Nonlinear aeroservoelastic analysis of a supersonic aircraft with control fin free-play by component mode synthesis technique

2021 ◽  
Vol 493 ◽  
pp. 115835
Author(s):  
Wei Tian ◽  
Yingsong Gu ◽  
Hao Liu ◽  
Xiaochen Wang ◽  
Zhichun Yang ◽  
...  
2020 ◽  
Vol 51 (3) ◽  
pp. 795-806 ◽  
Author(s):  
Elizabeth J. Short ◽  
Rachael Cooper Schindler ◽  
Rita Obeid ◽  
Maia M. Noeder ◽  
Laura E. Hlavaty ◽  
...  

Purpose Play is a critical aspect of children's development, and researchers have long argued that symbolic deficits in play may be diagnostic of developmental disabilities. This study examined whether deficits in play emerge as a function of developmental disabilities and whether our perceptions of play are colored by differences in language and behavioral presentations. Method Ninety-three children participated in this study (typically developing [TD]; n = 23, developmental language disorders [DLD]; n = 24, attention-deficit/hyperactivity disorder [ADHD]; n = 26, and autism spectrum disorder [ASD]; n = 20). Children were videotaped engaging in free-play. Children's symbolic play (imagination, organization, elaboration, and comfort) was scored under conditions of both audible language and no audible language to assess diagnostic group differences in play and whether audible language impacted raters' perception of play. Results Significant differences in play were evident across diagnostic groups. The presence of language did not alter play ratings for the TD group, but differences were found among the other diagnostic groups. When language was audible, children with DLD and ASD (but not ADHD) were scored poorly on play compared to their TD peers. When language was not audible, children with DLD were perceived to play better than when language was audible. Conversely, children with ADHD showed organizational deficits when language was not available to support their play. Finally, children with ASD demonstrated poor play performance regardless of whether language was audible or not. Conclusions Language affects our understanding of play skills in some young children. Parents, researchers, and clinicians must be careful not to underestimate or overestimate play based on language presentation. Differential skills in language have the potential to unduly influence our perceptions of play for children with developmental disabilities.


Derrida Today ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 22-36 ◽  
Author(s):  
Yifeng Sun

Deconstruction is decidedly unsettling in that it destabilizes the otherwise comfortably assumed understanding of the nature of translation. What is also controversial is that it may make translation impossible, considering that it explicitly acknowledges the impossibility of translation. Yet Derrida emphasizes the necessity of translation as well, thus foregrounding the need to negotiate with the non-negotiable, and for this reason, to translate the untranslatable. Deconstruction captures and elucidates the complexity of translation in relation to the variability and complexity of its nature and practice. Despite the disconcerting observation of his devastatingly relativist overtone and open-endedness, Derrida does not uphold complete free play, as is repeatedly pointed out by himself and other scholars. This paper argues that the context of translation plays a regulating role and intends to unravel what he calls translation as both possible and impossible, both respectful and abusive. Inspired by Derrida's profound contention that translation is in a way more about ‘what is not there’ than ‘what is there’, this paper will map some of the multiple implications of meaning and various modes of representation in translation, in which different meanings can be played with so as to give rise to spaces for exploring and expanding the range of translation strategies and methods.


2001 ◽  
Vol 29 (1) ◽  
pp. 23-43 ◽  
Author(s):  
D. Tsihlas ◽  
T. Lacroix ◽  
B. Clayton

Abstract Different numerical sub-structuring techniques for the representation of tire modal behavior have been developed in the past 20 years. By using these numerical techniques reduced dynamic models are obtained which can not only be used for internal studies but also be provided to the automobile industry and linked to reduced dynamic vehicle models in order to optimize the coupled vehicle-tire response for noise vibration and harshness purposes. Two techniques that have been developed in a custom-made finite element code are presented: 1) the component mode synthesis type models for which the wheel center interface is free and 2) the Craig and Bampton type models for which the wheel center interface is fixed. For both techniques the interface between the tire and the ground is fixed. The choice of fixed or free wheel center boundary condition is arbitrary. In this paper we will compare the formulation of these two numerical methods, and we will show the equivalency of both methods by showing the results obtained in terms of frequency and transfer functions. We will show that the two methods are equivalent in principle and the reduced dynamic models can be converted from one to the other. The advantages-disadvantages of each method will be discussed along with a comparison with experimentally obtained results.


AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 1285-1291
Author(s):  
Jeffrey A. Morgan ◽  
Christophe Pierre ◽  
Gregory M. Hulbert

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