A dynamic signal acquisition device based on rigid guidance technology under high temperature environment

Abstract

This invention discloses a dynamic signal acquisition device based on rigid guidance technology for high-temperature environments. It is a dynamic signal acquisition device suitable for high-temperature environments and relates to the fields of vibration isolation, mechanics, and machinery. The device, through the design and fabrication of high-temperature resistant transmission components, transmits vibration signals from the structure outside the high-temperature thermal field. It uses a room-temperature sensor to acquire the acceleration signals of the structure under high-temperature conditions, solving the problem of acquiring structural vibration signals in high-temperature environments. This invention overcomes the limitations of the operating temperature range of high-temperature accelerometers and the defects of high-temperature interference in laser Doppler vibration measurement methods, providing an important experimental means for studying the vibration characteristics of structures under high-temperature environments.

Description

Technical Field

[0001] This invention relates to the fields of vibration isolation, mechanics, and machinery, specifically to a dynamic signal acquisition device based on rigid guidance technology for high-temperature environments, which is specifically applied to dynamic signal acquisition in high-temperature environment vibration isolation tests. Background Technology

[0002] In high-temperature environments, measuring structural vibration signals typically involves directly mounting dedicated high-temperature resistant accelerometers at measurement points on the structure. This method offers the advantages of ease of installation and direct acquisition of vibration signals from the measurement point. However, dedicated high-temperature resistant accelerometers are very expensive, and their temperature characteristic parameters require correction in high-temperature environments. Furthermore, their measurement accuracy is significantly affected by environmental temperature factors. For rapidly changing dynamic thermal environments like those of engines, where the temperature varies considerably at each moment during rapid heating, dynamic correction of sensor parameters becomes complex and difficult.

[0003] Therefore, researching a dynamic signal acquisition device based on rigid guidance technology in a high-temperature environment, which transmits the vibration signal of the measurement point on the structural surface to the outside of the thermal field through a high-temperature resistant rigid guidance component, and then uses an ordinary room-temperature accelerometer to measure the vibration signal of the structural surface, thereby improving the accuracy of dynamic signal data acquisition in a high-temperature environment and reducing the difficulty and cost of the experiment, has always been a technical problem to be solved by those skilled in the art. Summary of the Invention

[0004] To address the above problems, this invention proposes a dynamic signal acquisition device based on rigid guidance technology for high-temperature environments that is highly accurate and low-cost, thus solving the problems of low accuracy and high cost in existing vibration testing under high-temperature conditions.

[0005] This invention is implemented as follows:

[0006] A dynamic signal acquisition device based on rigid guidance technology for high-temperature environments is characterized in that the dynamic signal acquisition device includes an input signal rigid guidance structure, an output signal rigid guidance structure, and a vibration isolation structure, wherein the vibration isolation structure is located between the input signal rigid guidance structure and the output signal rigid guidance structure; the input signal rigid guidance structure and the middle plate inside the vibration isolation structure are connected by threads; one end of the input rigid guidance rod is connected to an exciter by threads; a pair of metal rubbers are placed inside the vibration isolation structure, with the middle plate placed between these two metal rubbers; the upper cover of the vibration isolation structure is connected to the output signal rigid guidance structure by threads; and the vibration isolation structure is placed inside a high-temperature environment chamber, with two linear bearings ensuring that the entire device is in a horizontal position; input signal and output signal data are acquired by two room-temperature acceleration sensors installed at one end of the input rigid guidance rod and one end of the mass block.

[0007] Specifically, the input signal rigid guiding structure includes an input rigid guiding rod and a middle plate at the end of the input rigid guiding rod; the middle plate is placed inside the vibration isolation structure; the output rigid guiding structure includes an output rigid guiding rod, one end of which is connected to a mass block and a mass block limiting mechanism on the mass block; the mass block is the object to be isolated and is used to collect the output signal; the vibration isolation structure includes a lower end cover and an upper end cover; the upper end cover is connected to the output rigid guiding rod; two pieces of metal rubber are placed between the lower end cover and the upper end cover, the middle plate is located in the lower end cover and the upper end cover, and the two pieces of metal rubber are respectively placed on both sides of the middle plate; the input rigid guiding rod is used to connect to the exciter and transmit the input signal, the output rigid guiding rod is used to connect to the mass block and transmit the dynamic signal after vibration isolation, and the two pieces of metal rubber are installed inside the vibration isolation structure to achieve a bidirectional vibration isolation effect.

[0008] Furthermore, acceleration sensors are installed on both the input rigid guide rod and the mass block; the input and output dynamic signals are collected by two room-temperature acceleration sensors placed at the ends of the input rigid guide rod and the mass block, respectively.

[0009] Furthermore, the mass block limiting mechanism includes bolts, a slide rail, and a slider; the mass block is connected to the slider via bolts, and the slider is connected to the slide rail via a groove to restrict the mass block to move only axially along the rigid guide rod at the output end. The mass block is connected to the slider via bolts, and the slider is connected to the guide rail via a groove to restrict the mass block to move only axially along the rigid guide rod at the output end.

[0010] Furthermore, the input rigid guide rod is threadedly connected to the central plate, and one end of the input rigid guide rod has a threaded hole for connection with the exciter. This threaded hole ensures that the vibration signal input from the exciter is transmitted to the inside of the vibration isolation structure, i.e., the metal-rubber surface, while the output signal is also outside the high-temperature environment, allowing for testing using a room-temperature sensor.

[0011] Furthermore, the output end rigid guide rod is connected to the mass block via threads; the upper end cover and the lower end cover are also connected via threads; this achieves the purpose of exporting the mass of the vibration isolator to the outside of the high-temperature environment, ensuring that the room-temperature sensor can measure the output signal. The vibration isolation structure is also provided with threads to adjust the preload of the lower end cover and the upper end cover on the metal rubber, thereby adjusting the stiffness of the vibration isolation structure.

[0012] Furthermore, after the input signal rigid guiding structure, vibration isolation structure, and output signal rigid guiding structure are interconnected, the input end rigid guiding rod and the output end rigid guiding rod are respectively passed through two linear bearings to ensure that the input end and the output end are on the same horizontal line. The vibration isolation structure is placed in a high-temperature environment chamber, and the lower end cover and the upper end cover of the vibration isolation structure are respectively punched with appropriate holes to ensure that the ambient temperature of the metal rubber inside is consistent with the target temperature controlled by the high-temperature environment chamber.

[0013] The beneficial effects of this invention are as follows: This invention proposes a novel dynamic signal acquisition device based on rigid guidance technology under high temperature environment. Compared with the current devices used in high temperature vibration isolation tests, this device has the following advantages: First, it uses a room temperature accelerometer for data acquisition, which greatly reduces the test cost; second, it avoids the problem that the measurement accuracy of high temperature accelerometer is affected by temperature, thus improving the accuracy of the measurement data. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the dynamic signal acquisition device in this invention;

[0015] Figure 2 This is a schematic diagram of the internal metal-rubber installation in the vibration isolation structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the installation of the room temperature accelerometer at the input end in this invention;

[0017] Figure 4 This is a schematic diagram of the installation of the room temperature accelerometer at the output end in this invention;

[0018] Figure 5 This is a schematic diagram of the installation of the dynamic signal acquisition device in the high-temperature environment chamber of the present invention;

[0019] Figure 6 This is a schematic diagram of the installation of the dynamic signal acquisition device, exciter, and high-temperature environment chamber in this invention;

[0020] Figure 7 This is a graph showing the results of a sinusoidal linear sweep frequency test at 300℃ using the present invention.

[0021] Figure 8 This is a graph showing the results of a random experiment at 300°C measured using the present invention.

[0022] Among them, 1-input rigid guide rod, 2-linear bearing, 3-lower end cover, 4-upper end cover, 5-mass block, 6-bolt, 7-accelerometer, 8-slide rail, 9-slider, 10-output rigid guide rod, 11-metal rubber, 12-middle plate. Implementation

[0023] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following examples provide a more detailed description of the invention. It should be noted that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0024] like Figures 1-2 As shown, a dynamic signal acquisition device based on rigid guidance technology under high-temperature conditions according to the present invention includes an input signal rigid guidance structure, an output signal rigid guidance structure, and a vibration isolation structure. The input signal rigid guidance structure includes an input rigid guide rod 1 and a middle plate 12; the output rigid guidance structure includes an output rigid guide rod 10, a mass block 5, and a mass block limiting mechanism, the mass block limiting mechanism including a bolt 6, a slide rail 8, and a slider 9; the vibration isolation structure includes a lower end cover 3, an upper end cover 4, and an internal metal rubber 11. The input rigid guide rod is connected to the middle plate via threads and passes through the lower end cover and a linear bearing, placing the middle plate inside the vibration isolation structure. A threaded hole is pre-drilled at its other end for connection to an exciter.

[0025] One end of the output rigid guide rod 10 is threaded to the upper end cover, and the other end is threaded to the mass block 5, passing through a linear bearing. The mass block is fixed to the slider with four bolts, and the slider is mounted on the slide rail through grooves to limit the displacement of the mass block. A pair of metal rubbers 11 are placed on both sides of the middle plate 12. The lower end cover and the upper end cover are threaded together, enclosing the middle plate 12 and the metal rubbers. This allows the input signal to be transmitted to the middle plate through the input rigid guide rod, and then to the surface of the metal rubbers. The output signal can be transmitted to the output rigid guide rod through the upper end cover, and then to the mass block. The preload of the metal rubbers can also be adjusted through the threads between the upper and lower end covers. The two linear bearings ensure that the entire test device is on the same horizontal line.

[0026] like Figures 3-4 As shown, the input-end room temperature acceleration sensor 7 is installed at one end of the input rigid guide rod to measure the input signal of the exciter, and the output-end room temperature acceleration sensor is installed at one end of the mass block to measure the output signal after vibration isolation.

[0027] like Figure 5 As shown, the guide rod on the vibrator is connected to the input rigid guide rod 1 by a thread, which is connected to the assembled high-temperature environment dynamic signal acquisition device. The dynamic signal acquisition device is passed through the inside of the high-temperature environment chamber and the whole device is in a horizontal state to ensure that the input signal of the vibrator and the output signal on the mass block are both in the axial direction of the device, so as to reduce data error.

[0028] like Figure 6 As shown, after the dynamic signal acquisition device is installed, the exciter, room temperature acceleration sensor and computer software are connected to carry out the corresponding vibration test.

[0029] like Figures 7-8 The figures show the experimental results obtained under sinusoidal linear frequency sweep excitation and random excitation at an ambient temperature of 300℃. It can be seen that the signal acquisition device has a good acquisition effect on both input and output signals.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A dynamic signal acquisition device for vibration testing based on rigid guidance technology under high-temperature conditions, characterized in that, The dynamic signal acquisition device includes an input signal rigid guiding structure, an output signal rigid guiding structure, and a vibration isolation structure, wherein the vibration isolation structure is located between the input signal rigid guiding structure and the output signal rigid guiding structure. The input signal rigid guiding structure includes an input rigid guiding rod (1) and a middle plate (12) at the end of the input rigid guiding rod (1); the middle plate (12) is placed inside the vibration isolation structure; The output signal rigid guiding structure includes an output rigid guiding rod (10), one end of which is connected to a mass block (5) and a mass block limiting mechanism on the mass block (5); the mass block is a vibration isolator used to collect the output signal. The vibration isolation structure includes a lower end cover (3) and an upper end cover (4); the upper end cover (4) is connected to the output rigid guide rod (10); Two pieces of metal rubber (11) are provided between the lower end cover (3) and the upper end cover (4). The middle plate (12) is located in the lower end cover (3) and the upper end cover (4). The two pieces of metal rubber (11) are respectively placed on both sides of the middle plate (12). The input rigid guide rod (1) is used to connect the exciter and transmit the input signal, and the output rigid guide rod (10) is used to connect the mass block (5) and transmit the dynamic signal after vibration isolation. Two metal rubber (11) are installed inside the vibration isolation structure to achieve the effect of bidirectional vibration isolation. Acceleration sensors (7) are provided on both the input rigid guide rod (1) and the mass block (5); the dynamic signals of the input and output are collected by two room temperature acceleration sensors (7) placed at the ends of the input rigid guide rod (1) and the mass block (5), respectively. After the input signal rigid guiding structure, vibration isolation structure and output signal rigid guiding structure are connected to each other, the input rigid guiding rod (1) and the output rigid guiding rod (10) are respectively passed through two linear bearings (2) so that the input end and the output end are on the same horizontal line. The vibration isolation structure is placed in a high temperature environment chamber. The lower end cover (3) and the upper end cover (4) of the vibration isolation structure are respectively punched with appropriate holes so that the ambient temperature of the metal rubber inside is consistent with the target temperature controlled by the high temperature environment chamber.

2. The dynamic signal acquisition device for vibration testing based on rigid guidance technology under high temperature environment according to claim 1, characterized in that, The mass block limiting mechanism includes a bolt 6, a slide rail 8, and a slider 9; the mass block (5) is connected to the slider (9) by the bolt (6), and the slider (9) is connected to the slide rail (8) by the groove to limit the mass block (5) to move only in the axial direction of the output rigid guide rod (10).

3. The dynamic signal acquisition device for vibration testing based on rigid guidance technology under high temperature environment according to claim 1, characterized in that, The input rigid guide rod (1) is connected to the middle plate (12) by a thread. One end of the input rigid guide rod (1) has a threaded hole for connecting to the exciter.

4. The dynamic signal acquisition device for vibration testing based on rigid guidance technology under high temperature environment according to claim 1, characterized in that, The output rigid guide rod (10) and the mass block (5) are connected by threads; the upper end cover (4) and the lower end cover (3) are connected by threads; the vibration isolation structure is also provided with threads to adjust the pre-tightening force of the lower end cover (3) and the upper end cover (4) on the metal rubber (11) so as to adjust the stiffness of the vibration isolation structure.

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