Global Journal of Researches in Engineering, G: Industrial Engineering, Volume 23 Issue 2

Task#1: A mass of 158kg [19] was added to the cabin door, and the hinge joint in the door was set to velocity tracking for movement. An anchor was used to set the axis of rotation of the door, and an angular drag of 1000N was set to provide resistance and prevent the door from moving freely or swinging after being pushed. To realistically imitate the door opening task, each subject's left hand needed to be pressed against the real physical wall, while their right hand needed to grab the VR door to open it. Rotational limits were set in the program at the fuselage and 90 degrees open to ensure the same ending position for all subjects. After completing the task, the subjects were required to close the cabin door to its original position. Task#2: The task is a two-hand lifting task that involves lifting the luggage. The luggage was designed in Autodesk Fusion 360 and imported as an asset, but it only had a visual mesh and did not allow for interaction. Therefore, convex mesh colliders were added to the luggage, and giving it a rigid body with a mass of 10kg [20]. The luggage handle was chosen as the first grab point, and a cube was made as a subunit of the main luggage with a collider added, which was placed at the bottom of the luggage as the second grab point. The overhead compartment was given a mesh collider so the luggage could be placed inside it. (a) (b) (c) (d) Figure 2.3: Two Common Tasks for Subjects to Perform. (a) Opening the Passenger Door; (b) Closing the Passenger Door; (c) Lifting the Luggage from the Floor; (d) Placing the Luggage into the Overhead Compartment d) Data Analysis The focus of this study was on identifying postures that could put aircraft attendants at a high risk of injury during task performance. Specifically, four postures were detected where excessive forces were exerted on the 4th/5th (L4/L5) lumbar spine. Global Journal of Researches in Engineering Volume XxXIII Issue II Version I 4 Year 2023 © 2023 Global Journals ( ) G Evaluating the Risk of Injury for Aircraft Attendants using Virtual Reality and Advanced Motion Tracking System Integrated with Ergonomics Analysis c) Operational tasks Two common tasks were designed for subjects: 1) opening the cabin door from the inside of the aircraft, and 2) lifting a carry-on luggage for passengers, as shown in Figure 2.3. Each task was repeated four times to ensure the high reliability of the collected data.