Single-servo-channel multi-cavity hydraulic loading control system and method

Abstract

The invention belongs to the technical field of aviation structure strength tests, and discloses a single-servo-channel multi-cavity hydraulic loading control system and method. The system is composed of a Flextest200 controller, a hydraulic oil source, a mechanical protection module with a servo valve and two three-position four-way valves. The lock comprises a lock cylinder, an unlocking cylinder, a put-down actuating cylinder and a put-up actuating cylinder. The problems that an existing hydraulic loading control system is a multi-channel loading system and depends on a plurality of servo valves to independently control hydraulic branches, coordination control depends on complex program logic, and the system maintenance difficulty is large are solved.

Description

Technical Field

[0001] This invention belongs to the field of aerospace structural strength testing technology, and particularly relates to a single servo channel multi-cavity hydraulic loading control system and method. It is a multi-cavity hydraulic loading control technology that achieves coordinated control of multiple hydraulic actuators through a single servo control channel. Background Technology

[0002] In the strength design and life assessment of aircraft landing gear systems, it is usually necessary to simulate the loading conditions during the retraction and extension process. Traditionally, independent servo control channels are configured at multiple locations such as the retraction actuator, extension actuator, and unlocking actuator to achieve multi-point hydraulic loading. While this method can meet the requirements for synchronous control under multiple operating conditions, it suffers from problems such as complex system configuration, a large number of servo valves and controllers, high cost, and significant control signal interference.

[0003] Currently, the mainstream hydraulic loading control system in the industry is a multi-channel loading system, which relies on multiple servo valves to independently control the hydraulic branches. Its coordinated control depends on complex program logic, and the system is difficult to maintain. This structure increases the size, cost, and reliability risks of the loading system in large and complex systems. Therefore, there is an urgent need for a multi-cavity loading control technology with a simple system structure, strong coordinated control capabilities, and low cost to improve test efficiency and system reliability, and meet the requirements of modern aircraft for composite loading tests. Summary of the Invention

[0004] The technical problem solved by this invention is that the existing hydraulic loading control system is a multi-channel loading system that relies on multiple servo valves to independently control the hydraulic branches. Its coordinated control depends on complex program logic, and the system is difficult to maintain.

[0005] The technical solution of this invention: In a first aspect, the present invention provides a single servo channel multi-cavity hydraulic loading control system, the system comprising a Flextest200 controller 1, a hydraulic oil source 2, a mechanical protection module 3 with a servo valve 3, two three-position four-way valves 4; an unlocking cylinder 5, a lowering actuator cylinder 6, and an uppering actuator cylinder 7; The control signal output terminal of the Flextest200 controller 1 is connected to the control signal input terminal of the mechanical protection module 3 with servo valve, and the I / O signal output terminal of the Flextest200 controller 1 is connected to the signal input terminals of the two three-position four-way valves 4 respectively. The output oil circuit of the hydraulic oil source 2 is connected to the input oil circuit of the mechanical protection module 3 with servo valve, and the output oil circuit of the mechanical protection module 3 with servo valve is connected to the input oil circuit of the two three-position four-way valves 4 respectively. The two three-position four-way valves are respectively designated as three-position four-way valve one and three-position four-way valve two; One output oil circuit of the three-position four-way valve is connected to the A chamber of the unlocking cylinder 5 and the lowering actuator cylinder 6 respectively, and the other output oil circuit of the three-position four-way valve is connected to the B chamber of the lowering actuator cylinder 6. The output oil circuit of the three-position four-way valve 2 is connected to chambers A and B of the upper actuator 7, respectively.

[0006] Furthermore, the system also includes: a pressure sensor 8; The pressure sensor 8 is arranged on the output oil line of the mechanical protection module 3 with servo valve, and the signal output terminal of the pressure sensor 8 is connected to the pressure signal input terminal of the Flextest200 controller 1. The pressure sensor 8 is used to detect the hydraulic oil pressure in the oil circuit and feeds back the hydraulic oil pressure signal to the Flextest200 controller 1.

[0007] Furthermore, the system also includes: a first pressure sensor disposed between the three-position four-way valve 1 and the unlocking cylinder 5; a second pressure sensor disposed between the three-position four-way valve 1 and the A chamber of the lowering actuator cylinder 6; a third pressure sensor disposed between the three-position four-way valve 1 and the B chamber of the lowering actuator cylinder 6; a fourth pressure sensor disposed between the three-position four-way valve 2 and the A chamber of the retracting actuator cylinder 7; and a fifth pressure sensor disposed between the three-position four-way valve 2 and the B chamber of the retracting actuator cylinder 7. Each pressure sensor is used to monitor the hydraulic oil pressure on the corresponding pipeline.

[0008] Furthermore, the system also includes: a first return oil line disposed between the three-position four-way valve 1 and the hydraulic oil pump 2, and a second return oil line disposed between the three-position four-way valve 2 and the hydraulic oil pump 2.

[0009] Secondly, the present invention also provides a single-servo-channel multi-cavity hydraulic loading control method, the method being applied to the aforementioned system, the method comprising: Step 1: The Flextest200 controller 1 sends an I / O signal and a pressure control signal when loading; the pressure control signal is used to control the opening of the servo valve in the mechanical protection module 3 with the servo valve, so that the hydraulic oil source 2 outputs hydraulic oil at the corresponding pressure; Step 2: When the two three-position four-way valves 4 receive the I / O signal during loading, the oil circuit of the target actuator is opened; Step 3: After receiving the pressure control signal during loading, the mechanical protection module 3 with servo valve adjusts the oil circuit pressure to perform loading; Step 4: The FlexTest200 controller 1 receives the feedback signal from the pressure sensor 8 and performs closed-loop control; Step 5: Flextest200 controller 1 sends out pressure control signals and I / O signals during unloading; Step 6: After receiving the pressure control signal during unloading, the mechanical protection module 3 with servo valve adjusts the oil circuit pressure to unload; Step 7: The FlexTest200 controller 1 receives the feedback signal from the pressure sensor 8 and performs closed-loop control; Step 8: When the two three-position four-way valves 4 receive the I / O signal during unloading, the oil circuit of the target actuator cylinder is disconnected.

[0010] Furthermore, the I / O signals output by the Flextest200 controller 1 are used to control the opening and closing of the three-position four-way valve 1 and the three-position four-way valve 2. There are a total of four I / O signals, two of which are input to the three-position four-way valve 1 and the other two are input to the three-position four-way valve 2.

[0011] Furthermore, the process of loading and unloading hydraulic oil is as follows: The input I / O signal to the three-position four-way valve one causes the three-position four-way valve one to open the A chamber of the unlocking cylinder and the lowering actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the A chamber of the unlocking cylinder and the lowering actuator cylinder to rise from zero to the preset first pressure, and then drop from the preset first pressure back to zero. The input I / O signal to the three-position four-way valve one causes the three-position four-way valve one to open the B chamber of the lowering actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the B chamber of the lowering actuator cylinder to rise from zero to the preset second pressure, and then drop from the preset second pressure back to zero.

[0012] Furthermore, the process of loading and unloading hydraulic oil is as follows: The input I / O signal to the three-position four-way valve two causes the three-position four-way valve two to open the A chamber of the upper actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the A chamber of the upper actuator cylinder to rise from zero to the preset first pressure, and then drop from the preset first pressure back to zero. The input I / O signal to the three-position four-way valve II causes the three-position four-way valve II to open the B chamber of the upper actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the B chamber of the upper actuator cylinder to rise from zero to the preset second pressure, and then drop from the preset second pressure back to zero.

[0013] The advantages of this invention are: 1) Simplified system and cost-saving: Only one servo channel is needed to control multiple actuators, which significantly simplifies the system structure and reduces the hardware investment and subsequent maintenance costs of the control system; 2) Improved loading efficiency and corresponding flexibility: The loading steps respond quickly, with higher time efficiency, and the pressure of each hydraulic chamber supports rapid switching, which can flexibly cope with complex and ever-changing loading conditions. 3) Wide range of applications and strong versatility: It can be widely used in aerospace test centers, military / civilian aircraft manufacturing units, scientific research universities and other fields to meet the needs of different types of landing gear structure retraction and loading tests and teaching research. 4) Supports modular integration and facilitates system expansion: As an important component of the modular hydraulic testing system, it facilitates system integration and expansion by equipment suppliers; 5) Promote localization and enhance independent controllability: Responding to the strong domestic demand for low-cost, high-performance loading systems, it helps to break through foreign technical barriers and improve the independent design and manufacturing level of my country's ground hydraulic loading systems; 6) It has significant economic and strategic value: It is expected to be industrialized and bring good economic benefits. It has long-term development prospects and strategic significance in the fields of aviation strength testing and ground simulation testing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a single-servo-channel multi-cavity hydraulic loading control system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the loading point for the retraction and extension load of an aircraft's nose landing gear, provided in an embodiment of the present invention. Figure 3 This is a typical take-off and landing load-time curve provided in an embodiment of the present invention; In the diagram: 1—Flextest200 controller; 2—Hydraulic oil source; 3—Mechanical protection module with servo valve; 4—Three-position four-way valve; 5—Unlock cylinder; 6—Lowering actuator cylinder; 7—Retracting actuator cylinder; 8—Pressure sensor. Detailed Implementation

[0015] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] This invention provides a single-servo-channel multi-cavity hydraulic loading control system, such as... Figure 1 As shown, the system consists of a Flextest200 controller 1, a hydraulic oil source 2, a mechanical protection module with a servo valve 3, two three-position four-way valves 4, an unlocking cylinder 5, a lowering actuator cylinder 6, and an uppering actuator cylinder 7. The control signal output terminal of the Flextest200 controller 1 is connected to the control signal input terminal of the mechanical protection module 3 with servo valve, and the I / O signal output terminal of the Flextest200 controller 1 is connected to the signal input terminals of the two three-position four-way valves 4 respectively. The output oil circuit of the hydraulic oil source 2 is connected to the input oil circuit of the mechanical protection module 3 with servo valve, and the output oil circuit of the mechanical protection module 3 with servo valve is connected to the input oil circuit of the two three-position four-way valves 4 respectively. The two three-position four-way valves are respectively designated as three-position four-way valve one and three-position four-way valve two; One output oil circuit of the three-position four-way valve is connected to the A chamber of the unlocking cylinder 5 and the lowering actuator cylinder 6 respectively, and the other output oil circuit of the three-position four-way valve is connected to the B chamber of the lowering actuator cylinder 6. The output oil circuit of the three-position four-way valve 2 is connected to chambers A and B of the upper actuator 7, respectively.

[0017] The system also includes: a pressure sensor 8; The pressure sensor 8 is arranged on the output oil line of the mechanical protection module 3 with servo valve, and the signal output terminal of the pressure sensor 8 is connected to the pressure signal input terminal of the Flextest200 controller 1. The pressure sensor 8 is used to detect the hydraulic oil pressure in the oil circuit and feeds back the hydraulic oil pressure signal to the Flextest200 controller 1.

[0018] The system further includes: a first pressure sensor disposed between the three-position four-way valve 1 and the unlocking cylinder 5; a second pressure sensor disposed between the three-position four-way valve 1 and the A chamber of the lowering actuator cylinder 6; a third pressure sensor disposed between the three-position four-way valve 1 and the B chamber of the lowering actuator cylinder 6; a fourth pressure sensor disposed between the three-position four-way valve 2 and the A chamber of the retracting actuator cylinder 7; and a fifth pressure sensor disposed between the three-position four-way valve 2 and the B chamber of the retracting actuator cylinder 7. Each pressure sensor is used to monitor the hydraulic oil pressure on the corresponding pipeline.

[0019] The system also includes: a first return oil line between the three-position four-way valve 1 and the hydraulic oil pump 2, and a second return oil line between the three-position four-way valve 2 and the hydraulic oil pump 2.

[0020] The FlexTest200 controller 1 outputs pressure control signals and I / O signals, and the hydraulic oil source 2 outputs hydraulic oil. During loading, the FlexTest200 controller 1 outputs an I / O high signal to control the three-position four-way valve 4 corresponding to any one of the three actuators: the unlocking cylinder 5, the lowering actuator 6, and the retracting actuator 7. The FlexTest200 controller 1 outputs a pressure control signal to control the mechanical protection module 3 with a servo valve to adjust the oil circuit pressure for loading, and at the same time receives the feedback signal from the pressure sensor 8 to achieve closed-loop coordinated control. During unloading, the FlexTest200 controller 1 outputs a pressure control signal to control the mechanical protection module 3 with a servo valve to adjust the oil circuit pressure for unloading, and at the same time receives the feedback signal from the pressure sensor 8 to achieve closed-loop coordinated control. After unloading is completed, the FlexTest200 controller 1 outputs an I / O low signal to control the three-position four-way valve 4 corresponding to any one of the three actuators: the unlocking cylinder 5, the lowering actuator 6, and the retracting actuator 7 to disconnect.

[0021] The technical solution of this invention has been successfully applied during the application of retraction and extension loads in a fatigue test of the nose landing gear of an aircraft. Taking one typical retraction and extension load as an example... Figure 2 The test loading points are according to Figure 1 The control principle is loaded, and the loading steps are as follows: Step 1: Flextest200 controller 1 sends I / O signals and pressure control signals.

[0022] Step 2: The three-position four-way valve 4 receives the I / O signal and opens the oil circuit of the target actuator.

[0023] Step 3: After receiving the pressure control signal, the mechanical protection module 3 with servo valve adjusts the oil circuit pressure to apply load.

[0024] Step 4: The FlexTest200 controller 1 receives the feedback signal from the pressure sensor 8 and performs closed-loop control.

[0025] Step 5: Flextest200 controller 1 sends pressure control signals and I / O signals.

[0026] Step 6: After receiving the pressure control signal, the mechanical protection module 3 with servo valve adjusts the oil circuit pressure to unload the load.

[0027] Step 7: The FlexTest200 controller 1 receives the feedback signal from the pressure sensor 8 and performs closed-loop control.

[0028] Step 8: The three-position four-way valve 4 receives an I / O signal and disconnects the oil circuit of the target actuator.

[0029] Figure 3 Table 1 shows the loading error of the take-off and landing load for a typical take-off and landing operation.

[0030]

[0031] Specifically, the Flextest200 controller outputs a control signal to the mechanical protection module with a servo valve. The control signal is used to control the opening degree of the servo valve in the mechanical protection module with a servo valve, so that the hydraulic oil source outputs hydraulic oil at the corresponding pressure. The controller outputs I / O signals to control the opening and closing of the first three-position four-way valve and the second three-position four-way valve. There are a total of four I / O signals, two of which are input to the first three-position four-way valve and the other two are input to the second three-position four-way valve. When the I / O signal input to the first three-position four-way valve causes the first three-position four-way valve to open the A chamber of the unlocking cylinder and the lowering actuator cylinder, and combined with the control signal, the hydraulic oil pressure in the A chamber of the unlocking cylinder and the lowering actuator cylinder rises from zero to the preset first pressure, and then drops from the preset first pressure back to zero. When the I / O signal input to the first three-position four-way valve causes the first three-position four-way valve to open the B chamber of the lowering actuator, and combined with the control signal, the hydraulic oil pressure in the B chamber of the lowering actuator rises from zero to the preset second pressure, and then drops from the preset second pressure back to zero. When the I / O signal input to the second three-position four-way valve causes the second three-position four-way valve to open the A chamber of the retracting actuator, and combined with the control signal, the hydraulic oil pressure in the A chamber of the retracting actuator rises from zero to the preset first pressure, and then drops from the preset first pressure back to zero. When the I / O signal input to the second three-position four-way valve causes the second three-position four-way valve to open the B chamber of the upper actuator, and combined with the control signal, the hydraulic oil pressure in the B chamber of the upper actuator rises from zero to the preset second pressure, and then drops from the preset second pressure back to zero.

[0032] The advantages of this invention are: 1) Simplified system and cost-saving: Only one servo channel is needed to control multiple actuators, which significantly simplifies the system structure and reduces the hardware investment and subsequent maintenance costs of the control system; 2) Improved loading efficiency and corresponding flexibility: The loading steps respond quickly, with higher time efficiency, and the pressure of each hydraulic chamber supports rapid switching, which can flexibly cope with complex and ever-changing loading conditions. 3) Wide range of applications and strong versatility: It can be widely used in aerospace test centers, military / civilian aircraft manufacturing units, scientific research universities and other fields to meet the needs of different types of landing gear structure retraction and loading tests and teaching research. 4) Supports modular integration and facilitates system expansion: As an important component of the modular hydraulic testing system, it facilitates system integration and expansion by equipment suppliers; 5) Promote localization and enhance independent controllability: Responding to the strong domestic demand for low-cost, high-performance loading systems, it helps to break through foreign technical barriers and improve the independent design and manufacturing level of my country's ground hydraulic loading systems; 6) It has significant economic and strategic value: It is expected to be industrialized and bring good economic benefits. It has long-term development prospects and strategic significance in the fields of aviation strength testing and ground simulation testing.

Claims

1. A single-servo-channel multi-cavity hydraulic loading control system, characterized in that, The system consists of a Flextest200 controller (1), a hydraulic oil source (2), a mechanical protection module with a servo valve (3), two three-position four-way valves (4), an unlocking cylinder (5), a lowering actuator (6), and an uppering actuator (7); The control signal output terminal of the Flextest200 controller (1) is connected to the control signal input terminal of the mechanical protection module (3) with servo valve, and the I / O signal output terminal of the Flextest200 controller (1) is connected to the signal input terminals of the two three-position four-way valves (4) respectively. The output oil circuit of the hydraulic oil source (2) is connected to the input oil circuit of the mechanical protection module (3) with servo valve, and the output oil circuit of the mechanical protection module (3) with servo valve is connected to the input oil circuit of the two three-position four-way valves (4). The two three-position four-way valves are respectively designated as three-position four-way valve one and three-position four-way valve two; One output oil circuit of the three-position four-way valve is connected to the A chamber of the unlocking cylinder (5) and the lowering actuator cylinder (6), respectively, and the other output oil circuit of the three-position four-way valve is connected to the B chamber of the lowering actuator cylinder (6). The output oil circuit of the three-position four-way valve 2 is connected to the A chamber and B chamber of the upper actuator (7) respectively.

2. The single-servo channel multi-cavity hydraulic loading control system according to claim 1, characterized in that, The system also includes: a pressure sensor (8); The pressure sensor (8) is arranged on the output oil line of the mechanical protection module (3) with servo valve, and the signal output terminal of the pressure sensor (8) is connected to the pressure signal input terminal of the Flextest200 controller (1). The pressure sensor (8) is used to detect the hydraulic oil pressure in the oil circuit and feeds back the hydraulic oil pressure signal to the Flextest200 controller (1).

3. The single-servo channel multi-cavity hydraulic loading control system according to claim 1, characterized in that, The system further includes: a first pressure sensor disposed between the three-position four-way valve one and the unlocking cylinder (5); a second pressure sensor disposed between the three-position four-way valve one and the A chamber of the lowering actuator cylinder (6); a third pressure sensor disposed between the three-position four-way valve one and the B chamber of the lowering actuator cylinder (6); a fourth pressure sensor disposed between the three-position four-way valve two and the A chamber of the retracting actuator cylinder (7); and a fifth pressure sensor disposed between the three-position four-way valve two and the B chamber of the retracting actuator cylinder (7). Each pressure sensor is used to monitor the hydraulic oil pressure on the corresponding pipeline.

4. The single-servo channel multi-cavity hydraulic loading control system according to claim 1, characterized in that, The system also includes: a first return oil line between the three-position four-way valve and the hydraulic oil pump (2) and a second return oil line between the three-position four-way valve and the hydraulic oil pump (2).

5. A single-servo-channel multi-cavity hydraulic loading control method, characterized in that, The method is applied to the system as described in any one of claims 1-4, and the method comprises: Step 1: The Flextest200 controller (1) sends out I / O signals and pressure control signals when loading; the pressure control signal is used to control the opening of the servo valve in the mechanical protection module (3) with servo valve, so that the hydraulic oil source (2) outputs hydraulic oil at the corresponding pressure; Step 2: When the two three-position four-way valves (4) receive the I / O signal during loading, the target actuator oil circuit is opened; Step 3: The mechanical protection module (3) with servo valve receives the pressure control signal during loading and adjusts the oil circuit pressure to perform loading; Step 4: The FlexTest200 controller (1) receives the feedback signal from the pressure sensor (8) and performs closed-loop control; Step 5: The Flextest200 controller (1) sends out pressure control signals and I / O signals during unloading; Step 6: The mechanical protection module (3) with servo valve receives the pressure control signal during unloading and adjusts the oil circuit pressure to unload; Step 7: The FlexTest200 controller (1) receives the feedback signal from the pressure sensor (8) and performs closed-loop control; Step 8: The two three-position four-way valves (4) receive the I / O signal during unloading and disconnect the oil circuit of the target actuator cylinder.

6. The single-servo-channel multi-cavity hydraulic loading control method according to claim 5, characterized in that, The I / O signals output by the Flextest200 controller (1) are used to control the opening and closing of the three-position four-way valve one and the three-position four-way valve two. The I / O signals consist of four channels, two of which are input to the three-position four-way valve one and the other two are input to the three-position four-way valve two.

7. The single-servo-channel multi-cavity hydraulic loading control method according to claim 6, characterized in that, The specific process of hydraulic oil loading and unloading is as follows: The input I / O signal to the three-position four-way valve one causes the three-position four-way valve one to open the A chamber of the unlocking cylinder and the lowering actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the A chamber of the unlocking cylinder and the lowering actuator cylinder to rise from zero to the preset first pressure, and then drop from the preset first pressure back to zero. The input I / O signal to the three-position four-way valve one causes the three-position four-way valve one to open the B chamber of the lowering actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the B chamber of the lowering actuator cylinder to rise from zero to the preset second pressure, and then drop from the preset second pressure back to zero.

8. The single-servo-channel multi-cavity hydraulic loading control method according to claim 6, characterized in that, The specific process of hydraulic oil loading and unloading is as follows: The input I / O signal to the three-position four-way valve two causes the three-position four-way valve two to open the A chamber of the upper actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the A chamber of the upper actuator cylinder to rise from zero to the preset first pressure, and then drop from the preset first pressure back to zero. The input I / O signal to the three-position four-way valve II causes the three-position four-way valve II to open the B chamber of the upper actuator cylinder, and combined with the control signal, causes the hydraulic oil pressure in the B chamber of the upper actuator cylinder to rise from zero to the preset second pressure, and then drop from the preset second pressure back to zero.

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