Type of Document	Dissertation
Author	Clark, Laura L. Jr.
Author's Email Address	laclark2@vt.edu
URN	etd-12898-174432
Title	Design and Testing of a Quick-Connect Wheelchair Power Add-On Unit
Degree	PhD
Department	Industrial and Systems Engineering
Advisory Committee	Advisor Name Title Casali, John G. Committee Chair Hanes, L. Thompson Committee Member Koelling, Charles Patrick Committee Member Williges, Beverly A. Committee Member Williges, Robert C. Committee Member
Keywords	power attachment usability testing electric wheelchair product evaluation
Date of Defense	1997-12-04
Availability	unrestricted
Abstract A quick-connect wheelchair power add-on unit (PAU) has been developed at the Human Factors Engineering Center of Virginia Tech. The objective of the new invention is to provide an inexpensive, highly portable product which can quickly convert a manual wheelchair into a power-operated wheelchair. This dissertation details the three year research and design effort to develop the new wheelchair PAU. Results are presented from a series of evaluations conducted to identify performance and user-interaction characteristics of the PAU. Interpretation of the results provides a prioritized list of identified design deficiencies along with wheelchair expert and design team suggestions for the next generation of design alterations. The three evaluations conducted with the second generation PAU prototype include a series of wheelchair expert interviews, a PAU performance evaluation, and a usability evaluation which utilized wheelchair operators as subjects. Also included in the dissertation is an explanation of the need for a new PAU, a description of the most recent design iteration, a literature review containing information about the history of wheelchairs, the condition of the current PAU market, and an analysis of wheelchair PAU consumers. The new invention was conceived and patented by Dr. John G. Casali of the Industrial and Systems Engineering (ISE) Department at Virginia Tech. This research was supported jointly by Southwestern Applied Technologies, L. C., of Roanoke, Virginia and Virginia's Center for Innovative Technology in Herndon, Virginia.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    a10_steer_bar_cover.pdf 2.80 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a11_handle.pdf 3.04 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a12_slipring_cover.pdf 2.16 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a13_inner_tube.pdf 2.55 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a14_outer_tube.pdf 3.52 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a15_crossbar.pdf 3.15 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a16_poppits.pdf 3.35 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a17_finger_grip.pdf 3.17 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a18_col_cross_block1.pdf 2.21 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a19_col_cross_block3.pdf 3.49 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a20_col_cross_block4.pdf 3.46 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a21_wheel_supp_side.pdf 2.69 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a22_wheel_supp_top.pdf 2.69 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a23_tube_block.pdf 2.63 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a24_gearbox.pdf 3.81 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a25_gearbox_cover.pdf 2.10 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a26_motor_cover1.pdf 3.20 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a27_motor_cover2.pdf 3.57 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a28_motor_1support.pdf 2.44 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a29_motor_2support.pdf 2.16 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a2_spring_housing.pdf 11.58 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   a30_axle_aug.pdf 2.89 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a31_sling_pattern.pdf 3.15 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a3_drivetrain.pdf 6.65 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a4_sec_block1.pdf 5.80 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a5_sec_block3.pdf 3.10 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a6_sec_block5.pdf 3.83 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a7_sec_block7.pdf 4.36 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a8_sec_block9.pdf 2.64 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   a9_steer_bar.pdf 4.61 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   appendices.pdf 140.01 Kb 00:00:38 00:00:20 00:00:17 00:00:08 < 00:00:01   b1_manual_chair.pdf 10.76 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   conclusion.pdf 15.71 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01   contents.pdf 17.50 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01   design_recommendations.pdf 44.78 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01   expert_evaluation.pdf 28.72 Kb 00:00:07 00:00:04 00:00:03 00:00:01 < 00:00:01   introduction.pdf 27.00 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01   literature_review.pdf 77.99 Kb 00:00:21 00:00:11 00:00:09 00:00:04 < 00:00:01   papoose.pdf 12.92 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   performance_evaluation.pdf 48.02 Kb 00:00:13 00:00:06 00:00:06 00:00:03 < 00:00:01   redpak.pdf 14.00 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   sling.pdf 11.54 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   table_10_pre_est.pdf 3.04 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_11_post_est.pdf 3.06 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_12_ci.pdf 5.47 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_13_co.pdf 9.31 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   table_7_timedata.pdf 2.78 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_8_ci_blank.pdf 1.62 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_9_times.pdf 4.13 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   table_c1_patent.pdf 2.94 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   usability_evaluation.pdf 84.52 Kb 00:00:23 00:00:12 00:00:10 00:00:05 < 00:00:01

If you have questions or technical problems, please Contact DLA.