WO2019071843A1

WO2019071843A1 - Rotary vibration test stand for fiber-reinforced composite disk-and-drum thin-wall member in bolt loosened condition

Info

Publication number: WO2019071843A1
Application number: PCT/CN2017/118855
Authority: WO
Inventors: 李晖; 陈延炜; 韩清凯; 翟敬宇; 杨雨霖; 原帅
Original assignee: 东北大学
Priority date: 2017-10-10
Filing date: 2017-12-27
Publication date: 2019-04-18
Also published as: CN107727346B; JP2020527694A; JP6863627B2; CN107727346A

Abstract

A rotary vibration test stand for a fiber-reinforced composite disk-and-drum thin-wall member in a bolt loosened condition, comprising a disk-and-drum thin-wall member device, a dynamic bolt loosening device, a linear start-stop device, and a laser circumferential scanning device. The loosened condition of a bolt can be simulated by the dynamic bolt loosening device. A reflector (16) is connected to a motor, and then the reflector and the motor are fixed in a hollow shaft of the fiber-reinforced composite disk-and-drum thin-wall member (3) to be installed at an inclination angle of 45 degrees. By switching on and off the motor, the differential rotation or the synchronous rotation of a laser light path and a disk-and-drum barrel can be realized. In combination with the reflector (16), the change of the light path is realized. The frequency, the amplitude and the phase of a certain circumferential section or a certain measuring point on the inner side of the fiber-reinforced composite disk-and-drum thin-wall member (3) can be detected. According to the vibration condition, the relationship and the rule between the change of the vibration characteristics of the disk-and-drum thin-wall member and the looseness degree of the bolt are studied, and then more bases are provided pointedly for the improvement of the bolt connecting structure, the connecting mode and the distributed design.

Description

Rotating vibration test bench for thin-walled members of fiber reinforced composite disc drum with loose bolts

Technical field

The invention belongs to the technical field of laser vibration measurement, and particularly relates to a rotary vibration test bench for a thin-walled member of a fiber reinforced composite disk under bolt loosening.

Background technique

In an aeroengine, the stator is generally composed of several sections, each of which is coupled by bolted mounting edges so that mechanical contact faces are formed between the segments. The existence of these contact surfaces inevitably changes the contact stiffness and contact damping of the contact area, and causes the stiffness and damping of the entire system to change, thereby affecting the vibration characteristics of the entire coupling system, and the hazards and losses are also difficult to estimate. Loose bolts are common in mechanical products and assemblies. Especially in the aerospace industry, in the assembly of high speed and high precision, loose bolts will adversely affect the normal operation of the core components. Cause an accident. Modern aero-engines pursue high performance and high thrust-to-weight ratio, the mechanism is becoming more and more complex, and the working conditions are more and more demanding, which leads to the gradual increase of the vibration of the whole machine. Whole machine vibration is the decisive factor affecting the life of the aircraft and flight safety. A large factor in the abnormal vibration of the engine rotor is caused by the misalignment of the rotor caused by loose bolts.

The invention aims at this phenomenon that cannot be ignored, and designs a test bench which can simulate the actual working condition of the aerospace engine blade disk and the drum drum, and selectively designs the individual symmetrically distributed connecting bolts within the safe range. Loosen, and then through the Doppler laser sensor, the vibration of the blade disc and the inner wall of the drum caused by loose bolts is measured.

Summary of the invention

In order to solve the above technical problems, the present invention provides a rotational vibration test stand for a fiber reinforced composite disc drum thin-walled member under bolt loosening. The present invention designs a dynamic bolt loosening device for simulating looseness of a bolt. The mirror is connected to the motor and fixed together in the hollow shaft of the thin-walled member of the fiber reinforced composite disc drum at an inclination angle of 45°. Through the opening and closing of the motor, the laser optical path and the drum drum are differentially rotated or synchronously rotated, and combined with reflection. The mirror realizes the change of the optical path, realizes the vibration of a certain circumferential section or a certain measuring point inside the thin-walled member of the fiber-reinforced composite disc, and studies the relationship between the vibration characteristics of the drum and the degree of looseness of the bolt, and the targeted Provide more basis for the improvement of bolt connection structure, connection method and distribution design.

The specific technical solutions are as follows:

A rotating vibration test stand for a fiber-reinforced composite disc drum thin-walled member with loose bolts, characterized in that it comprises a disc drum thin-wall member device, a dynamic bolt loosening device, a linear start-stop device, a laser circumferential scanning device, and a roulette-shaft integral member; The linear start-stop device comprises a left slider guide plate and a right slider guide plate, wherein the dynamic bolt loosening device comprises an asynchronous rotating disk, and the disk drum thin-wall member device and the dynamic bolt loosening device are mounted on the wheel-shaft integration On the member, the two ends are respectively connected with the bearing seat, and the left slider guide plate and the right slider guide plate of the linear start-stop device are respectively connected with the dynamic bolt loosening device through the asynchronous rotating disks at both ends to drive the work; The laser circumferential scanning device is used for measuring the vibration of the corresponding measuring point or the circumferential section of the thin-walled member of the fiber-reinforced composite disc.

The dynamic bolt loosening device comprises an internal gearing cylinder, a driving gear and a telescopic shaft, wherein the driving gear and the internal gearing cylinder are fixed on the wheel-shaft integral member by a key connection, and the left end of the telescopic shaft passes the interference fit and the pinion gear Connected, the right sleeve can be telescopic, and the right side is bolted to the thin drum member of the drum by a regular hexagonal bolt sleeve; the right structure is axisymmetric with respect to the blade disc on the left side.

The disc drum thin-wall member device comprises a blade disc and a fiber-reinforced composite disc drum thin-wall member, wherein the disc disc is divided into a blade left disc and a blade right disc, the left side of the blade disc, and the left disc of the blade is sequentially connected with the fiber-reinforced composite disc drum The thin-walled member is connected with the dynamic bolt loosening device, and is fixed together on the wheel-shaft integral member, and is fixed to the bearing seat through the bearing; the right side structure of the blade disk and the left structure are axisymmetric with respect to the blade disk; the wheel disk - The shaft of the shaft integral member is connected to the motor via a coupling.

The linear start-stop device comprises a guide screw, a left-left slider guide, a right slide guide, an asynchronous rotating disc and a servo motor. When the servo motor is started, the left slider guide is opposite to the right slider guide Or the separation movement, the induction gear completes the feed engagement and the exit separation by asynchronously rotating the disc, and the linear start and stop output device controls the dynamic loose bolt process.

The laser circumferential scanning device comprises a Doppler laser vibrometer, a mirror, a ball screw, and a motor. The laser emitting port of the Doppler laser vibrometer is aligned with the center of the mirror, and the optical path is reflected by the mirror. The X-axis direction is changed to the Y-axis direction and is incident on the inner surface of the thin-walled member of the disc drum; the mirror is connected to the top end of the ball screw and connected to the motor, and is fixed together in the hollow shaft of the thin-walled member of the fiber-reinforced composite disc drum. 45° inclination angle installation; rotating the ball screw rear end knob, the mirror can be fed in the Z-axis direction, changing the position of the cross-section of the drum drum; the motor is turned off, the laser light path and the drum drum are synchronously rotated. It can measure the vibration of a measuring point of the fiber-reinforced composite disc drum thin-walled member, the motor starts, the laser light path and the drum drum differential movement, and can measure the vibration of a certain circumferential section inside the fiber-reinforced composite disc drum thin-walled member. Happening.

The method for using the rotating vibration test bench of the fiber reinforced composite disc drum thin-walled member under the loosening of the bolt includes the following steps:

(1) Rotating vibration test bench of fiber-reinforced composite disc drum thin-walled member under loosening of mounting bolts to ensure reliable realization of required functions;

(2) determining that some or all of the screws of the fiber-reinforced composite disc drum thin-walled member are loosened, and the telescopic shaft is adjusted accordingly;

(3) Pre-experiment, start the motor, and carry out the idling experiment of the fiber-reinforced composite disc drum thin-walled member for about 30 minutes to eliminate the influence of the motor thermal error on the experiment;

(4) Through the linear start-stop device, the dynamic bolt loosening device is sent to the position where the bolt is to be loosened, and the telescopic shaft is manually adjusted to make it fit with the bolt;

(5) Starting the dynamic bolt loosening device to simulate the looseness of some or all of the bolts of the fiber-reinforced composite disc drum thin-walled member;

(6) Adjusting the Doppler laser vibrometer so that the emission beam is located at the center line of the drum of the fiber-reinforced composite disc drum thin-walled member, and the laser circumference scanning device is adjusted into the fiber-reinforced composite disc drum thin-wall member drum hollow shaft Corresponding position, and using the Doppler laser vibrometer to achieve vibration measurement of a certain measuring point of the fiber-reinforced composite drum drum thin-wall member drum member of interest;

(7) Start the mirror low-speed rotating motor to realize differential rotation, and use the Doppler laser vibrometer to realize the vibration measurement of all measuring points on a certain circumferential section of the fiber-reinforced composite disc drum thin-walled component drum;

(8) Start the laser of the laser circumference scanning device, change the position of the mirror, and repeat steps (6) and (7) to achieve the vibration measurement of all the measuring points on the circumferential section of the drum of the fiber-reinforced composite disc drum thin-walled member. ;

(9) Adjusting the radial position of the Doppler laser vibrometer so that the laser beam emitted from it is projected to a position of the measuring point outside the thin-walled member of the fiber-reinforced composite disc drum, and the fiber can also be realized in a rotating state. Vibration measurement of a certain measuring point outside the thin-walled member of the composite disc drum.

The advantages of this method are:

1. The present invention utilizes a fiber reinforced composite material to simulate a thin wall drum of an actual aeroengine;

2. The driving gear of the linear start-stop device of the present invention is in a feeding state, and when the meshing is completed, the left slider guide plate and the right slider guide plate move relative to each other; and the driving gear is in a separated state, when the meshing is engaged, the left slider guiding plate and The right slider guide moves away from each other. Therefore, the design of the screw can not keep the spiral in a direction of rotation, but the boundary of the screw is used as the boundary line, and the two sides are designed with different directions of rotation. When the servo motor is started, the left slider guide and the right slider guide are respectively moved relative to each other, and the drive gear is separated by the asynchronous rotation disc to complete the feed engagement and the exit separation, thereby passing the linear start/stop output device control test bench. Dynamically loosening the beginning of the bolt;

3. The invention designs a dynamic bolt loosening device for simulating the looseness of the bolt, and the mirror is connected to the motor, and is fixed together with a tilt angle of 45° in the hollow shaft of the thin-walled member of the fiber reinforced composite disc drum, and the entire mirror device is opposite to the mirror device. The drum of the fiber-reinforced composite disc drum thin-walled member is stationary, the motor is closed, the laser light path and the drum drum are synchronously rotated, and the vibration of a measuring point of the fiber-reinforced composite disc drum thin-walled member can be measured, and the motor starts, the laser The optical path and the drum drum differential movement can measure the vibration of a certain circumferential section inside the fiber-reinforced composite disc drum thin-walled member. The mirror is used to realize the change of the optical path, and the differential rotation realizes the laser measurement of all the measuring points on the circumferential interface. The invention realizes differential rotation or synchronous rotation of the laser light path and the drum drum by the opening and closing of the motor, realizes the change of the optical path by combining the mirror, and detects a certain circumferential section or a certain measuring point inside the thin-walled member of the fiber-reinforced composite disc drum. The frequency, amplitude and phase of the vibration, through the above vibration situation, study the relationship between the vibration characteristics of the drum and the degree of looseness of the bolt and the law, and provide more targeted improvements to the bolt connection structure, connection method and distribution design. More basis.

4. The Doppler laser vibrometer used in the present invention realizes the function of light-to-vibration information recording by using the Doppler effect, and can perform non-contact vibration test on the surface, and study the vibration characteristics of the disc drum and the bolt through the vibration condition. The relationship and law of the degree of looseness provide more basis for the improvement of bolted joint structure, connection mode and distribution design.

DRAWINGS

Figure 1 is a structural view of a rotating vibration test rig of a thin-walled member of a fiber reinforced composite disc under loosening of a bolt;

Figure 2 is a diagram of a dynamic bolt loosening device;

Figure 3 is a diagram of a laser peripheral scanning core device.

In the figure, 1-Doppler laser vibrometer; 2-rail screw; 3-fiber reinforced composite disc drum thin-walled member; 4-left slider guide; 5-servo motor; 6-wheel-shaft integration Member; 7-blade disc; 8-bearing seat; 9-asynchronous rotating disc; 10--acting gear; 11-pinion; 12-internal gear cylinder; 13-retractable shaft; 14-left wheel; 15-ball screw ; 16-mirror; 17-knob; 18-right wheel; 19-right slider guide; 20-blade left disk; 21-blade right disk; 22-sleeve.

Detailed ways

The invention will be described in detail below with reference to the drawings, but the scope of the invention is not limited by the accompanying drawings.

Fig.1 is a structural diagram of a rotating vibration test stand of a fiber-reinforced composite disc drum thin-walled member under loose bolts; a rotating vibration test bed of a fiber-reinforced composite disc drum thin-walled member under bolt loosening, including a drum thin-wall member device, a dynamic bolt loosening device, a linear start-stop device, a laser circumference scanning device, a wheel-shaft integral member 6; the linear start-stop device comprises a left slider guide plate 4 and a right slider guide plate 19, and the dynamic bolt loosening device comprises an asynchronous rotating disk 9 The disc drum thin-wall member device and the dynamic bolt loosening device are mounted on the wheel-shaft integral member 6, and the two ends are respectively connected with the bearing housing 8, the left slider guide plate 4 and the right sliding of the linear start-stop device The block guides 19 are respectively connected with the dynamic bolt loosening device through the asynchronous rotating discs 9 at both ends to drive the work; the laser circumferential scanning device is used for measuring the corresponding measuring points or circumferential sections of the fiber-reinforced composite disc drum thin-walled members 3 Vibration situation.

2 is a view of a dynamic bolt loosening device including an internal gear cylinder 12, a driving gear 10, and a telescopic shaft 13, and the driving gear 10 and the internal gear cylinder 12 are fixed to the wheel-shaft by a key connection. On the unitary member 6, the left end of the telescopic shaft 13 is connected to the pinion 11 by an interference fit, the right sleeve 22 can be telescoped, and the right side is bolted to the fiber reinforced composite disc drum thin wall member 3 by a regular hexagonal bolt sleeve. The right side structure is axisymmetric with respect to the blade disc 7 on the left side;

The disc drum thin-wall member device comprises a blade disc 7 and a fiber-reinforced composite disc drum thin-walled member 3, and the vane disc 7 is divided into a vane left disc 20 and a vane right disc 21, the vane disc left side, and the vane left disc 20 in turn The fiber reinforced composite disc drum thin wall member 3 is connected with the dynamic bolt loosening device, and is fixed together on the wheel-shaft integral member 6 and fixed to the bearing housing 8 by bearings; the right side structure of the blade disc and the left side structure are related to the blade The disk 7 is axisymmetric; the shaft of the wheel-shaft integral member 6 is connected to the motor through a coupling;

The linear start-stop device comprises a guide screw 2, a left slide guide 4, a right slide guide 19, an asynchronous rotating disc 9 and a servo motor 5, the left slider guide 4 and the right of the linear start-stop device The slider guides 19 are respectively connected with the dynamic bolt loosening device through the asynchronous rotating discs 9 at both ends to drive the work. When the servo motor 5 is started, the left slider guide 4 and the right slider guide 19 are opposite or apart from each other. Movement, the drive gear 10 completes the feed engagement and the exit separation by asynchronously rotating the disk 9, and the linear start-stop output device controls the dynamic loose bolt process;

3 is a schematic diagram of a laser circumferential scanning core device including a Doppler laser vibrometer 1 , a mirror 16 , a ball screw 15 , a motor, and a laser of the Doppler laser vibrometer 1 The transmitting port is aligned with the center of the mirror 16, and the optical path is rotated from the X-axis direction to the Y-axis direction via the mirror 16, and is incident on the inner surface of the fiber-reinforced composite disk drum thin-walled member 5; the mirror 16 is attached to the top of the ball screw 15. And connected to the motor, fixed together in the hollow shaft of the fiber reinforced composite disc drum thin-walled member 3 at an inclination angle of 45°; rotating the rear end knob 17 of the ball screw 15 enables the mirror 16 to feed in the Z-axis direction , changing the position of the cross section of the drum drum; the motor is turned off, the laser light path and the drum drum are synchronously rotated, and the vibration of a certain measuring point of the fiber reinforced composite disc drum thin wall member 3 can be measured, the motor starts, and the laser light path The differential movement of the drum drum can be used to measure the vibration of a circumferential section of the inner side of the fiber-reinforced composite disc drum thin-walled member 3.

(1) The loosening of the fiber-reinforced composite disc drum thin-walled member 3 under the loosening of the mounting bolts ensures the reliable realization of the required functions;

(2) determining that some or all of the screws of the fiber reinforced composite disc drum thin-walled member 3 are loosened, and the telescopic shaft is adjusted accordingly;

(3) Pre-experiment, start the motor, and carry out the idling experiment of the fiber-reinforced composite disc drum thin-walled member 3 for about 30 minutes to eliminate the influence of the motor thermal error on the experiment;

(4) Through the linear start-stop device, the dynamic bolt loosening device is sent to the position where the loose bolt is to be placed, and the telescopic shaft 13 is manually adjusted to make a reliable fit with the bolt;

(6) Adjusting the Doppler laser vibrometer 1 so that the emission beam is located at the center line of the drum of the fiber-reinforced composite disc drum thin-walled member 3, and adjusting the laser circumference scanning device into the fiber-reinforced composite disc drum thin-walled member 3 drum Corresponding position of the hollow shaft of the cylinder, and using the Doppler laser vibrometer 1 to achieve vibration measurement of a certain measuring point of the drum member of the fiber-reinforced composite disc drum thin-walled member 3 of interest;

(7) Starting the mirror low-speed rotating motor to realize differential rotation, and using the Doppler laser vibrometer 1 to realize the vibration measurement of all measuring points on a circumferential section of the fiber-reinforced composite disc drum thin-walled member 3;

(8) starting the laser of the laser circumferential scanning device, changing the position of the mirror 16, and repeating steps (6) and (7), thereby realizing all the measuring points on the circumferential section of the drum of the fiber-reinforced composite disc drum thin-walled member 3. Vibration measurement

(9) Adjusting the radial position of the Doppler laser vibrometer 1 so that the laser beam emitted therefrom is projected to a position of a certain measuring point outside the fiber-reinforced composite disc drum thin-walled member 3, and can also be rotated The vibration measurement of a certain measuring point outside the fiber-reinforced composite disc drum thin-walled member 3 is realized.

Claims

A rotating vibration test stand for a fiber-reinforced composite disc drum thin-walled member with loose bolts, characterized in that it comprises a disc drum thin-wall member device, a dynamic bolt loosening device, a linear start-stop device, a laser circumferential scanning device, and a roulette-shaft integral member; The linear start-stop device comprises a left slider guide plate and a right slider guide plate, wherein the dynamic bolt loosening device comprises an asynchronous rotating disk, and the disk drum thin-wall member device and the dynamic bolt loosening device are mounted on the wheel-shaft integration On the member, the two ends are respectively connected with the bearing seat, and the left slider guide plate and the right slider guide plate of the linear start-stop device are respectively connected with the dynamic bolt loosening device through the asynchronous rotating disks at both ends to drive the work; The laser circumferential scanning device is used for measuring the vibration of the corresponding measuring point or the circumferential section of the thin-walled member of the fiber-reinforced composite disc.
The dynamic vibration bolt loosening device for a fiber reinforced composite disc drum thin-walled member according to claim 1, wherein the dynamic bolt loosening device comprises an internal gear cylinder, a driving gear and a telescopic shaft, and the driving gear and The internal gear barrel is fixed on the wheel-shaft integral member by a key connection, the left end of the telescopic shaft is connected with the pinion through an interference fit, the right sleeve can be expanded and contracted, and the right side is passed through the regular hexagonal bolt sleeve and the fiber reinforced composite The bolted connection of the thin-walled member of the drum; the right structure is axisymmetric with respect to the blade disc on the left side.
The rotary vibration test stand for a fiber reinforced composite disc drum thin-wall member according to claim 1, wherein the disc drum thin-wall member device comprises a blade disc and a fiber reinforced composite disc drum thin-wall member, The blade disc is divided into the left disc of the blade and the right disc of the blade, and the left side of the blade disc, the left disc of the blade is connected with the fiber reinforced composite disc drum thin wall member and the dynamic bolt loosening device in series, and is fixed together on the wheel-shaft integral member. The bearing is fixed on the bearing housing; the right side structure of the blade disc and the left side structure are axisymmetric with respect to the vane disc; the shaft of the roulette-shaft integral member is connected to the motor through the coupling.
The rotating vibration test stand for a thin-walled member of a fiber reinforced composite disc drum according to claim 1, wherein the linear start-stop device comprises a guide screw, a left slide guide, a right slide guide, Asynchronously rotate the disk and the servo motor. When the servo motor is started, the left slider guide plate and the right slider guide plate move relative to or away from each other. The asynchronous gear rotates the drive gear to complete the feed engagement and the exit separation, and the line starts and stops. The output device controls the dynamic loose bolt process.
The rotary vibration test stand for a fiber reinforced composite disc drum thin-wall member according to claim 1, wherein the laser circumferential scanning device comprises a Doppler laser vibrometer, a mirror, a ball screw, a motor, the laser emitting port of the Doppler laser vibrometer is aligned with the center of the mirror, and the optical path is converted from the X-axis direction to the Y-axis direction via the mirror, and is incident on the inner surface of the thin-wall member of the disc drum; the mirror connection At the top of the ball screw and connected to the motor, it is fixed at a 45° inclination angle in the hollow shaft of the thin-walled member of the fiber reinforced composite disc drum; the rear end knob of the rotating ball screw can make the mirror realize the Z-axis direction. Give, change the position of the cross section of the drum drum; the motor is turned off, the laser light path and the drum drum rotate synchronously, and the vibration of a measuring point of the fiber reinforced composite disc drum thin wall member can be measured, the motor starts, the laser light path And the differential movement of the drum drum can measure the vibration of a certain circumferential section inside the thin-walled member of the fiber reinforced composite disc.
The method for using a rotational vibration tester for a fiber reinforced composite disc drum thin-walled member under bolt loosening according to claim 1, comprising the following steps:

(1) Rotating vibration test bench of fiber-reinforced composite disc drum thin-walled member under loosening of mounting bolts to ensure reliable realization of required functions;

(2) determining that some or all of the screws of the fiber-reinforced composite disc drum thin-walled member are loosened, and the telescopic shaft is adjusted accordingly;

(3) Pre-experiment, start the motor, and carry out the idling experiment of the fiber-reinforced composite disc drum thin-walled member for about 30 minutes to eliminate the influence of the motor thermal error on the experiment;

(4) Through the linear start-stop device, the dynamic bolt loosening device is sent to the position where the bolt is to be loosened, and the telescopic shaft is manually adjusted to make it fit with the bolt;

(5) Starting the dynamic bolt loosening device to simulate the looseness of some or all of the bolts of the fiber-reinforced composite disc drum thin-walled member;

(6) Adjusting the Doppler laser vibrometer so that the emission beam is located at the center line of the drum of the fiber-reinforced composite disc drum thin-walled member, and the laser circumference scanning device is adjusted into the fiber-reinforced composite disc drum thin-wall member drum hollow shaft Corresponding position, and using the Doppler laser vibrometer to achieve vibration measurement of a certain measuring point of the fiber-reinforced composite drum drum thin-wall member drum member of interest;

(7) Start the mirror low-speed rotating motor to realize differential rotation, and use the Doppler laser vibrometer to realize the vibration measurement of all measuring points on a certain circumferential section of the fiber-reinforced composite disc drum thin-walled component drum;

(8) Start the laser of the laser circumference scanning device, change the position of the mirror, and repeat steps (6) and (7) to achieve the vibration measurement of all the measuring points on the circumferential section of the drum of the fiber-reinforced composite disc drum thin-walled member. ;

(9) Adjusting the radial position of the Doppler laser vibrometer so that the laser beam emitted from it is projected to a position of the measuring point outside the thin-walled member of the fiber-reinforced composite disc drum, and the fiber can also be realized in a rotating state. Vibration measurement of a certain measuring point outside the thin-walled member of the composite disc drum.