The dynamic characteristics of a part are highly dependent on geometric and material properties of the part. The identification and tracking of vibrational mode shapes within an iterative design process becomes difficult and time consuming due to the frequently changing part definition. Currently, visual inspection of analysis results is used as the means to identify the shape of each vibrational mode determined by the modal analysis. This thesis investigates the automation of the mode shape identification process through the use of parametric geometry and the Modal Assurance Criterion. Displacement results from finite element modal analysis are used to create parametric geometry templates which can be compared one to another irrespective of part geometry or finite element mesh density. Automation of the mode shape identification process using parametric geometry and the Modal Assurance Criterion allows for the mode shapes from a baseline design to be matched to modified part designs, giving the designer a more complete view of the part's dynamic properties. It also enables the identification process to be completed much more quickly than by visual inspection.

Lorsqu’il entre dans l’adolescence, le sujet doit faire preuve d’une grande mobilisation pour affirmer sa nouvelle identité et devenir un acteur dynamique et autonome, auteur de son histoire (Malrieu, 1973). La société vietnamienne est actuellement traversée par la rencontre culturelle du traditionnel et du moderne, avec la domination des nouvelles technologies et d’Internet. Les adolescents doivent alors vivre leur crise en même temps que des conflits contextuels (Nguyen Khac Vien, 1997). L’objectif de notre recherche est d’étudier la façon dont les adolescents vietnamiens de la génération actuelle s’identifient aux autres et aux événements sociaux et comment ces formes identificatoires influencent la manière dont ils se projettent vers l’avenir. Nous cherchons aussi à analyser l’impact de l’usage d’Internet, une nouvelle pratique des jeunes, sur la relation entre ces modes d’identification et le projet d’avenir de ces derniers.Par le biais de questionnaires et d’épreuves projectives (le TAT et le Test des Trois Personnages), nous avons effectué notre recueil des données auprès de 102 adolescents vietnamiens (53 filles et 49 garçons) âgés de 16,5 à 18 ans et ayant une pratique assidue d’Internet. Nos résultats montrent que chez les adolescents de notre échantillon, certains modes défensifs d’identification sont significativement associés à des dimensions positives de leur projet et à un usage approprié d’Internet. Nos résultats confirment également que le style de pratique d’Internet a un effet médiateur sur la relation entre le mode d’identification et le projet d’avenir, dans la mesure où le lien positif entre l’identification de dépendance et les projets d’accomplissement relationnel et professionnel est modulé par les pratiques d’Internet qui alimentent des devoirs et des tâches scolaires. En replaçant les résultats saillants de notre recherche dans le contexte actuel de la société vietnamienne, une analyse interprétative, étayée par des avancées théoriques en psychologie, nous permet d’éclairer et d’expliquer ces résultats. / When entering adolescence, a subject must highly mobilize himself to confirm his new identity and become a dynamic and autonomous being, author of his life (Malrieu, 1973). Vietnamese society is currently passing through the cultural encounter between traditional values and modern trends, with the domination of information and communication technologies and the Internet. The adolescents must then experience their crisis period at the same time as contextual conflicts (Nguyen Khac Vien, 1997). The objective of our research is to study how the current generation of Vietnamese adolescents identifies with others and how these modes of identification influence the way they project themselves into the future. Our aim is also to analyze the impact of Internet use, a teenagers’ new practice, on the relationship between their modes of identification and future plans.Using questionnaires and projective tests (the TAT and the Test of Three Characters), we conducted our data collection from 102 Vietnamese adolescents (53 girls and 49 boys) aged 16.5 to 18 and regularly using the Internet.Our results show that among the adolescents in our sample, some defensive modes of identification are significantly associated with the positive aspects of their future plans as well as with an appropriate style of Internet use. Our results also confirm that the style of Internet use has a mediating effect on the relationship between the mode of identification and future plans; more precisely the positive link between the identification of dependence and the plans of relational and professional achievement is explained by the Internet practices serving school duties and tasks. Supported by theoretical advances in psychology, we analyzed, explained and clarified the salient results of our research in an interpretative way by replacing these results in the current context of Vietnamese society.

In any design, the dynamic characteristics of a part are dependent on its geometric and material properties. Identifying vibrational mode shapes within an iterative design process becomes difficult and time consuming due to frequently changing part definition. Although research has been done to improve the process, visual inspection of analysis results is still the current means of identifying each vibrational mode determined by a modal analysis. This research investigates the automation of the mode shape identification process through the use of parametric geometry and machine learning.In the developed method, displacement results from finite element modal analysis are used to create parametric geometry which allows the matching of mode shapes without regards to changing part geometry or mesh coarseness. By automating the mode shape identification process with the use of parametric geometry and machine learning, the designer can gain a more complete view of the part's dynamic properties. It also allows for increased time savings over the current standard of visual inspection