AU2019429490A1 - Six-degree-of-freedom series-parallel electromagnetic vibration test stand - Google Patents
Six-degree-of-freedom series-parallel electromagnetic vibration test stand Download PDFInfo
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- AU2019429490A1 AU2019429490A1 AU2019429490A AU2019429490A AU2019429490A1 AU 2019429490 A1 AU2019429490 A1 AU 2019429490A1 AU 2019429490 A AU2019429490 A AU 2019429490A AU 2019429490 A AU2019429490 A AU 2019429490A AU 2019429490 A1 AU2019429490 A1 AU 2019429490A1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
A six-degree-of-freedom series-parallel electromagnetic vibration test stand, comprising a support base (1), a three-degree-of-freedom flexible support (2), an X-direction excitation device (3), a Y-direction excitation device (4), a Z-direction excitation device (5), a parallel linkage platform (6), a rotating device (7), a test workbench (8), and a controller (9). The X-direction excitation device (4) and the Y-direction excitation device (5) are configured to generate reciprocating vibration in an X direction and a Y direction, respectively; the Z-direction excitation device (5) can generate Z-direction reciprocating vibration and reciprocating swing around axes parallel to the X direction and the Y direction; the rotating device (7) is configured to drive the test workbench (8) to generate rotating or centrifugal movement. The test stand can achieve six degrees of freedom of vibration at most which are independent and adjustable, and has vibration test load, and low energy consumption and low equipment gravity center, thereby meeting requirements of more vibration test work.
Description
Field of the Invention
The present invention relates to the technical field of mechanical environmental testing equipment, and in particular, to a six-degree-of-freedom series-parallel electromagnetic vibration test stand.
Description of Related Art A vibration test stand is mainly used to simulate various impacts and vibrations to which a product is subjected during manufacturing, loading/unloading, assembly, transportation, and use, so as to determine product adaptability to various environmental vibrations and assess the integrity of its structural devices, providing a basis for testing of the product quality. The vibration test stand is required to make a series of controllable vibration simulations in a vibration experiment, to test whether the product can withstand the test from transportation or
vibration environment factors within its life cycle, and to further determine standards of design and function requirements for the vibration test stand. The vibration test stand is widely used in the research, development, quality control, and manufacturing in various industries such as aerospace, automotive, power electronics, optoelectronics, petrochemicals, toys, etc.. As the use environment varies and the requirement for simulation fidelity is raised, there is an increasingly high requirement for the degree of freedom of vibration of the test stand, and the demand for a vibration test stand achieving three or more degrees of freedom of vibration increasingly grows.
Existing vibration test devices are classified into mechanical vibration test stands and electromagnetic vibration test stands. Although having a simple structure and low cost, the existing mechanical vibration test stand has shortcomings such as a single vibration manner, low vibration frequency, and low acceleration. Moreover, the mechanical vibration test stand cannot use different vibration frequencies at the same time; and is unable to provide strong protection for the vibration device, posing a security threat to the vibration test stand and operators. Further, such a vibration test stand usually fails to control a vibration impact, affecting the test effect.
The electromagnetic vibration test stand is designed based on the electromagnetic induction principle, and has become widely-used mechanical environmental testing equipment due to its wide use frequency range and low waveform distortion. The electromagnetic vibration test stands widely used at present have a frequency which reaches up to 2000 Hz, and have a wide dynamic range, making it easy to implement automatic or manual control; and further have a desired acceleration waveform and suitably produce random waves, thus realizing large acceleration.
To solve some technical problems in the existing vibration test equipment, the existing patent documents propose some solutions. For example, Chinese patent application No. 201820909519.5 discloses a triaxial vibration fatigue test stand which is formed by a base, an X-direction workbench, a Y-direction workbench, and a Z-direction workbench. Powered by a hydraulic actuator, this test stand has high load, and can simulate a variety of road scenes by independent vibration or triaxial linkage of the X-direction, Y-direction, and Z-direction workbenches. Its shortcomings lie in that the vibration frequency is low and leakage easily occurs in a hydraulic system. Chinese patent application No. 201820196523.1 discloses a mechanical vibration test stand which is formed by a power box, a drive gear, a connecting piece, a spring, and other parts. This vibration test stand can use different vibration frequencies at the same time, but has a low excitation frequency and a small adjustment range. Chinese patent application No. 201810767591.3 discloses a test stand capable of active vibration control, which includes a base plate, two optical axes, a trestle located between the two optical axes, and an adjustable motor vibration device. Employing an inertial exciter, this test stand can only realize unidirectional vibration and thus is unable to simulate a vibration impact in complicated environments. Chinese patent application No. 201710127751.3 discloses a random vibration test stand, where a vibration platform is supported on a frame via a spring, and excitation devices are respectively disposed at the X, Y, and Z directions of the vibration platform. Random vibration is generated by acting on the vibration platform with a dowel steel, but only three degrees of freedom of vibration can be achieved and controllability of vibration in all directions is poor. Chinese patent application No. 201810013953.X discloses a test stand for a high-frequency-excitation grounding device, where its core part, a mechanical loading mechanism, is formed by a gantry frame assembly, a grounding device test chamber, a high-frequency electromagnetic exciter, and a suspending drive motor system assembly. This test stand employs the high-frequency electromagnetic exciter to excite vibration, but achieves few degrees of freedom of vibration. The existing three-degree-of-freedom electromagnetic vibration test stands mostly have an integral tandem structure, and realize vibration in the X, Y, and Z directions respectively by three parts disposed from bottom to top. Such a test stand has a large height and high energy consumption. In addition, the existing electromagnetic vibration test stands are mostly supported by using a cylindrical spring or leaf spring, or by suspension.
The existing electromagnetic vibration test stands have technical problems such as few degrees of freedom of vibration, an unreasonable support mode, poor controllability of vibration directions and parameters, and high energy consumption. As the requirements of vibration test objects on the vibration parameters of the vibration test stand are continuously raised, it is difficult for the existing vibration test stand to meet the needs of product vibration testing and research related to multi-degree-of-freedom excitation. Therefore, it is in urgent need to develop a multi-degree-of-freedom electromagnetic vibration test stand which achieves high test load, multiple degrees of freedom of vibration, high vibration frequency, vibration decoupling in all directions, and highly controllable vibration directions and parameters.
SUMMARY OF THE INVENTION For the shortcomings in the prior art, the present invention aims to provide a six-degree-of-freedom series-parallel electromagnetic vibration test stand capable of centrifugal movement, which can be applied in multi-degree-of-freedom high-frequency vibration test and research to achieve high load, multiple degrees of freedom of vibration, high vibration frequency, vibration decoupling in all directions, and highly controllable vibration directions and parameters, thus improving vibration test accuracy and reliability, reducing equipment and development costs, and overcoming the shortcomings in the prior art.
The technical problems to be solved by the present invention are resolved by the following technical solutions:
A six-degree-of-freedom series-parallel electromagnetic vibration test stand includes a support base, a three-degree-of-freedom flexible support, an X-direction excitation device, a Y-direction excitation device, a Z-direction excitation device, a parallel linkage platform, a rotating device, a test workbench, and a controller The support base includes a base, an
X-direction electromagnet support, and a Y-direction electromagnet support; and is configured to support and mount the three-degree-of-freedom flexible support, the X-direction excitation device, the Y-direction excitation device, and the Z-direction excitation device. A counterweight is disposed in the middle above the base and is fixedly connected to the base. There are two X-direction electromagnet supports and two Y-direction electromagnet supports, and both are symmetrically arranged at two sides on the top of the base. The X-direction electromagnet supports and the Y-direction electromagnet supports are fixedly connected to the base at the bottom. Four three-degree-of-freedom flexible supports are disposed between the base and the parallel linkage platform, and are configured to support and mount the parallel linkage platform. The three-degree-of-freedom flexible supports are capable of simultaneous elastic deformation in the X, Y, and Z directions; and are fixedly connected to the base at the lower ends and fixedly connected to the parallel linkage platform at the upper ends. The X-direction excitation device is located between the parallel linkage platform and the base. There are two X-direction excitation devices, which are symmetrically arranged at two sides above the base in an X direction and configured to drive the parallel linkage platform and the test workbench to generate X-direction reciprocating vibration. The Y-direction excitation device is located between the parallel linkage platform and the base. There are two Y-direction excitation devices, which are symmetrically arranged at two sides above the base in a Y direction and configured to drive the parallel linkage platform and the test workbench to generate Y-direction reciprocating vibration. The Z-direction excitation device is located between the parallel linkage platform and the base; and includes a first Z-direction electromagnet, a second Z-direction electromagnet, a first Z-direction attraction support, and a second Z-direction attraction support. The Z-direction excitation device is configured to drive the parallel linkage platform and the test workbench to generate Z-direction reciprocating vibration and reciprocating swing around axes parallel to the X direction and the Y direction. The two first Z-direction electromagnets are fixedly mounted at two sides above the base in the Y direction, respectively; and the two second Z-direction electromagnets are fixedly mounted at two sides above the base in the X direction, respectively. The first Z-direction attraction supports are located right above the first Z-direction electromagnets, and top portions thereof are fixedly mounted on the lower side of the parallel linkage platform. The second Z-direction attraction supports are located right above the second Z-direction electromagnets, and top portions thereof are fixedly mounted on the lower side of the parallel linkage platform. The rotating device is fixedly mounted on the parallel linkage platform at the lower end, and is configured to drive the test workbench to generate rotating or centrifugal movement. The test workbench fixedly mounted on the top of the rotating device is a final output terminal for generating vibration in the present invention, and is configured to carry or fixedly mount an object to be subjected to vibration test. The controller is connected to the X-direction excitation devices, the Y-direction excitation devices, the Z-direction excitation device, and the rotating device via a power cable or a signal cable.
Each three-degree-of-freedom flexible support includes a rigid bottom support, an X-direction deformation leaf spring, and a Y-direction deformation leaf spring. The rigid bottom support is fixedly mounted on the base at the lower end, and is configured to fix and mount the X-direction deformation leaf spring. The lower end of the X-direction deformation leaf spring is fixedly connected to the upper end of the rigid bottom support, the upper end of the X-direction deformation leaf spring is fixedly connected to the lower end of the Y-direction deformation leaf spring, and the upper end of the Y-direction deformation leaf spring is connected to the parallel linkage platform via screws. Driven by the X-direction excitation devices, the X-direction deformation leaf spring can enable the parallel linkage platform and the test workbench to generate X-direction reciprocating movement with respect to the support base. Driven by the Y-direction excitation devices, the Y-direction deformation leaf spring can enable the parallel linkage platform and the test workbench to generate Y-direction reciprocating movement with respect to the support base. Driven by the Z-direction excitation device, the X-direction deformation leaf spring and the Y-direction deformation leaf spring can further enable the parallel linkage platform and the test workbench to generate Z-direction reciprocating movement with respect to the support base. The X-direction deformation leaf spring is connected to the rigid bottom support at the lower end by hot riveting or via screws, and a joint therebetween is reinforced by friction stir welding. The upper end of the X-direction deformation leaf spring is connected to the lower end of the Y-direction deformation leaf spring by both hot riveting and friction stir welding. The X-direction deformation leaf spring and the Y-direction deformation leaf spring are both in vertical zigzag shape.
Each X-direction excitation device includes an X-direction attraction support, an X-direction electromagnet, an X-direction reset device, and an X-direction resetting support. The X-direction attraction support is fixedly connected to the parallel linkage platform at the top. The X-direction electromagnet is fixedly mounted at one side of the X-direction electromagnet support, and configured to attract the X-direction attraction support to provide power for the X-direction reciprocating vibration of the parallel linkage platform and the test workbench. The two ends of the X-direction reset device are fixedly connected to the X-direction attraction support and the X-direction resetting support respectively, to provide power for X-direction resetting of the parallel linkage platform and the test workbench. Each Y-direction excitation device includes a Y-direction attraction support, a Y-direction electromagnet, a Y-direction reset device, and a Y-direction resetting support. The Y-direction attraction support is fixedly connected to the parallel linkage platform at the top. The Y-direction electromagnet is fixedly mounted at one side of the Y-direction electromagnet support, and configured to attract the Y-direction attraction support to provide power for the Y-direction reciprocating vibration of the parallel linkage platform and the test workbench. The two ends of the Y-direction reset device are fixedly connected to the Y-direction attraction support and the Y-direction resetting support respectively, to provide power for Y-direction resetting of the parallel linkage platform and the test workbench. The X-direction resetting support and the Y-direction resetting support are bothfixedly connected to the base at the bottom.
The X-direction reset device includes an X-direction double universal joint, an X-direction reset spring, and an X-direction adjustment screw rod. The X-direction double universal joint is configured to connect the X-direction reset spring and the X-direction attraction support, and to enable the X-direction reset device to have freedom of movement in Y and Z directions. The X-direction double universal joint is connected to the X-direction attraction support at one end via a screw, and is connected to the X-direction reset spring at the other end via a screw. The X-direction reset spring is configured to provide power for X-direction resetting of the X-direction attraction support and the parallel linkage platform. The X-direction adjustment screw rod is connected to the X-direction reset spring at one end via a bolt and connected to the X-direction resetting support at the other end via a bolt; and is used to adjust the magnitude of a reset spring force of the X-direction reset spring.
The Y-direction reset device includes a Y-direction double universal joint, a Y-direction reset spring, and a Y-direction adjustment screw rod. The Y-direction double universal joint is configured to connect the Y-direction reset spring and the Y-direction attraction support, and to enable the Y-direction reset device to have freedom of movement in X and Z directions. The Y-direction double universal joint is connected to the Y-direction attraction support at one end via a screw, and is connected to the Y-direction reset spring at the other end via a screw. The Y-direction reset spring is configured to provide power for Y-direction resetting of the Y-direction attraction support and the parallel linkage platform. The Y-direction adjustment screw rod is connected to the Y-direction reset spring at one end via a bolt and connected to the Y-direction resetting support at the other end via a bolt; and is used to adjust the magnitude of a reset spring force of the Y-direction reset spring.
The rotating device includes a rotating base, a rotator, a ring gear, a drive gear, a transmission shaft, a transmission gear, a driving gear, and a rotating motor. The lower end of the rotating base is fixedly mounted on the upper side of the parallel linkage platform via screws, and is configured to support and mount the rotator. The rotator is disposed with a rotating flange at the upper end. The rotating flange is connected to the test workbench via screws, and the rotator is connected to the rotating base via a support bearing set. The ring gear is fixedly mounted inside the rotator via screws. The drive gear is fixedly mounted on the upper end of the transmission shaft and keeps internal meshing with ring gear; and is configured to drive the ring gear and the rotator to rotate. The transmission gear is fixedly mounted on the lower end of the transmission shaft. The transmission shaft is disposed in a transmission shaft mounting hole in the parallel linkage platform, and is connected to the parallel linkage platform via a bearing. An output shaft of the rotating motor is disposed in a motor mounting hole in the parallel linkage platform. The rotating motor is fixedly mounted on the parallel linkage platform via screws, and is configured to provide power for rotation of the driving gear, to drive the rotator to rotate with respect to the rotating base. The driving gear is fixedly mounted on the output shaft of the rotating motor and keeps external meshing with the transmission gear; and is configured to drive the transmission gear and the transmission shaft to rotate. The driving gear is connected to the output shaft of the rotating motor via a flat key. A shaft end ring is further disposed on the tail end of the output shaft of the rotating motor, and is fixedly connected to the output shaft of the rotating motor, to realize axial retaining.
An enclosure is disposed outside the support base, the three-degree-of-freedom flexible supports, and the Z-direction excitation device, where a handle is separately mounted on the front, back, left, and right sides of the enclosure. The controller of the present invention is connected to the X-direction electromagnet, the Y-direction electromagnet, the first Z-direction electromagnet, the second Z-direction electromagnet, and the rotating motor via the power cable and the signal cable.
Preferably, the support bearing set in the rotating device includes one radial bearing and two thrust bearings, where the two thrust bearings are disposed on the upper and lower ends of the radial bearing respectively. A cylindrical roller radial bearing or radial composite bearing is used as the radial bearing, and a cylindrical roller thrust bearing or axial composite bearing is used as the thrust bearing.
Preferably, a servo geared motor or hydraulic servo motor or pneumatic servo motor is used as the rotating motor in the rotating device.
During use, an object to be tested is placed or fixedly mounted in the test workbench. A degree of freedom of vibration and a specific vibration mode to be executed in the present invention are determined according to the requirements of the vibration test work; and then a working mode combining the X-direction excitation devices, the Y-direction excitation devices, the Z-direction excitation device, and the rotating device is selected. Driven by the X-direction excitation devices and the Y-direction excitation devices, the test workbench realizes linear reciprocating vibration in X and Y directions respectively. When the two first Z-direction electromagnets and the two second Z-direction electromagnets in the Z-direction excitation device synchronously work at the same time, the test workbench generates Z-direction reciprocating vibration. When the two second Z-direction electromagnets alternately work, the test workbench generates reciprocating swing around an axis parallel to the X direction; and when the two first Z-direction electromagnets alternately work, the test workbench generates reciprocating swing around an axis parallel to the Y direction. When the rotating motor is started, the test workbench can generate rotating or centrifugal movement around an axis of the ring gear. The present invention can achieve six degrees of freedom of movement at most: linear reciprocating vibration in X, Y, and Z directions; reciprocating swing around axes parallel to the X and Y directions; and rotation or centrifugal movement around an axis parallel to the Z direction. An eccentric distance of the test workbench relative to the rotating device and the parallel linkage platform can be adjusted by mounting the test workbench in different connecting bolt holes in the rotating flange of the rotating device. The degrees of freedom of vibration of the test workbench in the present invention are independent and adjustable, achieving complete decoupling.
Advantageous Effect
The present invention has the following advantageous effects: Compared to the prior art, the test workbench of the present invention achieves multiple degrees of freedom of vibration and has six degrees of freedom of movement; and further the degrees of freedom of vibration are independent and adjustable without mutual interference, thus meeting requirements of more vibration test work. Compared to the conventional vibration test stand of a tandem structure, the test workbench of the present invention further has outstanding features such as high load, low energy consumption, and low equipment gravity center. Moreover, the present invention also has advantageous such as a high vibration frequency, a compact structure, low space usage, low production cost, high safety, and easy operation and maintenance, thus overcoming the shortcomings in the prior art.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an overall structure (excluding a controller) of the present invention;
FIG. 2 is a schematic structural diagram of a bottom portion (excluding three-degree-of-freedom flexible supports) of the present invention;
FIG. 3 is a schematic structural diagram of an X-direction excitation device of the present invention;
FIG. 4 is a schematic structural diagram of a Y-direction excitation device of the present invention;
FIG. 5 is a schematic structural diagram of a parallel linkage platform of the present invention;
FIG. 6 is a schematic structural diagram of a rotating device of the present invention;
FIG. 7 is a schematic structural diagram showing eccentric mounting of a test workbench; and
FIG. 8 is a schematic diagram of a working status of the present invention.
DETAILED DESCRIPTION OF THE INVENTION In order to make it easy to understand the technical means, creative features, goals and effects achieved by the present invention, the present invention is further described below with reference to the specific embodiments and drawings.
As shown in FIGs. 1, 2, 5, 7, and 8, a six-degree-of-freedom series-parallel electromagnetic vibration test stand includes a support base 1, a three-degree-of-freedom flexible support 2, an X-direction excitation device 3, a Y-direction excitation device 4, a Z-direction excitation device 5, a parallel linkage platform 6, a rotating device 7, a test workbench 8, and a controller 9. The support base 1 includes a base 11, an X-direction electromagnet support 12, and a Y-direction electromagnet support 13; and is configured to support and mount the three-degree-of-freedom flexible support 2, the X-direction excitation device 3, the Y-direction excitation device 4, and the Z-direction excitation device 5. A counterweight 14 is disposed in the middle above the base 11 and is connected to the base 11 via a screw. There are two X-direction electromagnet supports 12 and two Y-direction electromagnet supports 13, and both are symmetrically arranged at two sides on the top of the base 11. The X-direction electromagnet supports 12 and the Y-direction electromagnet supports 13 are fixedly connected to the base 11 at the bottom by welding. Four three-degree-of-freedom flexible supports 2 are disposed between the base 11 and the parallel linkage platform 6, and are configured to support and mount the parallel linkage platform 6. The three-degree-of-freedom flexible supports 2 are capable of simultaneous elastic deformation in the X, Y, and Z directions; and are fixedly connected to the base 11 at the lower ends by welding or via screws and fixedly connected to the parallel linkage platform 6 at the upper ends via screws. The X-direction excitation device 3 is located between the parallel linkage platform 6 and the base 11. There are two X-direction excitation devices 3, which are symmetrically arranged at two sides above the base 11 in an X direction and configured to drive the parallel linkage platform 6 and the test workbench 8 to generate X-direction reciprocating vibration. The Y-direction excitation device 4 is located between the parallel linkage platform 6 and the base 11. There are two Y-direction excitation devices 4, which are symmetrically arranged at two sides above the base 11 in a Y direction and configured to drive the parallel linkage platform 6 and the test workbench 8 to generate Y-direction reciprocating vibration. The Z-direction excitation device 5 is located between the parallel linkage platform 6 and the base 11; and includes a first Z-direction electromagnet 51, a second Z-direction electromagnet 52, a first Z-direction attraction support 53, and a second Z-direction attraction support 54. The Z-direction excitation device 5 is configured to drive the parallel linkage platform 6 and the test workbench 8 to generate Z-direction reciprocating vibration and reciprocating swing around axes parallel to the X direction and the Y direction. There are two first Z-direction electromagnets 51, two second Z-direction electromagnets 52, two first Z-direction attraction supports 53, and two second Z-direction attraction supports 54. The two first Z-direction electromagnets 51 are fixedly mounted at two sides above the base
11 in the Y direction, respectively; and the two second Z-direction electromagnets 52 are fixedly mounted at two sides above the base 11 in the X direction, respectively. The first Z-direction attraction supports 53 are located right above the first Z-direction electromagnets 51, and top portions thereof are fixedly mounted on the lower side of the parallel linkage platform 6. The second Z-direction attraction supports 54 are located right above the second Z-direction electromagnets 52, and top portions thereof are fixedly mounted on the lower side of the parallel linkage platform 6. The rotating device 7 is fixedly mounted on the parallel linkage platform 6 at the lower end, and is configured to drive the test workbench 8 to generate rotating or centrifugal movement. The test workbench 8 fixedly mounted on the top of the rotating device 7 via screws is afinal output terminal for generating vibration in the present invention, and is configured to carry or fixedly mount an object to be subjected to vibration test. The controller 9 is connected to the X-direction excitation devices 3, the Y-direction excitation devices 4, the Z-direction excitation device 5, and the rotating device 7 via a power cable 91 or a signal cable 92.
As shown in FIGs. 1, 2, 3, 4, and 7, each three-degree-of-freedom flexible support 2 includes a rigid bottom support 21, an X-direction deformation leaf spring 22, and a Y-direction deformation leaf spring 23. The rigid bottom support 21 is fixedly mounted on the base 11 at the lower end and connected to the base 11 by welding or via screws; and is configured to fix and mount the X-direction deformation leaf spring 22. The lower end of the X-direction deformation leaf spring 22 is fixedly connected to the upper end of the rigid bottom support 21, the upper end of the X-direction deformation leaf spring 22 is fixedly connected to the lower end of the Y-direction deformation leaf spring 23, and the upper end of the Y-direction deformation leaf spring 23 is connected to the parallel linkage platform 6 via screws. Driven by the X-direction excitation devices 3, the X-direction deformation leaf spring 22 can enable the parallel linkage platform 6 and the test workbench 8 to generate X-direction reciprocating movement with respect to the support base 1. Driven by the Y-direction excitation devices 4, the Y-direction deformation leaf spring 23 can enable the parallel linkage platform 6 and the test workbench 8 to generate Y-direction reciprocating movement with respect to the support base 1. Driven by the Z-direction excitation device 5, the X-direction deformation leaf spring 22 and the Y-direction deformation leaf spring 23 can further enable the parallel linkage platform 6 and the test workbench 8 to generate Z-direction reciprocating movement with respect to the support base 1. The X-direction deformation leaf spring 22 is connected to the rigid bottom support 21 at the lower end by hot riveting or via screws, and a joint therebetween is reinforced by friction stir welding. The upper end of the X-direction deformation leaf spring 22 is connected to the lower end of the Y-direction deformation leaf spring 23 by both hot riveting and friction stir welding. The X-direction deformation leaf spring 22 and the Y-direction deformation leaf spring 23 are both in vertical zigzag shape.
As shown in FIGs. 1, 2, 3, 4, 5, and 7, each X-direction excitation device 3 includes an X-direction attraction support 31, an X-direction electromagnet 32, an X-direction reset device 33, and an X-direction resetting support 34. The X-direction attraction support 31 is fixedly connected to the parallel linkage platform 6 at the top by welding. The X-direction electromagnet 32 is fixedly mounted at one side of the X-direction electromagnet support 12, and configured to attract the X-direction attraction support 31 to provide power for the X-direction reciprocating vibration of the parallel linkage platform 6 and the test workbench 8. The two ends of the X-direction reset device 33 are fixedly connected to the X-direction attraction support 31 and the X-direction resetting support 34 respectively, to provide power for X-direction resetting of the parallel linkage platform 6 and the test workbench 8. Each Y-direction excitation device 4 includes a Y-direction attraction support 41, a Y-direction electromagnet 42, a Y-direction reset device 43, and a Y-direction resetting support 44. The Y-direction attraction support 41 is fixedly connected to the parallel linkage platform 6 at the top by welding. The Y-direction electromagnet 42 is fixedly mounted at one side of the Y-direction electromagnet support 13, and configured to attract the Y-direction attraction support 41 to provide power for the Y-direction reciprocating vibration of the parallel linkage platform 6 and the test workbench 8. The two ends of the Y-direction reset device 43 are fixedly connected to the Y-direction attraction support 41 and the Y-direction resetting support 44 respectively, to provide power for Y-direction resetting of the parallel linkage platform 6 and the test workbench 8. The X-direction resetting support 34 and the Y-direction resetting support 44 are both fixedly connected to the base 11 by welding at the bottom.
As shown in FIGs. 1, 2, 3, 5, and 7, the X-direction reset device 33 includes an X-direction double universal joint 331, an X-direction reset spring 332, and an X-direction adjustment screw rod 333. The X-direction double universal joint 331 is configured to connect the X-direction reset spring 332 and the X-direction attraction support 31, and to enable the X-direction reset device 33 to have freedom of movement in Y and Z directions. The X-direction double universal joint 331 is connected to the X-direction attraction support 31 at one end via a screw, and is connected to the X-direction reset spring 332 at the other end via a screw. The X-direction reset spring 332 is configured to provide power for X-direction resetting of the X-direction attraction support 31 and the parallel linkage platform 6. The X-direction adjustment screw rod 333 is connected to the X-direction reset spring 332 at one end via a bolt and connected to the X-direction resetting support 34 at the other end via a bolt; and is used to adjust the magnitude of a reset spring force of the X-direction reset spring 332.
As shown in FIGs. 1, 2, 4, 5, and 7, the Y-direction reset device includes a Y-direction double universal joint, a Y-direction reset spring, and a Y-direction adjustment screw rod. The Y-direction double universal joint 431 is configured to connect the Y-direction reset spring 432 and the Y-direction attraction support 41, and to enable the Y-direction reset device 43 to have freedom of movement in X and Z directions. The Y-direction double universal joint 431 is connected to the Y-direction attraction support 41 at one end via a screw, and is connected to the Y-direction reset spring 432 at the other end via a screw. The Y-direction reset spring 432 is configured to provide power for Y-direction resetting of the Y-direction attraction support 41 and the parallel linkage platform 6. The Y-direction adjustment screw rod 433 is connected to the Y-direction reset spring 432 at one end via a bolt and connected to the Y-direction resetting support 44 at the other end via a bolt; and is used to adjust the magnitude of a reset spring force of the Y-direction reset spring 432.
As shown in FIGs. 1, 5, 6, 7, and 8, the rotating device 7 includes a rotating base 71, a rotator 72, a ring gear 73, a drive gear 74, a transmission shaft 75, a transmission gear 76, a driving gear 77, and a rotating motor 78. The lower end of the rotating base 71 is fixedly mounted on the upper side of the parallel linkage platform 6 via screws, and is configured to support and mount the rotator 72. The rotator 72 is disposed with a rotating flange 721 at the upper end. The rotating flange 721 is connected to the test workbench 8 via screws, and the rotator 72 is connected to the rotating base 71 via a support bearing set. The ring gear 73 is fixedly mounted inside the rotator 72 via screws. The drive gear 74 is fixedly mounted on the upper end of the transmission shaft 75 and keeps internal meshing with the ring gear 73; and is configured to drive the ring gear 73 and the rotator 72 to rotate. The transmission gear 76 is fixedly mounted on the lower end of the transmission shaft 75. The transmission shaft 75 is disposed in a transmission shaft mounting hole 61 in the parallel linkage platform 6, and is connected to the parallel linkage platform 6 via a bearing. An output shaft of the rotating motor 78 is disposed in a motor mounting hole 62 in the parallel linkage platform 6. The rotating motor 78 is fixedly mounted on the parallel linkage platform 6 via screws, and is configured to provide power for rotation of the driving gear 77, to drive the rotator 72 to rotate with respect to the rotating base 71. The driving gear 77 is fixedly mounted on the output shaft of the rotating motor 78 and keeps external meshing with the transmission gear 76; and is configured to drive the transmission gear 76 and the transmission shaft 75 to rotate. The driving gear 77 is connected to the output shaft of the rotating motor 78 via a flat key. A shaft end ring is further disposed on the tail end of the output shaft of the rotating motor 78, and is fixedly connected to the output shaft of the rotating motor 78, to realize axial retaining.
As shown in FIGs. 1, 2, 7, and 8, an enclosure 15 is disposed outside the support base 1, the three-degree-of-freedom flexible supports 2, and the Z-direction excitation device 5, where a handle 16 is separately mounted on the front, back, left, and right sides of the enclosure. The controller 9 of the present invention is connected to the X-direction electromagnet 32, the Y-direction electromagnet 42, the first Z-direction electromagnet 51, the second Z-direction electromagnet 52, and the rotating motor 78 via the power cable 91 and the signal cable 92.
In a further technical solution, the support bearing set in the rotating device 7 includes one radial bearing and two thrust bearings, where the two thrust bearings are disposed on the upper and lower ends of the radial bearing respectively. A cylindrical roller radial bearing or radial composite bearing is used as the radial bearing, and a cylindrical roller thrust bearing or axial composite bearing is used as the thrust bearing.
In a further technical solution, a servo geared motor or hydraulic servo motor or pneumatic servo motor is used as the rotating motor 78 in the rotating device 7.
During use, an object to be tested is placed or fixedly mounted in the test workbench 8. A degree of freedom of vibration and a specific vibration mode to be executed in the present invention are determined according to the requirements of the vibration test work; and then a working mode combining the X-direction excitation devices 3, the Y-direction excitation devices 4, the Z-direction excitation device 5, and the rotating device 7 is selected. Driven by the X-direction excitation devices 3 and the Y-direction excitation devices 4, the test workbench 8 realizes linear reciprocating vibration in X and Y directions respectively. When the two first Z-direction electromagnets 51 and the two second Z-direction electromagnets 52 in the Z-direction excitation device 5 synchronously work at the same time, the test workbench 8 generates Z-direction reciprocating vibration. When the two second Z-direction electromagnets 52 alternately work, the test workbench 8 generates reciprocating swing around an axis parallel to the X direction; and when the two first Z-direction electromagnets
51 alternately work, the test workbench 8 generates reciprocating swing around an axis parallel to the Y direction. When the rotating motor 78 is started, the test workbench 8 can generate rotating or centrifugal movement around an axis of the ring gear 73. The present invention can achieve six degrees of freedom of movement at most: linear reciprocating vibration in X, Y, and Z directions; reciprocating swing around axes parallel to the X and Y directions; and rotation or centrifugal movement around an axis parallel to the Z direction. An eccentric distance of the test workbench 8 relative to the rotating device 7 and the parallel linkage platform 6 can be adjusted by mounting the test workbench 8 in different connecting bolt holes in the rotating flange 721 of the rotating device 7. The degrees of freedom of vibration of the test workbench 8 in the present invention are independent and adjustable, achieving complete decoupling.
In the description of the present invention, it should be noted that, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only used for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the denoted device or element must have a specific orientation or be constructed and operated in a specific orientation. Therefore, these terms cannot be understood as limitations to the present invention.
The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the foregoing embodiments, and the foregoing description in the embodiments and the specification are merely for explaining the principle of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and these changes and improvements all fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims (6)
1. A six-degree-of-freedom series-parallel electromagnetic vibration test stand, comprising a
support base, a three-degree-of-freedom flexible support, an X-direction excitation device, a
Y-direction excitation device, a Z-direction excitation device, a parallel linkage platform, a
rotating device, a test workbench, and a controller; wherein the support base comprises a base,
an X-direction electromagnet support, and a Y-direction electromagnet support; a
counterweight is disposed in the middle above the base; there are two X-direction
electromagnet supports and two Y-direction electromagnet supports, and both are
symmetrically arranged at two sides on the top of the base; the X-direction electromagnet
supports and the Y-direction electromagnet supports are fixedly connected to the base at the
bottom; four three-degree-of-freedom flexible supports capable of simultaneous elastic
deformation in the X, Y, and Z directions are disposed between the base and the parallel
linkage platform, and are fixedly connected to the base at the lower ends and fixedly
connected to the parallel linkage platform at the upper ends; the X-direction excitation device
is located between the parallel linkage platform and the base, and there are two X-direction
excitation devices, which are symmetrically arranged at two sides above the base in an X
direction; the Y-direction excitation device is located between the parallel linkage platform
and the base, and there are two Y-direction excitation devices, which are symmetrically
arranged at two sides above the base in a Y direction; the rotating device is fixedly mounted
on the parallel linkage platform at the lower end, and the test workbench isfixedly mounted
on the top of the rotating device via screws; and the controller is connected to the X-direction
excitation devices, the Y-direction excitation devices, the Z-direction excitation device, and
the rotating device via a power cable or a signal cable;
each X-direction excitation device comprises an X-direction attraction support, an X-direction
electromagnet, an X-direction reset device, and an X-direction resetting support; the
X-direction attraction support is fixedly connected to the parallel linkage platform at the top;
the X-direction electromagnet is fixedly mounted at one side of the X-direction electromagnet
support; the two ends of the X-direction reset device are fixedly connected to the X-direction attraction support and the X-direction resetting support respectively; each Y-direction excitation device comprises a Y-direction attraction support, a Y-direction electromagnet, a
Y-direction reset device, and a Y-direction resetting support; the Y-direction attraction support
is fixedly connected to the parallel linkage platform at the top; the Y-direction electromagnet
is fixedly mounted at one side of the Y-direction electromagnet support; the two ends of the
Y-direction reset device are fixedly connected to the Y-direction attraction support and the
Y-direction resetting support respectively; and the X-direction resetting support and the
Y-direction resetting support are both fixedly connected to the base at bottom;
the Z-direction excitation device is located between the parallel linkage platform and the base;
and comprises two first Z-direction electromagnets, two second Z-direction electromagnets,
two first Z-direction attraction supports, and two second Z-direction attraction supports; the
two first Z-direction electromagnets are fixedly mounted at two sides above the base in the Y
direction, respectively; and the two second Z-direction electromagnets are fixedly mounted at
two sides above the base in the X direction, respectively; the first Z-direction attraction
supports are located right above the first Z-direction electromagnets, and top portions of
thereof are fixedly mounted on the lower side of the parallel linkage platform; the second
Z-direction attraction supports are located right above the second Z-direction electromagnets,
and top portions thereof are fixedly mounted on the lower side of the parallel linkage
platform;
the rotating device comprises a rotating base, a rotator, a ring gear, a drive gear, a
transmission shaft, a transmission gear, a driving gear, and a rotating motor; the lower end of
the rotating base is fixedly mounted on the upper side of the parallel linkage platform, and the
rotator is disposed with a rotating flange at the upper end; the rotating flange is connected to
the test workbench via screws, and the rotator is connected to the rotating base via a support
bearing set; the ring gear is fixedly mounted inside the rotator via screws, and the drive gear is
fixedly mounted on the upper end of the transmission shaft and keeps internal meshing with
the ring gear; the transmission gear is fixedly mounted on the lower end of the transmission
shaft; the transmission shaft is disposed in a transmission shaft mounting hole in the parallel
linkage platform, and is connected to the parallel linkage platform via a bearing, an output shaft of the rotating motor is disposed in a motor mounting hole in the parallel linkage platform and the rotating motor is fixedly mounted on the parallel linkage platform via screws; the driving gear is fixedly mounted on the output shaft of the rotating motor and keeps external meshing with the transmission gear; the driving gear is connected to the output shaft of the rotating motor via a flat key; and a shaft end ring is further disposed on the tail end of the output shaft of the rotating motor, and is fixedly connected to the output shaft of the rotating motor.
2. The six-degree-of-freedom series-parallel electromagnetic vibration test stand according to
claim 1, wherein each three-degree-of-freedom flexible support comprises a rigid bottom
support, an X-direction deformation leaf spring, and a Y-direction deformation leaf spring; the
rigid bottom support is fixedly mounted on the base at the lower end; the lower end of the
X-direction deformation leaf spring is fixedly connected to the upper end of the rigid bottom
support, the upper end of the X-direction deformation leaf spring is fixedly connected to the
lower end of the Y-direction deformation leaf spring, and the upper end of the Y-direction
deformation leaf spring is connected to the parallel linkage platform via bolts; and the
X-direction deformation leaf spring and the Y-direction deformation leaf spring are both in
vertical zigzag shape.
3. The six-degree-of-freedom series-parallel electromagnetic vibration test stand according to
claim 2, wherein the X-direction deformation leaf spring is connected to the rigid bottom
support at the lower end by hot riveting or via screws, and a joint therebetween is reinforced
by friction stir welding; and the upper end of the X-direction deformation leaf spring is
connected to the lower end of the Y-direction deformation leaf spring by both hot riveting and
friction stir welding.
4. The six-degree-of-freedom series-parallel electromagnetic vibration test stand according to
claim 1, wherein the support bearing set comprises one radial bearing and two thrust bearings;
the two thrust bearings are disposed on the upper and lower ends of the radial bearing
respectively; and a cylindrical roller radial bearing or radial composite bearing is used as the
radial bearing, and a cylindrical roller thrust bearing or axial composite bearing is used as the
thrust bearing.
5. The six-degree-of-freedom series-parallel electromagnetic vibration test stand according to
claim 1, wherein a servo geared motor or hydraulic servo motor or pneumatic servo motor is
used as the rotating motor.
6. The six-degree-of-freedom series-parallel electromagnetic vibration test stand according to
claim 1, wherein the X-direction reset device comprises an X-direction double universal joint,
an X-direction reset spring, and an X-direction adjustment screw rod; the X-direction double
universal joint is connected to the X-direction attraction support at one end via a screw, and is
connected to the X-direction reset spring at the other end via a screw; the X-direction
adjustment screw rod is connected to the X-direction reset spring at one end via a bolt and
connected to the X-direction resetting support at the other end via a bolt; the Y-direction reset
device comprises a Y-direction double universal joint, a Y-direction reset spring, and a
Y-direction adjustment screw rod; the Y-direction double universal joint is connected to the
Y-direction attraction support at one end via a screw, and is connected to the Y-direction reset
spring at the other end via a screw; the Y-direction adjustment screw rod is connected to the
Y-direction reset spring at one end via a bolt and connected to the Y-direction resetting
support at the other end via a bolt.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910113055.6 | 2019-02-13 | ||
| CN201910113055.6A CN109682564B (en) | 2019-02-13 | 2019-02-13 | Six-degree-of-freedom series-parallel electromagnetic vibration test bed |
| PCT/CN2019/083420 WO2020164186A1 (en) | 2019-02-13 | 2019-04-19 | Six-degree-of-freedom series-parallel electromagnetic vibration test stand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2019429490A1 true AU2019429490A1 (en) | 2020-12-24 |
| AU2019429490B2 AU2019429490B2 (en) | 2021-08-26 |
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ID=66195505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2019429490A Active AU2019429490B2 (en) | 2019-02-13 | 2019-04-19 | Six-degree-of-freedom series-parallel electromagnetic vibration test stand |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN109682564B (en) |
| AU (1) | AU2019429490B2 (en) |
| WO (1) | WO2020164186A1 (en) |
| ZA (1) | ZA202007410B (en) |
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| CN110961334B (en) * | 2019-11-29 | 2021-04-16 | 黄辉 | Novel inertia vibration exciter |
| CN110895185B (en) * | 2019-12-05 | 2024-04-12 | 湖南农业大学 | Vibration testing platform for seed metering performance of universal seed metering device |
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| CN111912592A (en) * | 2020-07-31 | 2020-11-10 | 上海卫星工程研究所 | Staring camera micro-vibration test equipment and method |
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| CN112710449A (en) * | 2020-12-17 | 2021-04-27 | 北京苏试创博环境可靠性技术有限公司 | Horizontal excitation test device, combination thereof and installation method of horizontal excitation test device |
| CN112908502B (en) * | 2021-01-27 | 2022-11-15 | 中国核动力研究设计院 | Spring plate type horizontal and vertical bidirectional excitation decoupling device |
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- 2019-02-13 CN CN201910113055.6A patent/CN109682564B/en active Active
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- 2019-04-19 WO PCT/CN2019/083420 patent/WO2020164186A1/en active Application Filing
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2020
- 2020-11-27 ZA ZA2020/07410A patent/ZA202007410B/en unknown
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| ZA202007410B (en) | 2022-04-28 |
| AU2019429490B2 (en) | 2021-08-26 |
| WO2020164186A1 (en) | 2020-08-20 |
| CN109682564A (en) | 2019-04-26 |
| CN109682564B (en) | 2023-07-25 |
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