CN-122017554-A - Vibration isolation state detection equipment for ship diesel generator set

CN122017554ACN 122017554 ACN122017554 ACN 122017554ACN-122017554-A

Abstract

The invention belongs to the technical field of vibration isolation detection, and particularly relates to vibration isolation state detection equipment of a ship diesel generator set, which is used for acquiring multidimensional parameter sequences of unit body vibration, basic vibration and vibration isolation system temperature field distribution through a sensor array, respectively calculating a first characteristic value representing spectrum energy distribution, a second characteristic value representing time domain statistical characteristics and a third characteristic value representing temperature field uniformity and hot spot intensity, wherein a comprehensive module carries out weighted fusion on the three characteristic values to generate a real-time risk index, and a twin response module triggers corresponding adjustment action based on the index and carries out simulation optimization by combining a digital twin model; the invention realizes the accurate diagnosis and predictive protection of faults such as rotor unbalance, vibration isolator impact, bolt looseness, abnormal temperature rise and the like, and remarkably improves the operation reliability and safety of the ship generator set.

Inventors

WANG LIHUI
LU TAO
ZHANG WENHUI

Assignees

上海航数智能科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. The vibration isolation state detection device of the ship diesel generator set is characterized by comprising an acquisition module, a frequency spectrum analysis module, a statistical analysis module, a temperature field module, a comprehensive module and a twin response module; the acquisition module is used for preprocessing signals by adopting a configured sensor array and combining with a filter to acquire a first real-time parameter sequence, a second real-time parameter sequence and a third real-time parameter sequence of the ship diesel generator set; the spectrum analysis module is used for calculating a first characteristic value representing the vibration spectrum energy distribution of the body based on the first real-time parameter sequence; the statistical analysis module calculates a second characteristic value representing the basic vibration time domain statistical characteristic based on the second real-time parameter sequence; The temperature field module calculates a third characteristic value representing the distribution uniformity of the temperature field and the intensity of the hot spot based on the third real-time parameter sequence; the comprehensive module performs weighted combination based on the first characteristic value, the second characteristic value and the third characteristic value to generate a real-time risk index representing the current vibration isolation state and the health risk level; the twin response module is used for responding that the real-time risk index meets a preset trigger condition, selecting an adjustment action corresponding to the trigger condition from an action set comprising at least three adjustment actions, and combining a twin simulation algorithm to perform real-time simulation and real-time risk index monitoring and adjustment.
2. The marine diesel generator set vibration isolation state detection device according to claim 1, wherein the first real-time parameter sequence is used for representing a body vibration state of a marine generator set, the second real-time parameter sequence is used for representing a vibration state of a ship generator set foundation or a vibration isolation system, the third real-time parameter sequence is used for representing a temperature field distribution state of a key area of the vibration isolation system, the first characteristic value is used for indicating a rotor imbalance or a centering poor risk in unit operation, the time domain statistical characteristic is related to random interference of unit vibration and external environment vibration and is used for indicating a shock or bolt loosening risk of the vibration isolator, the third characteristic value is used for indicating an abnormal temperature rise risk of the vibration isolator caused by at least one of overload abnormality, aging abnormality or internal friction abnormality, and the adjusting action at least comprises sending an early warning signal, sending an alarm signal, executing a unit load reduction operation or executing a unit switching operation.
3. The marine diesel generator set vibration isolation state detection apparatus of claim 2, wherein the signal preprocessing using the configured sensor array in combination with the filter comprises: synchronously acquiring an original vibration signal and an original infrared image of the ship diesel generator set through a configured sensor array; Based on an original vibration signal, performing impedance matching and signal amplification through a charge amplifier, and performing synchronous sampling by adopting a 16-bit precision analog-to-digital converter at a sampling rate not lower than a preset multiple of the highest analysis frequency to obtain a discretized digital vibration sequence; Based on the discretized digital vibration sequence, intercepting a signal of a section of equipment in a static state or calculating a direct current component of the discretized digital vibration sequence by utilizing the stop band characteristic of a high-pass filter; and subtracting the direct current component of the discretized digital vibration sequence from each data point in the discretized digital vibration sequence to obtain a vibration signal with zero offset.
4. A marine diesel generator set vibration isolation state detection apparatus according to claim 3, wherein the signal preprocessing is performed by using the configured sensor array in combination with a filter, and further comprising: inputting the zero-offset vibration signal into a fourth-order Butterworth low-pass filter with cut-off frequency set as a preset multiple of the highest working frequency of the unit, filtering out a high-frequency vibration signal above the highest working frequency of the unit, and obtaining a first preprocessing vibration signal; Inputting the first preprocessing vibration signal to a linear phase FIR band-pass filter comprising a passband frequency range constructed by the set rated rotation speed corresponding to the fundamental frequency and a Hanning window function, and obtaining a first real-time parameter sequence and a second real-time parameter sequence; Based on standard data calibrated under different temperature points by a standard reference blackbody in advance, performing two-point correction calculation on each input frame of original infrared image to obtain an initial calibration infrared image; based on the initial calibration infrared image, carrying out two-dimensional convolution operation by combining a Gaussian convolution kernel of 3×3 pixels to obtain a spatially smooth temperature field image; and independently executing time domain median filtering on each pixel position in the temperature field image with the space smoothing function to obtain a preprocessed third real-time parameter sequence.
5. The marine diesel generator set vibration isolation state detection apparatus of claim 4, wherein calculating a first eigenvalue that characterizes an energy distribution of a body vibration spectrum comprises: Based on the first real-time parameter sequence, converting the time domain vibration signal into a frequency domain frequency spectrum by adopting a fast Fourier transform algorithm, and acquiring complex frequency spectrum data containing amplitude and phase information; Obtaining a frequency band interval set based on the complex frequency spectrum data in combination with a preset frequency band characteristic division rule, wherein the frequency band interval set comprises a base frequency band, a double frequency band and a high frequency characteristic band; Performing integral operation on the square of the amplitude of each frequency point in each frequency band interval in the frequency band interval set to obtain a frequency band energy value sequence, wherein the frequency band energy value sequence comprises a base frequency band energy value, a double frequency band energy value and a high-frequency characteristic frequency band energy value; And based on the fundamental frequency band energy value, the double frequency band energy value and the high-frequency characteristic band energy value, a first characteristic value representing the body vibration spectrum energy distribution is obtained.
6. The marine diesel generator set vibration isolation state detection apparatus of claim 5, wherein calculating a second eigenvalue that characterizes a time domain statistical characteristic of base vibrations comprises: Sliding a time window based on the second real-time parameter sequence combined with the configured fixed duration to obtain a plurality of overlapped sub-period signal sets; Based on each sub-period signal set, parallelly calculating a time domain statistical parameter set of each sub-period signal, wherein the time domain statistical parameter set comprises peak-to-peak value, kurtosis value, peak factor and pulse index of the sub-period signal; Based on a preset interference component threshold rule, filtering the time domain statistical parameter set to obtain a filtered effective time domain statistical parameter set; based on the filtered effective time domain statistical parameter set and combined with a preset weighting contribution weight, obtaining a characteristic value of each effective sub-period; and taking 95% of the fractional digits of the characteristic values of all the effective subperiods as second characteristic values for representing the time domain statistical characteristics of the basic vibration.
7. The marine diesel generator set vibration isolation state detection apparatus of claim 6, wherein calculating a third eigenvalue that characterizes temperature field distribution uniformity and hot spot intensity comprises: based on the third real-time parameter sequence, extracting a hot spot candidate region in the temperature field image by adopting a self-adaptive threshold segmentation algorithm, wherein the self-adaptive threshold is determined by calculating a bimodal threshold value of an image gray level histogram; performing morphological closing operation on the hot spot candidate region to obtain an effective hot spot region set; Calculating a hotspot characteristic parameter set based on the effective hotspot region set, wherein the hotspot characteristic parameter set comprises a hotspot region total area occupation ratio, a hotspot region highest temperature and a global average temperature difference value; calculating a coefficient of variation of the global temperature distribution based on pixel temperature values of the temperature field image to characterize uniformity; And combining a preset uniformity weight and a preset hot spot intensity weight, and carrying out weighted fusion on the variation coefficient and the hot spot characteristic parameter set to obtain a third characteristic value representing the distribution uniformity of the temperature field and the hot spot intensity.
8. The marine diesel generator set vibration isolation state detection device of claim 7, wherein the real-time simulation and real-time risk indicator monitoring and adjustment combined with the twin simulation algorithm comprises: The real-time risk index value representing the current vibration isolation state and the health risk level and a preset risk index value threshold value are subjected to overall abnormality judgment, when the real-time risk index value is larger than the preset risk index value threshold value, the vibration isolation state is judged to be globally abnormal, an alarm is given, and an abnormality degree value of the vibration isolation state is obtained based on the real-time risk index value; when the vibration isolation state is judged to be abnormal, according to the vibration isolation state abnormal degree value, the first characteristic value, the second characteristic value and the third characteristic value, combining a preset characteristic value-fault type-abnormal degree mapping table, and obtaining the abnormal degree corresponding to the current global abnormal type combination set; And obtaining a global candidate adjustment action parameter set based on the abnormality degree corresponding to the current global abnormality type combination set and an abnormality type-adjustment action type-adjustment degree mapping table, wherein the adjustment degree comprises adjustment priority of each adjustment action, adjustment time length of the corresponding adjustment action and the size of an adjustment unit range.
9. The marine diesel generator set vibration isolation state detection device of claim 8, wherein real-time simulation and real-time risk indicator monitoring and adjustment are performed in combination with a twin simulation algorithm, further comprising: based on the global candidate adjustment action parameter set and a twin simulation model constructed by a ship diesel generator set, acquiring a global deduction response data set after abnormal simulation adjustment; The global optimal adjustment action combination set is obtained by combining the global deduction response data set with a multi-objective optimization decision algorithm and taking the maximum preset comprehensive decision factor as a target, the comprehensive decision factor is obtained by weighting and obtaining an influence comprehensive score and a performance comprehensive score, the performance comprehensive score is obtained by weighting and obtaining the vibration suppression rate, the temperature drop amplitude and the state stability recovery time length which are monitored in real time, and the influence comprehensive score is obtained by weighting and obtaining the execution time consumption, the equipment loss and the action execution risk probability of the optimal adjustment action combination set.
10. The marine diesel generator set vibration isolation state detection device of claim 9, wherein real-time simulation and real-time risk indicator monitoring and adjustment are performed in combination with a twin simulation algorithm, further comprising: When the real-time risk index value is smaller than or equal to a preset risk index value threshold value and at least one of the first characteristic value, the second characteristic value and the third characteristic value is larger than a preset abnormality judgment threshold value, judging that the vibration isolation state is locally abnormal, and giving an alarm; obtaining the abnormality degree corresponding to the current local abnormality type combination set based on the characteristic value of the characteristic value set corresponding to the local abnormality of the vibration isolation state and the characteristic value-fault type-abnormality degree mapping table; obtaining a local candidate adjustment action parameter set based on the abnormality degree corresponding to the current local abnormality type combination set and an abnormality type-adjustment action type-adjustment degree mapping table; repeating the twin simulation and multi-objective optimization process based on the local candidate adjustment action parameter set to obtain a local optimal adjustment action combination set; When the real-time risk index value is smaller than or equal to a preset risk index value threshold and the first characteristic value, the second characteristic value and the third characteristic value are smaller than the preset abnormality judgment characteristic, the change trend of the first characteristic value, the second characteristic value and the third characteristic value is monitored in real time according to preset data intervals, and when the difference value between at least one characteristic value and the corresponding preset abnormality judgment threshold is smaller than a preset risk early warning threshold, early warning operation is carried out, meanwhile, the early warning grade is determined according to the change rate of the corresponding characteristic value, and real-time early warning of the corresponding grade is carried out.

Description

Vibration isolation state detection equipment for ship diesel generator set Technical Field The invention belongs to the technical field of vibration isolation detection, and particularly relates to vibration isolation state detection equipment for a ship diesel generator set. Background In the prior art, the state monitoring of the vibration isolation system of the ship diesel generator set mainly depends on a threshold alarming mechanism of a single physical parameter, such as independently monitoring vibration amplitude or temperature value, and triggering an alarm when the detection value exceeds a preset fixed threshold. However, in actual operation, the marine diesel generator set is in a complex multi-physical field coupling environment, faults of a vibration isolation system often appear as mutual correlation and co-evolution of vibration characteristics and temperature characteristics, and a single parameter monitoring method cannot effectively identify composite faults caused by combined actions of multiple factors such as rotor imbalance, poor centering, vibration isolator impact, bolt loosening, overload ageing and the like. The limitation of the monitoring mode causes that the system is difficult to accurately distinguish fault types and cannot locate fault positions, weak characteristic changes cannot be captured in early fault, and the problems of false alarm, missing alarm or alarm lag and the like often occur, so that the safe and stable operation of the ship generator set is seriously influenced. Therefore, a vibration isolation state detection scheme capable of integrating multiple physical field information and realizing early and accurate diagnosis is urgently needed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides vibration isolation state detection equipment of a ship diesel generator set, which collects multidimensional parameter sequences of unit body vibration, basic vibration and vibration isolation system temperature field distribution through a sensor array, respectively calculates a first characteristic value representing spectrum energy distribution, a second characteristic value representing time domain statistical characteristics and a third characteristic value representing temperature field uniformity and hot spot intensity, and a comprehensive module carries out weighted fusion on the three characteristic values to generate a real-time risk index, a twin response module triggers corresponding adjustment action based on the index and combines a digital twin model to carry out simulation optimization. In order to achieve the above purpose, the present invention provides the following technical solutions: The vibration isolation state detection device of the ship diesel generator set comprises an acquisition module, a frequency spectrum analysis module, a statistical analysis module, a temperature field module, a comprehensive module and a twin response module; The acquisition module is used for preprocessing signals by adopting a configured sensor array and combining with a filter to acquire a first real-time parameter sequence, a second real-time parameter sequence and a third real-time parameter sequence of the ship diesel generator set; the frequency spectrum analysis module is used for calculating a first characteristic value representing the vibration frequency spectrum energy distribution of the body based on the first real-time parameter sequence; The statistical analysis module is used for calculating a second characteristic value representing the basic vibration time domain statistical characteristic based on the second real-time parameter sequence; the temperature field module is used for calculating a third characteristic value representing the distribution uniformity of the temperature field and the intensity of the hot spot based on the third real-time parameter sequence; The comprehensive module is used for carrying out weighted combination based on the first characteristic value, the second characteristic value and the third characteristic value to generate a real-time risk index representing the current vibration isolation state and the health risk level; And the twin response module is used for responding that the real-time risk index meets a preset trigger condition, selecting an adjusting action corresponding to the trigger condition from an action set comprising at least three adjusting actions, and combining a twin simulation algorithm to perform real-time simulation and real-time risk index monitoring and adjustment. The method comprises the steps of determining a first real-time parameter sequence representing the vibration state of a body of a ship generator set, determining a second real-time parameter sequence representing the vibration state of a ship generator set foundation or vibration isolation system, determining a third real-time parameter sequence representing the temperature field distribution state o