Modeling for performance degradation induced by wear of a hydraulic actuator of a hydraulic excavator

Abstract

As an index of maintaining low fuel consumption, the digging force of an excavator is affected fully by the performance of the hydraulic actuators including boom cylinder, stick cylinder, and bucket cylinder. The seals are used widely in a fluid power system to prevent fluid leakage. However, wear induces changes in the diameter of the seal's cross-section area, having an effect on the sealing capability of seals. This article proposes a model for performance degradation induced by wear of a hydraulic actuator of an excavator. The model in this article describes the physical process of performance degradation of a hydraulic actuator by analyzing piston response when wear occurs. The model includes a dynamic model of a hydraulic actuator, a model of squeezing stress and deformation of a compressed elastomeric O-ring seal, a wear model of a seal, and a leak rate model. These models can be used for deducing the laws of performance degradation of a hydraulic actuator of an excavator and for predicting the useful life of a key component such as the seal. Finally, based on the established model, simulation results of a hydraulic actuator’s response are provided.

Keywords

Hydraulic actuator fluid power system performance degradation fluid leakage wear hydraulic excavator

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References

Wang DZ, Rohde SM and Oh KP. Hydraulic system modeling and simulation in the automotive industry. In: Proceedings of the ASME winter annual meeting, Dallas, TX, 25–30 November 1990, ASME paper no. 90-WA/FPST-4.

Hogan PA, Burrows CR and Edge KA. Development of knowledge based system for the diagnosis of faults in hydraulic circuits. In: Proceedings of the ASME winter annual meeting, Dallas, TX, 25–30 November 1990, ASME paper no. 90-WA/FPST-2.

Scoville RI and Maxwell MJ. Concurrent design/analysis tools for aircraft hydraulic systems. In: Aerospace technology conference exposition, Long Beach, CA, 1–4 October 1990, SAE technical paper no. 902004.

Bang BJ and Draxler JG. Dynamic hydraulic system simulation: an integrated approach. In: Aerospace technology conference exposition, Long Beach, CA, 1–4 October 1990, SAE technical paper no. 902003.

Garimella P and Yao B. Model based fault detection of an electro-hydraulic cylinder. In: Proceedings of the 2005 American control conference, Portland, OR, 8–10 June 2005, pp. 484--489.

Shi

Lennox

. The development of an adaptive threshold for model-based fault detection of a nonlinear electro-hydraulic system. Control Eng Pract 2005; 13: 1357–1367.

Persson

BNJ

Yang

. Theory of the leak-rate of seals. J Phys Condens Matter 2008; 20(3): 315011–315011.

Lorenz

Persson

BNJ

. Leak rate of seals: comparison of theory with experiment. Europhys Lett 2009; 86(4): 44006–44006.

Theyse FH. The inverse hydrodynamic theory and its application in the design of controlled leakage seals between moving parts. In: Proceedings of the third international conference on fluid sealing, Cambridge, England, UK, 1967, pp.17–32. Cranfield, Bedford: The British Hydromechanics Research Association.

10.

Lindley

. Compression characteristics of laterally-unrestrained rubber O-rings. J Int Rubber Inst 1967; 1: 202–213.

11.

Green I and English C. Stresses and deformation of compressed elastomeric O-ring seals. In: 14th international conference on fluid sealing, Firenze, Italy, April 1994, pp.6–8. Cranfield, Bedford, UK: BHRGroup Limited.

12.

Archard

. Contact and rubbing of flat surfaces. J Appl Phys 1953; 24: 981–981.

13.

Burr

Marshek

. An equation for the abrasive wear of elastomeric O-ring materials. Wear 1982; 81(2): 347–356.

14.

C-H

Tsai

C-C

. Adaptive predictive control with recurrent neural network for industrial processes: an application to temperature control of a variable-frequency oil-cooling machine. IEEE Trans Ind Electron 2008; 55(3): 1366–1375.