Newsletter. Aug.2012 CONTENTS ACTIVE SPONSORS RESEARCH SCOPE AND OBJECTIVE CURRENT RESEARCH & DEVELOPMENT ACTIVITIES

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1 Newsletter Aug.2012 CONTENTS ACTIVE SPONSORS Research Scope and Objective Current Research & Development Activities 2012 Publications Graduate Student Profiles Upcoming HGSim Functionalities Contact Information Caterpillar Dana John Deere Meritor RESEARCH SCOPE AND OBJECTIVE Chrysler Ford Linamar Romax To develop gear mesh representations that will enable dynamic models to be formulated for simulating the vibration response of the driveline systems. To perform studies of the modal and dynamic characteristics controlling mesh force generation, vibration transmissibility, and gear whine. To develop an integrated gear mesh and dynamic modeling and analysis software package. To apply the software package for design, analysis and trouble-shooting. To develop a design roadmap for durable, quiet driveline structures. CURRENT RESEARCH & DEVELOPMENT ACTIVITIES Applying multi-point mesh model to simulate the nonlinear dynamic response of driveline systems Studying the effect of both drive and coast conditions on mesh parameters and nonlinear dynamics Predicting the dynamic mesh stiffness of hypoid and bevel gears under operating conditions Analyzing the effect of impact damping on gear tooth clashing response Upcoming consortium meeting on August 13, 2012 at Ohio State Univ., Columbus, Ohio. Spring consortium meeting on March 11, / 5

2 2012 PUBLICATIONS 1. X. Hua, T.C. Lim, T. Peng, W. Elwali, Dynamic Analysis of Spiral Bevel Geared Rotor Systems Applying Finite Elements and Enhanced Lumped Parameters, International Journal of Automotive Technology, 13(1), pp , 2012, doi: /s C. Song, C. Zhu, T.C. Lim, J. Luo, X. Xu, Time-varying Mesh Characteristics of Beveloid Gears with Crossed Axes and Small Shaft Angle, Journal of Vibration and Shock, 31(8), pp , C. Zhu, C. Song, T.C. Lim, S. Vijayakar, Geometry Design and Tooth Contact Analysis of Crossed Beveloid Gears for Marine Transmissions, Chinese Journal of Mechanical Engineering, 25(2), pp , 2012, doi: /CJME J. Liu, Y. Shao, T.C. Lim, Vibration Analysis of Ball Bearings with Localized Defect Applying Piecewise Response Function, Mechanism and Machine Theory, 56, pp , G. Pietila, T.C. Lim, Intelligent Systems Approaches to Product Sound Quality Evaluations A Review, Applied Acoustics, 73, pp , 2012, doi: /j.apacoust GRADUATE STUDENT PROFILES Junyi Yang (PhD, graduated in 2012 Spring) joined the University of Cincinnati in August He is presently working for the National Institute of Occupational Safety and Health. Junyi has extensive experience in performing automotive and off-highway vehicle driveline NVH, CAE simulation, noise and vibration measurement, and structure optimization. He has expertise in spiral bevel/hypoid gear design, vibration and acoustics, experimental modal analysis, sound localization methods, FEM, BEM, TPA, sub-structure technique, nonlinear dynamics, rotational system dynamics, signal processing and control. junyi_seu@hotmail.com Yawen Wang (2 nd year PhD) was a research assistant in the State Key Lab of Mechanical Transmission at Chongqing University prior to joining the Hypoid and Bevel Gear Mesh and Dynamics Consortium research team at the University of Cincinnati. He has experience in CAE simulation, FEM, gear vibrations and gear noise, and hypoid and bevel gear mesh and dynamic modeling. His current research focuses on coupled multi-body dynamics and vibration of geared rotor systems. He is presently the lead developer for HGSim. wang2y4@mail.uc.edu Zhenghong Shi (1 st year PhD) received his master s degree this past summer with micro linear piezoelectric actuators as his thesis research topic. With extensive knowledge in mechanical vibrations, system dynamics, acoustics, FEM, CAD/CAE simulation, he is now performing pioneering gear studies as a member of the Hypoid and Bevel Gear Mesh and Dynamics Consortium research team at the University of Cincinnati. His current research focuses include tooth impact effect on gear dynamics, vehicle driveline NVH, and non-linear modal analysis. shizg@mail.uc.edu Srikumar Gopalakrishnan (1 st year PhD) worked as a finite element analyst for four years on static linear and nonlinear structural analysis and thermo-structural problems prior to joining the Hypoid and Bevel Gear Mesh and Dynamics Consortium research team at the University of Cincinnati in Currently, he is working on gear dynamics and gear noise for his dissertation research. srikumar.gopalakrishnan@gmail.com 2 / 5

3 DMF (N) UPCOMING HGSIM FUNCTIONALITIES Multi-point mesh analysis applying coupled dynamic and vibration nonlinear time-varying (NLTV) 14- DOF model. Shown below is a response plot of dynamic mesh force (DMF) versus frequency (Hz). Mesh model setting Mesh Point 1 Mesh Point 2 Mesh Point 3 Result 10 3 Dynamic setting Frequency (Hz) Multi-point mesh parameters can be exported in the form of Nastran bulk data format. a) Single-point mesh model (above) Options 3 / 5 b) Multi-point mesh model

4 Mesh Force (N) Dynamic Mesh Force (N) Acceleration (m/s 2 ) Housing modal model is added to linear time-invariant (LTI) 14-DOF model as shown below No coupling Partial coupling Mesh Frequency (Hz) a)dynamic Mesh Force comparison Mesh Frequency (Hz) b)housing Surface Accerleration Mesh parameters of each time step can be used to compute a series of LTI responses given below. This function is available for linear time-invariant (LTI) 14-DOF model Frequency (Hz) 4 / 5

5 Zm ( mm ) Ym ( mm ) Xm ( mm ) More load dependent results are included in mesh calculation as shown below. Post-processor setting Mesh Point Line of Action Load dependent mesh point (b) Mesh Point n x n y n z Load dependent line of action (a) Line of Action CONTACT INFORMATION Teik C. Lim PhD, PE, Fellow (ASME,SAE) Director, Hypoid and Bevel Gear Mesh & Dynamics Consortium Interim Dean, College of Engineering and Applied Science Herman Schneider Professor of Mechanical Engineering College of Engineering and Applied Science 801 Engineering Research Center (ERC) P.O. Box University of Cincinnati Cincinnati, Ohio , USA teik.lim@uc.edu Phone: / 5