CN108195539B

CN108195539B - A test device for studying helicopter paddle lifts tenesmus

Info

Publication number: CN108195539B
Application number: CN201711135565.0A
Authority: CN
Inventors: 张英杰; 韩东; 吴世杰
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2017-11-13
Filing date: 2017-11-13
Publication date: 2019-12-06
Anticipated expiration: 2037-11-13
Also published as: CN108195539A

Abstract

The embodiment of the invention discloses a test device for researching the lifting and falling of a helicopter blade, relates to the technical field of helicopters, and can be used for researching the influence of contact collision between limiting blocks on the dynamic response of the blade in the lifting and falling process of the blade. The invention comprises the following steps: the model paddle comprises a model paddle, a clamping device, a support, an impact block, a workbench, a base, a hanging bracket and a sensor, wherein the model paddle and the clamping device are connected through bolts, the clamping device and a fixed shaft are supported through a bearing, the clamping device provided with the model paddle can rotate around a shaft, the fixed shaft is fixed on the support, and the shaft and the support are in interference fit. The support and the support are welded on the workbench in pairs, the tail of the hanging bracket is connected with the support through a fixed shaft, the hanging bracket is connected with the support through a pin, the model blade is lifted by a rope at the end of the hanging bracket to be at an initial position, the model blade is dropped from the initial position, and the upper collision block and the lower collision block can be in contact collision.

Description

A test device for studying helicopter paddle lifts tenesmus

Technical Field

The invention relates to the technical field of helicopters, in particular to a test device for researching the lifting and falling of a helicopter blade.

Background

Helicopter rotors are often susceptible to interference from external environments during operation, such as when encountering relatively complex and variable sea conditions, which can affect the starting and stopping of the helicopter rotors. In the starting and stopping processes of the rotor helicopter, the rotor can pass through a low rotating speed area, the rigidity of centrifugal force generated by rotation of the blades around the main shaft is relatively low, and the blade tips can generate overlarge displacement and collide with the helicopter body. In the process, the blade and the stop block can generate stronger impact collision, and the dynamic response of the blade is influenced.

Because the paddle can continuously collide with the stop block in the process of lifting and falling, larger impact load is generated, and certain influence on the strength and the service life of the paddle can be caused. Therefore, the influence of the contact collision between the stopper blocks on the dynamic response of the blade in the lifting and falling process of the blade needs to be researched.

Disclosure of Invention

The embodiment of the invention provides a test device for researching the lifting and falling of a helicopter blade, which can be used for researching the influence of contact collision between limiting blocks on the dynamic response of the blade in the lifting and falling process of the blade.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

the test device in this embodiment includes model paddle, clamping device, support, impact piece, workstation, base, gallows, sensor, adopts bolted connection between model paddle and the clamping device, adopts the bearing to support between clamping device and the dead axle, makes the clamping device who is equipped with the model paddle can pivoting, and the dead axle is fixed in the support, adopts interference fit between axle and the support. The support and the support are welded on the workbench in pairs, the tail of the hanging bracket is connected with the support through the fixed shaft, the hanging bracket is connected with the support through the pin, the model blade is lifted by the rope at the end of the hanging bracket to be in the initial position, or the electromagnet is fixedly installed on the hanging bracket and the clamping device respectively, the model blade is dropped from the initial position through power-on and power-off, the upper collision block and the lower collision block can be in contact collision, and the dynamic problem in the collision process can be researched.

The working principle of the test device in this embodiment lies in: the model paddle is placed from the initial position, after the paddle falls to a certain position, the upper and lower collision blocks can continuously collide to generate impact load, and the displacement of the paddle tip of the paddle can be overlarge. In the process, the displacement and acceleration of the tip of the blade, the strain of different parts of the blade, the flap angle and the impact load are measured. Therefore, the impact load when the model paddle falls down is effectively measured, and the impact load is measured by adopting a force sensor or a strain type force measuring method.

drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a testing apparatus provided in an embodiment of the present invention (when a blade drops, a point-to-point collision occurs);

FIG. 2 is a schematic structural diagram of another testing apparatus provided in the embodiment of the present invention (when a blade falls, it collides with another blade in a face-to-face manner);

FIG. 3 is a schematic structural view of another testing apparatus provided by an embodiment of the present invention (face-to-face collision when a blade is dropped);

FIG. 4 is a schematic diagram of a testing apparatus using an electromagnet as an initial position fixing according to an embodiment of the present invention;

fig. 5 is a schematic view of a force sensor installation provided in an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The embodiment of the invention provides a test device for researching the lifting and falling of a helicopter blade, which comprises the following components as shown in figure 1:

the device comprises a model blade (1), a clamping device (2), a support (3), an upper impact block (4), a lower impact block (5), a workbench (6), a base (7), a support (8), a support (9), a first hanger (10), a first fixed shaft (11), a first screw (12), a bolt (13), a nut (14), a gasket (15), a first screw (16), a second screw (17), a third screw (18), a fourth screw (19), a second fixed shaft (20), a pin (21), a rolling bearing (22), a clamping piece (23), a lower square impact block (24), an upper square impact block (25), an inclination angle sensor (26), a resistance strain piece (27), an acceleration sensor (28) and a pressure sensor (32).

The model paddle (1) is connected with the first fixed shaft (11) through the clamping device (2), the clamping device (2) and the first fixed shaft (11) are supported by the rolling bearing (22), and the model paddle (1) can rotate around the first fixed shaft (11) to simulate the lifting and falling of the model paddle (1).

The upper impact block (4) is mounted on the clamping device (2) by a first screw (16).

The lower impact mass (5) is mounted on the base (7) by second screws (17), and the upper impact mass (4) and the lower impact mass (5) are aligned point-to-point or aligned face-to-face.

The first hanging bracket (10) is connected with the support (8) through the second dead axle (20), the first hanging bracket (10) is connected with the support piece (9) through the pin (21), and holes with different heights are formed in the support piece (9), so that the first hanging bracket (10) can be installed at different angles conveniently.

the acceleration sensor (28) is installed at the tip of the model blade (1).

The tilt sensor (26) is mounted on the clamping device (2) and is used for positioning an initial position and measuring a waving angle.

In the initial position, the end of the first hanger (10) is connected with a first screw (12) on the clamping device (2) by a rope to lift the model blade (1).

the workbench (6) and the base (7) are fixed by a third screw (18), and the workbench (6) and the base (7) are vertical to each other.

The working principle of the test device in this embodiment lies in: the model paddle (1) is placed from the initial position, after the paddle falls to a certain position, the upper and lower collision blocks can continuously collide to generate impact load, and the displacement of the tip of the paddle can be overlarge. In the process, the displacement and acceleration of the tip of the blade, the strain of different parts of the blade, the flap angle and the impact load are measured. Therefore, the impact load when the model paddle falls down is effectively measured, and the impact load is measured by adopting a force sensor or a strain type force measuring method.

specifically, the resistance strain gauges (27) are respectively attached to positions, 20%, 30% and 40% of the positions, away from the blade root, of the model blade (1) and are attached to positions, away from the bottom by 50%, of the lower impact block (5), wherein the resistance strain gauges (27) are connected with a wireless dynamic strain collector, and the wireless dynamic strain collector is used for collecting strain data.

In the actual measurement process, the strain gauges on the model blades are attached to the positions 20%, 30% and 40% away from the root of the blade respectively, the strain gauges on the collision blocks are attached to the positions 50% away from the bottom, and strain data are acquired through a wireless dynamic strain acquisition unit. The acceleration sensor is arranged at the oar tip and is arranged in a sticking mode, and signals of the acceleration sensor are collected and sorted through the adapter and the dynamic signal analyzer. And mounting the inclination angle sensor on the clamping device for positioning the initial position and measuring the waving angle.

Alternatively, as shown in fig. 1, both the lower end of the upper impact mass (4) and the upper end of the lower impact mass (5) are semicircular.

Alternatively, as shown in fig. 2, the lower end of the upper impact mass (4) is semicircular. The upper end of the lower collision block (5) is square.

alternatively, as shown in fig. 3, both the lower end of the upper impact mass (4) and the upper end of the lower impact mass (5) are square blocks.

In this embodiment, the square or semi-circular shape to achieve point-to-point (fig. 1), point-to-face (fig. 2), and face-to-face (fig. 3) collisions. When the collision is carried out, a certain gap is required to be left to prevent the collision between the collision blocks from occurring in advance.

In this embodiment, as shown in fig. 4, the method further includes: the electromagnetic chuck (29), a second screw (30) and a second hanger (31).

The electromagnetic chuck (29) is arranged on a second hanger (31), and the second hanger (31) is arranged on the workbench (6) by adopting a second screw (30).

in the initial position, the clamping device (2) is lifted using the electromagnetic chuck (29).

Further, a pressure sensor (32) is installed in the middle of the lower impact mass (5). For example: as shown in fig. 5, the impact load may also be measured by breaking the lower impact mass using force sensors that respectively connect and fix the broken two portions to measure the impact load.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a test device for studying helicopter blade lifts tenesmus which characterized in that includes: the device comprises a model blade (1), a clamping device (2), a support (3), an upper impact block (4), a lower impact block (5), a workbench (6), a base (7), a support (8), a support (9), a first hanger (10), a first fixed shaft (11), a first screw (12), a bolt (13), a nut (14), a gasket (15), a first screw (16), a second screw (17), a third screw (18), a fourth screw (19), a second fixed shaft (20), a pin (21), a rolling bearing (22), a clamping piece (23), a lower square impact block (24), an upper square impact block (25), an inclination angle sensor (26), a resistance strain piece (27), an acceleration sensor (28) and a pressure sensor (32);

the model paddle (1) is connected with the first fixed shaft (11) through the clamping device (2), and the clamping device (2) and the first fixed shaft (11) are supported by the rolling bearing (22), so that the model paddle (1) can rotate around the first fixed shaft (11) to simulate the lifting and falling of the model paddle (1);

the upper collision block (4) is arranged on the clamping device (2) by adopting a first screw (16);

The lower impact block (5) is arranged on the base (7) by adopting a second screw (17), and the upper impact block (4) and the lower impact block (5) are aligned point to point or aligned face to face;

The first hanging bracket (10) is connected with the support (8) through a second fixed shaft (20), the first hanging bracket (10) is connected with the support piece (9) through a pin (21), and holes with different heights are formed in the support piece (9) so that the first hanging bracket (10) can be installed at different angles conveniently;

The acceleration sensor (28) is arranged at the blade tip of the model blade (1);

The inclination angle sensor (26) is arranged on the clamping device (2) and used for positioning an initial position and measuring a waving angle;

In the initial position, the end part of the first hanger (10) is connected with a first screw (12) on the clamping device (2) by a rope to lift the model blade (1);

2. a test device for studying the uplift and drop of a helicopter blade according to claim 1, wherein the lower end of the upper impact mass (4) and the upper end of the lower impact mass (5) are both semicircular.

3. the test device for studying the uplift and the drop of the helicopter blade according to claim 1, wherein the lower end of the upper impact block (4) is semicircular;

the upper end of the lower collision block (5) is square.

4. a test device for studying the uplift and drop of a helicopter blade according to claim 1, wherein the lower end of the upper impact mass (4) and the upper end of the lower impact mass (5) are both square blocks.

5. A test device for studying helicopter blades lifting and dropping according to claim 1, further comprising: an electromagnetic chuck (29), a second screw (30) and a second hanger (31);

The electromagnetic chuck (29) is arranged on a second hanger (31), and the second hanger (31) is arranged on the workbench (6) by adopting a second screw (30);

6. Test device for studying the uplift and the drop-off of a helicopter blade according to claim 1, characterized in that the pressure sensor (32) is mounted in the middle of the lower impact mass (5).