Online lubricating liquid monitoring method and system based on main path multi-parameter sensor

Abstract

The invention discloses a lubricating liquid on-line monitoring method and system based on a main path multi-parameter sensor, and relates to the technical field of fluid detection, and the method comprises the following steps: S1, respectively attaching optical fiber strain bands to the upstream and downstream of a main oil path valve group, and arranging a micro-pressure sampling hole to obtain a continuous flow velocity signal and a continuous pressure signal; the flow velocity signal and the pressure signal are interwoven to form flow velocity and pressure stripes, rhythm changes of shear disturbance are extracted, and a shear resonance indication band is generated; and S2, analyzing the reverse wave crest alternating position of the flow velocity and the pressure in the shear resonance indication band, identifying a starting point and an ending point of phase inversion, extracting a pulse envelope, and generating a reverse impact fingerprint for calibrating the offset characteristic of the sensor diaphragm. Through shear identification, impact fingerprint extraction, diaphragm buffering, differential pressure conversion and phase dislocation pressure relief, a closed-loop regulation and control mechanism is constructed, the accuracy and stability of lubrication monitoring under a high-frequency dynamic state are improved, the misjudgment rate is reduced, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid detection, in particular to a lubricating liquid online monitoring method and system based on a main path multi-parameter sensor. BACKGROUND

[0002] The lubricating liquid online monitoring based on the main path multi-parameter sensor is that an intelligent sensing system with high-sensitivity acquisition capability is arranged on a device lubricating main oil path, and through integration of multiple sensing units such as pressure, temperature, flow, dielectric constant, particle contamination, moisture content, conductivity and viscosity, the key physical and chemical characteristics of the lubricating liquid in the running process are continuously monitored. The intelligent sensing system sends the multi-source signals into a data fusion algorithm link in real time, performs correlation analysis, and forms a dynamic judgment on the lubricating performance change, contamination level and degradation trend. Compared with the traditional offline sampling mode, the monitoring method can identify the lubricating abnormality in real time when the device is in load operation, find hidden troubles such as oil aging, leakage or impurity invasion in advance, support predictive maintenance and process decision, and effectively improve the safety, stability and reliability of the device operation.

[0003] The prior art has the following disadvantages: In the prior art, the lubricating liquid online monitoring system usually relies on the pressure sensor and the flow sensor installed in the main oil path to collect and analyze the lubricating state in real time. However, in the dynamic running scene where the valve group in the main oil path is in instantaneous opening and closing action, the original stable laminar structure inside the oil path will be disturbed quickly, and the direction of flow rate change in the local shear layer and the direction of pressure change will appear anti-phase resonance phenomenon. Such anti-phase vibration will form a high-amplitude impact in a very short time, so that the sensor sensitive diaphragm bears a nonlinear pulse action, thereby generating a slight displacement drift. Once the diaphragm is offset, the sensor output signal deviates from the real fluid state, resulting in a significant error in calculating the oil film thickness when the monitoring system is used. The above problems will cause the lubricating state evaluation result to deviate, increase the risk of misjudging the oil film degradation trend, and further interfere with the device operation stability and maintenance strategy making.

[0004] The above information disclosed in the background section is only used to enhance the understanding of the background of the present disclosure, and therefore it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present application is to provide a lubricating liquid online monitoring method and system based on a main path multi-parameter sensor to solve the problems in the background.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: a lubricating liquid online monitoring method based on a main path multi-parameter sensor, comprising the following steps: S1, respectively, attach fiber optic strain bands upstream and downstream of the main oil way valve group and set up micro pressure sampling holes to obtain continuous flow rate signals and continuous pressure signals, interleave the flow rate signals and the pressure signals to form flow rate pressure stripes, extract the rhythm change of shear disturbance, and generate a shear resonance indication band; S2, analyze the alternating positions of the reverse wave peaks in the shear resonance indication band, identify the starting point and the end point of the phase inversion, extract the pulse envelope, and generate a reverse impact fingerprint for calibrating the offset characteristics of the sensor diaphragm; S3, superimpose a detachable thin layer on the outside of the sensor sensitive diaphragm to form a controlled buffer area on the diaphragm surface corresponding to the impact energy of the reverse impact fingerprint, and determine the boundary position of the diaphragm offset through the rebound deformation of the thin layer; S4, according to the boundary position of the diaphragm offset, add a micro-volume bypass cavity outside the main oil way valve group to convert the diaphragm offset signal into a controllable pressure difference, construct a pressure difference translation chain, and form a double-valve phase traction window; S5, according to the timing output result of the double-valve phase traction window, implement driving control staggered with the opening and closing rhythm of the valve group, and simultaneously trigger the reversible micro-jet relief device to implement pressure relief instantaneously before the impact peak arrives, weaken the amplitude of the reverse wave, realize closed-loop control, and thus maintain the flow field stability of the main oil way and ensure the accuracy of the monitoring signal.

[0007] Preferably, step S1 comprises: Performing structural pretreatment before and after the main oil way valve group, scratching micro-grooves on the outer wall of the oil pipe through laser surface etching, and attaching fiber optic strain bands; Setting up micro pressure sampling holes downstream of the valve group to obtain flow rate signals and pressure signals; time delay correction is performed on the flow rate signals and the pressure signals, and the flow rate signals and the pressure signals are interleaved to form flow rate pressure stripes; Performing frequency scanning identification based on the stripe sequence, extracting stripe segments with prominent phase changes and marking disturbance significant intervals; Mapping the disturbance significant intervals back to the main oil way to generate a shear resonance indication band.

[0008] Preferably, step S2 comprises: Extracting flow rate signal and pressure signal stripe sequences based on the shear resonance indication band, and constructing reverse wave peak alternating sequences; Tracking the time interval change of the reverse wave peak combination to identify the starting point and the end point of the phase inversion; Extracting the fluctuation difference and direction change around the phase inversion section to pull out the pulse envelope curve; Extracting impact feature coordinates according to the pulse envelope and performing matching identification to generate a reverse impact fingerprint containing multi-dimensional features.

[0009] Preferably, the impact feature coordinates include the main peak position, the main peak amplitude, the main peak width and the difference in two-sided symmetry in the phase inversion interval, for improving the accuracy of impact behavior recognition.

[0010] Preferably, step S3 comprises: The outer side of the sensor sensitive diaphragm is applied with an unloadable elastic thin layer coating material by a constant speed blade coating process to form a buffer contact layer covering the vibration area; After the coating is completed, a physical loading experiment is implemented by the exciter and the rebound amount change is recorded to establish a mapping relationship between the rebound deformation amount and the impact energy; The transient rebound deformation amount at different positions is measured, the effective displacement path is calculated combined with the diaphragm boundary response, and a displacement boundary map is constructed; The displacement boundary map is corresponded with the main peak position of the impact fingerprint to complete the bidirectional mapping of the outer rebound feature and the diaphragm structure response.

[0011] Preferably, the displacement boundary map forms a rebound deformation evolution trend map through the maximum thin layer rebound displacement and the rebound growth rate recorded in multiple start-stop impact loading experiments, for identifying the critical point of the diaphragm entering the nonlinear deformation stage in advance.

[0012] Preferably, step S4 comprises: A micro-volume cavity is set outside the sensor diaphragm structure to receive the displacement amount caused by the diaphragm offset, which is converted into a continuous pressure disturbance; The pressure disturbance is guided into the flexible closed channel to form a pressure difference signal, which drives the micro diaphragm valves arranged in opposite directions at the end of the channel to open successively; A compressible pipeline combination structure is arranged between the double diaphragm valves to form a flow limiting path to realize the time offset of the double valve responses; A phase traction window is generated according to the difference between the response times of the double valves to realize flexible following control of the opening and closing rhythm of the main oil valve group.

[0013] Preferably, the flow limiting path is composed of a deformable cavity with a minimum inner diameter smaller than the valve port diameter of the micro diaphragm valve, for applying shear resistance during the conduction of the micro pressure disturbance to realize phase offset control of the double valve responses.

[0014] Preferably, step S5 comprises: The difference between the response times is extracted based on the response paths of the double valves to construct a phase inversion driving curve and adjust the opening and closing rhythm of the main valve through the deformation sheet structure; A reversible micro-jet relief device is added downstream and combined with the impact early warning node to trigger the release of the elastic sealing sheet to form a local pressure drop to offset the impact energy; The nozzle closure and cavity reset are realized by the shape memory alloy spring; The double-valve rhythm is combined to maintain the out-of-phase state, and a continuous closed-loop process of main valve driving, pressure relief triggering, jet relief pressure and structure resetting is completed.

[0015] The lubricating liquid online monitoring system based on a main path multi-parameter sensor comprises a shear disturbance sensing module, an impact feature extraction module, a diaphragm buffer protection module, an offset pressure difference translation module and a dynamic flow field regulation module. The shear disturbance sensing module is provided with a fiber optic strain band and a micro-pressure sampling hole at the upstream and downstream of the main oil way valve group respectively to obtain continuous flow rate signals and continuous pressure signals, interweaves the flow rate signals and the pressure signals to form flow rate pressure stripes, extracts the rhythm change of shear disturbance, and generates a shear resonance indication band. The impact feature extraction module analyzes the reverse wave peak alternating position of the flow rate and the pressure in the shear resonance indication band, identifies the start point and the end point of phase inversion, extracts the pulse envelope, and generates a reverse impact fingerprint for calibrating the offset feature of the sensor diaphragm. The diaphragm buffer protection module is provided with a detachable thin layer coating outside the sensor sensitive diaphragm to form a controlled buffer area of impact energy corresponding to the reverse impact fingerprint on the diaphragm surface, and determines the boundary position of diaphragm offset through the rebound deformation of the thin layer. The offset pressure difference translation module adds a micro-volume bypass cavity outside the main oil way valve group according to the boundary position of diaphragm offset to convert the diaphragm offset signal into a controllable pressure difference, constructs a pressure difference translation chain, forms a double-valve phase traction window, and implements the driving control of the valve group in a staggered position. The dynamic flow field regulation module implements the driving control in a staggered position with the opening and closing rhythm of the valve group according to the time sequence output result of the double-valve phase traction window, simultaneously triggers the reversible micro-jet relief device, implements pressure relief instantaneously before the impact peak arrives, weakens the amplitude of the reverse wave, realizes closed-loop regulation, and thus maintains the flow field stability of the main oil way and guarantees the accuracy of the monitoring signal.

[0016] In the above technical solution, the present application provides technical effects and advantages: The present application extracts the shear rhythm by constructing flow rate pressure stripes, generates a reverse impact fingerprint, constructs a diaphragm buffer limit, converts a pressure difference signal, drives a double-valve out-of-phase response, and then links a micro-jet device to realize active pressure relief, finally forms an impact release and flow field stability mechanism with rapid response and closed-loop coordination. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0018] Figure 1 The method flow chart of the lubricating liquid online monitoring method based on the main road multi-parameter sensor of the present application.

[0019] Figure 2 The module schematic diagram of the lubricating liquid online monitoring system based on the main road multi-parameter sensor of the present application. DETAILED DESCRIPTION

[0020] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art.

[0021] The present application provides a lubricating liquid online monitoring method based on a main road multi-parameter sensor as shown in Figure 1 The method flow chart of the lubricating liquid online monitoring method based on the main road multi-parameter sensor of the present application, comprising the following steps: S1, respectively attaching optical fiber strain bands on the upstream and downstream of the main oil way valve group and setting micro pressure sampling holes to obtain continuous flow rate signals and continuous pressure signals, interleaving the flow rate signals and the pressure signals to form flow rate pressure stripes, extracting the rhythm change of shear disturbance, and generating shear resonance indication bands; In order to accurately perceive the perturbation characteristics of the lubricating liquid flow field under dynamic conditions, a method for establishing a shear disturbance identification path on the upstream and downstream of the main oil way valve group is proposed, which is used to construct a shear resonance indication band and realize the identification and intervention of subsequent impact behavior. The specific steps are as follows: In the device main oil circuit, the valve group is selected within the range of 100 mm before and after the pipe section for structure pretreatment, which specifically includes micro-groove scratching on the outer wall of the oil pipe through laser surface etching technology, so that the optical fiber strain band can be more stably attached and maintain axial tension after attachment. Then, the optical fiber strain band is attached in the pretreatment area, the attachment direction is strictly parallel to the main oil flow direction, and high-performance epoxy encapsulation glue is used for fixation. The optical fiber strain band selects a miniature grating array structure with wavelength stability better than 0.05 nanometers and response time less than 5 milliseconds, which can realize real-time response capability of more than 100 hertz when the flow rate changes more than 0.1 meters per second. At the same time, a micro-pressure sampling hole with a diameter of 0.8 mm is opened outside the attached area 30 mm downstream of the valve group using laser drilling technology, and the hole depth is controlled at 80% of the oil pipe wall thickness, and a ceramic capillary guide pipe is provided inside to ensure a smooth micro-pressure extraction path under high pressure pulsation.

[0022] The obtained continuous flow rate information and continuous pressure information are respectively pretreated through independent signal amplification circuits and are aligned with a synchronous time reference. To improve signal coupling accuracy, a time delay correction method based on spectral matching is used to make each mutation point of the flow rate signal and the micro-peak value of the pressure signal accurately coincide in the time dimension. On the basis of the aligned data, each group of time sequence flow rate and corresponding pressure sampling points are cross-mapped to construct a group of flow rate pressure comparison array. On this basis, a window sliding interval of 20 milliseconds is used to analyze the corresponding relationship between the flow rate growth rate and the pressure micro-decline segment, find the coupling segment of the rapid lifting of the flow rate and the sudden drop of the pressure, and then form a flow rate pressure stripe sequence with spatial and time coupling characteristics. The stripe presents a periodic overlapping interference form, which can significantly reflect the rhythm change of the flow field caused by the shear layer disturbance.

[0023] Based on the stripe sequence, further frequency scanning identification of rhythm change is performed. By statistically analyzing the peak density of the flow rate pressure stripe in different time periods, the frequency interval of the disturbance is identified. Test data shows that when the valve group opening and closing frequency reaches more than 12 times per minute, the probability of density mutation in the flow rate pressure stripe increases to more than 82%, which is significantly higher than that in the low-frequency opening and closing working condition of the valve group. On this basis, the stripe cluster corresponding to the disturbance frequency is extracted, and the amplitude difference between adjacent peaks is calculated to select the stripe segment with prominent phase change. Each significant wave segment contains a group of reverse transition mode composed of flow rate acceleration and pressure sudden drop, which preliminarily reveals the formation position and evolution trend of the shear disturbance region. By labeling the disturbance significant interval, a shear resonance early warning region is formed.

[0024] The identified shear resonance warning area is integrated, and its spatial position is mapped back to the actual structure of the main oil circuit to form a shear resonance indication band with real-time flow field correspondence. The indication band not only contains the disturbance starting point, maximum shear rate position and duration information, but also can superimpose the resonance node position of the flow velocity and pressure inverse response, realizing the multi-parameter fusion expression in three-dimensional space and time dimension. In an actual working condition test, when the device load suddenly rises by 25%, the inverse wave band in the indication band increases from the original 6 times per second to more than 15 times per second, and its duration expands from 150 milliseconds to 430 milliseconds, successfully revealing the non-steady-state expansion process of the shear layer in a short time. Through multi-dimensional interpretation of the shear resonance indication band, a highly stable and valuable reference path for subsequent identification of impact rhythm and calibration of diaphragm offset boundary can be provided.

[0025] S2, analyze the alternating positions of the flow velocity and pressure inverse wave peaks in the shear resonance indication band, identify the starting point and ending point of the phase inversion, extract the pulse envelope, and generate the inverse impact fingerprint for calibrating the offset characteristics of the sensor diaphragm; To further realize the accurate identification of fluid impact behavior under the influence of shear disturbance, a method is needed to be constructed based on the generated shear resonance indication band to analyze the phase inversion relationship between flow velocity and pressure and extract the inverse impact characteristics as a reference for diaphragm offset calibration. The specific steps are as follows: Based on the constructed shear resonance indication band, the original stripe sequence of the flow velocity signal and the pressure signal is extracted on the indication band, and the peak positions of the two signals are compared at equal time intervals. In the test process, the time window is selected as a continuous data segment of 50 milliseconds, and the relative time interval between the peak position of the flow velocity fluctuation curve and the valley position of the pressure fluctuation curve in each time segment is counted. When the time interval is stable within ±2 milliseconds and appears continuously for more than five groups, it is determined that the flow velocity and pressure have occurred in the section. Inverse synchronous changes. In the test sample, when the valve group action frequency reaches more than 20 times per minute, the average occurrence frequency of such inverse peak combination increases to 12 groups per second, which is significantly higher than the 4 groups per second under low frequency conditions, indicating that the shear disturbance is significantly enhanced. On this basis, all flow velocity peaks and pressure valleys that meet the above conditions are extracted, and the inverse peak alternating sequence is constructed as the input basis for subsequent impact behavior analysis.

[0026] Based on the alternating sequence, the trend of time interval change between each group of reverse wave peak combination is continuously tracked, and the sequence segment with wave peak combination interval less than 10 milliseconds and amplitude greater than twice the average value of normal steady-state change is screened out. This sequence segment is often located in the front edge or core area of the strong shear disturbance area, and is the precursor stage of the formation of impact energy. The above- screened sequence is compared in forward and backward trend, the wave peak turning point is identified, and the starting point and ending point of phase inversion in each reverse sequence are marked. In experimental measurement, if the time span between the starting point and the ending point exceeds 80 milliseconds and the fluctuation range covers more than three times the normal amplitude, it is confirmed as a significant phase inversion segment. In a typical group of data, the average duration of the phase inversion segment is 120 milliseconds, and the maximum duration reaches 270 milliseconds. The phase inversion segment is the fundamental triggering area of the impact behavior, and has important guiding significance for the energy accumulation trend in the fluid medium.

[0027] Around each phase inversion segment, the coupling rate change between the rising edge of flow velocity fluctuation and the falling edge of pressure fluctuation in the segment is further extracted, and the pulse profile of the segment is constructed. By comparing the amplitude difference and the number of fluctuation direction reversals between the flow velocity curve and the pressure curve point by point, the position of fluctuation intensification is extracted, and the overall pulse envelope curve is drawn. In a typical scenario, the main peak amplitude of the pulse envelope reaches 5.7 times the amplitude of the steady-state fluctuation, and the average fluctuation period before and after the main peak is shortened from 17 milliseconds in the steady state to 7 milliseconds, which clearly shows the formation process of high-frequency impact behavior. All pulse envelope curves are normalized and superimposed to form a unified impact signal description curve. The curve contains four dimensions of information: the starting point of impact formation, the main peak position, the decay trend and the recovery period, providing a data structure basis for the generation of subsequent impact fingerprints.

[0028] According to the impact signal description curve, the main peak position, main peak amplitude, main peak width and side symmetry difference of each main impact segment are extracted, and the characteristic coordinates of the impact behavior are constructed. The characteristic coordinate combination is used as the impact recognition standard template and applied to the shear resonance indication band under different working conditions for back testing, and the impact instances conforming to the characteristics are extracted, and finally the anti-phase impact fingerprint is generated. The fingerprint records the phase inversion interval of each group of anti-phase wave peaks, the main peak position of the impact pulse, the impact amplitude change rate and its duration, etc. In a group of high-frequency tests, the average recognition rate of the impact behavior identified by the fingerprint reaches more than 96%, which significantly improves the accuracy of the membrane deflection precursor recognition. By mapping the fingerprint structure to the sensor structure response model, it can be used as a core reference basis for membrane displacement boundary analysis and provide accurate targets for subsequent structure intervention design.

[0029] S3, superimpose a detachable thin layer coating on the outside of the sensor sensitive diaphragm, form a controlled buffer area on the diaphragm surface corresponding to the impact energy of the reverse impact fingerprint, and determine the boundary position of the diaphragm displacement through the rebound deformation of the thin layer; To further cope with the energy impact problem revealed by the reverse impact fingerprint, a buffer mechanism needs to be constructed at the sensor structure level to effectively weaken the impact energy on the diaphragm surface, while realizing the identification and calibration of the diaphragm displacement boundary. The specific steps are as follows: On the basis of the completion of the reverse impact fingerprint generation, the time span covered by the impact main peak section is selected, and the impact amplitude value in this time window is converted into the estimated energy density interval. Based on this energy density, a kind of elastic polymer coating material with detachable characteristics is selected as the coating material on the outside of the diaphragm. The preferred thickness is between 0.12 millimeters and 0.2 millimeters, the glass transition temperature is not less than 125 degrees Celsius, and the elongation rate exceeds 150%. Fluorosilicone rubber composite material, and through low temperature plasma surface pretreatment technology, the uniform microporous layer is formed between the coating material and the metal diaphragm, which improves the local deformation ability of the thin layer under impact. Subsequently, a constant speed coating process is used to uniformly spread the coating material on the outer surface of the diaphragm, covering the entire vibration area of the diaphragm and extending to the fixed edge 1.5 millimeters, ensuring that a complete buffer contact layer is formed on the impact conduction path.

[0030] After the thin layer coating on the diaphragm surface is completed, the impact area of the known impact fingerprint is subjected to physical simulation loading experiment, and the exciter is used to implement energy injection according to the fingerprint main peak amplitude, frequency and action time. During the loading process, the thin layer surface deformation curve is continuously monitored by a high-precision laser interference displacement measuring instrument, and the rebound period and deformation recovery rate are recorded in real time. In multiple repeated loading experiments, the rebound amount variation law of the thin layer under the same impact conditions is recorded, and the mapping relationship between the deformation amount and the input impact energy is established according to the statistical mean value. For example, when the injected impact energy density is 8.3 joules per square centimeter, the maximum rebound displacement of the thin layer surface is 37 microns, and the rebound process is basically completed within 21 milliseconds, indicating that the coating structure has good elastic buffer performance.

[0031] After the thin layer rebound performance calibration is completed, for each impact response, the thin layer surface deformation distribution map is drawn by measuring the transient rebound deformation of the thin layer at different positions, and further combined with the boundary response characteristics of the diaphragm material, the effective displacement path of the sensor sensitive diaphragm under the impact is calculated. The point with the highest deformation in the path corresponds to the maximum value of the diaphragm displacement response, which can be combined with the diaphragm thickness, elastic modulus and fixed condition to calculate the strain field distribution of the overall structure. Based on multiple sets of test data, it is found that when the maximum rebound of the outer thin layer of the diaphragm exceeds 30 microns, the edge response of the diaphragm body is obviously enhanced, which is easy to lead to the fatigue of the edge sealing structure, so the position corresponding to the rebound of 30 microns can be used as the displacement limit point of the diaphragm. Based on this, a complete displacement boundary map is constructed, which is used as the diaphragm performance monitoring benchmark.

[0032] The displacement boundary map is corresponded with the main peak position in the impact fingerprint, the bidirectional mapping of impact behavior and diaphragm structure response is completed, so that each impact can be reflected by the rebound response of the external thin layer. Through continuous data recording and superposition analysis under multiple opening and closing impacts, the thin layer rebound deformation evolution trend diagram is established, which can identify the critical point and degradation trend of diaphragm displacement in advance. In practical application, when the continuous impact causes the maximum displacement growth rate of the thin layer rebound to exceed 15%, it can be predicted that the diaphragm has entered the nonlinear deformation stage, prompting the need for structure maintenance or replacement. In this way, not only the controlled buffering of impact energy is realized, but also the quantitative correlation between the outer rebound characteristics and the internal diaphragm state is established, providing a stable foundation for the transformation and amplification of subsequent displacement signals.

[0033] S4, according to the boundary position of the diaphragm offset, a micro-volume bypass cavity is added outside the main oil way valve group, the diaphragm offset signal is converted into a controllable pressure difference, a pressure difference translation chain is constructed, and a double valve phase traction window is formed; In order to realize the external signal translation and response driving control of the diaphragm offset behavior, the diaphragm displacement limit represented by the thin layer rebound deformation needs to be converted into a controllable pressure difference signal, and a phase control path of double valve linkage traction is realized through structure design. The specific steps are as follows: According to the determined maximum displacement boundary of the diaphragm rebound, a response conversion channel is constructed at the axially extended position outside the sensor diaphragm structure, and a micro-volume cavity is set at the end of the channel. The cavity is fixed by welding the stainless steel thin-wall structure with the outer wall of the main oil way valve group, and the effective volume of the cavity is controlled between 0.4ml and 0.8ml. The cavity wall thickness is not more than 0.3mm, and a flexible inlet with an aperture of about 0.6mm is opened for receiving the small displacement displacement caused by the diaphragm deformation. When the diaphragm is offset by impact, the outer cover layer rebounds and drives the outer structure to pressurize the micro-volume cavity, thereby forming a continuously changing pressure disturbance. By using a stress conducting medium (such as a filled inert gas mixture) with linear response characteristics, the micro-disturbance is equivalent to a micro-pressure signal, and the average change amplitude of the signal is between 0.4kPa and 2.7kPa, which is sufficient to drive the downstream structure to respond stably.

[0034] The micro-pressure disturbance is guided into the flexible closed channel through the slit connection hole on the other side of the cavity. The length of the channel is controlled to be about 30mm, and the inside is filled with a flexible elastic medium with low rebound modulus to slow down the pressure conduction speed and realize the time separation expansion of the pressure difference signal. A pair of micro diaphragm valves with the same structure but opposite arrangement direction are arranged at the end of the channel path, corresponding to the upstream and downstream drainage branches of the main oil way respectively. The pair of diaphragm valves remain closed in the initial state, and only when the pressure difference signal in the channel exceeds the set threshold (for example, 1.2kPa) and the duration exceeds 20ms, the diaphragm valves are gradually opened, thereby adjusting the local flow rate rhythm of the two ends of the main oil way. The structure realizes the pressure difference amplification and positioning control of the diaphragm offset, so that the small movement of the diaphragm is equivalent to the phase difference control signal between the two valve bodies.

[0035] To ensure the stability of the phase traction effect, a flow limiting adjustment component is introduced between the aforementioned double diaphragm valves. The component adopts a micro-compressible pipe combination structure, the minimum inner diameter of which is controlled to be less than 0.3mm, and the wall thickness is less than 50μm. The two ends of the adjustment component are connected with the double diaphragm valves respectively, forming a continuous closed flow path. When the micro-pressure disturbance triggers the diaphragm valve to open through the flexible channel, the flow limiting structure applies shear resistance to the passing fluid through the deformable cavity, thereby guiding the double valve to deviate from the main oil way rhythm in a specific time sequence, forming a structural out-of-phase response state. In a synchronous control experiment on the opening and closing rhythm of the valve group with a frequency of 15Hz, the flow limiting structure successfully adjusts the response time of the double valve to lag behind the main rhythm by 9.8ms, so that the response phase of the downstream valve body lags behind the upstream valve body by 1.7 times, forming a controllable spatial out-of-phase distribution.

[0036] On the basis of the structure of the phase state, the response time difference of the double valve is added to the main oil way valve group control strategy, and a phase traction window with physical offset source is constructed. The window is driven by the pressure difference signal caused by the displacement of the diaphragm each time, and the dynamic tracking type rhythm control area is formed. In the process of multiple cycle response, the phase traction window shows good predictability and repeatability, and the width range of its time dimension is adjustable, usually controlled between 15 to 35 milliseconds; the space response displacement is controllable, and the maximum value can reach 2.3 millimeters. Through the structure, the opening and closing behavior of the main oil way valve group is no longer directly determined by the unified driving command, but indirectly pulled by the pressure difference signal formed by the diaphragm displacement, realizing the flexible following control of the fluid rhythm, so as to build a stable response chain in the running environment with frequent dynamic disturbance, and provide high consistency input basis for the final pressure relief control mechanism.

[0037] S5, according to the timing output results of the double valve phase traction window, the driving control of the valve group is implemented with the rhythm of the valve group, and the reversible micro spray relief device is triggered, so as to implement pressure relief at the moment before the impact peak arrives, weaken the amplitude of the reverse wave, realize closed loop control, and maintain the stability of the flow field of the main oil way and ensure the accuracy of the monitoring signal; In order to realize the rapid response control of the main oil way before the impact, it is necessary to link the rhythm of the main oil way valve group according to the output characteristics of the double valve phase traction window constructed in the previous structure, form phase staggered driving, and build dynamic closed loop control path through instantaneous pressure relief means, so as to stabilize the flow field and ensure the signal accuracy. The specific steps are as follows: Based on the timing data output by the double valve response path, the actual response delay time difference of the upstream and downstream valve bodies in each cycle is extracted. The time difference is used as the rhythm traction input parameter to construct the target staggered driving curve of the main oil way valve group. In order to realize the structure action corresponding to the target curve, adjustable flexible sliding mechanism is introduced in the main valve group driving mechanism, which is composed of asymmetric deformation sheet with bidirectional elastic recovery characteristics, and cooperates with magnetic control damper to control the action time accurately. For example, when the upstream valve response lag time is 11 milliseconds and the downstream valve advance time is 7 milliseconds, the deformation sheet adjusts its elastic recovery path to make the main valve action window lag the target rhythm by 9.3 milliseconds, and keeps the error not higher than ± 1 millisecond, so as to ensure that the whole valve group presents controllable staggered state in the original opening and closing cycle.

[0038] After the establishment of the out-of-phase drive structure, the pressure relief preparation time window is set according to the expected arrival time of the main peak of the anti-phase impact fingerprint, and the trigger response node is pre-set before the window in combination with the double valve traction rhythm. A reversible micro-jet relief device is added at the corresponding position downstream of the main oil way valve body, which is composed of an elastic sealing cavity, a micro-jet channel and a reset execution structure. The cavity is in a closed state in the initial state, and is filled with high-damping liquid silicone. The channel diameter is controlled below 0.2mm to form a high flow limiting effect. When the device receives the traction node signal mentioned above, the elastic sealing sheet is triggered by the drive control structure to release and form a jet path. The liquid is quickly released outward through the channel to form a local pressure drop area, which is used to offset the positive phase part of the shock wave that is about to arrive. In a typical response test, the relief device only needs 3.8 milliseconds from receiving the signal to completing the initial jet, which is much lower than the average time of 11.2 milliseconds of the main peak front of the shock wave, and has sufficient response margin.

[0039] Considering the persistence and energy tail effect of the shock wave, after the completion of the micro-jet relief, the nozzle is recovered and closed through the reset execution structure, and the initial state of the cavity is recovered synchronously, preparing for the next round of trigger conditions. The reset mechanism uses a micro-sized shape memory alloy spring combined with a heat-sensitive trigger sheet to achieve rapid contraction. When the liquid jet is finished, the spring is reset by the pressure drop in the channel to complete the sealing operation. Experimental data shows that this type of structure can still maintain a fatigue-free action life of more than 100,000 times after repeated triggering, ensuring its long-term stable operation in a high-frequency on-off environment. The transient pressure drop value formed by each jet is between 1.7kPa and 3.1kPa, which is enough to offset the main flow shock energy caused by the opening and closing of the main valve group, and to weaken the average wave amplitude by more than 38% at the main peak of the shock wave, greatly reducing the influence of shear interference on flow velocity and pressure acquisition signals.

[0040] After the completion of the micro-jet relief process, the out-of-phase drive control maintained by the double valve phase traction window is combined to close the closed loop. The whole structure automatically follows the pressure difference signal triggered by the diaphragm displacement in each cycle, and sequentially completes the out-of-phase drive of the main valve, the pre-triggering of pressure relief, the transient jet relief and the automatic reset of the structure, forming a continuous response capability. In a number of experiments, when the valve group action frequency is maintained at a high frequency level of more than 24 times per minute, the standard deviation of the flow velocity signal fluctuation amplitude decreases by 41%, the high-frequency abnormal pulse in the pressure signal decreases by more than 60%, and the signal linear fitting error decreases to 0.36 times of the original, effectively realizing the synchronous improvement of flow field stability and monitoring accuracy. The closed loop control path is dominated by response timing, the structure is the medium, and the shock energy dissipation is the goal, which builds a highly coordinated flow control chain and provides technical support for the equipment to realize predictive maintenance in complex working conditions.

[0041] The application forms an active pressure relief by constructing a flow rate pressure stripe extraction shear rhythm, generating an inverted impact fingerprint, constructing a diaphragm buffer limit, transforming a pressure difference signal and driving a double valve out-of-phase response, and then linking a micro spray device to realize an active pressure relief, and finally forms an impact release and flow field stability mechanism with rapid response and closed loop coordination. Compared with the traditional monitoring method, the scheme significantly improves the accuracy and robustness of the lubricating liquid monitoring data under high frequency dynamic operation conditions, reduces the oil film judgment error rate caused by signal deviation, effectively supports the intelligent research and judgment of the equipment health status and the stable execution of the predictive maintenance strategy, thereby prolongs the service life of the equipment while ensuring the operation safety.

[0042] The application provides a lubricating liquid online monitoring system based on a main line multi-parameter sensor, as shown in the formula Figure 2 The system comprises a shear disturbance sensing module, an impact feature extraction module, a diaphragm buffer protection module, a deviation pressure difference translation module and a dynamic flow field regulation module. The shear disturbance sensing module is provided with a micro pressure sampling hole and an optical fiber strain band on the upstream and downstream of a main oil way valve group to obtain continuous flow rate signals and continuous pressure signals, interweaves the flow rate signals and the pressure signals to form a flow rate pressure stripe, extracts the rhythm change of shear disturbance, and generates a shear resonance indication band. The impact feature extraction module analyzes the alternating positions of the reverse wave peaks of the flow rate and the pressure in the shear resonance indication band, identifies the starting point and the ending point of phase inversion, extracts a pulse envelope, generates an inverted impact fingerprint, and is used for calibrating the deviation features of the sensor diaphragm. The diaphragm buffer protection module is provided with a detachable thin layer on the outside of the sensor sensitive diaphragm to form a controlled buffer area of the impact energy corresponding to the inverted impact fingerprint on the diaphragm surface, and the boundary position of the diaphragm deviation is determined by the rebound deformation of the thin layer. The deviation pressure difference translation module adds a micro volume bypass cavity outside the main oil way valve group according to the boundary position of the diaphragm deviation to convert the diaphragm deviation signal into a controllable pressure difference, constructs a pressure difference translation chain, forms a double valve phase traction window, and extracts the rhythm change of shear disturbance. The dynamic flow field regulation module implements a driving control in a staggered position with the valve group opening and closing rhythm according to the time sequence output result of the double valve phase traction window, simultaneously triggers a reversible micro spray relief device, implements pressure relief at the moment before the impact peak arrives, weakens the amplitude of the reverse wave, realizes closed loop regulation, and thus maintains the flow field stability of the main oil way and guarantees the accuracy of the monitoring signal.

[0043] The lubricating liquid online monitoring method based on the main line multi-parameter sensor is realized by the lubricating liquid online monitoring system based on the main line multi-parameter sensor, and the specific method and process of the lubricating liquid online monitoring system based on the main line multi-parameter sensor are described in the embodiments of the lubricating liquid online monitoring method based on the main line multi-parameter sensor, which will not be repeated here.

[0044] Certain exemplary embodiments of the present application have been described above by way of illustration, and it is to be understood that equivalent alterations and modifications will occur to those skilled in the art in view of the foregoing without departing from the spirit and scope of the present application. Therefore, it is the intent that each element of the specification be incorporated by reference and that reference to a document filed prior to the priority date of this application be permitted, even though an item can not have been specifically referenced in the above description. In regard to the processes, methods, and / or algorithms disclosed, those skilled in the art will recognize that the functions required to be performed can be carried out by a variety of hardware and / or software means. Certain portions of the detailed description have been presented in terms of algorithms and symbolic representations of operations on data bits within a computer memory. These algorithmic descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the

Claims

1. A method for on-line monitoring of lubricating fluid based on a main road multi-parameter sensor, characterized in that, The method comprises the following steps: S1, respectively attaching optical fiber strain bands upstream and downstream of the main oil way valve group and setting micro pressure sampling holes to obtain continuous flow rate signals and continuous pressure signals, interleaving the flow rate signals and the pressure signals to form flow rate pressure stripes, extracting rhythm changes of shear disturbance, and generating a shear resonance indication band; S2, analyzing the reverse wave peak alternating positions of the flow rate and pressure in the shear resonance indication band, identifying the starting point and the ending point of phase inversion, extracting the pulse envelope, and generating a reverse impact fingerprint for calibrating the offset characteristics of the sensor diaphragm; S3, superimposing an unloadable thin layer coating on the outside of the sensor sensitive diaphragm to form a controlled buffer area of impact energy corresponding to the reverse impact fingerprint on the diaphragm surface, and determining the boundary position of diaphragm offset through the rebound deformation variable of the thin layer; S4, according to the boundary position of the diaphragm offset, adding a micro-volume bypass cavity outside the main oil way valve group to convert the diaphragm offset signal into a controllable pressure difference, constructing a pressure difference translation chain, forming a double-valve phase traction window; S5, according to the time sequence output result of the double-valve phase traction window, implementing driving control staggered with the opening and closing rhythm of the valve group, and simultaneously triggering a reversible micro-bleed device to implement pressure relief instantaneously before the impact peak arrives, weaken the amplitude of the reverse wave, realize closed-loop control, and thus maintain the flow field stability of the main oil way and ensure the accuracy of the monitoring signal.

2. The on-line monitoring method of lubricating fluid based on the master circuit multi-parameter sensor according to claim 1, characterized in that, Step S1 comprises: Performing structure pretreatment before and after the main oil way valve group, scratching micro grooves on the outer wall of the oil pipe through laser surface etching, and attaching optical fiber strain bands; Setting micro pressure sampling holes downstream of the valve group to obtain flow rate signals and pressure signals; time delay correction is performed on the flow rate signals and the pressure signals, and the flow rate signals and the pressure signals are interleaved to form flow rate pressure stripes; Performing frequency scanning identification based on the stripe sequence, extracting stripe segments with prominent phase changes and marking disturbance significant intervals; Mapping the disturbance significant intervals back to the main oil way to generate a shear resonance indication band.

3. The on-line monitoring method of lubricating fluid based on the master circuit multi-parameter sensor according to claim 2, characterized in that, Step S2 comprises: Extracting flow rate signal and pressure signal stripe sequences based on the shear resonance indication band, and constructing a reverse wave peak alternating sequence; Tracking the time interval changes of the reverse wave peak combination, identifying the starting point and the ending point of phase inversion; Extracting fluctuation differences and direction changes around the phase inversion section to pull out the pulse envelope curve; According to the pulse envelope, impact feature coordinates are extracted and matched to generate a reverse impact fingerprint.

4. The on-line monitoring method of lubricating fluid based on the master circuit multi-parameter sensor according to claim 3, characterized in that, The impact feature coordinates include the main peak position, the main peak amplitude, the main peak width and the difference in bilateral symmetry in the phase inversion interval, which are used to improve the accuracy of impact behavior identification.

5. The method according to claim 3, wherein Step S3 comprises: A constant-speed blade coating process is used to apply an unloadable elastic thin layer coating material to the outside of the sensor sensitive diaphragm to form a buffer contact layer covering the vibration area; After the coating is completed, a physical loading experiment is performed by using a vibration exciter and the rebound amount change is recorded to establish a mapping relationship between the rebound deformation variable and the impact energy; The transient rebound deformation variables at different positions are measured, the effective displacement path is calculated in combination with the diaphragm boundary response, and a displacement boundary map is constructed; The displacement boundary map is corresponded to the main peak position of the impact fingerprint to complete the bidirectional mapping of the outer rebound feature and the diaphragm structure response.

6. The on-line monitoring method of lubricating fluid based on the master circuit multi-parameter sensor according to claim 5, characterized in that, The displacement boundary map is used to identify the critical point of the diaphragm entering the nonlinear deformation stage in advance by forming the rebound deformation evolution trend map of the maximum displacement and the rebound growth rate of the thin layer recorded in the multiple start-stop shock loading experiments.

7. The method according to claim 5, wherein Step S4 comprises: A micro-volume cavity is arranged outside the sensor diaphragm structure to receive the displacement amount caused by the diaphragm deflection and is converted into a continuous pressure disturbance; The pressure disturbance is guided into the flexible closed channel to form a pressure difference signal, and the micro diaphragm valves arranged at the end of the channel are driven to open successively; A compressible pipe combination structure is arranged between the double diaphragm valves to form a flow limiting path to realize the time offset of the double valve response; According to the response time difference of the double valve, a phase traction window is generated to realize the flexible following control of the opening and closing rhythm of the main oil way valve group.

8. The method according to claim 7, wherein The flow limiting path is composed of a deformable cavity with a minimum inner diameter smaller than the valve port diameter of the micro diaphragm valve, which is used to apply shear resistance during the conduction of the micro pressure disturbance to realize the phase offset control of the double valve response.

9. The on-line monitoring method of lubricating fluid based on the main path multi-parameter sensor according to claim 7, characterized in that, Step S5 comprises: Based on the response path of the double valve, the response time difference is extracted, the out-of-phase driving curve is constructed, and the opening and closing rhythm of the main valve is adjusted through the deformation sheet structure; A reversible micro-jet relief device is added downstream and combined with the shock early warning node to trigger the elastic sealing sheet to release, forming a local pressure drop to offset the shock energy; The nozzle closure and cavity reset are realized through the shape memory alloy spring; Combined with the out-of-phase state maintained by the double valve rhythm, the continuous closed loop process of the main valve driving, pressure relief triggering, jet pressure relief and structure reset is completed.

10. The lubricating fluid on-line monitoring system based on the main line multi-parameter sensor, used to realize the lubricating fluid on-line monitoring method based on the main line multi-parameter sensor in any one of claims 1-9, characterized in that, It includes a shear disturbance sensing module, a shock feature extraction module, a diaphragm buffer protection module, an offset pressure difference translation module, and a dynamic flow field regulation module: The shear disturbance sensing module is attached with a fiber optic strain band and a micro pressure sampling hole upstream and downstream of the main oil way valve group, respectively, to obtain continuous flow rate signals and continuous pressure signals, interleave the flow rate signals and the pressure signals to form flow rate pressure stripes, extract the rhythm change of the shear disturbance, and generate a shear resonance indication band; The shock feature extraction module analyzes the reverse wave peak alternating position of the flow rate and pressure in the shear resonance indication band, identifies the starting point and ending point of the phase inversion, extracts the pulse envelope, and generates a reverse shock fingerprint for calibrating the offset characteristics of the sensor diaphragm; The diaphragm buffer protection module adds a detachable thin layer coating outside the sensor sensitive diaphragm, forms a controlled buffer area on the diaphragm surface corresponding to the reverse shock fingerprint, and determines the boundary position of the diaphragm offset through the rebound deformation amount of the thin layer; The offset pressure difference translation module adds a micro-volume bypass cavity outside the main oil way valve group according to the boundary position of the diaphragm offset, converts the diaphragm offset signal into a controllable pressure difference, constructs a pressure difference translation chain, and forms a double valve phase traction window; The dynamic flow field regulation module implements the driving control that is out of phase with the valve group opening and closing rhythm according to the time sequence output result of the double valve phase traction window, simultaneously triggers the reversible micro-jet relief device, and implements pressure relief instantaneously before the shock peak arrives, weakens the amplitude of the reverse wave, realizes closed loop regulation, and thus maintains the flow field stability of the main oil way and ensures the accuracy of the monitoring signal.

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