Using an optimisation process for sailplane winglet design

2016 ◽  
Vol 120 (1233) ◽  
pp. 1726-1745 ◽  
Author(s):  
A. Travis Krebs ◽  
B. Dr. Götz Bramesfeld
Keyword(s):  
High Speed ◽  
High Performance ◽  
Bending Moment ◽  
Total Drag ◽  
Multi Objective ◽  
Traditional Design ◽  
Efficient Alternative ◽  
Cross Country ◽  
The Cost ◽  
Performance Gains

ABSTRACTA multi-objective optimisation process is used to design winglets for a high-performance sailplane. The primary optimisation objective is to maximise the average cross-country speed over a range of thermal strengths. Additional contributions to the cost functions are the limitation of the total drag during high-speed cruise and the additional root bending moment due to the winglet. Rather than being a pure design study, the purpose of the herein presented study is to demonstrate that a multi-objective optimisation approach is a suitable and efficient alternative to the more traditional, experienced-based design approach. The flight performance of the winglet designs are evaluated using a higher-order potential flow method. Results of the optimisation are hand-selected for further analysis. They are compared to a traditionally designed winglet for the same aircraft, designed with similar objectives in mind. The chosen final designs provide an increase in average cross-country speed of 1.5% at lower thermal strengths and 0.4% at higher thermal strengths when compared to the traditional design. When approximating the effects of trim drag due to wing loading and static margin, these performance gains fall to 0.6% and 0.1% respectively, more closely matching the performance of the traditionally designed winglet. The final designs, along with the traditional design, provide performance benefits across all airspeeds of the flight envelope of the base aircraft without winglets.

scholarly journals Ultra-high speed reconfigurable microwave and radio frequency photonic intensity differentiators using Kerr frequency optical microcombs

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Radio Frequency ◽  
High Speed ◽  
High Performance ◽  
Third Order ◽  
Transversal Filter ◽  
Multi Wavelength ◽  
Gaussian Input ◽  
On Chip ◽  
The Cost ◽  
Good Agreement

Abstract We propose and experimentally demonstrate a microwave photonic intensity differentiator based on a Kerr optical comb generated by a compact integrated micro-ring resonator (MRR). The on-chip Kerr optical comb, containing a large number of comb lines, serves as a high-performance multi-wavelength source for the transversal filter, which will greatly reduce the cost, size, and complexity of the system. Moreover, owing to the compactness of the integrated MRR, up to 200-GHz frequency spacing of the Kerr optical comb can be achieved, enabling a potential operation bandwidth of over 100 GHz. By programming and shaping individual comb lines according to the calculated tap weights, a reconfigurable intensity differentiator with variable differentiation orders can be realized. The operation principle is theoretically analyzed, and experimental demonstrations of first-order, second-order, and third-order differentiation functions based on the principle are presented. The radio frequency (RF) amplitude and phase responses of multi-order intensity differentiations are characterized, and system demonstrations of real-time differentiations for Gaussian input signal are also performed. The experimental results show good agreement with theory, confirming the effectiveness of our approach.

scholarly journals Design of High Performance Modified Wave pipelined DAA Filter with Critical Path Approach

2012 ◽  
pp. 78-82
Author(s):  
Charanjit Singh ◽  
Balwinder Singh
Keyword(s):  
High Speed ◽  
High Performance ◽  
Critical Path ◽  
Fir Filter ◽  
Control Circuit ◽  
Path Delay ◽  
Clock Skew ◽  
Wide Range ◽  
Wave Pipelining ◽  
The Cost

In this paper, a new high speed control circuit is proposed which will act as a critical path for the data which will go from input to output to improve the performance of wave pipelining circuits The wave pipelining is a method of high performance circuit designs which implements pipelining in logic without the use of intermediate registers. Wave pipelining has been widely used in the past few years with a great deal of significant features in technology and applications. It has the ability to improve speed, efficiency, economy in every aspect which it presents. Wave pipelining is being used in wide range of applications like digital filters, network routers, multipliers, fast convolvers, MODEMs, image processing, control systems, radars and many others. In previous work, the operating speed of the wave-pipelined circuit can be increased by the following three tasks: adjustment of the clock period, clock skew and equalization of path delays. The path-delay equalization task can be done theoretically, but the real challenge is to accomplish it in the presence of various different delays. So, the main objective of this paper is to solve the path delay equalization problem by inserting the control circuit in wave pipelined based circuit which will act as critical path for the data that moves from input to output. The proposed technique is evaluated for DSP applications by designing 4- tap FIR filter using Distributed arithmetic algorithm (DAA). Then comparison of this design is done with 4-tap FIR filter designs using conventional pipelining and non pipelining. The synthesis and simulation results based on Xilinx ISE Navigator 12.3 shows that wave pipelined DAA based filter is faster by a factor of 1.43 compared to non pipelined one and the conventional pipelined filter is faster than non pipelined by factor of 1.61 but at the cost of increased logic utilization by 200 %. So, the wave-pipelined DA filters designed with the proposed control circuit can operate at higher frequency than that of non-pipelined but less than that of pipelined. The gain in speed in pipelined compared to that of wavepipelined is at the cost of increased area and more dissipated power. When latency is considered, wavepipelined design filters with the proposed scheme are having the lowest latency among three schemes designed.

scholarly journals Multi-Physics and Multi-Objective Optimization of a High Speed PMSM for High Performance Applications

2018 ◽  
Vol 54 (11) ◽  
pp. 1-5 ◽  
Author(s):  
Weiduo Zhao ◽  
Xuejiao Wang ◽  
Chris Gerada ◽  
He Zhang ◽  
Chuan Liu ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
Multi Objective Optimization ◽  
Multi Objective

scholarly journals Methods for implementing the Kuznyechik algorithm on FPGAs

2018 ◽  
Vol 28 (3) ◽  
pp. 64-70
Author(s):  
I. I. Kalistru ◽  
M. A. Borodin ◽  
A. S. Rybkin ◽  
R. A. Gladko
Keyword(s):  
Data Processing ◽  
Linear Transformation ◽  
Data Transmission ◽  
High Speed ◽  
High Performance ◽  
Hardware Implementation ◽  
Block Cipher ◽  
Fpga Implementation ◽  
Is Implementation ◽  
The Cost

Increased volumes and speed of data transmission over computer networks, and also the need to protect the transmitted data, require accordingly to increase the speed of cryptographic data processing. One of the ways to achieve high performance is implementation of FPGAs-based cryptographic equipment. Therewith, to cut the cost of equipment, it is important that encryption modules shall consume a minimum possible hardware resources. The work aims to find the most compact high-speed solution for FPGA-based Kuznyechik block cipher. Several methods for hardware implementation of linear transformation, which is used in Kuznyechik cipher, have been reviewed. Various aspects of implementation of these methods taking into account the architecture of target FPGAs are investigated. We also consider aspects of the FPGA implementation of nonlinear transformation, which is used in Kuznyechik block cipher. Resource consumption by various implemented solutions of linear transformation has been estimated. A relatively compact high-speed implemented solution of Kuznyechik block cipher has been obtained and tested on the real equipment. The achieved values of speed for iterative and fully pipelined implementations of the algorithm have been presented.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

1989 ◽  
Vol 47 ◽  
pp. 56-57
Author(s):  
Marc H. Peeters ◽  
Max T. Otten
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
Functional Integration ◽  
Energy Dispersive ◽  
X Rays ◽  
X Ray ◽  
High Speed Analysis ◽  
Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

The bright future of digital imaging in scanning electron microscopy

1993 ◽  
Vol 51 ◽  
pp. 768-769
Author(s):  
M. T. Postek ◽  
A. E. Vladar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Digital Imaging ◽  
High Speed ◽  
High Performance ◽  
Mass Storage ◽  
Analog To Digital ◽  
Central Processing ◽  
Digital Imaging Technology ◽  
Scanning Electron

One of the major advancements applied to scanning electron microscopy (SEM) during the past 10 years has been the development and application of digital imaging technology. Advancements in technology, notably the availability of less expensive, high-density memory chips and the development of high speed analog-to-digital converters, mass storage and high performance central processing units have fostered this revolution. Today, most modern SEM instruments have digital electronics as a standard feature. These instruments, generally have 8 bit or 256 gray levels with, at least, 512 × 512 pixel density operating at TV rate. In addition, current slow-scan commercial frame-grabber cards, directly applicable to the SEM, can have upwards of 12-14 bit lateral resolution permitting image acquisition at 4096 × 4096 resolution or greater. The two major categories of SEM systems to which digital technology have been applied are:In the analog SEM system the scan generator is normally operated in an analog manner and the image is displayed in an analog or "slow scan" mode.

Fuzzy multi-objective location and routing problem

2020 ◽  
Vol 39 (3) ◽  
pp. 3259-3273
Author(s):  
Nasser Shahsavari-Pour ◽  
Najmeh Bahram-Pour ◽  
Mojde Kazemi
Keyword(s):  
Firefly Algorithm ◽  
High Reliability ◽  
Research Area ◽  
Nsga Ii ◽  
Location Routing Problem ◽  
Routing Problem ◽  
Location Allocation ◽  
Multi Objective ◽  
Location Routing ◽  
The Cost

The location-routing problem is a research area that simultaneously solves location-allocation and vehicle routing issues. It is critical to delivering emergency goods to customers with high reliability. In this paper, reliability in location and routing problems was considered as the probability of failure in depots, vehicles, and routs. The problem has two objectives, minimizing the cost and maximizing the reliability, the latter expressed by minimizing the expected cost of failure. First, a mathematical model of the problem was presented and due to its NP-hard nature, it was solved by a meta-heuristic approach using a NSGA-II algorithm and a discrete multi-objective firefly algorithm. The efficiency of these algorithms was studied through a complete set of examples and it was found that the multi-objective discrete firefly algorithm has a better Diversification Metric (DM) index; the Mean Ideal Distance (MID) and Spacing Metric (SM) indexes are only suitable for small to medium problems, losing their effectiveness for big problems.

ANALISA PERBANDINGAN DALAM RANGKA PEMILIHAN BEBERAPA IP UPSTREAM PROVIDER DI PT. INDOSAT

2018 ◽  
Vol 4 (1) ◽  
pp. 57
Author(s):  
Yuli Anwar ◽  
Dahlar .
Keyword(s):  
Business Strategy ◽  
High Speed ◽  
Human Life ◽  
Sustainable Growth ◽  
The Internet ◽  
Network Service Provider ◽  
High Speed Data ◽  
Telecommunications Services ◽  
The Cost ◽  
Internet Network

Abstract. One of the advances in information technology that now has changed the outlook and human life, business process and business strategy of an institution is the internet. The internet is a very large networks that connected to computers and serves throughout the world in one centralized network. With the internet we can access data and information anytime and anywhere.    As one provider of high-speed data communications services and the pioneer of the internet network service provider in Indonesia that provides integrated services, as well as one of the pioneer development of internet services that provide extensive services in the building and apply it throughout Indonesia. Indosat ready to seize opportunities for sustainable growth of business spectrum are still sprawling Indonesia.    Therefore, Indosat continues to focus on the development of increased efforts to provide the best service for customers of Indosat. Indosat will continue to develop and expand network coverage and a larger investment that the company will achieve excellence in the field of integrated telecommunications services.    Ranking by region of the IP Providers can be seen by grouping IP Providers, and management over IP Providers prefer to choose providers based on where it orginates as an example for the region of the U.S if it will be preferred providers that come from U.S. providers.With the commencement of the internet network optimization start early in 2008 with the selection of the appropriate IP Upstream Provider criteria, it is up to date according to data obtained from Indosat, seen any significant changes to the cost of purchasing capacity of the IP Upstream.    Based on the data obtained that until Q3 or September 2008, the number of IP Upstream Providers that previously there were 20 to 10 IP Upstream Provider, IP Transit Price total decrease of 11% to the price of IP Transit Price / Mbps there is a decrease of 78%, while from the capacity bandwith an increase of 301% capacity from 2008.

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