A health monitoring system for a viscous damper

Abstract

The present application relates to the technical field of viscous damper, and discloses a health monitoring system of viscous damper, wherein a data analysis module acquires time history data, displacement time history data and temperature field distribution data of the viscous damper, and calculates a reference damping characteristic index; an index determination module obtains a current damping force index according to a highest temperature value and a temperature gradient integral value; an index determination module reconstructs a damping force time history data curve and a piston rod displacement time history data curve, calculates a ratio of an actual annular area to a theoretical standard annular area, and obtains a hysteresis fullness index; a sealing analysis module monitors mass flow and cylinder inner cavity temperature field, and calculates sealing health degree; a health monitoring module calculates a comprehensive health score according to the current damping force index, the hysteresis fullness index and the sealing health degree, determines a health state grade, and realizes accurate monitoring and grading of the health state of the viscous damper through multi-source data such as damping force, displacement, temperature field and pressure, so as to improve safety and maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of viscous damper technology, and more specifically, to a health monitoring system for viscous dampers. Background Technology

[0002] Viscous dampers are devices that dissipate vibration energy by utilizing the shear resistance generated by viscous fluid during the reciprocating motion of a piston. They are widely used in seismic resistance and vibration reduction in building structures and bridge engineering, reducing earthquake or wind-induced vibration response by converting the kinetic energy of structural vibration into thermal energy.

[0003] Current health monitoring technologies for viscous dampers primarily rely on periodic manual inspections and simple visual checks. The condition of the damper is assessed by visually observing whether there is oil leakage at the seals and manually measuring whether the piston rod is stuck. However, existing technologies struggle to monitor the thermal aging and viscosity changes of the silicone oil within the cylinder cavity, making it impossible to quantitatively assess the progressive degradation of damping force performance. Furthermore, the detection of a single indicator cannot reflect the integrity of hysteresis energy dissipation characteristics and the overall health status of the sealing system, and the lack of real-time assessment of the frequency matching of the structure-damper system leads to the failure to detect potential failure risks in a timely manner. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a health monitoring system for viscous dampers. By collecting multi-source data such as damping force, displacement, temperature field, and pressure, a comprehensive evaluation method is constructed that covers baseline damping characteristics, fluid thermal aging correction, hysteresis fullness, and sealing health. This enables accurate monitoring and grading of the health status of viscous dampers, thereby improving safety and maintenance efficiency.

[0005] To achieve the above objectives, the present invention provides a health monitoring system for a viscous damper, comprising:

[0006] The data analysis module is used to acquire the damping force time history data, piston rod displacement time history data, cylinder internal cavity temperature field distribution data, and reciprocating motion number data of the viscous damper within a preset monitoring period, and to calculate the reference damping characteristic index of the viscous damper. The index determination module is used to obtain the current damping force index based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data. The index determination module is used to reconstruct the hysteresis curves of the damping force time history data and the piston rod displacement time history data, calculate the ratio of the actual circumferential area of ​​the reconstructed hysteresis curve to the theoretical standard circumferential area, and the offset of the geometric center of the curve, and fuse them to obtain the hysteresis fullness index. The sealing analysis module is used to monitor the mass flow rate of the leaking medium on the outer surface of the viscous damper and the temperature rise gradient of the internal cavity temperature field of the cylinder relative to the ambient temperature, and to calculate the sealing health. The health monitoring module is used to calculate a comprehensive health score by weighted fusion of the current damping force index, hysteresis fullness index and sealing health, and compare the comprehensive health score with the preset normal operation threshold and failure warning threshold to determine the health status level of the viscous damper.

[0007] Furthermore, the data analysis module is specifically used for: Determine the average value of the maximum tensile damping force and the maximum compressive damping force in the damping force time history data, and use the ratio of the average value to the rated design damping force as the force retention rate; Determine the slope of force change between adjacent peak values ​​in the piston rod displacement time history data, and use the ratio of the force change slope to the design stiffness as the stiffness compliance rate; The energy consumption value of a single cycle is obtained by determining the integral value of the product of damping force and displacement in a single reciprocating cycle, and the ratio of the single energy consumption value to the theoretical maximum energy consumption value is taken as the energy consumption ratio. The benchmark damping characteristic index is obtained by weighted summation of the force retention rate, stiffness compliance rate and energy dissipation ratio.

[0008] Furthermore, the index determination module is specifically used for: Based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data, the fluid thermal aging coefficient is calculated. The reference damping characteristic index is corrected based on the fluid thermal aging coefficient to obtain the current damping force index.

[0009] Furthermore, the index determination module is specifically used for: The cumulative duration for which the highest temperature value in the cylinder cavity temperature field distribution data exceeds the fluid's limiting operating temperature is determined, and the thermal aging duration component is obtained by multiplying the cumulative duration using a preset temperature acceleration coefficient. Determine the degree of deviation between the integral value of the temperature gradient and the standard heat dissipation gradient value, and use a preset heat dissipation degradation coefficient to multiply the degree of deviation to obtain the thermal gradient component. The mechanical heat accumulation component is obtained by multiplying the number of reciprocating motions with the preset single-motion shear heat equivalent. The fluid thermal aging coefficient is obtained by adding the thermal aging time component, the thermal gradient component, and the mechanical heat accumulation component.

[0010] Furthermore, the index determination module is specifically used for: The damping force attenuation is obtained by multiplying the fluid thermal aging coefficient with the preset aging sensitivity coefficient. A preliminary correction index is obtained by determining the difference between the benchmark damping characteristic index and the damping force attenuation. The deviation between the average temperature value of the cylinder internal cavity temperature field distribution data and the design operating temperature is determined, and the temperature compensation amount is obtained by multiplying the deviation value using a preset temperature compensation coefficient. The current damping force index is obtained by adding the initial correction index to the temperature compensation amount.

[0011] Furthermore, the indicator determination module is specifically used for: Plot the actual hysteresis curve with the piston rod displacement time history data as the horizontal axis and the damping force time history data as the vertical axis, and calculate the area enclosed by the actual hysteresis curve to obtain the actual circumferential area; The theoretical standard hysteresis loop area is calculated based on the maximum tensile damping force, the maximum compressive damping force, and the maximum piston rod displacement. The area saturation rate is obtained by determining the ratio of the actual circumferential area to the theoretical standard hysteresis loop area. Determine the offset distance between the geometric center of the actual hysteresis curve and the design origin in the vertical direction, and then perform inverse normalization on the ratio of the offset distance to the rated design damping force to obtain the symmetric deviation rate. The hysteresis fullness index is obtained by weighted fusion of the area fullness rate and the symmetry deviation rate.

[0012] Furthermore, the sealing analysis module is specifically used for: The leakage mass flow rate is obtained by determining the mass of silicone oil seeping from the seal of the viscous damper per unit time. The leakage deterioration factor is obtained by normalizing the ratio of the leakage mass flow rate to the reference leakage flow rate under the initial sealing state. The difference between the average temperature of the cylinder cavity and the ambient temperature is used to obtain the absolute temperature rise value. The ratio of the absolute temperature rise value to the standard temperature rise limit is used as the heat load factor. The sealing pressure factor is obtained by determining the deviation of the internal pressure drop rate of the viscous damper under pressure holding condition from the standard pressure holding rate. The seal health is obtained based on the leakage deterioration factor, heat load factor, and sealing pressure factor.

[0013] Furthermore, the health monitoring module is specifically used for: The damping performance component is obtained by multiplying the current damping force index with the preset damping weight coefficient. The energy consumption performance component is obtained by multiplying the hysteresis fullness index with the preset energy consumption weight coefficient. The sealing performance component is obtained by multiplying the sealing health degree by the preset sealing weight coefficient. The damping performance component, energy dissipation performance component, and sealing performance component are weighted and fused to obtain a comprehensive health score.

[0014] Furthermore, the health monitoring module is specifically used for: The state when the comprehensive health score is greater than the normal working threshold is defined as the normal service level; When the overall health score is determined to be less than or equal to the normal working threshold and greater than the failure warning threshold, the state is defined as the performance degradation level, triggering a preventive maintenance prompt; When the overall health score is determined to be less than or equal to the failure warning threshold, the state is defined as the failure risk level, triggering an emergency replacement alarm.

[0015] Furthermore, it also includes: The report upload module is used to generate a health monitoring report based on the health status level and upload the key parameters in the report to the structural health monitoring database to guide the maintenance decisions of the viscous damper.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention discloses a health monitoring system for a viscous damper. A data analysis module acquires time-history data, displacement time-history data, and temperature field distribution data of the viscous damper, and calculates a baseline damping characteristic index. An index determination module obtains the current damping force index based on the highest temperature value and the integral value of the temperature gradient. An index determination module reconstructs the damping force time-history data and piston rod displacement time-history data curves, calculates the ratio of the actual circumferential area to the theoretical standard circumferential area, and obtains the hysteresis fullness index. A sealing analysis module monitors the mass flow rate and the temperature field inside the cylinder cavity, and calculates the sealing health. A health monitoring module calculates a comprehensive health score based on the current damping force index, hysteresis fullness index, and sealing health, and determines the health status level. By collecting multi-source data such as damping force, displacement, temperature field, and pressure, the system achieves accurate monitoring and classification of the health status of the viscous damper, improving safety and maintenance efficiency. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of a health monitoring system for a viscous damper according to an embodiment of the present invention is shown. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0019] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, an embodiment of the present invention discloses a health monitoring system for a viscous damper, comprising: The data analysis module is used to acquire the damping force time history data, piston rod displacement time history data, cylinder internal cavity temperature field distribution data, and reciprocating motion number data of the viscous damper within a preset monitoring period, and to calculate the reference damping characteristic index of the viscous damper. The index determination module is used to obtain the current damping force index based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data. The index determination module is used to reconstruct the hysteresis curves of the damping force time history data and the piston rod displacement time history data, calculate the ratio of the actual circumferential area of ​​the reconstructed hysteresis curve to the theoretical standard circumferential area, and the offset of the geometric center of the curve, and fuse them to obtain the hysteresis fullness index. The sealing analysis module is used to monitor the mass flow rate of the leaking medium on the outer surface of the viscous damper and the temperature rise gradient of the internal cavity temperature field of the cylinder relative to the ambient temperature, and to calculate the sealing health. The health monitoring module is used to calculate a comprehensive health score by weighted fusion of the current damping force index, hysteresis fullness index and sealing health, and compare the comprehensive health score with the preset normal operation threshold and failure warning threshold to determine the health status level of the viscous damper.

[0024] In some embodiments of this application, the data analysis module is specifically used for: Determine the average value of the maximum tensile damping force and the maximum compressive damping force in the damping force time history data, and use the ratio of the average value to the rated design damping force as the force retention rate; Determine the slope of force change between adjacent peak values ​​in the piston rod displacement time history data, and use the ratio of the force change slope to the design stiffness as the stiffness compliance rate; The energy consumption value of a single cycle is obtained by determining the integral value of the product of damping force and displacement in a single reciprocating cycle, and the ratio of the single energy consumption value to the theoretical maximum energy consumption value is taken as the energy consumption ratio. The benchmark damping characteristic index is obtained by weighted summation of the force retention rate, stiffness compliance rate and energy dissipation ratio.

[0025] In this embodiment, the preset monitoring cycle is set to 24 hours, meaning a complete data collection and health assessment is performed daily. Damping force time-history data is collected using a bidirectional force sensor installed between the piston rod and the cylinder, with a sampling frequency of 100Hz. Piston rod displacement time-history data is collected using a displacement sensor installed at the extended end of the piston rod, with an accuracy of 0.01mm. Cylinder internal cavity temperature field distribution data is measured using a network of temperature sensors arranged on the inner wall of the cylinder, located at the upper and lower parts of the front, middle, and rear ends of the cylinder. The number of reciprocating motions is counted using a Hall sensor installed on the piston rod guide sleeve, with each reciprocation counted as one motion. The maximum tensile damping force refers to the maximum resistance value generated when the damper is under tension in a complete reciprocating cycle; the maximum compressive damping force refers to the maximum resistance value generated when under compression; and the rated design damping force is the standard damping force value specified in the viscous damper design document, typically 200kN. The slope of the force change between adjacent peak values ​​refers to the average slope of the damping force change with displacement as the piston rod moves from one extreme position to the other. The design stiffness is the equivalent stiffness value determined during the design phase of the viscous damper, typically 50 kN / mm. The single-cycle energy dissipation value is obtained by numerically integrating the area enclosed by the damping force-displacement curve in a complete reciprocating cycle. The theoretical maximum energy dissipation value is the theoretical maximum value calculated based on the rated design damping force and the maximum stroke. The weighted summation is weighted as follows: force retention rate 40%, stiffness compliance rate 30%, and energy dissipation ratio 30%, i.e., the benchmark damping characteristic index = 0.4 × force retention rate + 0.3 × stiffness compliance rate + 0.3 × energy dissipation ratio.

[0026] The beneficial effects of the above technical solution are: through comprehensive evaluation of three dimensions—force retention rate, stiffness compliance rate, and energy dissipation ratio—it fully reflects the benchmark mechanical performance of the viscous damper, providing reliable basic data for subsequent thermal aging correction and health status assessment.

[0027] In some embodiments of this application, the index determination module is specifically used for: Based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data, the fluid thermal aging coefficient is calculated. The reference damping characteristic index is corrected based on the fluid thermal aging coefficient to obtain the current damping force index.

[0028] In some embodiments of this application, the index determination module is specifically used for: The cumulative duration for which the highest temperature value in the cylinder cavity temperature field distribution data exceeds the fluid's limiting operating temperature is determined, and the thermal aging duration component is obtained by multiplying the cumulative duration using a preset temperature acceleration coefficient. Determine the degree of deviation between the integral value of the temperature gradient and the standard heat dissipation gradient value, and use a preset heat dissipation degradation coefficient to multiply the degree of deviation to obtain the thermal gradient component. The mechanical heat accumulation component is obtained by multiplying the number of reciprocating motions with the preset single-motion shear heat equivalent. The fluid thermal aging coefficient is obtained by adding the thermal aging time component, the thermal gradient component, and the mechanical heat accumulation component.

[0029] In this embodiment, the fluid's limiting operating temperature is set to 80°C. The cumulative duration is obtained by summing the time the temperature exceeds 80°C within a 24-hour monitoring cycle, in hours. The preset temperature acceleration coefficient is set to 2.0 degrees Celsius. This coefficient is determined based on the Arrhenius equation and silicone oil thermal aging test data, representing the factor by which the aging rate accelerates for every 1°C increase in temperature above the limit. The temperature gradient integral value is obtained by volume-weighted integration of the absolute values ​​of the differences between the temperatures at each measuring point in the cylinder cavity temperature field and the average temperature, reflecting the degree of temperature non-uniformity. The standard heat dissipation gradient value is the baseline temperature gradient value under normal heat dissipation conditions determined during the damper design phase, typically 5°C. The deviation is calculated as (temperature gradient integral value - standard heat dissipation gradient value) / standard heat dissipation gradient value. The preset heat dissipation degradation coefficient is set to 0.15. This coefficient is determined based on heat conduction theory and engineering experience, representing the accelerating effect of poor heat dissipation on aging. The preset single-cycle shear heat equivalent is set to 0.001. This value represents the contribution of heat generated by fluid shear in each reciprocating motion to aging, and is determined by tests based on fluid viscosity and piston speed.

[0030] The beneficial effects of the above technical solution are: by decomposing the thermal aging time component, thermal gradient component, and mechanical heat accumulation component, the independent contribution and comprehensive influence of three factors—temperature exceeding the limit, poor heat dissipation, and mechanical shear—on fluid aging are quantified, thereby improving the accuracy and pertinence of thermal aging assessment.

[0031] In some embodiments of this application, the index determination module is specifically used for: The damping force attenuation is obtained by multiplying the fluid thermal aging coefficient with the preset aging sensitivity coefficient. A preliminary correction index is obtained by determining the difference between the benchmark damping characteristic index and the damping force attenuation. The deviation between the average temperature value of the cylinder internal cavity temperature field distribution data and the design operating temperature is determined, and the temperature compensation amount is obtained by multiplying the deviation value using a preset temperature compensation coefficient. The current damping force index is obtained by adding the initial correction index to the temperature compensation amount.

[0032] In this embodiment, the preset aging sensitivity coefficient is set to 0.05. This coefficient is determined based on the performance degradation test of the viscous damper and represents the proportion of damping force performance reduction caused by a unit thermal aging coefficient. The damping force attenuation is calculated as the fluid thermal aging coefficient × 0.05, reflecting the performance loss caused by thermal aging. The preliminary correction index is calculated as the benchmark damping characteristic index minus the damping force attenuation; if the result is negative, it is taken as 0. The design operating temperature is set to 40℃, which is the average temperature of the cylinder cavity under the optimal operating condition of the viscous damper; the deviation value is calculated as the average temperature value minus 40℃, in degrees Celsius. The preset temperature compensation coefficient is set to 0.005 per degree Celsius. This coefficient is determined based on the viscosity-temperature characteristic curve of silicone oil and represents the degree of influence of each degree Celsius temperature deviation from the design value on the damping force index; the temperature compensation is calculated as the deviation value × 0.005, with positive compensation when the actual temperature is higher than the design value and negative compensation when it is lower than the design value. The current damping force index is calculated from 0 to 1. The closer it is to 1, the better the actual damping force performance.

[0033] The beneficial effects of the above technical solution are: by introducing an aging sensitivity coefficient and a temperature compensation coefficient, dynamic correction of the reference damping characteristic index is achieved, which not only eliminates the performance degradation caused by thermal aging, but also compensates for the influence of temperature fluctuations on the damping force, so that the current damping force index can truly reflect the actual working state of the damper.

[0034] In some embodiments of this application, the index determination module is specifically used for: Plot the actual hysteresis curve with the piston rod displacement time history data as the horizontal axis and the damping force time history data as the vertical axis, and calculate the area enclosed by the actual hysteresis curve to obtain the actual circumferential area; The theoretical standard hysteresis loop area is calculated based on the maximum tensile damping force, the maximum compressive damping force, and the maximum piston rod displacement. The area saturation rate is obtained by determining the ratio of the actual circumferential area to the theoretical standard hysteresis loop area. Determine the offset distance between the geometric center of the actual hysteresis curve and the design origin in the vertical direction, and then perform inverse normalization on the ratio of the offset distance to the rated design damping force to obtain the symmetric deviation rate. The hysteresis fullness index is obtained by weighted fusion of the area fullness rate and the symmetry deviation rate.

[0035] In this embodiment, the actual hysteresis curve is a closed curve obtained by plotting the collected damping force time history data and the corresponding piston rod displacement time history data in a Cartesian coordinate system. The horizontal axis represents displacement (in mm), and the vertical axis represents damping force (in kN). The actual circumferential area is calculated using a numerical integration method, that is, the area enclosed by the hysteresis curve is summed. The theoretical standard hysteresis loop area is calculated as (maximum tensile damping force + maximum compressive damping force) × maximum piston rod displacement, where the maximum piston rod displacement refers to the total stroke of the piston rod from one extreme position to the other extreme position in one reciprocating cycle. The geometric center is obtained by calculating the centroid position of the hysteresis curve in the vertical axis direction (damping force axis), that is, the average value of the damping force values ​​at all points on the curve; the design origin is the coordinate (0, 0), representing the equilibrium position of zero displacement and zero damping force. The offset distance is the absolute difference between the vertical coordinate of the geometric center and the vertical coordinate (0) of the design origin; the symmetry deviation rate is calculated as 1 - |offset distance| / rated design damping force, and the closer this value is to 1, the better the curve symmetry. When weighted fusion, the area saturation rate accounts for 60% of the weight, and the symmetry deviation rate accounts for 40% of the weight. That is, the hysteresis saturation index = 0.6 × area saturation rate + 0.4 × symmetry deviation rate.

[0036] The beneficial effects of the above technical solution are: the fullness of energy dissipation is reflected by the area fullness ratio, and the balance between tensile and compressive properties is reflected by the symmetry deviation ratio. The hysteresis fullness index obtained by the combination of the two comprehensively characterizes the energy dissipation quality of the viscous damper, providing a key basis for evaluating its vibration reduction performance.

[0037] In some embodiments of this application, the sealing analysis module is specifically used for: The leakage mass flow rate is obtained by determining the mass of silicone oil seeping from the seal of the viscous damper per unit time. The leakage deterioration factor is obtained by normalizing the ratio of the leakage mass flow rate to the reference leakage flow rate under the initial sealing state. The difference between the average temperature of the cylinder cavity and the ambient temperature is used to obtain the absolute temperature rise value. The ratio of the absolute temperature rise value to the standard temperature rise limit is used as the heat load factor. The sealing pressure factor is obtained by determining the deviation of the internal pressure drop rate of the viscous damper under pressure holding condition from the standard pressure holding rate. The seal health is obtained based on the leakage deterioration factor, heat load factor, and sealing pressure factor.

[0038] In this embodiment, the leakage mass flow rate is measured by an oil collection device and electronic balance located below the seal on the outer surface of the viscous damper. The increase in silicone oil mass over 24 hours is divided by time, and the unit is g / h. The baseline leakage flow rate under initial sealing conditions is the allowable leakage of a new damper under standard test conditions, typically 0.1 g / h. The leakage degradation factor is calculated as leakage mass flow rate / 0.1; if the result is greater than 1, it is taken as 1. Ambient temperature is measured by an ambient temperature sensor placed near the damper; the standard temperature rise limit is set at 30°C, which is the maximum allowable temperature rise of the sealing system under normal operating conditions. The pressure drop rate test under pressure holding conditions involves monitoring the time required for the cylinder cavity pressure to drop from 10 MPa to 8 MPa while the piston rod is stationary, and calculating the pressure drop rate. The standard pressure holding rate is the upper limit of the pressure drop rate specified in the design, typically 0.05 MPa / min. The sealing pressure holding factor is calculated as actual pressure drop rate / 0.05; if the result is greater than 1, it is taken as 1. The baseline health constant is set to 1.0. The sealing health is calculated as 1.0 - (leakage degradation factor + heat load factor + sealing pressure factor) / 3. If the result is less than 0, it is taken as 0.

[0039] The beneficial effects of the above technical solution are: by monitoring three dimensions—leakage flow rate, temperature rise gradient, and pressure holding capacity—the integrity of the sealing system is comprehensively evaluated, the degree of seal deterioration is quantified, and the technical problem that traditional visual inspection cannot detect early failure of internal seals is solved.

[0040] In some embodiments of this application, the health monitoring module is specifically used for: The damping performance component is obtained by multiplying the current damping force index with the preset damping weight coefficient. The energy consumption performance component is obtained by multiplying the hysteresis fullness index with the preset energy consumption weight coefficient. The sealing performance component is obtained by multiplying the sealing health degree by the preset sealing weight coefficient. The damping performance component, energy dissipation performance component, and sealing performance component are weighted and fused to obtain a comprehensive health score.

[0041] In this embodiment, the preset damping weight coefficient is set to 0.4, which reflects the fundamental role of damping force performance in structural vibration reduction; the preset energy dissipation weight coefficient is set to 0.35, which reflects the importance of energy dissipation capacity in vibration control; and the preset sealing weight coefficient is set to 0.25, which reflects the role of sealing integrity in ensuring long-term reliability. The sum of the three weight coefficients is 1.0, which meets the weight normalization requirement.

[0042] The beneficial effects of the above technical solution are: through reasonable weight allocation, the organic integration of multi-dimensional health indicators is achieved, which not only highlights the core position of damping force and energy dissipation performance, but also takes into account the important influence of sealing integrity, so that the comprehensive health score can comprehensively and objectively reflect the true health status of the viscous damper.

[0043] In some embodiments of this application, the health monitoring module is specifically used for: The state when the comprehensive health score is greater than the normal working threshold is defined as the normal service level; When the overall health score is determined to be less than or equal to the normal working threshold and greater than the failure warning threshold, the state is defined as the performance degradation level, triggering a preventive maintenance prompt; When the overall health score is determined to be less than or equal to the failure warning threshold, the state is defined as the failure risk level, triggering an emergency replacement alarm.

[0044] In this embodiment, the normal operating threshold is set to 0.7, indicating that the damper is considered normal when its performance remains above 70% of the design level. The failure warning threshold is set to 0.4, which is determined based on structural seismic safety assessment standards and engineering practice experience. This threshold indicates that when the performance is below 40% of the design level, the damper may not be able to perform its expected damping effect under extreme loads, posing a risk of failure. The normal service level indicates that the viscous damper's performance indicators are good, requiring no special maintenance, only routine inspections. The performance degradation level indicates that the damper has experienced a certain degree of performance decline but can still function normally. In this case, the system automatically sends a preventative maintenance reminder to maintenance personnel, suggesting a detailed inspection and maintenance. The failure risk level indicates that the damper's performance has severely deteriorated or the seal has failed, potentially endangering structural safety. In this case, the system immediately triggers an emergency replacement alarm.

[0045] The beneficial effects of the above technical solution are: by setting clear threshold limits, automatic classification of health status is achieved, and by combining the classification response mechanism, differentiated maintenance strategies are realized. This avoids the waste of resources caused by over-maintenance and prevents safety hazards caused by untimely maintenance. At the same time, life prediction provides a time basis for spare parts procurement and maintenance planning.

[0046] In some embodiments of this application, it also includes: The report upload module is used to generate a health monitoring report based on the health status level and upload the key parameters in the report to the structural health monitoring database to guide the maintenance decisions of the viscous damper.

[0047] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although the invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The fact that not all of these combinations are described in this specification is merely for the sake of brevity and resource conservation.

[0049] It will be understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A health monitoring system for a viscous damper, characterized in that, include: The data analysis module is used to acquire the damping force time history data, piston rod displacement time history data, cylinder internal cavity temperature field distribution data, and reciprocating motion number data of the viscous damper within a preset monitoring period, and to calculate the reference damping characteristic index of the viscous damper. The index determination module is used to obtain the current damping force index based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data. The index determination module is used to reconstruct the hysteresis curves of the damping force time history data and the piston rod displacement time history data, calculate the ratio of the actual circumferential area of ​​the reconstructed hysteresis curve to the theoretical standard circumferential area, and the offset of the geometric center of the curve, and fuse them to obtain the hysteresis fullness index. The sealing analysis module is used to monitor the mass flow rate of the leaking medium on the outer surface of the viscous damper and the temperature rise gradient of the internal cavity temperature field of the cylinder relative to the ambient temperature, and to calculate the sealing health. The health monitoring module is used to calculate a comprehensive health score by weighted fusion of the current damping force index, hysteresis fullness index and sealing health, and compare the comprehensive health score with the preset normal operation threshold and failure warning threshold to determine the health status level of the viscous damper.

2. The health monitoring system for a viscous damper according to claim 1, characterized in that, The data analysis module is specifically used for: Determine the average value of the maximum tensile damping force and the maximum compressive damping force in the damping force time history data, and use the ratio of the average value to the rated design damping force as the force retention rate; Determine the slope of force change between adjacent peak values ​​in the piston rod displacement time history data, and use the ratio of the force change slope to the design stiffness as the stiffness compliance rate; The energy consumption value of a single cycle is obtained by determining the integral value of the product of damping force and displacement in a single reciprocating cycle, and the ratio of the single energy consumption value to the theoretical maximum energy consumption value is taken as the energy consumption ratio. The benchmark damping characteristic index is obtained by weighted summation of the force retention rate, stiffness compliance rate and energy dissipation ratio.

3. The health monitoring system for a viscous damper according to claim 1, characterized in that, The index determination module is specifically used for: Based on the highest temperature value and temperature gradient integral value in the cylinder internal cavity temperature field distribution data, combined with the reciprocating motion number data, the fluid thermal aging coefficient is calculated. The reference damping characteristic index is corrected based on the fluid thermal aging coefficient to obtain the current damping force index.

4. The health monitoring system for a viscous damper according to claim 3, characterized in that, The index determination module is specifically used for: The cumulative duration for which the highest temperature value in the cylinder cavity temperature field distribution data exceeds the fluid's limiting operating temperature is determined, and the thermal aging duration component is obtained by multiplying the cumulative duration using a preset temperature acceleration coefficient. Determine the degree of deviation between the integral value of the temperature gradient and the standard heat dissipation gradient value, and use a preset heat dissipation degradation coefficient to multiply the degree of deviation to obtain the thermal gradient component. The mechanical heat accumulation component is obtained by multiplying the number of reciprocating motions by the preset single-motion shear heat equivalent. The fluid thermal aging coefficient is obtained by adding the thermal aging time component, the thermal gradient component, and the mechanical heat accumulation component.

5. The health monitoring system for a viscous damper according to claim 3, characterized in that, The index determination module is specifically used for: The damping force attenuation is obtained by multiplying the fluid thermal aging coefficient with the preset aging sensitivity coefficient. A preliminary correction index is obtained by determining the difference between the reference damping characteristic index and the damping force attenuation. The deviation between the average temperature value of the cylinder internal cavity temperature field distribution data and the design operating temperature is determined, and the temperature compensation amount is obtained by multiplying the deviation value using a preset temperature compensation coefficient. The current damping force index is obtained by adding the initial correction index to the temperature compensation amount.

6. The health monitoring system for a viscous damper according to claim 1, characterized in that, The indicator determination module is specifically used for: Plot the actual hysteresis curve with the piston rod displacement time history data as the horizontal axis and the damping force time history data as the vertical axis, and calculate the area enclosed by the actual hysteresis curve to obtain the actual circumferential area; The theoretical standard hysteresis loop area is calculated based on the maximum tensile damping force, the maximum compressive damping force, and the maximum piston rod displacement. The area saturation rate is obtained by determining the ratio of the actual circumferential area to the theoretical standard hysteresis loop area. Determine the offset distance between the geometric center of the actual hysteresis curve and the design origin in the vertical direction, and then perform inverse normalization on the ratio of the offset distance to the rated design damping force to obtain the symmetric deviation rate. The hysteresis fullness index is obtained by weighted fusion of the area fullness rate and the symmetry deviation rate.

7. The health monitoring system for a viscous damper according to claim 1, characterized in that, The sealing analysis module is specifically used for: The leakage mass flow rate is obtained by determining the mass of silicone oil seeping from the seal of the viscous damper per unit time. The leakage deterioration factor is obtained by normalizing the ratio of the leakage mass flow rate to the reference leakage flow rate under the initial sealing state. The difference between the average temperature of the cylinder cavity and the ambient temperature is used to obtain the absolute temperature rise value. The ratio of the absolute temperature rise value to the standard temperature rise limit is used as the heat load factor. The sealing pressure factor is obtained by determining the deviation of the internal pressure drop rate of the viscous damper under pressure holding condition from the standard pressure holding rate. The seal health is obtained based on the leakage deterioration factor, heat load factor, and sealing pressure factor.

8. The health monitoring system for a viscous damper according to claim 1, characterized in that, The health monitoring module is specifically used for: The damping performance component is obtained by multiplying the current damping force index with the preset damping weight coefficient. The energy consumption performance component is obtained by multiplying the hysteresis fullness index with the preset energy consumption weight coefficient. The sealing performance component is obtained by multiplying the sealing health degree by the preset sealing weight coefficient. The damping performance component, energy dissipation performance component, and sealing performance component are weighted and fused to obtain a comprehensive health score.

9. The health monitoring system for a viscous damper according to claim 1, characterized in that, The health monitoring module is specifically used for: The state when the comprehensive health score is greater than the normal working threshold is defined as the normal service level; When the overall health score is determined to be less than or equal to the normal working threshold and greater than the failure warning threshold, the state is defined as the performance degradation level, triggering a preventive maintenance prompt; When the overall health score is determined to be less than or equal to the failure warning threshold, the state is defined as the failure risk level, triggering an emergency replacement alarm.

10. The health monitoring system for a viscous damper according to claim 1, characterized in that, Also includes: The report upload module is used to generate a health monitoring report based on the health status level and upload the key parameters in the report to the structural health monitoring database to guide the maintenance decisions of the viscous damper.

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