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Sudhakar L. Rajulu

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Publication statistics

Pub. period:1991-1994
Pub. count:4
Number of co-authors:9

Co-authors

Number of publications with 3 favourite co-authors:

William S. Marras:2
Glenn K. Klute:2
Robert P. Wilmington:1

Productive colleagues

Sudhakar L. Rajulu's 3 most productive colleagues in number of publications:

William S. Marras:34
Steven A. Lavender:17
Sue A. Ferguson:8

Calendar

May 20

CTS 2013 - The 2013 Intl. Conf. on Collaboration Techn. and Systems

May 22

Knowing (by) Designing 2013

May 27

13th Intl. Conf. on New Interfaces for Musical Expression

May 19

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Sudhakar L. Rajulu

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Publications by Sudhakar L. Rajulu (bibliography)

1994

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Rajulu, Sudhakar L., Klute, Glenn K. and Wilmington, Robert P. (1994): Evaluation of Crew Capabilities to Handle and Stabilize Heavy Masses in Microgravity. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 583-587.

“One of the purposes of NASA's Shuttle missions is to deploy and retrieve satellites. Some of these missions require extravehicular activities (EVAs). During EVAs, crew members wear pressurized suits for protection from hazardous conditions and use a Remote Manipulator System (RMS) to transfer heavy objects from one location to another. Prior to the Hubble Space Telescope repair mission (STS-61), concerns were raised whether crew members would be able to hold onto the modules if the RMS started or stopped unexpectedly. An experiment was conducted to measure the handle forces during such a scenario and to determine whether these forces and moments were well within the capabilities of the crew. Four subjects participated in the study. Mockups were built to represent the characteristics of the actual unit and tests were conducted at the Precision Air Bearing Facility (PABF) which simulates a nearly friction-free environment. Force plates were attached to the mockups to monitor forces and moments during the test. Controlled translation and rotation tasks were also conducted to compare the results with those of sudden RMS run start/stop tasks. The results from this study showed that the forces and moments exerted by subjects during sudden stopping and starting conditions were well within the capabilities of the crew members. This study thus provided quantitative data for NASA to be assured of a safe and successful mission.”

1992

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Rajulu, Sudhakar L. and Klute, Glenn K. (1992): Biomechanical Analysis of Locomotion Patterns in Earth, Lunar, and Martian Gravity Environments. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 724-728.

“The primary objectives of this study were to determine the factors that affect stability during locomotion in both lunar and martian gravity environments and to determine the criteria needed to enhance stability and traction. This study tested the effects of three different speeds of locomotion and three different patterns of locomotion under three gravity conditions. The results showed some similarities across gravity levels with regard to changing the speed as well as the pattern of locomotion. Interestingly, the study also showed that as the gravity level decreased, the ratio of horizontal to vertical forces increased significantly. It appears that the tendency to move forward will be more in reduced gravity than compared to earth gravity. Thus, to ensure safe locomotion in reduced gravity, additional traction might be needed. Finally, selection of an appropriate traction material surface should be based on how well the ratio of horizontal to vertical forces is reduced.”

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Marras, William S., Lavender, Steven A., Leurgans, Sue E., Rajulu, Sudhakar L., Allread, W. Gary, Fathallah, Fadi A. and Ferguson, Sue A. (1992): Industrial Quantification of Occupationally-Related Low Back Disorder Risk Factors. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 757-760.

“Few assessment techniques have attempted to define the role of occupational trunk motion in the risk of occupationally-related low back disorder (LBD) even though laboratory studles have indicated that motion significantly increases spine loading. An in-vivo study was performed to assess the contribution of three-dimensional dynamic trunk motions to the risk of LBD during occupational lifting in industry. Over 400 industrial lifting jobs were studied in 48 industries. Specific manual materials handling jobs historically identify as either high risk or low risk for LBD were identified. A tri-axial electrogoniometer was worn by workers and documented the three-dimensional trunk motion characteristics associated with these high risk or low risk jobs. Workplace characteristics such as load moment arm, load weight, etc. were also documented for each of the repetitive lifting tasks. A multiple logistic regression model indicated that a combination of five trunk motion and workplace factors (lifting frequency, load moment, trunk lateral velocity, trunk twisting velocity, and trunk sagittal angle) predicted occupational-related LBD risk well. The analyses have enabled us to determine the LBD risk associated with combined changes in the magnitudes of the five factors. This model could be used as a quantitative, objective measure to redesign the workplace so that the risk of occupationally-related LBD is minimized.”

1991

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Rajulu, Sudhakar L., Marras, William S. and Woolford, Barbara (1991): An Improved Simulation Based Biomechanical Model to Estimate Static Muscle Loadings. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 790-794.

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