A method for monitoring the health of the hydraulic system liquid level of a helicopter

Abstract

The present application belongs to the field of hydraulic system design, and relates to a kind of helicopter hydraulic system liquid level health monitoring method.Through installing oil level signal sensor on hydraulic oil tank, the residual oil quantity in current oil tank can be identified in real time, and the hydraulic oil level monitoring system is provided to identify the oil quantity signal on the hydraulic oil tank, and the oil quantity in the oil storage container such as actuator and accumulator is calculated and identified, so that the change of the oil quantity of the hydraulic system can be comprehensively known.The change of the oil quantity of the hydraulic system can be comprehensively known, and accurate oil level change can be provided for pilots in real time during flight;in terms of ground maintenance, the work of maintenance personnel on oil tank oil level monitoring can be simplified, and reliable oil level indication can be provided to reduce misjudgment or omission caused by oil level drop.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hydraulic system design, and relates to a method for monitoring the liquid level of a helicopter hydraulic system. BACKGROUND

[0002] In a hydraulic system, hydraulic oil is the working medium for transmitting power, and when the hydraulic oil is completely leaked, the hydraulic system will not be able to function normally.

[0003] 1. The normal operation of the helicopter hydraulic system is related to the flight safety of the helicopter, so the hydraulic oil level state must be monitored in the helicopter hydraulic system. The current conventional hydraulic oil level monitoring gives a fault signal only after the leakage occurs and the oil level is reduced to the alarm value, at which time there is usually only a small amount of oil in the hydraulic system, and there is only a small amount of time to deal with before the oil is completely lost and the hydraulic system completely fails.

[0004] 2. Due to the importance of the hydraulic oil level, the maintenance personnel need to regularly monitor the oil level state in the oil tank during daily maintenance, but due to the different states of the actuators and accumulators in the hydraulic system, the actual oil level in the oil tank is often inconsistent, which easily causes confusion to the maintenance personnel, resulting in misjudgment or missed judgment of the oil level drop. SUMMARY

[0005] OBJECTIVE

[0006] The helicopter hydraulic system liquid level health detection method disclosed by the present application can comprehensively know the change of the hydraulic system oil quantity, provide accurate oil level change information for the pilot in real time during flight, simplify the work of the maintenance personnel in monitoring the oil tank oil level on the ground, and provide reliable oil level indication, thereby reducing the misjudgment or missed judgment caused by the oil level drop.

[0007] TECHNICAL SCHEME

[0008] A kind of helicopter hydraulic system liquid level health monitoring method, based on liquid level health monitoring system and is realized, liquid level health monitoring system includes actuator position signal sensor 1, actuator 2, hydraulic oil tank 3, oil level signal sensor 4, accumulator 5, pressure signal sensor 6, comprehensive computer 7, display 8, detection controller 9.Position sensor 1 real-time monitoring the current displacement of piston in actuator 2, and displacement information is fed back to comprehensive computer 7;Oil level signal sensor 4 real-time detection the oil level in hydraulic oil tank 3, and the oil volume in oil tank is fed back to comprehensive computer 7;Pressure signal sensor 6 real-time detection the oil pressure in accumulator, and accumulator pressure is fed back to comprehensive computer 7;Comprehensive computer 7 is calculated based on the parameters of position signal sensor 1, oil level signal sensor 4, pressure signal sensor 6 feedback, obtains the oil volume information of hydraulic system, is displayed in real time on parameter display 8;Oil detection controller 9 is used to calibrate initial oil volume and compare current oil volume with initial oil volume.

[0009] Real-time monitoring method is as follows:

[0010] Step 1, actuator position sensor 1 feeds back the piston position of actuator 2 to comprehensive computer 7, and initial current piston position is set as L1 (set when actuator is retracted to the shortest, piston is initial position, at this time displacement is 0);

[0011] Step 2, oil level signal sensor 4 real-time detection the oil level in hydraulic oil tank 3, and oil level height information in oil tank is fed back to comprehensive computer 7, and oil surface height is set as H1;

[0012] Step 3, pressure signal sensor 6 real-time detection the oil pressure in accumulator, and accumulator pressure is fed back to comprehensive computer 7, and feedback pressure is set as P1;

[0013] Step 4, comprehensive computer 7 calculates the oil volume at this time according to piston position parameter L1, oil surface height parameter H1, accumulator pressure P1, as follows:

[0014] 4) set when actuator is extended, the cross-sectional area S of piston rod r , the area of oil inlet cavity is S1 when extending, and the area of the other cavity is S2 (assuming that the other cavity is rodless cavity);The number of actuators is n, and the maximum stroke of actuator is L0, at this time the oil volume in actuator is:

[0015] V1=(L1×S2+(L0-L1)×(S1-S r ))×n

[0016] 5) set the cross-sectional area of hydraulic oil tank as S t , and the oil surface height is 0 when the oil tank is empty, at this time the oil volume in hydraulic oil tank is:

[0017] V2=H1×S t

[0018] 6) Set the air chamber inflation pressure P g , the maximum pressure of the accumulator P max , the accumulator structure volume V s , the gas polytropic process index n g , at this time the oil volume in the accumulator is:

[0019]

[0020] Step 5, the integrated computer 7 adds the oil volume, that is, V 总 =V1+V2+V3, V3 is displayed on the parameter display 8.

[0021] Further, on this basis, when maintaining, the initial calibration of the oil level and the comparison steps are as follows:

[0022] 1. Through the calibration button 1 of the oil detection controller 9, the oil volume at that time is recorded into the integrated computer 7, defined as the initial calibration oil volume V b .

[0023] Further, 2. When maintaining comparison, press the comparison button 2, the integrated computer 7 calculates the current oil volume, which is V t , and calculates the difference value (ΔV=V t -V b ) with the initial calibration oil volume V b ; and the current oil volume V t , the initial oil volume V b , and the difference value ΔV are displayed on the display 8.

[0024] Further, before the above-mentioned step 1, it should be ensured that the helicopter is in a powered state.

[0025] Further, when calibrating the initial oil level, it should be ensured that the amount of oil in the on-board hydraulic system is within the specified normal range.

[0026] Further, when the actuator position signal sensor 1 cannot collect signals, the integrated computer 7 should transmit the fault information "actuator position signal sensor cannot collect signals" to the display 8 and display it on the display 8, at which time it is recommended to replace the actuator position signal sensor 1.

[0027] Further, when the oil level signal sensor 4 cannot collect signals, the integrated computer 7 should transmit the fault information "oil level signal sensor cannot collect signals" to the display 8 and display it on the display 8, at which time it is recommended to replace the oil level signal sensor 4.

[0028] Further, when the pressure signal sensor 6 fails to collect signals, the integrated computer 7 should transmit the fault information of "the pressure signal sensor fails to collect signals" to the display 8 and display it on the display 8, at which time it is suggested to replace the pressure signal sensor 8.

[0029] Further, the actuator should be a single-piston single-rod type with the cylinder fixed and the piston rod moving, and the cylinder should be supplied with oil.

[0030] Further, the hydraulic oil tank should be of a structure with a regular cross-sectional area of the oil storage cavity, i.e., the cross-sectional area of each height of the oil tank is equal.

[0031] Further, the pressure accumulator should be a gas pressure type.

[0032] The beneficial effects of the present application are as follows:

[0033] The helicopter hydraulic system liquid level health detection method can comprehensively know the oil quantity change of the hydraulic system, provide accurate oil level change for the pilot in real time during flight, simplify the work of the maintenance personnel on the oil tank oil level monitoring, and provide reliable oil level indication, and reduce the misjudgment or omission caused by the oil level drop. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The present application is a structural schematic diagram:

[0035] Wherein: 1-actuator position signal sensor 2-actuator 3-hydraulic oil tank 4-oil level signal sensor 5-pressure accumulator 6-pressure signal sensor

[0036] 7-integrated computer 8-display 9-oil detection controller. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in more detail below in combination with the drawings of the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0038] By installing the oil level signal sensor on the hydraulic oil tank, the remaining oil in the current oil tank can be identified in real time. The hydraulic oil level monitoring system is provided to identify the oil level signal on the hydraulic oil tank, and the oil level in the oil storage container such as the actuator and the accumulator is calculated and identified. The oil level change of the hydraulic system can be comprehensively known.

[0039] 1. In-flight hydraulic oil level health monitoring and leakage early warning identification:

[0040] By comprehensively identifying the actuator position, the accumulator pressure and the current pressure of the system, the expected range of the oil level in the hydraulic system can be calculated. If the oil level is continuously lower than the expected value for a period of time or the oil level is rapidly lower than the expected value, it can be judged that the system has an abnormal leakage at this time.

[0041] 2. Hydraulic oil level health monitoring during ground maintenance:

[0042] The hydraulic oil level monitoring system is provided with continuous monitoring and recording. During ground maintenance, the maintenance personnel can give self-checking instructions to the hydraulic oil level monitoring system through the controller. At this time, the oil level monitoring system automatically identifies the oil level in the container storing additional oil such as the actuator position and the accumulator pressure, calculates and evaluates the change of the hydraulic oil level relative to the previous reference value, and gives guidance to the maintenance personnel whether to supplement the oil quantity.

[0043] Embodiment

[0044] The helicopter hydraulic system oil level health monitoring method is realized based on the oil level health monitoring system. The oil level health monitoring system comprises an actuator position signal sensor 1, an actuator 2, a hydraulic oil tank 3, an oil level signal sensor 4, an accumulator 5, a pressure signal sensor 6, a comprehensive computer 7, a display 8 and a detection controller 9. The position sensor 1 monitors the current displacement of the piston in the actuator 2 in real time, and feeds back the displacement information to the comprehensive computer 7. The oil level signal sensor 4 detects the oil level in the hydraulic oil tank 3 in real time, and feeds back the oil volume in the oil tank to the comprehensive computer 7. The pressure signal sensor 6 detects the oil pressure in the accumulator in real time, and feeds back the accumulator pressure to the comprehensive computer 7. The comprehensive computer 7 calculates based on the parameters fed back by the position signal sensor 1, the oil level signal sensor 4 and the pressure signal sensor 6 to obtain the oil volume information of the hydraulic system, which is displayed on the parameter display 8 in real time. The oil detection controller 9 is used to calibrate the initial oil volume and compare the current oil volume with the initial oil volume.

[0045] The real-time monitoring method is as follows:

[0046] Step 1: The actuator position sensor 1 feeds back the actuator 2 piston position to the comprehensive computer 7. The initial current piston position is set as L1 (when the actuator is retracted to the shortest, the piston is the initial position, and the displacement is 0).

[0047] Step 2, the oil level sensor 4 detects the oil level in the hydraulic oil tank 3 in real time, and feeds back the oil level information in the tank to the comprehensive computer 7, and the oil level is set as H1;

[0048] Step 3, the pressure sensor 6 detects the oil pressure in the accumulator in real time, and feeds back the accumulator pressure to the comprehensive computer 7, and the feedback pressure is set as P1;

[0049] Step 4, the comprehensive computer 7 calculates the oil volume at this time according to the piston position parameter L1, the oil level parameter H1 and the accumulator pressure P1, and the formula is as follows:

[0050] 7) Set the actuator to extend, the piston rod cross-sectional area S r , the oil inlet cavity area is S1, and the other cavity area is S2 (assuming that the other cavity is a rodless cavity); the number of actuators is n, and the maximum stroke of the actuator is L0, and the oil volume in the actuator at this time is:

[0051] V1=(L1×S2+(L0-L1)×(S1-S r ))×n

[0052] 8) Set the hydraulic oil tank cross-sectional area as S t , the oil level is 0 when the oil tank is empty, and the oil volume in the hydraulic oil tank at this time is:

[0053] V2=H1×S t

[0054] 9) Set the gas cavity inflation pressure as P g , the maximum pressure of the accumulator is P max , the structure volume of the accumulator is V s , and the gas polytropic process index is n g , and the oil volume in the accumulator at this time is:

[0055]

[0056] Step 5, the comprehensive computer 7 adds the oil volume, that is, V 总 =V1+V2+V3, and displays V3 on the parameter display 8;

[0057] In some embodiments of the present application, on this basis, when maintaining, the oil level initial calibration and comparison steps are as follows:

[0058] 1. Record the oil volume at this time to the comprehensive computer 7 through the calibration button 1 of the oil detection controller 9, and define it as the initial calibration oil volume V b ;

[0059] In some embodiments of the present application, when the contrast button 2 is pressed, the comprehensive computer 7 calculates the current oil volume, which is set as V t , and calculates the difference (ΔV=V b -V t ) with the initial calibration oil volume V b ; and displays the current oil volume V t , the initial oil volume V b , and the difference ΔV on the display 8.

[0060] In some embodiments of the present application, before the step 1, the helicopter should be powered on.

[0061] In some embodiments of the present application, when the initial oil level calibration is performed, the on-board hydraulic system oil amount should be within the specified normal range.

[0062] In some embodiments of the present application, when the actuator position signal sensor 1 fails to collect signals, the comprehensive computer 7 should transmit the fault information "actuator position signal sensor fails to collect signals" to the display 8 and display it on the display 8, and at this time, it is recommended to replace the actuator position signal sensor 1.

[0063] In some embodiments of the present application, when the oil level signal sensor 4 fails to collect signals, the comprehensive computer 7 should transmit the fault information "oil level signal sensor fails to collect signals" to the display 8 and display it on the display 8, and at this time, it is recommended to replace the oil level signal sensor 4.

[0064] In some embodiments of the present application, when the pressure signal sensor 6 fails to collect signals, the comprehensive computer 7 should transmit the fault information "pressure signal sensor fails to collect signals" to the display 8 and display it on the display 8, and at this time, it is recommended to replace the pressure signal sensor 8.

[0065] In some embodiments of the present application, the actuator should be a single-piston single-rod type with a fixed cylinder and a moving piston rod, and the cylinder is supplied with oil and moves bidirectionally.

[0066] In some embodiments of the present application, the hydraulic oil tank should have a regular cross-sectional area structure, i.e., the cross-sectional area of each height of the tank is equal.

[0067] In some embodiments of the present application, the pressure accumulator should be a pneumatic pressure accumulator.

[0068] Another solution is that the daily maintenance personnel do not need to pay attention to and calculate the hydraulic oil level, and when the hydraulic oil level reaches the range that needs to be replenished, the hydraulic oil level monitoring system automatically prompts the maintenance personnel to replenish the oil.

[0069] As used herein, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is also to be understood that terms such as those defined in commonly used dictionaries are to take on ordinary and customary meanings unless otherwise explicitly provided for herein and are to be interpreted as being indicative of the intent of the inventors to invoke a special definition beneficial over conclusions from a more customary, semantic meaning of term, unless otherwise explicitly provided for herein. The summary of the application described above, the detailed description of the application described below, and the drawings illustrate the state of the art, and are not limiting of the present application. It will be readily understood to those skilled in the art that the application is susceptible to broad disposal and use, and that the above described embodiments are only exemplary of the principles of the application and are not to be considered limitation on the scope of the application. Accordingly, the scope of the application is not intended to be limited to the above described embodiments but rather is capable of extending to other embodiments and uses thereof which come within the scope of the following claims and their equivalents.

Claims

1. A method for monitoring the health of hydraulic system fluid levels in a helicopter, characterized in that, This system is based on a hydraulic level health monitoring system, which includes an actuator position signal sensor, an actuator, a hydraulic oil tank, an oil level signal sensor, an accumulator, a pressure signal sensor, a comprehensive computer, a display, and a detection controller. The position sensor monitors the current displacement of the piston within the actuator in real time and feeds this displacement information back to the comprehensive computer. The oil level signal sensor detects the oil level in the hydraulic oil tank in real time and feeds back the oil volume to the comprehensive computer. The pressure signal sensor detects the oil pressure in the accumulator in real time and feeds back the accumulator pressure to the comprehensive computer. The comprehensive computer calculates the hydraulic system oil volume information based on the parameters fed back from the position signal sensor, oil level signal sensor, and pressure signal sensor, and displays this information in real time on the parameter display. The oil detection controller is used to calibrate the initial oil volume and compare the current oil volume with the initial oil volume. The real-time monitoring method is as follows: Step 1: The actuator position sensor feeds back the actuator piston position to the integrated computer. The initial current piston position is set to L1. When the actuator is retracted to its shortest position, the piston is in the initial position, and the displacement is 0. Step 2: The oil level signal sensor detects the oil level in the hydraulic oil tank in real time and feeds back the oil level information in the tank to the integrated computer. The oil level is set to H1. Step 3: The pressure signal sensor detects the oil pressure in the accumulator in real time and feeds back the accumulator pressure to the integrated computer. The feedback pressure is set to P1. Step 4: The computer calculates the oil volume at this time based on the piston position parameter L1, oil level parameter H1, and accumulator pressure P1, using the following formula: 1) Assume that when the actuator extends, the cross-sectional area S of the piston rod is... r When extended, the area of ​​the oil inlet chamber is S1, and the area of ​​the other side chamber is S2; the number of actuators is n, and the maximum stroke of the actuator is L0. At this time, the oil volume in the actuator is: V1=(L1×S2+(L0-L1)×(S1-S2)) r ))×n 2) Let the cross-sectional area of ​​the hydraulic oil tank be S. t When the oil tank is empty, the oil level is 0. At this time, the volume of oil in the hydraulic oil tank is: V2 = H1 × S t 3) Let the inflation pressure of the air chamber be P. g The maximum pressure of the accumulator is Pmax The accumulator has a structural volume of V. s The polytropic gas process index is n g At this time, the volume of oil in the accumulator is: Step 5: The computer sums up the oil volumes, i.e., Vtotal = V1 + V2 + V3, and displays V3 on the parameter display.

2. The method as described in claim 1, characterized in that, During maintenance, the initial calibration and comparison steps for the oil level are as follows:

1. Record the current oil volume in the integrated computer using calibration button A on the oil level detection controller, and define it as the initial calibration oil volume V. b .

3. The method as described in claim 2, characterized in that, 2. During maintenance and comparison, press the comparison button B. The computer will calculate the current oil volume and set it to V. t and compared with the initial calibration oil volume V b Perform the difference calculation, ΔV = V t -V b ; and the current oil volume V t Initial oil volume V b The difference ΔV is displayed on the monitor.

4. The method as described in claim 3, characterized in that, Before step 1, the helicopter should be powered on.

5. The method as described in claim 4, characterized in that, When performing the initial oil level calibration, ensure that the oil level in the machine's hydraulic system is within the specified normal range.

6. The method as described in claim 5, characterized in that, When the actuator position signal sensor fails to acquire a signal, the integrated computer should transmit the fault information "Actuator position signal sensor cannot acquire signal" to the display and display it on the screen. In this case, it is recommended to replace the actuator position signal sensor.

7. The method as described in claim 6, characterized in that, When the oil level signal sensor fails to acquire a signal, the integrated computer should transmit the fault information "oil level signal sensor cannot acquire signal" to the display and display it on the screen. In this case, it is recommended to replace the oil level signal sensor.

8. The method as described in claim 7, characterized in that, When the pressure signal sensor fails to acquire a signal, the integrated computer should transmit the fault information "accumulator pressure signal sensor cannot acquire signal" to the display and display it on the screen. In this case, it is recommended to replace the pressure signal sensor.

9. The method as described in claim 8, characterized in that, The actuator should be a single-piston, single-rod, cylinder-supplying, bidirectional motion type with a fixed cylinder and a moving piston rod.

10. The method as described in claim 9, characterized in that, The hydraulic oil tank should have a regular cross-sectional area for the oil storage chamber, meaning that the cross-sectional area of ​​each height of the oil tank is equal, and the accumulator should specifically be a pneumatic accumulator.

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