Apparatus and method for providing broadband micro-vibrations to an assembly interface

Abstract

The application relates to the technical field of dynamic characteristic measurement of mechanical contact interfaces, in particular to a device and a method for providing wide-frequency micro-vibration for an assembled contact interface. The device comprises a rectangular frame main body composed of a left upper part external frame and a right lower part external frame, the left upper part external frame and the right lower part external frame are oppositely provided with clamping parts, the left upper part external frame is horizontally provided with a first pre-tightening bolt, the right lower part external frame is vertically provided with a piezoelectric ceramic actuator, and the left upper part external frame is oppositely provided with a second pre-tightening bolt. In addition, the device further comprises a tension and compression force sensor, a micro force sensor, a piezoelectric amplifier, a function signal generator, a transmitter and an upper computer. The scheme provided by the application provides a basis for exploring the micro-plasticity and micro-slippage mechanism of the precise fitting contact interface, and further helps to reveal the change rule of the contact state of the precise fitting interface from the statistical point of view.

Description

Technical Field

[0001] This invention relates to the field of dynamic characteristic measurement technology of mechanical contact interfaces, and in particular to a device and method for providing broadband micro-vibration for assembly contact interfaces. Background Technology

[0002] In the field of assembly, the most common mechanical connection methods are threaded connections and interference fits. Under the existing connection methods, the main factor leading to the instability of the assembly performance of high-precision instruments is the lack of understanding of the micro-time-varying mechanism of the contact interface under the service condition of broadband micro-vibration. Specifically, when high-precision instruments are subjected to continuous broadband micro-vibration loads, the contact state of the contact interface generated by different components during assembly changes due to micro-plasticity and micro-slippage, which in turn affects the stability of the contact interface and ultimately leads to the instability of the overall performance of the high-precision instrument.

[0003] Currently, there is a lack of systematic research and corresponding experimental equipment on the effects of different roughness and metal mating surfaces on microplasticity and microslippage at the contact interface under different preload pressures and different broadband micro-vibration conditions. At the same time, there is a lack of statistical analysis on the influence of surface roughness, preload, and the broadband range and vibration characteristics of micro-vibration on the change behavior of the contact interface connection state, as well as a lack of summarizing the formation rules of microplasticity and microslippage in the above phenomena. Summary of the Invention

[0004] To address the aforementioned problems, embodiments of the present invention provide an apparatus and method for providing broadband micro-vibration for assembly contact interfaces.

[0005] In one aspect, this invention provides a device for providing broadband micro-vibration for assembly contact interfaces, comprising a rectangular frame body composed of an upper left outer frame and a lower right outer frame. Clamping portions are disposed opposite to each other on the upper left and lower right outer frames, forming a clamping channel between the two clamping portions adapted to the sample to be tested. A first pre-tightening bolt is horizontally disposed on the upper left outer frame relative to the clamping channel. A piezoelectric ceramic actuator is vertically disposed on the lower right outer frame, located on one side of the clamping portion. A second pre-tightening bolt is vertically disposed on the upper left outer frame relative to the piezoelectric ceramic actuator. Furthermore, it also includes:

[0006] The system includes a tension / compression sensor, a miniature force sensor, a piezoelectric amplifier, a function signal generator, a transmitter, and a host computer. The tension / compression sensor and the miniature force sensor are connected to the transmitter, and the transmitter is connected to the host computer. The piezoelectric ceramic actuator is connected to the piezoelectric amplifier, the piezoelectric amplifier is connected to the function signal generator, and the function signal generator is connected to the host computer.

[0007] Another aspect of the present invention provides a method for providing tangential broadband micro-vibration to an assembly contact interface using the above-described device, comprising:

[0008] The vibrating sample is fixed to the moving end of the piezoelectric ceramic actuator. The right side of the vibrating sample is attached to the lower right part of the outer frame, and a tension and compression sensor is fixed to the top surface of the vibrating sample.

[0009] The miniature force sensor is fixed on the left side of the fixed sample, which is placed on the clamping part of the lower right outer frame and is in contact with the left side of the vibrating sample.

[0010] Combine and fix the upper left and lower right external frames to form a rectangular frame body so that the fixed sample is fixed in the vertical direction. Then fix the rectangular frame body on the optical vibration isolation platform.

[0011] Screw in the second pre-tightening bolt to fix the tension / compression sensor in the vertical direction and record the initial value of the tension / compression sensor at this time; screw in the first pre-tightening bolt to abut against the miniature force sensor until the pre-tightening pressure detected by the miniature force sensor reaches the set value;

[0012] The output voltage of the piezoelectric amplifier is adjusted based on the detection value of the tension and compression sensors so that the thrust provided by the moving end of the piezoelectric ceramic actuator reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage.

[0013] The output parameters of the function generator are set by the host computer, so that the output voltage of the piezoelectric amplifier fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer records the force value of the vibrating sample through the tension and compression sensors.

[0014] Another aspect of the present invention provides a method for providing normal broadband micro-vibration to an assembly contact interface using the above-described device, comprising:

[0015] The vibrating sample is fixed to the moving end of the piezoelectric ceramic actuator, with a gap between the right side of the vibrating sample and the lower right part of the outer frame.

[0016] The tension and compression sensor is fixed on the top surface of the fixed sample, and a thin plate is fixed on the top of the tension and compression sensor. Then the fixed sample is placed on the top surface of the vibration sample, and the right side of the fixed sample is attached to the lower right part of the outer frame. The second pre-tightening bolt is screwed in to abut against the thin plate.

[0017] Combine and fix the upper left and lower right external frames to form a rectangular frame body. Screw in the first pre-tightening bolt and screw in two anti-loosening nuts on the first pre-tightening bolt. With the cooperation of the first pre-tightening bolt and the anti-loosening nuts, fix the sample in the horizontal direction. After fixing, fix the rectangular frame body on the optical vibration isolation platform.

[0018] Adjust the torque of the second preload bolt so that the preload pressure provided by the second preload bolt to the thin plate, as detected by the tension and compression sensor, reaches the set value;

[0019] Subsequently, the output voltage of the piezoelectric amplifier is adjusted based on the detection value of the tension and compression sensors, so that the thrust provided by the moving end of the piezoelectric ceramic actuator reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage.

[0020] The output parameters of the function generator are set by the host computer, so that the output voltage of the piezoelectric amplifier fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer records the force value of the vibrating sample through the tension and compression sensors.

[0021] Compared with existing technologies, the advantages of this invention are as follows: It fully utilizes the piezoelectric ceramic actuator, which, with changes in input voltage, can generate micrometer-level displacement changes and a wide frequency range not found in general large vibrators. This allows for a more accurate simulation of the micro-vibration conditions of a precision-fit interface at the contact interface between the vibrating sample and the stationary sample. Furthermore, since the displacement change of the piezoelectric ceramic actuator is input via a programmable voltage signal, it can fully and precisely simulate the micro-vibration characteristics of high-precision instruments under specific operating conditions. This means it can define not only basic vibration signal parameters such as frequency, amplitude, and waveform, but also more precisely set various scenarios including regular sinusoidal signals, linear sweep signals in a specific frequency band, and random signals in complex, noisy environments. Additionally, the entire device has a simple structure; slightly changing the sample fixing method allows switching between simulating interface normal and tangential vibration conditions, thus greatly reducing the complexity of the test.

[0022] Furthermore, this device can simulate the time-varying contact state of precision instrument components with different mating surface conditions under different assembly preloads and micro-vibration conditions by changing the material properties and surface roughness of the contact interface between the vibrating and stationary samples. With the aid of this device, research can be conducted on the influence of material properties, surface roughness, preload, and the wide frequency range and parameter characteristics of micro-vibration on the connection state of precision mating interfaces during service. Simultaneously, the experimental data provided by this device offers a basis for exploring the microplasticity and micro-slip mechanisms of precision mating contact interfaces, and further helps to reveal the changing patterns of the contact state of precision mating interfaces from a statistical perspective. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the first state structure of a device for providing broadband micro-vibration for assembly contact interfaces, provided by an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the second state structure of a device for providing broadband micro-vibration for assembly contact interfaces, provided by an embodiment of the present invention.

[0026] Figure 3 A schematic diagram illustrating a method for providing tangential vibration to an assembly contact interface, as provided in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram illustrating a method for providing normal vibration to an assembly contact interface, as provided in an embodiment of the present invention.

[0028] The components include: upper left outer frame 1, lower right outer frame 2, clamping part 3, first pre-tightening bolt 4, piezoelectric ceramic actuator 5, second pre-tightening bolt 6, tension / compression sensor 7, miniature force sensor 8, piezoelectric amplifier 9, function signal generator 10, transmitter 11, host computer 12, fixed sample 13, vibration sample 14, thin plate 15, and anti-loosening nut 16. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0030] See Figures 1-4This invention provides a device for providing wideband micro-vibration for assembly contact interfaces, comprising a rectangular frame body composed of an upper left outer frame 1 and a lower right outer frame 2. Clamping portions 3 are disposed opposite to each other on the upper left outer frame 1 and the lower right outer frame 2, forming a clamping channel between the two clamping portions 3 adapted to the sample to be tested. A first pre-tightening bolt 4 is horizontally disposed on the upper left outer frame 1 relative to the clamping channel. A piezoelectric ceramic actuator 5 is vertically disposed on the lower right outer frame 2, located on one side of the clamping portion 3. A second pre-tightening bolt 6 is vertically disposed on the upper left outer frame 1 relative to the piezoelectric ceramic actuator 5. Furthermore, it also includes:

[0031] The system includes a tension / compression sensor 7, a miniature force sensor 8, a piezoelectric amplifier 9, a function signal generator 10, a transmitter 11, and a host computer 12. The tension / compression sensor 7 and the miniature force sensor 8 are both connected to the transmitter 11, and the transmitter is connected to the host computer 12. The piezoelectric ceramic actuator 5 is connected to the piezoelectric amplifier 9, the piezoelectric amplifier 9 is connected to the function signal generator 10, and the function signal generator 10 is connected to the host computer 12.

[0032] In practice, the test specimens include a fixed specimen 13 and a vibration specimen 14. The two external frames are fixed into a rectangular frame body by M8 bolts at the lower left position and M6 bolts at the upper right position. During the test, the rectangular frame body is fixed on the optical vibration isolation platform. The first preload bolt 4 and the second preload bolt 6 are both M8 bolts. When providing tangential vibration, the fixed specimen 13 is fixed in the clamping channel to limit and fix the fixed specimen 13 in the vertical direction. When providing normal vibration, the first preload bolt 4 can limit and fix the fixed specimen 13 in the horizontal direction.

[0033] The piezoelectric ceramic actuator 5 is fixed to the lower right outer frame 2 by an M4 double-ended threaded screw. The adapter of the moving end of the piezoelectric ceramic actuator 5 is an M4 external thread type, which is connected and fixed to the internal threaded hole at the bottom of the vibration sample 14. By setting different working voltages of the piezoelectric ceramic actuator 5, different movement conditions with micron-level displacement of its moving end can be achieved, so as to provide push and pull force to the vibration sample 14 and achieve the vibration condition simulation effect of the vibration sample 14.

[0034] In specific implementation, the process of providing tangential vibration to the assembly contact interface through the above-mentioned device includes:

[0035] The vibration sample 14 is fixed to the moving end of the piezoelectric ceramic actuator 5. The right side of the vibration sample 14 is attached to the lower right part of the outer frame 2. The tension and compression sensor 7 is fixed on the top surface of the vibration sample 14. The vibration sample 14 and the tension and compression sensor 7 can be connected by an M8 double-ended threaded screw.

[0036] The miniature force sensor 8 is fixed on the left side of the fixed sample 13, which is placed on the clamping part 3 of the lower right outer frame 2 and is attached to the left side of the vibration sample 14. The miniature force sensor 8 can be fixedly connected to the fixed sample 13 by three M3 double-ended threaded screws.

[0037] Combine and fix the upper left outer frame 1 and the lower right outer frame 2 to form a rectangular frame body so that the fixed sample 13 is fixed in the vertical direction. Then fix the rectangular frame body on the optical vibration isolation platform. Four M6 screws can be used to fix the rectangular frame body on the optical vibration isolation platform.

[0038] Screw in the second pre-tightening bolt 6 to fix the tension / compression sensor 7 in the vertical direction, and record the initial value of the tension / compression sensor 7 at this time; use a torque wrench to screw in the first pre-tightening bolt 4 to abut against the miniature force sensor 8, and adjust the torque of the first pre-tightening bolt 4 until the pre-tightening pressure detected by the miniature force sensor 8 reaches the set value.

[0039] The output voltage of the piezoelectric amplifier 9 is adjusted based on the detection value of the tension and compression sensor 7, so that the thrust provided by the moving end of the piezoelectric ceramic actuator 5 reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage.

[0040] The host computer 12 sets the output parameters of the function generator 10, including frequency, amplitude, waveform, etc., so that the output voltage of the piezoelectric amplifier 9 fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer 12 records the force value of the vibrating sample 14 through the tension and pressure sensor 7. The force value is the difference between the value monitored in real time by the tension and pressure sensor 7 during the tossing and the initial value.

[0041] In specific implementation, the process of providing normal vibration to the assembly contact interface through the above-mentioned device includes:

[0042] The vibrating sample 14 is fixed to the moving end of the piezoelectric ceramic actuator 5, and a gap is left between the right side of the vibrating sample 14 and the lower right part of the outer frame 2.

[0043] The tension and compression sensor 7 is fixed on the top surface of the fixed sample 13, and a thin plate 15 is fixed on the top of the tension and compression sensor 7 by an M8 double-ended threaded screw. Then, the fixed sample 13 is placed on the top surface of the vibration sample 14, and the right side of the fixed sample 13 is attached to the lower right part of the outer frame 2. The second pre-tightening bolt 6 is screwed in and abuts against the thin plate 15.

[0044] Combine and fix the upper left outer frame 1 and the lower right outer frame 2 to form a rectangular frame body. Screw in the first pre-tightening bolt 4 and screw in two anti-loosening nuts 16 on the first pre-tightening bolt 4. With the cooperation of the first pre-tightening bolt 4 and the anti-loosening nuts 16, fix the fixed sample 13 in the horizontal direction. After fixing, fix the rectangular frame body on the optical vibration isolation platform.

[0045] The torque of the second preload bolt 6 can be adjusted by a torque wrench so that the preload pressure provided by the second preload bolt 6 to the thin plate 15 by the tension and pressure sensor 7 reaches the set value.

[0046] Subsequently, the output voltage of the piezoelectric amplifier 9 is adjusted based on the detection value of the tension and compression sensor 7, so that the thrust provided by the moving end of the piezoelectric ceramic actuator 5 reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage.

[0047] The host computer 12 sets the output parameters of the function generator 10, so that the output voltage of the piezoelectric amplifier 9 fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer 12 records the force value of the vibrating sample 14 through the tension and pressure sensor 7. The force value is the difference between the value monitored in real time by the tension and pressure sensor 7 during the fluctuation and the pre-tightening pressure setting value.

[0048] Compared with existing technologies, the advantages of this invention are as follows: It fully utilizes the piezoelectric ceramic actuator, which, with changes in input voltage, can generate micrometer-level displacement changes and a wide frequency range not found in general large vibrators. This allows for a more accurate simulation of the micro-vibration conditions of a precision-fit interface at the contact interface between the vibrating sample and the stationary sample. Furthermore, since the displacement change of the piezoelectric ceramic actuator is input via a programmable voltage signal, it can fully and precisely simulate the micro-vibration characteristics of high-precision instruments under specific operating conditions. This means it can define not only basic vibration signal parameters such as frequency, amplitude, and waveform, but also more precisely set various scenarios including regular sinusoidal signals, linear sweep signals in a specific frequency band, and random signals in complex, noisy environments. Additionally, the entire device has a simple structure; slightly changing the sample fixing method allows switching between simulating interface normal and tangential vibration conditions, thus greatly reducing the complexity of the test.

[0049] Furthermore, this device can simulate the time-varying contact state of precision instrument components with different mating surface conditions under different assembly preloads and micro-vibration conditions by changing the material properties and surface roughness of the contact interface between the vibrating and stationary samples. With the aid of this device, research can be conducted on the influence of material properties, surface roughness, preload, and the wide frequency range and parameter characteristics of micro-vibration on the connection state of precision mating interfaces during service. Simultaneously, the experimental data provided by this device offers a basis for exploring the microplasticity and micro-slip mechanisms of precision mating contact surfaces, and further helps to reveal the changing patterns of the contact state of precision mating interfaces from a statistical perspective.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A device for providing broadband micro-vibration for assembly contact interfaces, characterized in that, The system includes a rectangular frame body composed of an upper left outer frame and a lower right outer frame. Clamping portions are positioned opposite each other on the upper left and lower right outer frames, forming a clamping channel between them that adapts to the sample to be tested. A first pre-tightening bolt is horizontally positioned on the upper left outer frame relative to the clamping channel. A piezoelectric ceramic actuator is vertically positioned on the lower right outer frame, located on one side of the clamping portion. A second pre-tightening bolt is vertically positioned on the upper left outer frame relative to the piezoelectric ceramic actuator. The system also includes: The system includes a tension / compression sensor, a miniature force sensor, a piezoelectric amplifier, a function signal generator, a transmitter, and a host computer. The tension / compression sensor and the miniature force sensor are connected to the transmitter, and the transmitter is connected to the host computer. The piezoelectric ceramic actuator is connected to the piezoelectric amplifier, the piezoelectric amplifier is connected to the function signal generator, and the function signal generator is connected to the host computer.

2. A method for providing tangential broadband micro-vibration to an assembly contact interface using the device described in claim 1, characterized in that, include: The vibrating sample is fixed to the moving end of the piezoelectric ceramic actuator. The right side of the vibrating sample is attached to the lower right part of the outer frame, and a tension and compression sensor is fixed to the top surface of the vibrating sample. The miniature force sensor is fixed on the left side of the fixed sample, which is placed on the clamping part of the lower right outer frame and is in contact with the left side of the vibrating sample. Combine and fix the upper left and lower right external frames to form a rectangular frame body so that the fixed sample is fixed in the vertical direction. Then fix the rectangular frame body on the optical vibration isolation platform. Screw in the second pre-tightening bolt to fix the tension / compression sensor in the vertical direction and record the initial value of the tension / compression sensor at this time; screw in the first pre-tightening bolt to abut against the miniature force sensor until the pre-tightening pressure detected by the miniature force sensor reaches the set value; The output voltage of the piezoelectric amplifier is adjusted based on the detection value of the tension and compression sensors so that the thrust provided by the moving end of the piezoelectric ceramic actuator reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage. The output parameters of the function generator are set by the host computer, so that the output voltage of the piezoelectric amplifier fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer records the force value of the vibrating sample through the tension and compression sensors.

3. A method for providing normal broadband micro-vibration to an assembly contact interface using the device described in claim 1, characterized in that, include: The vibrating sample is fixed to the moving end of the piezoelectric ceramic actuator, with a gap between the right side of the vibrating sample and the lower right part of the outer frame. The tension and compression sensor is fixed on the top surface of the fixed sample, and a thin plate is fixed on the top of the tension and compression sensor. Then the fixed sample is placed on the top surface of the vibration sample, and the right side of the fixed sample is attached to the lower right part of the outer frame. The second pre-tightening bolt is screwed in to abut against the thin plate. Combine and fix the upper left and lower right external frames to form a rectangular frame body. Screw in the first pre-tightening bolt and screw in two anti-loosening nuts on the first pre-tightening bolt. With the cooperation of the first pre-tightening bolt and the anti-loosening nuts, fix the sample in the horizontal direction. After fixing, fix the rectangular frame body on the optical vibration isolation platform. Adjust the torque of the second preload bolt so that the preload pressure provided by the second preload bolt to the thin plate, as detected by the tension and compression sensor, reaches the set value; Subsequently, the output voltage of the piezoelectric amplifier is adjusted based on the detection value of the tension and compression sensors, so that the thrust provided by the moving end of the piezoelectric ceramic actuator reaches the set threshold, and the output voltage at this time is recorded. The fluctuation threshold of the output voltage is determined based on the recorded output voltage. The output parameters of the function generator are set by the host computer, so that the output voltage of the piezoelectric amplifier fluctuates within the fluctuation threshold according to the output parameter settings. During the fluctuation, the host computer records the force value of the vibrating sample through the tension and compression sensors.

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