CN117326095A - Equivalent treatment method for hydrodynamic load of amphibious aircraft - Google Patents
Equivalent treatment method for hydrodynamic load of amphibious aircraft Download PDFInfo
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- CN117326095A CN117326095A CN202311524237.5A CN202311524237A CN117326095A CN 117326095 A CN117326095 A CN 117326095A CN 202311524237 A CN202311524237 A CN 202311524237A CN 117326095 A CN117326095 A CN 117326095A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 230000004044 response Effects 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 230000001052 transient effect Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000005452 bending Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 2
- 238000003672 processing method Methods 0.000 abstract description 8
- 230000003068 static effect Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Aviation & Aerospace Engineering (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses an amphibious aircraft hydrodynamic load equivalent processing method. Loading concentrated hydrodynamic load by using a dynamic model of the amphibious aircraft to carry out transient response analysis, so as to obtain overload curves at all stations of the aircraft; calculating the internal force of the airplane body by using the overload of each station in each moment in the water-spreading process of the amphibious airplane, and screening to find out the moment with the most serious loading; calculating the water pressure born by each frame by using the stall speed of the aircraft and the inclined lift angle parameters at the station position of the ship bottom frame; calculating the pressure lower limit value of each corresponding ship bottom frame according to the hydrodynamic load loading proportion corresponding to the most serious moment of loading; and optimizing the water load acting area and the water load applied by each frame in the test until the total force of the water load applied by each frame is consistent with the concentrated water load applied at the moment of the most serious loading. The invention solves the technical problem that the test load processing method under the static load working condition is not suitable for the dampening working condition.
Description
Technical Field
The invention belongs to the technical field of airplane strength tests, and particularly relates to an amphibious airplane hydrodynamic load equivalent treatment method.
Background
The full-aircraft static test is a main means for checking the strength of the aircraft, and simulates various conditions of real use of the aircraft by applying static load to the aircraft structure, so as to verify the bearing capacity and safety margin of the aircraft. The water working condition is a dynamic process, and the water load in the water process is influenced by the speed, weight, wavelength of wave water surface and the like of the airplane, so that the water working condition is very complex. From design load to test load, the dampening conditions are different from the static load conditions. The test load treatment of static load working condition is that the design load is divided on adjacent loading points by a lever ratio method, and the resultant force, direction and action point of the division load are ensured to be consistent with the design load before division load. However, in CCAR-25-R4, 25.525 (b) specifies that "when a load is applied at a load factor specified in 25.527, the load can be distributed throughout the hull or the bottom of the main buoy with a pressure not less than that specified in 25.533 (b) (to avoid excessive local shear loads and bending moments at the site of water load application). Therefore, the test load treatment method of the static load working condition is not suitable for the dampening working condition.
Disclosure of Invention
The purpose of the invention is that: provides an equivalent treatment method for the hydrodynamic load of an amphibious aircraft. The invention solves the technical problem that the test load processing method under the static load working condition is not suitable for the dampening working condition.
The technical scheme of the invention is as follows: an amphibious aircraft hydrodynamic load equivalent treatment method comprises the following steps:
step 1: loading concentrated hydrodynamic load by using a dynamic model of the amphibious aircraft to carry out transient response analysis, so as to obtain overload curves at all stations of the aircraft;
step 2: calculating the internal force of the airplane body by using the overload of each station in each moment in the water-spreading process of the amphibious airplane, and screening to find out the moment with the most serious loading;
step 3: calculating the water pressure born by each frame by using the stall speed of the aircraft and the inclined lift angle parameters at the station position of the ship bottom frame;
step 4: calculating the pressure lower limit value of each corresponding ship bottom frame according to the hydrodynamic load loading proportion corresponding to the most serious moment of loading;
step 5: and optimizing the water load acting area and the water load applied by each frame in the test until the resultant force of the water load applied by each frame is consistent with the concentrated water load applied at the moment of the most serious loading, and obtaining the final equivalent test load.
In the step 1 of the amphibious aircraft hydrodynamic load equivalent processing method, when transient response analysis is carried out, the wave height, the length-to-height ratio, the loading period and the encountering frequency factors of sea waves need to be considered at the same time when the hydrodynamic load is loaded.
In the step 2 of the amphibious aircraft hydrodynamic load equivalent treatment method, the screening is based on the magnitude of internal forces of the aircraft body, wherein the internal forces comprise shearing forces and bending moments of the aircraft body.
In the step 4 of the amphibious aircraft hydrodynamic load equivalent processing method, the lower limit value of the pressure applied by each frame at the bottom of the ship at the moment when the load is most serious is obtained by multiplying the water load loading proportion at the moment by the water pressure calculated in the step 3.
In the step 5 of the amphibious aircraft hydrodynamic load equivalent treatment method, the water load applied by each frame is the lower pressure limit value calculated in the step 4.
In the step 5 of the amphibious aircraft hydrodynamic load equivalent treatment method, the water load acting area in the test is optimized, namely the number of the ship bottom frames loaded in the test is adjusted.
In the step 5 of the amphibious aircraft hydrodynamic load equivalent processing method, the magnitude of the water load resultant force applied by each frame passes through the center of gravity of the aircraft.
In the step 1 of the amphibious aircraft hydrodynamic load equivalent treatment method, the concentrated hydrodynamic load is derived from 25.527 in CCAR-25-R4.
The invention has the advantages that: according to the invention, the test loading load equivalent to the designed hydrodynamic load is obtained through the cooperation of the steps 3, 4 and 5, the technical problem that the test load processing method under the static load working condition is not suitable for the hydrodynamic working condition is effectively solved, and the flow is clear and clear. Meanwhile, the method provided by the invention has the advantages of few steps, simplicity in operation and high data recycling rate in the iterative process, can effectively shorten the test design period, improves the test efficiency, and has a larger practical application value.
Drawings
Figure 1 is a water load resultant force increase history of the amphibious aircraft of example 1 when subjected to a single wave on the water surface;
FIG. 2 is a schematic representation of an aircraft dynamics model in example 1;
FIG. 3 is a graph showing the acceleration response curves obtained by transient response analysis of the kinetic model in example 1;
FIG. 4 is a schematic diagram of the severe conditions screened for bending moment in example 1;
fig. 5 is a schematic diagram of the distribution pressure of the bottom of the ship.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention. The present invention is in no way limited to any particular arrangement and method set forth below, but rather covers any adaptations, alternatives, and modifications of structure, method, and device without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in detail in order not to unnecessarily obscure the present invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other, and the embodiments may be referred to and cited with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1. As shown in fig. 1-5, which is the course of the increase in water load force when an aircraft encounters a single wave on the water surface, the increase in overload time is 0.065 seconds.
The invention relates to an amphibious aircraft hydrodynamic load equivalent treatment method, which comprises the following steps of:
step one, determining calculation parameters such as excitation water load, wave height, length to height ratio of sea waves, half-wave loading time, loading period, encountering frequency, damping, safety coefficient and the like;
loading a hydrodynamic load on a dynamic model of the amphibious aircraft for transient response analysis to obtain overload curves of all stations of the aircraft, as shown in fig. 3;
and thirdly, calculating the internal force of the airplane body by using the overload of each station in each moment in the water-spreading process of the amphibious airplane, and screening to find out the moment with the most serious loading. As shown in fig. 4;
step four, calculating the pressure lower limit value of each frame of the ship bottom by utilizing parameters such as stall speed of the airplane, a slope angle at the station of the ship bottom frame and the like;
step five, calculating the pressure value of each corresponding ship bottom frame according to the hydrodynamic load loading proportion corresponding to the most serious moment of loading;
and step six, optimizing a water load acting area in the test until the magnitude of the resultant force of the applied water load is consistent with the magnitude of the concentrated water load borne by the most severe working condition, and the resultant force passes through the center of gravity of the aircraft.
Finally, the equivalent treatment of the water dynamic load is completed, and the test loading load of the water working condition is obtained.
Example 2. Transient response analysis is carried out on a dynamic model of the amphibious aircraft under a specified concentrated hydrodynamic load, so that overload of each station of the aircraft at each moment in the water process is obtained, the worst moment is screened out, and the lower pressure limit value of each frame of the ship bottom is obtained according to the loading proportion of the hydrodynamic load at the worst moment; the water load acting area is optimized, so that the resultant force of the applied water load is consistent with the concentrated water load borne by the aircraft at the worst moment, and the resultant force passes through the center of gravity of the aircraft. And finally, the equivalent treatment of the hydrodynamic load from the design load to the test loading load is completed.
According to the equivalent treatment method of the amphibious aircraft hydrodynamic load, the specified concentrated hydrodynamic load is derived from 25.527 in CCAR-25-R4.
According to the equivalent treatment method of the amphibious aircraft hydrodynamic load, the dynamics model corrected by the GVT test is subjected to transient response analysis after loading the specified concentrated hydrodynamic load, overload conditions of each component structure at each moment in the water process are obtained, and shear bending moment conditions of the aircraft body at each moment are compared, so that screening is carried out.
According to the equivalent processing method of the amphibious aircraft water dynamic load, the lower limit value of the pressure applied by each frame of the ship bottom corresponding to the maximum water load when the aircraft is in water is calculated according to a formula regulated by 25.533 (b) in CCAR-25-R4, and the pressure value of each frame of the ship bottom at the worst moment is determined by multiplying the loading proportion of the water load at the moment by the lower limit value of the pressure.
According to the equivalent treatment method of the amphibious aircraft hydrodynamic load, the water load acting area in the test is optimized, namely the number of ship bottom frames loaded in the test is adjusted, so that the resultant force of the applied water load is consistent with the concentrated water load borne by the worst working condition, and the resultant force passes through the gravity center of the aircraft.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. The scope of the invention should therefore be determined by the following claims.
Claims (8)
1. The water dynamic load equivalent treatment method for the amphibious aircraft is characterized by comprising the following steps of:
step 1: loading concentrated hydrodynamic load by using a dynamic model of the amphibious aircraft to carry out transient response analysis, so as to obtain overload curves at all stations of the aircraft;
step 2: calculating the internal force of the airplane body by using the overload of each station in each moment in the water-spreading process of the amphibious airplane, and screening to find out the moment with the most serious loading;
step 3: calculating the water pressure born by each frame by using the stall speed of the aircraft and the inclined lift angle parameters at the station position of the ship bottom frame;
step 4: calculating the pressure lower limit value of each corresponding ship bottom frame according to the hydrodynamic load loading proportion corresponding to the most serious moment of loading;
step 5: and optimizing the water load acting area and the water load applied by each frame in the test until the resultant force of the water load applied by each frame is consistent with the concentrated water load applied at the moment of the most serious loading, and obtaining the final equivalent test load.
2. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 1, when transient response analysis is performed, the wave height, the length-to-height ratio, the loading period and the encountering frequency factors of the sea waves need to be considered simultaneously when the water dynamic load is loaded.
3. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in the step 2, the screening is based on the magnitude of the internal force of the machine body, wherein the internal force comprises the shearing force and the bending moment of the machine body.
4. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 4, the lower limit value of the pressure applied by each frame at the bottom of the ship at the moment when the load is the most serious is obtained by multiplying the water load loading proportion at the moment by the water pressure calculated in step 3.
5. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 5, the water load applied by each frame is the lower pressure limit calculated in step 4.
6. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 5, optimizing the water load acting area in the test, namely adjusting the number of the ship bottom frames loaded in the test.
7. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 5, the magnitude of the water load force applied by each frame is passed through the center of gravity of the aircraft.
8. The amphibious aircraft hydrodynamic load equivalent treatment method according to claim 1, wherein: in step 1, the concentrated hydrodynamic load is derived from CCAR-25-R4, clause 25.527.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311524237.5A CN117326095B (en) | 2023-11-15 | 2023-11-15 | Equivalent treatment method for hydrodynamic load of amphibious aircraft |
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| CN202311524237.5A CN117326095B (en) | 2023-11-15 | 2023-11-15 | Equivalent treatment method for hydrodynamic load of amphibious aircraft |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5511430A (en) * | 1993-12-06 | 1996-04-30 | Aerospatiale Societe Nationale Industrielle | Method and device for detecting that the design loads of an aircraft have been exceeded |
| CN109612684A (en) * | 2018-12-14 | 2019-04-12 | 中国特种飞行器研究所 | Water surface flying device model dampening load test device and method under fixed pose |
| CN110750890A (en) * | 2019-10-12 | 2020-02-04 | 中航通飞研究院有限公司 | Method for calculating hydrostatic test load of amphibious aircraft |
| CN112706944A (en) * | 2020-12-11 | 2021-04-27 | 中国特种飞行器研究所 | Wave water surface model water-landing test device and method |
| CN114357878A (en) * | 2021-12-30 | 2022-04-15 | 中国特种飞行器研究所 | Method for predicting water surface load of typical section of amphibious aircraft |
-
2023
- 2023-11-15 CN CN202311524237.5A patent/CN117326095B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5511430A (en) * | 1993-12-06 | 1996-04-30 | Aerospatiale Societe Nationale Industrielle | Method and device for detecting that the design loads of an aircraft have been exceeded |
| CN109612684A (en) * | 2018-12-14 | 2019-04-12 | 中国特种飞行器研究所 | Water surface flying device model dampening load test device and method under fixed pose |
| CN110750890A (en) * | 2019-10-12 | 2020-02-04 | 中航通飞研究院有限公司 | Method for calculating hydrostatic test load of amphibious aircraft |
| CN112706944A (en) * | 2020-12-11 | 2021-04-27 | 中国特种飞行器研究所 | Wave water surface model water-landing test device and method |
| CN114357878A (en) * | 2021-12-30 | 2022-04-15 | 中国特种飞行器研究所 | Method for predicting water surface load of typical section of amphibious aircraft |
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| CN117326095B (en) | 2024-07-23 |
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