Method and system for measuring ultrasonic proportionality coefficient of thickness of lubricating film of sliding bearing

Abstract

The invention discloses a method and system for measuring the ultrasonic proportionality coefficient of the thickness of a lubricating film of a sliding bearing, and the method comprises the steps: firstly, obtaining the comprehensive response coefficient of sound waves in a transition combination layer of a substrate and a lining through calculating the proportionality coefficient of a reflection echo signal of a bearing bush in an air medium and a reflection echo signal of a substrate-lining interface; characterizing the propagation rule of sound waves in a base body and lining combination layer; secondly, a proportionality coefficient is constructed based on a lubricating film reflection echo signal and a matrix-lining interface reflection echo signal, a lubricating film reflection coefficient is calculated in combination with a comprehensive response coefficient of sound waves in a matrix-lining transition combination layer, and finally the thickness of the lubricating film is solved through a resonance model method or a composite model method. According to the invention, the influence of the change of the binding force between the sensor and the substrate and the unstable voltage of ultrasonic pulse emission equipment on the reference signal can be avoided, the robustness is high, and the long-term reliable monitoring of the thickness of the lubricating film of the sliding bearing is facilitated.

Description

Background Art

[0002] A sliding bearing is a key supporting component in large rotating machinery such as hydro-generating units and thermal power generating units. It forms a lubricating film between the bearing bush and the mirror plate and uses the hydrodynamic effect to bear the load of the rotating component. In the actual industrial operation environment, the thickness of the lubricating film is affected by various factors such as load changes, speed fluctuations, and temperature changes, which in turn have a significant impact on the performance of the bearing, such as friction, wear, and heat generation. Good lubrication conditions can ensure the stable operation of the bearing, effectively reduce friction, avoid failures caused by overheating, and thus significantly extend the service life of the bearing and the equipment. Therefore, accurately and reliably monitoring the lubricating film thickness is of crucial significance for the optimal design of bearing performance and the prevention of early lubrication failure of equipment.

[0003] For the measurement of the lubricating film thickness, the ultrasonic method stands out due to its unique non-invasive advantage. The ultrasonic method can penetrate metal materials to achieve non-destructive detection of the lubricating film thickness of the bearing, and there is no need to change the material or structural properties of the part itself. In addition, the ultrasonic method has a wide measurement range, and the minimum lubricating film thickness measurement can reach the sub-micron level. Under ideal conditions, the ultrasonic method has high measurement accuracy, which can provide a reliable guarantee for the accurate monitoring of the lubricating film thickness. Therefore, the ultrasonic method is regarded as an efficient, reliable, and promising industrial field lubricating film thickness measurement method. Currently, it has been widely used in product-level bench tests such as large thrust sliding bearings, large wind power rolling bearings, aviation fuel pumps, and engine piston ring systems, and has achieved good results.

[0004] In the ultrasonic measurement method, the lubricating film thickness is usually calculated by measuring the lubricating film reflection coefficient (i.e., the ratio of the lubricating film reflection signal to the incident signal). However, since the incident signal cannot be directly collected, it is usually necessary to disassemble the equipment, expose the friction pair surface to the air, and approximate the incident signal by measuring the reflected echo of the air interface as a reference signal. However, when long-term monitoring of the equipment is carried out, the ultrasonic sensor is embedded in the bearing bush for a long time and is easily interfered by factors such as temperature, vibration, and pollution, which leads to changes in the bonding force between the sensor and the substrate, and then leads to changes in the ultrasonic reflected echo, resulting in measurement errors in the lubricating film thickness. Therefore, how to deal with the problem of changes in the reference signal caused by changes in the bonding force between the sensor and the substrate and improve the robustness of ultrasonic lubricating film thickness measurement is the current research difficulty. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an ultrasonic proportional coefficient measurement method and system for the lubricating film thickness of a sliding bearing in view of the deficiencies in the above-mentioned prior art, so as to solve the technical problems that the reference signal needs to be updated frequently in engineering practice and the existing sliding bearing lubricating film thickness measurement method has poor robustness, and to achieve accurate measurement of the lubricating film thickness of the sliding bearing.

[0006] The present invention adopts the following technical solutions:

[0007] A method for measuring the ultrasonic proportional coefficient of the lubricating film thickness of a sliding bearing, comprising the following steps:

[0008] Calculate the proportional coefficient of the echo signal reflected from the bearing bush in the air medium and the echo signal reflected from the matrix-bushing interface, and obtain the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the bushing;

[0009] Construct a proportional coefficient based on the lubricating film echo signal and the matrix-bushing interface echo signal;

[0010] Separate the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportional coefficient and comprehensive response coefficient;

[0011] Calculate the lubricating film thickness based on the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

[0012] Preferably, the comprehensive response coefficient is specifically:

[0013] Collect the echo signal of the sliding bearing in the air state, and use the obtained echo signal B ca1 (f) of the bushing-air interface and the echo signal B sc1 (f) of the matrix-bushing interface to construct a proportional coefficient K1(f), and obtain the amplitude |K1(f)| and phase Φ K1 (f) of the proportional coefficient K1(f), and further obtain the amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f).

[0014] Preferably, the amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f) are specifically:

[0015]

[0016] Among them, |W sc | is the amplitude of the transmission coefficient of the matrix-bushing interface; |W cs | is the amplitude of the transmission coefficient of the bushing-matrix interface; α c is the attenuation coefficient of the ultrasonic wave propagating in the bushing; K1(f) is the proportional coefficient; d c is the thickness of the bushing; |V sc | is the amplitude of the reflection coefficient of the matrix-bushing interface; t c is the propagation time of the ultrasonic wave in the bushing; is the phase of the transmission coefficient of the matrix-bushing interface; is the phase of the transmission coefficient at the liner-substrate interface; is the phase of the reflection coefficient at the substrate-liner interface.

[0017] Preferably, a proportionality coefficient is constructed based on the lubricating film reflected echo signal and the substrate-liner interface reflected echo signal, specifically:

[0018] Using the lubricating film reflected echo signal B co2 (f) collected by actual testing and the reflected echo signal B sc2 (f) of the substrate-liner interface to construct the proportionality coefficient K2(f), and obtaining the proportionality coefficient amplitude spectrum |K2(f)| and the proportionality coefficient phase spectrum Φ K2 (f).

[0019] Preferably, the proportionality coefficient amplitude spectrum |K2(f)| and the proportionality coefficient phase spectrum Φ K2 (f) are specifically:

[0020]

[0021] where, |R(f)| is the amplitude of the lubricating film reflection coefficient; Φ R (f) is the phase of the lubricating film reflection coefficient, |W sc | is the amplitude of the transmission coefficient at the substrate-liner interface, |W cs | is the amplitude of the transmission coefficient at the liner-substrate interface, α c is the attenuation coefficient of the ultrasonic wave propagating in the liner, d c is the thickness of the liner, |V sc | is the amplitude of the reflection coefficient at the substrate-liner interface, f is the frequency, t c is the propagation time of the ultrasonic wave in the liner, is the phase of the transmission coefficient at the substrate-liner interface; is the phase of the transmission coefficient at the liner-substrate interface; is the phase of the reflection coefficient at the substrate-liner interface.

[0022] Preferably, the lubricating film reflection coefficient amplitude spectrum |R(f)| and the lubricating film reflection coefficient phase spectrum Φ R (f) are specifically:

[0023]

[0024] Φ R (f) = Φ K2 (f) - 2πft c - Φ CR (f)

[0025] where, |K2(f)| is the proportionality coefficient amplitude spectrum, Φ K2(f) is the proportional coefficient phase spectrum, |CR(f)| is the amplitude spectrum of the comprehensive response coefficient, and α c is the attenuation coefficient of ultrasonic wave propagation in the liner, and d c is the thickness of the liner, f is the frequency, and t c is the propagation time of ultrasonic wave in the liner, and Φ CR (f) is the comprehensive response coefficient phase spectrum.

[0026] Preferably, according to the characteristics of the lubricating film reflection coefficient, when there is a minimum point phenomenon in the amplitude spectrum |f(f)| of the lubricating film reflection coefficient or the lubricating film reflection coefficient phase spectrum Φ R (f) has a zero-crossing phenomenon, the resonance model method is used to calculate the lubricating film thickness h; when there is no extreme point phenomenon in the amplitude spectrum |R(f)| of the lubricating film reflection coefficient, the composite model method is used to calculate the lubricating film thickness h.

[0027] Preferably, the resonance model method is used to calculate the lubricating film thickness h as follows:

[0028]

[0029] where m is the resonance order; f m is the minimum point frequency or zero-crossing frequency; c o is the propagation speed of ultrasonic wave in the lubricating medium.

[0030] Preferably, the composite model method is used to calculate the lubricating film thickness h as follows:

[0031]

[0032] where V co is the reflection coefficient at the liner-lubricating film interface; V os is the reflection coefficient at the lubricating film-steel interface, and c o is the propagation speed of ultrasonic wave in the lubricating medium, and f is the frequency.

[0033] In a second aspect, an ultrasonic proportional coefficient measurement system for the lubricating film thickness of a sliding bearing provided by an embodiment of the present invention includes:

[0034] a coefficient module that calculates the proportional coefficient of the echo signal reflected by the bearing bush in the air medium and the echo signal reflected by the matrix-liner interface, and obtains the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the liner;

[0035] a construction module that constructs a proportional coefficient based on the lubricating film echo signal and the matrix-liner interface echo signal;

[0036] a separation module that separates the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportional coefficient and comprehensive response coefficient;

[0037] An output module that calculates the lubricating film thickness based on the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

[0038] In a third aspect, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing.

[0039] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium including a computer program. When the computer program is executed by a processor, it implements the steps of the above ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing.

[0040] In a fifth aspect, a chip includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing.

[0041] In a sixth aspect, an embodiment of the present invention provides an electronic device including a computer program. When the computer program is executed by the electronic device, it implements the steps of the above ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] An ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing constructs a proportional coefficient by using the lubricating film reflected echo signal and the substrate-liner interface reflected echo signal collected by a sensor, and calculates the lubricating film reflection coefficient by combining the proportional coefficient and the comprehensive response coefficient of the substrate-liner interface transition layer. It is not affected by the change of the binding force between the sensor and the substrate, solves the problem of the change of the reference signal caused by the interference of external factors such as temperature, vibration, and pollution, improves the robustness of the lubricating film thickness measurement of the sliding bearing, and has important engineering significance for the long-term and reliable monitoring of the lubricating film thickness of the sliding bearing friction pair.

[0044] Further, by calculating the proportional coefficient of the reflected echo of the bearing bush in the air medium and the substrate-liner interface reflected echo signal, the comprehensive response coefficient can be obtained, which can characterize the propagation law of sound waves in the bonding layer between the substrate and the liner, and provide a basis for calculating the lubricating film thickness by using the proportional coefficient.

[0045] Further, constructing a proportional coefficient by using the lubricating film reflected echo signal and the substrate-liner interface reflected echo signal can cancel the influence of all processes before the substrate-liner interface on the ultrasonic wave propagation, and can effectively avoid the problem of the change of the reference signal caused by the change of the binding force between the sensor and the substrate.

[0046] Furthermore, by comparing the reflection signals of air and the matrix-liner interface, the reflection characteristics of the interface itself are quantified, providing a benchmark for subsequent lubricating film signal analysis; the interference of hardware differences such as ultrasonic probes and couplants on the measurement is reduced, and the data consistency is improved.

[0047] Furthermore, common-mode noise is suppressed through proportional operations; the weak signals of the lubricating film caused by ultrasonic energy attenuation are prevented from being submerged, and the detection sensitivity of the thin film is improved.

[0048] Furthermore, the acoustic characteristics of the lubricating film are independently extracted. The amplitude spectrum reflects the acoustic impedance difference, and the phase spectrum reflects the propagation time, avoiding cross-interference; the influence of time-domain noise is weakened through frequency-domain analysis, and the data reliability is improved.

[0049] Furthermore, by combining the amplitude and phase information, the thickness is accurately inverted using the sound velocity, reflection time, or dispersion relationship model; non-uniform film layers or dynamic lubrication states can be processed, and the engineering applicability is improved.

[0050] It can be understood that the beneficial effects of the second to sixth aspects above can be referred to the relevant descriptions in the first aspect above, and will not be elaborated here.

[0051] In summary, the present invention systematically excludes interference factors through the step-by-step processing of the interface characteristics to the lubricating film signals; the ultrasonic technology does not require the destruction of the bearing structure and is suitable for on-line monitoring and life assessment; by combining the amplitude and phase information, the limitations of single-parameter measurement are broken through. Through step-by-step signal processing and feature extraction, the accuracy and robustness of the lubricating film thickness measurement of the sliding bearing are significantly improved, and it is applicable to high-precision industrial detection scenarios.

[0052] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts.

[0054] Figure 1 It is a signal processing flowchart of a high-robustness ultrasonic measurement method for the lubricating film thickness of a sliding bearing;

[0055] Figure 2 is a schematic diagram of the propagation of ultrasonic waves in the friction pair of a sliding bearing. Among them, Figure (a) is a schematic diagram of the propagation of ultrasonic waves in the friction pair of a sliding bearing in the pre-test link, and Figure (b) is a schematic diagram of the propagation of ultrasonic waves in the friction pair of a sliding bearing in the actual test;

[0056] Figure 3 It is a schematic diagram of a lubricating film thickness calibration test bench and an ultrasonic measurement system;

[0057] Figure 4 They are time-domain waveform diagrams of reference signal 1 and reference signal 2;

[0058] Figure 5 is an amplitude diagram and a phase diagram of the reflection coefficient of the lubricating film. Among them, Figure (a) is the amplitude diagram of the reflection coefficient of the lubricating film, and Figure (b) is the phase diagram of the reflection coefficient of the lubricating film;

[0059] Figure 6 is the calculation result and relative error of the lubricating film thickness in the calibration experiment. Among them, Figure (a) is the calculation result of the lubricating film thickness in the calibration experiment, and Figure (b) is the relative error between the calculation result of the lubricating film thickness and the actual value in the calibration experiment;

[0060] Figure 7 It is a schematic diagram of a computer device provided by an embodiment of the present invention;

[0061] Figure 8 It is a block diagram of an electronic device provided by an embodiment of the present invention.

[0062] Among them: 1. Micrometer; 2. Upper nut; 3. Clamping device; 4. Lower nut; 5. Moving steel column; 6. Calibration block; 60. Computer device; 61. Processor; 62. Memory; 63. Computer program; 600. Electronic device; 610. Processing unit; 620. Storage unit; 6201. Random access storage unit; 6202. Cache storage unit; 6203. Read-only storage unit; 6204. Program / utilities; 6205. Program module; 630. Bus; 640. Display unit; 650. Input / output interface; 660. Network adapter; 700. External device. Detailed implementation manners

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0064] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0065] It should also be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0066] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the contextually related objects.

[0067] It should be understood that although terms such as first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0068] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0069] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of the various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations. And those skilled in the art can design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0070] The present invention provides a method for measuring the ultrasonic proportionality coefficient of the lubricating film thickness of a sliding bearing. First, the comprehensive response coefficient of sound waves in the transition bonding layer between the matrix and the lining is obtained by calculating the proportionality coefficient between the echo signal reflected from the bearing bush of the sliding bearing in the air medium and the echo signal reflected from the matrix-lining interface; a proportionality coefficient is constructed based on the echo signal reflected from the lubricating film and the echo signal reflected from the matrix-lining interface, and the reflection coefficient of the lubricating film is calculated in combination with the comprehensive response coefficient of the sound waves in the transition layer of the matrix-lining joint surface; finally, the lubricating film thickness is solved according to the resonance model method or the composite model method.

[0071] The present invention constructs a proportionality coefficient by using the echo signal reflected from the lubricating film and the echo signal reflected from the matrix-lining interface collected by the sensor, calculates the reflection coefficient of the lubricating film in combination with the proportionality coefficient and the comprehensive response coefficient of the transition layer of the matrix-lining joint surface, is not affected by the change of the binding force between the sensor and the matrix, solves the problem of the change of the reference signal caused by the interference of external factors such as temperature, vibration, and pollution, improves the robustness of the measurement of the lubricating film thickness of the sliding bearing, and has important engineering significance for the long-term reliable monitoring of the lubricating film thickness of the friction pair of the sliding bearing.

[0072] Embodiment 1

[0073] Please refer to Figure 1 , which is the signal processing flow chart of the high-robustness ultrasonic measurement method for the lubricating film thickness of a sliding bearing; a method for measuring the ultrasonic proportionality coefficient of the lubricating film thickness of a sliding bearing according to the present invention includes the following steps:

[0074] S1. Construction of the comprehensive response coefficient CR(f);

[0075] Please refer to Figure 2, which is the propagation schematic diagram of ultrasonic waves in the friction pair of a sliding bearing. In the frequency domain, the incident signal is represented by I(f); the echo signal reflected from the lining-air interface collected in the pre-test session is represented by B ca1 (f), and the echo signal reflected from the matrix-lining interface collected is represented by B sc1 (f); a proportionality coefficient K1(f) is constructed by using the above signals, and the amplitude |K1(f)| and phase Φ K1 (f) of the proportionality coefficient K1(f) are obtained, and further the amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f) of the comprehensive response coefficient are obtained.

[0076] The proportionality coefficient K1(f) is specifically:

[0077]

[0078] The amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f) are specifically:

[0079]

[0080] Among them, |W sc | is the amplitude of the transmission coefficient at the matrix - layer interface; |W cs | is the amplitude of the transmission coefficient at the layer - matrix interface; α c is the attenuation coefficient of ultrasonic wave propagation in the layer; d c is the thickness of the layer; |V sc | is the amplitude of the reflection coefficient at the matrix - layer interface; t c is the propagation time of ultrasonic wave in the layer; is the phase of the transmission coefficient at the matrix - layer interface; is the phase of the transmission coefficient at the layer - matrix interface; is the phase of the reflection coefficient at the matrix - layer interface.

[0081] S2. Construction of the proportional coefficient K2(f);

[0082] Please refer to Figure 2, which is a schematic diagram of the propagation of ultrasonic waves in the friction pair of a sliding bearing. In actual tests, the lubricating film reflected echo signal collected is denoted as B co2 (f), and the reflected echo signal at the matrix - layer interface is denoted as B sc2 (f); Using the above - mentioned signals to construct the proportional coefficient K2(f), the amplitude spectrum |K2(f)| of the proportional coefficient and the phase spectrum Φ K2 (f) are obtained.

[0083] The proportional coefficient K2(f) is specifically:

[0084]

[0085] The amplitude spectrum |K2(f)| of the proportional coefficient and the phase spectrum Φ K2 (f) are specifically:

[0086]

[0087] Among them, |R(f)| is the amplitude of the lubricating film reflection coefficient; Φ R (f) is the phase of the lubricating film reflection coefficient.

[0088] S3. Separation of the lubricating film reflection coefficient R(f);

[0089] Combining the comprehensive response coefficient and the proportional coefficient in steps S1 and S2, the amplitude |R(f)| and the phase Φ R (f) of the lubricating film reflection coefficient are separated.

[0090] The amplitude spectrum |R(f)| and the phase spectrum Φ R (f) of the lubricating film reflection coefficient are specifically:

[0091]

[0092] Φ R (f) = Φ K2 (f) - 2πft c - Φ CR (f)

[0093] S4. Measurement of the lubricating film thickness of the sliding bearing.

[0094] According to the characteristics of the lubricating film reflection coefficient measured in step S3, select the composite model method or the resonance model method to calculate the lubricating film thickness.

[0095] When there is a minimum point phenomenon in the amplitude spectrum |R(f)| of the lubricating film reflection coefficient or a zero-crossing phenomenon in the phase spectrum Φ R (f) of the lubricating film reflection coefficient, the lubricating film thickness h is calculated using the resonance model method as follows:

[0096]

[0097] where m is the resonance order; f m is the minimum point frequency or the zero-crossing frequency; c o is the speed of ultrasonic wave propagation in the lubricating medium.

[0098] When there is no extreme point phenomenon in the amplitude spectrum |R(f)| of the lubricating film reflection coefficient, the lubricating film thickness h is calculated using the composite model method as follows:

[0099]

[0100] where V co is the reflection coefficient at the liner-lubricating film interface; V os is the reflection coefficient at the lubricating film-steel interface.

[0101] Those skilled in the art can understand that various aspects of the present invention can be implemented as a system, a method, or a program product. Therefore, various aspects of the present invention can be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation combining hardware and software aspects, which can be collectively referred to as "circuit", "module", or "platform" here.

[0102] Example 2

[0103] The present invention provides an ultrasonic proportional coefficient measurement system for the lubricating film thickness of a sliding bearing, which can be used to implement the above-mentioned ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing. Specifically, the ultrasonic proportional coefficient measurement system for the lubricating film thickness of a sliding bearing includes a coefficient module, a construction module, a separation module, and an output module.

[0104] Among them, the coefficient module calculates the proportional coefficient between the echo signal reflected by the bearing bush in the air medium and the echo signal reflected by the matrix-liner interface, and obtains the comprehensive response coefficient of the sound wave in the transition bonding layer between the matrix and the liner.

[0105] The construction module constructs a proportional coefficient based on the echo signal reflected by the lubricating film and the echo signal reflected by the matrix-liner interface.

[0106] The separation module separates the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportional coefficient and comprehensive response coefficient.

[0107] The output module calculates the lubricating film thickness based on the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

[0108] Embodiment 3

[0109] The present invention provides a terminal device, which includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Graphics Processing Unit (GPU), Tensor Processing Unit (TPU), Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of the ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing, including:

[0110] Calculate the proportionality coefficient between the reflected echo signal of the bearing bush in the air medium and the reflected echo signal of the matrix-liner interface, and obtain the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the liner; construct the proportionality coefficient based on the reflected echo signal of the lubricating film and the reflected echo signal of the matrix-liner interface; separate the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportionality coefficient and comprehensive response coefficient; calculate the thickness of the lubricating film according to the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

[0111] Please refer to Figure 7 , the terminal device is a computer device. The computer device 60 in this embodiment includes: a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When the computer program 63 is executed by the processor 61, it implements the method for measuring the ultrasonic proportionality coefficient of the lubricating film thickness of the sliding bearing in the embodiment. To avoid repetition, it will not be elaborated here one by one. Alternatively, when the computer program 63 is executed by the processor 61, it implements the functions of each model / unit in the system for measuring the ultrasonic proportionality coefficient of the lubricating film thickness of the sliding bearing in the embodiment. To avoid repetition, it will not be elaborated here one by one.

[0112] The computer device 60 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art can understand that Figure 7 merely examples of the computer device 60, which do not constitute a limitation on the computer device 60, may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the computer device may also include input / output devices, network access devices, buses, etc.

[0113] The so-called processor 61 may be a central processing unit (CPU), or may also be other general-purpose processors, a graphics processing unit (GPU), a tensor processing unit (TPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0114] The memory 62 can be an internal storage unit of the computer device 60, such as the hard disk or memory of the computer device 60. The memory 62 can also be an external storage device of the computer device 60, such as a plug-in hard disk equipped on the computer device 60, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc.

[0115] Furthermore, the memory 62 can also include both the internal storage unit of the computer device 60 and an external storage device. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 can also be used to temporarily store data that has been output or will be output.

[0116] Please refer to Figure 8 , the terminal device is the electronic device 600, and the electronic device 600 is presented in the form of a general computing device. The components of the electronic device can include but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different platform components (including the storage unit 620 and the processing unit 610), a display unit 640, etc.

[0117] Among them, the storage unit stores program codes, and the program codes can be executed by the processing unit 610, so that the processing unit 610 executes the steps according to various exemplary embodiments of the present invention described in the above method part of this specification. For example, the processing unit 610 can execute the steps as shown in Figure 1 .

[0118] The storage unit 620 can include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 6201 and / or a cache storage unit 6202, and can further include a read-only storage unit (ROM) 6203.

[0119] The storage unit 620 can also include a program / utility 6204 having a set (at least one) of program modules 6205. Such program modules 6205 include but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0120] The bus 630 can represent one or more of several types of bus structures, including a storage unit bus or a storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the multiple bus structures.

[0121] The electronic device 600 can also communicate with one or more external devices 700 (such as a keyboard, a pointing device, a Bluetooth device, etc.), and can also communicate with one or more devices that enable a user to interact with the electronic device 600, and / or communicate with any device that enables the electronic device 600 to communicate with one or more other computing devices (such as a router, a modem). Such communication can be carried out through the input / output interface 650. Moreover, the electronic device 600 can also communicate with one or more networks (such as a local area network, a wide area network, and / or a public network, such as the Internet) through the network adapter 660. The network adapter 660 can communicate with other modules of the electronic device 600 through the bus 630. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0122] Embodiment 4

[0123] The present invention also provides a storage medium, specifically a computer-readable storage medium, which is a memory device in a terminal device for storing programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and, of course, the extended storage medium supported by the terminal device. It can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, apparatus, or device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. And, in this storage space, one or more instructions suitable for being loaded and executed by a processor are also stored, and these instructions can be one or more computer programs (including program codes). It should be noted that more specific examples of the computer-readable storage medium here include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disc read-only memory, an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0124] The computer-readable storage medium also includes a data signal propagated in a baseband or as part of a carrier wave, which carries the readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium can also be any readable medium other than the readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber, radio frequency, etc., or any suitable combination of the above.

[0125] The program code for performing the operations of the present invention can be written in any combination of one or more programming languages. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user's computing device through any type of network, including a local area network or a wide area network, or can be connected to an external computing device (e.g., by using an Internet service provider to connect through the Internet).

[0126] One or more instructions stored in the computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the method for measuring the ultrasonic proportional coefficient of the lubricating film thickness in the above embodiments; one or more instructions in the computer-readable storage medium are loaded and executed by the processor to perform the following steps:

[0127] Calculate the proportional coefficient between the echo signal reflected from the bearing shell in the air medium and the echo signal reflected from the matrix-liner interface to obtain the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the liner; construct a proportional coefficient based on the lubricating film echo signal and the matrix-liner interface echo signal; separate the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportional coefficient and the comprehensive response coefficient; calculate the lubricating film thickness based on the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

[0128] In each of the embodiments provided in the present application, the databases involved may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. In each of the embodiments provided in the present application, the processors involved may be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logics, data processing logics based on quantum computing, etc., and are not limited thereto.

[0129] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0130] Experimental verification example:

[0131] Please refer to Figure 3 , and the effectiveness of the lubricating film thickness calibration experimental bench verification method is verified. The experimental device includes two parts: a displacement stage for adjusting the lubricating film thickness and an ultrasonic measurement system. Among them, the displacement stage for adjusting the lubricating film thickness includes a micrometer 1, an upper nut 2, a clamping device 3, a lower nut 4, a moving steel column 5, and a calibration block 6. The calibration block 6 is installed on the base, and the ultrasonic sensor is installed at the bottom of the calibration block 6 through high-temperature glue. The moving steel column 5 is connected to the clamping device 3 through the upper nut 2 and the lower nut 4.

[0132] By machining a small cylinder (diameter Φ5mm × thickness 5mm) on the calibration block 6, the surface tension of the lubricating film is reduced to form a thinner lubricating film. At the same time, a 2mm babbitt lining is machined on the small cylinder. By dropping lubricating oil on the small cylinder of the calibration block 6 and then adjusting the micrometer 1, the lubricating film thickness can be changed. The height adjustment range of the micrometer 1 is 0-18mm, and the resolution is 10μm.

[0133] The ultrasonic measurement system includes an ultrasonic sensor, an ultrasonic pulse transmitter-receiver, a digital acquisition card, and a computer. The ultrasonic pulse transmitter-receiver controls the ultrasonic sensor to emit ultrasonic waves. The ultrasonic waves are incident on structures such as the calibration block 6 and the lubricating oil layer, and reflection and transmission phenomena occur at each interface. The reflected echo signals are collected by the acquisition card and sent to the computer for data processing.

[0134] First, conduct a pre-test session to collect the ultrasonic reflected echo signals in the air state, denoted as reference signal 1;

[0135] Denote the reflected echo signal at the liner-air interface in reference signal 1 as B ca1 (f), and denote the reflected echo signal at the substrate-liner interface as B sc1 (f), and use the above signals to construct the proportionality coefficient K1(f), and obtain the amplitude |K1(f)| and phase Φ K1 (f) of the proportionality coefficient K1(f), and further obtain the amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f).

[0136] Secondly, place the calibration block 6 into the heating box, heat it to 80 degrees Celsius and then let it cool naturally to simulate the change in the bonding force between the ultrasonic sensor and the substrate;

[0137] After the calibration block 6 has cooled to room temperature, collect the ultrasonic reflected echo signals in the air state again, denoted as reference signal 2. Please refer to Figure 4 , the time-domain waveform diagrams of reference signal 1 and reference signal 2. It can be found that after the bonding force between the ultrasonic sensor and the substrate changes, the reference signal changes. Therefore, when using the traditional method based on the reference signal to calculate the lubricating film thickness, a new reference signal needs to be collected before each test to calculate the accurate lubricating film thickness. To illustrate the high robustness of this method, the lubricating film thickness will be calculated based on reference signal 1 using this method in the following.

[0138] Subsequently, install the calibration block on the lubricating film thickness calibration test bench to conduct a calibration experiment. Drop the lubricating oil onto the small cylinder of the calibration block, adjust the micrometer 1 to generate a thick oil film within the resonance model area, and use it as a reference. Then use the micrometer 1 to gradually reduce the lubricating film thickness from the resonance model area to the spring model area. During this process, take the difference between the initial lubricating film thickness and the displacement increment of the micrometer as the actual lubricating film thickness, record the ultrasonic reflected echo signals corresponding to each lubricating film thickness, and denote the lubricating film reflected echo signals collected in the calibration experiment as B co2 (f), denote the reflected echo signal at the substrate-liner interface as B sc2 (f), and then use the above signals to construct the proportionality coefficient K2(f), and obtain the amplitude spectrum |K2(f)| of the proportionality coefficient and the phase spectrum Φ K2 (f).

[0139] Then, combine the comprehensive response coefficient obtained in the pre-test session and the proportionality coefficient obtained in the calibration experiment to calculate the amplitude and phase of the lubricating film reflection coefficient. The calculation results are shown in Figure 5, the amplitude diagram and phase diagram of the oil film reflection coefficient.

[0140] Finally, according to the characteristics of the amplitude and phase diagrams of the lubricating film reflection coefficient, the composite model method or the resonance model method is selected to calculate the lubricating film thickness. Please refer to Figure 6 to calibrate the calculation results and relative errors of the lubricating film thickness in the calibration experiment. In the legend, "proportionality coefficient" represents the calculation results and relative errors using this method based on reference signal 1, "traditional method 1" represents the calculation results and relative errors using the traditional method based on reference signal 1, and "traditional method 2" represents the calculation results and relative errors using the traditional method based on reference signal 2. It can be found that there is good consistency between the calculated lubricating film thickness using this method and the actual value, with a small error. When the lubricating film thickness is in the spring model method region, the relative error is within 2%; when the lubricating film thickness is in the blind region, the relative errors of 86% of the data are within 5%, and the maximum relative error is 10%; when the lubricating film thickness is in the resonance model region, the relative error is within 1%, which is basically consistent with the calculation result accuracy of the lubricating film thickness after updating the reference signal, indicating that this method can maintain the same accuracy as the traditional method. When calculating the lubricating film thickness using the traditional method, if the reference signal is not updated, the relative errors of 77% of the data outside the resonance model region are greater than 20%, and the maximum error reaches 38%, and the consistency between the calculation result and the actual value is very poor. This shows that the method of the present invention has good ability in resisting the change of the binding force between the sensor and the matrix, and has strong anti-interference ability. Therefore, the method of the present invention has high robustness in the measurement of the lubricating film thickness.

[0141] In summary, for the ultrasonic proportionality coefficient measurement method and system for the lubricating film thickness of a sliding bearing of the present invention, a proportionality coefficient is constructed using the oil film reflection signal collected by the sensor and the echo signal reflected from the matrix-liner interface, and the lubricating film reflection coefficient is calculated by combining the proportionality coefficient and the comprehensive response coefficient of the transition layer of the matrix-liner joint surface. It is not affected by the change of the binding force between the sensor and the matrix, solves the problem of the change of the reference signal caused by the interference of external factors such as temperature, vibration, and pollution, improves the robustness of the measurement of the lubricating film thickness of the sliding bearing, and has important engineering significance for the long-term reliable monitoring of the lubricating film thickness of the friction pair of the sliding bearing.

[0142] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be assigned to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0143] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present invention can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0145] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are only illustrative. For example, the division of the module or unit is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the device or unit can be in electrical, mechanical or other forms.

[0146] The unit described as a separated component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0147] In addition, in each embodiment of the present invention, each functional unit may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0148] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above method embodiments of the present invention, it may also be completed by instructing relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above method embodiments may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0149] This application is described with reference to the flowcharts and / or block diagrams of methods, devices, and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate a device for implementing the specified function in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0150] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the process in Figure 1One or more processes and / or blocks Figure 1 The functions specified in one or more blocks.

[0151] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 One or more processes and / or blocks Figure 1 The steps of the functions specified in one or more blocks.

[0152] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention.

Claims

1. A method for measuring the ultrasonic proportionality coefficient of the lubricating film thickness of a sliding bearing, characterized in that, It includes the following steps: Calculate the proportionality coefficient between the echo signal reflected from the bearing bush in the air medium and the echo signal reflected from the matrix-lining interface, and obtain the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the lining; Construct the proportionality coefficient based on the echo signal reflected from the lubricating film and the echo signal reflected from the matrix-lining interface; Separate the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportionality coefficient and comprehensive response coefficient; The lubricating film thickness calculated according to the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

2. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 1, wherein The comprehensive response coefficient is specifically: Collect the reflected echo signal of the sliding bearing in the air state, and utilize the obtained reflected echo signal B of the liner-air interface ca1 (f) and the reflected echo signal B of the matrix-liner interface sc1 (f) to construct the proportionality coefficient K1(f), and obtain the amplitude |K1(f)| and phase Φ of the proportionality coefficient K1(f) K1 (f), and further obtain the amplitude spectrum |CR(f)| of the comprehensive response coefficient and the phase spectrum Φ CR (f).

3. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 2, characterized in that, Magnitude spectrum of the comprehensive response coefficient |CR(f)| and phase spectrum Φ CR (f) are specifically as follows: where, |W sc | is the amplitude of the transmission coefficient at the matrix - layer interface; |W cs | is the amplitude of the transmission coefficient at the layer - matrix interface; α c is the attenuation coefficient of ultrasonic wave propagation in the layer; K1(f) is the proportionality coefficient; d c is the thickness of the layer; |V sc | is the amplitude of the reflection coefficient at the matrix - layer interface; t c is the time of ultrasonic wave propagation in the layer; is the phase of the transmission coefficient at the matrix - layer interface; is the phase of the transmission coefficient at the layer - matrix interface; is the phase of the reflection coefficient at the matrix - layer interface.

4. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 1, characterized in that Construct the proportionality coefficient based on the echo signal reflected from the lubricating film and the echo signal reflected from the matrix-lining interface, specifically: Utilize the lubricating film reflected echo signal B collected through actual tests co2 (f) and the reflected echo signal B sc2 (f) of the substrate - liner interface to construct the proportionality coefficient K2(f), and obtain the amplitude spectrum |K2(f)| and the phase spectrum Φ K2 (f).

5. The ultrasonic proportionality coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 4, wherein Magnitude spectrum of the proportionality coefficient |K2(f)| and phase spectrum Φ K2 (f) are specifically as follows: where, |R(f)| is the amplitude of the reflection coefficient of the lubricating film; Φ R (f) is the phase of the reflection coefficient of the lubricating film, |W sc | is the amplitude of the transmission coefficient of the substrate - layer interface, |W cs | is the amplitude of the transmission coefficient of the layer - substrate interface, α c is the attenuation coefficient of the ultrasonic wave propagating in the layer, d c is the thickness of the layer, |V sc | is the amplitude of the reflection coefficient of the substrate - layer interface, f is the frequency, t c is the time for the ultrasonic wave to propagate in the layer, is the phase of the transmission coefficient of the substrate - layer interface; is the phase of the transmission coefficient of the layer - substrate interface; is the phase of the reflection coefficient of the substrate - layer interface.

6. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 1, characterized in that Amplitude spectrum of lubricating film reflection coefficient |R(f)| and phase spectrum Φ of lubricating film reflection coefficient Φ(f) are specifically as follows: R (f) Specifically: Φ R ψ(f) = Φ K2 ψ(f) - 2πft c -Φ CR ψ(f) Among them, |K2(f)| is the amplitude spectrum of the proportionality coefficient, Φ K2 (f) is the phase spectrum of the proportionality coefficient, |CR(f)| is the amplitude spectrum of the comprehensive response coefficient, α c is the attenuation coefficient of ultrasonic wave propagation in the liner, d c is the thickness of the liner, f is the frequency, t c is the propagation time of ultrasonic wave in the liner, Φ CR (f) is the phase spectrum of the comprehensive response coefficient.

7. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 1, wherein According to the characteristics of the lubricating film reflection coefficient, when there is a minimum point phenomenon in the amplitude spectrum |R(f)| of the lubricating film reflection coefficient or a zero-crossing phenomenon in the phase spectrum Φ R (f) of the lubricating film reflection coefficient, the lubricating film thickness h is calculated using the resonance model method; when there is no extreme point phenomenon in the amplitude spectrum |R(f)| of the lubricating film reflection coefficient, the lubricating film thickness h is calculated using the composite model method.

8. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of a sliding bearing according to claim 7, wherein Calculate the lubricating film thickness h using the resonance model method as follows: where m is the resonance order; f m is the minimum point frequency or the zero-crossing frequency; c o is the propagation velocity of ultrasonic waves in the lubricating medium.

9. The ultrasonic proportional coefficient measurement method for the lubricating film thickness of the sliding bearing according to claim 7, characterized in that Calculate the lubricating film thickness h using the composite model method as follows: Among them, V co is the reflection coefficient of the liner-lubricating film interface; V os is the reflection coefficient of the lubricating film-steel interface, c o is the propagation speed of ultrasonic waves in the lubricating medium, and f is the frequency.

10. An ultrasonic proportional coefficient measurement system for the lubricating film thickness of a sliding bearing, characterized in that, It includes: A coefficient module that calculates the proportionality coefficient between the echo signal reflected from the bearing bush in the air medium and the echo signal reflected from the matrix-lining interface, and obtains the comprehensive response coefficient of the acoustic wave in the transition bonding layer between the matrix and the lining; A construction module that constructs the proportionality coefficient based on the echo signal reflected from the lubricating film and the echo signal reflected from the matrix-lining interface; A separation module that separates the lubricating film reflection coefficient into the amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient according to the obtained proportionality coefficient and comprehensive response coefficient; An output module that calculates the lubricating film thickness according to the obtained amplitude spectrum of the lubricating film reflection coefficient and the phase spectrum of the lubricating film reflection coefficient.

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