Adaptive control method for reducing vibration of marine backup power supply based on vibration transmission

Abstract

The application discloses a marine standby power source damping adaptive control method based on vibration transmission and relates to the technical field of damping control, and is used for solving the problems of local structure fatigue aggravation and damping efficiency reduction. Each structure node information is called through accessing a structure database, whether a vibration bypass effect is formed is analyzed based on a node vibration phase relationship, a node amplitude decay rate is detected, a vibration transmission path is constructed according to the amplitude decay rate, a path fastener slip amount is collected and an energy leakage index is calculated, vibration residence time is counted, an energy accumulation weight is generated in combination with the energy leakage index, a vibration energy accumulation area is identified, corresponding adjustment strategies are selected in combination with a function type identifier, redirection processing is performed on the vibration transmission path, then structure node vibration energy is monitored and a phase synchronization rate is calculated, a peripheral resonance trend is evaluated, a base damper response threshold is regulated according to the peripheral resonance trend, and the risk of local resonance and structure fatigue is reduced.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, and more specifically, to an adaptive vibration control method for offshore backup power supplies based on vibration transmission. Background Technology

[0002] Offshore backup power supplies are typically deployed on ship platforms and offshore wind power auxiliary platforms. Due to the long-term impact of wind and waves, periodic loads on equipment, changes in platform attitude, and the combined effects of multiple coupled equipment operation, backup power supplies are prone to complex structural vibration transmission phenomena during operation. In particular, under the combined action of multi-layer support structures, flexible connection structures, and composite mounting bases, vibration energy does not decay unidirectionally along a fixed path, but instead forms bypass propagation, local circulation, and energy retention phenomena between some structural nodes.

[0003] The existing technology has the following shortcomings:

[0004] Currently, under actual offshore operating conditions, the vibration transmission path between different structural regions within the offshore backup power supply continuously changes dynamically due to the micro-slippage of the connection parts. It is difficult to coordinate and control the bypass propagation trend, local residence state, and external synchronous resonance relationship of vibration energy in complex structures. This causes vibration energy to easily bypass the original vibration reduction area and accumulate continuously at key structural nodes, thereby leading to increased local structural fatigue and decreased vibration reduction efficiency. Therefore, an adaptive control method for vibration reduction of offshore backup power supply based on vibration transmission is proposed. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide an adaptive control method for vibration reduction of marine backup power supply based on vibration transmission. This method addresses the problems mentioned in the background art by employing structural node vibration phase correlation analysis, dynamic construction of vibration transmission paths, identification of energy accumulation areas, vibration path redirection and regulation, and adaptive damping linkage control technology for peripheral resonance trends.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adaptive control method for vibration reduction of offshore backup power supply based on vibration transmission, comprising the following steps:

[0007] Step S1: Access the structural database to retrieve the structural node information of the offshore backup power supply and perform phase analysis. Based on the phase analysis results, determine whether a vibration bypass effect has been formed. If a vibration bypass effect has been formed, detect the amplitude attenuation rate of each structural node.

[0008] Step S2: Construct vibration transmission paths based on amplitude attenuation rate, collect fastener slippage of each vibration transmission path and calculate energy dissipation index, count vibration residence time of vibration transmission paths, and generate energy accumulation weights by combining energy dissipation index;

[0009] Step S3: Identify the energy accumulation area based on the energy accumulation weight, obtain the functional type identifier of the energy accumulation area, and select different adjustment strategies to perform redirection processing on the vibration transmission path according to the functional type identifier;

[0010] Step S4: After performing the redirection process, monitor the vibration energy of each structural node and calculate the phase synchronization rate. Based on the phase synchronization rate, assess the external resonance trend of the offshore backup power supply and determine whether to adjust the response threshold of the base damper based on the external resonance trend.

[0011] In a preferred embodiment, in step S1, the structural database is accessed to retrieve the structural node information corresponding to the offshore backup power supply.

[0012] The structural node information includes diesel generator base nodes, fuel pipe flexible connection nodes, control cabinet installation nodes, cable tray suspension nodes, exhaust corrugated pipe support nodes, and container top support nodes;

[0013] The structural propagation links are generated according to the structural connection sequence of the structural nodes. The structural propagation links refer to the set of vibration propagation sequences generated based on the actual connection relationship between the structural nodes.

[0014] Vibration sensors installed at each structural node are used to collect the node vibration signals of the corresponding structural node. The node vibration signal is the vibration acceleration of the corresponding structural node at the current sampling time.

[0015] Frequency domain decomposition processing is performed on the nodal vibration signal to obtain the vibration amplitude and corresponding vibration phase of the structural node;

[0016] Calculate the absolute difference in vibration phase between any two adjacent structural nodes to obtain the node phase difference.

[0017] In a preferred embodiment, in step S1, the difference between the current node phase difference and the node phase difference in the previous sampling period is calculated in each sampling period to obtain the node phase difference change.

[0018] When the changes in the phase difference of nodes corresponding to consecutive adjacent sampling periods all maintain the same sign, it is determined that the changes in the phase difference of the corresponding nodes satisfy the condition of changing in the same direction.

[0019] The percentage of samples that meet the same-direction change condition within the sliding time window is obtained by dividing the number of samples within the sliding time window by the total number of sampling periods.

[0020] When the proportion of changes in the same direction exceeds the preset trend maintenance ratio threshold, it is determined that a vibration bypass effect has been formed; otherwise, it is determined that no vibration bypass effect has been formed.

[0021] After the vibration bypass effect is formed, the input vibration amplitude of the preceding structural node and the output vibration amplitude of the following structural node in the structural propagation link are obtained and subtracted. The result of the subtraction is divided by the input vibration amplitude of the preceding structural node to obtain the amplitude attenuation rate between the preceding and following structural nodes.

[0022] In a preferred embodiment, in step S2, adjacent structural nodes with amplitude attenuation rates lower than a preset attenuation threshold are identified as low-dissipation connection nodes, and multiple consecutive low-dissipation connection nodes are combined to generate corresponding vibration transmission paths, and the path attenuation retention coefficient of each vibration transmission path is calculated.

[0023] The displacement of the fastener under vibration is collected, and the displacement at the current sampling moment is subtracted from the displacement at the previous sampling moment to obtain the fastener slippage.

[0024] Access the structural database to retrieve the material stiffness of each structural connection location, and perform statistical processing on the slippage of all fasteners in each vibration transmission path to calculate the energy dissipation index;

[0025] The vibration amplitude of each structural node is continuously monitored, and a high amplitude judgment threshold is set for the node. When the vibration amplitude of the corresponding structural node is continuously higher than the high amplitude judgment threshold, it is determined that the vibration energy forms a stationary state at the structural node. The duration of the vibration energy forming a stationary state in each structural node is counted to obtain the vibration stationary time.

[0026] In a preferred embodiment, in step S2, the vibration dwell time of each structural node in the same vibration transmission path is accumulated to obtain the path dwell coefficient of the corresponding vibration transmission path.

[0027] The path dwell coefficient, path attenuation retention coefficient, and energy release index are standardized to obtain the path dwell factor, path attenuation retention factor, and energy release factor, respectively.

[0028] The energy accumulation weight is generated by combining the path dwell factor, path decay maintenance factor, and energy release factor. ;

[0029] in, For energy accumulation weight, This is the path decay preservation factor. For path dwell factor, As an energy release factor, To prevent extremely small constants with a denominator of zero.

[0030] In a preferred embodiment, in step S3, the energy accumulation weights are arranged in descending order, and the vibration transmission paths with the highest weights and the pre-defined cumulative proportions are marked.

[0031] After merging and deduplicating the corresponding structural nodes in the marked vibration transmission path, the node set of the energy accumulation region is obtained, and the node set of the energy accumulation region is taken as the energy accumulation region.

[0032] Access the structure database to obtain the function type identifier of the structure node corresponding to the energy accumulation area. The function type identifier is an enumerated attribute value that is pre-written into the structure database.

[0033] For structural nodes with different functional types, the corresponding adjustment strategy is selected to perform vibration transmission path redirection processing. The redirection processing includes damping adjustment, stiffness switching, and flexible connection redirection processing.

[0034] In a preferred embodiment, in step S3, the corresponding adjustment strategy is selected based on the structural nodes identified by different functional types to perform vibration transmission path redirection processing;

[0035] Specifically, damping adjustment is performed on base-type structural nodes, stiffness switching is performed on control cabinet or cable tray-type structural nodes, and flexible connection redirection is performed on pipeline or smoke exhaust structural nodes.

[0036] In a preferred embodiment, in step S4, after the redirection process is performed, the vibration energy of each structural node is monitored. The current vibration velocity is collected by the vibration sensor at each structural node, and the current vibration energy of each node is calculated by combining it with the equivalent mass of the corresponding structural node in the structural database.

[0037] Based on the vibration energy corresponding to each structural node, the phase synchronization state between each structural node is weighted and calculated to obtain the phase synchronization rate. When the absolute value of the phase difference between structural node pairs is less than the preset synchronization judgment threshold, the corresponding structural node pairs are determined to be in a synchronized state.

[0038] In a preferred embodiment, in step S4, when the phase synchronization rate is greater than the preset peripheral resonance trigger threshold, it is determined that the marine backup power supply has a peripheral resonance trend, and the response threshold of the base damper is adjusted.

[0039] Conversely, when the phase synchronization rate is less than the preset external resonance trigger threshold, it is determined that the marine backup power supply does not have an external resonance trend, and there is no need to adjust the response threshold of the base damper.

[0040] After determining that there is a tendency for external resonance, access the base damper configuration database to retrieve the response threshold of the base damper;

[0041] Control the response threshold of the base damper: ,in, For phase synchronization rate, The preset damping control sensitivity coefficient, The response threshold of the base damper. The response threshold after adjusting the base damper.

[0042] The technical effects and advantages of this invention are as follows:

[0043] This invention retrieves information about each structural node by accessing a structural database and analyzes whether a vibration bypass effect has formed based on the vibration phase relationship between the structural nodes. After identifying the vibration bypass, it detects the amplitude attenuation rate of each structural node, constructs a vibration transmission path based on the amplitude attenuation rate, collects the slippage of fasteners along each vibration transmission path and calculates the energy release index, and simultaneously counts the vibration dwell time. It then generates an energy accumulation weight based on the energy release index, identifies vibration energy accumulation areas based on the energy accumulation weight, and selects different adjustment strategies based on the corresponding functional type identifier. It performs damping adjustment, stiffness switching, and flexible connection redirection processing on the vibration transmission path. After completing the redirection processing, it continuously monitors the vibration energy of each structural node, calculates the phase synchronization rate, and evaluates the external resonance trend. Based on the external resonance trend, it adjusts the response threshold of the base damper, thereby achieving a global balanced distribution of vibration energy of the offshore backup power supply and reducing the risk of local resonance and structural fatigue. Attached Figure Description

[0044] Figure 1 This is a flowchart illustrating the implementation of the vibration reduction adaptive control method for offshore backup power supply based on vibration transmission, as described in this invention.

[0045] Figure 2 This is a schematic diagram illustrating the steps of the vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to the present invention. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] This invention retrieves information about each structural node by accessing a structural database and analyzes whether a vibration bypass effect has formed based on the vibration phase relationship between the structural nodes. After identifying the vibration bypass, it detects the amplitude attenuation rate of each structural node, constructs a vibration transmission path based on the amplitude attenuation rate, collects the slippage of fasteners in each vibration transmission path and calculates the energy release index, and simultaneously counts the vibration dwell time. It generates an energy accumulation weight based on the energy release index, identifies the vibration energy accumulation area based on the energy accumulation weight, and selects different adjustment strategies based on the corresponding functional type identifier. It performs damping adjustment, stiffness switching, and flexible connection redirection processing on the vibration transmission path. After completing the redirection processing, it continuously monitors the vibration energy of each structural node, calculates the phase synchronization rate and evaluates the external resonance trend. Based on the external resonance trend, it adjusts the response threshold of the base damper, thereby achieving a global balanced distribution of vibration energy of the marine backup power supply.

[0048] Example 1, as Figures 1 to 2 As shown, the vibration reduction adaptive control method for offshore backup power supply based on vibration transmission includes the following steps:

[0049] Step S1: Access the structural database to retrieve the structural node information of the offshore backup power supply and perform phase analysis. Based on the phase analysis results, determine whether a vibration bypass effect has been formed. If a vibration bypass effect has been formed, detect the amplitude attenuation rate of each structural node.

[0050] Step S2: Construct vibration transmission paths based on amplitude attenuation rate, collect fastener slippage of each vibration transmission path and calculate energy dissipation index, count vibration residence time of vibration transmission paths, and generate energy accumulation weights by combining energy dissipation index;

[0051] Step S3: Identify the energy accumulation area based on the energy accumulation weight, obtain the functional type identifier of the energy accumulation area, and select different adjustment strategies to perform redirection processing on the vibration transmission path according to the functional type identifier;

[0052] Step S4: After performing the redirection process, monitor the vibration energy of each structural node and calculate the phase synchronization rate. Based on the phase synchronization rate, assess the external resonance trend of the offshore backup power supply and determine whether to adjust the response threshold of the base damper based on the external resonance trend.

[0053] The specific implementation is as follows:

[0054] In step S1, the structural database is accessed to retrieve the structural node information of the offshore backup power supply and phase analysis is performed. Based on the phase analysis results, it is determined whether a vibration bypass effect has been formed. If a vibration bypass effect has been formed, the amplitude attenuation rate of each structural node is detected.

[0055] Specifically, the first step is to access the structural database and retrieve the structural node information corresponding to the offshore backup power supply. The structural node information represents the connection relationships between the various equipment structures within the offshore backup power supply, including diesel generator base nodes, fuel pipe flexible connection nodes, control cabinet installation nodes, cable tray suspension nodes, exhaust corrugated pipe support nodes, and container top support nodes.

[0056] Among them, the structural database refers to a set of structured data used to store the parameters, connection relationships and material properties of each structural component inside the offshore backup power supply.

[0057] Subsequently, structural propagation links are generated according to the structural connection sequence of the structural nodes. A structural propagation link is a set of vibration propagation sequences generated based on the actual connection relationship between structural nodes.

[0058] Vibration sensors installed at each structural node are used to collect the node vibration signals of the corresponding structural node. The node vibration signal is the vibration acceleration of the corresponding structural node at the current sampling time.

[0059] It should be noted that vibration sensors are detection devices installed at various structural nodes to collect the vibration status of the structural nodes.

[0060] Subsequently, frequency domain decomposition processing is performed on the node vibration signal. Specifically, a Fast Fourier Transform (FFT) is performed on the node vibration signal to obtain the spectral distribution of the node vibration signal at different frequencies. The frequency component with the largest amplitude is extracted from the spectral distribution as the principal vibration frequency of the structural node. The principal vibration frequency is used to characterize the frequency position where the current vibration energy of the corresponding structural node is most concentrated. The higher the value, the shorter the current vibration change period of the corresponding structural node; the lower the principal vibration frequency, the more susceptible the corresponding structural node is to the influence of low-frequency structural oscillations.

[0061] The vibration amplitude of the structural node is calculated based on the spectral amplitude corresponding to the main vibration frequency. The vibration amplitude is used to characterize the current vibration intensity of the corresponding structural node. The larger the value, the higher the vibration energy borne by the corresponding structural node.

[0062] Furthermore, the complex spectrum results at the corresponding principal vibration frequency are extracted, and the phase angle corresponding to the complex spectrum results is calculated to generate the vibration phase corresponding to the structural node.

[0063] Vibration phase is used to characterize the degree of deviation of the vibration waveform of the current structural node relative to a unified time base. The closer the vibration phases are, the stronger the synchronization of vibration propagation between different structural nodes; the greater the difference in vibration phases, the more significant the propagation delay or propagation path deviation during vibration propagation.

[0064] Based on the vibration phase, the node phase difference is calculated between any two adjacent structural nodes. Specifically, the absolute difference in the vibration phases of any two adjacent structural nodes is calculated to obtain the node phase difference. The node phase difference is used to characterize the degree of synchronization of vibration energy propagation between different structural nodes. The smaller the value, the more continuous the vibration energy propagates along the current structural path; the larger the node phase difference, the more likely there is vibration propagation lag or energy shift in the corresponding structural path.

[0065] Furthermore, continuous time-series analysis is performed on the node phase differences between each structural node, and the changing trend of the node phase differences is determined using a sliding time window. Specifically, assuming the current sliding time window contains several consecutive sampling periods, the difference between the current node phase difference and the node phase difference of the previous sampling period is calculated within each sampling period to obtain the change in node phase difference. The change in node phase difference is used to characterize the direction of change in the vibration synchronization relationship between the corresponding structural nodes. A value greater than zero indicates an increase in the node phase difference, suggesting a decrease in the degree of vibration synchronization between the corresponding structural nodes; a value less than zero indicates a decrease in the node phase difference, suggesting an increase in the degree of vibration synchronization between the corresponding structural nodes.

[0066] Subsequently, a statistical analysis was performed on the sign consistency of the phase difference changes of each node within consecutive sampling periods. Specifically, when the phase difference changes of nodes corresponding to consecutive adjacent sampling periods all maintained the same sign, the phase difference changes of the corresponding nodes were determined to satisfy the condition of changing in the same direction. Specifically, if the phase difference changes of nodes corresponding to multiple consecutive sampling periods were all greater than zero, it indicates that the node phase difference maintained an increasing trend within multiple consecutive sampling periods; if the phase difference changes of nodes corresponding to multiple consecutive sampling periods were all less than zero, it indicates that the node phase difference maintained a decreasing trend within multiple consecutive sampling periods.

[0067] Subsequently, the number of samplings satisfying the same-direction change condition within the sliding time window is counted and divided by the total number of sampling periods within the sliding time window to obtain the proportion of same-direction changes. The proportion of same-direction changes is used to characterize the consistency of the direction of change of the node phase difference; the larger the value, the more the vibration propagation relationship between the corresponding structural nodes changes in the same direction.

[0068] When the proportion of changes in the same direction exceeds the preset trend maintenance ratio threshold, it indicates that the direction of vibration energy propagation has deviated from the original structural connection direction and formed a cross-node propagation trend in other structural regions. At this time, it is determined that a vibration bypass effect has been formed.

[0069] Conversely, if the vibration bypass effect does not occur, it is determined that no vibration bypass effect is formed.

[0070] It should be noted that the trend retention ratio threshold is used to characterize the stability of the direction of change of node phase difference. For example, when the sliding time window length is set to 10 sampling periods and the trend retention ratio threshold is set to 0.8, it means that when the direction of change of node phase difference is consistent at least 8 times within 10 consecutive sampling periods, it is determined that the corresponding node phase difference has a continuous increasing or decreasing trend. In this embodiment, the vibration bypass effect specifically refers to the vibration imbalance state caused by the direction of vibration energy propagation deviating from the original structural connection direction, and does not refer to the physical bypass structure.

[0071] After the vibration bypass effect is established, amplitude attenuation rate detection processing is performed on each structural node. Specifically, the input vibration amplitude of the preceding structural node and the output vibration amplitude of the following structural node in the structural propagation link are obtained. The input vibration amplitude of the preceding structural node is subtracted from the output vibration amplitude of the following structural node, and then divided by the input vibration amplitude of the preceding structural node to obtain the amplitude attenuation rate between the preceding and following structural nodes. The amplitude attenuation rate is used to characterize the attenuation ability of vibration energy in the corresponding structural path. The larger the value, the stronger the ability of the corresponding structural path to dissipate vibration energy; the smaller the amplitude attenuation rate, the higher the propagation retention of vibration energy in the path, and the easier it is to form vibration energy accumulation.

[0072] In step S2, a vibration transmission path is constructed based on the amplitude attenuation rate. The slippage of fasteners in each vibration transmission path is collected and the energy release index is calculated. The vibration dwell time of the vibration transmission path is statistically analyzed, and the energy accumulation weight is generated by combining the energy release index.

[0073] The amplitude attenuation rate between each structural node is obtained, and a vibration transmission path is established according to the topological relationship of the structural nodes. The vibration transmission path is used to characterize the actual propagation link of vibration energy between different structural nodes inside the offshore backup power supply.

[0074] Path continuity analysis is performed on the amplitude attenuation rate between each structural node. Since a smaller amplitude attenuation rate indicates less energy loss during propagation between the corresponding nodes, continuous low amplitude attenuation rate paths are more likely to form long-distance vibration energy diffusion channels. Specifically, adjacent structural nodes with amplitude attenuation rates below a preset attenuation threshold are identified as low-dissipation connection nodes, and multiple continuous low-dissipation connection nodes are combined to generate corresponding vibration transmission paths.

[0075] It should be noted that the preset attenuation threshold refers to the amplitude attenuation rate threshold used to determine whether the structural nodes belong to a low-dissipation connection state. The preset attenuation threshold is set jointly using historical vibration propagation data and structural test data. Specifically, firstly, the amplitude attenuation rate distribution under different structural paths is statistically analyzed, then the average amplitude attenuation rate corresponding to the low-attenuation region that can form long-distance vibration propagation is extracted, and the preset attenuation threshold is set based on this average value.

[0076] Calculate the path attenuation retention factor for each vibration transmission path:

[0077] ;

[0078] in, The path attenuation preservation coefficient. This is the index value of the vibration transmission path. This represents the number of structural nodes in the vibration transmission path. The amplitude attenuation rate between adjacent structural nodes. This is the index value of the structure node.

[0079] The path attenuation retention coefficient characterizes the ability of vibration energy to continue propagating along the current path. The larger the value, the lower the loss of vibration energy when propagating along the path, and the easier it is to form energy accumulation.

[0080] After constructing the vibration transmission path, the slippage of fasteners is collected at the structural connection locations in each vibration transmission path. Specifically, displacement sensors are installed in the bolt connection area, the cable tray fixing area, and the support beam connection area to collect the displacement of the fasteners under vibration. The slippage of the fasteners is obtained by subtracting the displacement at the previous sampling time from the displacement at the current sampling time.

[0081] It should be noted that a displacement sensor is a detection device installed at the structural connection location to detect relative displacement changes in the structural connection area.

[0082] Fastener slippage is used to characterize the local stiffness stability of the structural connection area under vibration. The larger the value, the more likely the corresponding structural connection has become loose, and the more easily vibration energy is dissipated in the corresponding area.

[0083] Subsequently, the material stiffness of each structural connection location is retrieved from the structural database, and statistical processing is performed on the slippage of all fasteners in each vibration transmission path to calculate the energy dissipation index. ;

[0084] in, The energy release index. This represents the total number of structural connection points along the vibration transmission path. This refers to the amount of fastener slippage. This is the index value of the structural connection location. This refers to the material stiffness at the structural connection points.

[0085] The energy dissipation index is a dimensionless engineering evaluation index that characterizes the ability of vibration energy to dissipate in the current vibration transmission path. The larger the value, the easier it is for the structural connection area in the current path to dissipate vibration energy through microslippage; the smaller the energy dissipation index, the stronger the constraint of the current path on vibration energy, and the easier it is for vibration energy to accumulate continuously.

[0086] After calculating the energy dissipation index, the vibration dwell time is statistically analyzed for each vibration transmission path. Specifically, the vibration amplitude corresponding to each structural node is continuously monitored, and a high amplitude judgment threshold for the node is set. When the vibration amplitude of the corresponding structural node is continuously higher than the high amplitude judgment threshold, it is determined that the vibration energy has formed a dwell state at that structural node. The duration of the vibration energy forming a dwell state in each structural node is statistically analyzed to obtain the vibration dwell time.

[0087] It should be noted that the high amplitude threshold for a node refers to the vibration amplitude threshold used to determine whether a structural node has entered a state of vibration energy residence. The high amplitude threshold for a node is set based on the statistical results of node vibration amplitude under historical normal operating conditions. Specifically, the mean and standard deviation of the vibration amplitude of the corresponding structural node during long-term stable operation are statistically analyzed, and the mean vibration amplitude is superimposed with a preset multiple of the standard deviation of the vibration amplitude to generate the high amplitude threshold for the node.

[0088] Vibration dwell time is used to characterize the degree of retention of vibration energy in the corresponding structural node. The larger the value, the longer the vibration energy accumulates in the structural region, and the more likely the corresponding structural node is to develop local fatigue or resonance risk.

[0089] Subsequently, the vibration dwell time of each structural node in the same vibration transmission path is accumulated to obtain the path dwell coefficient of the corresponding vibration transmission path. The path dwell coefficient is used to characterize the overall degree of vibration energy dwell in the current vibration transmission path. The larger the value, the easier it is for vibration energy to form local accumulation in the current path.

[0090] After calculating the path dwell coefficient, the energy accumulation weight for the corresponding vibration transmission path is generated by combining the path attenuation retention coefficient and the energy release index. Specifically, the path dwell coefficient, path attenuation retention coefficient, and energy release index are standardized to obtain the path dwell factor, path attenuation retention factor, and energy release factor. The energy accumulation weight is then generated by combining these parameters.

[0091] ;

[0092] in, For energy accumulation weight, This is the path decay preservation factor. For path dwell factor, As an energy release factor, To prevent extremely small constants with a denominator of zero.

[0093] The energy accumulation weight is used to characterize the accumulation trend of vibration energy in the current vibration transmission path. The larger the value, the more the current path has both a high vibration propagation and maintenance capability and a long vibration residence time, while the vibration energy dissipation capability is weak, thus making it easier to form a local vibration energy accumulation area.

[0094] It should be noted that the standardization methods include, but are not limited to, standard linear transformation based on interval scaling, statistical Z-Score standardization, or normalization based on nonlinear mapping functions. The application methods of standardization will not be elaborated here.

[0095] In step S3, the energy accumulation weights are arranged in descending order, and the vibration transmission paths with the highest weights and the preset cumulative proportions are marked.

[0096] After merging and deduplicating the corresponding structural nodes in the marked vibration transmission path, the node set of the energy accumulation region is obtained. The node set of the energy accumulation region is taken as the energy accumulation region, which reflects the structural location where vibration energy is prone to local concentration in the offshore backup power supply.

[0097] Access the structure database to obtain the functional type identifier of the structure node corresponding to the energy accumulation area. The functional type identifier is an enumerated attribute value pre-written into the structure database, used to distinguish the functional attributes undertaken by each structure node in the offshore backup power supply. For example, the enumerated values ​​include, but are not limited to, base type, pipeline type, control cabinet type, cable tray type and smoke exhaust structure type.

[0098] It should be explained that the preset accumulation ratio can be set according to the vibration tolerance level of the offshore backup power supply under the target sea state. When the offshore backup power supply has high requirements for vibration uniformity, a larger preset accumulation ratio is adopted to expand the intervention range.

[0099] For structural nodes with different functional types, select the corresponding adjustment strategy to perform vibration transmission path redirection processing. The redirection processing includes damping adjustment, stiffness switching and flexible connection redirection processing.

[0100] Specifically, damping adjustment refers to increasing the local damping coefficient of the base damper at a structural node whose functional type is identified as a base, thereby guiding the vibration energy to other low-sensitivity nodes and reducing the degree of vibration energy accumulation at the base structure.

[0101] Stiffness switching refers to increasing the support stiffness of control cabinet nodes for structural nodes with functional types identified as control cabinets or cable trays, so that the natural vibration frequency of the control cabinet deviates from the current excitation frequency range, thus preventing sensitive components such as relays from entering a resonant response; and redistributing the counterweight positions of each section of the cable tray for cable tray nodes, changing the dynamic response characteristics of the cable tray, and dispersing the accumulated vibration energy to multiple low-sensitivity nodes.

[0102] Flexible connection refers to extending the physical length of the flexible connection section of the pipeline for structural nodes whose functional type is identified as pipeline or smoke exhaust structure, thereby increasing the equivalent impedance of the vibration transmission path and reducing the transmission efficiency of vibration energy along the pipeline; for structural nodes of smoke exhaust structure, extending the length of the flexible connection section and adjusting the support stiffness can prevent the smoke exhaust pipe from entering a resonance state at the current excitation frequency.

[0103] It should be noted that nodes in low-sensitivity areas can be structural nodes whose vibration energy is below a preset energy dispersion threshold; when extending the length of the flexible connection section of structural nodes in smoke exhaust structures, the controlled object is an adjustable-length telescopic flexible connector.

[0104] The execution results of the above adjustment strategies are saved in the form of node adjustment execution records. The node adjustment execution records include the node number, function type identifier and corresponding adjustment operation details of each energy accumulation area node.

[0105] In step S4, after the redirection process is performed, the vibration energy of each structural node is monitored. The current vibration velocity is collected by the vibration sensor at each structural node, and the current vibration energy of each node is calculated by combining it with the equivalent mass of the corresponding structural node in the structural database. The calculation formula is as follows: ,in, Vibrational energy, For equivalent quality, The vibration velocity of the structural nodes;

[0106] Using the sum of the vibration energy of each structural node pair as the weight, the phase synchronization rate is calculated for node pairs whose vibration phases are synchronized. The calculation formula is as follows: , and These are structural node pairs. The Middle The and the first Vibrational energy of each structural node For structural node pairs The phase synchronization indicator quantity, when the structural node is... When the phase difference between nodes is less than the preset synchronization threshold, Take 1, when When the phase difference between nodes is greater than or equal to a preset synchronization threshold, Take 0, Phase synchronization rate;

[0107] The higher the phase synchronization rate, the greater the degree to which the phases of structural nodes with higher vibration energy tend to be synchronized, and the greater the risk of overall resonance amplification.

[0108] When the phase synchronization rate is greater than the preset external resonance trigger threshold, it is determined that the offshore backup power supply has an external resonance trend, and the response threshold of the base damper is adjusted.

[0109] Conversely, when the phase synchronization rate is less than the preset external resonance trigger threshold, it is determined that the marine backup power supply does not have an external resonance trend, and there is no need to adjust the response threshold of the base damper.

[0110] After determining that there is a tendency for external resonance, the response threshold of the base damper is retrieved from the base damper configuration database. The response threshold is the default response sensitivity of the base damper when it is not affected by external resonance.

[0111] Control the response threshold of the base damper: ,in, For phase synchronization rate, The preset damping control sensitivity coefficient, The response threshold of the base damper. The response threshold after adjusting the base damper.

[0112] The vibration energy at the base structure is compared based on the adjusted response threshold. When the vibration energy at the base structure exceeds the adjusted response threshold, the base damper is triggered to apply damping force to suppress the spread of vibration energy to other structural nodes.

[0113] It should be noted that the preset peripheral resonance trigger threshold can be set according to the maximum allowable vibration synchronization degree of the offshore backup power supply under the target sea state; the preset damping control sensitivity coefficient can be set according to the adjustment stroke range of the base damper and the vibration tolerance limit of the offshore backup power supply; the preset synchronization judgment threshold is determined according to the statistical distribution of the phase difference of each node under the rated operating conditions of the offshore backup power supply; the base damper configuration database refers to a structured data set that stores the operating parameters and control history of the base damper, indexed by the damper number.

[0114] Finally, it should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0115] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0116] In this document, the singular forms “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that terms such as “comprising / including” or “having” specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0117] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0118] The above description of the disclosed embodiments will enable those skilled in the art to make or use various modifications to these embodiments. It will be readily apparent to those skilled in the art that the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An adaptive control method for vibration reduction of offshore backup power supply based on vibration transmission, characterized in that: Includes the following steps: Step S1: Access the structural database to retrieve the structural node information of the offshore backup power supply and perform phase analysis. Based on the phase analysis results, determine whether a vibration bypass effect has been formed. If a vibration bypass effect has been formed, detect the amplitude attenuation rate of each structural node. Step S2: Construct vibration transmission paths based on amplitude attenuation rate, collect fastener slippage of each vibration transmission path and calculate energy dissipation index, count vibration residence time of vibration transmission paths, and generate energy accumulation weights by combining energy dissipation index; Step S3: Identify the energy accumulation area based on the energy accumulation weight, obtain the functional type identifier of the energy accumulation area, and select different adjustment strategies to perform redirection processing on the vibration transmission path according to the functional type identifier; Step S4: After performing the redirection process, monitor the vibration energy of each structural node and calculate the phase synchronization rate. Based on the phase synchronization rate, assess the external resonance trend of the offshore backup power supply and determine whether to adjust the response threshold of the base damper based on the external resonance trend.

2. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 1, characterized in that: In step S1, the structural database is accessed to retrieve the structural node information corresponding to the offshore backup power supply. The structural node information includes diesel generator base nodes, fuel pipe flexible connection nodes, control cabinet installation nodes, cable tray suspension nodes, exhaust corrugated pipe support nodes, and container top support nodes; The structural propagation links are generated according to the structural connection sequence of the structural nodes. The structural propagation links refer to the set of vibration propagation sequences generated based on the actual connection relationship between the structural nodes. Vibration sensors installed at each structural node are used to collect the node vibration signals of the corresponding structural node. The node vibration signal is the vibration acceleration of the corresponding structural node at the current sampling time. Frequency domain decomposition processing is performed on the nodal vibration signal to obtain the vibration amplitude and corresponding vibration phase of the structural node; Calculate the absolute difference in vibration phase between any two adjacent structural nodes to obtain the node phase difference.

3. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 2, characterized in that: In step S1, the difference between the current node phase difference and the node phase difference in the previous sampling period is calculated in each sampling period to obtain the change in node phase difference. When the changes in the phase difference of nodes corresponding to consecutive adjacent sampling periods all maintain the same sign, it is determined that the changes in the phase difference of the corresponding nodes satisfy the condition of changing in the same direction. The percentage of samples that meet the same-direction change condition within the sliding time window is obtained by dividing the number of samples within the sliding time window by the total number of sampling periods. When the proportion of changes in the same direction exceeds the preset trend maintenance ratio threshold, it is determined that a vibration bypass effect has been formed; otherwise, it is determined that no vibration bypass effect has been formed. After the vibration bypass effect is formed, the input vibration amplitude of the preceding structural node and the output vibration amplitude of the following structural node in the structural propagation link are obtained and subtracted. The result of the subtraction is divided by the input vibration amplitude of the preceding structural node to obtain the amplitude attenuation rate between the preceding and following structural nodes.

4. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 1, characterized in that: In step S2, adjacent structural nodes with amplitude attenuation rates lower than a preset attenuation threshold are identified as low-dissipation connection nodes, and multiple consecutive low-dissipation connection nodes are combined to generate corresponding vibration transmission paths. The path attenuation retention coefficient of each vibration transmission path is calculated. The displacement of the fastener under vibration is collected, and the displacement at the current sampling moment is subtracted from the displacement at the previous sampling moment to obtain the fastener slippage. Access the structural database to retrieve the material stiffness of each structural connection location, and perform statistical processing on the slippage of all fasteners in each vibration transmission path to calculate the energy dissipation index; The vibration amplitude of each structural node is continuously monitored, and a high amplitude judgment threshold is set for the node. When the vibration amplitude of the corresponding structural node is continuously higher than the high amplitude judgment threshold, it is determined that the vibration energy forms a stationary state at the structural node. The duration of the vibration energy forming a stationary state in each structural node is counted to obtain the vibration stationary time.

5. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 4, characterized in that: In step S2, the vibration dwell time of each structural node in the same vibration transmission path is accumulated to obtain the path dwell coefficient of the corresponding vibration transmission path. The path dwell coefficient, path attenuation retention coefficient, and energy release index are standardized to obtain the path dwell factor, path attenuation retention factor, and energy release factor, respectively. The energy accumulation weight is generated by combining the path dwell factor, path decay maintenance factor, and energy release factor. ; in, For energy accumulation weight, This is the path decay preservation factor. For path dwell factor, As an energy release factor, To prevent extremely small constants with a denominator of zero.

6. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 1, characterized in that: In step S3, the energy accumulation weights are arranged in descending order, and the vibration transmission paths with the highest weights and the preset cumulative proportions are marked. After merging and deduplicating the corresponding structural nodes in the marked vibration transmission path, the node set of the energy accumulation region is obtained, and the node set of the energy accumulation region is taken as the energy accumulation region. Access the structure database to obtain the function type identifier of the structure node corresponding to the energy accumulation area. The function type identifier is an enumerated attribute value that is pre-written into the structure database. For structural nodes with different functional types, the corresponding adjustment strategy is selected to perform vibration transmission path redirection processing. The redirection processing includes damping adjustment, stiffness switching, and flexible connection redirection processing.

7. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 6, characterized in that: In step S3, the corresponding adjustment strategy is selected based on the structural nodes identified by different functional types to perform vibration transmission path redirection processing; Specifically, damping adjustment is performed on base-type structural nodes, stiffness switching is performed on control cabinet or cable tray-type structural nodes, and flexible connection redirection is performed on pipeline or smoke exhaust structural nodes.

8. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 1, characterized in that: In step S4, after the redirection process is performed, the vibration energy of each structural node is monitored. The current vibration velocity is collected by the vibration sensor at each structural node, and combined with the equivalent mass of the corresponding structural node in the structural database, the current vibration energy of each node is calculated. Based on the vibration energy corresponding to each structural node, the phase synchronization state between each structural node is weighted and calculated to obtain the phase synchronization rate. When the absolute value of the phase difference between structural node pairs is less than the preset synchronization judgment threshold, the corresponding structural node pairs are determined to be in a synchronized state.

9. The vibration reduction adaptive control method for offshore backup power supply based on vibration transmission according to claim 8, characterized in that: In step S4, when the phase synchronization rate is greater than the preset peripheral resonance trigger threshold, it is determined that the marine backup power supply has a peripheral resonance trend, and the response threshold of the base damper is adjusted. Conversely, when the phase synchronization rate is less than the preset external resonance trigger threshold, it is determined that the marine backup power supply does not have an external resonance trend, and there is no need to adjust the response threshold of the base damper. After determining that there is a tendency for external resonance, access the base damper configuration database to retrieve the response threshold of the base damper; Control the response threshold of the base damper: ,in, For phase synchronization rate, The preset damping control sensitivity coefficient, The response threshold of the base damper. The response threshold after adjusting the base damper.

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