Abstract Lubricants for stern tube systems are subject to increasingly stringent requirements in terms of environmental compatibility, as any lubricant leakage leads contamination the sea. As a result, interest environmentally acceptable lubricants (EALs) is increasing. Biodegradable ester represent possible alternative conventional, mineral oil-based lubricants. In addition compatibility requi...

A wheel/rail friction coefficient that is too low can result in damage to the wheel and rail due slips slides, delays safety concerns. high excessive wear, noise rolling contact fatigue. Changing environmental conditions cause variations friction, so management products, applied via wayside or on-board applicators, are used either increase decrease an improved level reached. They be split into ...

Slips and falls are among the most serious public safety hazards. Adequate friction at shoe–floor contact is necessary to reduce these risks. In presence of slippery fluids such as water or oil, footwear outsole crucial for ensuring appropriate traction. While influence flooring contaminants on traction has been extensively studied across several surfaces, limited studies have investigated scie...

In this article, we address the problem of motion planning and control at limits handling, under locally varying traction conditions. We propose a novel solution method where variations over prediction horizon are represented by time-varying tire force constraints, derived from predictive friction estimate. A constrained finite time optimal (CFTOC) is solved in receding fashion, imposing these ...

In this paper, we discuss the question of finding an optimal control for solutions problem with dry friction quasistatic contact, in case that law is modeled by a nonlocal version Coulomb’s law. order to get necessary optimality conditions, use some regularization techniques, and leads us inequality variational type. The consists, our case, minimizing sequence problems, where variable given Neu...

Bearings operating in ultra-low-temperature environments are commonly lubricated with solid lubricants. This study first focused on measuring the traction coefficients of molybdenum disulfide (MoS2) lubricant under various working conditions. Based this data, friction power consumption bearings was calculated and analyzed using a dynamic model. Additionally, experimental verification bearing ul...

This paper discusses the development of an optimal wheel torque controller for a compliant modular robot. The wheel actuators are the only actively controllable elements in this robot. For this type of robots, wheel-slip could offer a lot of hindrance while traversing on uneven terrains. Therefore, an effective wheel-torque controller is desired that will also improve the wheel-odometry and min...

The article reports that to improve the functional characteristics of friction drive vertical spindles, it was proposed replace its conventional V-belts with poly-V-belts. Therefore, rollers changed parameters are installed on spindles while maintaining magnitude rolling radius serial rollers. To determine functionality new drive, a stand single spindle drum created, which allows you all perfor...