Efficient Optimum Design of Structures with Frequency Response Constraints using High Quality Approximation

2009 ◽  
Author(s):  
E. Salajegheh
Keyword(s):  
Frequency Response ◽  
Optimum Design ◽  
High Quality

Designing Clean Jet-Noise Facilities and Making Accurate Jet-Noise Measurements

2003 ◽  
Vol 2 (3) ◽  
pp. 371-412 ◽  
Author(s):  
K. K. Ahuja
Keyword(s):  
Frequency Response ◽  
Internal Noise ◽  
Jet Noise ◽  
Noise Spectrum ◽  
Full Scale ◽  
Research Facility ◽  
High Quality ◽  
Jet Engine ◽  
Noise Measurements ◽  
Noise Data

The main objective of this paper is to provide guidelines for designing and calibrating a high quality, static, jet-noise research facility and making high-quality jet noise measurements. Particular emphasis is placed on methodology for determining if internal noise is dominant in the jet noise spectrum. A section of this document is devoted to clarifying the terminology associated with microphone frequency response corrections and providing a step-wise description of other corrections that must be applied to the measured raw spectra before the jet noise data can be considered accurate and ready for use for extrapolation to full-scale jet engine noise.

Thermal Characteristics of the Headstock System on the NC Precision Lathe

2006 ◽  
Vol 315-316 ◽  
pp. 164-168
Author(s):  
C. Guo ◽  
Qing Hong Sun
Keyword(s):  
Optimum Design ◽  
High Speed ◽  
3D Model ◽  
Thermal Characteristics ◽  
Numerical Results ◽  
High Quality ◽  
Modern Industry

High speed and high quality precision are essential requirements of NC lathes in modern industry. Since the heat generated from headstock system is a major factor causing machining inaccuracy, in this work, the thermal 3D model of the headstock system is built and its thermal characteristics are investigated using FEM. From the comparison of the numerical results with the experiment results, it is found that the FEM predicted well the thermal characteristics of the headstock system and the model is reliable to further optimum design of the headstock system.

Optimum design of circular CMUT membranes for high quality factor in air

2008 ◽  
Author(s):  
K. K. Park ◽  
H. J. Lee ◽  
P. Crisman ◽  
M. Kupnik ◽  
O. Oralkan ◽  
...  
Keyword(s):  
Quality Factor ◽  
Optimum Design ◽  
High Quality Factor ◽  
High Quality

Contour Errors during Milling Process

2012 ◽  
Vol 463-464 ◽  
pp. 647-650
Author(s):  
Doina Marin ◽  
Nicolae Predincea
Keyword(s):  
Frequency Response ◽  
Dimensional Accuracy ◽  
Milling Process ◽  
Linear Motion ◽  
High Quality ◽  
Know How ◽  
Motion Trajectories ◽  
And Control

To achieve high quality and productivity during continuous contouring, it is important to know how the two axes work together to move the machine in a circular or rectangular path. For this reason, we have analyzed circular and linear motion trajectories and the frequency response of the system during milling process. In the same time, is required to analyses simultaneously both mechanical and control subsystems. Based on these problems, the main objectives of this work have been defined to find a way to improve dimensional accuracy.

Optimum Design of an Internal 8-Electrode Electrical Capacitance Tomography Sensor Array

2012 ◽  
Vol 508 ◽  
pp. 84-87
Author(s):  
De Cai Lu ◽  
Fu Qun Shao ◽  
Ying Xia Cao
Keyword(s):  
Optimum Design ◽  
Sensor Array ◽  
Design Method ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
High Quality ◽  
Sensor Model ◽  
Grain Distribution ◽  
Optimal Design Method ◽  
Capacitance Tomography

This paper introduced an optimum design method of sensor array suitable for electrical capacitance tomography (ECT) based on high AC excitation voltage. The sensor parameters of electrode span and length were optimized in turn, and a sensor model for testing was fabricated according to optimal objects. The image reconstruction experimental resultants of grain distribution indicated that high quality images could be reconstructed by the sensor model. This proved the optimal design method of ECT sensor given in this paper was feasible and the parameters were also credible.

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