Model rotor trailing edge flap angle measuring device

Abstract

The utility model provides a model rotor trailing edge flap angle measuring device, which comprises a blade body 1, a trailing edge flap 2, a permanent magnet 3 and a magneto-dependent sensor 4, and is characterized in that the trailing edge flap is connected to the blade body, can deflect relative to the blade body, and can generate deflection movement relative to the blade; the permanent magnet is arranged on the side face of the trailing edge flap and fixed relative to the trailing edge flap so as to deflect along with the trailing edge flap. The magneto-dependent sensor is integrated with a magneto-dependent element and an amplifying circuit and is arranged on the side face, opposite to the permanent magnet, of the paddle body, and the magneto-dependent sensor and the permanent magnet act on each other to measure the deflection angle of the trailing edge flap relative to the paddle body; the magneto-dependent sensor (4) includes a magneto-dependent element (42) and an amplifying circuit (41).

Description

Technical Field

[0001] This application belongs to the field of engineering technology and relates to a device for measuring the angle of the trailing-edge flap of a model rotor. Background Technique

[0002] The trailing-edge flap type intelligent rotor is a very promising new rotor system, which takes measures from the source of helicopter vibration and noise, the rotor, to reduce vibration and noise. It controls the deflection of the trailing-edge flap of the blade to generate additional high-order harmonic aerodynamic forces on the blade lift surface. By appropriately controlling the amplitude, frequency, and phase of these high-order harmonic aerodynamic forces, the corresponding high-order harmonic components in the blade distributed load can be effectively offset to achieve the purpose of vibration reduction. Since the trailing-edge flap is arranged at the outer end of the blade with a relatively high dynamic pressure, a small angle of deflection can cause a large change in the aerodynamic load. By precisely controlling the deflection of the trailing-edge flap, the aerodynamic load distribution on the blade can be changed to achieve the purpose of reducing the vibration load of the rotor. Therefore, accurately measuring the deflection angle of the trailing-edge flap is one of the key links for the intelligent rotor to achieve vibration reduction and noise reduction.

[0003] At present, laser sensors and magnetic sensors are mainly used to measure the trailing-edge flap deflection angle on helicopter blades at home and abroad. Among them, the laser sensor can only be used to measure the trailing-edge flap deflection angle of the blade in the non-rotating state, while the magnetic sensor is applicable to both the rotating state and the non-rotating state. To improve the accuracy, the magnetic sensor usually uses an integrated circuit for signal amplification. However, for a model rotor, due to the limitations of the blade chord length and blade thickness, the permanent magnet is usually installed at the leading edge of the flap, and the magnetic sensing element is placed at the trailing edge of the blade corresponding to the permanent magnet. However, this method has a change in the distance between the permanent magnet and the magnetic sensing element during the deflection of the flap, resulting in the measured angle being affected not only by the angle between the magnetic induction line but also by the change in the magnetic field strength. Therefore, there is a problem with the measurement accuracy of this magnetic sensor. Utility Model Content

[0004] The purpose of this application is: a device for measuring the angle of the trailing-edge flap of a model rotor, which structure not only improves the angle measurement accuracy of the trailing-edge flap, but also does not damage the aerodynamic environment of the trailing-edge flap. Moreover, the angle measurement device of this structure is convenient to install, and can meet the limited space of the blade and the complex centrifugal force use environment.

[0005] The technical solution of this application is: a device for measuring the angle of the trailing-edge flap of a model rotor, the device includes a blade body 1, a trailing-edge flap 2, a permanent magnet 3, and a magnetic sensor 4, where:

[0006] The trailing edge flap 2 is connected to the blade body 1 and can deflect relative to the blade body 1, capable of generating a deflection motion relative to the blade; the permanent magnet 3 is arranged on the side of the trailing edge flap 2 and is relatively fixed to the trailing edge flap 2 to deflect along with the trailing edge flap 2; the magnetic sensor 4 is a magnetic sensor 4 integrated with a magnetic sensitive element 42 and an amplifier circuit 41, arranged on the side of the blade body 1 opposite to the permanent magnet 3, and the magnetic sensor 4 interacts with the permanent magnet 3 to measure the deflection angle of the trailing edge flap 2 relative to the blade body; the magnetic sensor 4 includes a magnetic sensitive element 42 and an amplifier circuit 41. When the trailing edge flap 2 deflects, it drives the permanent magnet 3 arranged on its side to rotate, causing a change in the magnetic field direction. The magnetic sensitive element 42 arranged on the blade body 1 senses the magnetic induction lines of the permanent magnet 3, and the signal is amplified by the amplifier circuit 41, thereby obtaining the deflection angle of the trailing edge flap 2 to be measured.

[0007] Specifically, the permanent magnet 3 adopts a cylindrical permanent magnet. According to the deflection motion of the trailing edge flap 2 and the N and S pole directions of the permanent magnet, the position of the permanent magnet 3 is set in the trailing edge flap 2 in advance, and the permanent magnet 3 and the trailing edge flap 2 are integrally formed by co-curing.

[0008] Specifically, the magnetic sensor 4 is divided into a rectangular installation area 44 and a tapered area 45 according to the external shape structure of the magnetic sensor 4.

[0009] Specifically, the rectangular installation area 44 refers to the part where the magnetic sensor 4 is installed inside the blade body 1. This part adopts the form of two-stage rectangular slots so that the magnetic sensor 4 can be inserted into the blade for fixation. The rectangular installation area is provided with an amplifier circuit 41 for amplifying the signal of the magnetic sensitive element 42.

[0010] Specifically, the tapered area 45 refers to the part of the integrated circuit board outside the blade body 1. The external shape of this part is manufactured into the shape of the trailing edge airfoil of the blade, which can enable the blade to maintain the aerodynamic flow field distribution of the tapered area during operation after installing the magnetic sensor 4; the magnetic sensitive element 42 is arranged at the inner end of the tapered area 45.

[0011] Specifically, the magnetic sensor 4 is arranged on the side of the flap and the corresponding side of the blade; the permanent magnet 3 is installed on the side of the trailing edge flap 2 close to the root; the magnetic sensor 4 is installed on the side of the blade body 1 corresponding to the side of the trailing edge flap 2; the magnetic sensitive element 42 is arranged in the tapered area of the magnetic sensor 4 and is parallel to the side of the trailing edge flap 2 where the permanent magnet 3 is installed.

[0012] The advantages of this application are as follows: A device for measuring the angle of the trailing edge flap of a model rotor. This structure not only improves the angle measurement accuracy of the trailing edge flap but also does not damage the aerodynamic environment of the trailing edge flap. Moreover, the angle measurement device of this structure is convenient to install and can meet the limited space of the blade and the complex centrifugal force use environment. Description of the Drawings

[0013] Figure 1 Schematic diagram of an angle measurement device for the trailing edge flap of a model rotor blade provided by the present application;

[0014] Figure 2 Schematic diagram of a magnetic sensor provided by the present application;

[0015] Figure 3 Schematic diagram of the relative position between a magnetic sensor and a permanent magnet provided by the present application;

[0016] Among them, 1 - blade body, 2 - trailing edge flap, 3 - permanent magnet, 4 - magnetic sensor, 42 - magnetic sensitive element, 41 - amplifier circuit, 43 - screw hole, 44 - rectangular installation area, 45 - conical area. Detailed Description of the Invention

[0017] This method comprehensively considers the space limitation of the model rotor blade and the usage conditions of the magnetic sensor, and designs an angle measurement device for the trailing edge flap of the model rotor blade. This structure not only improves the angle measurement accuracy of the trailing edge flap, but also does not damage the aerodynamic environment of the trailing edge flap. Moreover, the angle measurement device of this structure is easy to install, and can meet the narrow space limitation of the blade and the complex centrifugal force usage environment.

[0018] The following further details the present utility model.

[0019] As Figure 1 shown, the present application provides an angle measurement device for the trailing edge flap of a model rotor blade, including a blade body 1, a trailing edge flap 2, a permanent magnet 3 and a magnetic sensor 4, where:

[0020] The trailing edge flap is connected to the blade body and can deflect relative to the blade body, generating a deflection movement relative to the blade; the permanent magnet is arranged on the side of the trailing edge flap and is relatively fixed to the trailing edge flap to deflect with the trailing edge flap; the magnetic sensor is a magnetic sensor integrated with a magnetic sensitive element and an amplifier circuit, arranged on the side of the blade body opposite to the permanent magnet, and the magnetic sensor interacts with the permanent magnet to measure the deflection angle of the trailing edge flap relative to the blade body; the magnetic sensor 4 includes a magnetic sensitive element 42 and an amplifier circuit 41. When the trailing edge flap deflects, it drives the permanent magnet arranged on its side to rotate, causing a change in the magnetic field direction. The magnetic sensitive element arranged on the blade body senses the magnetic induction lines of the permanent magnet, and the signal is amplified by the amplifier circuit, so as to obtain the deflection angle of the trailing edge flap to be measured.

[0021] Specifically, the blade body 1 adopts a pair of model rotor composite blades with a diameter of four meters.

[0022] Specifically, the permanent magnet 3 is a cylindrical permanent magnet. The position of the permanent magnet is set in advance in the trailing edge flap according to the deflection movement of the flap and the north and south pole directions of the permanent magnet. The permanent magnet and the trailing edge flap are integrated by co-solidification.

[0023] Specifically, such as Figure 2 As shown, the magnetic sensor 4 is divided into a rectangular installation area 44 and a dimensional area 45 according to the external structure of the magnetic sensor;

[0024] The rectangular installation area refers to the part where the magnetic sensor is installed inside the blade body. This part adopts the form of a two-level rectangular slot so that the magnetic sensor can be inserted into the blade and fixed. The rectangular installation area is provided with an amplification circuit for amplifying the signal of the magnetic sensor.

[0025] The dimensional zone refers to the portion of the integrated circuit board outside the blade body. This portion is shaped like the blade's trailing edge airfoil, ensuring that the aerodynamic flow field distribution in the dimensional zone is maintained during operation after the magnetic sensor is installed. A magnetic sensor is located at the inner end of the dimensional zone.

[0026] Specifically, there is a 2mm Ø screw hole in the center of the dimensional area, which is used to tightly fix the magnetic sensor and the blade together through screws. In addition, the two-level slot design in the rectangular area ensures the tight assembly of the magnetic sensor in a high centrifugal force environment.

[0027] Specifically, the magnetic sensor uses hot melt adhesive to seal the integrated circuit and the magnetic sensor element to protect the circuit.

[0028] Specifically, the magnetic sensor is arranged on the side of the flap and the corresponding side of the blade; the permanent magnet is installed on the leading edge side of the trailing edge flap; the magnetic sensor is installed on the side of the blade body corresponding to the side of the trailing edge flap; the magnetic sensitive element is arranged in the dimensional area of the magnetic sensor, parallel to the side of the trailing edge flap where the permanent magnet is installed.

[0029] In practical applications, the distance L between the permanent magnet and the magnetic sensitive element is: 1.5mm±0.01mm.

[0030] like Figure 3 As shown, the position between the flap side and the corresponding blade side remains basically unchanged during the deflection process of the trailing edge flap. Therefore, arranging the magnetic sensor on the flap side and the corresponding blade side can effectively eliminate the accuracy problem caused by the field strength change.

[0031] In summary, the present application provides a model rotor trailing edge flap angle measurement device, which not only improves the angle measurement accuracy of the trailing edge flap without destroying the aerodynamic environment of the trailing edge flap, but also the angle measurement device of this structure is easy to install and can meet the narrow space limitations of the blade and the complex centrifugal force usage environment.

Claims

1. A device for measuring the angle of a trailing edge flap of a model rotor, characterized in that, The device includes a blade body (1), a trailing edge flap (2), a permanent magnet (3), and a magnetic sensor (4), where: The trailing edge flap (2) is connected to the blade body (1) and can deflect relative to the blade body (1), capable of generating a deflection motion relative to the blade; the permanent magnet (3) is disposed on the side of the trailing edge flap (2) and is relatively fixed to the trailing edge flap (2) to deflect along with the trailing edge flap; the magnetic sensor (4) is a magnetic sensor integrated with a magnetic sensitive element (42) and an amplifier circuit (41), disposed on the side of the blade body (1) opposite to the permanent magnet (3), and the magnetic sensor (4) interacts with the permanent magnet (3) to measure the deflection angle of the trailing edge flap (2) relative to the blade body (1); the magnetic sensor (4) includes the magnetic sensitive element (42) and the amplifier circuit (41). When the trailing edge flap (2) deflects, it drives the permanent magnet (3) disposed on its side to rotate, causing a change in the magnetic field direction. The magnetic sensitive element (42) disposed on the blade body (1) senses the magnetic induction lines of the permanent magnet (3), and the signal is amplified by the amplifier circuit (41), thereby obtaining the deflection angle of the trailing edge flap (2) to be measured.

2. The device according to claim 1, wherein The permanent magnet (3) is a cylindrical permanent magnet. According to the deflection motion of the trailing edge flap (2) and the N and S pole directions of the permanent magnet (3), the position of the permanent magnet (3) is set in the trailing edge flap (2) in advance, and the permanent magnet (3) and the trailing edge flap (2) are integrally formed by co-curing.

3. The device according to claim 1, characterized in that The magnetic sensor (4) is divided into a rectangular installation area (44) and a tapered area (45) according to the external shape structure of the magnetic sensor.

4. The device according to claim 1, characterized in that, The rectangular installation area (44) refers to the part where the magnetic sensor (4) is installed inside the blade body (1). This part adopts the form of two-stage rectangular slots so that the magnetic sensor (4) can be inserted into the blade body (1) for fixation. The rectangular installation area is provided with the amplifier circuit (41) for amplifying the signal of the magnetic sensitive element (42).

5. The device according to claim 1, characterized in that, The tapered area (45) refers to the part of the integrated circuit board outside the blade body (1). The external shape of this part is manufactured into the shape of the blade trailing edge airfoil, which can enable the blade to maintain the aerodynamic flow field distribution of the tapered area during operation after the magnetic sensor (4) is installed; the magnetic sensitive element (42) is disposed at the inner end of the tapered area (45).

6. The device according to claim 1, characterized in that The magnetic sensor (4) is arranged on the side of the trailing edge flap (2) and the corresponding side of the blade body (1); the permanent magnet (3) is installed on the leading edge side of the trailing edge flap (2); the magnetic sensor (4) is installed on the side of the blade body (1) corresponding to the side of the trailing edge flap (2); the magnetic sensitive element (42) is arranged in the tapered area (45) of the magnetic sensor (4) and is parallel to the side of the trailing edge flap (2) where the permanent magnet (3) is installed.

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