Are there differences in walking and the movement of the items being carried between products that are easy to carry and those that are not? Let me introduce this using a school backpack as an example.
【Purpose of Evaluation】 This evaluation assesses the differences in posture and movement of individuals, as well as the relative movement between a person and a backpack, between backpacks that are easy to carry and those that are not. 【Evaluation Method】 Various backpacks will be worn, and subjective and behavioral evaluations will be conducted during predetermined movements to assess the factors that influence ease of carrying. ■ Target Movements (while wearing the backpack) - Standing still - Jumping in place - Walking ■ Subjective Evaluation - Ease of carrying - Degree of burden on the body (shoulders, sides, back, etc.) ■ Motion Evaluation using the Anakin System - Posture and movement Using the Anakin System, we will primarily measure posture and movement during walking (the tilt and sway of the torso to the left, right, forward, and backward). - Sway of the backpack By attaching auxiliary markers to the backpack and using the Anakin System, we will measure its relative movement with respect to the body (third lumbar vertebra). - Pressure between the shoulder straps and the body Pressure will be measured using load cells. ■ Evaluation Results It was found that backpacks that are difficult to carry result in a greater range of body sway in a forward-leaning posture, both laterally and front-to-back. Additionally, there is a significant relative displacement between the person and the backpack.
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【Relative Movement Between People and Objects】 In the Anakin system, we can measure the "relative movement between people and objects." One example is the randoseru (Japanese school backpack). By attaching auxiliary markers to the randoseru and clicking on them with a mouse on a monitor, we can express the position of the auxiliary markers in the same coordinates as the person's movement. In other words, we can measure the distance and relative movement to a certain joint point of a person. 【Examples of Products Used on the Back】 - Randoseru - Shoulder bag - Backpack - Bag - Child carrier 【Structure of Products Used on the Back】 Let’s take the randoseru as an example. ■ Main Body Components - Large compartment - Medium compartment - Small compartment - Flap - Backrest - Handle - Hanging ring - Lock *Points to Consider for Main Body Components - The size of the randoseru changes depending on the amount of items stored, such as textbooks and gym clothes. - Material and structure of the backrest that make it easy to carry and prevent sweating. ■ Shoulder Strap Components - Shoulder strap - Lower strap - Back ring - Daruma ring - Lock insertion *Points to Consider for Shoulder Strap Components - Material, structure, and shape that make it easy to carry (non-slip, less burden on the body, etc.). - Shoulder straps that are easy to attach and detach. - Shoulder strap and lower strap combined for ease of handling.
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HAL Design Research Institute Co., Ltd. is a company that conducts analysis, design, engineering, and consulting based on various measurements and measurement data. Our main product is the "Markerless 3D Motion Analysis System." We also offer a variety of other measurement services, so please feel free to contact us if you have any requests.