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An Investigation Of Acceleration And Jerk Profiles Of Public Transportation Vehicles

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Conference

2008 Annual Conference & Exposition

Location

Pittsburgh, Pennsylvania

Publication Date

June 22, 2008

Start Date

June 22, 2008

End Date

June 25, 2008

ISSN

2153-5965

Conference Session

Electromechanical Curricula

Tagged Division

Engineering Technology

Page Count

13

Page Numbers

13.194.1 - 13.194.13

Permanent URL

https://peer.asee.org/3800

Download Count

3976

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Paper Authors

biography

Delton Martin Pennsylvania State University-Berks

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Delton L. Martin is an Electromechanical Engineering Technology student at Penn State Berks in Reading, PA. He received his associate degree in Mechanical Engineering Technology from Penn State (2005). He has served as vice president and president of the Berks student chapter of SAE and is also a research assistant for the EET program and a laboratory assistant for the MET program.

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Dale Litwhiler Pennsylvania State University-Berks

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Dale H. Litwhiler is an Assistant Professor at Penn State Berks-Lehigh Valley College in Reading, PA. He received his B.S. from Penn State University (1984), his M.S. from Syracuse University (1989) and his Ph.D. from Lehigh University (2000) all in electrical engineering. Prior to beginning his academic career in 2002, he worked with IBM Federal Systems and Lockheed Martin Commercial Space Systems as a hardware and software design engineer.

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Abstract
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

An Investigation of Acceleration and Jerk Profiles of Public Transportation Vehicles

Abstract The acceleration and braking profiles of several public transportation vehicles were investigated as part of an independent undergraduate student research project in Electro-Mechanical Engineering Technology. In particular, vehicles in which the passengers are often required to stand while the vehicle is moving were studied. These vehicles include city buses and subway trains. Vehicle acceleration, either positive or negative (braking), and the time rate of change of acceleration, jerk, can have a significant impact on the safety and comfort of passengers. The effects of acceleration and jerk are especially troublesome for passengers that either choose to stand or must stand in the vehicle because no empty seats are available. A standing passenger has a higher center of mass and smaller base footprint than one that is seated. The standing position is also less stable than the seated position. Therefore as the vehicle accelerates or changes its acceleration, standing passengers must exert significant forces with their limbs to maintain their balance. In this paper, the instrumentation and software used to measure the acceleration and jerk of some public transportation vehicles are presented and discussed. Instrumentation hardware and software typically used in an engineering technology laboratory was used for these measurements. The data obtained from the testing of several vehicles is analyzed and interpreted using software and techniques familiar to undergraduate engineering technology students. Fundamental dynamics associated with the human passengers is also presented and discussed. Careful control of the acceleration and braking profile of the vehicle can greatly improve the comfort and safety of the passengers. A suggested instrumentation and display system to help drivers control the acceleration profiles to improve passenger safety is presented. This project utilizes many aspects of the course and laboratory work of the four-year electro-mechanical engineering technology program. No human subjects were used in this study.

Introduction

Every year, commuters travel more than 20 billion miles by bus and 9 billion miles by commuter rail in the United States1. During the national average 24.4 minute commute to work, there are many factors affecting ride comfort2. Some of these factors are noise, temperature, humidity, and motion3. The factor of motion, including acceleration and jerk, will be examined as a transit vehicle comes to a complete stop. As the vehicle reaches zero velocity and does not reverse direction, the acceleration exhibits a very rapid (nearly discontinuous) change. This rapid change in acceleration imposes a large jerk on all elements in motion with the vehicle, including its passengers. Note that jerk is also referred to as jolt which is equally descriptive of this action. To better understand the physics of the linear motion experienced by ground vehicle passengers,

Martin, D., & Litwhiler, D. (2008, June), An Investigation Of Acceleration And Jerk Profiles Of Public Transportation Vehicles Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/3800

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