Selection guide of multi-objective optimization for ergonomic design

Abstract

Purpose The purpose of this paper is to propose the selection guide of the multi-objective optimization methods for the ergonomic design. The proposed guide enables designers to select an appropriate method for optimizing the human characteristics composed of the engineering characteristics (e.g. users’ height, weight and muscular strength) and the physiological characteristics (e.g. brain wave, pulse-beat and myoelectric signal) in the trade-off relationships. Design/methodology/approach This paper focuses on the types of the relationships between engineering or physiological characteristics and their psychological characteristics (e.g. comfort and usability). Using these relationships and the characteristics of the multi-objective optimization methods, this paper classified them and constructed a flow chart for selecting them. Findings This paper applied the proposed selection guide to a geometric design of a comfortable seat and confirmed its applicability. The selected multi-objective optimization method optimized the contact area of seat back (engineering characteristic associated with the comfortable fit of the seat backrest) and the blood flow volume (physiological characteristic associated with the numbness in the lower limb) on the basis of each design intent such as a deep-vein thrombosis after long flight. Originality/value Because of the lack of the selection guide of the multi-objective optimization methods, an inappropriate method is often applied in industry. This paper proposed the selection guide applied in the ergonomic design having a lot of the multi-objective optimization problem.

Mechanistic Modeling of Hydraulic Energy Transmission Technology of an Improved Dental Patient Chair Design

“…With internal area of the hydraulic cylinder 𝐴 = 𝑅 /𝑐𝑦𝑙 𝑝 𝑚𝑎𝑥 (10) The ram load 𝑊 𝑟𝑎𝑚 = 𝐻 𝑝 × 𝐴 × 𝜌𝑔 (11) The dead load of the eleveta-ble pantograph consisted of the chair and hydraulic ram 𝑊 𝑑𝑒𝑎𝑑 = 𝑊 𝑐ℎ𝑎𝑖𝑟 + 𝑊 𝑟𝑎𝑚 (12) Total load on the system is determined with…”

“…In this case, ergonomic stressors are involved in the study of interactions among humans and other elements of systems to optimize human well-being and overall system performance. In the existing literature, there was agreement on focusing on human factors, especially analysis of risk factors related to work equipment, work station design and human Egwuagu M. Onyekachi 1 , ETJ Volume 9 Issue 04 April 2024 behaviour [7][8][9] [10]. These were all encapsulated in ISO 6385 [11] in Figure 2.5.…”

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“…This further cor-roborates the opinion of [46] that MOO leads to various alternative solutions to a problem, with a compromise reached among the objectives considered. MOO has been widely used in facilitating objective decision-making in mathematics, business, science, and engineering [47][48][49]. It is also popular among scholars in the construction industry who have evaluated various aspects of decision-making [4,17].…”

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