Aircraft bulk cargo arresting net static test loading method
By designing a simulated fake parts of bulk cargo with sufficient strength and stiffness, the problem of difficulty in applying test loads in the static test of aircraft bulk cargo barrier network is solved, and high-precision test loading and barrier network protection are achieved.
Patent Information
- Application Number
- CN202310947042.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-28
- Publication Date
- 2025-02-14
AI Technical Summary
When conducting static tests of aircraft bulk cargo barrier networks, the airline bulk cargo is small in size and has weak strength and stiffness, and cannot provide sufficient strength and stiffness to fix the test loading fixtures, and cannot withstand huge test loads, resulting in the inability to pass through real bulk The cargo is loaded for trial.
A bulk cargo simulated fake part is designed with sufficient strength and stiffness to maintain no damage and deformation during the test loading process, and to protect the barrier mesh belt. The front end face of the simulated fake part is the same as the front end face of the bulk cargo. The simulated fake is composed of six independent loading units, connected to the loading actuator through a test loading fixture to apply the test load.
The effective loading of the static test of the aircraft bulk cargo barrier network is achieved, ensuring high test loading accuracy, protecting the barrier network grid, and ensuring the smooth progress of the test.
Smart Images
Figure CN119429161A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of aircraft structure strength test, and relates to a test loading method for a static test of a bulk cargo arresting net. Background Art
[0002] At present, when designing cargo aircraft loaded with bulk cargo, multiple soft cargo arresting nets are usually used to separate the bulk cargo in different loading areas of the aircraft's main cargo hold. When the aircraft makes an emergency landing, each cargo arresting net is subjected to the forward 9g overload inertia load generated by all the bulk cargo in the loading area behind it.
[0003] The strength of bulk cargo arresting nets and fuselage structures needs to be verified through static tests. The test load is the inertial load generated by the 9g overload of all cargoes forward. This load is usually very large and can reach several tons or even dozens of tons. Therefore, when conducting static tests on arresting nets and fuselage structures, a prominent problem is that most aviation bulk cargoes are small-volume, weak-strength and weak-rigidity bulk packages that cannot provide sufficient strength and rigidity to fix the test loading fixtures, let alone withstand the huge loads during the test loading process. Therefore, the purpose of test loading cannot be achieved through real bulk cargoes. The solution to this problem is to design a bulk cargo simulation dummy to apply the test load. The simulation dummy should have the following four basic characteristic functions:
[0004] 1) The simulation dummy should be able to provide installation space for the test loading equipment;
[0005] 2) The simulated dummy should have sufficient strength and rigidity, and should not be damaged or deformed excessively during the test loading process, which would affect the application of the test load;
[0006] 3) The simulated dummy should be able to protect the barrier net belt and the belt should not be worn or cut off during the test loading process;
[0007] 4) The front end face of the simulated dummy should be the same shape as the front end face of the bulk cargo. Summary of the invention
[0008] The purpose of the present invention is to provide a test loading method for a static test of a bulk cargo barrier net. The technical solution of the present invention is to design a bulk cargo simulation dummy to replace the bulk cargo in applying the test load.
[0009] A method for loading a bulk cargo arresting net for a static test of an aircraft, characterized in that it comprises the following contents: 1) designing a bulk cargo loading dummy, the bulk cargo loading dummy being a rigid structure, the shape of the rigid structure meeting the requirements of an aircraft cargo hold, being bilaterally symmetrical with the aircraft symmetry plane as the symmetry plane, the lower surface of the rigid structure being a plane, which can be placed on the floor of the aircraft, and the side surface of one end of the rigid structure being a loading surface for a static test; 2) designing an aircraft loading cargo hold, one end of which is fixed on a test frame on one side, and a bulk cargo arresting net is provided at the other end of the aircraft loading cargo hold; 3) placing the bulk cargo loading dummy in the aircraft loading cargo hold, so that the loading surface of the cargo loading dummy is fitted on the bulk cargo arresting net, the loading surface is connected to the front end of a loading actuator, and the rear end of the loading actuator is fixed on the test frame on the other side; 4) applying tension to the bulk cargo loading dummy through the loading actuator, and the bulk cargo loading dummy is reversely arrested by the bulk cargo arresting net, thereby achieving the purpose of the static test of the aircraft bulk cargo arresting net.
[0010] The static test loading method of the aircraft bulk cargo arresting net is characterized in that the bulk cargo loading dummy is composed of six independent loading units; the six loading units are arranged symmetrically with the aircraft symmetry plane as the symmetry plane, and are divided into three layers from top to bottom, each loading unit is welded by a steel truss structure and a front end steel plate to form a rigid structure, the front end face of each loading unit is the loading face, and a loading through hole is designed at the centroid of the steel plate of the loading face to fix the test loading fixture.
[0011] The static test loading method of the aircraft bulk cargo arresting net is characterized in that three parallel test loading fixtures are fixed on the loading surface of the bulk cargo loading dummy, and the three parallel test loading fixtures are respectively fixed on the loading through holes of the two loading units of the upper layer, the middle layer and the lower layer, and a loading joint is provided at the center of each test loading fixture, and each loading joint is connected to the telescopic end of a loading actuator.
[0012] The static test loading method of the aircraft bulk cargo arresting net is characterized in that the loading surface of the bulk cargo loading dummy is a plane and its edge is an arc chamfer.
[0013] A bulk cargo loading dummy for an aircraft, characterized in that the bulk cargo loading dummy is a rigid structure, the shape of the rigid structure meets the requirements of an aircraft cargo hold, is bilaterally symmetrical with the aircraft symmetry plane as the symmetry plane, the lower surface of the rigid structure is a plane and can be placed on the floor of the aircraft, and one end side of the rigid structure is a loading surface for a static test.
[0014] The aircraft bulk cargo loading dummy is characterized in that the bulk cargo loading dummy is composed of six independent loading units; the six loading units are arranged symmetrically with the aircraft symmetry plane as the symmetry plane, and are divided into three layers from top to bottom, each loading unit is welded by a steel truss structure and a front end steel plate to form a rigid structure, the front end face of each loading unit is the loading face, and a loading through hole is designed at the centroid of the steel plate of the loading face to fix the test loading fixture.
[0015] The present invention has the advantages and beneficial effects. The present invention provides an effective test loading method for static testing of cargo arresting nets and fuselage connection structures of cargo aircraft loaded with bulk cargo. The loading accuracy is high, and the soft mesh belt of the arresting net is effectively protected, which can ensure the smooth progress of the test loading. The present invention can be widely used in strength tests of arresting nets and fuselage structures of cargo aircraft. With the rapid development of the country's air cargo industry, the present invention can adapt to the continuously increasing requirements for aircraft structure strength test loading, and has broad application and promotion prospects in the field of aircraft structure strength test. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the dummy structure for loading bulk cargo into aircraft.
[0017] Figure 2 Schematic diagram of the aircraft loading cargo hold structure.
[0018] Figure 3 Schematic diagram of the loading method for static test of aircraft bulk cargo arresting net.
[0019] Explanation of numbers in the figure: 1 bulk cargo loading dummy, 2 loading surface, 3 loading through hole, 4 loading cargo hold, 5 bottom plate, 6 barrier net, 7 loading fixture, 8 connecting plate, 9 left test frame, 10 right test frame, 11 loading actuator. DETAILED DESCRIPTION
[0020] Referring to the attached drawings, in order to effectively load bulk cargo in the static test of the aircraft bulk cargo arresting net, the bulk cargo loading dummy designed by the present application is as follows: Figure 1As shown, the bulk cargo loading dummy 1 is composed of six independent loading units; the six loading units are arranged symmetrically with the aircraft symmetry plane as the symmetry plane, and are divided into three layers from top to bottom. Each loading unit is welded by a steel truss structure and a front end steel plate to form a rigid structure. The front end face of each loading unit is a loading surface 2. A loading through hole 3 is designed at the centroid of the steel plate of the loading surface 2 to fix the test loading fixture 7. The bulk cargo loading dummy 1 in the embodiment is composed of six independent loading units to form an integral rigid part. It is for the convenience of processing and transportation. It can also be an integral rigid loading unit. It must be emphasized that the bulk cargo loading dummy is a rigid structure. The shape of the rigid structure meets the requirements of the aircraft cargo hold. It is symmetrical with the aircraft symmetry plane as the symmetry plane. The lower surface of the rigid structure is a plane and can be placed on the floor 5 of the aircraft cargo hold. One end side of the rigid structure is the loading surface 2 of the static test.
[0021] At the same time, the static test of the aircraft bulk cargo arresting net also requires the design of an aircraft loading cargo hold 4, in which there is a cargo-bearing floor 5, a connecting plate 8 is provided at one end of the loading cargo hold 4, and a bulk cargo arresting net 6 is provided at the other end of the loading cargo hold 4. Figure 2 shown.
[0022] When carrying out a loading test, a loading test frame is required. The test frame in the embodiment includes a left test frame 9 and a right test frame 10. The test frames are rigid support column structures, which are used to fix the loading cargo hold 4 and the loading actuator 11 respectively. The loading cargo hold 4 is fixed to the left test frame 9 through its connecting plate, and the bulk cargo loading dummy 1 is placed in the aircraft loading cargo hold 4, so that the loading surface 2 of the cargo loading dummy 1 fits on the bulk cargo arresting net 6, and the loading surface 2 is connected to the front end of the loading actuator 11 through the test loading fixture 7, and the rear end of the loading actuator 11 is fixed to the right test frame 10; a tensile force is applied to the bulk cargo loading dummy 1 through the loading actuator 11, and the bulk cargo loading dummy 1 is reversely arrested by the bulk cargo arresting net 6, so as to achieve the purpose of the static test of the aircraft bulk cargo arresting net.
[0023] In order to make the bulk cargo loading dummy 1 truly simulate the loading condition of bulk cargo on an airplane, three parallel test loading fixtures 7 are fixed on the loading surface 2 of the bulk cargo loading dummy 1 in the embodiment, and the three parallel test loading fixtures 7 are respectively fixed on the loading through holes 2 of the two loading units of the upper layer, the middle layer and the lower layer. A loading joint is provided at the center of each test loading fixture 7, and each loading joint is connected to the telescopic end of a loading actuator cylinder 11. The axial directions of the three loading actuator cylinders 11 are located on the same longitudinal plane, and the cylinder bodies of the three loading actuator cylinders 11 are respectively fixed on the right test frame 10.
[0024] In order to prevent the corners of the bulk cargo loading dummy 1 from causing wear to the bulk cargo arresting net during the loading test, the loading surface 2 of the bulk cargo loading dummy 1 in the embodiment is a plane, and its edge is an arc chamfer.
Claims
1. A static test loading method for an aircraft bulk cargo arresting net, characterized in that The invention comprises the following contents: 1) designing a bulk cargo loading dummy, which is a rigid structure. The shape of the rigid structure meets the requirements of the aircraft cargo hold, is bilaterally symmetrical with the aircraft symmetry plane as the symmetry plane, the lower surface of the rigid structure is a plane, which can be placed on the floor of the aircraft, and the side surface of one end of the rigid structure is the loading surface of the static test; 2) designing an aircraft loading cargo hold, one end of which is fixed on a test frame on one side, and a bulk cargo arresting net is provided at the other end of the aircraft loading cargo hold; 3) placing the bulk cargo loading dummy in the aircraft loading cargo hold, so that the loading surface of the cargo loading dummy is attached to the bulk cargo arresting net, the loading surface is connected to the front end of the loading actuator, and the rear end of the loading actuator is fixed on the test frame on the other side; 4) applying tension to the bulk cargo loading dummy through the loading actuator, and the bulk cargo loading dummy is reversely arrested by the bulk cargo arresting net, so as to achieve the purpose of the static test of the aircraft bulk cargo arresting net.
2. The static test loading method for an aircraft bulk cargo arresting net according to claim 1, characterized in that: The bulk cargo loading dummy is composed of six independent loading units; the six loading units are arranged symmetrically with the aircraft symmetry plane as the symmetry plane, and are divided into three layers from top to bottom. Each loading unit is welded by a steel truss structure and a front end steel plate to form a rigid structure. The front end face of each loading unit is the loading surface, and a loading through hole is designed at the centroid of the steel plate of the loading surface to fix the test loading fixture.
3. The static test loading method for an aircraft bulk cargo arresting net according to claim 2, characterized in that: Three parallel test loading fixtures are fixed on the loading surface of the bulk cargo loading dummy. The three parallel test loading fixtures are respectively fixed on the loading through holes of the two loading units of the upper layer, the middle layer and the lower layer. A loading joint is provided at the center of each test loading fixture, and each loading joint is connected to the telescopic end of a loading actuator.
4. The static test loading method for an aircraft bulk cargo arresting net according to claim 2, characterized in that: The loading surface of the bulk cargo loading dummy is a plane, and its edge is an arc chamfer.
5. An aircraft bulk cargo loading dummy, characterized in that: The bulk cargo loading dummy is a rigid structure whose shape meets the requirements of an aircraft cargo hold and is bilaterally symmetrical with the aircraft symmetry plane as the symmetry plane. The lower surface of the rigid structure is a plane and can be placed on the floor of the aircraft. The side surface at one end of the rigid structure is the loading surface for the static test.
6. The aircraft bulk cargo loading dummy according to claim 5, characterized in that: The bulk cargo loading dummy is composed of six independent loading units; the six loading units are arranged symmetrically with the aircraft symmetry plane as the symmetry plane, and are divided into three layers from top to bottom. Each loading unit is welded by a steel truss structure and a front end steel plate to form a rigid structure. The front end face of each loading unit is the loading surface, and a loading through hole is designed at the centroid of the steel plate of the loading surface to fix the test loading fixture.