scholarly journals Experimental test stand for development of an opposed-piston engine and initial results

2017 ◽  
Vol 169 (2) ◽  
pp. 76-82
Author(s):  
Jakub KALKE ◽  
Marcin OPALIŃSKI ◽  
Paweł MAZURO
Keyword(s):  
Predictive Model ◽  
Research Work ◽  
Control Unit ◽  
Preliminary Test ◽  
Test Stand ◽  
Software Test ◽  
Diagnostic Model ◽  
Test Bed ◽  
Future Improvement ◽  
Initial Results

The article presents the reason for developing a 0D predictive and diagnostic model for opposed-piston (OP) engines. Firstly, a description of OP engines, together with their most important advantages and challenges are given together with current research work. Secondly, a PAMAR-4 engine characteristic is presented. After that the proposed 0D predictive model is described and compared with the commercially availible software. Test stand with most important sensors and solutions are presented. After that the custom Engine Control Unit software is characterized together with a 0D diagnostic model. Next part discusses specific challenges that still have to be solved. After that the preliminary test bed results are presented and compared to the 0D simulations. Finally, the summary together with possible future improvement of both 0D predictive model and test bed capabilities are given.

scholarly journals A predictive model for early diagnosis of keratoconus

2020 ◽  
Author(s):  
GRACIA CASTRO-LUNA ◽  
ANTONIO PÉREZ-RUEDA
Keyword(s):  
Logistic Regression ◽  
Predictive Model ◽  
Early Stage ◽  
Corneal Thickness ◽  
Binary Logistic Regression ◽  
Cross Sectional Study ◽  
Bivariate Analysis ◽  
Diagnostic Model ◽  
Binary Logistic Regression Model ◽  
Cross Sectional

Abstract Background: The diagnosis of keratoconus in the early stages of the disease is necessary to initiate an early treatment of keratoconus. Furthermore, to avoid possible refractive surgery that could produce ectasias. This study aims to describe the topographic, pachymetric and aberrometry characteristics in patients with keratoconus, subclinical keratoconus and normal corneas. Additionally to propose a diagnostic model of subclinical keratoconus based in binary logistic regression models Methods: The design was a cross-sectional study. It included 205 eyes from 205 patients distributed in 82 normal corneas, 40 early-stage keratoconus and 83 established keratoconus. The rotary Scheimpflug camera (Pentacam® type) analyzed the topographic, pachymetric and aberrometry variables. It performed a descriptive and bivariate analysis of the recorded data. A diagnostic and predictive model of early-stage keratoconus was calculated with the statistically significant variables Results: Statistically significant differences were observed when comparing normal corneas with early-stage keratoconus/ in variables of the vertical asymmetry to 90º and the central corneal thickness. The binary logistic regression model included the minimal corneal thickness, the anterior coma to 90º and posterior coma to 90º. The model properly diagnosed 92% of cases with a sensitivity of 97.59%, specificity 98.78%, accuracy 98.18% and precision 98.78%Conclusions: The differential diagnosis between normal cases and subclinical keratoconus depends on the mínimum corneal thickness, the anterior coma to 90º and the posterior coma to 90º.

scholarly journals Optimization of Scheduling Technique Rooted on Software Test Routines for Embedded Cores using Quality Factor

2020 ◽  
Vol 9 (3) ◽  
pp. 2034-2038
Keyword(s):  
Quality Factor ◽  
Digital Circuits ◽  
Research Work ◽  
Software Test ◽  
Q Factor ◽  
Embedded Cores ◽  
Testing Performance ◽  
Self Test ◽  
Scheduling Technique ◽  
Additional Area

Most of the research work to test the fast processors is carried out using external devices as testers;but it was not technically & financially workable. To fulfill the required performance along with providing efficient functionality, an appropriate testingism must be employed by the digital circuits. The best way is to follow testing as an integral part that is self-test. Conventionally large amount of data was stored in an external tester.But there was a difficulty in at speed testing performance using these external hardware. Hence, Builtin-self-test was invented which verifies failure free nature of circuit under test (CUT) with a test mechanism as a part of system itself. It is observed that, if testing of any hardware is carried out with the help of built-in self test, it increases the requirement of additional area and indirectly responsible for forfeits due to degradation in performance.. If a powerful and power optimized core is to be designed, hardware BIST cannot be afforded due to these limitations. To overcome these disadvantages, a new software based BIST techniques is introduced which relies on software test patterns. Here this paper focuses on rooting of software test routines which works using optimization of scheduling and also a Q- factor is proposed to evaluate the nature of proposed method.

System Description and Test Planning for a Combined Heat and Power (CHP) Plant Composed by a Micro Gas Turbine and an Absorption Chiller / Heater

2001 ◽  
Author(s):  
Stefano Banetta ◽  
Fabrizio Paganucci ◽  
Romano Giglioli
Keyword(s):  
Thermal Power ◽  
Preliminary Test ◽  
Test Bed ◽  
Operational Parameters ◽  
Absorption Chiller ◽  
Test Planning ◽  
Micro Gas Turbine ◽  
Set Up ◽  
Main Components ◽  
Technical Solutions

The paper deals with the set-up and preliminary test-planning of an innovative mini cogeneration plant, in which exhaust gases coming from a 45 kWe rated turbogenerator directly feed an absorption chiller / heater with a 170 kWth chilling and a 160 kWth heating capability. Electric power is partly used on site to satisfy the plant auxiliary systems power demands and partly vectorised to the main building of the Engineering Faculty (15 km from the plant site) through the main electric grid. Thermal power is exploited locally for any season air conditioning of laboratory rooms. The paper describes the plant layout and the technical solutions adopted for installation and diagnostic purposes. This plant has been conceived even as a test-bed for Remote Monitoring (RM) and Plant Condition Monitoring (PCM) techniques development and testing. To this purpose dedicated diagnostics have been set up and mathematical models of all the main components are being developed to perform the identification of their operational parameters (e.g. efficiencies) on the basis of the acquired parameters. These are aimed at obtaining both a correct management of the plant and an early diagnosis of malfunctions to achieve the ability of following an on-condition maintenance philosophy to reduce maintenance costs and outage periods.

scholarly journals Implementation of a grid-tied emergency back-up power supply for medium and low power application

2020 ◽  
Vol 10 (6) ◽  
pp. 6233
Author(s):  
Dhiman Chowdhury ◽  
Mohammad Sharif Miah ◽  
Md. Feroz Hossain ◽  
Uzzal Sarker
Keyword(s):  
Low Power ◽  
Power Supply ◽  
Power Flow ◽  
Cost Allocation ◽  
Pulse Width Modulation ◽  
Research Work ◽  
Electrical Energy ◽  
Economic Feasibility ◽  
Test Bed ◽  
Power Application

Emergency back-up power supply units are necessary in case of grid power shortage, considerably poor regulation and costly establishment of a power system facility. In this regard, power electronic converters based systems emerge as consistent, = properly controlled and inexpensive electrical energy providers. This paper presents an implemented design of a grid-tied emergency back-up power supply for medium and low power applications. There are a rectifier-link boost derived DC-DC battery charging circuit and a 4-switch push-pull power inverter (DC-AC) circuit, which are controlled by pulse width modulation (PWM) signals. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed system and during on-grid situations, battery is charged by an AC-link rectifier-fed boost converter. Charging phenomenon of the battery is controlled by a relay switched protection circuit. Laboratory experiments are carried out extensively for different loads. Power quality assessments along with back-up durations are recorded and analyzed. In addition, a cost allocation affirms the economic feasibility of the proposed framework in case of reasonable consumer applications. The test-bed results corroborate the reliability of the research work.

scholarly journals A predictive model for early diagnosis of keratoconus

2020 ◽  
Author(s):  
GRACIA CASTRO-LUNA ◽  
ANTONIO PÉREZ-RUEDA
Keyword(s):  
Logistic Regression ◽  
Predictive Model ◽  
Corneal Thickness ◽  
Binary Logistic Regression ◽  
Cross Sectional Study ◽  
Bivariate Analysis ◽  
Diagnostic Model ◽  
Binary Logistic Regression Model ◽  
Cross Sectional ◽  
Logistic Regression Models

Abstract Background: The diagnosis of keratoconus in the early stages of the disease is necessary to initiate an early treatment of keratoconus. Furthermore to avoid possible refractive surgery that could produce ectasias. This study aims to describe the topographic, pachymetric and aberrometry characteristics in patients with keratoconus, subclinical keratoconus and normal corneas. Additionally to propose a diagnostic model of subclinical keratoconus based in binary logistic regression models Methods: The design was a cross-sectional study. It included 205 eyes from 205 patients distributed in 82 normal corneas, 40 subclinical keratoconus and 83 established keratoconus The rotary Scheimpflug camera (Pentacam® type) analyzed the topographic, pachymetric and aberrometry variables. It performed a descriptive and bivariate analysis of the recorded data. A diagnostic and predictive model of subclinical keratoconus was calculated with the statistically significant variables Results: Statistically significant differences were observed when comparing normal corneas with subclinical keratoconus/ in variables of the vertical asymmetry to 90º and the central corneal thickness. The binary logistic regression model included the minimal corneal thickness, the anterior coma to 90º and posterior coma to 90º. The model properly diagnosed 92% of cases Conclusions: The differential diagnosis between normal cases and subclinical keratoconus depends on the mínimum corneal thickness, the anterior coma to 90º and the posterior coma to 90º.

scholarly journals An Optimised Traffic Control Scheme with Preference to Emergency Vehicles Leveraging RFID

2021 ◽  
pp. 74-89
Author(s):  
Kenneth Akpado ◽  
Samuel Usoro ◽  
Nneka Ezeani
Keyword(s):  
Control System ◽  
Traffic Control ◽  
Research Work ◽  
Control Points ◽  
Emergency Vehicle ◽  
Test Bed ◽  
Traffic Light ◽  
Emergency Vehicles ◽  
Traffic Control System ◽  
New System

Emergency Vehicles (EV) such as ambulances, fire fighting vehicles, Road safety vehicles and other emergency vehicles encounter delays on their missions at traffic light control points due to traffic jams. The direct consequence of these delays results in unwarranted loss of lives and properties.  This research work proposes and implements an improved traffic control system with preference to emergency vehicles leveraging RFID technology and a novel Dynamic Traffic Sequence Algorithm (DTSA). Atmega 328 was used to actualize the novel DTSA, control the RFID and the entire traffic control system. The distance of RFID signal transmitted by the emergency vehicle was determined by physically measuring the distance of clearer signal obtained at various distances from the test bed. MATLAB was used to plot the response time of the RFID, thereby helping in the choice of RFID used. It was observed at 100 meters distance between the RFID transmitter in the emergency vehicle (EV) and the traffic light system, a clearer signal was obtained. Therefore at 100 meters the emergency vehicle will be detected and the traffic system will reset its normal routine to give right of way to the particular lane that the emergency vehicle is detected. Comparing the old and the new system it was observed that in the new system the EV will be 12minutes faster than the EV in the old system. From the result obtained, the RFID best suited for this application is active RFID. The results obtained proved that the system will effectively mitigate and almost completely eradicate the delay encountered by emergency vehicles at traffic control points.  The system will be deployed in any many cities in Nigeria that have traffic control systems installed.

scholarly journals Variant Design and Fabrication of an Earth Tunneling Machine

2018 ◽  
Vol 3 (3) ◽  
pp. 63
Author(s):  
Obotowo W. Obot ◽  
O. O. Ite ◽  
J. M. Ben
Keyword(s):  
Research Work ◽  
Functional Model ◽  
Control Unit ◽  
Soil Samples ◽  
The Road ◽  
The Earth ◽  
Tunneling Machine ◽  
Machine Base ◽  
Test Result ◽  
Sand Extraction

Earth tunneling machine is an equipment used in drilling tunnels under the road surface for the laying of pipes or cables.  The earth tunneling machine was produced locally using available materials through simple machining and joining processes.  The machine comprised major components like the driving shaft/boring head, the pulling mechanism, the sand extraction system, the control unit, the machine base and housing which were locally produced and assembled.  Using the machine to drill soil samples from Ekpene Ukim- Uruan; Mbiabong – Uyo; Ikot Obiodongo – Ibesikpo; and Anua Obio - Uyo, the strength of soil samples by the California Bearing Ratio (CBT) test at drilling depths was determined to be 0.444 MPa, 0.417 MPa, 0.420 MPa, and 0.458 MPa, respectively.  The test result demonstrates the performance of a functional model earth tunneling machine, thus indicating the realization of the objective of the research work.

scholarly journals Enhancing Data Base Security in Cloud Computing

2020 ◽  
Vol 8 (6) ◽  
pp. 393-397
Keyword(s):  
Cloud Computing ◽  
Information Security ◽  
Distributed Computing ◽  
Research Work ◽  
Significant Issue ◽  
Security Assurance ◽  
Security And Protection ◽  
Business Information ◽  
Future Improvement ◽  
Cloud Condition

Information security has reliably been a significant issue in data innovation. In the distributed computing condition, it turns out to be especially genuine in light of the fact that the distributed is suitable in better places even in all the globe. Distributed and security insurance are the two fundamental components of client's worries about the cloud innovation. Despite the fact that numerous procedures on the themes in distributed computing have been researched in the two ventures, information security and security assurance are getting progressively significant for the future improvement of distributed computing innovation in government, industry, and business. Information security and protection assurance issues are significant to both equipment and programming in the cloud design. This examination is to survey diverse security methods and difficulties from both programming and equipment angles for ensuring information in the cloud and targets upgrading the information security and protection assurance for the dependable cloud condition. In this paper, we make a relative research examination of the current research work with respect to the information security and security assurance procedures utilized in the distributed computing.

Application of control units VAZM-2U in ore grinding

2021 ◽  
pp. 27-32
Author(s):  
A. V. Kuzyakov ◽  
V. D. Zhidovetskiy
Keyword(s):  
Flow Rate ◽  
Research Work ◽  
Physical And Mechanical Properties ◽  
Control Unit ◽  
Active Power ◽  
Maximum Output ◽  
Vibration Level ◽  
Power Draw ◽  
Grinding Circuits ◽  
Spiral Classifier

This paper considers the results of research work aimed at developing control systems to control ore grinding processes that would be compatible with the control unit VAZM-2U developed by Soyuztsvetmetavtomatika. The underlying principle concerning the unit is that grinding of ores with different mineralogical compositions is governed by the same common regularities in correlation between the physical processes that develop in grinding circuits and the defining process parameters. A grinding mill is fed with ore that has varying physical and mechanical properties, and this can lead to accumulation of material in the mill. Indicators of the probable overload condition include mill vibration level and active power draw of the mill drive motor. The point at which the overload condition has arrived is determined by analyzing active power draw and reverse vibration trends. It is demonstrated that a mill overload condition may take place in those time intervals when both the vibration level and the active power draw of the mill motor fall. In this case the VAZM-2U unit calculates a correction command for the ore flow rate regulator, and this way the overload condition is overcome while the ore feed rate returns to the initial value. The VAZM-2U unit can also help reach the maximum output of the overflow product from a spiral classifier avoiding overgrinding, with the finest material being monitored. The unit can also determine the underflow flow rate in the spiral classifier while adjusting this parameter within a given range of allowable values. The underflow flow rate is estimated with the help of an adaptive mathematical model, which can be utilized in closed-loop grinding circuits that include classifiers. The ore grinding control algorithms implemented in the VAZM-2U unit can be modified to be applicable for milling and flotation control.

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