A geometrically inspired quantification approach for valve stiction using Riemannian logarithmic map

Huang, Bo; Hu, Li-Sheng

doi:10.1016/j.measurement.2022.111562

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…A typical control loop structure diagram is shown in Figure 1, where SP, OP, MV, and PV represent setpoint, controller output, valve position, and process output, respectively. Figure 2 shows the structure diagram of the valve [9,32,34]. On the basis of Newton's second law, the force balance equation for the valve stem is as follows [9,15]:…”

Section: Valve Stictionmentioning

confidence: 99%

“…Similarly, OP-PV in Figure 4b is also a limit cycle shape. Since the variable MV in most actual control loops is difficult to measure [34], the proposed method uses OP and PV data to detect valve static friction, which is more practical. Figure 5 shows the OP and PV curves with a sticky control valve, taken from a simple numerical simulation example.…”

Section: Valve Stictionmentioning

confidence: 99%

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Valve Stiction Detection Method Based on Dynamic Slow Feature Analysis and Hurst Exponent

Shang

Zhang

2023

Processes

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Valve stiction is the most common root of oscillation faults in process control systems, and it can cause the severe deterioration of control performance and system instability, ultimately impacting product quality and process safety. A new method for detecting valve stiction, based on dynamic slow feature analysis (DSFA) and the Hurst exponent, is proposed in this paper. The proposed method first utilizes DSFA to extract slow features (SFs) from the preprocessed and reconstructed data of the controller output and the controlled process variable; then, it calculates the Hurst exponent of the slowest SF to quantify its long-term correlation; and, finally, it defines a new valve detection index to identify valve stiction. The results obtained from simulations and actual process case studies demonstrate that the proposed method, based on a DSFA–Hurst exponent, can effectively detect valve stiction in control loops.

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