Search results

The purpose of this paper is to provide an overview of the design and experimental work of compliant wing and wingtip morphing devices conducted within the EU FP7 project NOVEMOR and to demonstrate that the optimization tools developed can be used to synthesize compliant morphing devices.

The compliant morphing devices were “designed-through-optimization”, with the optimization algorithms including Simplex optimization for composite compliant skin design, aerodynamic shape optimization able to take into account the structural behaviour of the morphing skin, continuum-based and load path representation topology optimization methods and multi-objective optimization coupled with genetic algorithm for compliant internal substructure design. Low-speed subsonic wind tunnel testing was performed as an effective means of demonstrating proof-of-concept.

It was found that the optimization tools could be successfully implemented in the manufacture and testing stage. Preliminary insight into the performance of the compliant structure has been made during the first wind tunnel tests.

The tools in this work further the development of morphing structures, which when implemented in aircraft have potential implications to environmentally friendlier aircrafts.

The key innovations in this paper include the development of a composite skin optimization tool for the design of highly 3D morphing wings and its ensuing manufacture process; the development of a continuum-based topology optimization tool for shape control design of compliant mechanisms considering the stiffness and displacement functions; the use of a superelastic material for the compliant mechanism; and wind tunnel validation of morphing wing devices based on compliant structure technology.

Drawing upon the job demands-resources model, the purpose of this study is to investigate the differential relevance of contextual antecedents for job crafting dimensions (i.e. increasing structural and social job resources) and consequently for various aspects of work performance (in-role and extra-role performance). Despite considerable research on the role of job autonomy and social support in predicting job crafting, little attention has been paid to how problem-solving, a knowledge job characteristic, relates to job crafting dimensions.

Survey data were collected from 282 employees belonging to different information technology companies in Romania. Structural equation modeling was used to examine the hypothesized relations.

Problem-solving was positively related to both job crafting dimensions, whereas social support was positively related only to increasing social job resources. Unexpectedly, job autonomy predicted increasing structural resources only when social support was high, as the post-hoc analysis indicated. Furthermore, increasing structural job resources fully mediated the relationship of problem-solving with in-role performance and different types of extra-role behaviors, whereas increasing social resources did not act as a mediator.

The current study is the first to show that problem-solving is an important predictor for job crafting. Furthermore, this study contributes to the literature by revealing that crafting structural resources represents an important mechanism that explains the positive relationship between work design (i.e. problem-solving) and different performance facets.