As ergonomics has become an integral part of the design process, digital human modeling is a rapidly emerging area that links computer-aided engineering design, human factors engineering and applied ergonomics. This paper briefly presents some of the basic principles of user-centered design and their relationship to ergonomics, together with the application of digital human modeling (DHM) in the design process of an assistive walking aid for elderly users with low mobility, considering the assessment of risk and comfort of the system. The use of DHM in order to improve certain features of a system or product is not a new concept, various types of digital human models being used for over 35 years. Using the Human Builder module in CATIA V5 two human models are generated with the help of anthropometric data collected from a group of >65 years old participants living in assistive care centers. The models are further employed in testing the safety and comfort level of the walking aid currently used by the participants, resulting the need of immediate changes in the device.

Based on the experimental research and of theoretical studies in the paper it is presented recommendations and possibilities for the multicriteria optimization of the machining processes. For the application, it is analyzed in this way, the case of the turning process, in special the operation of roughness. The results of the research are analyzed, in special, with the help of suggestive graphs, based on it is presented recommendations for the optimizations of the design and technological process for the machining production from energy consumption, costs and productivity point of view.

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Changing the design with each car line launched, the automotive industry must always adapt as quickly as possible to the needs of the customer and find new and efficient methods to verify the quality in time and in costs. In the case of the interior body parts the quality control is always a quest, because the parts must be verified with a control system that is simulating the exact position in the car. This paper presents a normalization of how this control system should be designed and build in order to verify the quality of the interior body parts.

The surface quality obtained by the manufacturing process depends on several factors determined by the particular cutting process. The task of optimization of design and making the process machining by one or more performance functions is very important. In this direction, between the simplest ways to make this optimization are: adapting the process parameters, optimization of constructive parameters of cutting tools, selection of working domain of cutting tools in accordance with the importance of performance criterions adopted to optimization. In this paper we are evaluate the risks using Failure Mode and Effects Analysis (FMEA) for a drilling process considering the equipment and measuring devices. The Process FMEA is used to identify the potential consequences of errors and omissions in the production process and develop the production control plan. In this respect, there are identified the factors that influence the manufactured products quality with emphasis on the interaction between failure modes and effects. Pareto charts are developed for specific potential causes of failure in order to determine and implement the methods of improvement, and the risks that have a significant impact on the manufacturing process, and every corrective action must be evaluated taking into account the expected risk priority value.