CN117163318B - Electromagnetic ejection-based aircraft landing gear running obstacle crossing impact test device and method - Google Patents
Electromagnetic ejection-based aircraft landing gear running obstacle crossing impact test device and method Download PDFInfo
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Abstract
The invention discloses an electromagnetic ejection-based landing gear running obstacle crossing impact test device and method for an aircraft, wherein the device comprises a test track, a test bench, a landing gear and an anti-falling device; a sliding plate is arranged on the test track, a linear motor is arranged on the test track, and an obstacle boss is arranged on the sliding plate; the test track consists of an electromagnetic acceleration track and an electromagnetic deceleration track; the electromagnetic speed reducing rail is provided with a hydraulic braking device and an emergency speed reducing device, a hanging basket is arranged in the test bed, and the test bed is provided with data acquisition equipment; the anti-falling device comprises a bearing plate, a fixed pulley, a connecting rope and a self-locking mechanism. According to the test device disclosed by the invention, the electromagnetic ejection technology is adopted to accelerate the sliding plate, the landing gear is not impacted for many times even if the test device fails, damage to a landing gear test piece is avoided, and the three layers of deceleration areas are arranged on the test track, so that potential safety hazards in the test process can be reduced.
Description
Technical Field
The invention relates to the technical field of airplane tests, in particular to an airplane landing gear running obstacle-surmounting impact test device and method based on electromagnetic ejection.
Background
Before the aircraft takes off, a certain take-off speed needs to be achieved, so that a running acceleration process needs to be carried out on the ground, and as a result, some obstacles can appear on the runway, when the wheels of the landing gear are pressed against the obstacles, the landing gear can bump, so that the normal running acceleration of the aircraft is influenced to a certain extent. Firstly, because the dynamic friction coefficient of the surface of the obstacle is different from that of the runway to a certain extent, the speed of the aircraft is difficult to control when the aircraft passes over the obstacle, so that the take-off speed of the aircraft is influenced, and the abrupt friction force can also cause abrasion of the aircraft wheels to influence the normal work of the landing gear. In addition, since the strut is instantaneously contracted when the landing gear passes over the obstacle, if the contraction amount exceeds the maximum stroke when the strut is designed, the landing gear and even the airplane are irreversibly damaged, and therefore, the landing gear needs to be subjected to a running obstacle-crossing test.
The existing obstacle surmounting device can cause the landing gear to surmount the obstacle for a plurality of times in a short time under the condition of improper control or equipment failure, and damage is caused to the landing gear test piece. Therefore, an apparatus and a method for an electromagnetic ejection-based landing gear running obstacle-surmounting impact test are needed to overcome the above drawbacks.
Disclosure of Invention
In order to solve the technical problems, the invention provides an airplane landing gear running obstacle-surmounting impact test device and method based on electromagnetic ejection.
The technical scheme of the invention is as follows: the landing gear running obstacle crossing impact test device based on electromagnetic ejection comprises a test track laid on the ground, a test bed arranged on the test track, a landing gear hung on the test bed and an anti-falling device arranged on the test bed;
the test track is provided with a sliding plate in sliding connection with the test track, the test track is provided with a linear motor, the sliding plate is fixedly connected with a rotor of the linear motor, and the sliding plate is provided with a barrier boss; the test track is divided into an electromagnetic acceleration track and an electromagnetic deceleration track along the movement direction of the sliding plate;
the electromagnetic speed reduction rail is sequentially and fixedly provided with a hydraulic braking device and an emergency speed reduction device which are used for reducing the speed of the sliding plate along the movement direction of the sliding plate;
the test bench is internally provided with a hanging basket which is in sliding connection with the test bench, the upper end of the hanging basket is connected with lifting equipment through a rope, the landing gear is fixedly connected with a mounting rack arranged on the bottom surface of the hanging basket, and the test bench is provided with data acquisition equipment for acquiring landing gear running obstacle crossing data;
the anti-falling device comprises a bearing plate arranged on the hanging basket and used for placing a balancing weight, a fixed pulley fixedly arranged on the test bed, a connecting rope with one end fixedly connected with the bearing plate, and a self-locking mechanism arranged on the hanging basket and used for locking the connecting rope, wherein the other end of the connecting rope bypasses the fixed pulley and is connected with the self-locking mechanism.
Description: according to the test device, the electromagnetic ejection technology is utilized to accelerate the sliding plate, the sliding plate can be rapidly accelerated to the preset speed in a short time, the landing gear cannot be impacted for many times even if the test device fails, damage to a landing gear test piece is avoided, and the three-layer deceleration area is arranged on the test track, so that potential safety hazards in the test process can be effectively reduced.
Further, the emergency speed reducing device comprises a braking blocking platform fixedly connected with the test track and a blocking net which is vertical to the ground and fixedly connected with the test track, and the braking blocking platform is fixedly connected with the blocking net through elastic ropes.
Description: the braking blocking platform can intercept the sliding plate, prevent the sliding plate from flying out of the track, absorb the kinetic energy of the braking blocking platform through the blocking net and improve the use safety of the test device.
Further, the obstacle boss is detachably connected with the sliding plate.
Description: the detachable design is adopted, so that the obstacle bosses with different shapes can be conveniently replaced according to test requirements, and obstacles with different shapes can be truly simulated.
Further, the mounting frame is connected with the landing gear through a clamp.
Description: connect through anchor clamps, be convenient for change undercarriage test piece when firm in connection, and easily adjust the fixed angle of undercarriage.
Further, the test bench comprises upright posts fixedly connected with the test tracks and connecting frames arranged at the upper ends of the upright posts, four upright posts are arranged, guide rails are arranged on the side walls of the upright posts, and pulleys used for carrying out sliding connection with the four guide rails in one-to-one correspondence are arranged on the hanging basket.
Description: the guide rail is in sliding connection with the pulley, so that friction resistance can be effectively reduced, abrasion of the hanging basket is reduced, and the service life of the hanging basket is prolonged.
Further, the bearing plate is in sliding connection with a sliding column arranged on the hanging basket, the fixed pulleys are fixedly connected with the connecting frame, two self-locking mechanisms are arranged, the two self-locking mechanisms are respectively arranged on two sides of the hanging basket, and the connecting rope and the fixed pulleys are respectively provided with two self-locking mechanisms and correspond to the self-locking mechanisms one by one;
the self-locking mechanism comprises a spool transversely arranged above the hanging basket, a brake box and a spring box, wherein the brake box and the spring box are fixedly arranged on the hanging basket;
an inner gear ring is arranged in the brake box, a rotating rod is arranged at one end of the spool, an inertia wheel is sleeved on the rotating rod, an adjusting hole for adjusting the inertia wheel to deflect by utilizing the rotation of the rotating rod is formed in the inertia wheel, a clamping groove in rotating clamping connection with one end of the rotating rod and an arc-shaped groove in swinging clamping connection with the other end of the rotating rod are formed in the adjusting hole, and teeth meshed with the inner gear ring by utilizing the deflection of the inertia wheel are formed in the side wall of the inertia wheel; the spool in the spring box is sleeved with a clockwork spring.
Description: when the hanging basket normally goes up and down, the spool can receive and release the connecting cable automatically, avoids influencing the normal operation of hanging basket, and when the hanging basket stall falls, the dwang can promote the flywheel deflection under inertial action, makes flywheel and ring gear meshing, makes the spool unable rotation, and along with the hanging basket continues to descend, the connecting cable can pull the loading board and rise, makes the balancing weight become the resistance of hanging basket downward movement, lightens hanging basket weight when slowing down hanging basket descent speed, avoids taking place danger.
Further, the bearing plate is provided with a mounting groove for placing the balancing weight.
Description: the balancing weight can be placed in the mounting groove, so that the balancing weight is prevented from falling off the bearing plate when the hanging basket is lifted, and the safety of the test device is improved.
Further, the inner gear ring is in limit rotation connection with the brake box, two first clamping blocks are fixedly connected to the side wall of the brake box, second clamping blocks corresponding to the two first clamping blocks one by one are fixedly connected to the inner gear ring, arc-shaped air bags are arranged between the two first clamping blocks and the corresponding second clamping blocks, and the arc-shaped air bags are fixedly connected with the corresponding first clamping blocks;
the hanging baskets on two sides of each pulley are respectively provided with a connecting plate, two ends of a rotating shaft of each pulley are respectively connected with the corresponding connecting plates in a rotating way, the pulleys are in sliding connection with the rotating shaft, one connecting plate is provided with an air pressure rod which pushes the pulleys to slide on the rotating shaft by inflation, the rotating shaft between the other connecting plate and the pulleys is sleeved with a spring, and the air pressure rods of the two pulleys on the same side with the self-locking mechanism are respectively communicated with two arc-shaped air bags of the self-locking mechanism in a one-to-one correspondence way through a guide pipe;
one side is equipped with a plurality of bosss that are used for carrying out the speed reduction to the hanging flower basket with pulley sliding fit in the guide rail.
Description: because the annular gear is in limit rotation connection with the brake box, when the flywheel is meshed with the annular gear, the annular gear can firstly rotate along with the flywheel until the annular gear is limited and can not rotate to clamp the flywheel, and during the rotation of the annular gear, the second clamping block can rotate along with the annular gear and extrude the arc-shaped air bag, so that the pneumatic rod is inflated and elongated to push the pulley to transversely slide, and the boss on the guide rail can limit the pulley to move downwards, so that the hanging basket is prevented from continuously falling.
The invention also provides an electromagnetic ejection-based landing gear running obstacle-surmounting impact test method, which is based on the landing gear running obstacle-surmounting impact test device and comprises the following steps:
s1, preparing: the weight of the balancing weight in the hanging basket is adjusted, the hanging basket is driven to ascend through hoisting equipment, so that the lifting frame height is adjusted, and the landing gear is in full contact with the sliding plate;
s2, performing impact test: starting the linear motor, and enabling a rotor of the linear motor to drive the sliding plate to accelerate on the electromagnetic acceleration track until the obstacle boss passes through the test bed, and measuring and recording the loading and movement conditions of the landing gear through the data acquisition equipment;
s3, resetting the sliding plate: after the test is finished, the mover of the linear motor drives the sliding plate to start electromagnetic speed reduction on the electromagnetic speed reduction track; if the electromagnetic speed reduction fails, the hydraulic braking device is used for hydraulic braking of the sliding plate; if the hydraulic braking fails, the sliding plate can collide with the emergency speed reducing device to carry out emergency braking, and then the sliding plate is reset.
Description: according to the test method, the obstacle boss with lighter mass is accelerated, the obstacle-climbing working condition simulation of sliding is realized by utilizing the relative motion between the obstacle boss and the landing gear, the landing gear with heavier mass is prevented from being directly accelerated, the landing gear test piece can be prevented from being damaged under the condition of high-speed motion, and the landing gear is fixed so as to be convenient for adjusting the counterweight of the hanging basket.
The beneficial effects of the invention are as follows:
(1) The device disclosed by the invention has the advantages that the electromagnetic ejection technology is utilized to accelerate the sliding plate, the sliding plate can be rapidly accelerated to a preset speed in a short time, the landing gear is not impacted for many times even if the test device fails, the damage to a landing gear test piece is avoided, and the three layers of deceleration areas are arranged on the test track, so that the potential safety hazard in the test process can be effectively reduced;
(2) When the hanging basket is stalled and falls, the rotating rod pushes the inertia wheel to deflect under the inertia action, so that the inertia wheel is meshed with the inner gear ring to limit the rotation of the spool, and the connecting cable pulls the bearing plate to rise along with the continuous falling of the hanging basket, so that the balancing weight becomes the resistance of the downward movement of the hanging basket, the falling speed of the hanging basket is slowed down, the weight of the hanging basket is reduced, and the danger is avoided;
(3) When the inertia wheel is meshed with the inner gear ring, the inner gear ring firstly rotates along with the inertia wheel until the inner gear ring is limited and can not rotate, the inertia wheel is blocked, and during the rotation of the inner gear ring, the second clamping block rotates along with the inner gear ring and extrudes the arc-shaped air bag, so that the air pressure rod is inflated to extend to push the pulley to transversely slide, and the pulley is limited to move downwards by the boss on the guide rail, so that the hanging basket is prevented from continuously falling;
(4) According to the test method, the obstacle boss with lighter mass is accelerated, the obstacle-crossing working condition simulation of sliding is realized by utilizing the relative motion between the obstacle boss and the landing gear, the landing gear with heavier mass is prevented from being directly accelerated, the landing gear test piece can be prevented from being damaged under the condition of high-speed motion, and the landing gear is fixed so as to be convenient for adjusting the counterweight of the hanging basket.
Drawings
FIG. 1 is a schematic view showing the overall structure of a test apparatus according to embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a test stand according to embodiment 1 of the present invention;
FIG. 3 is a schematic view of a basket according to embodiment 1 of the present invention;
FIG. 4 is an enlarged view at A of FIG. 3;
fig. 5 is a schematic view showing the internal structure of a brake case according to embodiment 1 of the present invention;
FIG. 6 is a flow chart of the test method of example 2 of the present invention;
fig. 7 is a schematic view showing the internal structure of a brake case according to embodiment 3 of the present invention;
fig. 8 is a schematic view of a pulley structure according to embodiment 3 of the present invention;
fig. 9 is a schematic view of a rail structure of embodiment 3 of the present invention;
the device comprises a 1-test track, a 11-electromagnetic acceleration track, a 12-electromagnetic deceleration track, a 13-slide plate, a 14-obstacle boss, a 15-hydraulic braking device, a 16-emergency speed reduction device, a 161-braking stopping platform, a 162-stopping net, a 2-test bench, a 21-upright post, a 22-connecting frame, a 23-hanging basket, a 231-pulley, a 232-connecting plate, a 233-slide column, a 234-air pressure rod, a 24-mounting frame, a 25-bearing plate, a 3-self-locking mechanism, a 31-spool, a 311-connecting rope, a 32-braking box, a 321-first clamping block, a 322-arc-shaped air bag, a 33-spring box, a 34-fixed pulley, a 35-rotating rod, a 36-inertia wheel, a 361-clamping groove, a 362-arc-shaped groove, a 37-inner gear ring, 371-second clamping block and a 4-landing gear.
Detailed Description
The invention will be described in further detail with reference to the following embodiments to better embody the advantages of the invention.
Example 1: as shown in fig. 1, an electromagnetic ejection-based landing gear running obstacle crossing impact test device for an aircraft comprises a test track 1 paved on the ground, a test bed 2 arranged on the test track 1, a landing gear 4 hung on the test bed 2 and an anti-falling device arranged on the test bed 2;
the test track 1 is provided with a sliding plate 13 which is in sliding connection with the test track 1, the test track 1 is provided with a linear motor, the linear motor adopts the products in the prior art, the sliding plate 13 is fixedly connected with a rotor of the linear motor, and the sliding plate 13 is provided with a barrier boss 14; the test track 1 is divided into an electromagnetic acceleration track 11 and an electromagnetic deceleration track 12 along the movement direction of the slide plate 13;
a hydraulic braking device 15 and an emergency speed reducing device 16 for reducing the speed of the sliding plate 13 are sequentially and fixedly arranged on the electromagnetic speed reducing rail 12 along the movement direction of the sliding plate 13, and the hydraulic braking device 15 adopts the products in the prior art;
the emergency speed reducer 16 comprises a braking blocking platform 161 fixedly connected with the test track 1 and a blocking net 162 which is vertical to the ground and fixedly connected with the ground, and the braking blocking platform 161 is fixedly connected with the blocking net 162 through elastic ropes; the barrier boss 14 is detachably connected with the sliding plate 13 through threads arranged on the barrier boss; the mounting frame 24 is connected with the landing gear 4 through a clamp, and the clamp adopts the prior art product;
as shown in fig. 2 and 3, a basket 23 in sliding connection with the test bench 2 is arranged in the test bench 2, the upper end of the basket 23 is connected with hoisting equipment through a rope, the hoisting equipment is a product in the prior art, the landing gear 4 is fixedly connected with a mounting frame 24 arranged on the bottom surface of the basket 23, and the test bench 2 is provided with data acquisition equipment for acquiring landing gear 4 sliding obstacle crossing data, wherein the data acquisition equipment comprises a linear displacement sensor for measuring the stroke of a buffer post of the landing gear 4, a laser displacement sensor for measuring the gravity center displacement of the basket 23, and a force sensor for measuring the course load and the vertical load of the landing gear 4, and the linear displacement sensor, the laser displacement sensor and the force sensor all adopt the prior art;
the anti-falling device comprises a bearing plate 25 arranged on a hanging basket 23 and used for placing a balancing weight, a fixed pulley 34 fixedly arranged on a test bench 2, a connecting rope 311 fixedly connected with the bearing plate 25 at the left end, and a self-locking mechanism 3 arranged on the hanging basket 23 and used for locking the connecting rope 311, wherein the right end of the connecting rope 311 bypasses the fixed pulley 34 and is connected with the self-locking mechanism 3; the bearing plate 25 is provided with a mounting groove for placing a balancing weight;
the test bed 2 comprises four upright posts 21 fixedly connected with the test track 1 and connecting frames 22 arranged at the upper ends of the upright posts 21, guide rails are arranged on the side walls of the four upright posts 21, and pulleys 231 which are in one-to-one corresponding sliding connection with the four guide rails are arranged on the hanging basket 23;
the bearing plate 25 is in sliding connection with a sliding column 233 arranged on the hanging basket 23, the fixed pulleys 34 are fixedly connected with the connecting frame 22, two self-locking mechanisms 3 are arranged, the two self-locking mechanisms 3 are respectively arranged on the left side and the right side of the hanging basket 23, and the two connecting ropes 311 and the two fixed pulleys 34 are respectively arranged and correspond to the self-locking mechanisms 3 one by one;
as shown in fig. 4, the self-locking mechanism 3 comprises a spool 31 transversely arranged above the hanging basket 23, a brake box 32 and a spring box 33 fixedly arranged on the hanging basket 23, wherein the front end of the spool 31 passes through the brake box 32 and is rotationally connected with the brake box, the rear end of the spool 31 passes through the spring box 33 and is rotationally connected with the spring box, and the right end of the connecting cable 311 is fixedly wound on the spool 31;
as shown in fig. 5, an inner gear ring 37 is disposed in the brake box 32, a rotating rod 35 is disposed at the front end of the spool 31, an inertia wheel 36 is sleeved on the rotating rod 35, an adjusting hole for adjusting the inertia wheel 36 to deflect by rotating the rotating rod 35 is disposed on the inertia wheel 36, a clamping groove 361 rotationally clamped with the right end of the rotating rod 35 and an arc-shaped groove 362 swingably clamped with the left end of the rotating rod 35 are disposed in the adjusting hole, and teeth meshed with the inner gear ring 37 by deflecting the inertia wheel 36 are disposed on the side wall of the inertia wheel 36; the spool 31, which is located in the spring case 33, is sheathed with a clockwork spring, which is a prior art product.
The working principle of the anti-falling device is as follows: when the hanging basket 23 is lifted normally, the flywheel 36 is not meshed with the inner gear ring 37, the rotating rod 35 can drive the flywheel 36 to rotate normally, and under the action of the spring, the spool 31 can lift and rotate along with the hanging basket 23 so as to automatically retract the connecting cable 311, and at the moment, the weight of the balancing weight acts on the hanging basket 23 normally;
when the hanging basket 23 stalls and descends, the rotating speed of the spool 31 is increased, under the inertia effect, the rotating rod 35 pushes the inertia wheel 36 to deflect the inertia wheel 36, at the moment, the inertia wheel 36 is meshed with the inner gear ring 37, the spool 31 cannot rotate, the connecting cable 311 can pull the bearing plate 25 to slide upwards along with the continuous descending of the hanging basket 23, at the moment, the balancing weight on the bearing plate 25 can become the descending resistance of the hanging basket 23, and the descending speed of the hanging basket 23 is reduced while the weight of the hanging basket 23 is lightened.
Example 2: the embodiment describes an electromagnetic ejection-based aircraft landing gear running obstacle-surmounting impact test method, and the aircraft landing gear running obstacle-surmounting impact test device in embodiment 1 is based on, as shown in fig. 6, and comprises the following steps:
s1, preparing: the weight of the balancing weight in the hanging basket 23 is adjusted, the hanging basket 23 is driven to ascend by the lifting equipment, so that the height of the landing gear 4 is adjusted, and the landing gear 4 is in full contact with the sliding plate 13;
s2, performing impact test: starting the linear motor, and enabling a rotor of the linear motor to drive the sliding plate 13 to accelerate on the electromagnetic acceleration track 11 until the obstacle boss 14 passes through the test bed 2, and measuring and recording the loading and movement conditions of the landing gear 4 through the data acquisition equipment;
s3, resetting the slide plate 13: after the test is finished, the mover of the linear motor drives the sliding plate 13 to start electromagnetic deceleration on the electromagnetic deceleration track 12; if the electromagnetic deceleration fails, the hydraulic braking device 15 is used for hydraulic braking of the sliding plate 13; if the hydraulic braking fails, the slide plate 13 collides with the emergency speed reducing device 16 to perform emergency braking, and then the slide plate 13 is reset.
The aircraft landing gear running obstacle crossing impact test method comprises the steps of simulating the aircraft mass to be 10920kg, simulating the aircraft running speed to be 333km/h, simulating the buffer strut air pressure of the landing gear 4 to be 3MPa, measuring the maximum heading load 60.48kN, the maximum vertical load 183.09kN, and enabling the gravity center of the hanging basket 23 to shift 404.64mm, wherein the buffer strut travel is 320.24mm.
Example 3: as shown in fig. 7, the difference between the present embodiment and embodiment 1 is that the inner gear ring 37 is in a 90 ° rotation connection with the annular groove provided on the brake box 32, two first clamping blocks 321 are fixedly connected to the side wall of the brake box 32, second clamping blocks 371 corresponding to the two first clamping blocks 321 are fixedly connected to the inner gear ring 37, and an arc-shaped air bag 322 is provided between the two first clamping blocks 321 and the corresponding second clamping blocks 371, and the arc-shaped air bag 322 is fixedly connected to the corresponding first clamping blocks 321;
as shown in fig. 8, a connection plate 232 is respectively provided on the hanging basket 23 on both sides of each pulley 231, two ends of the rotation shaft of each pulley 231 are respectively connected with the corresponding connection plate 232 in a rotating way, the pulleys 231 are connected with the rotation shafts in a sliding way, an air pressure rod 234 which drives the pulleys 231 to slide on the rotation shafts by inflation is provided on the left connection plate 232, the air pressure rod 234 adopts the prior art product, a spring is sleeved on the rotation shaft between the right connection plate 232 and the pulleys 231, and the air pressure rods 234 of the two pulleys 231 on the right side of the hanging basket 23 are respectively communicated with the two arc-shaped air bags 322 of the right self-locking mechanism 3 in a one-to-one correspondence way through a conduit;
as shown in fig. 9, four bosses for sliding fit with the pulleys 231 to decelerate the basket 23 are provided on the right side in the guide rail.
The working principle of the test assembly is as follows: when the flywheel 36 is meshed with the inner gear ring 37, the flywheel 36 drives the inner gear ring 37 to rotate until the inner gear ring 37 cannot rotate after being limited, and at the moment, the flywheel 36 is blocked by the inner gear ring 37;
when the inner gear ring 37 rotates, the second clamping block 371 rotates along with the inner gear ring 37 and extrudes the arc-shaped air bag 322, the air inside the arc-shaped air bag 322 enters the air pressure rod 234 after being compressed, the air pressure rod 234 is inflated and stretched to push the pulley 231 to slide transversely, the pulley 231 enters the right side of the guide rail, the boss can prevent the pulley 231 from sliding downwards continuously, and the hanging basket 23 is prevented from falling continuously.
Example 4: the difference between this embodiment and embodiment 2 is that the aircraft landing gear running obstacle surmounting impact test method simulates an aircraft mass of 10920kg, an aircraft running speed of 333km/h, a buffer strut air pressure of 2.7MPa for landing gear 4, a maximum heading load of 54.69kN, a maximum vertical load of 173.30kN, a centre of gravity displacement of the basket 23 of 408.99mm, and a buffer strut stroke of 331.72mm.
Example 5: the difference between this embodiment and embodiment 2 is that the aircraft landing gear running obstacle surmounting impact test method simulates an aircraft mass of 11800kg, an aircraft running speed of 333km/h, a buffer strut air pressure of 3MPa for landing gear 4, a maximum heading load 57.53kN, a maximum vertical load 170.05kN, a centre of gravity displacement 399.41mm for basket 23, and a buffer strut travel 332.09mm.
Example 6: the difference between this embodiment and embodiment 2 is that the aircraft landing gear running obstacle surmounting impact test method simulates an aircraft mass of 11800kg, an aircraft running speed of 346km/h, a buffer strut air pressure of 3MPa for landing gear 4, a maximum heading load of 47.81kN, a maximum vertical load of 188.17kN, a gravity center displacement of 431.92mm for basket 23, and a buffer strut stroke of 334.99mm.
Claims (7)
1. The landing gear running obstacle crossing impact test device based on electromagnetic ejection is characterized by comprising a test track (1) paved on the ground, a test bench (2) arranged on the test track (1), a landing gear (4) hung on the test bench (2) and an anti-falling device arranged on the test bench (2);
a sliding plate (13) which is in sliding connection with the test track (1) is arranged on the test track (1), a linear motor is arranged on the test track (1), the sliding plate (13) is fixedly connected with a rotor of the linear motor, and a barrier boss (14) is arranged on the sliding plate (13); the test track (1) is divided into an electromagnetic acceleration track (11) and an electromagnetic deceleration track (12) along the movement direction of the sliding plate (13);
a hydraulic braking device (15) and an emergency speed reducing device (16) for reducing the speed of the sliding plate (13) are sequentially and fixedly arranged on the electromagnetic speed reducing rail (12) along the movement direction of the sliding plate (13);
a hanging basket (23) which is in sliding connection with the test bed (2) is arranged in the test bed (2), the upper end of the hanging basket (23) is connected with lifting equipment through a rope, the landing gear (4) is fixedly connected with a mounting rack (24) arranged on the bottom surface of the hanging basket (23), and the test bed (2) is provided with data acquisition equipment for acquiring landing gear (4) sliding obstacle crossing data;
the anti-falling device comprises a bearing plate (25) arranged on a hanging basket (23) and used for placing a balancing weight, a fixed pulley (34) fixedly arranged on a test bench (2), a connecting rope (311) with one end fixedly connected with the bearing plate (25), and a self-locking mechanism (3) arranged on the hanging basket (23) and used for locking the connecting rope (311), wherein the other end of the connecting rope (311) bypasses the fixed pulley (34) and is connected with the self-locking mechanism (3);
the test bench (2) comprises upright posts (21) fixedly connected with the test track (1) and connecting frames (22) arranged at the upper ends of the upright posts (21), four upright posts (21) are arranged, guide rails are arranged on the side walls of the four upright posts (21), and pulleys (231) which are in one-to-one corresponding sliding connection with the four guide rails are arranged on the hanging basket (23);
the bearing plate (25) is in sliding connection with a sliding column (233) arranged on the hanging basket (23), the fixed pulleys (34) are fixedly connected with the connecting frame (22), two self-locking mechanisms (3) are arranged, the two self-locking mechanisms (3) are respectively arranged on two sides of the hanging basket (23), and the connecting ropes (311) and the fixed pulleys (34) are respectively provided with two and correspond to the self-locking mechanisms (3) one by one;
the self-locking mechanism (3) comprises a spool (31) transversely arranged above the hanging basket (23), a brake box (32) and a spring box (33) which are fixedly arranged on the hanging basket (23), one end of the spool (31) passes through the brake box (32) and is rotationally connected with the brake box, the other end of the spool (31) passes through the spring box (33) and is rotationally connected with the spring box, and the other end of the connecting cable (311) is fixedly wound on the spool (31);
an inner gear ring (37) is arranged in the brake box (32), a rotating rod (35) is arranged at one end of the spool (31), an inertia wheel (36) is sleeved on the rotating rod (35), an adjusting hole for adjusting the inertia wheel (36) to deflect by utilizing the rotation of the rotating rod (35) is formed in the inertia wheel (36), a clamping groove (361) which is rotationally clamped with one end of the rotating rod (35) and an arc-shaped groove (362) which is in swinging clamping with the other end of the rotating rod (35) are formed in the adjusting hole, and teeth which are meshed with the inner gear ring (37) by utilizing the deflection of the inertia wheel (36) are formed in the side wall of the inertia wheel (36); a spiral spring is sleeved on a spool (31) positioned in the spring box (33).
2. The landing gear running over obstacle impact test device based on electromagnetic ejection according to claim 1, wherein the emergency speed reduction device (16) comprises a braking blocking platform (161) fixedly connected with the test track (1) and a blocking net (162) which is vertical to the ground and fixedly connected with the ground, and the braking blocking platform (161) is fixedly connected with the blocking net (162) through elastic ropes.
3. The landing gear running obstacle crossing impact test device based on electromagnetic ejection according to claim 1, wherein the obstacle boss (14) is detachably connected with the sliding plate (13).
4. The landing gear running over obstacle impact test unit for aircraft based on electromagnetic ejection according to claim 1, characterized in that the mounting frame (24) is connected to the landing gear (4) by means of a clamp.
5. The landing gear running obstacle crossing impact test device based on electromagnetic ejection according to claim 1, wherein the bearing plate (25) is provided with a mounting groove for placing a balancing weight.
6. The landing gear running obstacle crossing impact test device based on electromagnetic ejection according to claim 1, wherein the inner gear ring (37) is in limit rotation connection with the brake box (32), two first clamping blocks (321) are fixedly connected to the side wall of the brake box (32), second clamping blocks (371) which are in one-to-one correspondence with the two first clamping blocks (321) are fixedly connected to the inner gear ring (37), arc-shaped air bags (322) are respectively arranged between the two first clamping blocks (321) and the corresponding second clamping blocks (371), and the arc-shaped air bags (322) are fixedly connected with the corresponding first clamping blocks (321);
the hanging baskets (23) on two sides of each pulley (231) are respectively provided with a connecting plate (232), two ends of a rotating shaft of each pulley (231) are respectively connected with the corresponding connecting plates (232) in a rotating mode, the pulleys (231) are connected with the rotating shafts in a sliding mode, one connecting plate (232) is provided with an air pressure rod (234) which pushes the pulleys (231) to slide on the rotating shafts through inflation, a spring is sleeved on the rotating shaft between the other connecting plate (232) and the pulleys (231), and the air pressure rods (234) of the two pulleys (231) on the same side with the self-locking mechanism (3) are respectively communicated with two arc-shaped air bags (322) of the self-locking mechanism (3) in a one-to-one correspondence mode through a guide pipe;
one side in the guide rail is provided with a plurality of bosses which are used for reducing the speed of the hanging basket (23) in sliding fit with the pulley (231).
7. The electromagnetic ejection-based aircraft landing gear running obstacle crossing impact test method is based on the electromagnetic ejection-based aircraft landing gear running obstacle crossing impact test device according to any one of claims 1-6, and is characterized by comprising the following steps:
s1, preparing: the weight of the balancing weight in the hanging basket (23) is adjusted, the hanging basket (23) is driven to ascend through lifting equipment, so that the height of the landing gear (4) is adjusted, and the landing gear (4) is fully contacted with the sliding plate (13);
s2, performing impact test: starting the linear motor, and enabling a rotor of the linear motor to drive a sliding plate (13) to accelerate on an electromagnetic acceleration track (11) until a barrier boss (14) passes through a test bed (2), and measuring and recording loading and movement conditions of a landing gear (4) through data acquisition equipment;
s3, resetting the sliding plate (13): after the test is finished, the mover of the linear motor drives the sliding plate (13) to start electromagnetic deceleration on the electromagnetic deceleration track (12); if the electromagnetic speed reduction fails, the hydraulic braking device (15) is used for hydraulic braking of the sliding plate (13); if the hydraulic braking fails, the sliding plate (13) can collide with the emergency speed reducing device (16) to carry out emergency braking, and then the sliding plate (13) is reset.
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| CN117163318A (en) | 2023-12-05 |
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