A method and apparatus for measuring the center of mass of a rotating composite blade

Abstract

This application provides a method and apparatus for measuring the center of mass of a rotating composite material blade. The method includes: Step 1: Calculating the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O; Step 2: Calculating the spanwise center of mass of the composite material blade based on the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O; Step 3: Calculating the spanwise static moment of the composite material blade based on the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O; Step 4: Calculating the chordwise center of mass of the composite material blade based on the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O.

Description

Technical Field

[0001] This invention belongs to the field of composite material blade forming and testing, specifically relating to a method and device for measuring the centroid of a rotating composite material blade. Background Technology

[0002] Due to the randomness of the manufacturing process of composite blades, the weight and center of mass of each blade have slight differences. They must be adjusted through static balance tests to meet the requirement that the spanwise static moment, spanwise center of mass, and chordwise center of mass of each blade are consistent.

[0003] The original measurement technology used two sets of measuring fixtures (spanwise measurement and chordwise measurement) to measure the chordwise and spanwise centroids of the blade in one go. The clamping accuracy was poor, the operation was difficult, and the measurement repeatability was poor. Summary of the Invention

[0004] This application provides a method and apparatus for measuring the centroid of a rotating composite material blade, which can solve the problems of poor clamping accuracy, high operation difficulty, and poor measurement repeatability.

[0005] In a first aspect, this application provides a method for measuring the centroid of a rotating composite material blade, the method comprising:

[0006] Step 1: Calculate the relative position of the centroid C(x, y) with respect to the zero point O in the XY plane;

[0007] Step 2: Calculate the spanwise centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O;

[0008] Step 3: Calculate the spanwise static moment of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O;

[0009] Step 4: Calculate the chordal centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0010] Specifically, step 1 includes:

[0011] Using formula Calculate the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O, where α is the clockwise rotation angle of the blade about the Z-axis.

[0012] ΔT X Here, k represents the change in unbalanced torque from the X-axis sensor, k represents the measured input value, and k represents the input value. X The X-axis sensor has a constant coefficient ΔT after equipment calibration. Y Here, k represents the change in unbalanced torque from the Y-axis sensor. YThis is a constant coefficient for the Y-axis sensor after equipment calibration.

[0013] Specifically, step 2 includes:

[0014] Step 21: Obtain the difference x1 between the bushing pin and the spanwise position of the rotating shaft of the blade centroid measuring device;

[0015] Step 22: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position of the rotor rotation center;

[0016] Step 23: Calculate the spanwise centroid of the composite blade using the formula x + x1 + x2, where x is the X-axis coordinate of the centroid C in the XY plane.

[0017] Specifically, step 3 includes:

[0018] Step 31: Obtain the difference x1 between the bushing pin and the spanwise position of the rotating shaft of the blade centroid measuring device;

[0019] Step 32: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position of the rotor rotation center;

[0020] Step 33: Obtain the mass m of the composite material blade;

[0021] Step 33: Calculate the spanwise static moment of the composite material blade using the formula (x+x1+x2)*m.

[0022] Specifically, step 4 includes:

[0023] Step 41: Obtain the difference y1 between the leading edge limiting block of the profile block and the chordal position (Y-axis) of the rotation axis of the blade centroid measuring device;

[0024] Step 42: Calculate the chordal centroid of the composite blade using the formula y+y1, where y is the Y-axis coordinate of the centroid C in the XY plane.

[0025] Specifically, under the premise that the composite blades are in the same weight class, by replacing the root clamp, profile block, and tip counterweight corresponding to the composite blades, and modifying the normal parameters x1, x2, and y1, the center of mass of the composite blades of different models can be tested.

[0026] Secondly, this application provides a rotary composite material blade centroid measuring device, the device including a relative position calculation unit, a spanwise centroid calculation unit, a spanwise static moment calculation unit, and a chordwise centroid calculation unit, wherein:

[0027] The relative position calculation unit is used to calculate the relative position of the centroid C(x, y) in the XY plane relative to the zero point O;

[0028] The spanwise centroid calculation unit is used to calculate the spanwise centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0029] The spanwise static moment calculation unit is used to calculate the spanwise static moment of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0030] The chordal centroid calculation unit is used to calculate the chordal centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0031] Specifically, the relative position calculation unit is used for:

[0032] Using formula Calculate the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O, where α is the clockwise rotation angle of the blade about the Z-axis.

[0033] ΔT X Here, k represents the change in unbalanced torque from the X-axis sensor, k represents the measured input value, and k represents the input value. X The X-axis sensor has a constant coefficient ΔT after equipment calibration. Y Here, k represents the change in unbalanced torque from the Y-axis sensor. Y This is a constant coefficient for the Y-axis sensor after equipment calibration.

[0034] In summary, this application proposes a novel method and device for measuring the center of mass of a rotating composite material blade. This method uses a bushing pin and a contour block for mutual positioning, rotating the blade and obtaining multi-angle unbalanced torque variation data through a high-precision sensor. The measured results (spanwise static moment, spanwise center of mass, and chordwise center of mass) are calculated using a built-in formula and directly displayed on the screen. The entire process is convenient and simple, avoiding experimental errors caused by improper clamping; the high-precision sensor ensures high measurement accuracy and repeatability; and the measurement results are displayed rapidly, avoiding calculation errors caused by manual calculation. Attached Figure Description

[0035] Figure 1 This application provides a schematic diagram of a blade rotating with a centroid measuring device;

[0036] Figure 2 This application provides a schematic diagram of the centroid measurement principle. Detailed Implementation

[0037] This application proposes a method for measuring the centroid of a rotating composite material propeller blade, which enables rapid and accurate measurement of the centroid parameters of each blade. While ensuring measurement accuracy, it improves measurement repeatability, facilitates operator operation, and increases measurement efficiency.

[0038] Example 1

[0039] like Figure 1-2 As shown, this application provides a method for measuring the centroid of a rotating composite material blade, the method comprising:

[0040] Step 1: Calculate the relative position of the centroid C(x, y) with respect to the zero point O in the XY plane;

[0041] Specifically, step 1 includes:

[0042] Using formula Calculate the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O, where α is the clockwise rotation angle of the blade about the Z-axis.

[0043] ΔT X Here, k represents the unbalanced torque change value of the X-axis sensor (difference between point 1 and point 2), k represents the measurement input value. X The X-axis sensor has a constant coefficient ΔT after equipment calibration. Y Here, k represents the change in unbalanced torque of the Y-axis sensor (difference between point 1 and point 2), k is the measurement input value. Y This is a constant coefficient for the Y-axis sensor after equipment calibration.

[0044] It should be noted that the principle of step 1 is as follows:

[0045] Use tooling fixtures to make the 25% chord plane horizontal, with the centroid C(x, y) in the XY plane;

[0046] The center of the rotating platform of the centroid measuring equipment is the zero point O, and the straight line passing through the zero point and perpendicular to the XY plane is the axis of rotation, the Z-axis;

[0047] The distance between the centroid and the part is l;

[0048] The blade rotates counterclockwise by α around the Z-axis, with the center of mass at position A (point 1). The blade rotates clockwise by α around the Z-axis, with the center of mass at position B (point 2).

[0049] The angle between OC and the -X axis is θ, and the angle between AB and the -X axis is Φ.

[0050] From geometric relationships, we know that:

[0051] X=-lcosθ, y=lsinθ;——①

[0052] Since AB⊥OC, we know

[0053] Depend on have to

[0054] solid

[0055] consider Combining equation ①, we get

[0056] Therefore, by solving equation ②, we can obtain the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0057] Step 2: Calculate the spanwise centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O;

[0058] Specifically, step 2 includes:

[0059] Step 21: Obtain the difference x1 between the bushing pin and the spanwise position (X-axis) of the blade centroid measuring device;

[0060] Step 22: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position (X-axis) of the rotor rotation center;

[0061] Step 23: Calculate the spanwise centroid of the composite blade using the formula x + x1 + x2, where x is the X-axis coordinate of the centroid C in the XY plane.

[0062] Step 3: Calculate the spanwise static moment of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O;

[0063] Specifically, step 3 includes:

[0064] Step 31: Obtain the difference x1 between the bushing pin and the spanwise position (X-axis) of the blade centroid measuring device;

[0065] Step 32: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position (X-axis) of the rotor rotation center;

[0066] Step 33: Obtain the mass m of the composite material blade;

[0067] Step 33: Calculate the spanwise static moment of the composite material blade using the formula (x+x1+x2)*m.

[0068] Step 4: Calculate the chordal centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O.

[0069] Specifically, step 4 includes:

[0070] Step 41: Obtain the difference y1 between the leading edge limiting block of the profile block and the chordal position (Y-axis) of the rotation axis of the blade centroid measuring device;

[0071] Step 42: Calculate the chordal centroid of the composite blade using the formula y+y1, where y is the Y-axis coordinate of the centroid C in the XY plane.

[0072] It should be noted that the principle behind step 2 is as follows:

[0073] The blades are clamped and positioned using root clamps and contour blocks.

[0074] The difference x1 between the bushing pin and the spanwise position (X-axis) of the rotating shaft is known, and the difference y1 between the leading edge limiting block of the contour block and the chordwise position (Y-axis) of the rotating shaft is known.

[0075] In addition, the difference x2 between the bushing pin and the spanwise position (X-axis) of the rotor rotation center is known;

[0076] therefore,

[0077] Extending towards the center of mass = x + x1 + x2; —③

[0078] Spanning static moment = (x + x1 + x2) * m, where m is the blade mass, which is obtained by weighing with a high-precision electronic scale and then input.

[0079] The chord towards the center of mass = y + y1. ——④

[0080] At this point, the spanwise static moment, spanwise center of mass, and chordwise center of mass of the blade have all been measured.

[0081] Specifically, under the premise that the composite blades are in the same weight class, by replacing the root clamp, profile block, and tip counterweight corresponding to the composite blades, and modifying the normal parameters x1, x2, and y1, the center of mass of the composite blades of different models can be tested.

[0082] It should be noted that when using a 10Kg-level blade centroid measuring device to test the centroid of composite blades, the composite blades are considered to be in the same weight class if they are between 0-10Kg; when using a 40Kg-level blade centroid measuring device to test the centroid of composite blades, the composite blades are considered to be in the same weight class if they are between 10-40Kg.

[0083] Example 2

[0084] This application provides a method for measuring the centroid of a rotating composite material blade, which is used in conjunction with a blade centroid measuring device. The specific implementation method is as follows:

[0085] Step 1: Preparation;

[0086] Turn on the blade centroid measurement equipment and control computer, enter the centroid measurement software, and select the corresponding composite blade test interface according to the type of composite blade.

[0087] Step 2: Install the clamp;

[0088] Install the root clamp, profile block, and tip counterweight corresponding to the composite material blade, align the root clamp, profile block, and tip counterweight with the positioning line, and tighten the bolts to complete the installation.

[0089] Step 3: Conduct no-load tests on the root clamp, profile block, and tip counterweight corresponding to the composite material blade;

[0090] Specifically, step 3 includes:

[0091] Step 31: After the root clamp, the contour block and the tip counterweight are installed, lower the lifting platform of the blade center of mass measuring equipment to separate the lifting platform and support platform of the blade center of mass measuring equipment from the blade center of mass measuring equipment.

[0092] Step 32: Click "Jig Test" in the test program interface. After the blade centroid measuring device has finished running, calculate the centroid position of the blade centroid measuring device after the fixture is installed and display it on the software interface.

[0093] Step 33: Raise the lifting platform of the blade center of mass measuring equipment to support the blade center of mass measuring equipment.

[0094] Step 4: Install the standard composite material blade, as well as the root clamp, profile block and tip counterweight corresponding to the composite material blade, and perform calibration test;

[0095] Specifically, step 4 includes:

[0096] Step 4: Using the root bushing pin of the blade centroid measuring device as a reference for positioning, install the composite material standard blade and make the profile of the composite material standard blade fit with the profile of the contour block of the blade centroid measuring device.

[0097] Step 41: Input the blade number, standard weight, spanwise static moment, spanwise centroid, and chordwise centroid values ​​of the composite material standard blade into the software test interface of the blade centroid measurement device;

[0098] Step 42: After the standard composite blade is installed, lower the lifting platform of the blade centroid measuring equipment to separate the lifting platform support platform of the blade centroid measuring equipment from the measuring equipment.

[0099] Step 43: Click "Calibration Test" in the test program interface. After the equipment finishes running, calculate the position of the center of mass of the standard composite blade and compare it with the standard spanwise and chordwise centers of mass. The measurement calibration of the blade center of mass measurement equipment (including coefficient correction) is completed automatically.

[0100] Step 44: Raise the lifting platform of the blade centroid measuring equipment to support the blade centroid measuring equipment and remove the composite material standard blade.

[0101] Step 5: Test the composite material blade to be tested.

[0102] Specifically, step 5 includes:

[0103] Step 51: Using the root bushing pin of the blade centroid measuring device as a reference for positioning, install the composite material blade to be tested, and make the blade profile fit with the profile of the contour block of the blade centroid measuring device.

[0104] Step 52: Input the blade number and weight of the composite material blade to be tested into the software test interface of the blade centroid measurement device;

[0105] Step 53: After the composite material blade to be tested is installed, lower the lifting platform of the blade centroid measuring equipment to separate the lifting platform support platform of the blade centroid measuring equipment from the measuring equipment.

[0106] Step 54: Click "Blade Test" in the test program interface. After the equipment has finished running, calculate the spanwise static moment, spanwise centroid, and chordwise centroid values ​​of the composite material blade to be tested.

[0107] Step 55: Raise the lifting platform of the blade centroid measuring device to support the blade centroid measuring device and remove the composite material blade to be tested.

[0108] Step 6: Reset the blade centroid measuring equipment

[0109] Clean the area around the blade centroid measuring equipment to ensure it is free of foreign objects. Turn off the centroid measuring software, the control computer, and the power switches on the control box, and unplug the power cord.

[0110] In summary, this application provides a method and apparatus for measuring the centroid of a rotating composite material blade, which can quickly and accurately measure the centroid parameters of the blade; the testing method is combined with intelligent equipment, resulting in high measurement accuracy and improved measurement repeatability; it reduces manual operation, lowers human error, and improves measurement efficiency; with simple configuration adjustments, the equipment can be applied to other types of products, greatly reducing production costs.

Claims

1. A method of measuring the center of mass of a rotating composite blade, comprising: The methods include: Step 1: Calculate the relative position of the centroid C(x, y) with respect to the zero point O in the XY plane; The center of the rotating platform of the centroid measuring equipment is zero point O; Step 2: Calculate the spanwise centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O; Step 3: Calculate the spanwise static moment of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O; Step 4: Calculate the chordal centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O; Step 1 includes: Using the formula x= y= , △X= , △Y= Calculate the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O, where α is the clockwise rotation angle of the blade about the Z-axis. is an unbalanced moment change value of the X-axis sensor, and is a measurement input value, is a constant coefficient of the X-axis sensor after calibration of the apparatus, is an unbalanced moment change value of the Y-axis sensor, and is a measurement input value, is a constant coefficient of the Y-axis sensor after calibration of the apparatus.

2. The method of claim 1, wherein, Step 2 includes: Step 21: Obtain the difference x1 between the bushing pin and the spanwise position of the rotating shaft of the blade centroid measuring device; Step 22: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position of the rotor rotation center; Step 23: Calculate the spanwise centroid of the composite blade using the formula x + x1 + x2, where x is the X-axis coordinate of the centroid C in the XY plane.

3. The method of claim 1, wherein, Step 3 includes: Step 31: Obtain the difference x1 between the bushing pin and the spanwise position of the rotating shaft of the blade centroid measuring device; Step 32: Obtain the difference x2 between the bushing pin of the blade centroid measuring device and the spanwise position of the rotor rotation center; Step 33: Obtain the mass m of the composite material blade; Step 33: Calculate the spanwise static moment of the composite material blade using the formula (x+x1+x2)*m.

4. The method of claim 1, wherein, Step 4 includes: Step 41: Obtain the position difference y1 between the leading edge limiting block of the profile block and the chordal position of the rotating shaft of the blade centroid measuring device; Step 42: Calculate the chordal centroid of the composite blade using the formula y+y1, where y is the Y-axis coordinate of the centroid C in the XY plane.

5. The method according to claim 1, characterized in that, Under the premise that the composite blades are in the same weight class, by replacing the root clamp, profile block, and tip counterweight corresponding to the composite blades, and modifying the normal parameters x1, x2, and y1, the center of mass of the composite blades of different models can be tested.

6. A rotating composite material blade centroid measuring device, characterized in that, The device includes a relative position calculation unit, a spanwise centroid calculation unit, a spanwise static moment calculation unit, and a chordwise centroid calculation unit, wherein: The relative position calculation unit is used to calculate the relative position of the centroid C(x, y) in the XY plane relative to the zero point O; the center of the rotating platform of the centroid measuring device is the zero point O. The spanwise centroid calculation unit is used to calculate the spanwise centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O. The spanwise static moment calculation unit is used to calculate the spanwise static moment of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O. The chordal centroid calculation unit is used to calculate the chordal centroid of the composite blade based on the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O. The relative position calculation unit is specifically used for: Using the formula x= y= , △X= , △Y= Calculate the relative position of the centroid C(x, y) in the XY plane with respect to the zero point O, where α is the clockwise rotation angle of the blade about the Z-axis. Here, represents the change in unbalanced torque from the X-axis sensor, and represents the measurement input value. This is a constant coefficient for the X-axis sensor after equipment calibration. Here, represents the change in unbalanced torque from the Y-axis sensor, and represents the measured input value. This is a constant coefficient for the Y-axis sensor after equipment calibration.

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