CN113188740B - Elastic beam nonlinear vibration testing platform - Google Patents
Elastic beam nonlinear vibration testing platform Download PDFInfo
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- CN113188740B CN113188740B CN202110465551.5A CN202110465551A CN113188740B CN 113188740 B CN113188740 B CN 113188740B CN 202110465551 A CN202110465551 A CN 202110465551A CN 113188740 B CN113188740 B CN 113188740B
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- elastic beam
- rotary table
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- crossed roller
- top plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
Abstract
The invention discloses a non-linear vibration test platform for an elastic beam, which comprises a platform body, crossed roller bearings, a rotary table and a motor, wherein the platform body is provided with a plurality of crossed roller bearings; the crossed roller bearing and the rotary table are arranged on a top plate of the table body from bottom to top; the bearing outer ring of the crossed roller bearing is fixed on the table body, the bearing inner ring of the crossed roller bearing is matched with the bottom end of the rotary table and the bearing outer ring and the rotary table are connected and fixed into a whole, so that the rotary table can freely rotate relative to the table body; the turntable is a table body with a hexagonal radial section, wherein three edges of a regular triangular prism are cut in the same volume along the axial direction of the turntable, an axial through hole is formed in the center of the turntable, and an upper elastic beam mounting hole and a lower elastic beam mounting hole which are arranged at intervals are formed in each cutting surface along the radial direction; the motor is fixed below the top plate of the table body, and the output shaft of the motor penetrates through a through hole formed in the top plate of the table body and is fixed in the axial through hole; the elastic beam nonlinear vibration testing platform is simple in structure and strong in operability, and effectively eliminates gap errors caused by a fixing mode in structural design, and improves the measuring efficiency.
Description
Technical Field
The invention relates to the technical field of mechanical vibration detection, in particular to an elastic beam nonlinear vibration testing platform.
Background
With the development of the mechanical industry, the problem of vibration suppression of flexible structural components is increasingly prominent. Once the flexible member is excited, because of the tiny structural damping, the vibration of the flexible member is difficult to stop in a short time, and because the vibration of the flexible member can cause resonance, the working precision and the service life of the whole product can be affected finally, so that the research on the vibration of the flexible member is a very practical subject.
Cantilever beam structures are widely applied from airplane propellers to cantilever cranes, but the structures have vibration problems when doing rotary motion, for example, in the mechanical industry, mechanical vibration is a common mechanical hazard which causes various losses and fault problems, and the vibration of the cantilever beam has large harm on engineering and needs to be solved in a rotating state. The vibration of the cantilever beam is continuous elastic vibration with a plurality of degrees of freedom and corresponding natural frequencies, and the vibration can be regarded as being formed by overlapping a plurality of main vibration modes. At present, the prior art does not have a design of a test bench for vibration measurement of a cantilever beam in a rotating state, and particularly detects vibration of cantilever beams made of different materials and having different lengths.
Disclosure of Invention
The invention aims to provide an elastic beam nonlinear vibration test platform which can regulate the speed in a large range and can simultaneously measure the vibration conditions of six elastic beams with the same diameter under the same constraint condition and the same excitation condition.
Therefore, the technical scheme of the invention is as follows:
a non-linear vibration test platform for an elastic beam comprises a platform body, a crossed roller bearing, a rotary table and a motor;
the crossed roller bearing and the rotary table are arranged on a top plate of the table body from bottom to top; the bearing outer ring of the crossed roller bearing is fixed on the table body, the bearing inner ring of the crossed roller bearing is matched with the bottom end of the rotary table and is connected and fixed with the bottom end of the rotary table into a whole, so that the rotary table can freely rotate relative to the table body;
the rotary table is a table body with a hexagonal radial section formed by cutting three edges of a regular triangular prism in an equal volume along the axial direction; an axial through hole is formed in the center of the rotary table, and an upper elastic beam mounting hole and a lower elastic beam mounting hole which are arranged at intervals are formed in the radial direction from the three cutting surfaces of the rotary table; the central axes of the upper elastic beam mounting hole and the lower elastic beam mounting hole on each cutting surface are positioned on the same vertical plane, the central axes of the upper elastic beam mounting holes are positioned on the same horizontal plane, and the central axes of the lower elastic beam mounting holes are positioned on the same horizontal plane; inner walls of the upper elastic beam mounting holes and the lower elastic beam mounting holes are provided with completely consistent internal threads, so that the end parts of the elastic beams are fixed in the mounting holes in a threaded connection mode;
the motor is fixed below the top plate of the table body, and the output shaft of the motor penetrates through a through hole formed in the top plate of the table body and is fixed in the axial through hole so as to drive the rotary table to rotate.
Furthermore, the table body is a frame structure with a rectangular axial section formed by sequentially connecting a top plate, a left side plate, a bottom plate and a right side plate, and a motor installation flat plate is arranged on the bottom surface of the top plate in parallel; the motor mounting plate is fixed on the top plate through bolts, and axial through holes communicated with each other are axially formed in the motor mounting plate and the top plate.
Furthermore, a lower gland is pressed at the lower side bearing outer ring of the crossed roller bearing and is fixed on the table body through a bolt; an upper gland is pressed and matched at the bearing inner ring at the upper side of the crossed roller bearing, and the upper gland is fixed at the bottom of the rotary table through bolts; the inner ring of the bearing is matched with the bottom end of the rotary table in a transition fit mode.
Furthermore, a plurality of strip-shaped through holes penetrating through the upper bottom surface and the lower bottom surface of the bottom plate are uniformly distributed on the bottom plate of the table body along the circumferential direction, and the strip-shaped through holes are arranged in a radial shape; this structural design only need when making stage body bottom plate be connected with the base with the contained angle between every hole measure accurate can, do not need the position size in every hole of accurate measurement, reduced the machining precision, nevertheless do not influence positioning accuracy and stability.
Further, the axial length L of each upper elastic beam mounting hole and each lower elastic beam mounting hole0And the length L of the elastic beam to be measured satisfies that: l is more than or equal to 0.05L0≤0.1L。
Compared with the prior art, the elastic beam nonlinear vibration test platform is simple in structure and strong in operability, and the whole structure is more compact so as to reduce unnecessary vibration; the turntable structure for fixing the elastic beam is provided with 6 elastic beam mounting holes with threads, so that the elastic beam and the turntable are connected and fixed into a whole in the same form through threads, the tightness is good, the turntable is convenient to disassemble, and gap errors caused by the conventional fixing mode of screws and nuts are effectively eliminated; meanwhile, six elastic beams of different materials and different lengths are measured under the same driving source, the vibration condition of the detected six elastic beams is measured under the condition of the same constraint, the measurement efficiency is improved, and possible result errors among different times of test measurement are avoided.
Drawings
FIG. 1 is a schematic structural diagram of a non-linear vibration testing platform for an elastic beam according to the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3(a) is a side view of a turntable of a sprung beam nonlinear vibration testing platform of the present invention;
FIG. 3(b) is a cross-sectional view T-T of FIG. 3 (a);
FIG. 3(c) is a top half-sectional view of a turntable of the sprung beam nonlinear vibration testing platform of the present invention;
FIG. 3(D) is a cross-sectional view taken along line D-D of FIG. 3 (c);
FIG. 4(a) is a top view of the bottom plate of the stage of the sprung beam nonlinear vibration testing platform of the present invention;
fig. 4(b) is a cross-sectional view of the bottom plate of the stage body of the elastic beam nonlinear vibration test stage according to the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
As shown in fig. 1, the elastic beam nonlinear vibration testing platform comprises a table body 1, a crossed roller bearing 2, a rotary table 3 and a motor 9; wherein, the first and the second end of the pipe are connected with each other,
the table body 1 is a frame structure with a rectangular axial section formed by sequentially connecting a top plate, a left side plate, a bottom plate and a right side plate, and a motor installation flat plate 4 is arranged on the bottom surface of the top plate in parallel; the motor installation flat plate 4 is fixed on the top plate through bolts, and axial through holes communicated with each other are axially formed in the motor installation flat plate 4 and the top plate; a plurality of strip-shaped through holes penetrating through the upper bottom surface and the lower bottom surface of the bottom plate are uniformly distributed on the bottom plate of the table body 1 along the circumferential direction, and the strip-shaped through holes are radially arranged;
the crossed roller bearing 2 is arranged on a top plate of the table body 1 from bottom to top; in particular, the amount of the solvent to be used,
a through hole is formed in the center of a top plate of the table body 1, and the inner diameter of the upper part of the through hole is larger than that of the lower part of the through hole, so that an annular step is formed at the diameter-variable part; the crossed roller bearing 2 is arranged at the upper part of the through hole and the lower bearing outer ring thereof is pressed and fitted at the annular step
A lower gland 7 is pressed at the bearing outer ring at the lower side of the crossed roller bearing 2, and the lower gland 7 is fixed on the table body 1 through a bolt; an upper gland 8 is pressed and matched at the bearing inner ring at the upper side of the crossed roller bearing 2, and the upper gland 8 is fixed at the bottom of the rotary table 3 through bolts, so that the rotary table 3 can freely rotate relative to the table body 1; wherein, the inner ring of the bearing is matched with the bottom end of the rotary table 3 in a transition fit mode;
the rotary table 3 is a table body with a hexagonal radial section, which is formed by cutting three edges of a regular triangular prism in an equal volume manner along the axial direction; an axial through hole 2a is formed in the center of the rotary table 3, and an upper elastic beam mounting hole 2b and a lower elastic beam mounting hole 2c which are arranged at intervals are formed in the radial direction from the three cutting surfaces of the rotary table; the central axes of the upper elastic beam mounting hole 2b and the lower elastic beam mounting hole 2c on each cutting surface are positioned on the same vertical plane, the central axes of the upper elastic beam mounting holes 2b are positioned on the same horizontal plane, and the central axes of the lower elastic beam mounting holes 2c are positioned on the same horizontal plane; inner threads are arranged on the inner walls of the upper elastic beam mounting holes 2b and the lower elastic beam mounting holes 2b, so that the end parts of the elastic beams are fixed in the mounting holes in a threaded connection mode; axial length L of each upper and lower spring beam mounting hole0And the length L of the elastic beam to be measured satisfies that: l is more than or equal to 0.05L0≤0.1L；
The motor 9 is fixed under the top plate of the table body 1, and the output shaft of the motor passes through a through hole arranged on the top plate of the table body 1 and is fixed in the axial through hole 2a so as to drive the rotary table 3 to rotate.
As a preferred technical solution of this embodiment, the elastic beam nonlinear vibration test platform further includes a PLC controller and a computer; the motor 9, the PLC and the computer are connected in sequence, so that the working state of the motor 9 can be adjusted by the computer and the PLC, and the motor can maintain the rotation motion or the swing motion set by the experiment according to the set rotation speed and the set rotation direction.
The use method of the elastic beam nonlinear vibration test platform is as follows:
connecting the elastic beam nonlinear vibration test platform with a base of a vibration tester through a bolt and a nut through a strip-shaped through hole on a bottom plate; respectively fixing one ends of N (N is 1-6) elastic beams to be tested with different materials and lengths in three upper elastic beam mounting holes 2b and three lower elastic beam mounting holes 2b of the rotary table, and respectively attaching sensor patches covered with a vibration tester to the other ends of the elastic beams; the driving mode of the motor 9 is set according to the experiment, the motor 9 is made to do rotary motion or swing motion consistent with the experimental design, and the motor 9 and the vibration tester can be started to synchronously measure the transverse vibration condition and the longitudinal vibration condition of the N elastic beams.
The elastic beam nonlinear vibration test platform of the embodiment is adopted to test six elastic beams:
(1) a Q235B type carbon steel rod, the length of which is 382 mm;
(2) a Q235B type carbon steel rod with the length of 482 mm;
(3) a Q235B type carbon steel rod, the length of which is 582 mm;
(4) a 45-type aluminum alloy rod, the length of which is 382 mm;
(5) a 45-type aluminum alloy rod having a length of 482 mm;
(6) a 45-type aluminum alloy rod, the length of which is 582 mm;
wherein, six connecting rods arrangement mode do: a382 mm long Q235B type carbon steel rod and a 582mm long 45 type aluminum alloy rod are connected to the same side of the turntable 3, a 482mm long Q235B type carbon steel rod and a 482mm long 45 type aluminum alloy rod are connected to the same side of the turntable 3, and a 582mm long Q235B type carbon steel rod and a 582mm long 45 type aluminum alloy rod are connected to the same side of the turntable 3.
Based on solidworks software, the gravity center of the rotating mechanism in the arrangement mode is calculated, and the calculation result is as follows:
1) before the six connecting rods are connected, the center position of the x direction is 0.000, the gravity center position of the y direction is-0.015 mm, and the gravity center position of the z direction is 270.540 mm.
2) After the six connecting rods are connected, the center position of the x direction is 1.829 mm, the center position of gravity of the y direction is-1.067 mm, and the center position of gravity of the z direction is 283.062 mm.
Through experimental verification, the elastic beam nonlinear vibration testing platform enables each elastic beam for synchronous testing to have small influence on the center in the x direction and the y direction, and the vibration caused by dynamic unbalance can be ignored when the rotary table does rotary motion, so that the influence on the experiment is extremely small.
Compared with the existing other single-row connection structures, the arrangement mode of the rotary table structure and the connection of the connecting rods can balance the dynamic unbalance phenomenon generated in the rotation process, the whole rigidity of the mechanism is high, the deformation resistance is good, and stable and accurate results can be obtained in the elastic beam nonlinear vibration experiment.
Claims (5)
1. The elastic beam nonlinear vibration test platform is characterized by comprising a platform body (1), a crossed roller bearing (2), a rotary table (3) and a motor (5); wherein the content of the first and second substances,
the crossed roller bearing (2) and the rotary table (3) are arranged on a top plate of the table body (1) from bottom to top; the bearing outer ring of the crossed roller bearing (2) is fixed on the table body (1), the bearing inner ring of the crossed roller bearing (2) is matched with the bottom end of the rotary table (3) and connected and fixed into a whole, so that the rotary table (3) can freely rotate relative to the table body (1);
the rotary table (3) is a table body with a hexagonal radial section, which is formed by cutting three edges of a regular triangular prism in an equal volume manner along the axial direction; an axial through hole (2a) is formed in the center of the rotary table (3), and upper elastic beam mounting holes (2b) and lower elastic beam mounting holes (2c) which are arranged at intervals are formed in the radial direction from the three cutting surfaces of the rotary table; the central axes of the upper elastic beam mounting hole (2b) and the lower elastic beam mounting hole (2c) on each cutting surface are positioned on the same vertical plane, the central axes of the upper elastic beam mounting holes (2b) are positioned on the same horizontal plane, and the central axes of the lower elastic beam mounting holes (2c) are positioned on the same horizontal plane; inner walls of the upper elastic beam mounting holes (2b) and the lower elastic beam mounting holes (2b) are provided with completely consistent internal threads, so that the end parts of the elastic beams can be fixed in the mounting holes in a threaded connection manner;
the motor (9) is fixed below the top plate of the table body (1), and the output shaft of the motor passes through a through hole formed in the top plate of the table body (1) and is fixed in the axial through hole (2a) so as to drive the rotary table (3) to rotate.
2. The elastic beam nonlinear vibration test platform according to claim 1, characterized in that the platform body (1) is a frame structure with a rectangular axial section formed by sequentially connecting a top plate, a left side plate, a bottom plate and a right side plate, and a motor mounting flat plate (4) is arranged on the bottom surface of the top plate in parallel; the motor installation flat plate (4) is fixed on the top plate through bolts, and axial through holes communicated with each other are axially formed in the motor installation flat plate (4) and the top plate.
3. The elastic beam nonlinear vibration test platform according to claim 1, characterized in that a lower gland (7) is press-fitted at the lower bearing outer ring of the crossed roller bearing (2), and the lower gland (7) is fixed on the platform body (1) through bolts; an upper gland (8) is pressed and matched at the bearing inner ring at the upper side of the crossed roller bearing (2), and the upper gland (8) is fixed at the bottom of the rotary table (3) through bolts; the inner ring of the bearing is matched with the bottom end of the rotary table (3) in a transition fit mode.
4. The elastic beam nonlinear vibration test platform according to claim 1, characterized in that a plurality of strip-shaped through holes penetrating through the upper and lower bottom surfaces of the bottom plate are uniformly distributed on the bottom plate of the platform body (1) along the circumferential direction, and the strip-shaped through holes are arranged in a radial manner.
5. The sprung beam nonlinear vibration test platform of claim 1, characterized in that the axial length L of each upper sprung beam mounting hole (2b) and each lower sprung beam mounting hole (2c)0And the length L of the elastic beam to be measured satisfies that: l is more than or equal to 0.05L0≤0.1L。
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| CN202110465551.5A CN113188740B (en) | 2021-04-28 | 2021-04-28 | Elastic beam nonlinear vibration testing platform |
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| CN202110465551.5A CN113188740B (en) | 2021-04-28 | 2021-04-28 | Elastic beam nonlinear vibration testing platform |
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| CN212553930U (en) * | 2020-08-14 | 2021-02-19 | 华南理工大学 | Vibration testing device for spring coupling rotating multi-body mechanical arm system |
| CN112432753A (en) * | 2020-11-10 | 2021-03-02 | 韶关学院 | Beam structure vibration fatigue device |
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2021
- 2021-04-28 CN CN202110465551.5A patent/CN113188740B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006325280A (en) * | 2005-05-17 | 2006-11-30 | Nippon Telegr & Teleph Corp <Ntt> | Preloader with output rigidity regulation mechanism of multi-degree-of-freedom ultrasonic motor |
| CN102678804A (en) * | 2012-05-10 | 2012-09-19 | 上海交通大学 | Sliding beam and spring combined nonlinear ultra-low frequency vibration isolator |
| CN203908663U (en) * | 2014-05-28 | 2014-10-29 | 西京学院 | Simple antifriction bearing vibration testing experiment table |
| CN104251764A (en) * | 2014-09-30 | 2014-12-31 | 清华大学 | Rolling bearing vibration detection device and analysis method |
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