A Convolutional Autoencoder Based Fault Diagnosis Method for a Hydraulic Solenoid Valve Considering Unknown Faults

Abstract

The hydraulic solenoid valve is an essential electromechanical component used in various industries to control the flow rate, pressure, and direction of hydraulic fluid. However, these valves can fail due to factors like electrical issues, mechanical wear, contamination, seal failure, or improper assembly; these failures can lead to system downtime and safety risks. To address hydraulic solenoid valve failure, and its related impacts, this study aimed to develop a nondestructive diagnostic technology for rapid and accurate diagnosis of valve failures. The proposed approach is based on a data-driven model that uses voltage and current signals measured from normal and faulty valve samples. The algorithm utilizes a convolutional autoencoder and hypersphere-based clustering of the latent variables. This clustering approach helps to identify patterns and categorize the samples into distinct groups, normal and faulty. By clustering the data into groups of hyperspheres, the algorithm identifies the specific fault type, including both known and potentially new fault types. The proposed diagnostic model successfully achieved an accuracy rate of 98% in classifying the measurement data, which were augmented with white noise across seven distinct fault modes. This high accuracy demonstrates the effectiveness of the proposed diagnosis method for accurate and prompt identification of faults present in actual hydraulic solenoid valves.

Fault diagnosis of control valves based on small-sample hybrid physics improved Resnet

“…Sun et al [2] employed mathematical model (MM) interpolation alongside a modified deep residual shrinkage network (MDRSN) to diagnose faults in control valves across various openings, demonstrating the method's efficacy primarily in scenarios with missing valve data. Yoo et al [3] introduced a convolutional autoencoderbased approach using voltage and current signals for diagnosing hydraulic solenoid valves. Liu et al [4] developed a model for diagnosing faults in electro-hydraulic servo valves using an extreme learning machine fed with no-load flow characteristic curves, achieving faster modeling and better classification accuracy compared to support vector machines and genetic algorithms.…”