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Journal Bearings

Journal Bearings

Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...

Bearings: Problem Solving

Bearings: Problem Solving

Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...

Pivot Bearings

Pivot Bearings

In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...

Types of Friction Problems

Types of Friction Problems

Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion.

Dry Friction

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...

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Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Published on: September 28, 2015

Tribology.

Nicholas D Spencer¹

¹Laboratory for Surface Science and Technology, Wolfgang-Pauli-Strasse 10, ETH Zurich, 8093 Zurich, Switzerland. nspencer@ethz.ch

Faraday Discussions

|January 5, 2013

Summary

This summary is machine-generated.

This Faraday Discussion explored tribology, covering biotribology, predictive modeling, smart surfaces, and advanced lubrication. It integrated insights from biology, chemistry, physics, materials science, and engineering.

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Area of Science:

Tribology
Interdisciplinary Science

Background:

The 156th Faraday Discussion convened experts to address the multifaceted field of tribology.
Key areas of focus included biotribology, predictive modeling, smart surfaces, and future lubricated systems.

Framework:

The discussion integrated principles from biology, medicine, chemistry, physics, materials science, and mechanical engineering.
This multidisciplinary approach facilitated a comprehensive examination of tribological challenges.

Implementation:

Papers presented showcased innovative research across various tribological subdomains.
The event fostered a collaborative environment for sharing cutting-edge advancements.

Implications:

Provided a challenging and fascinating insight into the current state of tribology.
Highlighted future research directions and potential applications in diverse scientific and engineering fields.