Horizontal swinging multi-angle low-frequency vibration generating device

Abstract

The invention provides a horizontally-swinging multi-angle low-frequency vibration generation device, and belongs to the technical field of acceleration sensor detection devices. A base is provided with a sliding connecting frame, the connecting frame is provided with a rotating frame, the rotating frame is provided with a comparison frame, and the comparison frame is provided with a rotating table. One end of the rotating frame is rotatably connected with one side of the connecting frame, the other end of the rotating frame is rotatably connected with one end of a supporting frame, and the other end of the supporting frame is rotatably connected with a sliding block; a driving device is arranged at one end of the base and is in transmission connection with the connecting frame. Sinusoidal vibration in the horizontal direction is achieved through the stepping motor. The vibration in the horizontal direction can reduce the influence of the gravitational acceleration generated by the gravity, and achieves the purpose of testing a small-range acceleration sensor. The large amplitude is realized through the long stroke, so that the vibration acceleration can still reach the 0.01 g level under the low-frequency sinusoidal vibration, and the requirement of the lowest sensitivity of the tested sensor is met.

Description

Technical Field

[0001] The present invention relates to the technical field of acceleration sensor detection, and in particular to a multi-angle low-frequency vibration generating device with horizontal swing. Background Art

[0002] In the fields of aerospace, transportation, energy and electricity, industrial manufacturing, etc., it is necessary to test the working status of related products in low-frequency vibration environments, simulate the use scenarios of transportation or low-frequency operation of equipment, and ensure the stability and reliability of related products in low-frequency vibration environments.

[0003] Currently, some technologies have designed vibration generators based on the principles of electromagnetic induction, adjusting the vibration frequency and amplitude by controlling current and magnetic field parameters. This technology employs digital signal processing, high-precision sensors, and closed-loop control to monitor and stabilize low-frequency vibrations in real time. However, these products have a short working stroke, resulting in excessively low acceleration when generating low-frequency vibrations, making it difficult for the tested product to capture acceleration signals.

[0004] To address this technical shortcoming, a large-scale, low-frequency, low-resistance vibration test platform has been designed with a long travel range. By incorporating inertia chambers and flexible support technology, large-mass, low-frequency, and low-damping vibration testing is achieved. Vertical vibration is typically used. During vertical vibration, the accelerometer is subject to the force of gravity, resulting in a constant downward DC acceleration component g. When the accelerometer has a small range, the actual acceleration value can easily exceed the sensor's range during low-frequency vibration.

[0005] To this end, the National Institute of Metrology (NIM) has developed a laser absolute vibration calibration device. This device uses laser interferometry signal acquisition and mathematical models to accurately measure spatial motion trajectories, such as straight lines, circles, and ellipses. However, this technology can only simulate the performance of vibration sensors and cannot simulate potential problems encountered in actual testing.

[0006] Therefore, when measuring vibration signals at low frequencies below 1 Hz, the acceleration value is small, only a few mg. However, the test noise is large and the signal-to-noise ratio is low, which has a significant impact on accuracy and calibration. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-angle low-frequency vibration generating device that can generate a practical and controllable low-acceleration vibration signal at a low frequency of less than 1 Hz, and realize horizontal swing that can test the accuracy of low-frequency small-signal acceleration sensors, so as to solve at least one technical problem existing in the above-mentioned background technology.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention provides a horizontally oscillating multi-angle low-frequency vibration generating device, comprising:

[0010] Base; the base is provided with two parallel sliding rods; the two sliding rods are provided with a connecting frame that can slide along the sliding rods;

[0011] The connecting frame is provided with a rotating frame; a comparison frame is mounted on the rotating frame; and a rotating platform is provided on the comparison frame; wherein, one end of the rotating frame is rotatably connected to one side of the connecting frame, the other end of the rotating frame is rotatably connected to one end of the supporting frame, the other end of the supporting frame is rotatably connected to a slider, the slider is provided on a screw rod, and both ends of the screw rod are rotatably connected to the connecting frame;

[0012] A driving device is provided at one end of the base, and the driving device is transmission-connected to the connecting frame.

[0013] Furthermore, the base includes two cross beams respectively provided at two ends, two parallel longitudinal beams are connected between the two cross beams, and the two sliding rods are respectively provided on the two longitudinal beams.

[0014] Furthermore, the driving device is connected to a belt, and the belt is connected to the connecting frame.

[0015] Furthermore, a sliding rod connector is slidably provided on the sliding rod, and the connecting frame is connected to the sliding rod connector.

[0016] Furthermore, a blind hole is provided in the middle of the connecting frame, and end ears are provided at both ends of the blind hole, and the two ends of the screw rod are rotatably connected to the two end ears respectively.

[0017] Furthermore, one end of the screw rod is movably connected to a knob through an end ear.

[0018] Furthermore, the driving device is connected to one side of a beam through a fixing frame, and a supporting frame is provided on the other beam, and the supporting frame is provided with a rotating wheel connected to the belt.

[0019] Furthermore, the sliding rod connector includes a connecting block slidably arranged on the sliding rod, a gasket is provided on the connecting block, and the connecting block is connected to the connecting frame by bolts.

[0020] Furthermore, a connecting ear plate is provided on the side of the connecting frame, and corresponding threaded holes are provided on the connecting ear plate and the connecting block; the threaded connection between the connecting ear plate and the connecting block is achieved by bolts cooperating with the threaded holes.

[0021] Furthermore, the driving device is a stepping motor.

[0022] The beneficial effects of the present invention are as follows: horizontal sinusoidal vibration is achieved through a stepper motor. Vibration in the horizontal direction can reduce the influence of gravitational acceleration caused by centripetal force, thereby achieving the goal of testing small-range acceleration sensors. A large amplitude is achieved through a long stroke, so that under low-frequency sinusoidal vibration, the vibration acceleration can still reach the 0.01g level, meeting the minimum sensitivity requirement of the sensor being tested. The shock-absorbing effect of the belt, rubber pad and rubber sleeve filters out high-frequency vibration noise in the test, reducing the impact of noise on the experimental results. Through the coordination of the rotating disk and the rotating frame, the vibration test of measuring different axial accelerations of the vibration sensor can be realized with only one installation.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the following description, will become apparent from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a three-dimensional structural diagram of the horizontally oscillating multi-angle low-frequency vibration generating device according to an embodiment of the present invention.

[0026] Figure 2 This is a structural diagram of the rotating frame of the horizontally oscillating multi-angle low-frequency vibration generating device according to an embodiment of the present invention when it is in a horizontal state.

[0027] Figure 3 This is a structural diagram of the rotating frame of the horizontally oscillating multi-angle low-frequency vibration generating device according to an embodiment of the present invention when it is in a rotating and tilted state.

[0028] Figure 4 Schematic diagram of the working curve of the stepping motor according to an embodiment of the present invention.

[0029] Figure 5 Schematic diagram of the working process of the stepping motor according to an embodiment of the present invention.

[0030] Among them: 1-base; 2-slide rod; 3-connecting frame; 4-rotating frame; 5-comparison frame; 6-rotating table; 7-support frame; 8-slider; 9-screw rod; 10-driving device; 11-crossbeam; 12-longitudinal beam; 13-belt; 14-slide rod connector; 15-blind hole; 16-end ear; 17-knob; 18-fixing frame; 19-mounting frame; 20-connecting block; 21-gasket; 22-bolt; 23-connecting ear plate; 24-rubber sleeve; 25-support foot; 26-rotating shaft; 27-adapter plate; 28-rotating wheel. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention.

[0032] Those skilled in the art will understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs.

[0033] It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have a meaning consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless as defined herein.

[0034] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups thereof.

[0035] In the description of this specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless otherwise inconsistent.

[0036] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0037] In the description of this specification, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present technology.

[0038] Unless otherwise specified or limited, the terms "installed," "connected," "connected," and "disposed" should be understood broadly. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of these terms in this technology based on specific circumstances.

[0039] To facilitate understanding of the present invention, the present invention is further explained below with reference to specific embodiments in conjunction with the accompanying drawings. However, the specific embodiments do not constitute a limitation on the embodiments of the present invention.

[0040] Those skilled in the art should understand that the drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily necessary for implementing the present invention.

[0041] like Figures 1 to 3 As shown, in this embodiment, a horizontally oscillating multi-angle low-frequency vibration generating device is provided, comprising: a base 1; two parallel sliding rods 2 are provided on the base 1; a connecting frame 3 that can slide along the sliding rods 2 is provided on the two sliding rods 2; a rotating frame 4 is provided on the connecting frame 3; a comparison frame 5 is mounted on the rotating frame 4; and a rotating platform 6 is provided on the comparison frame 5. One end of the rotating frame 4 is rotatably connected to one side of the connecting frame 3, and the other end of the rotating frame 4 is rotatably connected to one end of a support frame 7. The other end of the support frame 7 is rotatably connected to a slider 8, and the slider 8 is provided on a screw rod 9, and both ends of the screw rod 9 are rotatably connected to the connecting frame 3. A driving device 10 is provided at one end of the base 1, and the driving device 10 is transmission-connected to the connecting frame 3. Driven by the driving device 10, the connecting frame 3 can slide back and forth along the sliding rods. The driving device 10 is a stepping motor.

[0042] The base 1 includes two cross beams 11 at both ends, two parallel longitudinal beams 12 are connected between the two cross beams 11, and the two slide bars 2 are respectively arranged on the two longitudinal beams 12. The bottom of the cross beam 11 is provided with a support foot 25 for supporting the cross beam 11.

[0043] Specifically, the driving device 10 is connected to a belt 13, and one side of the belt 13 is connected to the connecting frame 3. The belt 13 is driven to move by the driving device 10, and the movement of the belt 13 drives the connecting frame 3 to slide on the slide rod 2. Specifically, a slide rod connector 14 is slidably provided on the slide rod 2, and the connecting frame 3 is connected to the slide rod connector 14. A blind hole 15 is provided in the middle of the connecting frame 3, and end ears 16 are provided at both ends of the blind hole 15. The two ends of the screw rod 9 are rotatably connected to the two end ears 16 respectively. One end of the screw rod 9 is movably connected to a knob 17 through an end ear 16. The screw rod 9 is rotated by turning the knob 17, and the rotation of the screw rod 9 drives the slider 8 to move along the screw rod, and the movement of the slider 8 drives the rotating frame 4 to rotate through the support frame 7. As shown Figure 2 As shown, when the knob 17 is rotated to make the slider located at the rightmost end of the screw, the rotating frame 4 is parallel to the connecting frame and is in a horizontal state; Figure 3 As shown, specifically, when the knob 17 is rotated to move the slider away from the rightmost end of the lead screw toward the left end, the left end of the rotating frame 4 rotates relative to the connecting frame, and the right end of the rotating frame is tilted. A rotating shaft 26 is provided on both sides of one end of the connecting frame 3. An adapter plate 27 rotatably connected to the rotating shaft 26 is provided on the rotating frame corresponding to the rotating shaft 26. When the support frame 7 reciprocates along the lead screw under the action of the slider 8, one side of the rotating frame 4 rotates about the rotating shaft 26. The two ends of the support frame 7 are rotatably connected to the lower surface of the rotating frame 4 and the slider 8, respectively, for example, via a pivot connection.

[0044] The drive device 10 is connected to one side of a crossbeam 11 via a fixing bracket 18. A mounting bracket 19 is provided on the other crossbeam 11. The mounting bracket 19 is provided with a rotating pulley 28 connected to the belt 13. The slide bar connector 14 includes a connecting block 20 that slides onto the slide bar 2. The connecting block 20 is provided with a gasket 21 and is connected to the connecting bracket 3 via bolts 22. Specifically, a connecting lug 23 is provided on the side of the connecting bracket 3. The connecting lug 23 and the connecting block 20 are provided with corresponding threaded holes. The bolts 22 engage the threaded holes to achieve a threaded connection between the connecting lug 23 and the connecting block 20. To ensure a secure connection, the bolts 22 are also covered with rubber sleeves 24.

[0045] The horizontally oscillating, multi-angle, low-frequency vibration generator described in this embodiment uses a stepper motor to drive a belt, which, through a connecting frame, drives the vibration sensor under test, which is fixed to a rotating table. By adjusting the rotation of the stepper motor, the vibration sensor under test can be made to perform sinusoidal motion at a low frequency.

[0046] The entire test device is driven horizontally by a stepper motor. The sensor under test is not affected by gravity in the horizontal direction. Therefore, the acceleration can be set to 0g, making it possible to test small-range vibration accelerometers.

[0047] In a specific embodiment, the track length of this device is 1500mm. When the frequency is 0.1Hz, the vibration acceleration is 0.015g. At this point, the acceleration is sufficient to meet the acceleration capture accuracy of the vibration sensor. If the amplitude is too low, when the frequency is still lower than 0.1Hz, the vibration acceleration will be too low to reach the lower limit of the vibration sensor's measurement sensitivity. The relationship between acceleration, amplitude, and frequency is as follows:

[0048] a=(2πf) 2 Aa=(2πf) 2 A

[0049] Where: a represents acceleration (m / s 2 ); f represents frequency (Hz); A represents amplitude (m)

[0050] This device uses a stepper motor to rotate to achieve sinusoidal vibration.

[0051] In order to accurately simulate the sinusoidal vibration mode using a stepper motor, the following formula is used to calculate and control the working conditions of the stepper motor:

[0052]

[0053] Where R represents the diameter of the driving wheel connected to the stepper motor; P n Indicates the number of steps per circle; S n represents the length of each step. Then:

[0054]

[0055] Among them, T i represents the time of the i-th step.

[0056] The working curve of the stepper motor is as follows Figure 4 shown.

[0057] At t1, the duty cycle of the stepper motor is the lowest and the speed is the slowest. n At this moment, the duty cycle of the stepper motor is the highest and the speed is the fastest. nWhen / A=1, the stepper motor starts to reverse. The duty cycle of the motor is opposite to the previous one. When it reaches t n At time t0, the stepper motor has the highest duty cycle and the fastest speed. When it reaches time t0, the stepper motor starts to reverse. Repeat the previous process. Figure 5 As shown in the figure. In the initial cycle, the motor duty cycle is low, the motor working time is short, and the stopping time is long. In the next cycle, the motor working time increases and the stopping time decreases, thereby increasing the movement speed. When t n During the cycle, the motor working time reaches the maximum and the stopping time reaches the minimum. From this moment on, the motor working time gradually decreases and the stopping time gradually increases. When it reaches A, that is, iS n When / A=1, the motor starts to reverse and the test bench starts to move in the opposite direction. The motor's movement process is symmetrical to the previous movement process. When it reaches the t0 cycle, the motor reverses again and repeats the above process.

[0058] The stepper motor in this device is connected to an 86mm flange. When testing low-frequency vibration at 0.1Hz, the stepper motor's rotation speed is 1.7 rpm and the torque is 0.03Nm. The calculation process is as follows:

[0059] m=5kg,a max =0.2m / s 2 , r = 0.03m, f = 0.1Hz,

[0060]

[0061] F a =ma max =5×0.2=1.0 (Newton)

[0062] Ignoring friction, the motor drive torque is F a r = 1.0 × 0.03 = 0.03 (Nm)

[0063]

[0064] When testing high-frequency vibration at 1Hz, not only is the motor's rotation speed 17 rpm, but the torque is also 3.02Nm. The calculation process is as follows:

[0065] Calculation of f = 1Hz with a travel of 0.51 meters

[0066] a max =(2πf) 2 A d =20.1m / s 2

[0067] F a =ma max =5×20.1=100.5 (N)

[0068] Ignoring friction, the motor drive torque is F a r = 100.5 × 0.03 = 3.015 (Nm)

[0069]

[0070] Table 1 below is a parameter table of a certain brand of stepper motor. This device plans to use a stepper motor model 86BYG250-113. The torque of this stepper motor is 8.5Nm, which can meet the torque requirements of this device.

[0071] Table 1

[0072]

[0073] In summary, the device of the present invention reduces the influence of gravitational acceleration caused by the earth's gravity and achieves the goal of testing small-range acceleration sensors. The axial direction of the gravity acceleration sensor is pointed in the horizontal direction, and the small-range acceleration sensor can be tested by horizontal movement. Acceleration can also be measured under low-frequency vibration conditions. By means of long-stroke horizontal movement, the actual acceleration value is increased under low-frequency sinusoidal vibration conditions, thereby meeting the accuracy requirements of the acceleration sensor. The influence of noise signals on the measurement of extremely small acceleration signals is reduced. By using belt shock absorption and rubber pads and rubber sleeve shock absorption, the transmission of mechanical high-frequency vibration signals is reduced, thereby reducing the influence of noise signals on the measurement results. The rotating table can rotate 360°, and the rotating frame can rotate within a range of 90°. After the vibration sensor to be tested is installed on the rotating disk, the acceleration of the acceleration sensor in any direction can be tested by cooperating with the rotating disk and the rotating frame without the need to repeatedly install the acceleration sensor to be tested.

[0074] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solutions disclosed in the present invention without the need for creative work should be included in the scope of protection of the present invention.

Claims

1. A horizontally oscillating multi-angle low-frequency vibration generating device, characterized in that: include: A base (1); two parallel sliding rods (2) are provided on the base (1); a connecting frame (3) that can slide along the sliding rods (2) is commonly provided on the two sliding rods (2); The connecting frame (3) is provided with a rotating frame (4); a comparison frame (5) is installed on the rotating frame (4); a rotating platform (6) is provided on the comparison frame (5); wherein, one end of the rotating frame (4) is rotatably connected to one side of the connecting frame (3), the other end of the rotating frame (4) is rotatably connected to one end of a support frame (7), the other end of the support frame (7) is rotatably connected to a slider (8), the slider (8) is provided on a screw rod (9), and both ends of the screw rod (9) are rotatably connected to the connecting frame (3); A driving device (10) is provided at one end of the base (1), and the driving device (10) is transmission-connected to the connecting frame (3).

2. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 1, characterized in that: The base (1) comprises two cross beams (11) respectively provided at two ends, two parallel longitudinal beams (12) are connected between the two cross beams (11), and the two sliding rods (2) are respectively provided on the two longitudinal beams (12).

3. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 2, characterized in that: The driving device (10) is connected to a belt (13), and the belt (13) is connected to the connecting frame (3).

4. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 1, characterized in that: A slide rod connector (14) is slidably provided on the slide rod (2), and the connecting frame (3) is connected to the slide rod connector (14).

5. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 1, characterized in that: A blind hole (15) is provided in the middle of the connecting frame (3), and end ears (16) are provided at both ends of the blind hole (15). The two ends of the screw rod (9) are rotatably connected to the two end ears (16).

6. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 5, characterized in that: One end of the screw rod (9) is movably connected to a knob (17) through an end ear (16).

7. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 3, characterized in that: The driving device (10) is connected to one side of a beam (11) through a fixing frame (18); a mounting frame (19) is provided on the other beam (11); and a rotating wheel connected to the belt (13) is provided on the mounting frame (19).

8. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 4, characterized in that: The slide rod connector (14) comprises a connecting block (20) slidably arranged on the slide rod (2), a gasket (21) is provided on the connecting block (20), and the connecting block (20) is connected to the connecting frame (3) by a bolt (22).

9. The horizontally oscillating multi-angle low-frequency vibration generating device according to claim 8, characterized in that: A connecting lug plate (23) is provided on the side of the connecting frame (3), and corresponding threaded holes are provided on the connecting lug plate (23) and the connecting block (20); the threaded connection between the connecting lug plate (23) and the connecting block (20) is achieved by bolts (22) cooperating with the threaded holes.

10. The horizontally oscillating multi-angle low-frequency vibration generating device according to any one of claims 1 to 9, characterized in that: The driving device (10) is a stepping motor.

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