Tero- Technology and Tribology Maintenance Management
Jun 14, 2015
Tero-Technology
and TribologyMaintenance Management
Tero TechnologyMaintenance Management
Introduction
Terotechnology is a kind of applied science for measuring the operational values of physical assets.
It is concerned with things such as the installation, maintenance and replacement of those assets.
Professionals who are involved in terotechnology look at tangible assets of a company or business such as buildings, equipment and vehicles.
They measure how these items will provide a net value for certain years until they need to be replaced.
Life-Cycle CostingPart of terotechnology is called life-cycle costing.
Life-cycle costing can include attention to depreciation and other tax-related values.
Generally, in life-cycle costing, one adds up all of the positive and negative values associated with a physical asset during a certain period of time to produce a net result.
Companies use this net value to understand how ownership and use of a piece of equipment or other physical asset during that period of time will affect their bottom line.
The Life Cycle Cost Analysis
Life Cycle Cost
Analysis
Service Costs
Preventive Maintenance Costs
Operating Costs
Disposal Costs
Initial Cost
The Life Cycle Cost Curve
Relation with Maintenance
A big part of terotechnology is in
understanding the role of maintenance and
the value of a warranty.
Many larger pieces of equipment and other physical assets come
with warranties offered by the
manufacturer or vendor.
In terotechnology, the way in which these warranties provide
value relative to projected costs is
examined.
The Bath-Tub Curve
A bath-tub curve is used to indicate the failure rate for equipment or machines.
In the beginning of its life cycle, an item might be relatively likely to fail for various reasons, such as manufacturing or installation errors.
After becoming acclimated to its environment, the item will be less likely to fail until wear and age make the failure rate start to increase again.
The shape of this projected failure rate when plotted on a graph resembles a bath tub, which is the reason for its name.
The Bath Tub Curve
Tero TechnologyTerotechnology represents a differentiation between all
of the physical assets that a business owns and other assets that are intangible and not associated with
operating costs.
Typically, businesses hold certain physical assets for production and focus their additional capital on the kinds of intangible assets that don’t generate more
overhead costs.
The science of evaluating physical items is, for many
companies, a way to manage the inevitable and
necessary ownership of physical equipment.
Tero Technology
Vendors’ Use
Vendors also apply terotechnology to their products.
These are the same products that will become assets for buyers, so vendors also can benefit from the same observational science to know more about the value of their products in the hands of others.
Overall, this kind of analysis is a way for businesses to keep tabs on the expenses involved in owning large machines or other gear, as well as office space and other physical parts of their business.
TribologyMaintenance Management
Introduction
Tribology is the science and engineering of interacting surfaces in relative motion.
It includes the study and application of the principles of friction, lubrication and wear.
Tribology is a branch of mechanical engineering and materials science.
Etymology
The word tribology derives from the Greek root τριβ- of the verb τρίβω, tribo, "I rub" in classic Greek; and the suffix -logy from -λογία, -logia "study of", "knowledge of".
It was coined by the British physicist David Tabor, and also by Peter Jost in 1964, a lubrication expert who noticed the problems with increasing friction on machines, and started the new discipline of tribology.
Applications and FieldsTribology
Individual Components
Assemblies or Products
Manufacturing Processes
Construction/Exploration
Natural Phenomena
FundamentalsThe tribological interactions of a solid surface's exposed face with interfacing materials and environment may result in loss of material from the surface.
The process leading to loss of material is known as "wear". Major types of wear include abrasion, friction (adhesion and cohesion), erosion, and corrosion.
Wear can be minimized by modifying the surface properties of solids by one or more of "surface engineering" processes (also called surface finishing) or by use of lubricants (for frictional or adhesive wear).
Fundamentals
FundamentalsEstimated direct and consequential annual loss to industries in the USA due to wear is approximately 1-2% of GDP. (Heinz, 1987).
Engineered surfaces extend the working life of both original and recycled and resurfaced equipment, thus saving large sums of money and leading to conservation of material, energy and the environment.
Methodologies to minimize wear include systematic approaches to diagnose the wear and to prescribe appropriate solutions.
Important MethodsPoint like contact
theory was established by
Heinrich Hertz in 1880s.
Fluid lubrication dynamics was
established by Arnold Johannes Sommerfeld
in 1900s.
Important MethodsTerotechnology, where
multidisciplinary engineering and management techniques are used
to protect equipment and machinery from degradation
(Peter Jost, 1972)
Horst Czichos's systems approach, where appropriate
material is selected by checking properties against tribological requirements under operating environment (H. Czichos,1978)
Important MethodsAsset Management by Material Prognosis - a concept similar to terotechnology which has been
introduced by the US Military (DARPA) for upkeep of equipment in good health and start-ready condition for 24 hours.
Good health monitoring systems combined with appropriate remedies at maintenance and repair stages have led to improved performance, reliability and extended life cycle of the assets, such as
advanced military hardware and civil aircraft.
Fundamentals
• 1. Solid/boundary friction• 2. Mixed friction• 3. Fluid friction
• on the basis of the “Stribeck curve”. These curves clearly show the minimum value of friction as the demarcation between full fluid-film lubrication and some solid asperity interactions.
Friction regimes for
sliding lubricated surfaces
have been broadly
categorized into:
Fundamentals
Stribeck and others systematically studied the
variation of friction between two liquid
lubricated surfaces as a function of a dimensionless
lubrication parameter
ηN/P,
where η is the dynamic viscosity, N the speed (e.g. revolutions per minute of a
bearing) and P the load projected on to the geometrical
surface.
Stibeck Curve
New Areas of Tribology
Since the 1990s, new areas of tribology have emerged,
including the nanotribology, biotribology, and green tribology.
These interdisciplinary areas study the friction, wear and lubrication at the nanoscale, in biomedical applications
(e.g., human joint prosthetics, dental
materials), and ecological aspects of friction,
lubrication and wear.
Harsh ThagelaHimanshu Ahlawat
Pulkit Sharma
DFT - VI
Thank You!