Mobile parachute opening test device

Abstract

The present invention relates to a mobile parachute opening test device, comprising a data acquisition device, a data processing system, a power distribution system and an electrical control box, wherein the data acquisition device is connected with the data processing system; the data acquisition device comprises a GPS speed sensor, a parachute rope tension sensor, a camera, a pitot tube and a weather station, wherein the data acquisition device, the data processing system, the power distribution system and the electrical control box are assembled on a heavy-duty loader; the heavy-duty loader is also provided with a parachute dragging mechanism, and a parachute ejector is arranged beside the parachute dragging device; the parachute body is installed in the parachute ejector, and the parachute rope is connected with the parachute dragging mechanism. The present invention is tested under natural wind, can make a linear motion on a specific route, and simulates a dynamic pressure condition of parachute opening that is closer to the real one. The present invention has a simple structure, good stability, and a high degree of automation, and is suitable for industrial promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of parachute opening test, in particular to a mobile parachute opening test device. Background Art

[0002] The parachute is an important aerodynamic deceleration device. Since the parachute is a soft and breathable object, its working engineering involves different fields, including aerodynamics, structural mechanics and flight mechanics. It is very difficult to study such a complex aeroelastic body. For many years, the research on parachutes has always relied on a semi-theoretical and semi-empirical method, and experimental research is still the main research method for parachutes. Now it is necessary to develop a parachute drag test system to fully verify the designed parachute and examine the performance of the parachute.

[0003] At present, the main test methods include dropping tests from aircraft, launching booster vehicles from aircraft, launching test vehicles from high-altitude balloons, launching test vehicles from the ground, and launching ballistic vehicles. The other type is wind tunnel testing, which is characterized by the ability to control initial test conditions, accurately measure performance parameters, recover and reuse test vehicles, and conduct tests frequently. However, the above two test environmental conditions are constrained, which means that during the opening process of the test parachute, its speed attenuation is very small, and in some cases, it cannot fully simulate the real situation. Therefore, the experimental research of parachutes is of great significance to theoretical research and the successful development of new products. Summary of the invention

[0004] The invention aims to make a parachute test closer to a real use state and provides a mobile parachute opening test device.

[0005] The present invention solves the above-mentioned problem by adopting the following technical solution:

[0006] A mobile parachute opening test device comprises a data acquisition device, a data processing system, a power distribution system and an electrical control box, wherein the data acquisition device is connected with the data processing system; the data acquisition device comprises a GPS speed sensor, a parachute rope tension sensor, a camera, a pitot tube and a weather station, and the data acquisition device, the data processing system, the power distribution system and the electrical control box are assembled on a heavy-duty loader; the heavy-duty loader is also provided with a parachute dragging mechanism, and a parachute ejector is arranged next to the parachute dragging device; the parachute body is installed in the parachute ejector, and the parachute rope is connected with the parachute dragging mechanism.

[0007] Compared with the prior art, the present invention using the above technical solution has the following beneficial effects:

[0008] The present invention is tested under natural wind and can perform linear motion on a specific route to simulate dynamic pressure conditions that are closer to the actual parachute opening. The present invention has a simple structure, good stability, and a high degree of automation, and is suitable for industrial promotion.

[0009] As an embodiment of the parachute dragging device:

[0010] The parachute dragging mechanism includes a support arm fixed to the bottom plate of the heavy-duty loader, the upper end of the support arm is connected to the boom, and a variable-length oil cylinder for adjusting the angle between the boom and the support arm is provided. The bottom of the variable-length oil cylinder is fixed beside the support arm, and the hydraulic station of the variable-length oil cylinder is installed on the heavy-duty loader; a pitch frame is installed at the other end of the boom, and a double-ear plate is provided at the lower back of the pitch frame, and the double-ear plate is movably connected to the end of the boom through a rotating shaft; an angle adjustment oil cylinder is provided between the upper back of the pitch frame and the boom, and the piston end of the angle adjustment oil cylinder is pin-connected to the pitch frame, and the fixed end of the angle adjustment oil cylinder is pin-connected to the upper side of the boom; a parachute rope tension sensor is provided on the front of the pitch frame, and a locker for fixing the parachute rope is installed on the parachute rope tension sensor. The dragging mechanism is specially used for drag parachute testing, and the arm has a strong ability to adapt to the movement of the umbrella cover and can automatically imitate the real tension state.

[0011] As a preferred embodiment, a further technical solution of this embodiment is:

[0012] The supporting arm connection end of the movable arm is provided with a fixed axis hole, and a movable axis hole is provided in front of the fixed axis hole; the upper end of the supporting arm is provided with a first axis hole, and a second axis hole is provided below and behind the first axis hole; the first axis hole overlaps with the fixed axis hole and is installed with a first pin; the second axis hole is connected to the first connecting plate through the second pin; the movable axis hole is connected to the second connecting plate through the fourth pin; the free ends of the first connecting plate and the second connecting plate are connected to the piston end of the variable amplitude oil cylinder through the third pin. The movable arm of this scheme has a large amplitude modulation, which further improves the flexibility of the parachute pulling position.

[0013] The bottom of the support arm and the variable amplitude oil cylinder are fixed to the rotating bearing seat, the bottom of the rotating bearing seat is fixed to the base plate, and the base plate is fixed to the bottom plate of the heavy-duty loader. In this solution, the moving direction of the loader is not limited to the direction parallel to the wind; the boom and the support arm form a rotatable structure, which increases the functionality of the boom, so that the boom can also be used to hoist small equipment such as counterweights.

[0014] A lifting hook is provided on the lower side of the boom, and a rope reel for winding up the lifting wire rope is provided next to the lifting hook.

[0015] As another embodiment of the parachute dragging device:

[0016] The parachute dragging mechanism comprises a support frame, the bottom of the support frame is fixedly connected to a base plate, and the base plate is fixedly connected to the bottom plate of a heavy-duty loader; a bearing assembly is installed at both ends of the top of the support frame, and the two bearing assemblies are connected by a shaft rod; two lockers are symmetrically arranged on the shaft rod, and the two lockers are respectively connected to the parachute ropes on both sides of the wing parachute, and the parachute rope tension sensors are arranged in the lockers; an encoder for monitoring the rotation angle of the shaft rod is installed on the bearing assembly. This embodiment is specially used for the dragging of the wing parachute and has good balance.

[0017] As a preferred embodiment, a further technical solution of this embodiment is:

[0018] A connecting plate group is symmetrically arranged on both sides of the shaft rod, and the connecting plate group includes at least three teardrop-shaped connecting plates; the wide end of the teardrop-shaped connecting plate is tightly fitted on the shaft rod; the narrow end of the teardrop-shaped connecting plate is movably connected to the locker through a small pin shaft; the elevation angles of each teardrop-shaped connecting plate in a connecting plate group are different.

[0019] Further embodiments of the present invention include:

[0020] The parachute dragging mechanism of the present invention is provided with a first camera for photographing the image of the parachute ejector and a second camera for photographing the parachute opening process; the base plate is provided with a first die hole group for fixing the rotating bearing seat and a second die block group for fixing the supporting frame; the base plate is fixedly connected with the bottom plate of the heavy-duty loader by bolts.

[0021] The power distribution system and the electrical control box are installed on the bottom plate of the heavy-duty loader, between the cab of the heavy-duty loader and the parachute dragging mechanism; the data processing system is arranged in the electrical control box; the GPS speed sensor and the weather station are installed on the top of the electrical control box.

[0022] There is also a smoke generator on the top of the electrical control box, which can visualize the flow field conditions when shooting the parachute opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a drag parachute dragging mechanism installed on a loading vehicle of the present invention;

[0024] Figure 2 This is an overall diagram of the drag parachute dragging mechanism of the present invention;

[0025] Figure 3 It is a three-dimensional diagram of the drag parachute dragging mechanism of the present invention;

[0026] Figure 4 It is a partial structural exploded view of the movable arm and the supporting arm of the present invention;

[0027] Figure 5 This is a schematic diagram of the assembly state of the support arm and the supporting arm of the present invention;

[0028] Figure 6This is a diagram of the installation structure of the pitch frame of the present invention;

[0029] Figure 7 Schematic diagram of the installation structure of the lock and the parachute rope tension sensor;

[0030] Figure 8 This is a schematic diagram of a parafoil dragging mechanism installed on a loading vehicle of the present invention;

[0031] Fig. 9 It is a schematic diagram of the overall structure of the dragging mechanism of the parafoil of the present invention;

[0032] Fig.10 It is a three-dimensional diagram of the dragging mechanism of the parafoil of the present invention;

[0033] Fig.11 It is a schematic diagram of the locking structure of the parafoil dragging mechanism;

[0034] Fig.12 It is a schematic diagram of the parachute rope tension sensor and encoder of the parafoil dragging mechanism of the present invention.

[0035] In the figure: 1, bottom plate (heavy loader); 2, parachute drag mechanism; 3, counterweight; 4, electrical control box; 5, smoke device; 6, weather station; 7, parachute rope; 8, parachute body; 9, base plate; 10, parachute ejector; 11, first camera; 12, second camera; 13, second connecting plate; 14, first connecting plate; 15, first pin shaft; 16, second pin shaft; 17, third pin shaft; 18, fourth pin shaft;

[0036] 2-1, rotating bearing seat; 2-2, supporting arm; 2-3, variable amplitude cylinder; 2-4, hydraulic station; 2-5, movable arm; 2-6, angle adjustment cylinder; 2-7, pitch frame; 2-8, locker; 2-9, parachute rope tension sensor; 2-2-1, first axis hole; 2-2-2, second axis hole; 2-5-1, fixed axis hole; 2-5-2, movable axis hole; 2-7-1, double ear plate; 2-8-1, mounting plate; 2-8-2, rope locking cylinder; 2-8-3, clamping plate; 2-8-4, clamping arm; 2-8-5, D-type shackle;

[0037] 20. Support frame; 21. Bearing assembly; 22. Shaft; 23. Teardrop-shaped connecting plate. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0039] The mobile parachute opening test device provided by the present invention comprises a data acquisition device, a data processing system, a power distribution system and an electrical control box 4, wherein the data acquisition device comprises a GPS speed sensor, parachute rope tension sensors 2-9, a camera, a pitot tube and a weather station 6, and the data acquisition device, the data processing system, the power distribution system and the electrical control box 4 are assembled on a heavy-duty loader; the heavy-duty loader is also provided with a parachute dragging mechanism 2, and a parachute ejector 10 is arranged next to the parachute dragging device; the parachute body 8 is installed in the parachute ejector 10, and the parachute rope 7 is connected to the parachute dragging mechanism 2.

[0040] The parachute towing test vehicle provided by the present invention mainly tests the drag parachute and the wing parachute to observe their working performance. The drag parachute mainly verifies the correctness of the parachute opening procedure and the stability after the parachute is opened; the wing parachute mainly examines the flight stability and the correctness of the closing and unfolding process.

[0041] See also Figures 1 to 7 For the drag parachute, the structure of the parachute drag mechanism is:

[0042] The parachute dragging mechanism 2 includes a support arm 2-2 fixedly connected to the bottom plate 1 of the heavy-duty loader, and the upper end of the support arm 2-2 is connected to the boom 2-5; a pitch frame 2-7 is installed at the other end of the boom 2-5, and a double-ear plate 2-7-1 is provided at the lower back of the pitch frame 2-7, and the double-ear plate 2-7-1 is movably connected to the end of the boom 2-5 through a rotating shaft; an angle adjustment cylinder 2-6 is provided between the upper back of the pitch frame 2-7 and the boom 2-5, the piston end of the angle adjustment cylinder 2-6 is pin-connected to the pitch frame 2-7, and the fixed end of the angle adjustment cylinder 2-6 is pin-connected to the upper side of the boom 2-5; an umbrella rope tension sensor 2-9 is provided on the front of the pitch frame 2-7, and a locker 2-8 for fixing the umbrella rope 7 is installed on the umbrella rope tension sensor 2-9.

[0043] For details, see Figure 4 , Figure 5 The pitch frame 2-7 is a triangular structure frame, which is welded with steel structure rods. A mounting plate 2-8-1 is provided at each of the three corners of the pitch frame 2-7. A group of parachute rope tension sensors 2-9 and lockers 2-8 are installed on each mounting plate 2-8-1, and the parachute ropes 7 and slings of the drag parachute are installed on the three lockers 2-8. Each mounting plate 2-8-1 is radially arranged with the midpoint of the triangle as the center. A number of positioning holes are provided on the mounting plate 2-8-1. The parachute rope tension sensors 2-9 and lockers 2-8 are fixed in appropriate positions according to the requirements of the tested parachute. Of course, the mounting plate 2-8-1 can also be designed as a slide groove structure, and the parachute rope tension sensor 2-9 is connected to the slide groove (mounting plate 2-8-1) through a slider, and is equipped with a position adjustment fixing structure.

[0044] In the above embodiment, the pitch frame 2-7 is installed at the outer end of the movable arm 2-5, and the movable arm 2-5 and the support arm 2-2 can be fixedly connected. In this example, the movable arm 2-5 is actually a large boom structure. The parachute may be horizontal or upward after being released. In order to make the data collected by the parachute rope tension sensor 2-9 accurate, the locker 2-8 and the sensor should maintain a uniform straight line with the parachute rope 7. Therefore, the pitch frame 2-7 is designed as a rotatable structure, and the angle adjustment cylinder 2-6 automatically adjusts the angle of the pitch frame 2-7 according to the tension direction of the parachute rope 7 and the elevation angle of the parachute rope 7, so that the parachute rope tension sensor 2-9 and the locker 2-8 always maintain a straight line with the parachute rope 7.

[0045] The present invention is to conduct parachute opening test in natural environment, and the wind speed and wind direction depend on the natural wind situation. In the case of unstable wind direction or too large parachute elevation angle, only the pitch frame 2-7 in the above embodiment can rotate, and the adjustment angle may not meet the adaptability requirements. As an improvement of the above embodiment, the present invention further designs a movable structure: a variable-length oil cylinder 2-3 for adjusting the angle between the movable arm 2-5 and the support arm 2-2 is also provided under the movable arm 2-5, and the hydraulic station 2-4 of the variable-length oil cylinder 2-3 is installed on a heavy-duty loader.

[0046] The luffing cylinder 2-3 is controlled by an electrical control system. The extension length of the piston rod of the luffing cylinder 2-3 can adjust the height of the pitch frame 2-7. Through the luffing cylinder 2-3, the pitch frame 2-7 can be adjusted within a height range of 1m to 4m above the loading vehicle bottom plate 1. The length of the piston rod of the angle adjustment cylinder 2-6 can adjust the pitch angle of the pitch frame 2-7 based on the horizontal line.

[0047] Specifically, a fixed axis hole 2-5-1 is provided at the connecting end of the support arm 2-2 of the boom 2-5, and a movable axis hole 2-5-2 is provided in front of the fixed axis hole 2-5-1; a first axis hole 2-2-1 is provided at the upper end of the support arm 2-2, and a second axis hole 2-2-2 is provided at the lower rear position of the first axis hole 2-2-1; the first axis hole 2-2-1 overlaps with the fixed axis hole 2-5-1 and is installed with a first pin 15; the second axis hole 2-2-2 is connected to the first connecting plate 14 through the second pin 16; the movable axis hole 2-5-2 is connected to the second connecting plate 13 through the fourth pin 18; the free ends of the first connecting plate 14 and the second connecting plate 13 are connected to the piston end of the variable amplitude cylinder 2-3 through the third pin 17, and the bottom of the variable amplitude cylinder 2-3 is fixed beside the support arm 2-2. In this embodiment, the axis point of the variable amplitude cylinder 2-3 and the boom 2-5 is close to the axis point of the support column and the boom 2-5, and the swing distance of the boom 2-5 is large.

[0048] Due to the interaction between the tension of the parachute and the gravity of the test device after the parachute is opened, the static stability and dynamic stability of the vehicle are calculated to increase the stability of the test device and ensure that the static stability and dynamic stability of the test device meet the design requirements. Therefore, the test device counterweight 3 is added to make the load distribution of the test device more reasonable and safer. The counterweight 3 can be adjusted according to different test purposes. The counterweight 3 can be installed using the hoisting equipment invested when the above-mentioned towing mechanism is installed. After the towing mechanism is hoisted in, the counterweight 3 is hoisted in at the same time. However, it is preferred that the hoisting function is added to the above-mentioned large-arm type towing mechanism. Specifically, on the basis of the structure of the above-mentioned boom 2-5 with adjustable angle, it is further designed as a structure that can rotate as a whole: the bottom of the support arm 2-2 and the variable amplitude oil cylinder 2-3 are fixedly connected to the rotating bearing seat 2-1, the bottom of the rotating bearing seat 2-1 is fixedly connected to the base plate 9, and the base plate 9 is fixedly connected to the bottom plate 1 of the heavy-duty loader. A hoisting hook is provided on the lower side of the boom 2-5, and a rope reel for winding the hoisting wire rope is provided next to the hoisting hook. When the counterweight 3 needs to be installed, the wire rope is released, and the lower end is connected to the counterweight 3. The counterweight 3 is hoisted from the ground to the bottom plate 1 of the loading vehicle and fixed by controlling the action of the support arm 2-2 and the boom 2-5 by rotating the bearing seat 2-1 and the variable amplitude cylinder 2-3. The counterweight 3 is installed by the boom 2-5 with less power, and the appropriate installation position of the counterweight 3 can be checked at the same time during installation.

[0049] See also Figure 2 , Figure 3 A first camera 11 for photographing the parachute ejector 10 is provided at the bottom of the boom 2-5; a second camera 12 for photographing the parachute opening process is provided in the middle of the pitch frame 2-7 and on both sides of the boom 2-5.

[0050] See also Figure 7 The locker 2-8 structure for fixing the drag parachute rope 7 includes a rope locking cylinder 2-8-2, two parallel clamping plates 2-8-3 are arranged on the left and right of the rope locking cylinder 2-8-2, one end of the two clamping plates 2-8-3 is connected to the rope tension sensor 2-9; the other end is installed with a D-type shackle 2-8-5, and the parachute rope 7 is passed through the D-type shackle 2-8-5; the piston end of the rope locking cylinder 2-8-2 is connected to the clamping arm 2-8-4, the piston end retracts the clamping arm 2-8-4 to close and clamp the parachute rope 7, and the piston end extends, and the clamping arm 2-8-4 opens to release the parachute rope 7.

[0051] See also Figures 8 to 12 As shown, for the parafoil, the structure of the parachute drag mechanism is:

[0052] The parachute dragging mechanism 2 includes a support frame 20, the bottom of the support frame 20 is fixed to the base plate 9, and the base plate 9 is fixed to the bottom plate 1 of the heavy-duty loader; a bearing assembly 21 is installed at both ends of the top of the support frame 20, and the two bearing assemblies 21 are connected by an axle rod 22; two lockers 2-8 are symmetrically arranged on the left and right of the axle rod 22, and the two lockers 2-8 are respectively connected to the parachute ropes 7 on both sides of the wing parachute, and a parachute rope tension sensor 2-9 is arranged in the locker 2-8; an encoder for monitoring the rotation angle of the axle rod 22 is installed on the bearing assembly 21.

[0053] A connecting plate group is symmetrically arranged on both sides of the shaft rod 22, and the connecting plate group includes at least three teardrop-shaped connecting plates 23; the wide end of the teardrop-shaped connecting plate 23 is tightly fitted on the shaft rod 22; the narrow end of the teardrop-shaped connecting plate 23 is movably connected to the locker 2-8 through a small pin; the elevation angles of each teardrop-shaped connecting plate 23 in a connecting plate group are different.

[0054] A first camera 11 for photographing the parachute ejector 10 and a second camera 12 for photographing the parachute opening process are installed in the middle of the shaft 22 .

[0055] The locker 2-8 for fixing the parafoil rope 7 comprises an axial end movably connected to the teardrop-shaped connecting plate 23, and a U-shaped buckle for connecting the rope 7. The rope tension sensor 2-9 is installed between the axial end and the U-shaped buckle. The tension applied to the U-shaped buckle is directly transmitted to the rope tension sensor 2-9, and the rope tension sensor 2-9 transmits the tension value to the data processing system.

[0056] The present invention adopts a 6×4 second-class truck, including a chassis, a subframe, a car body structure such as a carriage. The present invention provides a mobile parachute opening test inspection station, on which a parachute dragging device, a power distribution system, an electrical control box 4 and other equipment required for the parachute opening test are installed. The corresponding parachute dragging mechanism 2 is selected and used according to the type of parachute to be tested. For example, the parachute dragging mechanism 2 for the drag parachute and the parachute dragging mechanism 2 designed for the wing parachute are both installed on a base plate 9, on which a first die hole group for fixing the rotating bearing seat 2-1 is provided, and a second die block group for fixing the support frame 20 is also provided; the base plate 9 is bolted to the bottom plate 1 of the heavy-duty loader. The data processing system is arranged in the electrical control box 4; the GPS speed sensor and the weather station 6 are installed on the top of the electrical control box 4. And other equipment required for the parachute test is also installed on the heavy-duty loader.

[0057] The parachute dragging device is installed in the middle of the car floor 1; a parachute ejector 10 is configured, and the parachute ejector 10 is provided with wireless remote control and installation interfaces of other models and equipment. It can withstand various loads in the test. The parachute ejector 10 has wired and wireless remote control release functions, and can be started by various modes such as program control, ground remote control, cockpit emergency control and platform attitude monitoring automatic control. The release structure of the parachute ejector 10 adopts a mechanical or electromagnetic design structure, which can be used repeatedly and reliably to separate the parachute strap from the parachute cabin.

[0058] The data acquisition device includes a variety of components for detecting various environmental data, status data and parachute opening process data. For example, the weather station 6 and pitot tube for monitoring environmental data; the GPS, the first camera 11, the parachute rope tension sensor 2-9, the encoder (for monitoring the angle of the parachute rope 7), etc. for monitoring status data; the first camera 11 and the second camera 12 for recording the parachute opening process. The signals of each component of the data acquisition device are transmitted to the data processing system for recording and management. The data acquisition device is connected to the data processing system, and the data processing system records and analyzes the various data obtained, and finally obtains the parachute test data.

[0059] The data acquisition device selects appropriate components according to the specific test needs. The following is a detailed description of the various components of the data acquisition device:

[0060] 1. A weather station 6 for detecting the temperature, humidity, atmospheric pressure, wind speed and wind direction of the air in the natural environment. According to the actual measurement occasion, a mobile comprehensive observation weather station 6 designed specifically for environmental detection equipment such as vehicles is selected. The weather station 6 consists of an integrated mounting bracket, a data acquisition instrument and a power supply system. The data measured by the weather station 6 can be transmitted to the data processing system of the computer terminal via wired or wireless communication. The data communication of the weather station 6 adopts the standard RS232 / 485 communication function and supports the MODBUS communication protocol. The measurement data can be transmitted to the data processing system via mobile wireless GPRS or wireless data transmission radio, providing a measurement environment basis for on-site testing. Real-time speed measurement function, accuracy ±0.2m / s.

[0061] 2. Pitot tube for detecting wind pressure (dynamic pressure, static pressure). Real-time speed pressure (dynamic pressure, static pressure) signal - speed pressure sensor (pitot tube), Y / GDJ-105D atmospheric data module, completes the perception and measurement of atmospheric total pressure and atmospheric static pressure. At the same time, it calculates atmospheric parameter information such as absolute pressure altitude, indicated airspeed, and ascent and descent speed. It is sent to the receiver via two independent RS-422 digital buses. Static pressure measurement and real-time speed pressure measurement functions, with an accuracy better than ±1pa.

[0062] 3. GPS speed sensor used to detect the moving speed of this mobile base station. The SDI-COMPASS Beidou / GPS dual antenna positioning and directional receiver is used to complete the speed measurement function.

[0063] 4. Set up a video recorder to record the entire parachute opening process at an appropriate location according to the detection target.

[0064] High-speed video recording: According to the measurement requirements, the high-speed camera uses a FR-340-10G high-speed digital camera, which is transmitted to the storage computer via a 10G optical fiber;

[0065] Ordinary wide-angle camera: In the parachute drag test system, a high-speed camera is required to shoot the parachute opening and movement process. In addition, an ordinary wide-angle camera is required to record and monitor the entire test process in real time. Among them, the ordinary wide-angle camera is equipped with a fixed-point anti-vibration vehicle-mounted pan-tilt camera, model: WL-AHD;

[0066] Ordinary cameras and ordinary image acquisition should be used for convenient and flexible installation.

[0067] 5. Set the tension detection element of the parachute rope 7 according to the detection target.

[0068] Three-way tension sensor: also called "three-dimensional force sensor". It can be used in the drag parachute drag mechanism to measure the tension of the parachute rope 7 and the sling. The range includes 500kg, 2T, 5T, and 10T. The measurement accuracy is no more than 0.02% of the full range. The interface is located near the platform interface and has 1-3 connection points.

[0069] Tension and pressure sensor --- interface cylindrical force sensor WMC. It can be used in the parafoil drag mechanism to measure the unidirectional tension of the parachute rope. The measuring range is 100kg, 250kg, and 500kg. The measuring accuracy is not more than 0.5% of the full scale. The weight is not more than 100g. The measuring points are not less than 10 and the distance from the platform interface is not more than 25m.

[0070] The mobile parachute opening test device provided by the present invention is also equipped with an overload measurement device - an acceleration sensor, which measures the impact of the parachute opening process, and the impact range is 10g~1000g. The overload measurement sensor uses an American PCB acceleration sensor, which has the following characteristics: small size, light weight, high sensitivity, and little effect of the added mass on the test itself. It can be applied to high-sensitivity measurement, high-frequency vibration testing, NVH research, etc.

[0071] This test device also has a pressure altitude test function, which can measure the altitude from 0 to 20 km with a measurement accuracy better than 0.3%.

[0072] Furthermore, a smoke device 5 is also provided on the top of the electrical control box 4 of the present invention, which is used to visualize the flow field during operation. Specifically, when the camera is shooting the parachute opening process, the smoke can clearly show the airflow in the air environment at that time, which is more conducive to understanding the parachute opening situation.

[0073] The test vehicle equipped with the test system moves in a straight line on a specific route to simulate the dynamic pressure conditions of parachute opening. The data acquisition device and the data processing system are started in advance before the parachute towing test vehicle starts. When the heavy-duty loader reaches the test speed, the parachute release device ejects the parachute. During the start-up process, the data acquisition device maintains the data acquisition state, collects and records the signals of various sensors on the parachute and in the environment, including tension, wind speed and other signals, and simultaneously records the parachute opening video information shot by a digital camera, and the video sampling frequency is not less than 10kHz. All collected videos and measurement data should have a unified time system and be stored in real time, and can be directly transmitted to the data processing system at high speed through data interfaces such as mobile media and network cables. The data storage time is not less than 5 hours, and the data system is downloaded in real time for ground judgment.

[0074] If the natural environment conditions of the test permit, it also has the ability to launch a parachute at zero initial velocity.

[0075] The invention can make linear motion on a specific route, simulating the dynamic pressure conditions of parachute opening that are closer to the real ones. The parachute towing detection vehicle of the invention has simple structure, good stability, high automation, and is suitable for industrial promotion.

[0076] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A mobile parachute opening test device, comprising a data acquisition device, a data processing system, a power distribution system and an electrical control box (4), wherein the data acquisition device is connected to the data processing system; the data acquisition device comprises a GPS speed sensor, a parachute rope tension sensor (2-9), a camera, a pitot tube and a weather station (6), characterized in that: The data acquisition device, data processing system, power distribution system and electrical control box (4) are mounted on a heavy-duty loader; the heavy-duty loader is also provided with a parachute dragging mechanism (2), and a parachute ejector (10) is provided next to the parachute dragging mechanism (2); the parachute body (8) is installed in the parachute ejector (10), and the parachute rope (7) is connected to the parachute dragging mechanism (2); The parachute dragging mechanism (2) comprises a support arm (2-2) fixedly connected to the bottom plate (1) of the heavy-duty loader; the upper end of the support arm (2-2) is connected to a movable arm (2-5); a fixed axis hole (2-5-1) is provided at the connecting end of the support arm (2-2) of the movable arm (2-5); a movable axis hole (2-5-2) is provided in front of the fixed axis hole (2-5-1); a first axis hole (2-2-1) is provided at the upper end of the support arm (2-2); a second axis hole (2-2-1) is provided below and behind the first axis hole (2-2-1); The first shaft hole (2-2-1) and the fixed shaft hole (2-5-1) overlap and are provided with a first pin (15); the second shaft hole (2-2-2) is connected to the first connecting plate (14) via a second pin (16); the movable shaft hole (2-5-2) is connected to the second connecting plate (13) via a fourth pin (18); the free ends of the first connecting plate (14) and the second connecting plate (13) are connected to the piston end of the variable amplitude oil cylinder (2-3) via a third pin (17); A variable-length oil cylinder (2-3) for adjusting the included angle between the movable arm (2-5) and the supporting arm (2-2) is also provided. The bottom of the variable-length oil cylinder (2-3) is fixed beside the supporting arm (2-2). The hydraulic station (2-4) of the variable-length oil cylinder (2-3) is installed on a heavy-duty loading vehicle. A pitch frame (2-7) is installed at the other end of the boom (2-5), and a double-ear plate (2-7-1) is provided at the lower back of the pitch frame (2-7), and the double-ear plate (2-7-1) is movably connected to the end of the boom (2-5) through a rotating shaft; an angle adjustment cylinder (2-6) is provided between the upper back of the pitch frame (2-7) and the boom (2-5), and the piston end of the angle adjustment cylinder (2-6) is pin-connected to the pitch frame (2-7), and the fixed end of the angle adjustment cylinder (2-6) is pin-connected to the upper side of the boom (2-5); a parachute rope tension sensor (2-9) is provided at the front of the pitch frame (2-7), and a locker (2-8) for fixing the parachute rope (7) is installed on the parachute rope tension sensor (2-9).

2. The mobile parachute opening test device according to claim 1, characterized in that: The pitch frame (2-7) is a triangular structure frame. Each of the three corners of the pitch frame (2-7) is provided with a mounting plate (2-8-1). A group of parachute rope tension sensors (2-9) and lockers (2-8) are respectively mounted on each mounting plate (2-8-1). Parachute ropes (7) and slings of a drag parachute are respectively mounted on the three lockers (2-8). Each mounting plate (2-8-1) is radially arranged with the midpoint of the triangle as the center. A plurality of positioning holes are provided on the mounting plate (2-8-1). The parachute rope tension sensors (2-9) and lockers (2-8) are fixed at appropriate positions according to the requirements of the parachute to be tested.

3. The mobile parachute opening test device according to claim 1, characterized in that: The locker (2-8) comprises a rope locking cylinder (2-8-2). Two parallel clamping plates (2-8-3) are arranged on the left and right of the rope locking cylinder (2-8-2). One end of the two clamping plates (2-8-3) is connected to the parachute rope tension sensor (2-9); the other end is equipped with a D-shaped shackle (2-8-5), and the parachute rope (7) is passed through the D-shaped shackle (2-8-5); the piston end of the rope locking cylinder (2-8-2) is connected to the clamping arm (2-8-4), the piston end retracts the clamping arm (2-8-4) to close and clamp the parachute rope (7), and the piston end extends, and the clamping arm (2-8-4) opens to release the parachute rope (7).

4. The mobile parachute opening test device according to claim 1, characterized in that: The bottoms of the support arm (2-2) and the variable amplitude oil cylinder (2-3) are fixedly connected to the rotating bearing seat (2-1); a first die hole group for fixing the rotating bearing seat (2-1) is provided on the base plate (9); and the bottom of the rotating bearing seat (2-1) is fixedly connected to the base plate (9); and the base plate (9) is fixedly connected to the bottom plate (1) of the heavy-duty loader by bolts.

5. The mobile parachute opening test device according to claim 4, characterized in that: A lifting hook is provided at the lower side of the boom (2-5), and a rope reel for winding up the lifting wire rope is provided next to the lifting hook.

6. The mobile parachute opening test device according to claim 5, characterized in that: The parachute dragging mechanism (2) is provided with a first camera (11) for photographing an image of the parachute ejector (10), and a second camera (12) for photographing a parachute opening process.

7. The mobile parachute opening test device according to claim 5, characterized in that: The power distribution system and the electrical control box (4) are mounted on the bottom plate (1) of the heavy-duty loader and are located between the cab of the heavy-duty loader and the parachute dragging mechanism (2); the data processing system is arranged in the electrical control box (4); and the GPS speed sensor and the weather station (6) are installed on the top of the electrical control box (4).

8. The mobile parachute opening test device according to claim 7, characterized in that: A smoke generating device (5) is also provided on the top of the electrical control box (4).

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