Method and device for measuring mass center of rotary composite paddle

Abstract

The invention provides a method and device for measuring the mass center of a rotary composite paddle, and the method comprises the steps: 1, calculating the relative position of the mass center C (x, y) in an XY plane relative to a zero point O; 2, according to the relative position of the mass center C (x, y) in the XY plane relative to the zero point O, the spanwise mass center of the composite paddle is calculated; 3, according to the relative position of the mass center C (x, y) in the XY plane relative to the zero point O, the spanwise static moment of the composite paddle is calculated; and 4, calculating the chordwise centroid of the composite paddle according to the relative position of the centroid C (x, y) in the XY plane relative to the zero point O.

Description

Technical Field

[0001] The invention belongs to the field of composite material blade forming detection, and in particular relates to a method and a device for measuring the centroid of a rotary composite material blade. Background Art

[0002] Due to the randomness of the manufacturing process of composite blades, the weight and center of mass of each blade are slightly different, and the blades must be adjusted through static balance tests to meet the requirements of consistent spanwise static moment, spanwise center of mass, and chordwise center of mass for each blade.

[0003] The original measurement technology uses two sets of measuring tools (spanwise measurement and chordwise measurement) to measure the chordwise center of mass and spanwise center of mass of the blade respectively at one time. It has poor clamping accuracy, high operation difficulty and poor measurement repeatability. Summary of the invention

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

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

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

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

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

[0009] Step 4: Calculate the chord-wise center of mass of the composite blade based on the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane.

[0010] Specifically, step 1 includes:

[0011] Using the formula Calculate the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O, where α is the clockwise rotation angle of the blade around the Z axis,

[0012] ΔT X is the change value of the unbalanced torque of the X-axis sensor, is the measurement input value, k X is a constant coefficient of the X-axis sensor after equipment calibration, ΔT Y is the change value of the unbalanced torque of the Y-axis sensor, is the measured input value, k YA constant coefficient for the Y-axis sensor after device calibration.

[0013] Specifically, step 2 includes:

[0014] Step 21: Obtain the difference x1 between the spanwise position of the bushing pin of the blade center of mass measuring device and the rotation axis;

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

[0016] Step 23: Use the formula x+x1+x2 to calculate the spanwise center of mass of the composite blade, where x is the X-axis coordinate of the center of mass C in the XY plane.

[0017] Specifically, step 3 includes:

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

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

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

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

[0022] Specifically, step 4 includes:

[0023] Step 41: Obtain the difference y1 between the leading edge stopper of the profiling block of the blade mass center measuring device and the chord position (Y axis) of the rotating shaft;

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

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

[0026] In a second aspect, the present application provides a rotating composite blade centroid measurement device, the device comprising a relative position calculation unit, a spanwise centroid calculation unit, a spanwise static moment calculation unit and a chordwise centroid calculation unit, wherein:

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

[0028] A spanwise centroid calculation unit, used to calculate the spanwise centroid of the composite blade according to the relative position of the centroid C(x, y) relative to the zero point O in the XY plane;

[0029] A spanwise static moment calculation unit, used to calculate the spanwise static moment of the composite blade according to the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane;

[0030] The chord-wise center of mass calculation unit is used to calculate the chord-wise center of mass of the composite blade according to the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane.

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

[0032] Using the formula Calculate the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O, where α is the clockwise rotation angle of the blade around the Z axis,

[0033] ΔT X is the change value of the unbalanced torque of the X-axis sensor, is the measurement input value, k X is a constant coefficient of the X-axis sensor after equipment calibration, ΔT Y is the change value of the unbalanced torque of the Y-axis sensor, is the measured input value, k Y A constant coefficient for the Y-axis sensor after device calibration.

[0034] In summary, this application proposes a novel rotating composite blade center of mass measurement method and device, which uses a bushing pin and a contour block to limit the position together, rotates the blade, obtains multi-angle blade unbalance moment change data through a high-precision sensor, and directly displays the measurement results (spanwise static moment, spanwise center of mass, and chordwise center of mass) on the screen after calculation by a built-in formula. The whole process is convenient and simple, avoiding test errors caused by improper clamping; the high-precision sensor has high measurement accuracy, ensuring measurement repeatability; the measurement results are displayed quickly, avoiding calculation errors caused by manual calculations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a blade rotating with a center of mass measurement device provided in the present application;

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

[0037] This application proposes a rotating composite blade centroid measurement method, which is used to quickly and accurately measure the centroid parameters of each blade. Under the premise of ensuring measurement accuracy, it improves measurement repeatability, facilitates workers' operation, and improves measurement efficiency.

[0038] Embodiment 1

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

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

[0041] Specifically, step 1 includes:

[0042] Using the formula Calculate the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O, where α is the clockwise rotation angle of the blade around the Z axis,

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

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

[0045] Use a jig to make the 25% chord plane horizontal and the center of mass C(x, y) in the XY plane;

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

[0047] The distance between the center of mass and the part is l;

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

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

[0050] From the geometric relationship, we can know that:

[0051] X=-lcosθ, y=lsinθ;——①

[0052] Since AB⊥OC, we know

[0053] Depend on have to

[0054] solid

[0055] consider Combining formula ①, we get

[0056] So far, the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane is obtained by solving equation ②:

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

[0058] Specifically, step 2 includes:

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

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

[0061] Step 23: Use the formula x+x1+x2 to calculate the spanwise center of mass of the composite blade, where x is the X-axis coordinate of the center of mass C in the XY plane.

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

[0063] Specifically, step 3 includes:

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

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

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

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

[0068] Step 4: Calculate the chord-wise center of mass of the composite blade based on the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane.

[0069] Specifically, step 4 includes:

[0070] Step 41: Obtain the difference y1 between the leading edge stopper of the profiling block of the blade mass center measuring device and the chord position (Y axis) of the rotating shaft;

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

[0072] It should be noted that the principle of step 2 is:

[0073] The blades are clamped and positioned using root fixtures and profiling blocks.

[0074] The difference x1 between the spanwise position (X axis) of the bushing pin and the rotation axis is known, and the difference y1 between the front edge stopper of the profiling block and the chordwise position (Y axis) of the rotation axis 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] Spanwise centroid = x + x1 + x2; ——③

[0078] Spanwise static moment = (x+x1+x2)*m, where m is the blade mass, which is weighed by a high-precision electronic scale and then input;

[0079] Chordal mass center = y + y1. ——④

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

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

[0082] It should be noted that when using a 10Kg-level blade center of mass measuring device to test the center of mass of a composite blade, when the composite blade is in the range of 0-10Kg, they are said to be in the same weight class; when using a 40Kg-level blade center of mass measuring device to test the center of mass of a composite blade, when the composite blade is in the range of 10-40Kg, they are said to be in the same weight class.

[0083] Embodiment 2

[0084] The present application provides a method for measuring the centroid of a rotating composite 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 test interface of the corresponding composite blade according to the type of composite blade.

[0087] Step 2: Install the fixture;

[0088] Install the root clamp, profiling block and tip weight corresponding to the composite blade so that the root clamp, profiling block and tip weight coincide with the positioning lines respectively and tighten the bolts to complete the installation.

[0089] Step 3: Perform no-load tests on the root fixture, contour block and tip weight corresponding to the composite blade;

[0090] Specifically, step 3 includes:

[0091] Step 31: After the root fixture, the profiling block, and the blade tip counterweight are installed, the lifting platform of the blade center of mass measuring device is lowered to separate the lifting platform and the supporting platform of the blade center of mass measuring device from the blade center of mass measuring device;

[0092] Step 32: Click "Fixture Test" in the test program interface. After the blade center of mass measuring device has finished running, the center of mass position of the blade center of mass measuring device after the fixture is installed is calculated and displayed on the software interface.

[0093] Step 33: Raise the lifting platform of the blade center of mass measuring device so that it holds up the blade center of mass measuring device.

[0094] Step 4: Install the composite standard blade, as well as the root fixture, contour block and tip weight corresponding to the composite blade, and perform a calibration test;

[0095] Specifically, step 4 includes:

[0096] Step 4: Using the bushing pin at the root of the blade mass center measuring device as the reference for positioning, install the composite standard blade, and make the composite standard blade profile fit with the contour block profile of the blade mass center measuring device;

[0097] Step 41: Input the piece number, standard weight, spanwise static moment, spanwise center of mass, and chordwise center of mass of the composite standard blade in the software test interface of the blade center of mass measuring device;

[0098] Step 42: After the composite standard blade is installed, the lifting platform of the blade center of mass measuring device is lowered to separate the lifting platform support platform of the blade center of mass measuring device from the measuring device;

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

[0100] Step 44: Raise the lifting platform of the blade center of mass measuring device to hold up the blade center of mass measuring device and remove the composite standard blade.

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

[0102] Specifically, step 5 includes:

[0103] Step 51: Using the bushing pin at the root of the blade mass center measuring device as a reference for positioning, installing the composite blade to be tested, and making the profile of the composite blade to be tested fit with the profile of the profiling block of the blade mass center measuring device;

[0104] Step 52: Input the piece number and weight of the composite material blade to be tested in the software test interface of the blade center of mass measuring device;

[0105] Step 53: After the composite blade to be tested is installed, the lifting platform of the blade center of mass measuring device is lowered to separate the lifting platform support platform of the blade center of mass measuring device from the measuring device;

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

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

[0108] Step 6: Reset the blade center of mass measurement device

[0109] Clean the area around the blade centroid measurement equipment to make it clean and free of foreign matter, turn off the power switches on the centroid measurement software, control computer, and control box, and unplug the power supply.

[0110] In summary, the present application provides a method and device for measuring the center of mass of a rotating composite blade, which can quickly and accurately measure the center of mass parameters of the blade; the test method is combined with the use of intelligent equipment, with high measurement accuracy and improved measurement repeatability; manual operation is reduced, human errors are reduced, and measurement efficiency is improved; through simple modification of the configuration, the equipment can be applied to other types of products, greatly reducing production costs.

Claims

1. A method for measuring the centroid of a rotating composite blade, characterized in that: Methods include: Step 1: Calculate the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane; Step 2: Calculate the spanwise center of mass of the composite blade based on the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane; Step 3: Calculate the spanwise static moment of the composite blade based on the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane; Step 4: Calculate the chord-wise center of mass of the composite blade based on the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane.

2. The method according to claim 1, characterized in that Step 1 includes: Using the formula Calculate the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O, where α is the clockwise rotation angle of the blade around the Z axis, ΔT X is the change value of the unbalanced torque of the X-axis sensor, is the measurement input value, k X is a constant coefficient of the X-axis sensor after equipment calibration, ΔT Y is the change value of the unbalanced torque of the Y-axis sensor, is the measured input value, k Y A constant coefficient for the Y-axis sensor after device calibration.

3. The method according to claim 1, characterized in that Step 2 includes: Step 21: Obtain the difference x1 between the spanwise position of the bushing pin of the blade center of mass measuring device and the rotation axis; Step 22: Obtain the difference x2 between the spanwise position of the bushing pin of the blade mass center measuring device and the rotor rotation center; Step 23: Use the formula x+x1+x2 to calculate the spanwise center of mass of the composite blade, where x is the X-axis coordinate of the center of mass C in the XY plane.

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

5. The method according to claim 1, characterized in that Step 4 includes: Step 41: Obtain the difference y1 between the leading edge stopper of the profiling block of the blade mass center measuring device and the chord position (Y axis) of the rotating shaft; Step 42: Calculate the chord-wise center of mass of the composite blade using the formula y+y1, where y is the Y-axis coordinate of the center of mass C in the XY plane.

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

7. A rotating composite blade mass center 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: A relative position calculation unit, used to calculate the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane; A spanwise centroid calculation unit, used to calculate the spanwise centroid of the composite blade according to the relative position of the centroid C(x, y) relative to the zero point O in the XY plane; A spanwise static moment calculation unit, used to calculate the spanwise static moment of the composite blade according to the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane; The chord-wise center of mass calculation unit is used to calculate the chord-wise center of mass of the composite blade according to the relative position of the center of mass C(x, y) relative to the zero point O in the XY plane.

8. The device according to claim 7, characterized in that The relative position calculation unit is specifically used for: Using the formula Calculate the relative position of the center of mass C(x, y) in the XY plane relative to the zero point O, where α is the clockwise rotation angle of the blade around the Z axis, ΔT X is the change value of the unbalanced torque of the X-axis sensor, is the measurement input value, k X is a constant coefficient of the X-axis sensor after equipment calibration, ΔT Y is the change value of the unbalanced torque of the Y-axis sensor, is the measured input value, k Y A constant coefficient for the Y-axis sensor after device calibration.

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