A low-cost test method suitable for high-speed separation of large internal loads

Abstract

A low-cost test method suitable for high-speed separation of a built-in large load belongs to the field of mechanical technology. Based on the traditional hanging separation test, the present invention adopts a pulley block + weight method to simulate the separation force loading, thereby realizing a ground test of high-speed separation of a built-in large load. The entire test system consists of a test piece, a suspension device, a loading device, a ground measurement and control and recovery device, wherein the test piece consists of a test cabin, a built-in large load, a measuring device on the aircraft, and a connection and unlocking device; the suspension device consists of a hanger and a sling; the loading device consists of a pulley block and a loaded weight; the ground device consists of a ground measuring device, a weight release control device and a ground recovery device. The present invention solves the shortcomings of the existing built-in large load high-speed separation test, such as high cost, complex test and high dependence on test conditions, and can realize the ground test verification of the built-in large load high-speed separation test at a relatively low cost and test conditions.

Description

Technical Field

[0001] The invention relates to a low-cost test method suitable for high-speed separation of a built-in large load, and belongs to the technical field of aircraft separation systems. Background Art

[0002] Traditional aircraft separation tests generally need to simulate the relative motion between the separation bodies during the separation process, including the degrees of freedom of the separation bodies of interest, the relative speed between the separation bodies, and the final separation distance. For high-speed separation tests with large internal loads, in order to achieve the above simulation goals, traditional separation test methods generally require the use of short-term, high-thrust separation rockets, separation thrusters, etc. to provide separation force. However, this simulation method, on the one hand, requires that the separation rockets and separation thrusters are pyrotechnics, and the separation pyrotechnics themselves are expensive; on the other hand, the use of pyrotechnics in the test places high demands on the storage, assembly, and safety of the test site of the test pieces. Summary of the Invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the existing technology and provide a low-cost test method suitable for high-speed separation of large internal loads, which solves the shortcomings of the existing high-speed separation test of large internal loads, high cost, complex test and high dependence on test conditions, and can realize ground test verification of the high-speed separation test of large internal loads at relatively low cost and test conditions.

[0004] The technical solution of the present invention is: a low-cost test system suitable for high-speed separation of a large internal load, comprising a hanger, a sling, a test piece, a pulley block, a load weight, a ground measuring device, a control device and a ground recovery device;

[0005] The hanger is used to hang the test piece, the pulley block and the loaded weight to a given height;

[0006] The sling is installed on the hanger and is used to connect the hanger and the test piece;

[0007] The test piece is vertically suspended on a hanger by a sling to simulate the internal load and mass characteristics of the test cabin, simulate the actual contact structure and connection and unlocking device of the separated two bodies, and provide space and structural interfaces for the installation and fixation of measurement equipment on the aircraft;

[0008] The pulley assembly is installed on the hanger and the ground tooling, and is used to adjust the direction and magnitude of the force exerted by the loaded weight on the internal load, while ensuring that the acceleration of the loaded weight falling is converted into the separation acceleration required by the internal load;

[0009] The loaded weight is hung on the lower end of the pulley block through the steel wire rope of the pulley block to provide a separation force;

[0010] The ground measurement equipment is arranged in a safe area on one side of the test piece and is used to measure the separation process on the ground, receive, collect and store the measurement signals;

[0011] The control device is arranged in a safe area on one side of the test piece, similar to the ground measurement device, and is used to control the connection unlocking device to release the connection between the internal load and the test chamber;

[0012] The ground recovery device is arranged below the test piece and is a built-in load recovery device.

[0013] Furthermore, a fixed pulley in a pulley block is used to change the loading direction.

[0014] Furthermore, the fixed pulley is installed on the hanger and the ground.

[0015] Furthermore, the load is hung on the movable pulley in the pulley system and the movable pulleys at all levels are used to increase the speed and reduce the force, so that the test piece falls at an acceleration of 2 n times the acceleration of the loaded weight falling; n is the number of movable pulleys in the pulley set.

[0016] Furthermore, the movable pulley is used to reduce the loading force acting on the test piece but increase the loading speed.

[0017] Furthermore, the test piece is hung vertically and the separation direction is downward, and the acceleration due to gravity is utilized to reduce the requirement on the force applied to the test piece.

[0018] Furthermore, the hanger is constructed in the form of a gantry indoors or outdoors.

[0019] The test method implemented according to the low-cost test system suitable for high-speed separation of large loads includes:

[0020] Assemble the test piece and connect it to the hanger arm through the sling after final assembly;

[0021] Install the pulley assembly and connect the corresponding steel cable to the internal load through the force sensor;

[0022] Install the ground measurement equipment, connect the measurement equipment on the aircraft to the ground measurement equipment, and connect the unlocking device cable to the control device;

[0023] The measurement system self-checks to ensure that each measuring device operates normally and each sensor can obtain test data normally;

[0024] Lift the loaded object, connect it to the pulley block, and lower it slowly;

[0025] The control device issues a command to unlock the test piece, and the ground and missile-mounted measurement devices begin collecting data;

[0026] The internal load falls into the recovery device under the action of the heavy object loading, and the heavy object falls to the ground and stops moving; after t seconds, the measurement system stops collecting data; the test ends.

[0027] The advantages of the present invention compared with the prior art are:

[0028] Compared with the existing technology, the present invention has the following advantages: a pulley set + weight method is used to simulate separation force loading, thereby realizing a ground test of high-speed separation with a large internal load (relative separation acceleration exceeds 1g), which solves the shortcomings of the existing high-speed separation test with a large internal load, high cost, complex test, and high requirements on test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the test system principle of the present invention. DETAILED DESCRIPTION

[0030] In order to better understand the above technical solution, the technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0031] The following is a further detailed description of a low-cost test method for high-speed separation of a large internal load provided by the embodiment of the present application in conjunction with the accompanying drawings. The specific implementation method may include (eg Figure 1 shown):

[0032] On the basis of the traditional hanging separation test, the pulley block + weight method is used to simulate the separation force loading, so as to realize the high-speed separation ground test with a large internal load. The entire test system consists of a test piece, a suspension device, a loading device, a ground measurement and control device, and a recovery device. The test piece consists of a test cabin, a large internal load, a measuring device on the aircraft, and a connection and unlocking device; the suspension device consists of a hanger and a sling; the loading device consists of a pulley block and a loading weight; the ground device consists of a ground measurement device, a weight release control device, and a ground recovery device. The test system is as follows: Figure 1 shown.

[0033] The test principle of the present invention is as follows: by suspending the test piece to a given height, the pitch and yaw degrees of freedom of the aircraft during flight are simulated; by reasonably setting the mass of the pulley set and the weight, the separation force is simulated; and the separation force and posture changes during the separation process are measured by force sensors and high-speed photography.

[0034] Before the test, determine the test piece's suspension height (the height of the test piece's lower end from the ground), the weight of the loaded object, and the suspension height (the height of the weight's lower bottom from the ground) as follows:

[0035] a) Determine the separation distance (h1) required to be achieved for the internal load during the test based on the separation distance in the separation plan;

[0036] b) Determine the separation velocity (v1) when the internal load reaches the separation distance in the test according to the separation plan, and use this as the velocity at which the internal load falls into the recovery device;

[0037] c) Based on the velocity v1 at which the internal load falls into the recovery device and the recovery device's own cushioning performance, calculate the required thickness h2 of the recovery device according to the following relationship: where mf is the mass of the internal load, x is the depth to which the test piece sinks into the recovery device, K and C are the elastic coefficient and damping coefficient of the recovery device, respectively (provided by the manufacturer), and tr is the moment when the test piece first decelerates to zero.

[0038]

[0039]

[0040] h2=1.5x(t r )

[0041] d) The test piece suspension height h is the sum of the test piece drop height h1 and the recovery device thickness h2.

[0042] e) The separation force in the separation scheme determines the relative acceleration a of the internal load to the test chamber that needs to be simulated in the test.

[0043] f) Determine the number of movable pulleys n in the pulley system as the integer part of ||a / g|| based on the ratio of the relative acceleration a to the acceleration due to gravity, where g is the acceleration due to gravity.

[0044] g) Then determine the mass M of the loaded weight according to the following formula.

[0045]

[0046] h) Finally, determine the minimum height h3 = h1 / 2 required to load the weight according to the following formula: n .

[0047] During the test, the test piece is fixed to the hanger using a sling, and then suspended to a given height by the hanger. To ensure that the test piece is suspended vertically and still before the test begins, a fixed rope should be used to secure the test piece to prevent interference factors such as wind from causing the test piece to sway left and right before release.

[0048] During the test, the ground control system sends an unlock command to the connection unlocking device, which releases the connection between the internal load and the test chamber. After the internal load is released from the test chamber, the test piece is separated from the chamber under the action of the separation force provided by the load weight and the pulley block.

[0049] The internal load and heavy objects fall into the ground recovery device for recycling and reuse.

[0050] During the test, the separation force change is obtained by using a force sensor pre-installed between the internal load and the loading device, and the movement of the two bodies during the separation process is obtained by using high-speed cameras arranged around the test site.

[0051] In the solution provided in the embodiment of the present application, Figure 1 As shown, the separation test system of the present invention is composed of a hanger 1, a sling 2, a test piece 3, a pulley block 4, a load weight 5, a ground measuring device 6, a control device 7 and a ground recovery device 8.

[0052] The hanger 1 is provided by the test implementer. A crane or an existing hanger can be selected based on the existing conditions of the test implementer, but it must meet the lifting height and lifting quality requirements. Its function is to suspend the test piece statically at a certain height, providing conditions for the load inside the test piece to fall and achieve separation movement.

[0053] The hanger 2 is used to connect the test piece to the hanger before the test and keep the test piece in a vertical state (separation direction downward).

[0054] Test article 3 consists of a test chamber, a large internal load, onboard measurement equipment, and a connection and unlocking device. It primarily simulates the internal load and mass characteristics of the test chamber, simulates the actual contact structure and connection and unlocking device of the separated two bodies, and provides space and structural interfaces for the installation and fixation of the onboard measurement equipment.

[0055] The pulley block 4 is mainly used to adjust the force exerted by the loaded weight on the internal load, and at the same time ensure that the acceleration of the loaded weight falling is converted into the separation acceleration required by the internal load;

[0056] The load weight 5 is used to provide the separation force.

[0057] The ground measurement equipment 6 is mainly used for measuring the separation process, receiving, compiling and storing the measurement signals on the ground;

[0058] The control device 7 is mainly used to control the connection unlocking device to release the connection between the internal load and the test chamber;

[0059] The recovery device 8 is mainly a built-in load recovery device.

[0060] Table 1 Test process

[0061]

[0062] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0063] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A low-cost test system suitable for high-speed separation of large internal loads, characterized by: Includes hanger, sling, test piece, pulley block, load weight, ground measuring equipment, control device and ground recovery device; The hanger is used to hang the test piece, the pulley block and the loaded weight to a given height; The sling is installed on the hanger and is used to connect the hanger and the test piece; The test piece is vertically suspended on a hanger by a sling to simulate the internal load and mass characteristics of the test cabin, simulate the actual contact structure and connection and unlocking device of the separated two bodies, and provide space and structural interfaces for the installation and fixation of measurement equipment on the aircraft; The pulley assembly is installed on the hanger and the ground tooling, and is used to adjust the direction and magnitude of the force exerted by the loaded weight on the internal load, while ensuring that the acceleration of the loaded weight falling is converted into the separation acceleration required by the internal load; The loaded weight is hung on the lower end of the pulley block through the steel wire rope of the pulley block to provide a separation force; The ground measurement equipment is arranged in a safe area on one side of the test piece and is used to measure the separation process on the ground, receive, collect and store the measurement signals; The control device is arranged in a safe area on one side of the test piece, similar to the ground measurement device, and is used to control the connection unlocking device to release the connection between the internal load and the test chamber; The ground recovery device is arranged below the test piece and is a built-in load recovery device; The load is hung on the movable pulley in the pulley system and the movable pulleys at all levels are used to increase the speed and reduce the force, so that the test piece falls at an acceleration of 2 n times the acceleration of the loaded weight falling; n is the number of movable pulleys in the pulley set.

2. A low-cost test system suitable for high-speed separation of large internal loads according to claim 1, characterized in that: The fixed pulley in the pulley block is used to change the loading direction.

3. A low-cost test system suitable for high-speed separation of large internal loads according to claim 2, characterized in that: The fixed pulley is installed on the hanger and the ground.

4. A low-cost test system suitable for high-speed separation of large internal loads according to claim 3, characterized in that The movable pulley is used to reduce the loading force acting on the test piece but increase the loading speed.

5. A low-cost test system suitable for high-speed separation of built-in large loads according to claim 1, characterized in that: The test piece is hung vertically and separated downward, and the acceleration due to gravity is used to reduce the force requirements on the test piece.

6. A low-cost test system suitable for high-speed separation of built-in large loads according to claim 1, characterized in that: The hanger is constructed in the form of a gantry frame indoors or outdoors.

7. The test method according to claim 1, wherein the low-cost test system suitable for high-speed separation with large load is implemented, include: Assemble the test piece and connect it to the hanger arm through the sling after final assembly; Install the pulley assembly and connect the corresponding steel cable to the internal load through the force sensor; Install the ground measurement equipment, connect the measurement equipment on the aircraft to the ground measurement equipment, and connect the unlocking device cable to the control device; The measurement system self-checks to ensure that each measuring device operates normally and each sensor can obtain test data normally; Lift the loaded object, connect it to the pulley block, and lower it slowly; The control device issues a command to unlock the test piece, and the ground and missile-mounted measurement devices begin collecting data; The internal load falls into the recovery device under the action of the heavy object loading, and the heavy object falls to the ground and stops moving; after t seconds, the measurement system stops collecting data; the test ends.

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