Helicopter cable cutter cable collision test device and method

Abstract

The invention provides a cable collision test device and method for a helicopter cable cutter. The device is composed of a test bed body 1, a guide rail 2, an electric winch 3, a bomb hook 4, a pulley 5, a cutter 6, a hanging basket 7, a force measuring device 8, a balance weight 9, a piston rod 10, a cable 11, an energy absorption device 12, a load sensor 13 and a high-speed camera 14. The device is specially used for the cable collision test of the helicopter cable cutter; according to the invention, test states of different cable collision speeds, cutter blade quality and cutter rack quality can be realized; test states of various cables and various angles between the cables and the test piece can be realized; and the stress deformation condition of the test piece and the cable during cable collision can be clearly captured.

Description

Technical Field

[0001] The present application belongs to the technical field of helicopter cable collision test, and in particular relates to a helicopter cable cutter cable collision test device and method. Background Art

[0002] Due to the low flying altitude, the helicopter may encounter interceptions such as high-altitude cables during flight. Therefore, the helicopter has a cable cutter installed outside the fuselage. When encountering cables, etc., it can instantly cut off the interceptions and avoid aircraft destruction and casualties.

[0003] In order to understand the acceleration, stress and strain and other mechanical properties of the cable cutter when the helicopter cuts the cable, it is necessary to complete the cutter cable collision test in the laboratory. In the process of studying the cutter cable collision, the focus is on the three-directional load of the cutter and the tension change of the cable under various initial cable collision speeds v and cable hanging angles θ.

[0004] At present, there is no relevant experimental technology research in the helicopter field. Summary of the invention

[0005] The purpose of the present invention is to provide a design and method for a helicopter cutter cable striking test device, which can realize the test state of the cutter with different cable striking speeds and cable striking angles while ensuring the cutter posture.

[0006] In the first aspect, the present application provides a helicopter cable cutter cable collision test device, which consists of a test bench body 1, a guide rail 2, an electric winch 3, a bomb hook 4, a pulley 5, a cutter 6, a hanging basket 7, a force measuring device 8, a counterweight 9, a piston rod 10, a cable 11, an energy absorption device 12, a load sensor 13, and a high-speed camera 14.

[0007] Preferably,

[0008] High-speed cameras 14, located in front and on the sides;

[0009] The load sensor 13 is connected to the two ends of the cable and fixed on the platform through a joint;

[0010] The energy absorbing device 12 is located at the center of the water tank.

[0011] Preferably,

[0012] Cable 11, both ends of which are fixed on the platform, the position of the fixed point moves up and down, and the front and rear positions are aligned with the cutting edge of the cutter;

[0013] One end of the piston rod 10 is connected to the hanging basket 7 and is coaxial with the energy absorbing device 12 , and the outer surface is adapted to the energy absorbing device 12 .

[0014] Preferably,

[0015] The counterweight 9 is located in the hanging basket 7 and is fixed by the counterweight rod in the hanging basket;

[0016] The force measuring device 8 is composed of 8 single-dimensional force measuring arms with the same structure, each of which is composed of a load sensor, upper and lower single forks and upper and lower double forks; one end of the force measuring device is fixedly connected to the side of the hanging basket 7, and the other end is fixedly connected to the cutter 6.

[0017] Preferably,

[0018] The load sensors in the 8 force measuring arms of the force measuring device are hinged at both ends and are only subjected to axial force, which reduces coupling errors and ensures measurement accuracy.

[0019] Preferably,

[0020] The hanging basket 7 is hinged to the platform through 16 pulleys 5 and slides up and down;

[0021] Cutter 6, test piece;

[0022] The pulley 5 is fixed on the hanging basket 7 through a connecting piece.

[0023] Preferably,

[0024] The bomb hook 4, which is hung on the electric winch 3, can release the grapple instantly;

[0025] An electric winch 3 is fixed to the top of the platform;

[0026] Guide rail 2, four guide rails stand in the platform body, are evenly arranged in a square shape, and are in a fully constrained state;

[0027] The test bench body 1 has a symmetrical structure, with the lower end fixed on the ground and capable of bearing a large load.

[0028] In a second aspect, the present application also provides a helicopter cable cutter collision test method, the method comprising:

[0029] Step 1, select a suitable location to place the water tank, build an energy absorption device 12 in the water tank, build a device frame 1 around the water tank, install a guide rail 2, an electric winch 3, and a bomb hook 4;

[0030] Step 2, assemble the hanging basket 7, slide the hanging basket 7 into the guide rail 2, and connect the hook on the hanging basket 7 with the bomb hook 4, adjust the pulley 5 to make it fit with the guide rail, and ensure that the hanging basket 7 can slide freely up and down without getting stuck;

[0031] Step 3, fill the energy absorbing device 12 with water, then install the cutter 6 on the force measuring device 8, then connect the force measuring device 8 to the hanging basket 7, and at the same time install the measuring sensor in place and connect the wires;

[0032] Step 4: Calculate and select the fixed positions of both ends of the cable according to the cable hanging angle θ requirement, and connect the cable so that the angle with the cutter 6 meets the requirement;

[0033] Step 5: According to the test task requirements, select a suitable weight 9 to be installed in the hanging basket 7, calculate the height of the hanging basket according to the initial cable collision speed, and lift the hanging basket 7 to a suitable height H;

[0034] Step 6: Place the high-speed camera in the appropriate position and debug the test and camera equipment;

[0035] Step 7: After everything is ready, start the test. The data acquisition equipment and high-speed camera start recording. Follow the operator's command and turn on the bomb hook 4 release button to complete the test.

[0036] This application has the following technical effects:

[0037] 1. Realize the test states of different cable collision speeds v, cutter blades and cutter stand masses. The cable collision speed v is obtained by adjusting H, and the formula is: H = v2 / 2g. The mass of the cutter stand is obtained by adjusting the counterweight 9 to obtain the corresponding mass;

[0038] 2. Realize the test status of various cables and various cable hanging angles. The cable hanging angle θ is obtained by adjusting h;

[0039] 3. Clearly capture the stress and deformation conditions of the test piece and the cable when hitting the cable, with high test accuracy. The deformation of the test piece and the cable when hitting the cable is clearly captured by high-speed camera 14. Load sensors 13 are connected in series between the two ends of the cable and the connection points of the wire bracket. By measuring them, the tension change curves at both ends of the cable are obtained. The x, y, and z load change curves of the cutter are measured by the force measuring device 8 and then decoupled. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of a helicopter cable cutter collision test device;

[0041] Figure 2 This is the connection diagram of the cutter, hanging basket and force measuring device. DETAILED DESCRIPTION

[0042] The present invention is specially used for the cable striking test of helicopter cable cutters. Its functions are as follows: 1. It can realize the test states of different striking speeds, cutter blades and cutter stand masses; 2. It can realize the test states of various cables and various angles between cables and test pieces; 3. It can clearly capture the stress and deformation conditions of the test piece and the cable when striking the cable.

[0043] See also Figure 1 and Figure 2A helicopter cable cutter cable collision test device consists of a test bench body 1, a guide rail 2, an electric winch 3, a bomb hook 4, a pulley 5, a cutter 6, a hanging basket 7, a force measuring device 8, a counterweight 9, a piston rod 10, a cable 11, an energy absorbing device 12, a load sensor 13, and a high-speed camera 14.

[0044] The invention is characterized by comprising:

[0045] High-speed cameras 14, located in front and on the sides;

[0046] The load sensor 13 is connected to the two ends of the cable and fixed on the platform through a joint;

[0047] The energy absorbing device 12 is located in the center of the water tank;

[0048] Cable 11, both ends of which are fixed on the platform, the position of the fixed point can be moved up and down, and the front and rear positions are aligned with the cutting edge of the cutter;

[0049] The piston rod 10 has one end connected to the hanging basket 7 and is coaxial with the energy absorbing device 12, and the outer surface is adapted to the energy absorbing device 12;

[0050] The counterweight 9 is located in the hanging basket 7 and is fixed by the counterweight rod in the hanging basket;

[0051] The force measuring device 8 is composed of 8 single-dimensional force measuring arms with the same structure. Each force measuring arm is composed of a load sensor, an upper and lower single fork, and an upper and lower double fork. The load sensors in the 8 force measuring arms of the force measuring device are hinged at both ends and are only subjected to axial force, which reduces coupling errors and ensures the accuracy of measurement. One end of the force measuring device is fixedly connected to the side of the hanging basket 7, and the other end is fixedly connected to the cutter 6;

[0052] The hanging basket 7 is hinged to the platform through 16 pulleys 5 and can slide up and down;

[0053] Cutter 6, test piece;

[0054] The pulley 5 is fixed on the hanging basket 7 through a connecting piece;

[0055] The bomb hook 4, which is hung on the electric winch 3, can release the grapple instantly;

[0056] An electric winch 3 is fixed to the top of the platform;

[0057] Guide rail 2, four guide rails stand in the platform body, are evenly arranged in a square shape, and are in a fully constrained state;

[0058] The test bench body 1 has a symmetrical structure, with the lower end fixed on the ground and capable of bearing a large load.

[0059] The present invention belongs to the test technology of helicopter cable collision. 1. It realizes the test states of different cable collision speeds v, cutter blades and cutter stand masses. The cable collision speed v is obtained by adjusting H, and the formula is: H=v2 / 2g. The cutter stand mass is obtained by adjusting the counterweight 9 to obtain the corresponding mass; 2. It realizes the test states of various cables and various cable hanging angles. The cable hanging angle θ is obtained by adjusting h; 3. It clearly captures the stress and deformation conditions of the test piece and the cable when the cable is hit, and has high test accuracy. The deformation conditions of the test piece and the cable when the cable is hit are clearly captured by high-speed camera 14. Load sensors 13 are connected in series between the two ends of the cable and the connection points of the wire bracket. By measuring them, the tension change curves of the two ends of the cable are obtained. The x, y, and z load change curves of the cutter are measured by the force measuring device 8 and then decoupled. Specific implementation method:

[0061] Through calculation, the height H is adjusted to meet the initial cable collision speed of the cutter required by the test, the height h is adjusted to meet the cable suspension angle θ required by the test, and the counterweight 9 is added to meet the cutter stand quality required by the test;

[0062] Select a suitable location to place the water tank, build an energy absorbing device 12 inside the water tank, build a device frame 1 around the water tank, and install a guide rail 2, an electric winch 3, and a bomb hook 4;

[0063] Assemble the hanging basket 7, slide the hanging basket 7 into the guide rail 2, connect the hook on the hanging basket 7 with the bomb hook 4, adjust the pulley 5 to make it fit with the guide rail, and ensure that the hanging basket 7 can slide freely up and down without getting stuck.

[0064] Fill the energy absorbing device 12 with water, then install the cutter 6 on the force measuring device 8, and then connect the force measuring device 8 to the hanging basket 7. At the same time, install the measuring sensor in place and connect the wires.

[0065] According to the cable hanging angle θ requirement, the fixed positions of both ends of the cable are calculated and selected, and the cable is connected so that the angle with the cutter 6 reaches the requirement.

[0066] According to the test task requirements, a suitable weight counterweight 9 is selected and installed in the hanging basket 7, and the height of the hanging basket is calculated according to the initial cable collision speed, and the hanging basket 7 is lifted to a suitable height H.

[0067] Place the high-speed camera at the appropriate location, debug the test and camera equipment.

[0068] After everything is ready, the test begins. The data acquisition equipment and high-speed camera start recording. Following the operator's command, the bomb hook 4 release button is turned on to complete the test.

Claims

1. A helicopter cable cutter collision test device, characterized in that: The device is composed of a test bench body (1), a guide rail (2), an electric winch (3), a bomb hook (4), a pulley (5), a cutter (6), a hanging basket (7), a force measuring device (8), a counterweight (9), a piston rod (10), a cable (11), an energy absorbing device (12), a load sensor (13), and a high-speed camera (14).

2. The device according to claim 1, characterized in that High-speed cameras (14), located in front and on the side; The load sensor (13) is connected to the two ends of the cable and then fixed on the platform through a joint; The energy absorbing device (12) is located at the center of the water tank.

3. The device according to claim 2, characterized in that The cable (11) has two ends fixed on the platform, and the position of the fixed point moves up and down, and the front and rear positions are aligned with the cutting edge of the cutter; One end of the piston rod (10) is connected to the hanging basket (7) and is coaxial with the energy absorbing device (12), and the outer surface of the piston rod (10) is adapted to the energy absorbing device (12).

4. The device according to claim 3, characterized in that A counterweight (9) is located in the hanging basket (7) and is fixed by a counterweight rod in the hanging basket; The force measuring device (8) is composed of 8 single-dimensional force measuring arms with the same structure, each force measuring arm is composed of a load sensor, an upper and lower single fork and an upper and lower double fork; one end of the force measuring device is fixedly connected to the side of the hanging basket (7), and the other end is fixedly connected to the cutter (6).

5. The device according to claim 4, characterized in that The load sensors in the 8 force measuring arms of the force measuring device are hinged at both ends and are only subjected to axial force, which reduces coupling errors and ensures measurement accuracy.

6. The device according to claim 5, characterized in that The hanging basket (7) is hinged to the platform through 16 pulleys (5) and slides up and down; Cutter (6), test piece; The pulley (5) is fixed on the hanging basket (7) through a connecting piece.

7. The device according to claim 6, characterized in that A bomb hook (4), which is attached to an electric winch (3) and can release the grapple instantly; An electric winch (3) is fixed to the top of the platform; Guide rails (2), four guide rails are erected in the platform body, evenly arranged in a square shape, and are in a fully constrained state; The test bench body (1) has a symmetrical structure, with the lower end fixed on the ground and capable of bearing a large load.

8. A helicopter cable cutter collision test method, characterized in that: The method comprises: Step 1: Select a suitable location to place the water tank, build an energy absorbing device (12) inside the water tank, build a device frame (1) around the water tank, and install a guide rail (2), an electric winch (3), and a bomb hook (4); Step 2, assemble the hanging basket (7), slide the hanging basket (7) into the guide rail (2), connect the hook on the hanging basket (7) with the bomb hook (4), adjust the pulley (5) to make it fit with the guide rail, and ensure that the hanging basket (7) can slide freely up and down without getting stuck; Step 3, fill the energy absorbing device (12) with water, then install the cutter (6) on the force measuring device (8), then connect the force measuring device (8) to the hanging basket (7), and at the same time install the measuring sensor in place and connect the wires; Step 4: Calculate and select the fixed positions of both ends of the cable according to the cable hanging angle θ requirement, and connect the cable so that the angle with the cutter (6) meets the requirement; Step 5: According to the test task requirements, select a suitable weight counterweight (9) to be installed in the hanging basket (7), calculate the height of the hanging basket according to the initial cable collision speed, and lift the hanging basket (7) to a suitable height H; Step 6: Place the high-speed camera in the appropriate position and debug the test and camera equipment; Step 7: After everything is ready, start the test. The data acquisition equipment and high-speed camera start recording. Follow the operator's command and open the bomb hook (4) release button to complete the test.

Images