scholarly journals Innovative solution of hybrid hydraulic fire wood splitting machine

2021 ◽  
Author(s):  
Davor Biškup ◽  
Mihael Cipek ◽  
Danijel Pavković ◽  
Juraj Karlušić ◽  
Željko Šitum
Keyword(s):  
Operating Performance ◽  
Hybrid Structure ◽  
Additional Energy ◽  
Operating Cycle ◽  
Energy Recuperation ◽  
Hybrid Powertrains ◽  
Innovative Solution ◽  
Simulation Results ◽  
Hydraulic Accumulator ◽  
Fire Wood

Hybrid powertrains have already proven themselves as viable solutions for reducing fuel consumption while maintaining the same operating performance of conventional ones, which is achieved by using an additional energy source in combination with energy recuperation. Many forestry machinery and tools which are intended for field use are hydraulics-based and powered by tractors or skidders. These tools may also be hybridized by incorporating a properly-sized hydraulic accumulator. This paper proposes an innovative solution of hydraulic fire wood splitting machine which uses a hydraulic accumulator in order to increase its efficiency. A simple model of conventional and hybridized machine is developed and presented in this paper. The model is then simulated over a defined operating cycle with realistic loads. Simulation results show that hybrid structure may improve the splitting performance with lower power requirements. Finally, the conventional and hybridized machine performances are compared and discussed.

scholarly journals Effects of Design Parameters on Operating Characteristics of an Electric Assisted Bicycle Using Fuel Cell

2020 ◽  
Vol 12 (11) ◽  
pp. 4684
Author(s):  
Nguyen Ba Hung ◽  
Ocktaeck Lim
Keyword(s):  
Fuel Cell ◽  
Operating Performance ◽  
Simulation Models ◽  
Design Parameters ◽  
Hydrogen Fuel ◽  
Operating Characteristics ◽  
Cell Control ◽  
Electric Bicycle ◽  
Simulation Results ◽  
Number Of Cells

A simulation study was conducted to examine the effects of design parameters on the operation of an electric power-assisted bicycle using fuel cell. Bicycle dynamic, electric motor and fuel cell models were built to depict operation of the electric bicycle. These models were solved by Matlab-Simulink to obtain the operating characteristics of the electric bicycle, such as power of fuel cell, propulsion force, moving distance and velocity. The simulation results in motion were compared to experimental results to validate the simulation models. The effects of the number of cells and hydrogen fuel pressure on the operation of the electric bicycle were investigated. In addition, the influences of slope grade on the operating characteristics of the electric-assisted bicycle and fuel cell were investigated in two cases: without and with fuel cell control. The simulation results show that the operating performance of the electric bicycle was improved when the number of cells was increased. The increase in hydrogen fuel pressure helped to increase the operating performance of the electric bicycle; however, this contribution was not significant. When fuel cell control was applied, the velocity of the electric assisted bicycle could be maintained at a stable value, in spite of changing slope grade.

scholarly journals A regenerative braking energy recuperation from elevator operation in building by active rectifier

2021 ◽  
Vol 12 (2) ◽  
pp. 811
Author(s):  
An Thi Hoai Thu Anh ◽  
Luong Huynh Duc
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Urban Area ◽  
Regenerative Braking ◽  
High Rise ◽  
Active Rectifier ◽  
Energy Recuperation ◽  
Grid Simulation ◽  
Simulation Results ◽  
Active Rectifiers

Elevators- means of vertical transportation to carry people and goods are an indispensable part in offices, high-rise buildings, hospitals, commercial areas, hotels, car-parks when blooming urbanization develops worldwide. However, the level of energy consumption in elevator operation is significant, so energy saving solutions have been outlined and applied in practice. With frequent braking phases, regenerative braking energy is wasted on braking resistors. Therefore, this paper proposes regenerative braking energy recuperation method for elevator operation in building by active rectifiers enabling the braking energy to be fed back into utility grid. Simulation results conducted by MATLAB with data collected from OCT5B building-RESCO new urban area, Ha noi, Vietnam have verified saving energy of using active rectifiers replacing diode rectifiers up to 33%.

Modeling and Testing of Fluidic Flexible Matrix Composite Lead–Lag Dampers

2020 ◽  
Vol 65 (1) ◽  
pp. 1-10
Author(s):  
Matthew J. Krott ◽  
Edward C. Smith ◽  
Christopher D. Rahn
Keyword(s):  
Frequency Response ◽  
Matrix Composite ◽  
Rotor Blade ◽  
System Model ◽  
Response Data ◽  
Model Predictions ◽  
Simulation Results ◽  
Flexible Matrix Composite ◽  
Hydraulic Accumulator ◽  
Lag Dampers

A new lead–lag damper concept using a fluidic flexible matrix composite (F2MC) tube is presented in this paper. A model is developed for an articulated rotor blade integrated with an F2MC damper consisting of an F2MC tube, an inertia track, an orifice, and a hydraulic accumulator. Benchtop tests using a 4.5-ft rotor blade demonstrate the performance of a smallscale F2MC damper. The blade–damper system model predictions are verified by comparing experimentally measured and model-predicted frequency response data. In benchtop tests, the model predicts blade damping ratios of up to 0.34 with the F2MC damper. A simplified articulated blade based on the UH-60 rotor is simulated to assess the feasibility of a full-scale F2MC damper. Simulation results predict that the damper can generate blade damping ratios of over 0.30 at low blade lag angles.

Modeling the Auto-Thermal Performance of a Thermophilic Chalcopyrite Bioleaching Heap Employing Mesophilic and Thermophilic Microbes

2007 ◽  
Vol 20-21 ◽  
pp. 70-74 ◽  
Author(s):  
Javier Vilcáez ◽  
Koichi Suto ◽  
Chihiro Inoue
Keyword(s):  
Energy Supply ◽  
The Other ◽  
Copper Extraction ◽  
Cell Distribution ◽  
Leaching Rate ◽  
Heat Accumulation ◽  
Additional Energy ◽  
Flow Rates ◽  
Physicochemical Factors ◽  
Simulation Results

A model was prepared to study the performance of a thermophilic bioleaching heap that employs mixed mesophilic and thermophilic microbes for copper extraction from CuFeS2. Mesophiles’ preference for and ease of dissolving additional FeS2 provided to the heap enables the transition from a mesophilic to a thermophilic bioleaching state without the necessity of additional energy supply. In this sense, the mathematical description of the bioleaching process is done taking into consideration the dependency of both microbes’ biological states on physicochemical factors such as the temperature and O2 availability. With regard to the flow rates of the liquid and air phases, simulation results have shown that these flow rates govern not just the heat transfer and variation of cell distribution, but also the leaching rate regardless of the fraction of CuFeS2 per FeS2 leached (FCP) which is the other variable influencing to the heat accumulation in the heap.

scholarly journals A Study on the Effects of Plug Shape on Operating Performance of an Electric Pressure Regulator Applied for Gaseous Fueled Vehicles

2021 ◽  
Vol 31 (2) ◽  
pp. 84-91
Keyword(s):  
Dynamic Response ◽  
Mathematical Models ◽  
Electromagnetic Force ◽  
Operating Performance ◽  
Slope Angle ◽  
Symmetric Model ◽  
Two Dimensional ◽  
Pressure Regulator ◽  
Simulation Results ◽  
Electric Pressure

A model-based study was conducted to examine the effects of plug shape on electromagnetic force and dynamic response of an electric pressure regulator (EPR) applied for gaseous fueled vehicles. Mathematical models were established to describe the operation of the EPR, including mechanical and electrical models. A two-dimensional (2D) symmetric model of the EPR was built in Maxwell software to simulate the electromagnetic force under the effects of plug shape. Afterward, the 2D symmetric model of EPR with the electromagnetic force calculated was imported into Simplorer software to simulate the dynamic response of the EPR based on the influence of plug shape. The shape of plug in the EPR was changed through the dimension parameters denoted by dimension (h) and slope angle (). The simulation results show that the electromagnetic force and dynamic response of the EPR can be optimized when h and  are selected at 3mm and 480, respectively.

scholarly journals Performance Analysis of Non-Isolated DC-DC Buck Converter Using Resonant Approach

2018 ◽  
Vol 8 (5) ◽  
pp. 3350-3354 ◽  
Author(s):  
K. Jayaswal ◽  
D. K. Palwalia
Keyword(s):  
Electromagnetic Interference ◽  
Operating Performance ◽  
Operational Reliability ◽  
Buck Converter ◽  
Matlab Simulation ◽  
Soft Switch ◽  
Dc Voltage ◽  
Leakage Inductance ◽  
Switching Losses ◽  
Simulation Results

DC-DC converters preserve or control the output DC voltage. Due to parasitic constituents such as leakage capacitance of both diode and inductor, and transformer leakage inductance, DC-DC converters mostly operate on rigid switching conditions which result in high switching losses. These parasitic constituents affect the dc-dc converter’s operational reliability, instigate electromagnetic interference issues and limit the converter’s operation at higher frequency operations. In this paper, resonant or soft-switch approach has been employed to improve the operating performance and design-oriented principle investigations have been carried out for overcoming the issues of parasitic constituents in 24-12V DC-DC step-down (buck) converter. This paper divulges the analysis and Matlab Simulation results for 24-12V buck converter based on resonant or soft-switching approach.

scholarly journals Municipal waste management on the example of the Municipal Waste Management Company in Olsztyn - a case study

2018 ◽  
Vol 49 ◽  
pp. 00022
Author(s):  
Jolanta Fieducik
Keyword(s):  
Waste Management ◽  
Waste Treatment ◽  
Treatment Plant ◽  
Municipal Waste ◽  
Aerobic Biodegradation ◽  
Additional Energy ◽  
Municipal Waste Management ◽  
Innovative Solution ◽  
Waste Treatment Plant

This article presents the technological processes associated with waste management on the example of the Municipal Waste Treatment Plant in Olsztyn. Legal acts regulating waste management and the maintenance of cleanliness at the municipal level are discussed. The Municipal Waste Treatment Plant in Olsztyn processes waste from 37 municipalities in the Region of Warmia and Mazury. Waste transported to the plant is separated into sorted waste and mixed waste which undergoes further processing. An innovative solution in the country of drying waste mixed in bioreactors, where aerobic biodegradation occurs, was applied in Olsztyn. As a result of the temperature in this process, the waste is dried without additional energy from the outside. Processed waste is used in the production of alternative fuel. Around 5-15% of the collected waste is not fit for processing, and it is landfilled.

A comparative study of a new microscale technique and conventional bending techniques for evaluating the interface adhesion strength in IC metallization systems

2010 ◽  
Vol 25 (10) ◽  
pp. 1917-1928 ◽  
Author(s):  
Shoji Kamiya ◽  
Hiroshi Shimomura ◽  
Masaki Omiya ◽  
Takashi Suzuki
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Interface Crack ◽  
Interface Adhesion ◽  
Additional Energy ◽  
Propagation Behavior ◽  
Four Point Bending ◽  
Simulation Results ◽  
Energy Dissipated ◽  
Crack Propagation Behavior

We developed a new microscale technique for evaluating the local interface adhesion in a thin film stack and we compared it with a conventional four-point bending technique. Using the microscale technique, the interface adhesion was estimated to be 3.0 J/m2 by comparing experimental results with numerical simulation results for interface crack propagation behavior. The four-point bending technique was applied to the same interface and the interface adhesion was estimated to be 4.4 J/m2 by experiment. However, this value is an overestimate because it includes the plastic deformation of epoxy resin used to fabricate the specimens. By eliminating the additional energy dissipated through plastic deformation of the epoxy resin close to the interface crack tip, the interface adhesion was evaluated to be 3.3 J/m2. This value agrees well with that obtained using the microscale technique.

scholarly journals TECHNICAL AND ECONOMIC ASSESSMENT OF THE RECONSTRUCTION OF THREE-PHASE ELECTRIC-ARC STEEL FURNACE

2021 ◽  
Vol 2021 (1) ◽  
pp. 61-67
Author(s):  
V.I. Hudym ◽  
◽  
V.V. Kosovska ◽  
N.P. Yavorska ◽  
T.I. Danko ◽  
...  
Keyword(s):  
Electric Furnace ◽  
Electricity Consumption ◽  
Economic Assessment ◽  
Electric Arc ◽  
Optimal Placement ◽  
Steel Furnace ◽  
Three Phase ◽  
Innovative Solution ◽  
Simulation Results ◽  
Metal Melting

The technological units of electric arc steel remelting are among the most energy-intensive consumers for whom the problem of energy saving is extremely urgent. The proposed reconstruction of the electric-arc steel furnace is aimed at reducing the amount of electricity consumption. The feasibility study makes it possible to assess the technical and economic parameters of project of an electric-arc steel furnace reconstruction. The simulation results of the reconstructed electric furnace showed that due to the optimal placement of electric arcs in the electric furnace space, the duration of the metal melting stage can be reduced by approximately 19 min. Cost-effectiveness calculations for the implementation of the innovative solution showed that reducing the duration of steel remelting in a reconstructed furnace reduces the electricity consumption by approximately 28% per process. The article takes into account only the reduction of electricity consumption, but does not take into account the possibility of improving the productivity of the furnace by increasing the number of technological processes per shift. References 7, figures 3, table 1.

Active Noise Canceling

2011 ◽  
pp. 286-308 ◽  
Author(s):  
Hector Perez-Meana ◽  
Mariko Nakano-Miyatake
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Noise Cancellation ◽  
Hybrid Structure ◽  
Least Square ◽  
Recursive Least Square ◽  
Estimation Algorithms ◽  
Acoustic Feedback ◽  
Active Noise ◽  
Simulation Results

Some of the main problems present in active noise cancellations are the feedback distortion due to the acoustic feedback between the cancellation speaker and the input microphone; the high computational complexity when recursive least square algorithms are used; and the secondary path estimation. This chapter presents a review of some successful solutions to these problems, such as a hybrid structure to reduce the feedback distortion; active noise cancellation (ANC) FxRLS algorithms in which the filter input signal is decomposed into a finite number; and mutually near orthogonal signal components, as well as successful secondary path estimation algorithms. Computer simulation results confirm the desirable properties of presented ANC structures.

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