WO2020042203A1

WO2020042203A1 - Fiber-reinforced composite thin-shell rotational vibration test stand considering uniformity and temperature gradient

Info

Publication number: WO2020042203A1
Application number: PCT/CN2018/103949
Authority: WO
Inventors: 李晖; 贾辰强; 李小彭; 陈曦; 高志辉; 于春喜; 王进; 闻邦椿
Original assignee: 东北大学
Priority date: 2018-08-28
Filing date: 2018-09-04
Publication date: 2020-03-05
Also published as: CN109029890B; CN109029890A

Abstract

A fiber-reinforced composite thin-shell rotational test stand considering uniformity and temperature gradient influences and under high-strength aerodynamic load excitation, relating to the field of vibration testing, and comprising an integral body structure, a fiber-reinforced composite thin-shell connecting structure at a rotating electrical machine, a connecting structure at a movable seat, an aerodynamic load excitation structure for the test stand, a heating pipe connecting seat, and a non-contact laser testing device. The present invention can realize non-contact high-strength aerodynamic load excitation and testing of a rotational fiber-reinforced composite thin-shell with regard to uniformity and temperature gradient influences.

Description

Rotary vibration test stand for fiber reinforced composite thin shell considering uniformity and temperature gradient

Technical field

The invention relates to the field of vibration testing, in particular to a fiber-reinforced composite thin-shell rotating test stand under the consideration of high-strength aerodynamic load under the influence of uniformity and temperature gradient.

Background technique

Compared with metal shells, fiber-reinforced composite shells have many characteristics such as light weight, high load pressure, good impact resistance, outstanding fatigue resistance, and good insulation properties. They are currently being increasingly used in aerospace, Ships, marine engineering, weapon manufacturing, and nuclear industries. In engineering practice, there are a large number of thin shell structural parts made of this type of materials, such as composite drums for aero engines, pressure-resistant composite cylindrical shells for deep-sea submersibles, and high-temperature-resistant composite shells used in the combustion chamber of liquid rocket engines. And so on, and as their structure becomes more and more complex, and their working environment becomes more and more severe, their vibration problems become more and more prominent.

At present, although there are some test benches that can test the rotational vibration of thin shells of metal and composite materials, but referring to related patents, there have not been disclosed thin shell rotational vibration test benches that can consider the effects of uniformity and temperature gradients. In addition, when it is rotating at a high speed, the existing excitation technology mostly uses a contact excitation method, and there is a great problem in the excitation effect, which further affects the accuracy of the vibration test. In view of the existing problems, it is imperative to develop a test bench for fiber reinforced composite thin shell rotational vibration testing that takes into account the effects of temperature and environment.

Summary of the Invention

In view of the existing technical problems, the present invention provides a fiber-reinforced composite thin-shell rotating test stand under the excitation of high-strength aerodynamic loads considering the effects of uniformity and temperature gradient. The position of the moving base is adjusted by a screw to install the fiber-reinforced composite thin-shell. On the mounting plate, the left end is fixed by the mounting plate, and then the position of the moving seat is adjusted by a screw, so that the right mounting plate contacts the fiber-reinforced composite thin shell, and the right side is fixed by the mounting plate. Rotary motor is used to accelerate the fiber-reinforced composite thin shell; by adjusting different parameters by controlling the lead screw motor, middle tube motor and heating tube motor, the air compressor is turned on to excite the fiber-reinforced composite thin shell.

The technical solution of the present invention is:

The fiber reinforced composite thin shell rotating test stand under the excitation of high-strength aerodynamic load considering the influence of uniformity and temperature gradient includes the integral fuselage structure, the fiber reinforced composite thin shell connection structure at the rotating electrical machine end, the connection structure at the moving base, and the aerodynamic load of the test bed Excitation structure, test bench aerodynamic load excitation structure and non-contact laser test equipment.

The integrated fuselage structure includes a fuselage, a mobile base, a mobile base screw, and a rotary electric machine; the two ends of the fuselage are a base structure, and a rotary motor and a mobile base are respectively installed, and the mobile base is installed on the machine The moving base screw on the body rotates to move.

The fiber reinforced composite thin shell connection structure of the rotary electric machine end includes a fiber reinforced composite thin shell, a rotary electric machine connecting plate, a left heating pipe mounting plate, and a left connecting socket of the heating pipe; a rotary electric machine connecting plate is mounted on the rotary electric machine, and the rotary electric machine There is a left-side heating tube mounting plate on one side of the connecting plate. The left-side connection seat of the heating tube is installed on the left-side heating tube mounting plate. The fiber-reinforced composite thin shell is connected to the left-side heating tube mounting plate through the fiber-reinforced composite thin-shell mounting plate. The fiber-reinforced composite thin-shell mounting plate and the left-side heating tube mounting plate are made of heat-insulating material.

The connection structure at the moving base body includes a base body shaft, a motor connecting cylinder, a right-side heating tube mounting plate, a right-side heating tube connecting base, a screw motor, an inner cylinder motor and a heating tube motor; the base shaft is installed on the moving base. On the body, a motor connecting cylinder is installed at one end of the shaft of the base body, and a heating tube mounting plate on the right side of the motor connecting tube is installed on the right side of the heating tube. The fiber reinforced composite shell is connected to the fiber reinforced composite shell. The thin-shell mounting plate is connected to the right-hand heating tube mounting plate, and the lead screw motor, the inner tube motor and the heating-tube motor are sequentially concentrically installed in the motor connecting tube; the fiber-reinforced composite thin-shell mounting plate and the right-side heating tube mounting plate are Thermal insulation material.

The aerodynamic load excitation structure of the test bench includes a middle cylinder, an inner cylinder, a spool, a spool screw, an air duct, and an air compressor; a middle cylinder is installed in the middle of the left heating tube mounting plate, and there are small holes in the middle cylinder. The other end of the middle tube can be inserted into the right-hand heating tube installation plate after the auxiliary material tube is installed; the inner tube is placed in the center of the middle tube and connected to the inner tube motor. The inner tube has the same small holes as the middle tube; The column is placed in the inner cylinder. The slider can be controlled and moved by the slider screw. The slider screw is installed on the screw motor. The air compressor is connected to the seat shaft through the air duct. The seat shaft and the motor connection cylinder are hollow. The gas enters the fiber-reinforced composite thin shell through the motor connection cylinder for excitation; the aerodynamic load excitation of the test bench is non-contact excitation, and the excitation position can be adjusted by controlling the opening and closing state of the small hole in the middle cylinder.

The fiber reinforced composite thin shell has flange structures at both ends for installation.

The fiber reinforced composite thin shell mounting plate has four pieces, and two pieces on each side are used for the installation of the fiber reinforced composite thin shell.

The heating pipe connection seat is divided into left and right sides, six on each side, and are installed in the left connection seat moving groove and the right connection seat moving groove on the left heating pipe mounting plate and the right heating pipe mounting plate; The left side of the tube is different from the right side of the heating tube. The right side of the heating tube has a long shaft at the end. The long shaft end is connected to the motor connection plate through the heating tube link. The motor connection plate is installed on the heating tube motor. The heating tube motor rotates, and the heating tube is controlled by the heating tube connecting rod, so that the heating tube connection seat is moved in the right connection seat moving groove and the left connection seat moving groove to realize the adjustment of the distance between the heating pipe and the fiber-reinforced composite thin shell.

The base body shaft is a hollow cylindrical end connected with an air compressor and an air duct, and the front end is connected with a motor connection disk.

The inner cylinder is placed in the middle cylinder, and the rotation of the inner cylinder can control the closing of the small holes in the middle cylinder; when the small holes of the inner cylinder and the inner cylinder are opened, the position of the aerodynamic load excitation can be controlled by the movement of the slide column; the slide column is an internal hollow cylinder, The central part is connected to the lead screw.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The test bed controls the distance between the heating tube and the fiber-reinforced composite thin shell through the connecting rod structure, thereby achieving temperature gradient control; the opening and closing of the small hole can be achieved through the cooperation of the middle tube and the inner tube, and the position of the slider can be adjusted to achieve the excitation position ; Rotate the motor to drive the fiber-reinforced composite shell for high-speed rotation. Both the temperature control and the excitation position adjustment are controlled by a motor, which facilitates automatic and precise control and makes the obtained experimental data more accurate. The test rig can realize the non-contact high-intensity aerodynamic load excitation of the rotating fiber reinforced composite thin shell under the influence of uniformity and temperature gradient.

The installation plate, the left-side heating pipe mounting plate, and the right-side heating pipe mounting plate of the invention are heat-insulating materials. After installation, the fiber-reinforced composite thin shell can be insulated to keep its temperature constant.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an oblique view of the test bench;

Figure 2 is a front view of the test stand;

Figure 3 is a plan view of the test stand;

Figure 4 is a sectional view of the test bench;

5 is a left side view of the test bench excitation mechanism after removing the fiber reinforced composite thin shell and the mounting plate;

Figure 6 is a right side view of the test bench excitation mechanism with the fiber reinforced composite shell removed and the mounting plate;

Figure 7 is a sectional view of the test bench excitation mechanism;

Figure 8 shows the test bench excitation mechanism with the fiber-reinforced composite thin shell removed, the mounting plate, the seat shaft, and the motor connecting cylinder;

Figure 9 is a structural diagram of the middle tube;

FIG. 10 is a structural diagram of a spool transmission.

In the picture: 1-body, 2-fiber-reinforced composite shell, 3-air compressor, 4- air duct, 5-mobile base screw, 6-mobile base, 7-base shaft, 8-motor Connection tube, 9-right heating tube mounting plate, 10-fiber reinforced composite shell mounting plate, 11-left heating tube mounting plate, 12-rotating motor connection plate, 13-rotating motor, 14- heating tube left connection Seat, 15-heating tube, 16-middle tube, 17-heating tube right connection seat, 18-right connection seat moving slot, 19-left connection seat moving slot, 20-spool screw, 21-screw Motor, 22-inner tube motor, 23-heating tube motor, 24-motor connection plate, 25-heating tube connecting rod, 26-inner tube, 27-spool.

detailed description

Figure 1 is an oblique view of the test rig, Figure 2 is a front view of the test rig, Figure 3 is a plan view of the test rig, Figure 4 is a cross-sectional view of the test rig, and Figure 5 is the left side of the test rig excitation mechanism with the fiber reinforced composite shell removed and the mounting plate Figure, Figure 6 is the right side view of the test bench excitation mechanism with the fiber reinforced composite shell removed and the mounting plate, Figure 7 is a sectional view of the test bench excitation mechanism, and Figure 8 is the test bench excitation mechanism with the fiber reinforced composite shell removed, the mounting plate, and the base. Shaft and motor connection cylinder, Figure 9 is the structure diagram of the middle cylinder, and Figure 10 is the structure diagram of the transmission of the spool, as shown in the figure:

The integrated fuselage structure includes a fuselage 1, a movable base 6, a movable base screw 5, and a rotary electric machine 13. The two ends of the fuselage 1 are base structures, and the rotary electric machine 13 and the movable base 6 are respectively installed. The mobile base 6 is moved by rotating the mobile base screw 5 mounted on the body.

The fiber reinforced composite thin shell connection structure at the end of the rotating electric machine includes a fiber reinforced composite thin shell 2, a rotating electric machine connecting plate 12, a left heating pipe mounting plate 11, and a left connecting socket 14 of the heating pipe; a rotating electric machine is installed on the rotating electric machine 13 The connection plate 12 has a left-side heating pipe mounting plate 11 on one side of the rotating electrical machine connection plate 12 and a left-side connection seat 14 of the heating pipe is installed on the left-side heating pipe mounting plate 11. The fiber-reinforced composite thin shell 2 is passed through the fiber-reinforced composite thin shell The mounting plate 10 is connected to the left heating pipe mounting plate 11; the fiber reinforced composite thin shell mounting plate 10 and the left heating pipe mounting plate 11 are heat-insulating materials.

The connection structure at the moving base includes a base shaft 7, a motor connecting cylinder 8, a right-side heating tube mounting plate 9, a right-side heating tube connecting base 17, a lead screw motor 21, an inner tube motor 22, and a heating tube motor 23. The base shaft 7 is mounted on the mobile base. A motor connecting cylinder 8 is installed at the end of the base shaft 7. The motor connecting cylinder 8 is provided with a right-side heating tube mounting plate 9 and a right-side heating tube 17 is installed on the right-side heating tube. On the mounting plate 9, the fiber-reinforced composite thin shell 2 is connected to the right-hand heating tube mounting plate 9 through the fiber-reinforced composite thin shell mounting plate 10. The lead screw motor 21, the inner cylinder motor 22 and the heating tube motor 23 are sequentially concentrically mounted on the motor. In the connecting cylinder 8, the fiber reinforced composite thin shell mounting plate 10 and the right heating tube mounting plate 9 are made of heat insulating material.

The aerodynamic load excitation structure of the test bench includes a middle cylinder 16, an inner cylinder 26, a spool 27, a spool screw 20, an air duct 4, and an air compressor 3; a middle cylinder 16 is installed in the middle of the left heating tube mounting plate 11. There is a small hole in the middle tube. The other end of the middle tube 16 can be inserted into the right-hand heating tube mounting plate 9 after the auxiliary material tube is installed; the inner tube 26 is placed in the center of the middle tube 16 and connected to the inner tube 26 motor. The inner tube 26 has the same small holes distributed on the middle cylinder 16; the slider 27 is placed in the inner cylinder 26, the slider 27 can be controlled and moved by the slider screw 20, and the slider screw 20 is installed on the screw motor 21; The air compressor 3 is connected to the base shaft 7 through the air guide pipe 4, the base shaft 7 and the motor connecting cylinder 8 have a hollow structure, and the gas enters the fiber reinforced composite thin shell through the motor connecting cylinder to be excited; the test bench is aerodynamically excited. For non-contact excitation, the position of the excitation can be adjusted by controlling the opening and closing state of the small hole on the middle tube 16.

The fiber reinforced composite thin shell 2 has flange structures at both ends for installation.

The fiber reinforced composite thin shell mounting plate 10 has four pieces, and two pieces on each side are used for the installation of the fiber reinforced composite thin shell.

The heating pipe connection seat is divided into left and right sides, six on each side, and are installed in the left connection seat moving groove 19 and the right connection seat moving groove 18 on the left heating pipe mounting plate and the right heating pipe mounting plate. ; The left connecting seat 14 of the heating tube is different from the right connecting seat 17 of the heating tube. The end of the right heating tube connecting seat has a long shaft. The long shaft end is connected to the motor connecting plate 24 through the heating pipe link 25. The motor connecting plate 24 Installed on the heating tube motor 23, the heating tube motor 23 rotates, the heating tube is controlled by the heating tube link 25, and the heating tube connection seat is moved in the right connection seat moving groove 18 and the left connection seat moving groove 19 to realize the heating pipe 15 and fiber reinforced composite thin shell 2 space adjustment;

The base shaft 7 is a hollow cylindrical end connected with an air compressor 3 and an air guide tube 4, and the front end is connected with a motor connection disk 24.

The inner cylinder 26 is placed in the middle cylinder 16, and the rotation of the inner cylinder 26 can control the small hole of the middle cylinder 16 to be closed; when the small holes of the middle cylinder 16, the inner cylinder 26 are opened, the position of the aerodynamic load excitation can be controlled by the movement of the slider 27; The sliding column 27 is an internal hollow cylinder, and the central part is connected to the lead screw.

In use, first install the fiber reinforced composite thin shell 2 on the experimental table, and fix it with the fiber reinforced composite thin shell fixing plate 10, then connect the test bench to the computer, open the computer operation software and rotate the motor. The heating tube motor 23 is controlled by the computer to adjust the temperature to reach the target temperature, and the inner cylinder motor 22 and the lead screw motor 21 are controlled to adjust the excitation position. After the air compressor 3 is opened, the fiber reinforced composite thin shell 2 is aerodynamically excited. The measurement is performed using a non-contact laser device during the excitation, and the experimental data is transmitted to the computer.

Claims

The fiber-reinforced composite thin-shell rotating test stand under the excitation of high-strength aerodynamic load considering the influence of uniformity and temperature gradient is characterized by including an integral fuselage structure, a fiber-reinforced composite thin-shell connection structure at the rotating electrical machine end, a connection structure at the moving base, Test bench aerodynamic load excitation structure, test bench aerodynamic load excitation structure and non-contact laser test equipment.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 1, wherein the integral fuselage structure comprises a fuselage, a mobile base, and a mobile base Lead screw and rotating motor; the two ends of the fuselage are base body structures, which are respectively equipped with a rotary motor and a moving base body, and the moving base body is moved by rotating the lead screw of the moving base body installed on the body.
The fiber-reinforced composite thin-shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 1, wherein the fiber-reinforced composite thin-shell connection structure at the end of the rotating electrical machine comprises a fiber-reinforced composite thin-shell 、 Rotating motor connection plate, left heating tube mounting plate, left side of the heating tube; Rotating motor is installed with a rotating motor connection plate, one side of the rotating motor connection plate has a left heating tube installation plate, and the left side of the heating tube It is installed on the left heating tube mounting plate, and the fiber reinforced composite thin shell is connected to the left heating tube installation plate through the fiber reinforced composite thin plate. The fiber reinforced composite thin plate and the left heating tube are Thermal insulation material.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 1, wherein the connection structure at the moving base includes a base shaft, a motor connecting cylinder, a right Side heating tube mounting plate, heating tube right connection seat, lead screw motor, inner tube motor and heating tube motor; the seat shaft is installed on the moving seat body, one end of the seat shaft is equipped with a motor connection tube, and the end of the motor connection tube is The right-hand heating tube mounting plate, the right-hand heating tube connection seat is mounted on the right-hand heating tube mounting plate, and the fiber-reinforced composite thin shell is connected to the right-hand heating tube mounting plate through the fiber-reinforced composite thin-shell mounting plate. The inner tube motor and the heating tube motor are sequentially concentrically installed in the motor connection tube; the fiber reinforced composite thin shell mounting plate and the right heating tube mounting plate are made of thermal insulation material.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 1, wherein the aerodynamic load excitation structure of the test stand comprises a middle cylinder, an inner cylinder, a sliding column, Spool screw, air duct, air compressor; a middle tube is installed in the middle of the left heating tube mounting plate, and there is a small hole in the middle tube. The other end of the middle tube can be inserted into the right heating tube after the auxiliary material tube is installed. The inner cylinder is placed in the middle of the middle cylinder and connected to the inner cylinder motor. The inner cylinder has the same small holes as the distribution on the middle cylinder. The slide cylinder is placed in the inner cylinder. The slide cylinder can be moved and controlled by the slide screw. The column screw is installed on the screw motor; the air compressor is connected to the shaft of the seat through an air pipe, the shaft of the seat and the motor connecting cylinder have a hollow structure, and the gas enters the fiber-reinforced composite thin shell through the motor connecting cylinder to be excited; The aerodynamic load excitation of the test bench is non-contact excitation, and the position of the excitation can be adjusted by controlling the opening and closing state of the small hole in the middle cylinder.
The fiber-reinforced composite thin shell rotating test stand under the excitation of high-strength aerodynamic load in consideration of uniformity and temperature gradient according to claim 3, wherein the fiber-reinforced composite thin shell has flange structures at both ends for installation.
The fiber-reinforced composite thin shell rotating test stand under the excitation of high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 3, characterized in that: the fiber-reinforced composite thin shell has four mounting plates, two on each side For fiber reinforced composite shell installation.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 1, wherein the heating pipe connection seat is divided into left and right sides, six on each side, and are installed In the left heating pipe mounting plate and the right heating pipe mounting plate, the left connecting seat moving groove and the right connecting seat moving groove are on the left heating pipe mounting plate and the right heating pipe. There is a long shaft at the end of the connection seat. The long shaft end is connected to the motor connection plate through the heating tube link. The motor connection disk is installed on the heating tube motor. The heating tube motor rotates. The heating tube is controlled by the heating tube link to connect the heating tube. The seat moves in the moving groove of the right connecting seat and the moving groove of the left connecting seat to realize the adjustment of the distance between the heating pipe and the fiber-reinforced composite thin shell.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 4, characterized in that: the base shaft is a hollow cylindrical end connected with an air compressor and an air duct, The front end is connected to the motor connection plate.
The fiber-reinforced composite thin shell rotating test stand under the excitation of a high-strength aerodynamic load considering the influence of uniformity and temperature gradient according to claim 4, wherein the inner cylinder is placed in the middle cylinder, and the rotation of the inner cylinder can control the small holes in the middle cylinder Closed; when the small holes of the middle tube and the inner tube are opened, the position of the aerodynamic load excitation can be controlled by the movement of the sliding column; the sliding column is an internal hollow cylinder, and the central part is connected to the lead screw.