scholarly journals Designing of the Machine for Cutting Transport Belts: Conceptual Works

2020 ◽  
Vol 14 (3) ◽  
pp. 144-153
Author(s):  
Aashutosh Kale ◽  
Aleksandra Biszczanik ◽  
Krzysztof Wałęsa ◽  
Mateusz Kukla ◽  
Maciej Berdychowski ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Closed Loop ◽  
Subsequent Stage ◽  
Conveyor System ◽  
Plastic Materials ◽  
Cutting Knife ◽  
Belt Conveyors ◽  
Two Stages ◽  
Very High ◽  
High Length

Abstract Belt conveyors are commonly employed in manufacturing and excavation processes. One of the basic components of such equipment are flat transport belts which can be monolithic or composite. In both cases, the belts are most often made of plastic materials. The manufacturing process of flat transport belts usually involves two stages. During the first stage, belts of very high length of up to several hundred meters are manufactured with use of the correct technology for a given belt type. In order to be usable in the finished conveyor system, correct length of such belts is to be achieved. Considering the above, the subsequent stage of manufacturing requires cutting the belts down to the appropriate length and very often joining the ends to form a closed loop with specific circumference. In an attempt to answer the demand of the manufacturing industry, the authors took up design works on an automated device for crosswise cutting of monolithic and composite belts. This article presents three construction concepts of the authors’ own design together with an analysis of construction and operating factors which affect their usability. The presented discussion leads to selecting one of the solutions for which a drive system concept designed by the authors is proposed. Additionally, an analysis of the influence of the cutting knife geometry on cutting force is provided.

scholarly journals Portable DC Supply Based on SiC Power Devices for High-Voltage Marx Generator

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 313
Author(s):  
Jacek Rąbkowski ◽  
Andrzej Łasica ◽  
Mariusz Zdanowski ◽  
Grzegorz Wrona ◽  
Jacek Starzyński
Keyword(s):  
High Voltage ◽  
Specific Area ◽  
Input Voltage ◽  
Marx Generator ◽  
Power Devices ◽  
Laboratory Setup ◽  
High Voltage Gain ◽  
Main Components ◽  
Two Stages ◽  
Very High

The paper describes major issues related to the design of a portable SiC-based DC supply developed for evaluation of a high-voltage Marx generator. This generator is developed to be a part of an electromagnetic cannon providing very high voltage and current pulses aiming at the destruction of electronics equipment in a specific area. The portable DC supply offers a very high voltage gain: input voltage is 24 V, while the generator requires supply voltages up to 50 kV. Thus, the system contains two stages designed on the basis of SiC power devices operating with frequencies up to 100 kHz. At first, the input voltage is boosted up to 400 V by a non-isolated double-boost converter, and then a resonant DC-DC converter with a special transformer elevates the voltage to the required level. In the paper, the main components of the laboratory setup are presented, and experimental results of the DC supply and whole system are also shown.

scholarly journals Coal Flowability Control on Preventing Spillage on Conveyor Belt Through Modeling and Simulation for Improving its Performance

2021 ◽  
Vol 90 (1) ◽  
pp. 130-145
Author(s):  
Sabri Bahrun ◽  
Mohd Shahrizan Yusoff ◽  
Mohamad Sazali Said ◽  
Azmi Hassan
Keyword(s):  
Bulk Material ◽  
Extraction Process ◽  
Conveyor Belt ◽  
Underground Mines ◽  
Mining Site ◽  
Dem Simulation ◽  
Conveyor System ◽  
Average Production ◽  
And Performance ◽  
Belt Conveyors

Belt conveyors are generally used in mining plant areas, both surface and underground mines. The belt conveyor is mainly applied to transport the extracted bulk material from the mining site to delivery. The effectiveness of the extraction process depends on the reliability and durability of the conveyor belt system. In addition, conveyor performance is very important specially to control material flowability to prevent spills or other operational disturbances to optimize production throughput. However, the transfer chute and settling zone can cause some problems during the transfer process, such as material spills. This problem can reduce the function and performance of the conveyor belt. This paper discusses a design model to reduce the problem of spillage in the settling zone. The model was developed by compiling the previous defecting data from the durability of the conveyor system, then analyzed using Discrete Element Method (DEM) software and compared with bulk characteristics. The initial performance of certain conveyors is only capable of serving with an average production of 76% of the designed capacity while energy is consumed at full load. By applying the DEM simulation result, the blade gate can reduce the peak angle break in the depositional zone before exiting. After the analysis is completed using DEM, the conveyor increases the average production to 95% of the designed capacity. In conclusion, controlling the maximum belt load without spillage will reduce interruption on conveyor belt operation and maintenance costs therefore increase plant reliability and availability.

scholarly journals A Computer Vision-Based Real-Time Load Perception Method for Belt Conveyors

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Mengchao Zhang ◽  
Manshan Zhou ◽  
Hao Shi
Keyword(s):  
Computer Vision ◽  
Real Time ◽  
Conveyor Belt ◽  
Conveyor System ◽  
Load Detection ◽  
Speed Regulation ◽  
Computer Vision Technology ◽  
Belt Conveyors ◽  
Energy Saving Control ◽  
Load Perception

Real-time load detection method for belt conveyors based on computer vision is the research topic of this paper. A belt conveyor system equipped with cameras and a laser generator is used as the test apparatus. As the basis for conveyor intelligent speed regulation, two methods from different angles to perceive the load of conveyor belt were proposed, applied, and compared in this paper. Method 1 is based on the area proportion and method 2 is the detection based on laser-based computer vision technology. Laboratory experiments show that both methods can well detect the load on the conveyor belt. Method 2 is more economical and practical under the background of existing technology, also compared to the method 1, which provides a new idea and theoretical basis for the energy-saving control and intelligent development of the conveyor.

Application of Anytime Control to an Inherently Unstable Physical System

2015 ◽  
Author(s):  
Wayne Maxwell ◽  
Al Ferri ◽  
Bonnie Ferri
Keyword(s):  
Closed Loop ◽  
Initial Conditions ◽  
Transient Behavior ◽  
Open Loop ◽  
Loop System ◽  
Closed Loop System ◽  
Pendulum System ◽  
Inverted Pendulum System ◽  
Lqr Controller ◽  
Two Stages

This paper extends the use of closed-loop anytime control to systems that are inherently unstable in the open-loop. Previous work has shown that anytime control is very effective in compensating for occasional missed deadlines in the computer processor. When misses occur, the control law is truncated or partially executed. However, the previous work assumed that the open-loop system was stable. In this paper, the anytime strategy is applied to an inverted pendulum system. An LQR controller with estimated state feedback is designed and decomposed into two stages. Both stages are implemented most of the time, but in a small percentage of time, only the first stage is applied, with the resulting closed-loop system being unstable for short periods of time. The statistical performance of the closed-loop system is studied using Monte-Carlo simulations. It is seen that, on average, the closed-loop performance is very close to that of the full-order controller as long as the miss rate is relatively small. However, the variance of the response shows much higher dependence on the miss rate, suggesting that the response becomes more unpredictable. At a critical value of miss rate, the closed-loop system is unstable. The critical miss rate found through simulation is seen to correlate well with the results of a deterministic stability analysis. The statistics on the settling time are also studied, and shown to grow longer as the miss rate increases. The transient behavior of the system is studied for a range of initial conditions.

scholarly journals An Airport Knowledge-Based Method for Accurate Change Analysis of Airport Runways in VHR Remote Sensing Images

2020 ◽  
Vol 12 (19) ◽  
pp. 3163 ◽  
Author(s):  
Wei Ding ◽  
Jidong Wu
Keyword(s):  
Parallel Line ◽  
Extraction Methods ◽  
Analysis Method ◽  
Change Analysis ◽  
Multiple Features ◽  
Knowledge Based ◽  
Two Stages ◽  
Airport Runway ◽  
The Military ◽  
Very High

Due to the complexity of airport background and runway structure, the performances of most runway extraction methods are limited. Furthermore, at present, the military fields attach greater importance to semantic changes of some objects in the airport, but few studies have been done on this subject. To address these issues, this paper proposes an accurate runway change analysis method, which comprises two stages: airport runway extraction and runway change analysis. For the former stage, some airport knowledge, such as chevron markings and runway edge markings, are first applied in combination with multiple features of runways to improve the accuracy. In addition, the proposed method can accomplish airport runway extraction automatically. For the latter, semantic information and vector results of runway changes can be obtained simultaneously by comparing bi-temporal runway extraction results. In six test images with about 0.5-m spatial resolution, the average completeness of runway extraction is nearly 100%, and the average quality is nearly 89%. In addition, the final experiment using two sets of bi-temporal very high-resolution (VHR) images of runway changes demonstrated that semantic results obtained by our method are consistent with the real situation and the final accuracy is over 80%. Overall, the airport knowledge, especially chevron markings for runways and runway edge markings, are critical to runway recognition/detection, and multiple features of runways, such as shape and parallel line features, can further improve the completeness and accuracy of runway extraction. Finally, a small step has been taken in the study of runway semantic changes, which cannot be accomplished by change detection alone.

Far-Infrared Drying Effects onto the Physical Characteristics of Aquilaria malaccensis Leaves

2019 ◽  
Vol 797 ◽  
pp. 196-201
Author(s):  
Habsah Alwi ◽  
Nurul Shazana Mohd Zain ◽  
Hanafiah Zainal Abidin ◽  
Jefri Jaafar ◽  
Ku Halim Ku Hamid
Keyword(s):  
Moisture Content ◽  
Manufacturing Industry ◽  
Food Product ◽  
Far Infrared ◽  
Color Difference ◽  
Drying Process ◽  
Infrared Drying ◽  
Aquilaria Malaccensis ◽  
Before And After ◽  
Very High

Drying also known as dehydration is commonly used as a unit operation in herbs manufacturing industry to preserve the food product by removing the moisture content in the herbs. Unfortunately, most drying process degraded the product quality because the feedstock is exposed to a very high temperature within a long period of time by using conventional oven Therefore this research has focused on the alternatives technique in overcoming the degradation of nutrients by applying the irradiation concepts. The objectives of this research were to investigate the effect of drying onto the physical properties of Aquilaria Malaccensis leaves by using fabricated far-infrared dryer. The experiments were conducted at various temperature ranging from 40, 50 and 60°C. The color difference and the moisture content of the leaves before and after drying were examined. The color measurements data shows that at 60°C, the brightness and the chroma were the highest. On the other hand, the hue angles were the highest for 60°C when the time was reached 100 minutes.

SUPER SEPARATOR SPECTROMETER FOR THE LINAG HEAVY ION BEAMS

2009 ◽  
Vol 18 (10) ◽  
pp. 2160-2168 ◽  
Author(s):  
A. DROUART ◽  
J. A. NOLEN ◽  
H. SAVAJOLS
Keyword(s):  
Electron Spectroscopy ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Beams ◽  
Low Energy ◽  
Current Status ◽  
Secondary Reactions ◽  
Two Stages ◽  
Rotating Target ◽  
Very High

The Super Separator Spectrometer (S3) will receive the very high intensity heavy ion beams from the LINAG accelerator of SPIRAL2. Its privileged fields of physics are the delayed study of rare nuclei and secondary reactions with exotic nuclei. The project is presently in a phase of conceptual design. It includes a rotating target to sustain the high energy deposit, a two stages separator (momentum achromat) and spectrometer (mass spectrometer). Various detection set-ups are foreseen, especially a delayed α, γ, and electron spectroscopy array and a gas catcher coupled to a low energy branch. We present here the current status of the project and its main features.

Parametric Finite Element Analysis on Key Parts of the Conveyor

2011 ◽  
Vol 101-102 ◽  
pp. 755-758 ◽  
Author(s):  
Chun Sheng Yang
Keyword(s):  
Mechanical Characteristics ◽  
Bulk Material ◽  
Viscoelastic Model ◽  
Conveyor Belt ◽  
Belt Conveyor ◽  
Element Analysis ◽  
Conveyor System ◽  
Belt Conveyors ◽  
Parametric Finite Element Analysis ◽  
Research Situation

Belt conveyors are the major equipments for bulk material transportation.This paper analyses the static and dynamic behaviours of the belt, and establishes the dynamic elastic modulus. By analyzing the characteristics of the Kelvin and Maxwell viscoelastic model, the former is selected as the conveyor belt model as it can more realistically reflect the mechanical characteristics of the conveyor system. This paper introduces the development of the belt conveyor, and analyzes the current research situation at home and abroad.

Simulation and Experimental Verification of Silicon Microgyroscope's Closed-Loop Driving Circuits Based on Cadence

2015 ◽  
Vol 645-646 ◽  
pp. 543-547
Author(s):  
Wei Feng Tang ◽  
Guo Ming Xia ◽  
An Ping Qiu ◽  
Yan Su
Keyword(s):  
Experimental Verification ◽  
Closed Loop ◽  
Experimental Results ◽  
Resonant Circuit ◽  
Driving Frequency ◽  
Q Value ◽  
Output Current ◽  
Series Resonant ◽  
Stability Time ◽  
Very High

The output-current of silicon microgyroscope is at the level of 10-7A, so the requirements for circuits’ SNR are very high. This paper conducts the simulation of closed-loop driving circuits in Cadence on the basis of a RLC series resonant circuit. It turns out that experimental results fit the simulation which has a great significance for improving the property of circuits. First of all, the operating principle of silicon microgyroscope is introduced. Secondly, a RLC series resonant circuit is established by measuring Q value and driving frequency. Then the overall simulation is conducted in Cadence combined with chips’ models offered by the manufacturers. Finally, the accuracy of simulation is verified by experiments. Experimental results show that, the relative error of driving sense signal’s value is 0.5%, for stability time the value is 0.6% and for driving frequency the value is 38ppm. Experimental results agree well with the simulation, which confirms simulation’s accuracy. This has a great significance for improving the property of circuits.

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