scholarly journals A PROGRAMMABLE IRREGULAR WAVE GENERATOR

1974 ◽  
Vol 1 (14) ◽  
pp. 18 ◽  
Author(s):  
Norman B. Webber ◽  
Colin D. Christian
Keyword(s):  
Low Cost ◽  
Irregular Wave ◽  
Design Considerations ◽  
Wave Generator

An account is given of the various design considerations in the development of a low-cost programmable wave generator for a laboratory channel. The ability of this equipment to reproduce prototype spectra is critically discussed.

scholarly journals Design Considerations and Selection of Cost-Effective Switched Reluctance Drive for Radiator Cooling Fans

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 917
Author(s):  
Ickjin Son ◽  
Grace Firsta Lukman ◽  
Mazahir Hussain Shah ◽  
Kwang-Il Jeong ◽  
Jin-Woo Ahn
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
Magnetic Characteristics ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Design Considerations ◽  
Cooling Fan ◽  
Cooling Fans ◽  
Power Switches ◽  
Selection Of

Switched reluctance motors (SRMs) are simple in structure, easy to manufacture, magnet-less, brushless, and highly robust compared to other AC motors which makes them a good option for applications that operate in harsh environment. However, the motor has non-linear magnetic characteristics, and it comes with various pole-phase combinations and circuit topologies that causes many difficulties in deciding on which type to choose. In this paper, the viability of SRM as a low-cost, rugged machine for vehicle radiator cooling fan is considered. First, necessary design considerations are presented, then three commonly use types of SRM are analyzed: A 3-phase 6/4, 3-phase 12/8, and a 4-phase 8/6 to find their static and dynamic characteristics so the most suitable type can be selected. Simulation results show that the 8/6 SRM produces the highest efficiency with less phase current which reduces the converter burden. However, with asymmetric half bridge converter, eight power switches are required for 8/6 SRM and thus put a burden on the overall drive cost. As a solution, the Miller converter with only six switches for four phase SRM. To verify the proposed idea, the 8/6 SRM was manufactured and tested. The results show that Miller converter can be used for the proposed SRM with slightly reduced efficiency at 80.4%.

scholarly journals Loop-Type Wave-Generation Method for Generating Wind Waves under Long-Fetch Conditions

2017 ◽  
Vol 34 (10) ◽  
pp. 2129-2139 ◽  
Author(s):  
Naohisa Takagaki ◽  
Satoru Komori ◽  
Mizuki Ishida ◽  
Koji Iwano ◽  
Ryoichi Kurose ◽  
...  
Keyword(s):  
Wind Wave ◽  
Wind Waves ◽  
Peak Frequency ◽  
Wave Generation ◽  
New Wave ◽  
Wave Tank ◽  
Irregular Wave ◽  
Wind Speeds ◽  
Type Wave ◽  
Wave Generator

AbstractIt is important to develop a wave-generation method for extending the fetch in laboratory experiments, because previous laboratory studies were limited to the fetch shorter than several dozen meters. A new wave-generation method is proposed for generating wind waves under long-fetch conditions in a wind-wave tank, using a programmable irregular-wave generator. This new method is named a loop-type wave-generation method (LTWGM), because the waves with wave characteristics close to the wind waves measured at the end of the tank are reproduced at the entrance of the tank by the programmable irregular-wave generator and the mechanical wave generation is repeated at the entrance in order to increase the fetch. Water-level fluctuation is measured at both normal and extremely high wind speeds using resistance-type wave gauges. The results show that, at both wind speeds, LTWGM can produce wind waves with long fetches exceeding the length of the wind-wave tank. It is observed that the spectrum of wind waves with a long fetch reproduced by a wave generator is consistent with that of pure wind-driven waves without a wave generator. The fetch laws between the significant wave height and the peak frequency are also confirmed for the wind waves under long-fetch conditions. This implies that the ideal wind waves under long-fetch conditions can be reproduced using LTWGM with the programmable irregular-wave generator.

Intelligent product manuals

2000 ◽  
Vol 214 (5) ◽  
pp. 411-419 ◽  
Author(s):  
D T Pham ◽  
S S Dimov ◽  
B J Peat
Keyword(s):  
Selection Criteria ◽  
Low Cost ◽  
General Design ◽  
Design Considerations ◽  
Knowledge Based ◽  
Operation And Maintenance ◽  
Support Costs ◽  
Intelligent Product ◽  
The Creation ◽  
Active Assistance

Intelligent product manuals are designed to allow product users to utilize a product as easily, effectively and with as little additional care as possible while minimizing support costs for manufacturers and suppliers. It is first shown how intelligent product manuals address these objectives by utilizing electronic, multimedia and knowledge-based technologies to provide active assistance to the user of the product during tasks such as installation, operation and maintenance. An architecture for the creation and deployment of an intelligent product manual is then proposed and general design considerations are outlined. Finally, four implementation approaches, based on XML, SGML, HTML and PDF technologies, are compared against a set of selection criteria. It is concluded that simple, low-cost solutions are available, which can provide significant benefits for appropriate businesses, including smaller companies.

A low-cost dual-slope triangular/square wave generator

2004 ◽  
Vol 91 (3) ◽  
pp. 185-190 ◽  
Author(s):  
Muhammad Taher Abuelma'atti ◽  
Munir Kulaib Alabsi
Keyword(s):  
Low Cost ◽  
Square Wave ◽  
Wave Generator ◽  
Square Wave Generator

scholarly journals A LOW COST PRESSURE WAVE GENERATOR USING DIAPHRAGMS

2008 ◽  
Author(s):  
A. J. Caughley ◽  
D. J. Haywood ◽  
C. Wang ◽  
J. G. Weisend ◽  
John Barclay ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Low Cost ◽  
Wave Generator

Design considerations for the hot embossing of microstrip antennas on plastic foils

2009 ◽  
Vol 1 (4) ◽  
pp. 249-254
Author(s):  
Andreas Kilian ◽  
Michael Fuchs ◽  
Lorenz-Peter Schmidt
Keyword(s):  
Millimeter Wave ◽  
Low Cost ◽  
Three Dimensional ◽  
Hot Embossing ◽  
Microstrip Antennas ◽  
Design Guidelines ◽  
Printed Antennas ◽  
Design Considerations ◽  
Radar Applications ◽  
Plastic Parts

In this contribution, fundamental design considerations for a novel metallization technique to realize millimeter-wave microstrip structures are presented. This hot embossing technology is a fast and economic process originating from the production of three-dimensional molded interconnect devices. Conductive structures are coated onto plastic parts or plastic foils using a heated stamp. This approach shows high potential and therefore will be investigated for the fabrication of low-cost printed antennas at millimeter-wave frequencies. The focus of this contribution is on design guidelines considering process parameters and interactions with substrate and copper foil characteristics derived from the fabrication and measurement of single microstrip patch antenna prototypes for radar applications in the industrial, scientific and medical (ISM) band at 24 GHz. Far-reaching potential lies in the utilization of the three-dimensional manufacturing technology for the construction of conformal integrated antenna systems based on the thermoforming capabilities of polymer substrates.

scholarly journals Design Considerations of Lightweight Block Ciphers for Low-Cost Embedded Devices

2019 ◽  
Vol 8 (2) ◽  
pp. 171-176
Keyword(s):  
Internal Structure ◽  
Low Cost ◽  
Resource Constraint ◽  
Fast Diffusion ◽  
Code Size ◽  
Embedded Devices ◽  
Design Considerations ◽  
Resource Requirements ◽  
Lightweight Cipher ◽  
Smart Computing

In the 21st century, Internet of Things (IoT) has become pivotal technology and has attracted worldwide attention in the smart computing environment. In order to enjoy the benefits of this new environment, security is considered as the main aspect in constrained end nodes. Ordinary cryptographic solutions are not sufficient for resource constraint devices. To fulfill this gap, a relatively new field of cryptography called lightweight cryptography came into existence. Furthermore, designing lightweight ciphers especially software oriented poses some significant limits and inherent conditions. Some design considerations of a lightweight encryption algorithm and tradeoffs for minimizing resource requirements are presented in this paper. Also, for a cipher, it is necessary to provide strong resistance against attacks. In this paper different countermeasures to prevent from attacks is also presented. By considering the performance-enhancing ideas presented in this paper, a new GFN based lightweight block cipher is proposed. A cipher design has two main parts; internal structure and key schedule. The internal structure of the proposed design has three layers in which operations are so arranged that it utilizes small code size and has fast diffusion. Besides, design of newly proposed cipher is such that it thwarts the effect of most of the attacks. In the nutshell, this paper serves as a base for designing good lightweight cipher for resource constraint smart IOT environment.

Design considerations, analysis, and application of a low-cost, fully portable, wearable polymer optical fiber curvature sensor

2018 ◽  
Vol 57 (24) ◽  
pp. 6927 ◽  
Author(s):  
Arnaldo G. Leal-Junior ◽  
Anselmo Frizera ◽  
Leticia M. Avellar ◽  
Maria José Pontes
Keyword(s):  
Optical Fiber ◽  
Low Cost ◽  
Polymer Optical Fiber ◽  
Design Considerations ◽  
Curvature Sensor
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