Your Selections

Chen, Jia-Shiun
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Noise Reduction for the Bogie of Mass Rapid Train

National Taipei Univ of Technology-Jia-Shiun Chen, Hsiu-Ying Hwang
Published 2011-04-12 by SAE International in United States
The Taipei Metro is one of the major transportation systems in the Taipei area. Noticeable noise and vibration caught attention during the train turning on a rail with a large angle.The initial investigation indicates the noise occurs between the slewing ring bearing and the friction sets which are located between the body and chassis systems. A study was conducted to identify the root causes. A lab test to duplicate the reported problem observed on the train was established, and a set of experiments were performed in the lab to identify the root causes. Under certain contact conditions, unsmooth turning would occur and cause the noise and vibration.To further identify and understand the root causes. An ADAMS multibody dynamic model which included the slew bearing and friction set was build to perform the train turn motion, and to verify the lab test. Different friction materials were also included in the simulation. The simulation suggested that the vibration can be effectively reduced by ceramic compound friction materials.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Modeling and Simulation of Torsional Vibration of the Compliant Sprocket in Balance Chain Drive Systems

SAE International Journal of Fuels and Lubricants

General Motors Corporation-H.Y. Isaac Du, Xiangming Fang, Jia-Shiun Chen
LMS International-Keith D. Moss, William C. Prescott
  • Journal Article
  • 2008-01-1529
Published 2008-06-23 by SAE International in United States
The work presented in this paper outlines the development of a simulation model to aid in the design and development of a compliant sprocket for balancer drives. A design with dual-mass flywheel and a crank-mounted compliant chain sprocket greatly reduces interior noise levels due to chain meshing. However, experimental observations showed the compliant sprocket can enter into resonance and generate excessive vibration energy during startup. Special features are incorporated into the compliant sprocket design to absorb and dissipate this energy. Additional damper spring rate, high hysteresis and large motion angle that overlap the driving range may solve the problem during engine start-up period.This work develops a simulation model to help interpret the measured data and rank the effectiveness of the design alternatives. A Multibody dynamics system (MBS) model of the balancer chain drive has been developed, validated, and used to investigate the chain noise. This model includes a cranktrain system coupled to a full balancer drive system that includes the chain drive, balance shafts, and water pump. The nonlinear stiffness and damping effects of the…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

An Engineering Method for Part-load Engine Simulation

General Motors Corporation-P. Bertrand Hsing, Jia-Shiun Chen, H.Y. Isaac Du
Published 2007-10-29 by SAE International in United States
This work provides an effective engineering method of building a part-load engine simulation model from a wide-open throttle (WOT) engine model and available dynamometer data. It shows how to perform part-load engine simulation using optimizer for targeted manifold absolute air pressure (MAP) on a basic matrix of engine speed and MAP. Key combustion parameters were estimated to cover the entire part-load region based on affordable assumptions and limitations. Engine rubbing friction and pumping friction were combined to compare against the motoring torque. The emission data from GM dynamometer laboratory were used to compare against engine simulation results after attaching the RLT sensor to record emission data in the engine simulation model.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

NVH Analysis of Balancer Chain Drives with the Compliant Sprocket of the Crankshaft with a Dual-Mass Flywheel for an Inline-4 Engine

General Motors Corporation-H.Y. Isaac Du, Jia-Shiun Chen
LMS International-Keith D. Moss, Joe Zamora
Published 2007-05-15 by SAE International in United States
The work presented in this paper outlines the design and development of a compliant sprocket for balancer drives in an effort to reduce the noise levels related to chain-sprocket meshing. An experimental observation of a severe chain noise around a resonant engine speed with the Dual-Mass Flywheel (DMF) and standard build solid (fixed) balancer drive sprocket. Torsional oscillation at the crankshaft nose at full load is induced by uneven running of crankshaft with a dual-mass flywheel system. This results in an increase of the undesirable impact noise caused by the meshing between the chain-links and the engagement/disengagement regions of sprockets, and the clatter noise from the interaction between the vibrating chain and the guides.This paper evaluates and discusses the benefits that the compliant sprocket design provided. A multi-body dynamics system (MBS) model of the balancer chain drive has been developed, validated, and used to investigate the chain noise. This analytical model describes the entire balancer drive system coupled with a full cranktrain system. The balancer drive system contains a chain drive, balance shafts, and a…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Dynamic Analysis of a 3D Finger Follower Valve Train System Coupled with Flexible Camshafts

GM Powertrain-H.Y. Isaac Du, Jia-Shiun Chen
Published 2000-03-06 by SAE International in United States
A 3D dynamic model has been developed to investigate the dynamic response of a finger-follower cam system by considering the interaction between valve train and camshaft. The torsional moments being different for each cam cause the torsional vibrations of the camshaft. The resulting speed fluctuations of the cam affect the dynamics of other valve train components including the ultimate valve motion.To better represent the critical parts of the valve train, special attention was given to the cam and follower and to valve springs. The cam and follower are treated as a force contact relation so parts can separate and impact again. The valve springs are now treated as flexible bodies and important mass effects and coil contact events are captured during the simulation. The mass effects are associated with spring surge that occurs at high speed. Coil contact occurs when the individual coil in the spring collides.One bank of a V6 engine with overhead twin cams is modeled in this study. The complete flexible multi-body model of the valve train includes flexible camshafts, valves, springs…
Annotation ability available