State monitoring and fault diagnosis method and device for hydraulic system
A hydraulic system and fault diagnosis technology, applied in the field of hydraulic systems, can solve problems such as difficult monitoring and inaccurate fault prediction
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Embodiment 1
[0082] A specific embodiment of the present invention discloses a state monitoring and fault diagnosis method for a hydraulic system, such as figure 1 shown, including the following steps:
[0083] S1. Arrange multi-information sensors in the hydraulic system to monitor the running status of the corresponding parts in real time;
[0084] S2. When any operating state changes, extract the feature information corresponding to the state and input it into the pre-trained deep neural network to obtain the probability of failure of each part of the hydraulic system;
[0085] S3. Normalize the probability of failure of the above-mentioned parts, and input the normalized results into the pre-trained D-S evidence decision-making model to obtain the most likely failure parts and failure levels, and push them to the operator.
[0086] During implementation, the key components (parts) of the hydraulic system can be monitored and detected through the methods of steps S1 to S3.
[0087] Co...
Embodiment 2
[0089] On the basis of the method described in Embodiment 1, the multi-information sensor in step S1 includes at least one of a pressure sensor, a flow sensor, a vibration sensor, and a temperature sensor.
[0090] The hydraulic system includes a hydraulic pump 3, a reversing valve 4, a (one-way) speed control valve 5, a hydraulic cylinder 6, and a proportional relief valve 7. The specific structure is as follows figure 2 shown.
[0091] Preferably, step S1 further comprises:
[0092] S11. Arrange pressure sensors at the oil outlet of the hydraulic pump 3, the positive and negative chambers of the hydraulic cylinder 6, the reversing valve 4 and the speed regulating valve 5;
[0093] S12. Arrange a flow sensor at the oil outlet of the hydraulic pump 3;
[0094] S13. Vibration sensors are arranged on key parts such as hydraulic pump 3, motor 2, the surface of hydraulic mechanical locking cylinder or friction pair parts;
[0095] S14. Arrange temperature sensors at the oil ou...
Embodiment 3
[0121] The present invention also discloses a state monitoring and fault diagnosis device for a hydraulic system corresponding to the method in Embodiment 1, comprising multi-information sensors, a preprocessing module, and a fault diagnosis module connected in sequence, such as image 3 shown.
[0122] Multi-information sensors are used to monitor the running status of each part of the hydraulic system in real time and send it to the preprocessing module.
[0123] The preprocessing module is used to determine whether the operating state of each part of the hydraulic system has changed. When any operating state changes, extract the feature information corresponding to the state, input the pre-trained deep neural network, and obtain the various parts of the hydraulic system. The probability of failure is transmitted to the fault diagnosis module.
[0124] The fault diagnosis module is used to normalize the probability of failure of the above-mentioned parts, and input the norm...
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