Determination of directional stability using torsional pendulum concept for preliminary design of aerospace vehicles

Author(s):  
Muneebullah Nawaz ◽  
Syed Irtiza Ali Shah ◽  
Asad Ali ◽  
Anam Riaz
Author(s):  
Wei Chen ◽  
Janet K. Allen ◽  
Farrokh Mistree

Abstract In this paper, we introduce a concurrent approach to preliminary system design by using a modification of Taguchi’s method of robust design. It is possible to model interactions among component concept selections and synthesis of system variables. This approach also can improve computational efficiency and provide more design knowledge for the conceptual design of complex engineering systems. This technique is effective in dealing with both discrete and continuous variables simultaneously in design. We illustrate our approach by the preliminary design of a solar powered irrigation system. The selections of critical component concepts are integrated with the determination of system variables, i.e., the thermodynamic operating parameters.


2007 ◽  
Vol 35 ◽  
pp. 139-146
Author(s):  
Erika TSUCHIDA ◽  
Tsuyoshi FUJITA ◽  
Tadanobu NAKAYAMA ◽  
Tomohiko TSUNODA ◽  
Katsunori TAKAHASHI

Author(s):  
H Ahmed ◽  
JF Durodola ◽  
RG Beale

The objective of this article is to introduce and assess a new plate buckling analysis procedure which can be used for quick, approximate analysis of buckling loads in preliminary design. The method is applied to a range of plate edge support condition combinations including many where results are not readily available. The results obtained using the new procedure were compared against theoretical formulae available in the literature and by finite element analyses with good agreement.


2014 ◽  
Vol 607 ◽  
pp. 298-302
Author(s):  
Fakhruldin Mohd Hashim ◽  
M.F.A Ahmad

Conventional wet gas separators are used as a means to remove free water using the gravitational settling and momentum principle. However, these separators possess setback in terms of its efficiency. Alternatively, supersonic compact wet gas separators have been designed in Universiti Teknologi PETRONAS Gas Separation Research Center (UTPGSRC) which uses supersonic flow to separate natural gas and free water. In its preliminary design, determination of the flow behavior according to the design of the separators is important. The result provides information whether the design can be accepted or improvement should be taken into consideration. It is therefore an objective of this paper to numerically simulate and analyze the flow characteristic such as velocity, pressure and temperature distribution correlating with the separator design. From the flow performance results obtained, it shows that the separator design has fulfilled the requirement.


Author(s):  
Jacob J. Koester ◽  
Michael A. Langerman ◽  
Umesh A. Korde ◽  
James W. Sears ◽  
Gregory A. Buck

A thermal model of the laser powder deposition (LPD) process has been developed and tested. Results obtained from the model, however, are dependent upon the magnitude of the laser energy absorbed during the process. Although spectral absorptivities of metal surfaces are described in literature, during the LPD process, the powder increases the energy delivered to the substrate. There are no published data regarding this affect. Therefore, the SDSM&T Additive Manufacturing Laboratory (AML) is developing a calorimeter to experimentally investigate the affect of the powder on laser energy absorption at the metal substrate. The preliminary design is described in this paper with discussion on measures being taken to increase the accuracy of experimental data.


1950 ◽  
Vol 17 (3) ◽  
pp. 310-314
Author(s):  
R. L. Bisplinghoff ◽  
T. H. H. Pian ◽  
L. I. Levy

Abstract A mechanical-analogy-type analyzer is described which is used for computing the transient stresses in an undamped elastic structure. The two main functions of the analyzer are (a) to evaluate the stresses due to the deformations of an elastic structure in its various normal modes, and (b) to superpose the effects of the modes with proper regard taken of their phase relations. Function (a) is accomplished by the use of torsional-pendulum simulators, and function (b) by the proper design of the electronic pickup and recording circuit. The analyzer is particularly useful in the determination of dynamic landing stresses in airplane structures.


Sign in / Sign up

Export Citation Format

Share Document