A method for processing water rudder shaking of a seaplane

Abstract

This invention belongs to the field of amphibious aircraft technology, specifically relating to a method for handling water rudder vibration in seaplanes. It is used in water rudder control systems with multiple hydraulic locks, and the method includes the following steps: S1: Locating the location of the hydraulic lock vibration fault; S2: Analyzing and determining the cause of the hydraulic lock vibration; S3: Increasing the pressure at the hydraulic lock control end by adjusting the throttle sleeve diameter at the hydraulic lock input end, making it greater than the hydraulic lock opening pressure; S4: Conducting a verification test to verify whether the vibration fault has been eliminated. If eliminated, the process ends; if not eliminated, return to step S3. This invention uses an elimination method to locate the vibration problem to a single component and verifies the effectiveness of the modification measures through testing. The problem is accurately located, and the solution is effective. Eliminating vibration through the adjustment of external finished product parameters avoids the time cost of modifying finished equipment, especially under tight development cycles, where its advantages are particularly prominent.

Description

Technical Field

[0001] This invention belongs to the field of amphibious aircraft technology, specifically relating to a method for handling water rudder vibration in seaplanes. Background Technology

[0002] Amphibious aircraft have the ability to take off and land on both land and water. Water rudders are installed to facilitate turning while navigating on water. When the water rudder system vibrates, most solutions involve modifying the finished product, which increases time and economic costs. This invention mainly proposes a method for adjusting the parameters of peripheral finished equipment to solve the water rudder vibration problem.

[0003] The existing aircraft water rudder actuators exhibit water rudder surface vibration during extension. This is mainly due to the fact that the opening pressure of the hydraulic lock and the control end pressure of the hydraulic lock are relatively close, causing the hydraulic lock to continuously open and close, resulting in water rudder vibration. Summary of the Invention

[0004] The purpose of this invention is to provide a method for handling water rudder vibration in seaplanes by adjusting the combined hydraulic valve parameters of the seaplane's water rudder control system to eliminate the fault.

[0005] This method is implemented through the following technical solution:

[0006] To achieve the aforementioned objective, a method for handling water rudder vibration in seaplanes is proposed. The method is characterized by its application to a water rudder control system with multiple hydraulic locks, and specifically includes the following steps:

[0007] S1: Locate the location of the hydraulic lock vibration fault;

[0008] S2: Analyze and determine the cause of hydraulic lock vibration;

[0009] S3: By adjusting the throttling sleeve diameter at the input end of the hydraulic lock, the pressure at the control end of the hydraulic lock is increased to make it greater than the opening pressure of the hydraulic lock;

[0010] S4: Conduct a verification test to verify whether the jitter fault has been eliminated. If it has been eliminated, the process ends; if it has not been eliminated, return to step S3.

[0011] In one possible embodiment, the water rudder control system includes: a combination hydraulic valve (1), a return hydraulic lock (2), a control hydraulic lock (3), and a control actuator (4).

[0012] The combined hydraulic valve (1) includes a solenoid valve (101), an extension valve (102), a retraction valve (103), and a function switching valve (104).

[0013] The solenoid valve (101) controls the on / off state of the oil circuit of the water steering control system;

[0014] The extension valve (102) or retraction valve (103) controls the extension or retraction of the control actuator (4) to control the deflection of the water rudder surface;

[0015] The function switching valve (104) switches the control oil circuit and the return oil circuit according to the on / off state of the solenoid valve (101);

[0016] The return hydraulic lock (2) control terminal C1 is connected to the direction control oil interface I of the combined hydraulic valve. When the hydraulic source fails, the control actuator is kept in the neutral position.

[0017] The control end C1 of the hydraulic lock (3) is connected to the direction control oil interface II of the combined hydraulic valve. During normal operation, it controls the inlet / outlet oil of the actuator.

[0018] The control actuator (4) is a single-lever actuator with a return hole;

[0019] By transmitting on / off signals to the solenoid valve (101), extension valve (102) or retraction valve (103) through the control equipment, the oil passes through the solenoid valve (101) to the extension valve (102) or retraction valve (103) to control the extension or retraction of the actuator respectively, thereby controlling the deflection of the water rudder surface; the oil passes through the function switching valve (104) and the control hydraulic lock (3) to enter the operating actuator (4) chamber, and then passes through the return hydraulic lock (2) to enter the return oil.

[0020] In one possible embodiment, step S1 specifically involves locating the hydraulic lock jitter fault location through the following steps:

[0021] S101: Connect the control end C1 of the return hydraulic lock (2) to the direction control oil interface II of the combined hydraulic valve (1), and observe whether the water rudder surface shakes. If it shakes, proceed to step S102.

[0022] S102: Connect the control end of the return hydraulic lock (2) to the oil inlet Ps and observe whether the water rudder surface is shaking. If it is shaking, proceed to step S103.

[0023] S103: The actuator (4) is directly connected to the return oil interface Ⅲ of the combined hydraulic valve (1), and the oil interfaces A2 and C2 of the return hydraulic lock (2) are blocked. Observe whether the water rudder surface shakes. If it shakes, proceed to step S104.

[0024] S104: Remove the return hydraulic lock (2), and connect the return oil interface Ⅲ of the actuator (4) directly to the return oil interface Ⅲ of the combined hydraulic valve (1) to observe whether the water rudder surface shakes.

[0025] S105: The final fault location was that the opening pressure of the return hydraulic lock (2) and the control terminal C1 pressure of the return hydraulic lock (2) were mismatched, causing the water rudder system to vibrate. The vibration was more severe when the control actuator (4) was working at a lower speed. At the same time, the possibility of a fault in the control hydraulic lock (3) was ruled out.

[0026] In one possible embodiment, in step S2, the cause of hydraulic lock vibration is determined by analysis to be that the opening pressure pa of the hydraulic lock is close to the pressure at the control end C1 of the return hydraulic lock (2), and the vibration is more severe when the actuator (4) is operating at a lower speed.

[0027] In one possible embodiment, step S3 specifically includes the following steps:

[0028] S301: Test the pressure p1 of the directional control oil interface I of the combined hydraulic valve (1) and the output speed V of the actuator (4), and calculate the pressure difference Δp between the pressure p1 of the directional control oil interface I of the combined hydraulic valve (1) and the opening pressure pa of the return hydraulic lock (2);

[0029] S302: When 0 < Δp ≤ 0.2, the output speed increases by 10%V.

[0030] Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ7.5~φ8.5 (mm).

[0031] When 0.2 < Δp ≤ 0.5, the output speed increases by 8%V.

[0032] Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ6.5~φ7.5 (mm).

[0033] When 0.5 < Δp ≤ 0.7, the output speed increases by 5%V.

[0034] Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ5.5~φ6.5 (mm).

[0035] When 0.7 < Δp ≤ 1, the output speed increases by 3%V.

[0036] Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ4.5~φ5.5 (mm).

[0037] When Δp > 1, the output speed remains unchanged.

[0038] In one possible embodiment, step S4 specifically includes the following steps:

[0039] S401: Determine the diameter of the throttling sleeve of the combined hydraulic valve (1) II port and install the return water steering system;

[0040] S402: Conduct functional performance verification tests;

[0041] S403: Observe whether the shaking fault has been eliminated. If it has been eliminated, the process ends; if it has not been eliminated, return to step S3.

[0042] In one possible embodiment, the selected combined hydraulic valve has replaceable throttle sleeves at both the inlet and return ports, and a return oil circuit specifically designed for the return function.

[0043] In one possible embodiment, the selected hydraulic lock is a two-way hydraulic lock, where turning on one side of the control terminal will turn on the other side.

[0044] This method has the following beneficial effects:

[0045] By using the process of elimination, the vibration problem was pinpointed to a single component, and the effectiveness of the changes was verified through testing. The problem was accurately located, and the solution was effective.

[0046] By adjusting the external finished product parameters, the vibration is eliminated, avoiding the time cost of changing the finished product equipment. This is especially advantageous when the development cycle is tight.

[0047] By adjusting the external finished product parameters, jitter is eliminated, avoiding the R&D design risks brought about by changes to the finished product. This is mainly reflected in the uncertainty brought about by changes to the finished product, especially in terms of functional compliance.

[0048] The vibration can be eliminated by adjusting the external finished product parameters. The solution is simple and easy to operate. In addition, the combined hydraulic lock throttle sleeve is an adjustable component, and the replacement cost is low. Attached Figure Description

[0049] Figure 1 , Figure 2 This is a flowchart of the method of the present invention;

[0050] Figure 3 This is an example diagram illustrating the hydraulic principle of a waterwheel control system;

[0051] The components include: 1 combined hydraulic valve, 2 return hydraulic lock, 3 control hydraulic lock, and 4 operating actuator.

[0052] Combined hydraulic valve (1) wherein: 101 solenoid valve, 102 extension valve, 103 retraction valve, 104 function switching valve; Detailed Implementation

[0053] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0054] A method for handling water rudder vibration in seaplanes, using a water rudder control system of a certain aircraft model as an example. Figure 3 The specific components are as follows: solenoid valve (101), extension valve (102), retraction valve (103), function switching valve (104), return hydraulic lock (2), control hydraulic lock (3), and operating actuator (4).

[0055] The control device sends on / off signals to the solenoid valve (101), the extension valve (102), and the retraction valve (103);

[0056] The oil flows through the solenoid valve (101) to the extension valve (102) or retraction valve (103) to control the extension or retraction of the actuator, thereby controlling the deflection of the water rudder surface.

[0057] The oil enters the control actuator (4) chamber through the function switching valve (104) and the control hydraulic lock (3), and then enters the return oil through the return hydraulic lock (2);

[0058] During the extension of the actuator (4), the rudder surface vibrates. The following test plan is specified to eliminate the cause of the fault:

[0059] 1) The return hydraulic lock (2) is connected to port II. The water rudder system is operated at different speeds. Pressure vibration and abnormal noise are observed.

[0060] 2) The return hydraulic lock (2) is connected to the oil inlet Ps. The water rudder system is operated at different speeds, and no pressure vibration or abnormal noise is observed.

[0061] 3) The actuator Ⅲ is directly connected to the combination valve Ⅲ. The return hydraulic lock (2) A2 and C2 are blocked. The water rudder system is operated at different speeds. Pressure vibration and abnormal noise are observed.

[0062] 4) Remove the return hydraulic lock (2), and connect the actuator III directly to the combination valve III. Operate the water rudder system at different speeds and observe no pressure vibration or abnormal noise.

[0063] Based on the above test results, it is determined that the vibration is caused by the opening pressure of the return hydraulic lock being close to the pressure of the control end C1 of the return hydraulic lock (2), and the vibration is more severe when the operating speed of the actuator (4) is low.

[0064] Based on the analysis of the test results, the proposed improvement plan is as follows: remove the throttling sleeve of port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve of port II to increase the pressure at the control end C1 of the return hydraulic lock (2) so that it is greater than the opening pressure of the hydraulic lock. The experimental verification plan is as follows:

[0065] 1) Calculate the pressure difference Δp = 0.3 MPa between the pressure p1 at interface I of the combined hydraulic valve and the opening pressure pa of the hydraulic lock;

[0066] 2) According to S302: When 0.2 < Δp ≤ 0.5, and the output speed increases by 8%V, remove the throttling sleeve of port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve of port II to φ6.5~φ7.5 (mm).

[0067] 3) Test verification of the water rudder system showed no pressure vibration and no abnormal noise.

Claims

1. A method for handling water rudder vibration in seaplanes, characterized in that, For a water rudder control system with multiple hydraulic locks, the water rudder control system includes: a combined hydraulic valve (1), a return hydraulic lock (2), a control hydraulic lock (3), and a control actuator (4); the combined hydraulic valve (1) includes a solenoid valve (101), an extension valve (102), a retraction valve (103), and a function switching valve (104); the solenoid valve (101) controls the on / off state of the water rudder control system oil circuit; the extension valve (102) or the retraction valve (103) controls the control actuator (4) to extend or retract, controlling the deflection of the water rudder surface; the function switching valve (104) switches the control oil circuit and the return oil circuit according to the on / off state of the solenoid valve (101); the control terminal C1 of the return hydraulic lock (2) is connected to the directional control oil interface I of the combined hydraulic valve, and in the event of hydraulic power failure... When the actuator is in a neutral position, the control hydraulic lock (3) is connected to the direction control oil interface II of the combined hydraulic valve. During normal operation, the actuator is controlled to enter / exit the oil. The control actuator (4) is a single-lever actuator with a return center hole. The control equipment transmits on / off signals to the solenoid valve (101), the extension valve (102) or the retraction valve (103). The oil passes through the solenoid valve (101) to the extension valve (102) or the retraction valve (103) to control the extension or retraction of the actuator, thereby controlling the deflection of the water rudder surface. The oil passes through the function switching valve (104) and the control hydraulic lock (3) into the chamber of the control actuator (4), and then passes through the return center hydraulic lock (2) into the return oil. The processing method specifically includes the following steps: S1: Locate the hydraulic lock vibration fault location; In step S1, the hydraulic lock vibration fault location is located through the following steps: S101: Connect the control end C1 of the return hydraulic lock (2) to the directional control oil interface II of the combined hydraulic valve (1), and observe whether the water rudder surface vibrates. If it vibrates, proceed to step S102; S102: Connect the control end of the return hydraulic lock (2) to the oil inlet Ps, and observe whether the water rudder surface vibrates. If it vibrates, proceed to step S103; S103: Connect the actuator (4) directly to the return oil interface III of the combined hydraulic valve (1), and the return hydraulic lock (2) If the oil inlets A2 and C2 are blocked, observe whether the water rudder surface vibrates. If it vibrates, proceed to step S104. S104: Remove the return hydraulic lock (2), and connect the return oil inlet III of the actuator (4) directly to the return oil inlet III of the combined hydraulic valve (1). Observe whether the water rudder surface vibrates. S105: The final fault location is that the opening pressure of the return hydraulic lock (2) and the control end C1 pressure of the return hydraulic lock (2) are mismatched, causing the water rudder system to vibrate. The vibration is more severe when the actuator (4) is working at a lower speed. At the same time, the possibility of the control hydraulic lock (3) malfunction is ruled out. S2: Analyze and determine the cause of hydraulic lock vibration; S3: By adjusting the throttling sleeve diameter at the input end of the hydraulic lock, the pressure at the control end of the hydraulic lock is increased to make it greater than the opening pressure of the hydraulic lock; S4: Conduct a verification test to verify whether the jitter fault has been eliminated. If it has been eliminated, the process ends; if it has not been eliminated, return to step S3.

2. The method for handling water rudder vibration of a seaplane according to claim 1, characterized in that, In step S2, the analysis determined that the hydraulic lock vibration was caused by the opening pressure pa of the hydraulic lock being close to the control end C1 pressure of the return hydraulic lock (2), and the vibration was more severe when the actuator (4) was operating at a lower speed.

3. The method for handling water rudder vibration of a seaplane according to claim 2, characterized in that, Step S3 specifically includes the following steps: S301: Test the pressure p1 of the directional control oil interface I of the combined hydraulic valve (1) and the output speed V of the actuator (4), and calculate the pressure difference Δp between the pressure p1 of the directional control oil interface I of the combined hydraulic valve (1) and the opening pressure pa of the return hydraulic lock (2); S302: When 0 < Δp ≤ 0.2, the output speed increases by 10%V. Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ7.5~φ8.5mm; When 0.2 < Δp ≤ 0.5, the output speed increases by 8%V. Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ6.5~φ7.5mm; When 0.5 < Δp ≤ 0.7, the output speed increases by 5%V. Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ5.5~φ6.5mm; When 0.7 < Δp ≤ 1, the output speed increases by 3%V. Remove the throttling sleeve from port I of the combined hydraulic valve and adjust the diameter of the throttling sleeve from port II to φ4.5~φ5.5mm; When Δp > 1, the output speed remains unchanged.

4. The method for handling water rudder vibration of a seaplane according to claim 3, characterized in that, Step S4 specifically includes the following steps: S401: Determine the diameter of the throttling sleeve of the combined hydraulic valve (1) II port and install the return water steering system; S402: Conduct functional performance verification tests; S403: Observe whether the shaking fault has been eliminated. If it has been eliminated, the process is complete. If the problem is not resolved, return to step S3.

5. A method for processing water rudder vibration of a seaplane according to any one of claims 1-4, characterized in that, The selected combination hydraulic valves have replaceable throttle sleeves at the inlet and outlet ports, and a return oil circuit specifically designed for the return function.

6. A method for processing water rudder vibration of a seaplane according to any one of claims 1-4, characterized in that, The selected hydraulic lock is a two-way hydraulic lock; turning on the control end on one side will turn on the other side.

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