SEWHAPM: Development of a Water Hydraulic Axial Piston Motor for Underwater Tool Systems

Proceedings of the Institution of Mechanical Engineers, Part E:

et al. 2010

An improved mathematic model of management of filters in a fluid power system (FPS) under uncertainty was developed in this article based on the former hybrid optimization method. The model integrated the interval-fuzzy quadratic programming model into an improved model of contaminant control for the selection of filters finenesses, the estimation of service life of pumps, and replacement strategies of filters in an FPS under uncertainty. The fuzzy quadratic optimization approach was used in the model to handle the uncertainties existing not only in the contaminant holding capacity, but also in the contamination level and contaminant sensitivity. The integrated model has been applied in a case of selecting filter fineness and planning allocation and replacement strategies under uncertainty for an FPS with bypass filtration circuit. All of the scenarios with available filter fineness have been examined. The generated decision alternatives can help decision makers to identify desired policies for contamination control under various total costs, satisfaction degrees, and system-failure risks under different contaminant ingression/generation rates.

Section: Results Analysismentioning

confidence: 99%

“…Combining equations (4b), (6), and 8, the expression of the contaminant ingression/generation rates can be obtained as…”

Section: Fig 1 Fps With a Bypass Filtration Systemmentioning

confidence: 99%

Improved interval-fuzzy quadratic programming for management of filters in a fluid power system under uncertainty

Proceedings of the Institution of Mechanical Engineers, Part E:

et al. 2010

“…Characterization, methodology, and design Statement of problem As physicochemical properties of water are significantly different from those of mineral oil and other fluids, those issues should be considered in developing water hydraulic pumps. 13 First, the low viscosity of water can increase difficulty in forming hydrodynamic lubrication films between sliding bearing frictional pairs, and the insignificant responses of viscosity variations with water pressure do not result in EHL. Second, the low viscosity is associated with the poor lubricity of water, which means that the corrosive wear and erosion of water hydraulic components occurs easily.…”

Section: Introductionmentioning

confidence: 99%

Research on the sliding bearing pair of water hydraulic axial piston pump

Yin

Proceedings of the Institution of Mechanical Engineers, Part C:

Zhang

et al. 2013

Sliding bearing pair is one of the important friction pairs within water hydraulic axial piston pump, which can result in significant influences on the pump's performance. Generally, owing to the characteristics of low viscosity and poor lubrication of water, the sliding bearing will operate under condition of dry or mixed lubrication, leading to a severe adhesives wear and material softening. In order to investigate the flow field of the sliding bearing in hydrodynamic condition, the effects of the water film pressure distribution, load carrying capacity changing with radial clearance and width-radius ratio of the sliding bearing pair have been simulated through MATLAB. And a suitable material combination of the sliding bearing pair was selected though a custom-manufactured friction and wear test rig. Based on the theoretical and experimental studies, an appropriate structure of the sliding bearing within water hydraulic axial piston pump was designed. The loading experiments for the developed water hydraulic axial piston pump assembled with two different flanges have been conducted at a water hydraulic component test rig. The experimental results revealed that the volumetric efficiency and noise characteristics of the pump are remarkably improved when the sliding bearing work under hydrodynamic lubrication condition in comparison with dry lubrication condition. The research results have laid the foundation for the development and improvement of the water hydraulic axial piston pump.

“…However, WHM works with high-pressure and high-speed owing to the high pv values of friction pairs and the severe wear subject to the repeated alternating loads. 4,5 Bhushan and Gray 6 investigated several material combinations under high load and speed in synthetic seawater. They reported that the pv values of friction pairs in an axial piston motor were each one-third of those in a vane motor and one-tenth of those in a gear motor when the friction pairs adopted an identical material combination.…”

Section: Introductionmentioning

confidence: 99%

Non-probabilistic wear reliability analysis of swash-plate/slipper of water hydraulic piston motor based on convex model

Liang

Proceedings of the Institution of Mechanical Engineers, Part C:

Zhang

2012

Water hydraulic piston motor is one of the important transmission components in a water hydraulic system. For lack of enough experimental information to analyze the reliability in water hydraulic motor design, the convex model is chosen as wear reliability model for hydraulic friction pairs, which is more economical and reasonable than the interval model. The non-probabilistic reliability index based on the convex model is established using first-order Taylor series expansion, and the non-probabilistic reliability model of wear reliability analysis for the friction pair of swash-plate/slipper in water hydraulic piston motor is introduced based on the convex model. For the non-probabilistic reliability model, only the bounds on uncertain parameters are needed, instead of probabilistic density distribution or statistical quantities. Numerical examples are used to illustrate the validity and feasibility of the presented method.