Performance enhancement for piezoresistive microaccelerometer by geometrical design: a focused review

Sensor Review ◽  
2015 ◽  
Vol 35 (3) ◽  
pp. 310-318 ◽  
Author(s):  
Yan Liu ◽  
Hai Wang ◽  
Hongbo Qin ◽  
Yongqiang Xie
Keyword(s):  
Resonant Frequency ◽  
Design Methodology ◽  
Performance Enhancement ◽  
Performance Parameters ◽  
Content Type ◽  
Geometrical Design ◽  
Working Principle ◽  
Cross Axis

Purpose – This paper aims to provide a focused review on the geometrical designs for performance enhancement of piezoresistive microaccelerometers. Design/methodology/approach – By analyzing working principle and conventional geometries, the improved research proposals are sorted into three groups in terms of their anticipated objectives, including sensitivity, resonant frequency and cross-axis sensitivity. Accessible methods are outlined and their merits and demerits are described. Findings – Novel geometries obviously enhance the performance of accelerometers, and the efficacy can be further elevated by newer materials and fabrication processes. Research limitations/implications – This paper mainly focused on the improved geometrical designs for sensitivity, resonant frequency and cross-axis sensitivity. Other performance parameters or design schemes are not included in this paper. Originality/value – This paper generalizes the available geometries and methods for the enhancement of sensitivity, resonant frequency and cross-axis sensitivity in piezoresistive accelerometers design.

Advances in the smart materials applications in the aerospace industries

2020 ◽  
Vol 92 (7) ◽  
pp. 1027-1035 ◽  
Author(s):  
Al Arsh Basheer
Keyword(s):  
Smart Materials ◽  
Design Methodology ◽  
Extensive Study ◽  
Future Perspectives ◽  
Intelligent Materials ◽  
Content Type ◽  
Recent Developments ◽  
Long Time ◽  
Working Principle ◽  
Online Library

Purpose Smart materials also called intelligent materials are gaining importance continuously in many industries including aerospace one. It is because of the unique features of these materials such as self-sensing, self-adaptability, memory capabilities and manifold functions. For a long time, there is no review of smart materials. Therefore, it is considered worthwhile to write a review on this subject. Design/methodology/approach A thorough search of the literature was carried out through SciFinder, ScienceDirect, SpringerLink, Wiley Online Library and reputed and peer-reviewed journals. The literature was critically analyzed and a review was written. Findings This study describes the advances in smart materials concerning their applications in aerospace industries. The classification, working principle and recent developments (nano-smart materials) of smart materials are discussed. Besides, the future perspectives of these materials are also highlighted. Much research has not been done in this area, which needs more extensive study. Originality/value Certainly, this study will be highly useful for academicians, researchers and technocrats working in aerospace industries.

Behaviour of two-lobe hole-entry hybrid journal bearing system under the combined influence of textured surface and micropolar lubricant

2017 ◽  
Vol 69 (6) ◽  
pp. 844-862 ◽  
Author(s):  
Chandra B. Khatri ◽  
Satish C. Sharma
Keyword(s):  
Design Methodology ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Numerical Technique ◽  
Surface Texturing ◽  
Textured Surface ◽  
Performance Parameters ◽  
Content Type ◽  
Fluid Theory ◽  
Bearing System

Purpose The aim of the present paper is to study the combined influence of textured surface and micropolar lubricant behaviour on the performance of two-lobe hole-entry hybrid journal bearing system. The bearing performance parameters of the textured circular/two-lobe hole-entry hybrid journal bearing system have been computed against the constant vertical external load supported by the bearing. Design/methodology/approach In this work, Eringen’s micropolar fluid theory has been used to derive the governing Reynolds equation. The consequent solution of the governing Reynolds equation has been obtained by using finite element method (FEM) numerical technique. Findings The present study indicates that the use of the textured surface, two-lobe profile of bearing and micropolar lubricant, significantly enhances the bearing performance as compared to non-textured circular journal bearing. Originality/value The present study concerning the influence of surface texturing on the behaviour of the two-lobe hole-entry hybrid journal bearing lubricated with micropolar lubricant is original. The theoretically simulated results of the present study will be useful to design an efficient journal bearing system.

Evaluation of thiol-ene photo-curable resins using in rapid prototyping

2016 ◽  
Vol 22 (3) ◽  
pp. 465-473 ◽  
Author(s):  
Jian Zhou ◽  
Qiuyu Zhang ◽  
Hepeng Zhang ◽  
Jiaojun Tan ◽  
Shaojie Chen ◽  
...  
Keyword(s):  
Free Radical ◽  
Design Methodology ◽  
Volume Shrinkage ◽  
Performance Parameters ◽  
Elongation At Break ◽  
Content Type ◽  
Photosensitive Resin ◽  
Lower Volume ◽  
Function Group ◽  
Tension Strength

Purpose The purpose of this paper is to evaluate the properties of several thiol-acrylate photosensitive systems and compare with corresponding acrylate free-radical systems. The potential stereolithography applications of thiol–ene photosensitive systems are also discussed. Design/methodology/approach In the both thiol–ene and acrylate free-radical photosensitive systems, various key performances were characterized. The function group conversions were characterized by real-time Fourier transform infrared spectroscopy. The tension strength was determined according to the standard ASTM D638-2003, the flexible strength was determined according to ASTM D790-07 and the hardness was measured according to ASTM D2240-05. The volume shrinkage was measured by dilatometer method. The glass transition temperature was analyzed by differential scanning calorimeter. Findings As adding mercapto propionates into acrylate system, the inhibition of polymerization by oxygen was controlled and the flexible performance was improved. In addition, the photosensitive resin showed better tension strength, higher elongation at break and lower volume shrinkage. Among the four mercapto propionates, rigid TEMPIC showed most obvious affect, followed hexa-functional DPMP, tetra-functional PETMP and tri-functional TMMP. Originality/value Although the thiol–ene photosensitive resin has unmatched advantages in performance, there are no reports on the thiol–ene photosensitive resin in the stereolithography application. In this study, thiol–ene photopolymerization material was first tentatively implemented in stereolithography area. Several critical performance parameters were compared between thiol–ene and acrylate free-radical photosensitive systems.

Influence of the cavities on the PCB mechanical properties

Circuit World ◽  
2015 ◽  
Vol 41 (2) ◽  
pp. 76-79
Author(s):  
Boleslav Psota ◽  
Alexandr Otáhal ◽  
Ivan Szendiuch
Keyword(s):  
Mechanical Properties ◽  
Resonant Frequency ◽  
Design Methodology ◽  
Printed Circuit Boards ◽  
Measured Data ◽  
Circuit Boards ◽  
Frequency Range ◽  
Content Type ◽  
Printed Circuit ◽  
Acceleration Amplitude

Purpose – The main aim of this paper is to investigate the influence of the cavity coverage on the printed circuit boards (PCB) to the resonant frequency, acceleration and displacement. Design/methodology/approach – Tests were realized on four PCBs with different cavity areas. Frequency range of tests was between 10 and 2,000 Hz with 0.3 g acceleration amplitude. In addition, more simulations were performed to check different setups of the boards. Findings – From the calculated and measured data, it is clear that with the larger cavity area the resonance frequency drops. In case a greater number of components placed in cavities are needed on board, it is appropriate to use multiple smaller cavities than the bigger ones. Originality/value – Results in this paper could be very useful for PCB manufacturers and designers during designing of the new PCBs with cavities for dipped components.

scholarly journals Measurement of port performance from users’ perspective

2019 ◽  
Vol 4 (2) ◽  
pp. 130-150 ◽  
Author(s):  
George K. Vaggelas
Keyword(s):  
Design Methodology ◽  
Gap Analysis ◽  
Point Of View ◽  
Performance Parameters ◽  
Content Type ◽  
Port Authorities ◽  
New Process ◽  
Specific Performance ◽  
Evaluation Mechanism ◽  
Practical Implications

Purpose Going beyond the usual approach of measuring port performance – focusing on the efficiency of port operations – this paper aims to look into shipping lines and other port users’ perceptions on port performance. Design/methodology/approach The paper develops a framework measuring the perceptions of port users (i.e. shipping companies, shippers, etc.) on port performance. A typology of elements that shape port users’ perceptions has been developed with an eye on capturing the peculiarities of different port markets. Based on this typology, a tool to assess users’ perspectives, and subsequently evaluate, any given port has been developed. The tool provides port authorities the flexibility they need for customized approaches. The developed evaluation mechanism has been tested on a group of European seaports, and the results are presented by this study. Findings The framework and its pilot application unveil the key parameters that port users take into consideration when evaluating the effectiveness component of port performance. Moreover, the importance and evaluation ratings of specific performance parameters allow for a GAP analysis of the collected data. Research limitations/implications The paper advances scholarly and practical discussion on how of port users’ perceptions can be a valuable tool for port performance measurement. Practical implications The proposed tool can be a valuable add-on for port authorities to evaluate their performance from the port users’ point of view and take the necessary actions to improve it. Also, the tool can be used for the evaluation of a new process, infrastructure. The evaluation of port users’ perception of port performance can and must be part of a European ports observatory, as it is a set of indicators that clearly reflects the satisfaction of port users by engaging their view on port performance issues, instead of relying almost exclusively on port-generated data. Originality/value The paper develops a framework for measuring port user’s perception on port performance, which is flexible and can be applied in any port.

Researching into the methodology for the evaluation of deformed soft furniture upholstery

2013 ◽  
Vol 25 (1) ◽  
pp. 59-69
Author(s):  
Milda Jucienė ◽  
Jonas Vobolis
Keyword(s):  
Resonant Frequency ◽  
Design Methodology ◽  
Soft Part ◽  
Cutting Process ◽  
Test Results ◽  
Resonant Vibrations ◽  
Content Type ◽  
Manufacturing Defects ◽  
Different Parts

PurposeThe purpose of this paper is to evaluate upholstery deformation by using resonant vibrations of separate zones of the soft part.Design/methodology/approachBy recording the value of resonant frequency at separate points of the plane, it becomes possible to obtain the graph of deformation distribution. It is compared to the graph that demonstrates how rigidity distributes itself in different directions within the upholstery fabric. This enables the evaluation of unevenness of upholstery deformation that is present in different directions.FindingsThe provided methodology allows assessing the quality of soft furniture assembly and predicting the exploitation time for its upholstery.Originality/valueThe test results obtained using the original methodology enable the assessment of manufacturing defects existing in various directions (for example, the shape of different parts during the cutting process, the unevenness of seam width and others), as well as the quality of furniture during the production and exploitation process.

The effect of aggregating multivariate performance parameters in a quality award process

2014 ◽  
Vol 31 (6) ◽  
pp. 618-628 ◽  
Author(s):  
Birhanu Beshah
Keyword(s):  
Design Methodology ◽  
Evaluation Process ◽  
Study Groups ◽  
Individual Performance ◽  
Performance Parameters ◽  
Content Type ◽  
Alternative Approach ◽  
Quality Awards ◽  
Quality Award ◽  
Practical Implications

Purpose – Quality awards, commonly, have basic criteria and sub-criteria to evaluate applicants based on the quality management principles and philosophies. The purpose of this paper is to examine the method of selecting award winners and its consequences. Design/methodology/approach – Award winners’ and non-award winners’ performances of the Ethiopian Quality Award are the study groups. The criteria and sub-criteria evaluation results of the award were collected and analysed by the Mahalanobis-Taguchi System. Findings – The research assumed that award winners’ performances are exceptionally outstanding. However, the result does not justify the assumption. Hence, the drawback of aggregating multivariate performance measures in a quality award is proven. Mahalanobis distance is proposed as alternative approach to evaluate and select organizations. Practical implications – The outcome of this research will help award givers, evaluators and participants to understand the real difficulty to select very few organizations among applicants. Furthermore, it helps to consider the possible error when aggregating individual performance. Originality/value – Aggregating performances is a common practice in quality awards evaluation process but this paper proved its drawback.

Digitalization of aircraft performance nomograms

2018 ◽  
Vol 90 (5) ◽  
pp. 851-857
Author(s):  
Petar D. Mirosavljević ◽  
Đorđe I. Pantović ◽  
Radomir M. Mijailović
Keyword(s):  
Design Methodology ◽  
Aviation Industry ◽  
Performance Parameters ◽  
Mathematical Functions ◽  
Content Type ◽  
Independent Variables ◽  
Several Variables ◽  
Software Production ◽  
Aircraft Performance ◽  
Practical Implications

Purpose The purpose of this paper is to develop a new tool for aircraft performance analysis and optimization. Design/methodology/approach In this paper, the methodology of converting nomogram curves into mathematical functions is presented. Aircraft performance nomograms represent graphical interpretation of influence of several variables on performance such as environmental conditions, runway conditions and aircraft mass. The aircraft performance nomograms are converted in mathematical functions that describe several independent variables’ influence on aircraft performance parameters. To achieve greater accuracy in calculation of aircraft performance parameters, it is necessary to determine mathematical functions presented by dependent variable variations with several independent variables. The method of determining mathematical functions is illustrated on Fokker 100 landing gear extended net climb gradient determination graph. Findings To evaluate model, it was necessary to determine net climb gradient both graphically and analytically using model and compare the results. After solving both analytically and graphically, it was concluded that results are a match. During model evaluation, it was observed that model has a lot of advantages such as it has great precision of calculation, requires less time to calculate results and has minimum error possibility. Practical implications Final result of digitalization of aircraft performance nomograms is software production. The usage of this software can reduce flight planning and aircraft exploitation costs in several different manners. Airliners can produce such a software for those types of aircraft where there is no software provided from aircraft manufacturer. Originality/value Digitalization of aircraft performance nomogram has never been analyzed before, although there is a possibility of this particular methodology implementation in a practical manner in aviation industry.

An evaluation of agile manufacturing initiatives in the Indian manufacturing industry

2019 ◽  
Vol 37 (1) ◽  
pp. 156-187 ◽  
Author(s):  
Rahul Kumar ◽  
Kanwarpreet Singh ◽  
Sanjiv Kumar Jain
Keyword(s):  
Business Performance ◽  
Design Methodology ◽  
Manufacturing Industry ◽  
Performance Enhancement ◽  
Agile Manufacturing ◽  
Survey Questionnaire ◽  
Content Type ◽  
Manufacturing Organizations ◽  
Manufacturing Initiatives ◽  
Insight Into

Purpose The purpose of this paper is to examine the contribution of agile manufacturing (AM) initiatives in the Indian manufacturing industry and their influence on the business performance enhancement. Design/methodology/approach A survey questionnaire was designed to attain the research objectives. The variables included in the questionnaire were adapted from the elaborated literature review and validated through discussion held with practitioners, academicians and the industry experts. AM questionnaire was sent to approximately 500 randomly selected manufacturing organizations in the northern spectrum of India through e-mails and posts, out of which 154 usable responses were received. Findings The study identified that the Indian manufacturing industry has been reasonably successful in improving the business performance by implementing AM initiatives and has successfully reaped the benefits of AM implementation. Originality/value The present work develops an insight into the prevailing AM practices adopted by Indian manufacturing organizations. The study calculated the percent point score for each issue of AM initiative with respect to the Indian manufacturing industry and highlighted its impact on the enhancement of business performance.

Comparing fluid ring and CMG servomechanisms for active control of rigid satellites

2018 ◽  
Vol 90 (6) ◽  
pp. 896-905 ◽  
Author(s):  
Saleh Akbaritabar ◽  
Reza Esmaelzadeh ◽  
Reza Zardashti
Keyword(s):  
Attitude Control ◽  
Design Methodology ◽  
Torque Control ◽  
Performance Parameters ◽  
Attitude Control System ◽  
Content Type ◽  
Control Moment ◽  
Attitude Maneuver ◽  
Control Moment Gyro ◽  
Practical Implications

Purpose This paper aims to describe a novel type of attitude control system (ACS) in different configurations. This servomechanism is compared with control moment gyro (CMG) in significant parameters of performance for ACS of rigid satellite. Design/methodology/approach This new actuator is the fluid containing one or more rings and fluid flow is supplied by pump. The required torque control is obtained by managing fluid angular velocity. The cube-shaped satellite with three rings of fluid in the principle axes is considered for modeling. The satellite is considered rigid and nonlinear dynamics equation is used for it. In addition, the failure of the pyramid-shaped satellite with an additional ring fluid is discussed. Findings The controller model for four fluid rings has more complexity than for three fluid rings. The simulation results illustrated that four fluid rings need less energy for stabilization than three fluid rings. The performance of this type of actuator is compared with CMG. At last, it is demonstrated that performance parameters are improved with fluid ring actuator. Research limitations/implications Fluid ring actuator can be affected by environmental pressure and temperature. Therefore, freezing and boiling temperature of the fluid should be considered in system designation. Practical implications Fluid ring servomechanism can be used as ACS in rigid satellites. This actuator is compared by CMG, the prevalent actuator. It has less displacement attitude maneuver. Originality/value The results provide the feasibility and advantages of using fluid rings as satellite ACS. The quaternion error controller is used for this model to enhance its performance.

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