This work describes in details the steps involved within the mathematical modelling of multibody systems (rigid and flexible) interconnected via controllable thin fluid films. The dynamics of the mechanical components are described with help of multibody dynamics and finite element method. In this paper, the methodology is applied to reciprocating machines such as hermetic reciprocating compressors and internal combustion engines. In previous studies [1], it has been shown that for a light duty vehicle, the friction losses may reach until 48% of the total energy consumption of an engine and from that, almost 30% are coming from bearings and crankshaft. Therefore, considering that the dynamics of the fluid films in the journal bearings can be actively controlled by means of different types of actuators, allowing significant reduction of wear and vibrations, one of the aims of this paper is to study the feasibility of applying active lubrication to the main journal bearings of reciprocating machines. In this framework the paper gives a theoretical contribution to the combined fields of fluid-structure interaction and active vibration control. The hydrodynamic pressure distribution for an active lubricated finite journal bearing dynamically loaded can be calculated by numerically solving the modified Reynold’s equation [2], by means of finite-difference method and integrated over the pressure area in order to obtain the dynamic reaction forces among components. These forces are strongly nonlinear and dependent on the relative kinematics of the system. From the point of view of active lubrication and specifically considered the case of a dynamically loaded journal bearing, the injection pressure should be controlled in the time domain. However, taking into account that the pressures and reaction forces in a reciprocating machine have a cyclic behaviour, the fluid film thickness of the main bearings may be modified by controlling the oil pressure injection, depending on the crank angle and the load bearing condition. It can be mentioned that the pressure and flow may be controlled by mechanical cam systems, piezoelectric nozzles [3] [4] or servovalves [5] [6], therefore, an adequate control strategy has to be defined. The fluid film forces are coupled to the set of nonlinear equations that describes the dynamics of the mechanical system. Such a set of equations is numerically solved giving some insights into the following parameters: a) maximum fluid film pressure, b) minimum fluid film thickness, c) maximum vibration levels and d) viscous frictional forces. The behaviour of such parameters is investigated when the system operate with conventional hydro-dynamic lubrication, passive hybrid lubrication and controlled hybrid lubrication.
Skip Nav Destination
STLE/ASME 2008 International Joint Tribology Conference
October 20–22, 2008
Miami, Florida, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-4336-9
PROCEEDINGS PAPER
Linking Rigid and Flexible Multibody Systems via Thin Fluid Films Actively Controlled Available to Purchase
Edgar A. Estupinan,
Edgar A. Estupinan
Technical University of Denmark, Lyngby, Denmark
Search for other works by this author on:
Ilmar F. Santos
Ilmar F. Santos
Technical University of Denmark, Lyngby, Denmark
Search for other works by this author on:
Edgar A. Estupinan
Technical University of Denmark, Lyngby, Denmark
Ilmar F. Santos
Technical University of Denmark, Lyngby, Denmark
Paper No:
IJTC2008-71177, pp. 367-369; 3 pages
Published Online:
June 5, 2009
Citation
Estupinan, EA, & Santos, IF. "Linking Rigid and Flexible Multibody Systems via Thin Fluid Films Actively Controlled." Proceedings of the STLE/ASME 2008 International Joint Tribology Conference. STLE/ASME 2008 International Joint Tribology Conference. Miami, Florida, USA. October 20–22, 2008. pp. 367-369. ASME. https://doi.org/10.1115/IJTC2008-71177
Download citation file:
9
Views
Related Proceedings Papers
Related Articles
Fluid–Structure Interaction Lubrication Analysis of Compliant Journal Bearing Lubricated With Non-Newtonian Plastic Fluid
J. Tribol (June,2025)
Controlling the Frequency Content of Inertia Forces in Dwelling Cam-Follower Systems
J. Mech. Des (May,2007)
Transient Analysis of the Textured Journal Bearing Operating With the Piezoviscous and Shear-Thinning Fluids
J. Tribol (September,2017)
Related Chapters
Introduction I: Role of Engineering Science
Fundamentals of heat Engines: Reciprocating and Gas Turbine Internal Combustion Engines
Accuracy of an Axis
Mechanics of Accuracy in Engineering Design of Machines and Robots Volume I: Nominal Functioning and Geometric Accuracy
Hydrodynamic Lubrication
Design of Mechanical Bearings in Cardiac Assist Devices