Device and method for fine measurement of deformation field of composite propeller blade

Abstract

The application provides a device and method for fine measurement of a composite propeller blade deformation field. The device comprises an adjustable height horizontal control console, a horizontal plate, a blade loading point fixing device, a plurality of adjustable length displacement calibration probes, an electronic vernier caliper and a base device, and the like. The measurement method provided by the application realizes fine measurement of the blade deformation field of a composite propeller, can accurately, stably, efficiently and at low cost measure the small deformation amplitude of the composite propeller, thereby providing accurate test data support for simulation calculation, and can be applied to deformation measurement of composite propellers of different types and different scales.

Description

Technical Field

[0001] This invention relates to the field of measurement technology for ship composite material propellers, and in particular to a device and method for precisely measuring the deformation field of composite material propeller blades. Background Technology

[0002] Composite material propellers are propulsion devices made from reinforcing fibers, resin matrices, and / or sandwich materials. They exhibit significant adaptive hydroelastic properties, and through proper design, their bending-torsional coupling deformation can be utilized to reduce thrust pulsation, thereby improving hydrodynamic performance and reducing low-frequency vibration noise. The fabrication of composite material propeller blades typically employs methods such as RTM (Real-Time Molding) and molding. However, the process involves many uncontrollable factors. Even when preparing specimens and measuring material parameters after molding, complex geometric issues such as varying thickness and bending-torsional deformation mean that the material parameters of the composite material propeller blades cannot be directly derived from the specimen's modulus test results. A two-way calibration based on deformation measurements is necessary. Therefore, accurately measuring the loaded deformation of composite material propeller blades, especially the deformation field characteristics reflected by multi-point deformation, is fundamental to determining whether they meet design requirements.

[0003] The deformation of composite propeller blades is three-dimensional and complex, which can be decomposed into longitudinal deformation along the axial direction, pitch deformation along the torsional direction, and lateral deformation along the tangential direction of the disk surface. Measuring the deformation at multiple radii and chord lengths of the blade is an experimental goal that researchers have been relentlessly pursuing. Based on this, the shape parameter deformation of the blade can be parametrically inverted, thereby analyzing the changes in hydrodynamic performance of the propeller caused by the deformation field. This is crucial for the performance study of elastic blades.

[0004] Currently, the deformation field measurement of composite propeller blades is achieved by comparing the spatial positions of the blades before and after loading. Measurement methods include mechanical displacement gauges, handheld laser displacement gauges, and 3D laser scanners. However, due to the complex three-dimensional curved surface structure of propellers, these methods are easily limited by many unstable factors such as site conditions, the number of measurement points, inconsistent reference point positions, and high equipment costs, resulting in the inability to accurately capture the millimeter-level deformation amplitude of composite propellers. Specific problems are as follows:

[0005] (1) Mechanical displacement gauge measurement method: a three-axis rotating arm is used to position the measuring point, but the number of measuring points is limited due to the mutual interference of the rotating arms, and the needle tip will slide during large deformation, making it difficult to reset. In addition, it is also difficult to manually control the vertical direction of the earth.

[0006] (2) Handheld laser displacement meter measurement method: It measures distance by laser linear reflection. However, the spatial position of the measuring point changes before and after the blade is bent and twisted. Since the laser rangefinder needs to be fixed at a remote end, it is difficult to measure the spatial displacement of the same point based on a fixed reference direction.

[0007] (3) 3D laser scanner measurement method: It uses reflective sheets attached to the base plate to locate the planar reference, and attaches reflective sheets to the blade to locate the spatial shape, and then scans to form the three-dimensional surface of the blade. However, the scanned file only shows curved surfaces and does not contain points and lines. Multiple points need to be selected by eye for ghosting positioning, which results in a large error.

[0008] In summary, the challenges in measuring the deformation of small-scale composite propeller blades can be attributed to their small size, small deformation, numerous measuring points, and high precision requirements. Even minor disturbances in the measuring instruments can severely affect the accuracy of the test results.

[0009] In view of this, it is necessary to design an improved and more precise device and method for measuring the deformation field of composite propeller blades in order to solve the above problems. Summary of the Invention

[0010] To overcome the above-mentioned defects, the present invention aims to provide a device and method for finely measuring the deformation field of composite material propeller blades, thereby enabling precise measurement of the deformation field of composite material propeller blades. This method can accurately, stably, efficiently, and cost-effectively measure the minute deformation amplitude of composite material propellers, thus providing accurate experimental data support for simulation calculations. Furthermore, it is applicable to the deformation measurement of composite material propellers of different models and sizes.

[0011] To achieve the above-mentioned objectives, the present invention provides a device for precisely measuring the deformation field of composite material propeller blades, comprising:

[0012] An adjustable-height horizontal control console is positioned below the propeller blade to be measured;

[0013] Several adjustable-length displacement calibration probes are fixed at their upper ends to designated measuring points on the surface of the propeller blades to measure the deformation at specific locations on the propeller blades.

[0014] A horizontal plate, positioned above the horizontal control console, is used to adjust the lower end of the displacement calibration probe fixed to the surface of the propeller blade to the same horizontal plane.

[0015] A blade loading point fixing device is used to apply a concentrated load to a specified position on the propeller blade.

[0016] An electronic vernier caliper and base device are used to read the axial coordinates of the lower ends of several displacement calibration probes before and after the propeller blades are loaded by the blade loading point fixing device.

[0017] As a further improvement of the present invention, the blade loading point fixing device includes a fixing part, a loading weight, and a rigid support rope for connecting the fixing part and the loading weight.

[0018] As a further improvement of the present invention, the fixing part includes a "C"-shaped fixing member and a threaded rod rotatably connected to the "C"-shaped fixing member and used to adjust the degree of contact with the propeller blade;

[0019] The threaded rotor and the propeller blades use a spherical point contact method; the contact point is vertically connected to the rigid support rope below.

[0020] As a further improvement of the present invention, the displacement calibration probe consists of a connector fixedly connected to the propeller blade, a length adjustment device, and a probe.

[0021] As a further improvement of the present invention, two mutually perpendicular levels are installed on the upper surface of the horizontal control platform; a circular hole of a predetermined diameter is passed through the surface of the horizontal control platform.

[0022] As a further improvement of the present invention, the leveling plate includes a transparent glass plate and a support for adjusting the height of the transparent glass plate, and the leveling state is adjusted by an external level.

[0023] The transparent glass plate is provided with a horizontal through hole that is perpendicular to the circular hole.

[0024] As a further improvement of the present invention, the electronic vernier caliper and base device adopts a fastened assembly structure, including an electronic vernier caliper and a horizontal base.

[0025] To achieve the above-mentioned objectives, this invention also provides a method for precisely measuring the deformation field of composite material propeller blades. The method employs the aforementioned apparatus for precisely measuring the deformation field of composite material propeller blades, and the measurement steps are as follows:

[0026] S1. Before measuring the propeller blades, fix several adjustable-length displacement calibration probes at designated measuring points on the surface of the propeller blades. Propeller blade deformation is usually measured with the axial direction as the reference direction, while the axial direction is kept perpendicular.

[0027] S2, after fixing the propeller blades according to the above direction, arrange an adjustable height horizontal control platform below the propeller blades, and adjust the probe at the lower end of the displacement calibration probe fixed on the surface of the propeller blades to the same horizontal plane through the horizontal plate on the horizontal control platform.

[0028] S3 adopts a centralized loading mode, connecting the blade loading point fixing device to the propeller blade for loading;

[0029] S4, reads the axial coordinates of the probe at several measuring points before and after loading using an electronic vernier caliper and base device;

[0030] S5. After obtaining the accurate deformation data of each measuring point, the accurate deformation field parameters of the propeller blade are derived, thereby realizing the refined measurement of the deformation field of the composite material propeller blade.

[0031] As a further improvement of the present invention, the lower section of the blade loading point fixing device is a support structure. In step S3, the equivalent loading of 0.5kg to 50kg is achieved by adjusting the number of loading weights.

[0032] As a further improvement of the present invention, in step S1, 20 to 50 measuring points are evenly arranged according to the measurement scale to cover the characteristic points of the guide edge at different propeller blade radii.

[0033] As a further improvement of the present invention, in step S5, after obtaining the precise deformation data of each measuring point, 0.0, 0.5, and 1.0B values ​​are selected at each radius. r The deformation value at each radius can be further analyzed using the following formula, which relates to the pitch ratio variation at each radius and the deflection curve at each point along the chord length:

[0034] S51, Pitch Ratio Inverse Formula:

[0035] (1)

[0036] In formula (1), P r Where is the pitch, D is the diameter, R is the radius, r is the selected radius, r / R represents the relative radius, and X1 is the edge monitoring point (0.0 B). r X coordinates in the X direction, X2 is the guide edge monitoring point (1.0B) r X-axis coordinate, B r Let r be the chord length at radius r;

[0037] Among them, P r / D represents the pitch ratio at radius r, and r / R represents the relative radius. arcsin The function represents finding the angle given a value;

[0038] S52, Deflection Change Formula:

[0039] (2)

[0040] In formula (2), deflection y B Let r be the change in the X direction at the monitoring point at radius r, therefore y B The deformation in the X direction at the monitoring point can be read directly, i.e. ;q For a uniformly distributed load, B r Let r be the chord length at radius r. E For elastic modulus, I It is the moment of inertia;

[0041] By reading the values ​​at different radii of 0.0, 0.5, and 1.0B r Deformation amount △X 0.0 , △X 0.5 , △X 1.0 This allows us to summarize and analyze the deflection curves at various points along the chord, showing the relationship between deformation and radius.

[0042] The beneficial effects of this invention are:

[0043] 1. The device for precisely measuring the deformation field of composite material propeller blades provided by this invention is detachable and movable, making measurement convenient and quick.

[0044] 2. The device for finely measuring the deformation field of composite propeller blades provided by the present invention allows for the dense arrangement of measuring probes, with initial horizontal alignment. After the blade is loaded and deformed, the bending and twisting trend of the blade can be roughly observed through the vertical displacement of each probe, thus initially forming a deformation cloud map.

[0045] 3. The device for precisely measuring the deformation field of composite material propeller blades provided by this invention has an accurate electronic vernier caliper reading with a precision of 0.01 mm.

[0046] 4. The device for finely measuring the deformation field of composite propeller blades provided by this invention ensures that the vertical displacement measured by the probe after deformation is still at the original measuring point, thus guaranteeing the consistency of the measuring point.

[0047] 5. The method for precisely measuring the deformation field of composite propeller blades provided by this invention can accurately, stably, efficiently, and cost-effectively measure the minute deformation amplitude of composite propellers, thereby providing accurate experimental data support for simulation calculations, and can be applied to the deformation measurement of composite propellers of different models and sizes. Attached Figure Description

[0048] Figure 1 A schematic diagram of the device for precisely measuring the deformation field of composite material propeller blades provided by the present invention.

[0049] Figure 2 A schematic diagram of a horizontal control console for the device provided by the present invention for precisely measuring the deformation field of composite material propeller blades.

[0050] Figure 3 A schematic diagram of a horizontal plate for the device for precisely measuring the deformation field of composite propeller blades provided by the present invention.

[0051] Figure 4A schematic diagram of the blade loading point fixing device for the device for finely measuring the deformation field of composite propeller blades provided by the present invention.

[0052] Figure 5 A schematic diagram of the displacement calibration probe of the device for finely measuring the deformation field of composite propeller blades provided by the present invention.

[0053] Figure 6 A schematic diagram of the displacement calibration probe of the device for finely measuring the deformation field of composite propeller blades provided by the present invention.

[0054] Figure 7 A schematic diagram of the electronic vernier caliper and base device for the device for finely measuring the deformation field of composite propeller blades provided by the present invention.

[0055] Figure Labels

[0056] 1-Horizontal control console; 11-Level instrument; 12-Round hole; 2-Level plate; 21-Transparent glass plate; 22-Support part; 3-Paddle loading point fixing device; 31-Fixing part; 32-Rigid support rope; 33-Loading weight; 4-Displacement calibration probe; 41-Connector; 42-Length adjustment device; 43-Probe; 5-Electronic vernier caliper and base device; 51-Electronic vernier caliper; 52-Horizontal base. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0059] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Please see Figure 1As shown, this invention provides a device for precisely measuring the deformation field of composite material propeller blades. It includes an adjustable-height horizontal control platform 1, a horizontal plate 2, a blade loading point fixing device 3, several adjustable-length displacement calibration probes 4, an electronic vernier caliper, and a base device 5. The horizontal plate 2, the electronic vernier caliper, and the base device 5 are all placed on the adjustable-height horizontal control platform 1. The blade loading point fixing device 3 is used to apply a concentrated load at a specified location. The adjustable-length displacement calibration probes 4 are used to measure the deformation at specific locations on the blade. The more probes there are, the better they reflect the characteristics of the deformation field, and thus the shape deformation parameters of the composite material propeller can be derived.

[0061] Please see Figure 2 As shown, the horizontal control platform 1 is arranged below the propeller blade to be measured; two mutually perpendicular levels 11 are mounted on the upper surface of the horizontal control platform 1; a circular hole 12 of a predetermined diameter passes through the surface of the horizontal control platform 1. The height-adjustable horizontal control platform 1 is supported by four legs, and the height of each leg can be adjusted independently.

[0062] In one embodiment of the present invention, the height-adjustable horizontal control platform 1 is 1200mm long and 800mm wide, with a height adjustment range of 600mm-1000mm. The platform surface is a rectangle of 1200mm × 800mm, and a through circular hole 12 with a diameter of 30mm is opened in the center of the platform surface. After fixing the propeller blade, the control platform 1 is moved to a position below the propeller blade, so that the circular hole 12 on the platform surface is approximately at the same vertical line position as the loading point, and the platform surface is adjusted to be horizontal by using an external level.

[0063] Please see Figure 3 As shown, a horizontal plate 2 is positioned above the horizontal control console 1 to adjust the lower end of the displacement calibration probe 4, which is fixed to the surface of the propeller blade, to the same horizontal plane. The horizontal plate 2 includes a transparent glass plate 21 and a support part 22 for adjusting the height of the transparent glass plate 21, and the horizontal state is adjusted by an external level; the transparent glass plate 21 is provided with a horizontal through hole that is perpendicular to the circular hole 12.

[0064] In one embodiment of the present invention, the horizontal plate 2 is a square transparent glass plate of 400mm×400mm, supported by adjustable-length aluminum alloy pillars at the four corners; and the whole is placed on the adjustable-height horizontal control platform 1, and its horizontal state is adjusted by an external level; so as to align the pendant probe 43 with the same horizontal plane. After adjustment, the vertical distance between the tip of the probe 43 and the plane of the control platform is measured by an electronic vernier caliper 51.

[0065] Please see Figure 4As shown, the blade loading point fixing device 3 is used to apply a concentrated load to a specified position on the propeller blade; the blade loading point fixing device 3 includes a fixing part 31, a loading weight 33, and a rigid support rope 32 for connecting the fixing part 31 and the loading weight 33.

[0066] The fixing part 31 includes a "C"-shaped fixing member and a threaded screw rod that is rotatably connected to the "C"-shaped fixing member and is used to adjust the degree of contact with the propeller blade.

[0067] The threaded rod and the propeller blade adopt a spherical point contact method; the rigid support rope 32 is connected vertically below the contact point to support the loading weight. At the same time, the design of the loading point should avoid generating additional torque to facilitate accurate comparison with simulation calculations.

[0068] In one embodiment of the present invention, after calibrating the equivalent concentrated loading point position according to design requirements, the blade loading point fixing device 3 is fixed. This device makes point contact with the blade surface to reduce the impact of the fastening joint on the bending and torsional deformation of the curved blade. The lower section of the blade loading point fixing device 3 is a support structure, allowing for equivalent loading from 0.5 kg to 50 kg by adjusting the number of loading weights. The blade fastening end and the support structure are connected by a rigid material to ensure that no instantaneous acceleration occurs at the connection point during loading.

[0069] Please see Figure 5 As shown, several adjustable-length displacement calibration probes 4 are fixed at their upper ends to designated measuring points on the surface of the propeller blade to measure the deformation at specific locations on the propeller blade.

[0070] The displacement calibration probe 4 consists of a connector 41 fixedly connected to the propeller blade, a length adjustment device 42, and a probe 43. The length adjustment device 42 includes a rotating structure and a fiber thread. The connector 41 is used to fix the displacement calibration probe 4 to the surface of the propeller blade, the rotating structure is used to adjust the length of the fiber thread and ensure that the fiber thread is vertical and does not deform, and the coarse-tipped probe 43 is used for observation and measurement.

[0071] In one embodiment of the present invention, the connector 41 is connected to the blade using an adhesive method to reduce the impact on blade deformation; please refer to Figure 6 As shown, the length adjustment device 42 adopts a rotating shaft structure to adjust the length. The key point is that the two ends of the device must be on the same vertical straight line. 20 to 50 measurement points are evenly arranged according to the measurement scale to cover the characteristic points of the guide edge at different radii.

[0072] Please see Figure 7 As shown, the electronic vernier caliper and base device 5 are used to read the axial coordinates of the lower ends of several displacement calibration probes 4 before and after the propeller blade passes through the blade loading point fixing device 3.

[0073] The electronic vernier caliper and base device 5 adopts a fastened assembly structure, including an electronic vernier caliper 51 and a horizontal base 52. During use, the electronic vernier caliper 51 is inserted into the horizontal base 52 and tightened to ensure that the vernier caliper is always on the horizontal plane of the control panel. After loading, the probes 43, initially on the same horizontal plane, will exhibit different vertical displacements, roughly showing the deformation cloud pattern trend of the composite material propeller. Simultaneously, the vertical coordinates of each probe are measured again using the electronic vernier caliper 51, thereby obtaining accurate deformation field data.

[0074] Example 1

[0075] This invention provides a method for finely measuring the deformation field of composite material propeller blades. The method employs the aforementioned apparatus for finely measuring the deformation field of composite material propeller blades, and the measurement steps are as follows:

[0076] S1. Before measuring the propeller blades, several adjustable-length displacement calibration probes 4 are fixed at designated measuring points on the surface of the propeller blades. Propeller blade deformation is usually measured with the axial direction as the reference direction, and the axial direction is kept perpendicular. 20 to 50 measuring points are evenly arranged according to the measurement scale to cover the characteristic points of the guide edge at different propeller blade radii. The connector 41 of the displacement calibration probe 4 is connected to the blades by adhesive to reduce the influence on blade deformation. The length adjustment device 42 uses a rotating shaft structure to adjust the length. The key point is that the two ends of the device must be on the same vertical straight line.

[0077] S2, after fixing the propeller blades according to the above direction, an adjustable horizontal control platform 1 is arranged below the propeller blades. The probe 43 at the lower end of the displacement calibration probe 4 fixed on the surface of the propeller blades is adjusted to the same horizontal plane by the horizontal plate 2 on the horizontal control platform 1.

[0078] S3 adopts a centralized loading mode, connecting the blade loading point fixing device 3 to the propeller blade, and adjusting the number of loading weights to achieve an equivalent loading of 0.5kg to 50kg.

[0079] S4, the axial coordinates of the probes at several measuring points before and after loading are read by electronic vernier calipers and base device; after loading, the probes that are initially on the same horizontal plane will show different vertical displacements, which can roughly show the deformation cloud map trend of the composite propeller blade; at the same time, the vertical coordinates of each probe are measured again by electronic vernier calipers 51, so as to obtain accurate deformation field data.

[0080] S5. After obtaining the accurate deformation data of each measuring point, the accurate deformation field parameters of the propeller blade are derived, thereby realizing the refined measurement of the deformation field of the composite material propeller blade.

[0081] In step S5, after obtaining the precise deformation data for each measuring point, select 0.0, 0.5, and 1.0B at each radius. r The deformation value at (blade chord length at radius r) can be used to further analyze the pitch ratio change at each radius and the deflection curve at each point of the chord length, based on the following formula:

[0082] S51, Pitch Ratio Inverse Formula:

[0083] (1)

[0084] In formula (1), P r Where is the pitch, D is the diameter, R is the radius, r is the selected radius, r / R represents the relative radius, and X1 is the edge monitoring point (0.0 B). r X coordinates in the X direction, X2 is the guide edge monitoring point (1.0B) r X-axis coordinate, B r Let r be the chord length at radius r;

[0085] Among them, P r / D represents the pitch ratio at radius r, and r / R represents the relative radius. arcsin The function represents finding the angle given a value;

[0086] S52, Deflection Change Formula:

[0087] (2)

[0088] In formula (2), deflection y B Let r be the change in the X direction at the monitoring point at radius r, therefore y B The deformation in the X direction at the monitoring point can be read directly, i.e. ; q For a uniformly distributed load, B r Let r be the chord length at radius r. E For elastic modulus, I It is the moment of inertia;

[0089] By reading the values ​​at different radii of 0.0, 0.5, and 1.0B r The deformation ΔX of (blade chord length at radius r) 0.0 , △X 0.5 , △X 1.0 This allows us to summarize and analyze the deflection curves at various points along the chord, showing the relationship between deformation and radius.

[0090] In summary, this invention provides a device and method for precisely measuring the deformation field of composite material propeller blades. The device includes an adjustable-height horizontal control platform 1, a horizontal plate 2, a blade loading point fixing device 3, several adjustable-length displacement calibration probes 4, an electronic vernier caliper, and a base device 5. The measurement method provided by this invention enables precise measurement of the deformation field of composite material propeller blades, accurately, stably, efficiently, and cost-effectively measuring the minute deformation amplitudes of composite material propellers. This provides accurate experimental data support for simulation calculations and is applicable to the deformation measurement of composite material propellers of different models and sizes.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for precisely measuring the deformation field of composite material propeller blades, characterized in that: The device for precisely measuring the deformation field of composite material propeller blades includes: An adjustable-height horizontal control console (1) is positioned below the propeller blade to be measured; Several adjustable displacement calibration probes (4) are fixed at their upper ends to designated measuring points on the surface of the propeller blades to measure the deformation at specific locations on the propeller blades. A horizontal plate (2) is set above the horizontal control console (1) to adjust the lower end of the displacement calibration probe (4) fixed on the surface of the propeller blade to the same horizontal plane; The blade loading point fixing device (3) is used to apply concentrated loads to the propeller blades at specified locations. Electronic vernier caliper and base device (5) are used to read the axial coordinates of the lower ends of several displacement calibration probes (4) before and after the propeller blade passes through the blade loading point fixing device (3). The blade loading point fixing device (3) includes a fixing part (31), a loading weight (33), and a rigid support rope (32) for connecting the fixing part (31) and the loading weight (33). The fixing part (31) includes a "C"-shaped fixing member and a threaded rod rotatably connected to the "C"-shaped fixing member and used to adjust the degree of contact with the propeller blade; The threaded rotor and the propeller blades adopt a spherical point contact method; the contact point is vertically connected to the rigid support rope (32).

2. The apparatus for precisely measuring the deformation field of composite material propeller blades according to claim 1, characterized in that: The displacement calibration probe (4) consists of a connector (41) fixedly connected to the propeller blade, a length adjustment device (42), and a probe (43).

3. The apparatus for precisely measuring the deformation field of composite material propeller blades according to claim 1, characterized in that: Two mutually perpendicular levels (11) are installed on the upper surface of the horizontal control platform (1); a circular hole (12) of a predetermined diameter is passed through the surface of the horizontal control platform (1).

4. The apparatus for precisely measuring the deformation field of composite material propeller blades according to claim 3, characterized in that: The level plate (2) includes a transparent glass plate (21) and a support (22) for adjusting the height of the transparent glass plate (21), and the level is adjusted by an external level. The transparent glass plate (21) is provided with a horizontal through hole that is perpendicular to the circular hole (12).

5. The apparatus for precisely measuring the deformation field of composite material propeller blades according to claim 1, characterized in that: The electronic vernier caliper and base device (5) adopts a fastened assembly structure, including an electronic vernier caliper (51) and a horizontal base (52).

6. A method for precisely measuring the deformation field of composite material propeller blades, characterized in that: The device for fine measurement of the deformation field of composite propeller blades as described in any one of claims 1 to 5 is used for fine measurement. The measurement steps are as follows: S1, Before measuring the propeller blade, fix several adjustable displacement calibration probes (4) at designated measuring points on the surface of the propeller blade; the propeller blade deformation measurement takes the axial direction as the reference direction, while the axial direction remains perpendicular. S2, after fixing the propeller blades according to the above direction, an adjustable height horizontal control platform (1) is arranged below the propeller blades. The probe (43) at the lower end of the displacement calibration probe (4) fixed on the surface of the propeller blades is adjusted to the same horizontal plane by the horizontal plate (2) on the horizontal control platform (1). S3, adopting a centralized loading mode, connects the blade loading point fixing device (3) to the propeller blade for loading; S4, read the axial coordinates of the probe (43) at several measuring points before and after loading by using an electronic vernier caliper and base device (5); S5. After obtaining the precise deformation data of each measuring point, the accurate deformation field parameters of the propeller blade are derived, thereby realizing the refined measurement of the deformation field of the composite material propeller blade.

7. The method for precise measurement of the deformation field of composite material propeller blades according to claim 6, characterized in that: The lower section of the blade loading point fixing device (3) is a support structure. In step S3, the equivalent loading of 0.5kg to 50kg is achieved by adjusting the number of loading weights (33). In step S1, 20 to 50 measuring points are evenly arranged according to the measurement scale to cover the characteristic points of the guide edge at different propeller blade radii.

8. The method for precise measurement of the deformation field of composite material propeller blades according to claim 6, characterized in that: In step S5, after obtaining the precise deformation data for each measuring point, select 0.0, 0.5, and 1.0B at each radius. r Based on the following formula, further analysis is conducted on the pitch ratio variation at each radius and the deflection curves at each point along the chord length, considering the deformation values ​​at each point: S51, Pitch Ratio Inverse Formula: （1） In formula (1), P r Where is the pitch, D is the diameter, R is the radius, r is the selected radius, r / R represents the relative radius, and X1 is the edge monitoring point 0.0 B. r X1 is the X-axis coordinate, and X2 is the guide edge monitoring point 1.0B. r The X-axis coordinate, B r Let r be the chord length at radius r; Among them, P r / D represents the pitch ratio at radius r, and r / R represents the relative radius. arcsin The function represents finding the angle given a value; S52, Deflection Change Formula: （2） In formula (2), deflection y B Let r be the change in the X direction at the monitoring point at radius r, therefore y B The deformation in the X direction at the monitoring point is read directly, i.e. ; q For a uniformly distributed load, B r Let r be the chord length at radius r. E For elastic modulus, I It is the moment of inertia; By reading the values ​​at different radii of 0.0, 0.5, and 1.0B r Deformation amount △X 0.0 , △X 0.5 , △X 1.0 The deflection curves of deformation at various points along the chord direction with respect to the radius were summarized and analyzed.

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