Waukesha Bearings to Present at ASME Turbo Expo Virtual Conference

“Experimental Investigation and Numerical Modelling of a Large Heavily-Loaded Tilting Pad Journal Bearing With Polymer Lined Pads”


  • Filippo Cangioli, Waukesha Bearings (Presenting Author)
  • Richard Livermore-Hardy, Waukesha Bearings
  • Guy Pethybridge, Waukesha Bearings
  • Uemit Mermertas, Siemens Gas and Power GmbH & Co. KG
  • Michael Stottrop, Ruhr-Universitat Bochum
  • Beate Bender, Ruhr-Universitat Bochum

Presentation Schedule

Session 25-01
Start time: September 22, 2020, 10:15 am


A large tilting pad journal (TPJ) bearing with “PEEK” polymer-lined pads was tested over a range of operating conditions representative of those experienced on turbo-generators used in fossil fuel power plants. The 500 mm diameter test bearing has four offset pivot pads, ball and socket pivots, load between pivot configuration, ‘Directed Lubrication’ and hydrostatic jacking features. The operating conditions explored during the test campaign characterize the static and dynamic behavior of the bearing over a range of shaft surface speeds between 40 m/s and 95 m/s and maximum specific load of 4.75 MPa. Similar test conditions were previously investigated on the same bearing with whitemetal lined pads, allowing for a direct comparison.

A thermo-elasto-hydrodynamic (TEHD) model for TPJ bearings with polymer-lined pads is introduced in this paper and validated against experimental test data.

Experimental data along with numerical results reveal and confirm the superior performance that can be attained using TPJ bearings with polymer-lined pads at high specific loads.

Read more about the paper on the ASME Turbo Expo site

Conference Registration

ASME Turbo Expo Virtual Conference registration details can be found online at the ASME website

Virtual event content will be available on-demand approximately one week prior to, during and after the virtual event conference dates.

Waukesha Bearings Co-authors Paper with Ansaldo Energia for 62nd ASME Turbo Expo

“A System Integration Approach for Heavy-Duty Gas Turbine Upgrades Using Improved Rotor Thrust Predictions and Application of Advanced Thrust Bearing Designs,” a joint paper by Ansaldo Energia and Waukesha Bearings, will be presented at the ASME Turbo Expo in Charlotte, North Carolina, Wednesday, June 28 at 8 am (Session 15-1, in room 207D).


Francesco Bavassano, Ansaldo Energia; Marco Mantero, Ansaldo Energia; Riccardo Traverso, Ansaldo Energia; Richard Livermore-Hardy, Waukesha Bearings; Barry Blair, Waukesha Bearings


The progressive upgrading of heavy-duty gas turbines, aimed at increased performance, can ultimately introduce more onerous operating conditions, to the point that original design limits can be approached.

An increased gas turbine pressure ratio together with compression and expansion line adjustments can directly affect the rotor axial thrust. Other than the individual forces acting on the rotor, a key component to be taken into account is the fluid film thrust bearing, which should assure safe and reliable operation during the worst case operating conditions.

Typically, such bearings are designed with large safety margins, yet it is possible that the new and more challenging conditions require a bearing capability upgrade, especially when field retrofit needs pose additional constraints.

A succession of performance upgrades have been carried out on Ansaldo Energia’s AE94.2 E-Class GT. An accurate understanding of the thrust-related phenomena proved necessary and drove improvements in the thrust bearing design along with hardware adjustments to lower the rotor thrust.

This paper addresses calculations and experimental arrangements for the rotor axial thrust evaluation on the aforementioned GT and considers both the matters related to the secondary air system for the thrust generation and the mechanical/functional matters for the bearing upgrade. It is shown that issues such as uneven load sharing across the thrust bearing, or the variability of rotor thrust from engine to engine within the fleet, strongly affect the maximum thrust assessment and thus the requirements used in the process of selecting a suitable bearing.

A predictive calculation method is described considering the main thrust contributions. Field experimental setups and main observations are reported. Measurements have been carried out using thermocouples and load cells placed on many of the thrust bearing pads. Moreover, the engine cavities carrying the highest and/or the most uncertain thrust share have been instrumented and characterized by pressure sensors.

The development of an upgraded thrust bearing is finally depicted through the main issues addressed, such as improved thrust pad lining material, increased load sharing efficiency and enlarged thrust bearing active surface area. Waukesha Bearings test results on the upgraded lining material, a high-tin aluminium alloy, are reported as well.

A multidisciplinary approach is presented as necessary to manage the crucial challenge of improving the thrust balancing system, especially in the case of a formerly designed engine which receives a powerful upgrade.

Waukesha Magnetic Bearings to Present at MaintCon 2014 in Bahrain

Waukesha Magnetic Bearings, an industry leader in custom-engineered magnetic bearing systems for large turbomachinery and high-performing rotating equipment, is proud to announce that Chief Engineer Richard R. Shultz will be delivering a presentation at the third biennial Middle East Maintenance Conference & Exhibition (MaintCon), Dec. 7-10, 2014, in Bahrain. The presentation, which is co-authored by Mamdouh B. Al-Aidarous, Saudi Aramco, PE Mechanical, with Rotating Equipment & Dynamic Analysis (REDA), will focus on Bearing System Reliability and Availability, including consideration of a magnetic bearing system for an enhanced oil recovery (EOR) motor compressor.

“MaintCon 2014 in Bahrain is a tremendous opportunity to discuss the newest technologies from around the globe, and we are excited that Richard Shultz will be sharing the unique benefits of magnetic bearing systems with attendees this year,” said Jay A. Burnette, President of Waukesha Bearings Corporation™.

Shultz’s presentation will examine the design of canned magnetic bearings in a hermetically sealed motor compressor. The canning, a highly corrosion-resistant metallic lining, allows the bearings to operate directly immersed in the process gas. With the elimination of the need for shaft seals, the system’s reliability is increased, and no maintenance is required for the magnetic bearings. Specific attention will be paid to the benefits of the condition monitoring capabilities within the magnetic bearing system.

View more information about Waukesha Magnetic Bearings

Shultz is the Chief Engineer for bearing systems at Waukesha Magnetic Bearings. He has 20 years of industrial experience designing magnetic bearing systems and auxiliary bearing systems, specializing in rotordynamics and control system design. He has recently instructed at the Magnetic Bearing Short Course at Texas A&M University’s Turbomachinery Symposium and the Middle East Turbomachinery Symposium in Qatar.

In conjunction with the presentation, all of Waukesha Bearings Corporation’s operating companies, including Waukesha Magnetic Bearings, Waukesha Bearings®, Inpro/Seal® and BearingsPlus™, will be exhibiting at the event with local partner Eastern MSAR at booth B06 and B08. Attendees are invited to talk with representatives about all the Waukesha product lines, including hydrodynamic bearings, magnetic bearings, brush seals and engineered sealing solutions.

Waukesha Magnetic Bearings General Manager to Deliver Keynote at ISMB14

Waukesha Magnetic Bearings®, a Waukesha Bearings business and an industry leader in custom engineered magnetic bearing systems for large turbomachinery and high-performing rotating equipment, is proud to announce Mike Swann, General Manager, will be delivering a keynote address at the 14th International Symposium on Magnetic Bearings (ISMB14) August 11-14 in Linz, Austria. The keynote address is titled “Industrialisation Trends for Active Magnetic Bearings in the Turbomachinery Industry.”

“We are very pleased to have one of the recognized leaders in industrial applications of magnetic bearings, Waukesha Magnetic Bearings, provide a keynote address at ISMB14 (14th International Symposium on Magnetic Bearings) about their view of continuing industrialization trends and what that means for the future of this technology of worldwide interest. Mike Swann, General Manager of Waukesha Magnetic Bearings and recipient of a Lifetime Achievement Award at ISMB13, will be presenting this talk,” said Prof. Wolfgang Amrhein, Chair of ISMB14.

In his keynote address, Swann will focus on the increasing adoption rate of active magnetic bearings in the turbomachinery industry and how leading magnetic bearing suppliers have been exceeding customer expectations. In turbomachinery applications for oil & gas and power generation, this has meant the globalization of sales and service activities as well as key project engineering, product development and manufacturing functions. Swann’s keynote will examine the history of these trends and what one supplier sees as the future of this industry.

View more information about Waukesha Magnetic Bearings

In addition to Swann’s keynote address, Waukesha Magnetic Bearings Engineering Manager, Richard Jayawant, will present a paper titled “Numerical and Experimental Results of Auxiliary Bearings Testing on a High Speed Test Rig.” Waukesha Magnetic Bearings will be exhibiting in the central exhibition area throughout the four-day event.

ISFD Paper Presented at ASME Turbo Expo

Waukesha Bearings, a global leader in the design and manufacture of oil- and process-lubricated engineered bearings, is proud to offer the presentation of the integral squeeze film damper (ISFD) 8 – 10 a.m. June 19, at the American Society of Mechanical Engineers (ASME) Turbo Expo in Düsseldorf, Germany.

The presentation is based on a paper that presents experimental tests and analytical results focused on stabilizing a 46 MW 6,230kg utility steam turbine experiencing subsynchronous rotordynamic instability. The paper, coauthored by Dr. Jong Kim, Sr. Principal Engineer of Waukesha Bearings, and several other ASME colleagues, advances an integral squeeze film damper (ISFD) solution which was implemented to resolve the subsynchronous vibration and allow full-load and full-speed operation of the machine.

View more information about the ISFD bearing system 

Dr. Jong Kim is Senior Principal Engineer for Waukesha Bearings. Joining KMC/BPI in 2001, he possesses extensive experience in rotordynamic analyses and bearing failure analyses. A former mechanical engineering teacher at Korea Maritime University for 10 years, Dr. Jong Kim received a BS degree (Mechanical Engineering, 1985) from Busan National University, and an MS degree (Mechanical Engineering, 1987) and a PhD (Mechanical Engineering, 1991) from KAIST (Korea Advanced Institute of Science and Technology). He has authored and coauthored several technical papers and holds patents on bearings and dampers.

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