A helicopter cable cutter bumping test device and method

Abstract

The application provides a helicopter cable cutter cable collision test device and method, 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 counterweight 9, a piston rod 10, a cable 11, an energy absorption device 12, a load sensor 13, a high-speed camera 14. The application is specially used for helicopter cable cutter cable collision test; different cable collision speeds, cutter blade and cutter rack mass test states can be realized; various cable and cable and test piece angle test states can be realized; the stress deformation state of the test piece and the cable during the cable collision can be clearly captured.

Description

Technical Field

[0001] This application belongs to the field of helicopter cable impact testing technology, specifically relating to a helicopter cable cutter cable impact testing device and method. Background Technology

[0002] Because of their low flight altitude, helicopters may encounter obstacles such as high-altitude power cables during flight. Therefore, helicopters are equipped with cable cutters on their exteriors. When they encounter cables or similar obstacles, they can cut them instantly to prevent the crash and loss of life.

[0003] To understand the mechanical properties of a cable cutter, including the instantaneous acceleration, stress, and strain generated when cutting cables in helicopter flight, it is necessary to conduct cable impact tests in the laboratory. The key focus of this study is on the changes in load on the cutter in three directions and the cable tension under various initial impact velocities v and cable suspension angles θ.

[0004] Currently, there is no research on relevant experimental technologies in the field of helicopters. Summary of the Invention

[0005] The purpose of this invention is to provide a design and method for a helicopter cutter cable impact test device, which can realize test states such as different cable impact speeds and cable impact angles of the cutter while ensuring the cutter's attitude.

[0006] In a first aspect, this application provides a test device for a helicopter cable cutter impact test, the device comprising a test bench 1, a guide rail 2, an electric winch 3, a bomb hook 4, a pulley 5, a cutter 6, a 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.

[0007] Preferably,

[0008] High-speed camera 14, located at the front and side;

[0009] The load sensor 13 is connected to both ends of the cable and then fixed to the platform via a connector.

[0010] Energy absorption device 12 is located in the center of the water tank.

[0011] Preferably,

[0012] Cable 11, with both ends fixed to the platform, the fixed point can be moved up and down, and the front and back positions are aligned with the cutting edge of the cutter;

[0013] The piston rod 10 is connected to the basket 7 at one end and is coaxial with the energy absorption device 12. Its outer surface is adapted to the energy absorption device 12.

[0014] Preferably,

[0015] Counterweight 9 is located inside the suspended platform 7 and is fixed by a counterweight rod in the suspended platform;

[0016] The force measuring device 8 consists of 8 identical single-dimensional force measuring arms. Each force measuring arm consists 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 suspended basket 7, and the other end is fixedly connected to the cutter 6.

[0017] Preferably,

[0018] The load sensor in the eight force-measuring arms of the force-measuring device is hinged at both ends and subjected only to axial force, which reduces coupling error and ensures measurement accuracy.

[0019] Preferably,

[0020] The suspended platform 7 is hinged to the platform via 16 pulleys 5 and slides up and down.

[0021] Cutter 6, test piece;

[0022] The pulley 5 is fixed to the suspended platform 7 by a connector.

[0023] Preferably,

[0024] The bomb hook 4 is attached to the electric winch 3 and can release the hook instantly;

[0025] Electric winch 3, fixed to the top of the platform;

[0026] Guide rail 2: Four guide rails stand inside the platform, arranged in a square and evenly distributed manner, and are in a fully constrained state.

[0027] The test bench body 1 has a symmetrical structure, with its lower end fixed to the ground, and can withstand large loads.

[0028] Secondly, this application also provides a method for testing the cable impact of a helicopter cable cutter, the method comprising:

[0029] Step 1: Select a suitable location to place the water tank, build an energy absorption device 12 inside the water tank, build a device frame 1 around the water tank, and install guide rails 2, electric winch 3, and bomb hook 4.

[0030] Step 2: Assemble the suspended basket 7, slide the suspended basket 7 into the guide rail 2, connect the hook on the suspended basket 7 to the bomb hook 4, adjust the pulley 5 to fit the guide rail, and ensure that the suspended basket 7 can slide freely up and down without jamming.

[0031] Step 3: Fill the energy absorption device 12 with water, then install the cutter 6 on the force measuring device 8, 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 at both ends of the cable according to the cable suspension angle θ requirement, and connect the cable so that the angle between it and the cutter 6 meets the requirements.

[0033] Step 5: According to the test requirements, select an appropriate weight counterweight 9 and install it in the basket 7. Calculate the basket height based on the initial cable impact speed and raise the basket 7 to the appropriate height H.

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

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

[0036] This application has the following technical effects:

[0037] 1. To achieve different test conditions for cable impact speed v, cutter blade and cutter stand mass, the cable impact speed v is obtained by adjusting H, the formula is: H=v2 / 2g, and the cutter stand mass is obtained by adjusting the counterweight 9.

[0038] 2. To achieve test conditions for various cables and their suspension angles, the cable suspension angle θ is obtained by adjusting h;

[0039] 3. Clearly captures the stress and deformation of the test piece and cable during cable impact, with high test accuracy. The high-speed camera 14 clearly captures the deformation of the test piece and cable during cable impact. Load sensors 13 are connected in series between the cable ends and the connection point of the wire support. 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 obtained by measuring and decoupling the force measuring device 8. Attached Figure Description

[0040] Figure 1 A schematic diagram of the overall structure of a helicopter cable cutter cable impact test device;

[0041] Figure 2 This is a connection diagram for the cutter, suspended platform, and force measuring device. Detailed Implementation

[0042] This invention is specifically designed for cable impact testing of helicopter cable cutters. Its functions are as follows: 1. It can achieve test conditions with different cable impact speeds, cutter blades, and cutter stand mass; 2. It can achieve test conditions for various cables and various angles between the cable and the test piece; 3. It can clearly capture the stress and deformation of the test piece and cable during cable impact.

[0043] Please see Figure 1 and Figure 2A helicopter cable cutter impact test device consists of a test bench 1, a guide rail 2, an electric winch 3, a bomb hook 4, a pulley 5, a cutter 6, a 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.

[0044] Its features include:

[0045] High-speed camera 14, located at the front and side;

[0046] The load sensor 13 is connected to both ends of the cable and then fixed to the platform via a connector.

[0047] Energy absorption device 12 is located at the center of the water tank;

[0048] Cable 11, with both ends fixed to the platform, the fixed points can be moved up and down, and the front and back positions are aligned with the cutting edge of the cutter;

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

[0050] Counterweight 9 is located inside the suspended platform 7 and is fixed by a counterweight rod in the suspended platform;

[0051] The force measuring device 8 consists of eight identical single-dimensional force measuring arms. Each force measuring arm comprises a load sensor, upper and lower single forks, and upper and lower double forks. The load sensor in each of the eight force measuring arms is hinged at both ends, subjected only to axial force, reducing coupling errors and ensuring measurement accuracy. One end of the force measuring device is fixedly connected to the side of the suspended basket 7, and the other end is fixedly connected to the cutter 6.

[0052] The suspended platform 7 is hinged to the platform via 16 pulleys 5 and can slide up and down.

[0053] Cutter 6, test piece;

[0054] Pulley 5 is fixed to the suspended platform 7 via a connector;

[0055] The bomb hook 4 is attached to the electric winch 3 and can release the hook instantly;

[0056] Electric winch 3, fixed to the top of the platform;

[0057] Guide rail 2: Four guide rails stand inside the platform, arranged in a square and evenly distributed manner, and are in a fully constrained state.

[0058] The test bench body 1 has a symmetrical structure, with its lower end fixed to the ground, and can withstand large loads.

[0059] This invention pertains to helicopter cable impact testing technology. 1. It enables testing of different cable impact speeds (v), cutter blades, and cutter stand masses. The impact speed (v) is obtained by adjusting H, using the formula: H = v² / 2g. The cutter stand mass is obtained by adjusting the counterweight 9. 2. It enables testing of various cables and their suspension angles. The cable suspension angle (θ) is obtained by adjusting h. 3. It clearly captures the stress and deformation of the test piece and cable during impact, achieving high testing accuracy. A high-speed camera 14 clearly captures the deformation of the test piece and cable during impact. Load sensors 13 are connected in series between the cable ends and the connection points to the cable support. By measuring these sensors, the tension change curves at both ends of the cable are obtained. The x, y, and z load change curves of the cutter are obtained through measurement and decoupling using a force measuring device 8. Detailed implementation method:

[0061] By calculating and adjusting the height H to meet the initial cable impact speed of the cutter required by the test, adjusting the height h to meet the cable suspension angle θ required by the test, and adding a counterweight 9 to meet the mass of the cutter stand required by the test;

[0062] Choose a suitable location to place the water tank, build an energy absorption 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 suspended basket 7, slide the suspended basket 7 into the guide rail 2, and connect the hook on the suspended basket 7 to the bomb hook 4. Adjust the pulley 5 to make it fit the guide rail, ensuring that the suspended basket 7 can slide freely up and down without jamming.

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

[0065] Based on the cable suspension angle θ requirement, calculate and select the fixed positions at both ends of the cable, connect the cable, and make the angle between it and the cutter 6 meet the requirements.

[0066] According to the test requirements, a suitable weight counterweight 9 was selected and installed inside the basket 7. The basket height was calculated based on the initial cable impact speed, and the basket 7 was raised to a suitable height H.

[0067] Place the high-speed camera in the appropriate position and test and debug the camera equipment.

[0068] Once everything was ready, the test began. The data acquisition equipment and high-speed camera started recording. Following the operator's instructions, the bomb hook 4 release button was activated to complete the test.

Claims

1. A cable impact testing device for a helicopter cable cutter, characterized in that, The device consists of a test bench (1), a guide rail (2), an electric winch (3), a bomb hook (4), a pulley (5), a cutter (6), a 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); Among them, the high-speed camera (14) is located at the front and the side; The load sensor (13) is connected to both ends of the cable and then fixed to the platform via a connector; The energy absorption device (12) is located in the center of the water tank; The cable (11) is fixed at both ends on the platform. The position of the fixing point can be moved up and down, and the front and back positions are aligned with the cutting edge of the cutter. The piston rod (10) is connected to the basket (7) at one end and is coaxial with the energy absorption device (12), and its outer surface is adapted to the energy absorption device (12); The counterweight (9) is located inside the suspended platform (7) and is fixed by a counterweight rod in the suspended platform; The force measuring device (8) consists of 8 single-dimensional force measuring arms with the same structure. Each force measuring arm consists 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 basket (7), and the other end is fixedly connected to the cutter (6). The load sensor in the eight force-measuring arms of the force-measuring device is hinged at both ends and subjected only to axial force, which reduces coupling error and ensures measurement accuracy. The suspended basket (7) is hinged to the platform via 16 pulleys (5) and slides up and down; Cutter (6), test piece; The pulley (5) is fixed to the basket (7) by a connector; The bomb hook (4) is attached to the electric winch (3) and can be released instantly; Electric winch (3) is fixed to the top of the platform; Guide rail (2): Four guide rails stand in the platform body, arranged in a square and uniformly, and are in a fully constrained state; The test bench (1) has a symmetrical structure and its lower end is fixed to the ground, which can withstand large loads.

2. A method for testing cable impact with a helicopter cable cutter, characterized in that, The method includes: Step 1: Select a suitable location to place the water tank, build an energy absorption device (12) inside the water tank, build a device frame (1) around the water tank, and install the guide rail (2), electric winch (3), and bomb hook (4). Step 2: Assemble the basket (7), slide the basket (7) into the guide rail (2), connect the hook on the basket (7) to the bomb hook (4), adjust the pulley (5) to fit with the guide rail, and ensure that the basket (7) can slide freely up and down without jamming. Step 3: Fill the energy absorption device (12) with water, then install the cutter (6) on the force measuring device (8), then connect the force measuring device (8) to the 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 at both ends of the cable according to the cable suspension angle θ requirement, and connect the cable so that the angle between it and the cutter (6) meets the requirements; Step 5: According to the requirements of the test task, select an appropriate weight counterweight (9) and install it in the basket (7). Calculate the height of the basket based on the initial cable impact speed and raise the basket (7) to the appropriate height H. Step 6: Place the high-speed camera in the appropriate position and test and debug the 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 instructions and turn on the bomb hook (4) release button to complete the test.

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