دانلود رایگان مقاله لاتین رفتار جز استراتوسفر با مدل المان از سایت الزویر
عنوان فارسی مقاله:
تعیین رفتار جز استراتوسفر با استفاده از به روز رسانی مدل المان محدود
عنوان انگلیسی مقاله:
Determination of stratospheric component behaviour using Finite Element model updating
سال انتشار : 2016
برای دانلود رایگان مقاله رفتار جز استراتوسفر با مدل المان اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Scientific ballooning has been developed in the early 19th century, a few years after the invention of the hot air balloon by the Montgolfier brothers. This technique has been used frequently for scientific measurements since the entrance of lowdensity polyethylene balloons in the 1930s [1]. Even today, high altitude balloons are widely used in several disciplines e.g. atmospheric sciences, aeronautics, Earth observatory and physics on Earth and other planets [2]. The thermal design of spacecraft or balloon experiments is vitally important due to the extreme environmental conditions and zero-failure tolerances [3–5]. In general, thermal designs of balloon experiments are based on a combination of knowledge gained through previous experiments, empirical data and numerical simulations. Occasionally extra information is found by interpolating the environment at high altitude [6,3,5]. The use of accurate numerical models is essential to perform accurate simulations and to be able to design insulation techniques [7,8]. Finite element (FE) models, as explained in section 2.3, are widely used for virtual modelling and the prediction of the dynamic and the thermal behaviour of materials and lightweight structures [9,10]. These predictions are essential in the preparation * Corresponding author. E-mail address: jeroen.peeters2@uantwerpen.be (J. Peeters). URL: http://www.op3mech.be (J. Peeters). of atmospheric balloon experiments [11,4,12]. Since atmospheric and space experiments are generally very expensive, it is important to have an excellent knowledge of the interaction between the experiment and its environment in advance, which is effi- ciently gained through reliable simulations. In general until now, these simulations are made only in steady state conditions and are mapped to a structural analysis [7,10]. Recent research compares these models manually with complex ground experiments which simulate the space environment as for example the NIRVANA facility, but these experiments are expensive to perform [10]. Next to its importance for predicting the response of the system, simulations are also crucial to increase confidence in advanced experiment set-ups operating in extreme conditions present in the upper atmosphere [8]. All material parameters and thermal loads of the experiment should be known in order to generate accurate estimations of the thermal behaviour [3]. Recent research, as performed by Liu et al. [13] tries to further improve these numerical models by using transient, timedependent simulations in which the temperature and time-related parameters during the flight are approximated more accurately. The next step to improve the accuracy of the numerical models and predict the behaviour of balloon experiments is the combination of the numerical models with experimental measurements using numerical updating techniques like finite element model updating, known of system dynamics [14] and recently adapted to use for thermal models by Peeters et al. [15].For example, one of the important parameters in thermal radiation simulations which is essential to estimate correctly is the emissivity. This parameter is difficult to approximate correctly due to the influence of complex geometrical shapes [16].
برای دانلود رایگان مقاله رفتار جز استراتوسفر با مدل المان اینجا کلیک نمایید.
کلمات کلیدی:
Nonlinear Dynamics, Volume 1: Proceedings of the 34th IMAC, A ... https://books.google.com/books?isbn=3319297392 Gaetan Kerschen - 2016 - Technology & Engineering Chapter. 16. EMA-FEA. Correlation. and. Updating. for. Nonlinear. Behaviour. of ... (EMA) and Finite Element Analysis (FEA) of an automotive component where ... Shaker tests with force-controlled sine sweep excitation are performed for obtaining linearised data on different force levels for the updating step on the model. [PDF]Model Updating of the Ampair Wind Turbine Substructures - Dynamic ... substructure.engr.wisc.edu/substwiki/images/9/9a/295_gro_Stuttgart_IMAC2014.pdf by J Gross - Cited by 7 - Related articles Based on experimentally determined modal parameters the finite element models are adapted to achieve acceptable vibration behavior. Therefore ... method and a later assembly of the different parts by Component Mode Synthesis (CMS). ... In order to get validated finite element models, model updating methods [2] can. [PDF]structural dynamic model updating using eigensensitivity analysis www.imperial.ac.uk/media/imperial-college/research-centres-and.../40377700.PDF by H Jung - 1992 - Cited by 24 - Related articles developed which aim to improve or to correct the initial finite element model using ..... Analyses (or predictions) of the dynamic behaviour of the structure with .... Modal testing can also be used to construct dynamic models for components. Model Validation and Uncertainty Quantification, Volume 3: ... https://books.google.com/books?isbn=3319297546 Sez Atamturktur, Tyler Schoenherr, Babak Moaveni - 2016 - Technology & Engineering It is demonstrated that the updated finite element models obtained using ... the theoretical formulation of finite element model updating based on modal ... of the bicycle components leading to the final parametric CAD model is shown with the ... structural models used to model the dynamic behavior of the structure and let  2 ...
