Research on MEMS multi-point exploding metal foil synchronous array

2021 ◽  
pp. 2140018
Author(s):  
Jianhua Chen ◽  
Jiao Li ◽  
Yin Wang ◽  
Wei Ren ◽  
Hui Li
Keyword(s):  
Optimization Design ◽  
Electrical Explosion ◽  
Peak Time ◽  
Metal Foil ◽  
Peak Voltage ◽  
Mems Technology ◽  
Photonic Doppler Velocimetry ◽  
Voltage Peak ◽  
Ideal Process ◽  
The Ideal

Based on MEMS technology, this paper realized the chip preparation of the synchronous initiation array and obtained the ideal process parameters. The MEMS multi-point exploding metal foil synchronous array chip replaces the traditional initiation array composed of electric detonators, and has a greatly reduced volume and could be prepared in batches. By testing the electrical explosion parameters of the array chip, the peak voltage, peak current, peak time and other data of different ignition voltages are obtained. At the same time, we proposed a method to test the synchronization of the array using multi-channel photonic doppler velocimetry, and obtained the synchronization data when the firing voltage was 2500 V and 2800 V, which provided help for the subsequent optimization design.

Parameter study and optimization design of a hat oblique tunnel portal

2021 ◽  
pp. 095440972110140
Author(s):  
Zijian Guo ◽  
Tanghong Liu ◽  
Wenhui Li ◽  
Yutao Xia
Keyword(s):  
High Speed ◽  
Optimization Design ◽  
Pareto Front ◽  
Optimization Problem ◽  
Optimization Method ◽  
Design Parameters ◽  
Parameter Study ◽  
Buffer Structure ◽  
Tunnel Entrance ◽  
The Ideal

The present work focuses on the aerodynamic problems resulting from a high-speed train (HST) passing through a tunnel. Numerical simulations were employed to obtain the numerical results, and they were verified by a moving-model test. Two responses, [Formula: see text] (coefficient of the peak-to-peak pressure of a single fluctuation) and[Formula: see text] (pressure value of micro-pressure wave), were studied with regard to the three building parameters of the portal-hat buffer structure of the tunnel entrance and exit. The MOPSO (multi-objective particle swarm optimization) method was employed to solve the optimization problem in order to find the minimum [Formula: see text] and[Formula: see text]. Results showed that the effects of the three design parameters on [Formula: see text] were not monotonous, and the influences of[Formula: see text] (the oblique angle of the portal) and [Formula: see text] (the height of the hat structure) were more significant than that of[Formula: see text] (the angle between the vertical line of the portal and the hat). Monotonically decreasing responses were found in [Formula: see text] for [Formula: see text] and[Formula: see text]. The Pareto front of [Formula: see text] and[Formula: see text]was obtained. The ideal single-objective optimums for each response located at the ends of the Pareto front had values of 1.0560 for [Formula: see text] and 101.8 Pa for[Formula: see text].

Designing the Ideal Process Analyser—Or at Least Making the Attempt (Continued)

NIR news ◽  
1994 ◽  
Vol 5 (3) ◽  
pp. 7-9 ◽  
Author(s):  
John Coates ◽  
Perkin-Elmer
Keyword(s):  
Ideal Process ◽  
The Ideal

scholarly journals Survey on finger-vein segmentation and authentication

2017 ◽  
Vol 7 (1.2) ◽  
pp. 9 ◽  
Author(s):  
Shwetambari Kharabe ◽  
C. Nalini
Keyword(s):  
Feature Extraction ◽  
Cost Efficiency ◽  
Personal Identification ◽  
Electronic Information ◽  
Basic Principles ◽  
Long Period ◽  
Finger Vein ◽  
Authentication Technique ◽  
Ideal Process ◽  
The Ideal

Exploding growth in the field of electronic information technology, the finger vein authentication technique plays a vibrant role for personal identification and verification. In recent era, this technique is gaining popularity, as it provides a high security and convenience approach for personal authentication. Vein biometrics is an emerging methodologycomparing to other systems, due to its strengths of low forgery risk, aliveness detection and stableness over long period of time. Literatures published based on different techniques used forand authentication process are described and evaluated in this paper. These processes hadgained an outstanding promise in variety of applications and much attention among researchers to provide combine accuracy, universality and cost efficiency. This paper in brief, reviews various approaches used for finger vein segmentation and feature extraction. The reviews are based on finger vein basic principles, image acquisition methodology, pre-processing functions, segmentation, feature extraction,classification, matching and identification procedures, which are analyzed scientifically, thoroughly and comprehensively.Based on the analysis, the ideal process and procedure is identified, which will be an idyllic solution for finger vein authentication.

Design and Comparison of Micro Electromagnetic Vibration Energy Harvesters

2015 ◽  
Vol 645-646 ◽  
pp. 1223-1232
Author(s):  
Yi Ming Lei ◽  
Zhi Yu Wen ◽  
Li Chen
Keyword(s):  
Energy Harvester ◽  
Load Resistance ◽  
Vibration Energy ◽  
Test Results ◽  
Peak Voltage ◽  
Energy Harvesters ◽  
Electromagnetic Vibration ◽  
Mems Technology ◽  
Electromagnetic Energy Harvesting ◽  
Linear Spring

This paper presents two electromagnetic vibration energy harvesters based on micro-electro-mechanical (MEMS) technology. Two prototypes with different vibration structures were designed and fabricated. The energy harvester includes a permanent magnet attached on vibration structure (resonator) made by Si and a fixed wire-wound coil, with the total volume of 0.9 cm3. Two energy harvesters with different resonator are tested and compared. Experiments show that: in the same acceleration and a load resistance, the resonant frequency of prototype B is approximately 95% of prototype A; The peak-peak voltage and the maximum power of prototype B is 1.6 times and 2.7 times of prototype A respectively. The test results was analyzed simply and it indicated that the electromagnetic energy harvesting with the spring B has better performance; also proved that the potential ability of the non-linear spring could extend the frequency bandwidth and improve output voltage.

scholarly journals One hundred kilojoules of energy storage in water wire electric explosion deposition energy study

2021 ◽  
Vol 2087 (1) ◽  
pp. 012006
Author(s):  
Simin Liu ◽  
Yongmin Zhang ◽  
Yong Lu ◽  
Shaojie Zhang
Keyword(s):  
Energy Storage ◽  
Electrical Explosion ◽  
Load Resistance ◽  
Wire Diameter ◽  
Electric Explosion ◽  
Peak Time ◽  
Load Voltage ◽  
Load Power ◽  
The Wire ◽  
Deposition Energy

Abstract In this experiment, the electro-explosive deposition energy in water of aluminum-magnesium welding wire model ER5356 at 100 kJ capacitive storage energy was investigated. The loop current and the load discharge voltage during the wire electrical explosion were measured using a self-integrating Roche coil and a capacitive voltage divider, respectively. The physical process of electrical explosion and the energy deposition process were delineated by the measured loop currents and load voltages. The current waveform and load voltage of the electric explosion in water of 1.2 mm-3.0 mm diameter Al-Mg wire at 100 kJ stored energy were measured; the changes of load resistance value, load power and deposition energy of the wire loaded with electric explosion were calculated. The results show that the peak circuit current and peak time point decrease and then increase with increasing diameter, and the minimum value is achieved at 1.6 mm wire diameter; the load voltage and load resistance values gradually decrease with increasing diameter; the load power and total deposited energy of discharge achieve the maximum value at 2.0 mm diameter. At 100 kJ energy storage, there is an optimal range between 1.6 mm and 2.4 mm wire diameter.

scholarly journals On the Optimal Location and Number of Intercoolers in a Real Compression Process

1988 ◽  
Author(s):  
Peter Vadasz ◽  
Jossef Pugatsch ◽  
Dan Weiner
Keyword(s):  
Optimal Number ◽  
Optimal Location ◽  
Final Decision ◽  
Specific Work ◽  
Compression Process ◽  
Pressure Losses ◽  
Ideal Process ◽  
Partial Criterion ◽  
Economic Criteria ◽  
The Ideal

In this paper the optimal location and number of intercoolers in a real compression process, including pressure losses, is derived by minimizing the compression specific work. Consequently the series of intermediate pressure values where the system intercoolers should be located is evaluated. As a result a solution different from the classical-isothermal compression process is obtained. The ideal process is evaluated and verified as a particular case by assuming no pressure losses. In reality, minimizing the compression work is only a partial criterion of optimization and the final decision regarding the optimal number of intercoolers should be obtained by using techno-economic criteria.

How to Discuss a Paper: Developing and Showcasing Your Scholarly Skills

2014 ◽  
Vol 31 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Kirsten A. Cook ◽  
Matthew Hart ◽  
Michael R. Kinney ◽  
Derek K. Oler
Keyword(s):  
Doctoral Students ◽  
Junior Faculty ◽  
New Faculty ◽  
High Quality ◽  
Ideal Process ◽  
The Ideal

ABSTRACT We offer this paper as a primer for accounting doctoral students and new faculty on how to discuss a paper. We believe that this topic can serve to “jump start” the engagement of students and junior faculty in developing and delivering quality discussions. We begin by emphasizing the importance and benefits of being a good discussant to both the profession and the discussant. We then outline the discussion process and provide detailed suggestions on points to consider in each phase of this process: (1) volunteering to discuss, (2) receiving the discussion assignment, (3) preparing the discussion, (4) presenting the discussion, and (5) following up with the authors after the discussion. Next, we examine data that highlight the need for additional discussant volunteers at conferences. Finally, we present possible innovations to foster high-quality discussions. This paper formalizes the ideal process typically learned through years of mentoring and conference experience.

Analysis and Stress Optimization Design of an S-Shaped Micro Spring

2010 ◽  
Vol 97-101 ◽  
pp. 2500-2504
Author(s):  
Li Shun Li ◽  
Xiang De Meng ◽  
Hong Xun Li
Keyword(s):  
Optimization Design ◽  
Maximum Stress ◽  
Mechanical Performance ◽  
Fem Simulation ◽  
Micro Electro Mechanical System ◽  
The Finite Element Method ◽  
Mems Technology ◽  
Stress Optimization ◽  
The Difference ◽  
Spring Coefficient

The stress distribution of an S-shaped micro spring fabricated by the micro-electro-mechanical-system (MEMS) technology was analyzed by the finite-element method (FEM) using ANSYS software, which showed that the stress concentration is located in the inner corner of the turning round. To reduce the maximum stress but not change the spring coefficient, an optimization S-shaped micro spring with the slope cross section was designed. The width of one end of the turning round is increased from the original 80μm to 100μm, while the other is decreased from 80μm to 21.5μm. The spring coefficient formula of the optimization S-shaped micro spring was calculated out by the Castigliano second law, and the difference between the formula and the FEM is 2.7%. At the same time the FEM simulation shows that the maximum stress of the optimization S-shaped micro spring can be reduced by 32.7% while the spring coefficient is the same comparing with the primary S-shaped micro spring, which shows that the mechanical performance of the optimization S-shaped micro spring is better than that of the primary S-shaped micro spring.

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