Institute of Dynamics and Vibrations Field of Expertise, Tribology

Size: px

Start display at page:

Download "Institute of Dynamics and Vibrations Field of Expertise, Tribology"

Melanie Fletcher
6 years ago
Views:

1 Platzhalter für Bild, Bild auf Titelfolie hinter das Logo einsetzen Institute of Dynamics and Vibrations Field of Expertise, Tribology Prof. Dr.-Ing. habil. G.-P. Ostermeyer

Our Approach to Solving Your Problems We consider and investigate friction as a highly dynamic process, which is effected by a plethora of influencing factors, in particular, the load history of the

We set out to use modern theories towards developing new insights into the elementary mechanisms of friction and towards the exacter understanding and description of the dissipation processes

Theory Using standard methods as well as our own innovative simulation techniques, we are able to simulate friction effects, and perform virtual investigations on the dependencies of friction pairs

2 Our Approach to Solving Your Problems We consider and investigate friction as a highly dynamic process, which is effected by a plethora of influencing factors, in particular, the load history of the friction partners. We set out to use modern theories towards developing new insights into the elementary mechanisms of friction and towards the exacter understanding and description of the dissipation processes between two friction bodies. Theory Using standard methods as well as our own innovative simulation techniques, we are able to simulate friction effects, and perform virtual investigations on the dependencies of friction pairs N v rel F With the aid of extensive measurement device facilities, we are able to perform laboratory scale analysis and characterization of tribological systems from various technical fields Simulation Measurement We are always focused on keeping these three fields closely connected. We are equally equipped to investigate tribological systems, regardless of whether their aim is to maximize friction (ex. brakes), reduce friction (ex. bearings) or maximize wear (ex. sanding). Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 2

Field of Expertise, Tribology: Theory One of our strengths is the use of new theoretical approaches towards describing both the events that take place in the friction boundary layer between two

3 Field of Expertise, Tribology: Theory One of our strengths is the use of new theoretical approaches towards describing both the events that take place in the friction boundary layer between two bodies, and friction induced vibrations. Towards these goals, we view friction as a generalized interdisciplinary multi-scale problem. For all of our theoretical research, we have direct and convenient access to a wealth of literature (TU Braunschweig s Library, Online Publication Databases, etc.) s n s n s n Surface topography dynamics of a typical brake pad (Creation and destruction of hard Patches ) µ Friction Restleistung Power Elastic elastische Deformation Plastic plastische Deformation Deformation Brake Bremssattel Caliper Brake Reibbelag Pad Contact Kontaktplateaus Plateaus Thermal Wärme Energy Brake Bremsscheibe Disc Interpretation of µ as related to power v rel Mechanically analogous model towards the description of friction induced vibrations Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 3

Field of Expertise, Tribology: Measurement Our tribometers enable us to analyze various types of friction systems under precisely defined ambient conditions.

4 Field of Expertise, Tribology: Measurement Our tribometers enable us to analyze various types of friction systems under precisely defined ambient conditions. Tests with these devices can also be seamlessly combined with optical investigations, for example, between friction applications. Automated Universal Tribotester: Pin-on-Disc Design Rotation speeds up to 1500 RPM (approx. 160 km/h equivalent driving speed) Normal forces up to 300 N (approx. 45 bar equivalent brake line pressure) Normal force modulation Acoustic investigations Optical measurements of the brake pad surface and wear of the disc High Load Tribometer: Pin-on-Disc and Block-on-Ring Design Circular friction path Driving power up to 12 kw Temperature control of the friction contact up to 300 C Wetting with conditioned media Relative velocities up to 60 m/s Normal forces up to 1000 N Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 4

Field of Expertise, Tribology: Measurement We perform precise

surfaces, measuring, for example, the thickness loss of a

With our vibration measurement instrumentation, we are also

Stereoscopic microscope and 3D optical depiction of a typical

for quantitative topographical measurements Wear measurement

5 Field of Expertise, Tribology: Measurement We perform precise investigations of the structure and topography of friction surfaces, measuring, for example, the thickness loss of a sample due to wear. With our vibration measurement instrumentation, we are also capable of measuring friction induced vibrations. Stereoscopic microscope and 3D optical depiction of a typical brake pad White-light interferometer and confocal microscope for quantitative topographical measurements Wear measurement through optical detection of thickness loss of the sample Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 5

Surface deformation Structure Coefficient of Friction Temperature in

effects, we employ various technologies catered to the size scale of

Along with using standard software, we develop and employ an ever

cellular automata and mesoscopic multi-particle systems.

friction surface Friction dependent temperature in a heterogeneous

6 Surface deformation Structure Coefficient of Friction Temperature in C Field of Expertise, Tribology: Simulation To simulate friction effects, we employ various technologies catered to the size scale of the problem. Along with using standard software, we develop and employ an ever increasing number of customized tools, ex. cellular automata and mesoscopic multi-particle systems. Cellular automata simulation of the topography dynamics of a friction surface Friction dependent temperature in a heterogeneous material model Braking Nr. Virtual figure of industrial test procedures with innovative friction laws Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 6

7 Our Offer to You Measurement Work Orders: Do you need coefficient of friction and wear data for specific material pairings? Are you interested in particular friction parameters under defined laboratory conditions? We are pleased to offer you a consultation and to cooperatively develop a test concept to represent your desired tribological system using our measurement devices. We will then make use of this to solve your problem statement with scientific rigor. Short-Term Projects: Do you need short-term support on a well-defined problem, e.g., from an ongoing development project? We have the methodical expertise and equipment needed to solve your problem by means of theory, simulation, and/or measurement. Research Projects: Are you interested in a long-term collaboration to tackle a challenging scientific problem? We are pleased to define an individually-tailored project plan together with you. In this mode of collaboration, a scientist from our institute works full-time on the defined problem for at least one year. He or she has full access to the experience and equipment of our team and, optionally, works with your team on-site for reasonable periods of time. We would be pleased to prepare an individual quote based on your request. Prof. Dr.-Ing. habil. G.-P. Ostermeyer Field of Expertise, Tribology Page 7

Ostermeyer TU Braunschweig Institut für Dynamik und Schwingungen Schleinitzstraße

8 Platzhalter für Bild, Bild auf Titelfolie hinter das Logo einsetzen Your Contact Person: Prof. Dr.-Ing. habil. G.-P. Ostermeyer TU Braunschweig Institut für Dynamik und Schwingungen Schleinitzstraße 20 D Braunschweig Tel. +49 (0) Fax +49 (0)

HTS Cable Integration into Rural Networks with Renewable Energy Resources

Platzhalter für Bild, Bild auf Titelfolie hinter das Logo einsetzen HTS Cable Integration into Rural Networks with Renewable Energy Resources Dr.-Ing. Nasser Hemdan Outline Introduction Objectives Network