Aerospace and Mechanical Engineering by Qi Luo

By Qi Luo

Show description

Read or Download Aerospace and Mechanical Engineering PDF

Similar aeronautical engineering books

Theory of lift. Introductory computational aerodynamics in MATLAB

Ranging from a easy wisdom of arithmetic and mechanics received in average starting place periods, thought of raise: Introductory Computational Aerodynamics in MATLAB/Octave takes the reader conceptually via from the basic mechanics of raise  to the level of truly with the ability to make functional calculations and predictions of the coefficient of elevate for reasonable wing profile and planform geometries.

Fundamentals of Spacecraft Attitude Determination and Control

This booklet explores subject matters which are imperative to the sphere of spacecraft angle choice and keep watch over. The authors supply rigorous theoretical derivations of vital algorithms observed by means of a beneficiant volume of qualitative discussions of the subject material. The publication records the improvement of the real options and strategies in a fashion available to practising engineers, graduate-level engineering scholars and utilized mathematicians.

Extra info for Aerospace and Mechanical Engineering

Sample text

4 The netted structure used for self-facing and the aluminum perforated panel Fig. 5 Sketch of the palm date fibers sample and the PP inside the impedance tube Results and Discussion Sound absorption of the uncovered sample (UC), self-facing natural date palm fibers and facing using PP aluminum plate has been investigated. The experimental results for the three cases are shown in Fig. 6. The results show a good improvement in the sound absorption for the self-facing panel for the whole frequency range.

Photo of the system is shown in Fig. 3. Noise generator transmitted a random noise into the tubes. Interior sound pressure spectrum was measured by the two microphones and transfer functions between them were calculated. The acoustical absorption coefficient was calculated from these transfer functions and distances between the microphones and date palm fiber sample. The frequency span of experiment was 100–5000 Hz with 3 Hz resolution. The frequency range for the 100 mm diameter tube is up to 1000 Hz and for the 28 mm diameter tube is above 1000 Hz.

The sample was then faced with the originally date palm fiber netted structure. The results show a good improvement in the sound absorption for the self-facing panel for the whole frequency range. However, when using the aluminum perforated panel an improvement in the sound absorption was observed only above 2500 Hz. The effect of introducing air gap thickness was studied. The results show improvement for the sound absorption the low frequency. Introduction Vegetable fiber is one of the varieties of natural fibersobtained from stems, leaves, roots, fruits and seeds ofplants.

Download PDF sample

Rated 4.91 of 5 – based on 32 votes

Author: admin