Turbine machinery foundation variable acceleration motion simulation test platform and motion simulation method

Abstract

The present invention discloses a variable acceleration motion simulation test platform for turbine machinery foundation, including a fixed seat, a positioning plate, an oscillation table, a base, an elastic support, and a power assembly. The base is fixed to the ground, and the oscillation table is arranged horizontally above the base at intervals. One side of the oscillation table is connected to the support seat on the base through a bearing, and the other side is connected to the upper surface of the base through an elastic support. The power assembly is installed on the base and connected to the side of the oscillation table close to the elastic support. The positioning plate and the fixed seat are arranged in sequence from bottom to top. The bottom surface of the positioning plate is connected to the upper surface of the oscillation table through bolt one, and the bottom surface of the fixed seat is connected to the upper surface of the positioning plate through bolt two. The turbine machinery is installed on the fixed seat through bolt three. A motion simulation method thereof is also provided. The present invention provides experimental test support for conducting research on the rotor dynamic characteristics of turbine machinery operating on the basis of variable acceleration.

Description

Technical Field

[0001] The invention relates to a testing device, in particular to a variable acceleration motion simulation testing platform and a motion simulation method for a turbine machinery foundation. Background Art

[0002] The rotor dynamics of a turbine machinery is an external representation of its operating conditions and internal flow. The operating conditions and internal flow performance can be analyzed, diagnosed, and maintained by in-situ online monitoring of its rotor dynamics to achieve efficient, stable, and safe operation of the turbine machinery and avoid major failures, especially major safety accidents. Turbine machinery operating in moving carriers such as rockets, satellites, aircraft, ships, and vehicles, or on abnormal foundations such as earthquakes, usually operates in a variable acceleration environment. This variable acceleration characteristic, on the one hand, will directly affect the motion state of the rotor system itself, and on the other hand, will cause an additional inertial force to be generated in the medium inside the turbine machinery, which exerts a responsive excitation force on the rotor system, thereby affecting the dynamic characteristics of the rotor system. In order to study the rotor dynamics of turbine machinery operating in this environment, it is necessary to establish a relevant simulation test platform.

[0003] At present, most of the test platforms for rotor dynamic characteristics are used to test the dynamic characteristics of turbine machinery rotor systems on stationary platforms, while the basic motion platforms are basically limited to dynamic measurements of simplified shaft-disc systems. In the field of turbine machinery, basic motion test platforms are still rare. There are test devices for testing the self-priming performance of self-priming pumps on elevators. However, there is no motion platform for testing the dynamic characteristics of turbine machinery rotors. Summary of the invention

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a turbine machinery basic variable acceleration motion simulation test platform to meet the turbine machinery rotor dynamic characteristics testing needs, and provide its motion simulation method.

[0005] Technical solution: A turbine machinery basic variable acceleration motion simulation test platform, including a fixed seat, a positioning plate, an oscillation table, a base, an elastic support, and a power assembly. The base is fixed to the ground, and the oscillation table is horizontally spaced above the base. One side of the oscillation table is connected to the support seat on the base through a bearing, and the other side is connected to the upper surface of the base through an elastic support. The power assembly is installed on the base and connected to the side of the oscillation table close to the elastic support. The positioning plate and the fixed seat are arranged in sequence from bottom to top, the bottom surface of the positioning plate is connected to the upper surface of the oscillation table through bolt one, the bottom surface of the fixed seat is connected to the upper surface of the positioning plate through bolt two, and the turbine machinery is installed on the fixed seat through bolt three.

[0006] Furthermore, the power assembly includes a flexible rope, a fixed pulley, and a low-frequency motor. The low-frequency motor is installed on a base. A hook is provided on one side of the oscillation table. The fixed pulley is provided between the hook and the low-frequency motor and obliquely above the low-frequency motor. The flexible rope is wrapped around the fixed pulley, one end of which is connected to the hook, and the other end is connected to the output turntable of the low-frequency motor.

[0007] Preferably, the fixed pulley is an eccentric pulley.

[0008] Furthermore, the positioning plate includes a circular plate and a channel steel. Two channel steels are fixed on the bottom surface of the circular plate in parallel and at intervals. The two channel steels are respectively fixed to the upper surface of the oscillation table by at least one bolt. Two pairs of positioning hole groups are provided on the circular plate. One pair includes two arc-shaped positioning holes 1 that are located on a concentric circle and are opposite to each other, and the other pair includes two arc-shaped positioning holes 2 that are located on another concentric circle and are opposite to each other. The arc-shaped positioning hole 2 is located outside the arc-shaped positioning hole 1.

[0009] Optimally, the wrap angle of arc-shaped positioning hole 1 is 110° to 115°, the wrap angle of arc-shaped positioning hole 2 is 120° to 125°, and the overlap angle of adjacent arc-shaped positioning hole 1 and arc-shaped positioning hole 2 in the circumferential direction is 25° to 30°.

[0010] Optimally, an annular positioning hole 1 and an annular positioning hole 2 are respectively opened at two opposite positions in the same direction on the fixing seat, the two annular positioning holes 1 are located on a concentric circle and are opened opposite to each other, the two annular positioning holes 2 are located on another concentric circle and are opened opposite to each other, annular positioning hole 2 is located outside annular positioning hole 1, annular positioning hole 1 has the same center diameter and width as arc-shaped positioning hole 1, and annular positioning hole 2 has the same center diameter and width as arc-shaped positioning hole 2.

[0011] Preferably, the base is fixed to the ground by anchor bolts.

[0012] Furthermore, the elastic support member is a spring, and the number of the spring is at least one. One end of the spring is connected to the upper surface of the base, and the other end is connected to the oscillation table.

[0013] Preferably, the bearing is a plain bearing.

[0014] A motion simulation method for the above-mentioned turbomachinery foundation variable acceleration motion simulation test platform comprises the following steps:

[0015] (a) define the coordinate system;

[0016] A rectangular coordinate system is established with the rotating axis of the turbine machinery as the x-axis. In this coordinate system, the motion of the turbine machinery along the three coordinates and the rotation around the three coordinate axes are defined as sway Swing Dangling Pitch roll Swing

[0017] (ii) Heave and pitch motion simulation;

[0018] The turbine machine to be tested is fixedly connected to the fixing seat by bolt 3, and the fixing seat is fixedly connected to the positioning plate by bolt 3, so that the x-axis of the turbine machine to be tested is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only two degrees of freedom, that is, the heave motion along the z-axis and the pitch motion around the x-axis;

[0019] (iii) Heave and roll motion simulation;

[0020] The turbine machine to be tested is fixedly connected to the fixing seat by bolt 3, and the fixing seat is fixedly connected to the positioning plate by bolt 3, so that the y-axis of the turbine machine to be tested is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only two degrees of freedom, that is, the vertical motion along the z-axis and the tumbling motion around the y-axis;

[0021] (iv) Heave, pitch and roll motion simulation;

[0022] The turbine machine to be tested is fixedly connected to the fixing seat by bolt 3, and the fixing seat is fixedly connected to the positioning plate by bolt 3, so that the angle between the y-axis of the turbine machine to be tested and the oscillation axis of the oscillation table, that is, the center line of the bearing, is an acute angle or an obtuse angle, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only three degrees of freedom, that is, the heave motion along the z-axis, the pitch motion around the x-axis, and the roll motion around the y-axis;

[0023] (V) Closed-loop simulation test;

[0024] For the aforementioned working conditions (ii), (iii) and (iv), for the medium requiring a closed circuit, a hose is used to implement the corresponding test simulation. The hoses are respectively a feed hose and a discharge hose, one end of each of which is connected to the turbine machine under test, and the other end is connected to a container containing the fluid medium.

[0025] Beneficial effects: Compared with the prior art, the advantages of the present invention are: the test platform can realize the test of the rotor dynamic characteristics of turbine machinery under variable acceleration, and can simulate the test of the rotor dynamic characteristics of turbine machinery running in moving carriers such as rockets and satellites, aircraft, ships, vehicles, or on abnormal foundations such as earthquakes. The oscillation amplitude and oscillation frequency of the turbine machinery foundation can be changed by adjustment, so as to realize the dynamic measurement of the turbine machinery under load conditions. By adjusting the installation position, the rotor dynamic characteristics test of turbine machinery heave, pitch and roll and two or more of the above-mentioned motion combinations can be realized. The platform has a simple structure, is safe, reliable, and has good robustness, and provides reliable experimental test support for conducting research on the rotor dynamic characteristics of turbine machinery running on the basis of variable acceleration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the positioning plate;

[0028] Figure 3 for Figure 2 AA section view;

[0029] Figure 4 It is a structural schematic diagram of a fixed seat;

[0030] Figure 5 for Figure 4 BB cross-sectional view;

[0031] Figure 6 Create a schematic diagram for the turbomachinery coordinate system;

[0032] Figure 7 It is a schematic diagram of simulation of heave and pitch conditions;

[0033] Figure 8 It is a schematic diagram of the simulation of heave and roll conditions;

[0034] Fig. 9 It is a schematic diagram of simulation of heave, pitch and roll conditions;

[0035] Fig.10 This is a closed-loop simulation schematic. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0037] A variable acceleration motion simulation test platform for turbomachinery foundations, such as Figures 1 to 5As shown, it includes a fixing seat 3, a positioning plate 5, an oscillating table 7, a base 9, an elastic support member 11, and a power assembly. The power assembly includes a flexible rope 12, a fixed pulley 13, and a low-frequency motor 14.

[0038] The base 9 is fixed to the ground by anchor bolts 10, and the oscillation table 7 is horizontally spaced above the base 9. One side of the oscillation table 7 is hinged to the support seat on the base 9 through a bearing 8. The bearing 8 is a sliding bearing, and the oscillation table 7 can rotate around the bearing 8. The other side of the oscillation table 7 is connected to the upper surface of the base 9 through an elastic support member 11. The elastic support member 11 is a spring, and there is at least one of them. One end of the spring is connected to the upper surface of the base 9, and the other end is connected to the oscillation table 7. At the same time, a hook is also provided on this side. A low-frequency motor 14 is installed on the base 9, and a fixed pulley 13 is arranged between the hook and the low-frequency motor 14 and obliquely above the low-frequency motor 14. A flexible rope 12 is wound around the fixed pulley 13, one end of which is connected to the hook, and the other end is connected to the output end turntable of the low-frequency motor 14. The fixed pulley 13 is an eccentric wheel.

[0039] The rotation of the low-frequency motor 14 drives the oscillation table 7 to oscillate up and down. The oscillation frequency can be changed by adjusting the rotational frequency of the low-frequency motor 14, and the amplitude can be changed by changing the position of the flexible rope 12 on the fixed pulley 13. Therefore, the test platform can adjust the oscillation amplitude and oscillation frequency of the turbine machinery 1 foundation.

[0040] The right side of the oscillation table 7 is elastically connected to the base 9 through a spring 11. The compressible length and the stretchable length of the spring 11 should be greater than the rotation radius of the flexible rope 12 on the turntable at the output end of the low-frequency motor 14. The spring 11 has both a vibration reduction effect and a fixing effect.

[0041] The positioning plate 5 and the fixing seat 3 are stacked on the oscillation table 7 from bottom to top in sequence, and the positioning plate 5 includes a circular plate 51 and a channel steel 52. Two channel steels 52 are fixed to the bottom surface of the circular plate 51 in parallel and at intervals. The two channel steels 52 are respectively fixed to the upper surface of the oscillation table 7 by at least one bolt 6. Two pairs of positioning hole groups are provided on the circular plate 51, one pair includes two arc-shaped positioning holes 511 located on a concentric circle and opened opposite to each other, and the other pair includes two arc-shaped positioning holes 512 located on another concentric circle and opened opposite to each other, and the arc-shaped positioning holes 512 are located on the outside of the arc-shaped positioning holes 511, the wrap angle of the arc-shaped positioning holes 511 is 110°~115°, the wrap angle of the arc-shaped positioning holes 512 is 120°~125°, and the overlapping angle of adjacent arc-shaped positioning holes 511 and arc-shaped positioning holes 512 in the circumferential direction is 25°~30°.

[0042] The bottom surface of the fixing seat 3 is connected to the upper surface of the positioning plate 5 by bolts 24, and an annular positioning hole 1 31 and an annular positioning hole 2 32 are respectively opened at two opposite positions in the same direction on the fixing seat 3, the two annular positioning holes 1 31 are located on a concentric circle and are opened opposite to each other, the two annular positioning holes 2 32 are located on another concentric circle and are opened opposite to each other, the annular positioning hole 2 32 is located on the outside of the annular positioning hole 1 31, the annular positioning hole 1 31 has the same central diameter and width as the arc-shaped positioning hole 1 511, and the annular positioning hole 2 32 has the same central diameter and width as the arc-shaped positioning hole 2 512, so the positioning plate 5 and the fixing seat 3 can achieve 360° steering positioning and fixing by bolts 24.

[0043] The turbine machine 1 is mounted on the fixing seat 3 by means of bolts 3 2, and the inlet and outlet of the turbine machine 1 can be connected to the storage device of the conveying medium through a hose. Because the linear amplitude is limited and the rotation angle is also limited, when the hose is connected, the flow of the medium in the hose is not hindered. Therefore, the test platform can realize the dynamic measurement of the turbine machine under load conditions.

[0044] The motion simulation method of the above-mentioned turbomachinery foundation variable acceleration motion simulation test platform is as follows: Figures 6 to 10 As shown, the following steps are included:

[0045] (a) define the coordinate system;

[0046] like Figure 6 As shown in the figure, a rectangular coordinate system is established with the rotating axis of the turbine machinery as the x-axis. In this coordinate system, the motion of the turbine machinery along the three coordinates and the rotation around the three coordinate axes are defined as sway Swing Dangling Pitch roll Swing

[0047] (ii) Heave and pitch motion simulation;

[0048] like Figure 7 As shown, the turbine machine under test is fixedly connected to the fixing seat by bolt three, and the fixing seat is fixedly connected to the positioning plate by bolt three. Four bolts two fall into the outer arc-shaped positioning hole two 512 with an angle of 120° to 125° on the positioning plate, so that the x-axis of the turbine machine under test is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing. The power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine under test has only two degrees of freedom of motion, namely, the vertical motion along the z-axis and the pitch motion around the x-axis.

[0049] (iii) Heave and roll motion simulation;

[0050] like Figure 8As shown, the turbine machine under test is fixedly connected to the fixing seat by bolt three, and the fixing seat is fixedly connected to the positioning plate by bolt three. Four bolts two fall into an arc-shaped positioning hole 511 on the inner side of the positioning plate with a wrap angle of 110° to 115°, so that the y-axis of the turbine machine under test is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing. The power component is turned on to make the oscillation table oscillate. At this time, the turbine machine under test has only two degrees of freedom of motion, namely, the vertical swing motion along the z-axis and the tumbling motion around the y-axis.

[0051] (iv) Heave, pitch and roll motion simulation;

[0052] like Fig. 9 As shown, the turbine machinery under test is fixedly connected to the fixing seat by bolt three, and the fixing seat is fixedly connected to the positioning plate by bolt three, two bolts 2 (a) fall into the arc-shaped positioning hole 1 511 on the inner side of the positioning plate with an angle of 110° to 115°, and the other two bolts 2 (b) fall into the arc-shaped positioning hole 2 512 on the outer side of the positioning plate with an angle of 120° to 125°, so that the angle between the y-axis of the turbine machinery under test and the oscillation axis of the oscillation table, that is, the center line of the bearing is an acute angle or an obtuse angle, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machinery under test has only three degrees of freedom of motion, namely, the vertical motion along the z-axis, the pitch motion around the x-axis and the tumbling motion around the y-axis.

[0053] (V) Closed-loop simulation test;

[0054] like Fig.10 As shown, for the aforementioned working conditions (ii), (iii) and (iv), for the medium requiring a closed circuit, a hose is used to implement the corresponding test simulation. The hoses are respectively a feed hose and a discharge hose, one end of each of which is connected to the turbine machine under test, and the other end is connected to a container containing the fluid medium.

Claims

1. A turbomachinery foundation variable acceleration motion simulation test platform, characterized by: The invention comprises a fixed seat (3), a positioning plate (5), an oscillating table (7), a base (9), an elastic support member (11), and a power assembly. The base (9) is fixed to the ground. The oscillating table (7) is arranged horizontally above the base (9) at intervals. One side of the oscillating table (7) is connected to a support seat on the base (9) through a bearing (8), and the other side is connected to the upper surface of the base (9) through an elastic support member (11). The power assembly is installed on the base (9) and connected to a side of the oscillating table (7) close to the elastic support member (11). The positioning plate (5) and the fixed seat (3) are arranged in sequence from bottom to top. The bottom surface of the positioning plate (5) is connected to the upper surface of the oscillating table (7) through a bolt 1 (6). The bottom surface of the fixed seat (3) is connected to the upper surface of the positioning plate (5) through a bolt 2 (4). The turbine machinery (1) is installed on the fixed seat (3) through a bolt 3 (2). The power assembly comprises a flexible rope (12), a fixed pulley (13), and a low-frequency motor (14). The low-frequency motor (14) is mounted on a base (9). A draw hook is arranged on one side of the oscillation table (7). The fixed pulley (13) is arranged between the draw hook and the low-frequency motor (14) and obliquely above the low-frequency motor (14). The flexible rope (12) is wound around the fixed pulley (13), one end of which is connected to the draw hook, and the other end is connected to the output end turntable of the low-frequency motor (14). The fixed pulley (13) is an eccentric wheel.

2. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 1 is characterized by: The positioning plate (5) comprises a circular plate (51) and a channel steel (52). Two channel steels (52) are fixed to the bottom surface of the circular plate (51) in parallel and at intervals. The two channel steels (52) are fixed to the upper surface of the oscillating table (7) by at least one bolt (6). Two pairs of positioning hole groups are provided on the circular plate (51), one pair of which comprises two arc-shaped positioning holes (511) located on a concentric circle and opened opposite to each other, and the other pair of which comprises two arc-shaped positioning holes (512) located on another concentric circle and opened opposite to each other, and the arc-shaped positioning holes (512) are located outside the arc-shaped positioning holes (511).

3. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 2 is characterized by: The wrap angle of the arc-shaped positioning hole 1 (511) is 110° to 115°, the wrap angle of the arc-shaped positioning hole 2 (512) is 120° to 125°, and the overlapping angle of the adjacent arc-shaped positioning hole 1 (511) and the arc-shaped positioning hole 2 (512) in the circumferential direction is 25° to 30°.

4. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 2 or 3, characterized in that: An annular positioning hole 1 (31) and an annular positioning hole 2 (32) are respectively formed at two opposite positions in the same direction on the fixing seat (3); the two annular positioning holes 1 (31) are located on a concentric circle and are formed opposite to each other; the two annular positioning holes 2 (32) are located on another concentric circle and are formed opposite to each other; the annular positioning hole 2 (32) is located outside the annular positioning hole 1 (31); the annular positioning hole 1 (31) and the arc-shaped positioning hole 1 (511) have the same central diameter and width; the annular positioning hole 2 (32) and the arc-shaped positioning hole 2 (512) have the same central diameter and width.

5. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 1, characterized in that: The base (9) is fixed to the ground via anchor bolts (10).

6. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 1, characterized in that: The elastic support member (11) is a spring, the number of which is at least one, one end of the spring is connected to the upper surface of the base (9), and the other end is connected to the oscillation table (7).

7. The turbomachinery foundation variable acceleration motion simulation test platform according to claim 1, characterized in that: The bearing (8) is a sliding bearing.

8. A motion simulation method for a turbomachinery foundation variable acceleration motion simulation test platform as claimed in any one of claims 1 to 3, characterized in that The following steps are involved: (a) define the coordinate system; A rectangular coordinate system is established with the rotating axis of the turbine machinery as the x-axis. In this coordinate system, the motion of the turbine machinery along the three coordinates and the rotation around the three coordinate axes are defined as sway Swing Dangling Pitch roll Swing (ii) Heave and pitch motion simulation; The turbine machine to be tested is fixedly connected to the fixing seat by bolt 3, and the fixing seat is fixedly connected to the positioning plate by bolt 3, so that the x-axis of the turbine machine to be tested is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only two degrees of freedom, that is, the heave motion along the z-axis and the pitch motion around the x-axis; (iii) Heave and roll motion simulation; The turbine machine to be tested is fixedly connected to the fixing seat by bolt 3, and the fixing seat is fixedly connected to the positioning plate by bolt 3, so that the y-axis of the turbine machine to be tested is parallel to the oscillation axis of the oscillation table, that is, the center line of the bearing, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only two degrees of freedom, that is, the vertical motion along the z-axis and the tumbling motion around the y-axis; (iv) Heave, pitch and roll motion simulation; The turbine machine to be tested is fixedly connected to the fixing seat by bolt three, and the fixing seat is fixedly connected to the positioning plate by bolt three, so that the angle between the y-axis of the turbine machine to be tested and the oscillation axis of the oscillation table, that is, the center line of the bearing, is an acute angle or an obtuse angle, and the power assembly is turned on to make the oscillation table oscillate. At this time, the turbine machine to be tested has only three degrees of freedom, that is, the heave motion along the z-axis, the pitch motion around the x-axis, and the roll motion around the y-axis; (V) Closed-loop simulation test; For the aforementioned working conditions (ii), (iii) and (iv), for the medium requiring a closed circuit, a hose is used to implement the corresponding test simulation. The hoses are respectively a feed hose and a discharge hose, one end of each of which is connected to the turbine machine under test, and the other end is connected to a container containing the fluid medium.

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