Squeeze Film in a Ferrofluid Lubricated Rough Conical Plates: Comparison of Porous Structures

2019 ◽  
pp. 235-248
Author(s):  
R. M. Patel ◽  
Gunamani Deheri ◽  
Pragna A. Vadher
Keyword(s):  
Squeeze Film ◽  
Porous Structures

Ball bearing turbocharger vibration management: application on high speed balancer

2020 ◽  
Vol 21 (6) ◽  
pp. 619
Author(s):  
Kostandin Gjika ◽  
Antoine Costeux ◽  
Gerry LaRue ◽  
John Wilson
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Ball Bearing ◽  
Squeeze Film ◽  
Design And Technology ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
Bearing Loads ◽  
Stiffness And Damping

Today's modern internal combustion engines are increasingly focused on downsizing, high fuel efficiency and low emissions, which requires appropriate design and technology of turbocharger bearing systems. Automotive turbochargers operate faster and with strong engine excitation; vibration management is becoming a challenge and manufacturers are increasingly focusing on the design of low vibration and high-performance balancing technology. This paper discusses the synchronous vibration management of the ball bearing cartridge turbocharger on high-speed balancer and it is a continuation of papers [1–3]. In a first step, the synchronous rotordynamics behavior is identified. A prediction code is developed to calculate the static and dynamic performance of “ball bearing cartridge-squeeze film damper”. The dynamic behavior of balls is modeled by a spring with stiffness calculated from Tedric Harris formulas and the damping is considered null. The squeeze film damper model is derived from the Osborne Reynolds equation for incompressible and synchronous fluid loading; the stiffness and damping coefficients are calculated assuming that the bearing is infinitely short, and the oil film pressure is modeled as a cavitated π film model. The stiffness and damping coefficients are integrated on a rotordynamics code and the bearing loads are calculated by converging with the bearing eccentricity ratio. In a second step, a finite element structural dynamics model is built for the system “turbocharger housing-high speed balancer fixture” and validated by experimental frequency response functions. In the last step, the rotating dynamic bearing loads on the squeeze film damper are coupled with transfer functions and the vibration on the housings is predicted. The vibration response under single and multi-plane unbalances correlates very well with test data from turbocharger unbalance masters. The prediction model allows a thorough understanding of ball bearing turbocharger vibration on a high speed balancer, thus optimizing the dynamic behavior of the “turbocharger-high speed balancer” structural system for better rotordynamics performance identification and selection of the appropriate balancing process at the development stage of the turbocharger.

Interconnectivity of Bioceramic Scaffolds with Different Porous Structures and Their Fluid Velocity Distribution Analyzed by Micro-CT Computer Modeling

2015 ◽  
Vol 30 (1) ◽  
pp. 71 ◽  
Author(s):  
LUO Pin-Feng ◽  
ZHI Wei ◽  
ZHANG Jing-Wei ◽  
SHI Feng ◽  
DUAN Ke ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Computer Modeling ◽  
Fluid Velocity ◽  
Porous Structures ◽  
Micro Ct

MICROSCALE TWO PHASE HEAT TRANSFER ENHANCEMENT IN POROUS STRUCTURES

Equipment ◽  
2006 ◽  
Author(s):  
Leonid L. Vasiliev ◽  
A. Zhuravlyov ◽  
A. Shapovalov ◽  
L. L. Vasiliev, Jr
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Porous Structures ◽  
Transfer Enhancement ◽  
Two Phase ◽  
Two Phase Heat Transfer

Heat transfer in the irregular porous structures

2002 ◽  
Author(s):  
Boris M. Galitseisky
Keyword(s):  
Heat Transfer ◽  
Porous Structures

Experimental Investigation of the Hydrocarbons Pool Boiling on Porous Structures

2002 ◽  
Author(s):  
Leonard L. Vasiliev ◽  
Alexander S. Zhuravlyov ◽  
Mikhail N. Novikov ◽  
A.V. Ovsianik ◽  
Leonid L. Vasiliev, Jr.
Keyword(s):  
Experimental Investigation ◽  
Pool Boiling ◽  
Porous Structures
Sign in / Sign up

Export Citation Format

Share Document