Course speed simulation control system for landing gear drop test

Abstract

The invention discloses an undercarriage drop test course speed simulation control system, which is characterized in that an undercarriage is mounted below a hanging basket, a force measuring platform is arranged right below the undercarriage, a power source is arranged on one side of the force measuring platform, and the power source is in transmission connection with airplane wheels of the undercarriage through a belt; the power source drives the airplane wheels to rotate so as to simulate the course landing speed of the undercarriage. Due to the fact that the power source does not need to be arranged on the hanging basket, the weight of the hanging basket system is not increased, the problem that the power source is installed on the hanging basket does not need to be considered, and the problems existing in the drop test of the small-tonnage undercarriage are well solved.

Description

Technical Field

[0001] The invention belongs to the technical field of design tests, and in particular relates to a heading speed simulation control system for a landing gear drop shock test. Background Art

[0002] The landing gear drop test simulates the impact of an aircraft landing on the ground to verify the landing cushioning performance of the aircraft's landing gear system. It is a critical step in the design of aircraft landing gear systems. During the landing gear drop test, the wheel rotation speed during landing must be simulated. Currently, the main wheel rotation methods used in landing gear drop tests include follower rotation and friction wheel rotation.

[0003] The follow-up belt rotation is achieved by installing a belt rotation mechanism at the bottom of the hanging basket. During the test, the belt rotation mechanism uses a hydraulic motor to drive the machine wheel to rotate through a belt. After reaching the predetermined speed, the belt rotation mechanism falls with the hanging basket to complete the drop shock test; the friction wheel belt rotation mainly uses a motor to drive the friction wheel to rotate, and the friction between the friction wheel and the machine wheel drives the machine wheel to rotate. After reaching the predetermined speed, the belt rotation mechanism retreats to a safe position, the hanging basket falls, and the drop shock test is completed.

[0004] When testing with friction wheel rotation, if the speed is too high, slippage may occur between the friction wheel and the aircraft wheel, making it difficult to guarantee the actual speed of the aircraft wheel. Once the friction wheel speed reaches the set value, the rotation mechanism must be retracted to a safe position before the basket can be released for free fall. During this time, the wheel speed will decrease, affecting the accuracy of the test results. Furthermore, friction wheel rotation is not suitable for multi-wheel landing gear, especially those with four or more wheels.

[0005] In addition, for the drop test of small-tonnage landing gear systems, the weight of the hanging basket is required to be light enough. If a follow-up belt rotation device is installed on the bottom plate of the hanging basket, the test launch mass will be too large and will not meet the test requirements. In addition, the hanging basket design for the small landing gear drop test is small and there is not enough space to install the follow-up belt rotation device. Summary of the Invention

[0006] The purpose of the present invention is to provide a heading speed simulation control system for a landing gear drop test, so as to solve the problems that the existing landing gear wheel belt rotation method increases the launch weight and is difficult to install when used in a small-tonnage landing gear drop test, and the friction wheel belt rotation method is not applicable to the multi-wheel landing gear drop test.

[0007] The present invention is achieved through the following technical solutions: A heading speed simulation control system for a landing gear drop shock test is characterized in that the landing gear is installed below a hanging basket, a force measuring platform is provided directly below the landing gear, a power source is provided on one side of the force measuring platform, the power source is connected to the wheels of the landing gear through a belt drive, and the wheels are driven to rotate by the power source to simulate the heading landing speed of the landing gear.

[0008] In some embodiments, when the landing gear is in an initial position, the belt is tightened and drives the wheel to rotate through the power source; during the landing gear descending process, the belt is gradually loosened so that the power source releases the transmission to the wheel.

[0009] In some embodiments, the position of the power source can be adjusted to adjust the belt tension between the power source and the wheel.

[0010] In some embodiments, the power source is a servo motor or a hydraulic motor.

[0011] In some embodiments, a driving wheel is provided on the servo motor or hydraulic motor, a driven wheel is provided on the machine wheel, the belt connects the driving wheel and the driven wheel, and the driven wheel is provided on the machine wheel hub.

[0012] In some embodiments, a control unit is included, which is used to control the wheel speed and control the power source to stop working when the cradle is released.

[0013] In some embodiments, the control unit is capable of setting and acquiring the rotational speed data of the wheel, and after the rotational speed of the wheel reaches the set value and stabilizes, the control unit controls the power source to stop working while releasing the basket.

[0014] In some embodiments, the power source is provided in plurality, each power source being connected to each wheel of the landing gear, for simultaneously driving the plurality of wheels to rotate so as to simulate the heading landing speed of the landing gear having multiple wheels.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention sets the power source for driving the rotation of the wheel on the ground where the force measuring platform is located. The power source and the wheel are connected by a belt drive. When the basket is released, the landing gear falls with the basket. During this process, the belt can be automatically loosened, realizing the simulation of the landing gear heading speed in the drop shock test.

[0016] Since the power source does not need to be installed on the hanging basket, the weight of the hanging basket system will not be increased, and there is no need to consider the installation of the power source on the hanging basket, which effectively solves the problems existing in the drop shock test of small-tonnage landing gear.

[0017] The present invention utilizes the movement of the landing gear to realize automatic switching between the tensioned and loosened states of the belt, effectively solving the problem of wheel speed loss caused by the belt rotation device retreating to a safe position when the friction wheel belt rotation method is adopted, thereby ensuring the accuracy of the test.

[0018] The system uses multiple power sources to drive multiple wheels of the landing gear respectively to simulate the heading landing speed of the multi-wheel landing gear. It can effectively solve the problem that the friction wheel belt rotation method is not applicable in the multi-wheel landing gear drop shock test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The figure is a schematic structural diagram of a heading speed simulation control system for a landing gear drop test according to an embodiment of the present invention.

[0021] Figure 2 This is a front view of the structure of the heading speed simulation control system for the landing gear drop test according to an embodiment of the present invention.

[0022] Figure 3 This is a left view of the structure of a heading speed simulation control system for a landing gear drop test according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the landing gear in the initial position according to an embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the landing gear in the lowered state according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the state when the landing gear hits the force measuring platform according to an embodiment of the present invention.

[0026] Figure 7 The figure is a schematic structural diagram of an embodiment of the present invention applied to a two-wheel landing gear.

[0027] Figure 8 The figure is a schematic structural diagram of an embodiment of the present invention applied to a four-wheel landing gear.

[0028] in: 10. Hanging basket, 11. Test fixture; 20. Landing gear, 21. Wheels; 31. Power source, 32. Driving pulley, 33. Belt, 34. Driven pulley, 35. Sliding guide rail, 36. Mounting seat; 40. Force measuring platform. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0030] In order to solve the problems of excessive basket mass caused by the follow-up belt rotation method and wheel speed loss caused by the friction belt rotation method, and to meet the requirements of wheel belt rotation in the landing gear drop shock test and ensure the accuracy of the test results, the present invention provides a landing gear drop shock test heading speed simulation control system, in which a power source is set on the ground, and the power source and the wheel are connected with a belt to realize the driving of the wheel. By automatically adjusting the belt length during the landing gear drop process, the driving state of the power source on the wheel is automatically switched in different test stages to meet the heading landing speed requirement of the landing gear drop shock test.

[0031] Reference Figure 1 In some embodiments of the present invention, referring to Figure 1 、 Figure 2 and Figure 3 The landing gear drop test heading speed simulation control system includes: A hanging basket 10 is provided with a test fixture 11, and a landing gear 20 is connected to the test fixture 11 via a landing gear shaft, and the landing gear is installed below the hanging basket; A force measuring platform 40 is provided directly below the landing gear and is used to measure the vertical load and lateral load when the landing gear freely falls onto the force measuring platform; The power source 31 is provided on one side of the force measuring platform. The power source 31 is connected to the wheel 21 of the landing gear via a belt 33 , and the wheel is driven to rotate by the power source.

[0032] When the landing gear is in the initial position, the belt is tightened and drives the wheel to rotate through the power source; during the landing gear lowering process, the belt gradually loosens and the power source releases the transmission to the wheel.

[0033] In some embodiments, the power source 31 is arranged on a mounting seat 36, a sliding guide rail 35 is arranged on one side of the force measuring platform 40, and the mounting seat 36 is arranged on the sliding guide rail 35 and is slidably connected with the sliding guide rail. When the position of the mounting seat on the sliding guide rail is changed, the transmission distance between the power source and the wheel can be adjusted, and the tension of the belt can be adjusted; at the same time, belts of different lengths can be replaced according to the test conditions to meet the needs of landing gear drop shock tests of different sizes and different postures, so that the speed simulation control system can have good versatility and applicability.

[0034] In some embodiments, the power source 31 is a servo motor or a hydraulic motor, which can meet the requirements of different wheel speeds.

[0035] A driving wheel 32 is installed on the servo motor or hydraulic motor, and a driven wheel 34 is coaxially installed on the axle of the machine wheel 21. The driving wheel 32 and the driven wheel 34 are connected by a belt 33 to realize the driving of the machine wheel by the servo motor or hydraulic motor.

[0036] The driven wheel 34 is arranged on the wheel hub and is located outside the landing gear 20. In this way, during the lowering process of the landing gear, the transmission distance between the driving wheel and the driven wheel becomes smaller, and the belt becomes loose from the driving wheel and the driven wheel. Since the driven wheel is arranged outside the landing gear, there is no other structure to constrain the belt, so the belt can be separated from the driven wheel, avoiding the influence of the belt and the rotation speed of the wheel, and preventing the belt from affecting the lowering process of the landing gear.

[0037] In some embodiments, the landing gear drop test heading speed simulation control system includes a control unit, which is capable of receiving a signal sent when the basket is released, and outputting a control instruction to the servo motor after receiving the signal to control the servo motor to stop working, so as to avoid the belt from affecting the rotation speed of the wheel and the landing gear falling process.

[0038] Of course, the control unit can also be used to control the start-up of the power source, and can set and control the wheel speed and obtain the wheel speed data.

[0039] The present invention mainly relates to the improvement of the belt rotation mechanism in the system. The hanging basket in the system and the fixing and releasing mechanism of the hanging basket and the structure adopted to enable the hanging basket to perform free fall motion in the vertical direction in the released state can all adopt the structure adopted by the existing drop shock test device.

[0040] In some embodiments, for simulating the heading speed of a multi-wheel landing gear, the system uses multiple power sources 31, which are connected to each wheel of the landing gear via a belt drive, to simultaneously drive multiple wheels to rotate to simulate the heading landing speed of a landing gear with multiple wheels. The use of multiple power sources in the system can achieve the drive of the multi-wheel landing gear, which can effectively solve the problem that the friction wheel belt rotation method is not applicable in the multi-wheel landing gear drop shock test. Figure 7 As shown, for a dual-wheel landing gear, two power sources are set in the system, and the two wheels are driven by the two power sources respectively; Figure 8As shown, for a four-wheel landing gear, the system is equipped with four power sources, each driving one of the four wheels. The system can be configured with a corresponding number of power sources based on the number of wheels, making it well suited for drop shock testing of multi-wheel landing gear.

[0041] Reference Figure 4 During the test, the landing gear is connected to the basket through the test fixture, and the position of the servo motor or hydraulic motor is adjusted to adjust the tension of the belt to control the pressure between the belt and the driving pulley and the driven pulley; Set the wheel speed on the servo motor or hydraulic motor control system, start the servo motor or hydraulic motor to drive the wheel to rotate; refer to Figure 5 and Figure 6 When the wheel reaches the set speed, the basket is released, and the basket, fixture and landing gear perform free fall. As the landing gear falls, the distance between the driving wheel and the driven wheel shortens, the belt automatically falls off, and the drive to the wheel is released. In this state, the landing gear falls onto the force measuring platform and hits the force measuring platform. The force measuring platform measures the vertical load, heading load and lateral load. After the data acquisition system completes the collection of other data, the landing gear drop shock test is completed.

[0042] When the hanging basket is released, the servo motor is controlled to stop working.

[0043] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0044] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of the present invention does not necessarily imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0045] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A landing gear drop test heading speed simulation control system, characterized in that: The landing gear is installed under the basket. A force measuring platform is provided directly below the landing gear. A power source is provided on one side of the force measuring platform. The power source is connected to the wheels of the landing gear through a belt drive. The power source drives the wheels to rotate to simulate the heading landing speed of the landing gear.

2. The landing gear drop test heading speed simulation control system according to claim 1, characterized in that: When the landing gear is in the initial position, the belt is tightened and drives the wheel to rotate through the power source; during the landing gear descending process, the belt is gradually loosened so that the power source releases the transmission to the wheel.

3. The landing gear drop test heading speed simulation control system according to claim 1, characterized in that: The position of the power source can be adjusted to adjust the belt tension between the power source and the wheel.

4. The landing gear drop test heading speed simulation control system according to claim 1, characterized in that: The power source is a servo motor or a hydraulic motor.

5. The landing gear drop test heading speed simulation control system according to claim 4, characterized in that: A driving wheel is arranged on the servo motor or the hydraulic motor, a driven wheel is arranged on the machine wheel, the belt connects the driving wheel and the driven wheel, and the driven wheel is arranged on the machine wheel hub.

6. The landing gear drop test heading speed simulation control system according to claim 1, characterized in that: The invention comprises a control unit, wherein the control unit is used for controlling the wheel speed and controlling the power source to stop working when the hanging basket is released.

7. The landing gear drop test heading speed simulation control system according to claim 6, characterized in that: The control unit can set and obtain the rotational speed data of the wheel, and after the rotational speed of the wheel reaches the set value and stabilizes, it controls the power source to stop working while releasing the hanging basket.

8. A landing gear drop test heading speed simulation control system according to any one of claims 1 to 6, characterized in that: The power sources are provided in plurality, each power source being connected to each wheel of the landing gear respectively, and being used for driving the plurality of wheels to rotate simultaneously to simulate the heading landing speed of the landing gear having the plurality of wheels.

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