A rub parameter and rotor initial assembly state controllable blisk and casing rub simulation device

Abstract

The application discloses a kind of blade disc and casing rub simulation devices of rub parameter and rotor initial assembly state controllable, including parameter controllable rub device, initial assembly state adjustable rotor blade system, front supporting system and rear supporting system.Parameter controllable rub device uses two-stage adjustable structure and elastomer, can adapt to different blade size, rub rotational speed, rub stiffness and damping, rub surface length etc. Rubbing condition, can control rub start and rub end under the subcritical speed or supercritical speed of rotor in real time, quickly, and can accurately identify whether rub occurs and extract rub force.Rotor connection structure position is designed with inclined washer, realizes the adjustment of contact area under different assembly states, the adjustment of inertia main shaft inclination angle of wheel disc, and the inclined washer can be replaced by laminated structure.

Description

Technical Field

[0001] This invention relates to the field of simulation technology for rotor-stator collision faults in aero-gas turbines, and in particular to a device for simulating collision faults between a bladed disk and a casing with controllable collision parameters and initial rotor assembly state. Background Technology

[0002] Modern advanced aero-gas turbines are constantly improving their structural efficiency and gradually developing towards higher speed and load characteristics. However, due to factors such as processing and assembly, initial thermal bending, rubbing thermal bending, and bending deformation at high speeds, the rotor disk's inertial axis of the aero-gas turbine exhibits initial tilting. This alters the distribution of rotational inertial loads on the rotor structure, resulting in significant rotor vibration response even after the rotor's center of mass shifts at high speeds, and this vibration continues to increase with speed. Furthermore, in the development of advanced aero-gas turbines, to meet varying demands for increased efficiency and power, the gap between the rotor and stator is continuously reduced, increasing the likelihood of rotor-stator rubbing during operation, sometimes making it unavoidable. When the relative vibration amplitude between the rotor and stator at the same location exceeds the gap, a collision occurs. Simultaneously, due to the tangential velocity between the rotor and stator at the contact point, a frictional effect exists between them. Therefore, rubbing poses a potential threat to the stable operation of mechanical equipment and may seriously affect its performance and safety.

[0003] The rubbing vibration response is closely related to the rotor structure assembly characteristics and rubbing parameters. However, the existing rotor blade and casing rubbing devices do not have the function of realizing the initial tilt of the rotor's inertial main shaft, nor do they have the function of simultaneously controlling the rubbing stiffness and damping, rubbing speed, rubbing surface length, and real-time control of the rubbing start and end parameters. They cannot realize the rubbing process of the rotor and casing under specific speed, stiffness, and damping parameters due to the initial tilt of the inertial main shaft and changes in contact area caused by assembly. Summary of the Invention

[0004] To address the difficulties in controlling the rubbing stiffness, rubbing speed, and the start and end of rubbing in existing blade-casing rubbing devices, and the fact that the initial assembly state of the rotor depends on the machining results and cannot reproduce rotor-casing rubbing with specific initial assembly parameters under different rubbing parameters, this invention provides a rotor blade-casing rubbing device with adjustable rubbing parameters and initial assembly state. It can adjust the rubbing stiffness, rubbing speed, rubbing surface length, initial contact area of ​​the rotor connection interface, and initial tilt of the wheel disc, and can control the occurrence and end of rubbing in real time.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bladed disk and casing rubbing simulation device with controllable rubbing parameters and rotor initial assembly state is provided. The device includes a controllable rubbing body device with controllable parameters, a rotor blade system with adjustable initial assembly state, a front support system, a rear support system, and a base. The rotor blade system is mounted on the base via a front support system and a rear support system, and the rotor can be driven by a motor of the power system via a coupling. The rotor blade system includes blades, a wheel disk, a drum shaft, inclined shims, etc., wherein the blades are fixed to the wheel disk by bolts, and the wheel disk and the drum shaft are connected by a flange-stop, and inclined shims are installed at the stop. The controllable rubbing device is fixed on the base and includes a support frame, a rubbing housing, an L-shaped support plate, a servo motor, a lead screw, an elastic body A, an elastic body B, a rubbing body fixing support plate, a rubbing body, support rod bolts, etc. The rubbing housing and the servo motor are fixed on the base via the support frame and the L-shaped support plate, respectively. The servo motor is connected to one end of the lead screw, which establishes a deterministic relationship between the rotation of the servo motor and the translation of the lead screw. The other end of the lead screw contacts the center position of the rubbing body fixing support plate, and the two ends of the rubbing body fixing support plate are fixed to the rubbing housing by two support rod bolts and elastic bodies.

[0007] The blades in the rotor blade system are evenly distributed on the wheel disk, and several threaded through holes are evenly distributed on the wheel disk with the center of the wheel disk as the center. As needed, counterweight screws are installed at these locations to precisely control the magnitude of the unbalanced excitation.

[0008] The inclined shim at the stop position where the drum shaft and the wheel disk are connected in the rotor blade system can be replaced with several overlapping shims. The number (thickness) of the shims varies at different circumferential positions to achieve assembly parameters similar to the initial tilt of the wheel disk, simulating the tilt of the wheel disk.

[0009] The tilting shims in the rotor blade system can be installed anti-symmetrically on both sides of the wheel disk, so that only the wheel disk tilts while the rotor shaft does not tilt. At the same time, the misalignment of the support caused by the tilting shims can be compensated by adjusting the support height.

[0010] The controllable rubbing device has a circular or polygonal rubbing housing, which can be equipped with multiple servo motors and corresponding rubbing bodies in the circumferential direction to simulate the effects of multi-point rubbing and circumferential deformation of the housing on rubbing.

[0011] The thickness and pitch of the lead screw in the controllable rubbing device can be determined according to the force and torque to be transmitted. The selected pitch and the rotational angular accuracy of the servo motor together determine the minimum displacement for fine adjustment of the rubbing body. Furthermore, the higher the response speed of the servo motor, the more sensitive it is to control the start and end of the rubbing and the degree of rubbing.

[0012] A ring-shaped elastic body, such as rubber or metal rubber, can be installed between the lead screw and the fixed support plate of the friction body in the controllable friction device to facilitate control of the friction stiffness.

[0013] The friction body in the controllable friction device is fixed to the friction body fixing plate by bolts, which facilitates the replacement of the friction body according to the friction needs and realizes the control of the friction surface length, friction body angle, etc.

[0014] The two ends of the fixed support plate of the friction body in the controllable friction device are connected to the center position by elastic support rods. Multi-directional strain gauges or acceleration sensors are installed on the elastic support rods to pick up the vibration amount of the friction body and the magnitude of the friction force.

[0015] The support bolts in the controllable rubbing device can control the radius position of the rubbing body fixing plate relative to the rotation center within a large range. It can be used to initially adjust the position of the rubbing body when the machine is stopped. This can adapt to rotor blade systems with different tip radii, or be used to adjust the initial gap between the rubbing body and the blade.

[0016] An elastic body is fixed on the support rod bolt in the controllable rubbing device. The elastic body, together with the rigidity of the rubbing body fixing plate and the lead screw, controls the rubbing stiffness and can increase the fine adjustment distance of the rubbing body.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0018] (1) The present invention can adjust the initial assembly parameters of the rotor blade system by tilting shims or stacked structure, control the initial tilt angle of the wheel in the assembly state, the adjustment method is reliable and convenient, and a compensation method for the degree of misalignment of the support points after adjustment is given.

[0019] (2) In this invention, the blades are mounted on the wheel disc by bolts, making it convenient to replace blades of different shapes, sizes and materials;

[0020] (3) The present invention uses a servo motor and a lead screw to precisely control the displacement of the rubbing body, and can control the start and end of the rubbing in real time and use the picked-up rubbing force as a feedback signal to accurately control the degree of rubbing.

[0021] (4) The present invention controls the friction stiffness by means of an elastomer and a lead screw, without the need to design a coating structure, and can accurately and reliably simulate different friction stiffnesses;

[0022] (5) The present invention increases the fine adjustment range of the displacement of the rubbing body by using an elastomer, which can broaden the controllable range of the rubbing parameters;

[0023] (6) The friction body of the present invention is installed on the friction body fixing support plate by bolts, making it convenient to replace friction bodies of different types and parameters;

[0024] (7) This invention can study different rubbing forms between the blade and the casing, such as single-point rubbing, multi-point rubbing, local rubbing and full-circumference rubbing, by changing the number of servo motors and corresponding rubbing bodies;

[0025] (8) This invention is easy to use, has strong versatility, and facilitates the promotion of impact tests with controllable parameters. Attached Figure Description

[0026] Figure 1 This is an overall assembly drawing of a bladed disk and casing collision simulation device with controllable collision parameters and rotor initial assembly state according to the present invention.

[0027] Figure 2 This is the overall assembly drawing of a friction device with controllable friction parameters.

[0028] Figure 3 A partial cross-sectional view of a friction device with controllable friction parameters.

[0029] Figure 4 Design drawing for the fixed support plate of the collision body.

[0030] Figure 5 A cross-sectional view of the assembly of the tilting device for the inertial spindle of the wheel.

[0031] Figure 6 Design drawing for inclined shims.

[0032] Figure 7 Adjust the stacking device assembly drawing to the initial assembly state of the wheel.

[0033] In the diagram, 1. Controllable rubbing device, 2. Rotor blade system, 3. Front support system, 4. Rear support system, 5. Base plate, 1-1. Rubbing housing, 1-2. Support frame, 1-3. L-shaped support plate, 1-4. Servo motor, 1-5. Lead screw, 1-6. Lead screw sleeve, 1-7. First fixing bolt, 1-8. Support plate, 1-9. Support rod bolt, 1-10. Fixing nut, 1-11. Circular washer, 1-12. First clamping bolt, 1-13. Elastic body A, 1-14. Rubbing body fixing support plate, 1-15. Second clamping bolt, 1-16. Rubbing body, 1-17. Second fixing bolt, 1-18. Elastic body B, 2-1. Drum shaft, 2-2. Third fastening bolt, 2-3. Inclined washer, 2-4. Wheel, 2-5. Blade, 2-6. Journal, 2-7. Laminated blade. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0035] like Figure 1As shown, the bladed disk and casing rubbing simulation device of the present invention, which allows for controllable rubbing parameters and initial rotor assembly state, includes a controllable rubbing device 1 with controllable parameters, a rotor blade system 2 with adjustable initial assembly state, a front support system 3, a rear support system 4, and a base 5. The controllable rubbing device 1, the front support system 3, and the rear support system 4 are mounted on the base 5, and the rotor blade system 2 with adjustable initial assembly state is mounted on the front support system 3 and the rear support system 4.

[0036] like Figure 2 and Figure 3 As shown, the controllable friction device 1 with controllable parameters includes a friction housing 1-1, a support frame 1-2, an L-shaped support plate 1-3, a servo motor 1-4, a lead screw 1-5, a lead screw sleeve 1-6, a first fixing bolt 1-7, a support plate 1-8, a support rod bolt 1-9, a fixing nut 1-10, a circular washer 1-11, a first clamping bolt 1-12, an elastic body A 1-13, a friction body fixing support plate 1-14, a second clamping bolt 1-15, a friction body 1-16, a second fixing bolt 1-17, and an elastic body B 1-18.

[0037] The support frame 1-2 is fixed to the base 5 with anchor bolts. The friction housing 1-1 and the L-shaped support plate 1-3 are fixed to the support frame 1-2 with bolts. The servo motor 1-4 is fixed to the L-shaped support plate 1-3 with bolts and is connected to the lead screw 1-5 through a keyway, driving the lead screw 1-5 to rotate. The lead screw 1-5 is connected to the lead screw sleeve 1-6 through a threaded connection, and the lead screw sleeve 1-6 is fixed to the support plate 1-8 with the first fixing bolt 1-7. Therefore, when the lead screw 1-5 rotates, it undergoes axial displacement relative to the lead screw sleeve 1-6. The lead screw sleeve 1-6 is fixed to the support plate 1-8 with the first fixing bolt 1-7, and 1-8 is fixed to the friction housing 1-1 with the support bolt 1-9, the fixing nut 1-10, and the circular washer 1-11. The friction body 1-16 is fixed to the friction body fixing support plate 1-14 by the second fixing bolt 1-17. The friction body fixing support plate 1-14 is pressed onto the support rod bolt 1-9 by the first clamping bolt 1-12, the second clamping bolt 1-15, and the elastic body A1-13. By selecting the thread length of the support rod bolt 1-9, the position of the friction body relative to the center line of the friction housing can be adjusted, i.e., "coarse adjustment". The lead screw 1-5 is pressed against the friction body fixing support plate 1-14 by the elastic body B1-18. When the lead screw 1-5 rotates, the lead screw 1-5 pushes against the friction body and causes displacement, adjusting the position of the friction body 1-16 relative to the center line of the friction housing 1-1, i.e., "fine adjustment".

[0038] like Figure 4 As shown, the fixed support plate 1-14 of the rubbing body is designed with an elastic support rod. Strain gauges can be attached to the elastic support rods to obtain the vibration response of the rubbing body during the rubbing process.

[0039] like Figure 5 and Figure 6 As shown, the initially assembled adjustable rotor blade system 2 includes a drum shaft 2-1, a third fastening bolt 2-2, inclined shims 2-3, a wheel 2-4, blades 2-5, and a journal 2-6. The drum shaft 2-1, the two inclined shims 2-3, the wheel 2-4, and the journal 2-6 are connected together by the third fastening bolt 2-2. The inclined shims 2-3 have inclined end faces and uneven thicknesses. The inclined end faces are defined by an inclination angle α (1° in the example). The position with the greatest thickness is indicated by the letter (T) (8.9 mm in the example), and the position with the thinnest thickness is indicated by the letter (S) (7.1 mm in the example). The axial distance between the two inclined shims 2-3 is L (74.00 mm in the example), the offset distance of the axis between the drum shaft 2-1 and the journal 2-6 is δ (1.29 mm in the example), and the relationship between the tilt angle α, the axial distance L and the offset distance δ is: δ=Ltan(α).

[0040] like Figure 7 As shown, the inclined shim 2-3 can be replaced by the lamination 2-7. The number of laminations installed at different circumferential positions of the rotor is different. In the figure, a, b, and c represent the corresponding positions with 3, 4, and 5 laminations installed, respectively. Partial view B shows the installation state of 5 laminations.

[0041] The controllable rubbing device 1 uses an elastomer to control the elastic restoring force and damping of the rubbing body, thereby achieving control over the rubbing stiffness and damping; the elastomer includes a helical spring, metal rubber, or rubber.

[0042] As an example, the adjustment range and friction stiffness of the friction body in this invention are achieved through... Figure 3 The calculation results in the example are explained below. The support bolt is M8×60, the screw pitch is 0.6mm, and the stiffness of elastic body A is 1×10. 6 N / m, the stiffness of elastic body B is 5×10 N / m. 5 The friction body fixing plate is made of 45# steel, and its elastic support rod has a cross-section of 2mm×2mm and a length of 25mm.

[0043] (1) The stiffness of the four elastic supports acting as a controllable friction device can be calculated as 2.1 × 10⁻⁶. 5 N / m, the stiffness of the elastic support rod connected in series with the elastic body A is The stiffness after being connected in parallel with elastic body B is 1.9 × 10⁻⁶. 5 +5×10 5 =6.9×10 5 N / m.

[0044] (2) The achievable coarse adjustment range is 0–35 mm. Considering the yield strength of 45# steel bar is 355 MPa, the fine adjustment distance achievable by the deformation of the elastic support rod alone is 0–0.35 mm (a larger range can be achieved by replacing with a material with better elasticity). Combined with the maximum elastic deformation of elastic body A and elastic body B, a fine adjustment range of >0.35 mm can be achieved. According to the pitch calculation, 0.35 mm corresponds to a rotation angle of 210° for the servo motor.

[0045] The formula for calculating the compensation amount δ for the misalignment of the support caused by a pair of inclined shims is δ≈Ltan(α), where L is the axial distance between the two inclined shims and α is the deflection angle of the inclined shims.

[0046] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for simulating impeller-casing friction with controllable friction parameters and initial rotor assembly state, characterized in that, It includes a controllable rubbing device with controllable parameters, a rotor blade system with adjustable initial assembly state, a front support system, a rear support system, and a base; The controllable friction device with controllable parameters includes a friction housing, a support frame, an L-shaped support plate, a servo motor, a lead screw, a lead screw sleeve, a first fixing bolt, a support plate, a support rod bolt, a fixing nut, a circular washer, a first clamping bolt, an elastic body A, a friction body fixing support plate, a second clamping bolt, a friction body, a second fixing bolt, and an elastic body B. The support frame is fixed to the base with anchor bolts. The friction housing and L-shaped support plate are fixed to the support frame with bolts. The servo motor is fixed to the L-shaped support plate with bolts and connected to the lead screw through a keyway, driving the lead screw to rotate. The lead screw is connected to the lead screw sleeve through a threaded connection. The lead screw sleeve is fixed to the support plate with a first fixing bolt. When the lead screw rotates, it undergoes axial displacement relative to the lead screw sleeve. The lead screw sleeve is fixed to the support plate with a first fixing bolt. The support plate is fixed to the friction housing with a support rod bolt, a fixing nut, and a circular washer. The friction body is fixed to the friction body fixing support plate with a second fixing bolt. The friction body fixing support plate is pressed against the support rod bolt with a first clamping bolt, a second clamping bolt, and an elastic body A. By selecting the thread length of the support rod bolt, the position of the friction body relative to the center line of the friction housing is adjusted, constituting a coarse adjustment. The lead screw presses against the friction body support plate through the elastic body B. When the lead screw rotates, the lead screw presses against the friction body, causing displacement and adjusting the position of the friction body relative to the center line of the friction housing, constituting a fine adjustment. The controllable friction device uses an elastic body, a fixed support plate for the friction body, and a lead screw to jointly control the elastic restoring force and damping of the friction body, thereby achieving control over the friction stiffness and damping; the elastic body includes a helical spring, metal rubber, or rubber. The fixed support plate for the rubbing body is equipped with an elastic support rod. The two ends of the fixed support plate are connected to the center position through the elastic support rod. Strain gauges are attached to the elastic support rod. The elastic support rod obtains the vibration response of the rubbing body during the rubbing process by attaching the strain gauges.

2. The bladed disk and casing rubbing simulation device with controllable rubbing parameters and initial rotor assembly state according to claim 1, characterized in that, The friction body is detachable, allowing for easy replacement with friction bodies of different arc lengths, thereby controlling the friction surface length and simulating single-point intermittent friction and continuous stable friction.

3. The bladed disk and casing rubbing simulation device with controllable rubbing parameters and initial rotor assembly state according to claim 1, characterized in that, The controllable rubbing device is arranged in multiple circumferential directions in the rubbing casing to simulate multi-point rubbing.

4. The bladed disk and casing rubbing simulation device with controllable rubbing parameters and rotor initial assembly state according to claim 1, characterized in that, The rotor blade system includes inclined shims or stacks, with multiple sets of inclined shims or stacks used simultaneously to simulate the required initial assembly state.

5. The bladed disk and casing rubbing simulation device with controllable rubbing parameters and rotor initial assembly state according to claim 1, characterized in that, The position of the rubbing body in the controllable rubbing device with controllable parameters is adjusted in two stages along the direction of movement of the rubbing body: the first stage is coarse adjustment, with a wide adjustment range, which initially adjusts the height of the rubbing body according to the blade height, or retains the initial gap between the blade and the rubbing body; the second stage is fine adjustment, which controls the gap or intrusion amount between the rubbing body and the blade in real time according to the rubbing needs at different speeds; the contact state of the connection interface in the rotor blade system with adjustable initial assembly state is adjusted by one inclined shim or stacked shim, or multiple overlapping inclined shims or stacked shims, to achieve control of the initial assembly state of the rotor and the tilt angle of the wheel disk inertial main shaft.

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