Improving MTM-UAS to predetermine automotive maintenance times

Abstract

The preventive knowledge of serviceability times is a critical factor for the quantification of after-sales services costs of a vehicle. Predetermined motion time system are frequently used to set labor rates in industry by quantifying the amount of time required to perform specific tasks. The first such system is known as Methods-time measurement (MTM). Several variants of MTM have been developed differing from each other on their level of focus. Among them MTM-UAS is suitable for processes that average around 1–3 min. However experimental tests carried out by the authors in Elasis (Research Center of FIAT Group) demonstrate that MTM-UAS is not the optimal approach to measure serviceability times. The reason is that it doesn’t take into account ergonomic factors. In the present paper the authors propose to correct the MTM-UAS method including in the task analysis the study of human postures and efforts. The proposed approach allows to estimate with an “acceptable” error the time needed to perform maintenance tasks since the first phases of product design, by working on Digital Mock-up and human models in virtual environment. As a byproduct of that analysis, it is possible to obtain a list of maintenance times in order to preventively set after-sales service costs

Metot Zaman Ölçümü (MZÖ) Yöntemi İle Üretim Süresinin İyileştirilmesi: Beyaz Eşya Yan Sanayisinde Bir Uygulama

“…Gironimo vd. [9], MZÖ-UAS yönteminin ergonomik faktörleri dikkate almamasından kaynaklanan sıkıntıları gidermek için iyileştirme önerileri sunmuşlardır. Bures ve Pivodova [10], MZÖ-1 yöntemini iş ölçüm yöntemlerinden olan REFA ve BasicMOST yöntemleri ile karşılaştırmışlardır.…”

Sustainability Enhancement of a Turbine Vane Manufacturing Cell through Digital Simulation-Based Design

“…The latter is based on long-term workability and employability, which represent key elements in ergonomics and human factors. Ergonomics has ancient roots in the age of ancient Egypt and the Greek and Roman period [39]; in more recent times, research studies have shown the positive effects of applying ergonomic principles to manufacturing, e.g., in workplace design [40,41]. In [42], a study was described to demonstrate how the application of ergonomic principles during product design can effectively reduce life cycle costs.…”

“…In particular, 3D digital simulation was employed to calculate two ergonomic indices, namely the Posture Evaluation Index-PEI, and the Work Cell Evaluation Index-WEI, defined in [40], making it possible to numerically assess the ergonomic postures so that critical configurations can be identified and optimized through a proper layout reconfiguration. The Posture Evaluation Index allows us to identify whether a specific posture is deemed critical or not by integrating the results of the Low Back Compression Analysis (LBA) [46], Rapid Upper Limb Assessment (RULA) [47], and Ovako Working Posture Analysis System (OWAS) [48] in a synthetic adimensional index able to evaluate the "quality" of a posture, according to the equation presented in [40]:…”

Concept design in virtual reality of a forestry trailer using a QFD-TRIZ based approach

“…For the evaluation of the interaction with people, the use of manikins is necessary. Recent studies have shown some advantages of using manikins in a virtual environment and for the simulation of human tasks (Di Gironimo et al, 2012a;Di Gironimo et al, 2012d).…”