN 103983413 A CN103983413 A CN 103983413A CN 201410154200 A CN201410154200 A CN 201410154200A CN 103983413 A CN103983413 A CN 103983413A
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Abstract
The invention belongs to the field of undercarriage drop tests and relates to a method for a drop test for verifying the buffer performance of an undercarriage of a movable platform. The method is characterized in that the requirement for drop test design of the undercarriage of the movable platform is stipulated. The method has the advantages that when the method is used for designing the undercarriage drop test, the buffer performance of the undercarriage of the movable platform can be correctly and fully verified and a conclusion showing whether the buffer performance of the undercarriage is qualified or not is given; the method is applied to design of the undercarriage drop test of one movable platform and the effectiveness of the method is verified by the undercarriage drop test and a flight test.
Description
Technical field
The invention belongs to Aircraft Landing Gear Drop Test field, relate to a kind of drop-test method of mobile platform Design of Aircraft Landing Gears checking.
Background technology
For the undercarriage development of aircraft, landing gear drop test is the main method whether checking undercarriage buffer system performance meets designing requirement, is that aircraft carries out the demonstration test project that first-fly and design typification must complete.At present, the domestic landing gear drop test for mobile platform aircraft there is no ripe verification experimental verification project and method.National military standard specification is the test design foundation of land airplane landing gear drop test, but does not wherein explicitly point out for the Aircraft Landing Gear Drop Test on mobile platform the content and the method that need checking.Therefore, need to carry out the Aircraft Landing Gear Drop Test method for designing research on mobile platform, a kind of drop-test method correctly, that comprehensively Design of Aircraft Landing Gears is verified is proposed, by adopting the checking of the method, can provide the Design of Aircraft Landing Gears design conclusion on mobile platform.
Summary of the invention
The present invention proposes a kind of drop-test method of mobile platform undercarriage buffer system performance verification, use the method to carry out Aircraft Landing Gear Drop Test design, can verify Design of Aircraft Landing Gears correctly, comprehensively, provide the whether qualified conclusion (of pressure testing) of Design of Aircraft Landing Gears on mobile platform.
A drop-test method for Design of Aircraft Landing Gears checking, is characterized in that specifying drop-test project and the checking requirement of mobile platform undercarriage, comprises following content: the first, and testpieces and drop test facility requirement
Testpieces is undercarriage, and the charge pressure of tire should comprise that platform uses and continental rise uses two states.Wheel touches platform surface should be able to Simulated Service Environment:
A) platform uses---and steel plate mobile platform road face rubbing characteristics, thickness δ >=10mm can be simulated in surface;
B) testing table wheel touches platform surface check cable should be able to be installed, and falls the situation on check cable for simulating wheel;
C) continental rise uses---normal concrete table top.
The second, pilot project planning
Pilot project should determine the load condition that gliding angle landing (TB) and mobile platform block landing (CB) three kinds by conventional flat landings (LB) of wafing in continental rise airport, continental rise training place and be tested.
For the situation of each classification, carry out respectively the test of Design Landing Weight design maximum rate of sinking situation, the test of Design Landing Weight multivariate border rate of sinking situation and the test of limit landing weight design rate of sinking situation, complete examination Aircraft Main undercarriage absorbs the situation of merit, checks the revesal retardation efficiency of buffering piston bar simultaneously.Wheel should be with going to regulation landing horizontal velocity.
Repeatedly drop-test and performance test are used same testpieces.Repeatedly drop-test at least comprises " test of CB item Design Landing Weight design maximum rate of sinking " and " test of TB item Design Landing Weight design maximum rate of sinking " two kinds of situations, and when test, imitative liter, wheel are not with and are turned; Every through 500 inputs, should carry out parameter measurement, to check the stability of buffer parameter; Be greater than certain number of times and throw in rear (for example 6000 times), destroy not yet, test stops.
The 3rd, test sequence requirement
1) first carry out the test of LB item, then carry out the test of TB item, finally carry out the test of CB item;
2) test of LB item is only carried out on normal concrete table top; TB item and the test of CB item are only carried out on the steel plate table top of simulation mobile platform road face rubbing characteristics;
3) test that " makes " a line defined diligent for TB item and CB item " design maximum rate of sinking " and LB item, should check at wheel band and turn and be not with turn in the situation that, carriage angle is 0 °, maximum tail-down landing angle and the middle situation that absorbs merit when arbitrarily angled;
4) for the test of TB item and CB item " design maximum rate of sinking " a line defined, also should check at wheel band and turn in situation, carriage angle is 0 °, maximum tail-down landing angle and middle when arbitrarily angled, and main landing gear absorbs the situation of merit while clashing into road face suspension cable;
5), while carrying out CB item " design maximum rate of sinking " test, the rate of sinking (for example: 5m/s) of Ying Cong little starts, and progressively reaches design maximum rate of sinking with the amplification of 0.15m/s, can adjust according to test situation the amplification of rate of sinking;
6) carry out CB item " multivariate border rate of sinking " when test, can carry out situation and interpretation of result according to what test above, the rate of sinking value of this test is suitably adjusted; This test should be landed rate of sinking from maximum, progressively reaches the numerical value of designing requirement with the amplification of 0.1m/s, can adjust according to test situation the amplification of rate of sinking.
The present invention answers simulated aircraft environment for use for Aircraft Landing Gear Drop Test part and experimental enviroment; When Testing items setting, should consider the shock-absorbing capacity examination of aircraft in continental rise, training place and the multiple service condition of mobile platform; The examination order that should progressively increase according to continental rise, training place and mobile platform Impact energy when test sequence design.
Advantage of the present invention is: use the method to carry out the design of mobile platform Aircraft Landing Gear Drop Test, can verify correctly, comprehensively and provide the conclusion (of pressure testing) whether Design of Aircraft Landing Gears is qualified by mobile platform Design of Aircraft Landing Gears.The method has been applied in certain mobile platform Aircraft Landing Gear Drop Test design, and its validity has obtained Aircraft Landing Gear Drop Test and Flight.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
One, testpieces and fall to shaking platform requirement
Testpieces is by paying certain Aircraft Main undercarriage of reception test, as shown in Table 1, parts composition.The initial inflation process pressure of tire: platform uses:
continental rise uses:
wheel touches platform surface should be able to Simulated Service Environment:
Platform uses---and steel plate mobile platform road face rubbing characteristics, thickness δ >=10mm can be simulated in surface;
Continental rise uses---normal concrete table top;
Testing table wheel touches platform surface should be able to install rod iron---the diameter of simulating check cable
Length
Two, pilot project planning
(1) performance test content
The test figure specifying by table 1, check main landing gear buffer system wheel band turn with not with turning the situation that absorbs merit in situation, check the revesal retardation efficiency of buffering piston bar simultaneously.
Table 1 performance test project
(2) drop-test content repeatedly
Repeatedly drop-test and performance test are used same testpieces.Test is divided into I, two stages of II to be carried out, and before each step-by-step test starts, still must again make a service test according to the condition of drop-test repeatedly.
Repeatedly drop-test requires as follows:
1) the I stage tests by the parameter that in table 1, CB item Design Landing Weight " design maximum rate of sinking " a line specifies, when test, imitative liter, wheel are not with and are turned;
2) the I stage every through 500 times throw in, should carry out parameter measurement, to check the stability of buffer parameter;
3) be greater than and throw in rear (containing CB item performance test number of times) for 1500 times, destroy not yet, I step-by-step test stops.
4) the II stage tests by the parameter that in table 1, TB item Design Landing Weight " design maximum rate of sinking " a line specifies, when test, imitative liter, wheel are not with and are turned;
5) the II stage every through 500 times throw in, should carry out parameter measurement, to check the stability of buffer parameter;
6) be greater than and throw in rear (containing TB item performance test number of times) for 1500 times, destroy not yet, II step-by-step test stops.
Three, test sequence requirement
1) first carry out the test of LB item, then carry out the test of TB item, finally carry out the test of CB item;
2) test of LB item is only carried out on normal concrete table top; TB item and the test of CB item are only carried out on the steel plate table top of simulation mobile platform road face rubbing characteristics;
3) test that " makes " a line defined diligent for TB item and CB item " design maximum rate of sinking " and LB item, should check at wheel band and turn and be not with turn in the situation that, and carriage angle absorbs the situation of merit while being 0 °, 6.25 ° and 12.5 °;
4) for the test of TB item and CB item " design maximum rate of sinking " a line defined, also should check at wheel band and turn in situation, when carriage angle is 0 °, 6.25 ° and 12.5 °, main landing gear absorbs the situation of merit while clashing into road face suspension cable, all the other situations all do not require the test of carrying out main landing gear shock road face suspension cable;
5) while carrying out CB item " design maximum rate of sinking " test, should, from the rate of sinking of 5.65m/s, progressively reach 8.0m/s with the amplification of 0.15m/s, can adjust according to test situation the amplification of rate of sinking;
6) carry out CB item " multivariate border rate of sinking " when test, may carry out situation and interpretation of result according to what test above, the rate of sinking value of this test is suitably adjusted; This test should, from the rate of sinking of 8.0m/s, progressively reach the numerical value of designing requirement with the amplification of 0.1m/s, can adjust according to test situation the amplification of rate of sinking.
Claims (1)
1. the drop-test method of a Design of Aircraft Landing Gears checking, it is characterized in that, testpieces and drop test facility require: testpieces is undercarriage, the charge pressure of tire should comprise that platform uses and continental rise uses two states, and the tactile platform of wheel surface should be able to analog platform Service Environment;
Pilot project planning: performance test project should be tested by the load condition that conventional flat landings (LB) of wafing in continental rise airport, continental rise training place determine that gliding angle is landed (TB) and mobile platform blocks landing (CB) three kinds, and repeatedly drop-test should comprise that gliding angle landing (TB) is determined in continental rise training place and mobile platform blocks two kinds of situations of landing (CB);
Test procedure is: first carry out the test of LB item, then carry out the test of TB item, finally carry out the test of CB item; While carrying out CB item " design maximum rate of sinking " and " multivariate border rate of sinking " test, from little rate of sinking, progressively reach the numerical value of designing requirement with the amplification of the amplification of 0.15m/s or 0.1m/s, adjust the amplification of rate of sinking according to test situation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410154200.2A CN103983413A (en) | 2014-04-17 | 2014-04-17 | Method for drop test for verifying buffer performance of undercarriage |
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| CN201410154200.2A CN103983413A (en) | 2014-04-17 | 2014-04-17 | Method for drop test for verifying buffer performance of undercarriage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644347A (en) * | 2017-01-16 | 2017-05-10 | 南京航空航天大学 | Drop test device and drop test method of lander landing gear |
| CN108090258A (en) * | 2017-11-30 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of Flying-wing's undercarriage buffer structure stroke design load determines method |
| CN109738147A (en) * | 2018-10-31 | 2019-05-10 | 中国飞机强度研究所 | A kind of equivalent drop-test method of more pillar undercarriages |
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| CN2419590Y (en) * | 1999-10-28 | 2001-02-14 | 北京航空航天大学 | Device for testing range of buffer for undercarriage unit landing shocks |
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| CN202351007U (en) * | 2011-12-12 | 2012-07-25 | 中联重科股份有限公司 | cab comprehensive test system |
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| CN2419590Y (en) * | 1999-10-28 | 2001-02-14 | 北京航空航天大学 | Device for testing range of buffer for undercarriage unit landing shocks |
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| CN202351007U (en) * | 2011-12-12 | 2012-07-25 | 中联重科股份有限公司 | cab comprehensive test system |
| CN203298971U (en) * | 2013-06-26 | 2013-11-20 | 无锡明珠钢球有限公司 | Combined type steel ball test platform |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644347A (en) * | 2017-01-16 | 2017-05-10 | 南京航空航天大学 | Drop test device and drop test method of lander landing gear |
| CN106644347B (en) * | 2017-01-16 | 2019-04-19 | 南京航空航天大学 | A kind of lander take-off and landing device drop test device and test method |
| CN108090258A (en) * | 2017-11-30 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of Flying-wing's undercarriage buffer structure stroke design load determines method |
| CN108090258B (en) * | 2017-11-30 | 2021-05-25 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for determining structural stroke design value of landing gear buffer of flying wing layout aircraft |
| CN109738147A (en) * | 2018-10-31 | 2019-05-10 | 中国飞机强度研究所 | A kind of equivalent drop-test method of more pillar undercarriages |
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