scholarly journals Enhancement of mobile scissor lifting system for windy environments

2021 ◽  
Vol 40 (2) ◽  
pp. 229-240
Author(s):  
K.E. Jack ◽  
U.A. Essien ◽  
O.S. Bamisaye ◽  
K.O. Paul ◽  
E.E. Ozoemela ◽  
...  
Keyword(s):  
Model Simulation ◽  
Control Unit ◽  
System Stability ◽  
Strong Wind ◽  
Electronic Control ◽  
Development Environment ◽  
Load Range ◽  
The Stability ◽  
Lifting System ◽  
Near Future

This paper focuses on the enhancement of mobile scissor lifting system for windy environments. This study was necessitated in order to address the lack of support arm problem on the mobile scissor lifting system for the strong wind environment such as Minna in Niger State Nigeria. The outstation broadcasting operations in Minna metropolis are usually challenging during windy days as wind often affects the stability and efficiency of the outstation broad-casting platforms. This research employs electronic control circuit to control mechanical hydraulic actuated scissor lifting system in response to variations in wind speed. The mechanical components were designed using solidworks software. The control unit was remodeled using Proteus 8.0 software with the code written in Arduino integrated development environment (IDE). The model simulation results for both electronic and mechanical system reveal the possibility of achieving system stability with the resultant signal fidelity in outstation telecommunication broad-cast within windy areas. The experiment result shows that the system was capable of lifting the telecommunication platform 2 meters high within 20 seconds considering the load range of 500 to 1000 kg. An overload alert mechanism was incorporated to signal the operators of excessive loading. Then, the system automatically deploys its support arms to counter the attendant consequences of the strong wind thereby restoring the stability of the mobile scissor lift. Therefore, the authors conclude that the enhanced mobile scissor lifting system would be deployed in the windy environment for the maximum attainment of stability objectives while physical model from this design should be subsequently fabricated in the near future.

Design and Analysis of Automatic Cutting Robot for Vertical-Pull Glass Pipe

2010 ◽  
Vol 139-141 ◽  
pp. 1597-1600
Author(s):  
Xiu Hua Sui ◽  
De Jun Miao ◽  
Zheng Mao Feng
Keyword(s):  
Open Loop ◽  
System Stability ◽  
Step Response ◽  
Hydraulic Systems ◽  
Performance Requirement ◽  
High Productivity ◽  
Glass Pipe ◽  
Rotation System ◽  
The Stability ◽  
Lifting System

By study on the current domestic cutting technics of vertical-pull glass pipe, in this paper a new and practical design of automatic cutting robot is peoposed. Its motion process is introduced on the basis of performance requirement, and then the overall structure of automatic cutting robot for vertical-pull glass pipe is designed, especially the electro-hydraulic proportional control systems for frame rotation and fuselage lifting. Meanwhile the stability and respond speed of hydraulic systems is well analyzed with matlab software. The results of open-loop bode diagram of the frame rotation system and unit step response diagram of fuselage lifting system indicate that the automatic cutting robot has excellent system stability and respond speed. It can content the requirement of position accuracy, reduce the labor intensity with high productivity and liberate the workers from wicked environment.

Stability Regions of Nonlinear LCL-Filtered Converter with Converter-Current-Feedback Control Without Damping

2018 ◽  
Vol 22 (5) ◽  
pp. 629-639
Author(s):  
Qingyi Wang ◽  
Xuefen Wang ◽  
Min Ding ◽  
Quan Yin ◽  
Haichun Li ◽  
...  
Keyword(s):  
Feedback Control ◽  
Model Simulation ◽  
System Stability ◽  
Nyquist Diagram ◽  
Current Feedback ◽  
Stability Regions ◽  
Transport Delay ◽  
Control Frequency ◽  
Internal Loss ◽  
The Stability

The stability regions of a LCL-filtered converter adopting converter-current-feedback control without damping are analyzed. The nonlinear LCL-filtered model is presented to investigate its influence on the system stability. The stability analysis is performed by means of the Nyquist diagram in s domain. It reveals that three factors have the dominant effects on the system stability, including internal loss of LCL-filtered model, PWM transport delay and controller parameters. The undamped stability boundaries of the system gain calculated by the symmetrical optimum method are obtained. It can be found that stable regions for the nonlinear LCL-filtered system are extended into a continuous region of ratios of LCL filter resonance frequency to control frequency from three distinct regions. Finally, the stable regions are validated by the nonlinear model simulation, and experimental results verify the theoretical analysis.

Stability of Ring-Type MEMS Gyroscopes Subjected to Stochastic Angular Speed Fluctuation

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Samuel F. Asokanthan ◽  
Soroush Arghavan ◽  
Mohamed Bognash
Keyword(s):  
Angular Velocity ◽  
Degrees Of Freedom ◽  
Microelectromechanical Systems ◽  
Damping Ratio ◽  
Operating Conditions ◽  
System Stability ◽  
System Response ◽  
Ring Type ◽  
Mems Gyroscopes ◽  
The Stability

Effect of stochastic fluctuations in angular velocity on the stability of two degrees-of-freedom ring-type microelectromechanical systems (MEMS) gyroscopes is investigated. The governing stochastic differential equations (SDEs) are discretized using the higher-order Milstein scheme in order to numerically predict the system response assuming the fluctuations to be white noise. Simulations via Euler scheme as well as a measure of largest Lyapunov exponents (LLEs) are employed for validation purposes due to lack of similar analytical or experimental data. The response of the gyroscope under different noise fluctuation magnitudes has been computed to ascertain the stability behavior of the system. External noise that affect the gyroscope dynamic behavior typically results from environment factors and the nature of the system operation can be exerted on the system at any frequency range depending on the source. Hence, a parametric study is performed to assess the noise intensity stability threshold for a number of damping ratio values. The stability investigation predicts the form of threshold fluctuation intensity dependence on damping ratio. Under typical gyroscope operating conditions, nominal input angular velocity magnitude and mass mismatch appear to have minimal influence on system stability.

Critical review towards thermal management systems of lithium-ion batteries in electric vehicle with its electronic control unit and assessment tools

2021 ◽  
pp. 095440702098286
Author(s):  
C Kannan ◽  
R Vignesh ◽  
C Karthick ◽  
B Ashok
Keyword(s):  
Lithium Ion Batteries ◽  
Thermal Management ◽  
Electronic Control Unit ◽  
Lithium Ion ◽  
Control Unit ◽  
Assessment Tools ◽  
Electronic Control ◽  
Battery Thermal Management ◽  
Thermal Management System ◽  
Battery Thermal Management System

Lithium-ion batteries are facing difficulties in an aspect of protection towards battery thermal safety issues which leads to performance degradation or thermal runaway. To negate these issues an effective battery thermal management system is absolute pre-requisite to safeguard the lithium-ion batteries. In this context to support the future endeavours and to improvise battery thermal management system (BTMS) design and its operation the article reveals on three aspects through the analysis of scientific literatures. First, this paper collates the present research progress and status of various battery management strategies employed to lithium-ion batteries. Further, to promote stable and efficient BTMS operation as an initiation the extensive attention is paid towards roles of BTMS electronic control unit and also presented the essential functionality need to consider for designing best BTMS control strategy. Finally, elucidates the various unconventional assessment tools can be employed to recognize the suitable thermal management technique and also for establish optimum BTMS operation based on requirements. From the experience of this article additionally delivers some of the research gaps identified and the essential areas need to focus for the development of superior lithium-ion BTMS technology. All the contents reveal in this article will hopefully assist to the design commercially suitable effective BTMS technology especially for electro-mobility application.

Design of Electrostatic Precipitator Power System Based on Auto Disturbance Rejection Controller

2013 ◽  
Vol 846-847 ◽  
pp. 190-194
Author(s):  
Shu Jun Yin ◽  
Xue Ren Li ◽  
Ji Geng Luo
Keyword(s):  
Power Supply ◽  
Disturbance Rejection ◽  
Power Supply System ◽  
Electrostatic Precipitator ◽  
Supply System ◽  
System Stability ◽  
Engineering Practice ◽  
Single Chip ◽  
High Voltage Power Supply ◽  
The Stability

The paper designs a three-phase high voltage power supply system based on active disturbance rejection controller which make single-chip microcomputer ATmega128 as the main control chip and the system improve the stability and control precision of dust removing power. Engineering practice shows that, the DC power supply system has the advantages of convenient operation, high work efficiency, system stability.

scholarly journals Modeling volcanic ash resuspension – application to the 14–18 October 2011 outbreak episode in central Patagonia, Argentina

2014 ◽  
Vol 14 (1) ◽  
pp. 119-133 ◽  
Author(s):  
A. Folch ◽  
L. Mingari ◽  
M. S. Osores ◽  
E. Collini
Keyword(s):  
Air Quality ◽  
Volcanic Ash ◽  
Suspended Particle ◽  
Dust Emission ◽  
Vegetation Coverage ◽  
Weather Research And Forecasting ◽  
Test Case ◽  
Arid Environments ◽  
Strong Wind ◽  
Near Future

Abstract. Volcanic fallout deposits from the June 2011 Cordón Caulle eruption on central Patagonia were remobilized in several occasions months after their emplacement. In particular, during 14–18 October 2011, an intense outbreak episode generated widespread volcanic clouds that were dispersed across Argentina, causing multiple impacts in the environment, affecting the air quality and disrupting airports. Fine ash particles in volcanic fallout deposits can be resuspended under favorable meteorological conditions, particularly during strong wind episodes in arid environments with low soil moisture and poor vegetation coverage. As opposed to eruption-formed ash clouds, modeling of resuspension-formed ash clouds has received little attention. In consequence, there are no emission schemes specially developed and calibrated for resuspended volcanic ash, and few operational products exists to model and forecast the formation and dispersal of resuspension ash clouds. Here we implement three dust emission schemes of increasing complexity in the FALL3D tephra dispersal model and use the 14–18 October 2011 outbreak episode as a model test case. We calibrate the emission schemes and validate the results of the coupled WRF–ARW (Weather Research and Forecasting – Advanced Research WRF)/FALL3D modeling system using satellite imagery and measurements of visibility (a quantity related to total suspended particle concentration at the surface) and particulate matter (PM10) concentration at several meteorological and air quality stations located at Argentina and Uruguay. Our final goal is to test the capability of the modeling system to become, in the near future, an operational forecast product for volcanic ash resuspension events.

scholarly journals Modelling of the Power Interface of the Digital-Physical Hybrid Simulation System of a VSC-HVDC Based on Virtual Resistance Compensation

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 333
Author(s):  
Jian Le ◽  
Hao Zhang ◽  
Cao Wang ◽  
Xingrui Li ◽  
Jiangfeng Zhu
Keyword(s):  
Current Source ◽  
Hybrid Simulation ◽  
Simulation System ◽  
System Stability ◽  
Interface Model ◽  
Simulation Accuracy ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
The Stability ◽  
Stability And Accuracy

To enhance the stability and accuracy of the digital-physical hybrid simulation system of a modular multilevel converter-based high voltage direct current (MMC-HVDC) system, this paper presents an improved power interface modeling algorithm based on ideal transformer method (ITM). By analyzing the stability condition of a hybrid simulation system based on the ITM model, the current of a so-called virtual resistance is added to the control signal of the controlled current source in the digital subsystem, and the stability of the hybrid simulation system with the improved power interface model is analyzed. The value of the virtual resistance is optimized by comprehensively considering system stability and simulation precision. A two-terminal bipolar MMC-HVDC simulation system based on the proposed power interface model is established. The comparisons of the simulation results verify that the proposed method can effectively improve the stability of the hybrid simulation system, and at the same time has the advantages of high simulation accuracy and easy implementation.

scholarly journals Electronic control unit development and emissions evaluation for hydrogen–diesel dual-fuel engines

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881407
Author(s):  
Yasin Karagöz ◽  
Majid Mohammad Sadeghi
Keyword(s):  
Diesel Engines ◽  
Working Condition ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Dual Fuel ◽  
Hydrogen Energy ◽  
Compression Ignition ◽  
Electronic Control ◽  
Fuel System ◽  
Compression Ignition Engines

In this study, it was aimed to operate today’s compression ignition engines easily in dual-fuel mode with a developed electronic control unit. Especially, diesel engines with mechanical fuel system can be easily converted to common-rail fuel system with a developed electronic control unit. Also, with this developed electronic control unit, old technology compression ignition engines can be turned into dual-fuel mode easily. Thus, thanks to the flexibility of engine maps to be loaded into the electronic control unit, diesel engines can conveniently be operated with alternative gas fuels and diesel dual fuel. In particular, hydrogen, an alternative, environmentally friendly, and clean gas fuel, can easily be used with diesel engines by pilot spraying. Software and hardware development of electronic control unit are made, in order to operate a diesel engine with diesel+hydrogen dual fuel. Finally, developed electronic control unit was reviewed on 1500 r/min stable engine speed on different hydrogen energy rates (0%, 15%, 30%, and 45% hydrogen) according to thermic efficiency and emissions (CO, total unburned hydrocarbons, NOx, and smoke), and apart from NOx emissions, a significant improvement has been obtained. There was no increased NOx emission on 15% hydrogen working condition; however, on 45% hydrogen working condition, a dramatic increase arose.

Electronic Control Unit Design of Electronically Controlled Air Suspension (ECAS) for Vehicle Based on Freescale Microcontroller

2014 ◽  
Vol 494-495 ◽  
pp. 242-245
Author(s):  
Xin Qiang Liu ◽  
Tian Yi Yan
Keyword(s):  
Ride Comfort ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Automotive Electronics ◽  
Electronic Control ◽  
Hardware System ◽  
Air Suspension ◽  
Signal Collection ◽  
Basic Ideas ◽  
Electronically Controlled Air Suspension

With the development of automotive electronics industry, the car which has electronically controlled air suspension is gained wide application. we designed an electronic control unit of automobile electronically controlled air suspension system (ECAS) including the hardware system which include the speed signal collection and processing circuit, the solenoid valve drive circuit, the CAN communication design, height detection circuit, Freescale microcontroller etc and the control strategy while propose some the basic ideas, based on Freescale microcontroller, after introducing the composition and the principle of electronically controlled air suspension. The ECAS can improve vehicle fuel economy, ride comfort and traffic-ability.

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