scholarly journals THEORETICAL CONSIDERATIONS ON THE OPTIMIZATION OF THE WORKING PROCESS OF VARIABLE WIDTH PLOUGHS

2021 ◽  
pp. 129-140
Author(s):  
Cristian Nuƫescu ◽  
Iuliana Gageanu ◽  
Dan Cujbescu
Keyword(s):  
Experimental Validation ◽  
Traction Force ◽  
Theoretical Research ◽  
Control Parameters ◽  
Working Process ◽  
Regression Functions ◽  
Multivariable Regression ◽  
Experimental Plan ◽  
Theoretical Considerations ◽  
Theoretical Results

The paper presents theoretical research conducted for the optimization of the working process of variable width ploughs. Thus, were determined multivariable regression functions for the traction force of the plough with variable working function of the control parameters: working depth, working width and working speed. The use of these theoretical considerations of the optimal points sought lead to the opportunity of making assessments on the possibilities to conduct their experimental validation. Conditions for an experimental plan were formulated to highlight such optimal points and the theoretical results were validated through experiments.

EXPERIMENTAL VALIDATION OF THE CHARLESBY AND HORIKX MODELS APPLIED TO DE-VULCANIZATION OF SULFUR AND PEROXIDE VULCANIZATES OF NR AND EPDM

2016 ◽  
Vol 89 (4) ◽  
pp. 671-688 ◽  
Author(s):  
M. A. L. Verbruggen ◽  
L. van der Does ◽  
W. K. Dierkes ◽  
J. W. M. Noordermeer
Keyword(s):  
Experimental Validation ◽  
Main Chain ◽  
Sol Gel ◽  
Chain Scission ◽  
Cross Linking ◽  
Cross Link ◽  
Practical Reality ◽  
Cross Links ◽  
The Cross ◽  
Theoretical Considerations

ABSTRACT The theoretical model developed by Charlesby to quantify the balance between cross-links creation of polymers and chain scission during radiation cross-linking and further modifications by Horikx to describe network breakdown from aging were merged to characterize the balance of both types of scission on the development of the sol content during de-vulcanization of rubber networks. There are, however, disturbing factors in these theoretical considerations vis-à-vis practical reality. Sulfur- and peroxide-cured NR and EPDM vulcanizates were de-vulcanized under conditions of selective cross-link and random main-chain scissions. Cross-link scission was obtained using thiol-amine reagents for selective cleavage of sulfur cross-links. Random main-chain scission was achieved by heating peroxide vulcanizates of NR with diphenyldisulfide, a method commonly employed for NR reclaiming. An important factor in the analyses of these experiments is the cross-linking index. Its value must be calculated using the sol fraction of the cross-linked network before de-vulcanization to obtain reliable results. The values for the cross-linking index calculated with sol-gel data before de-vulcanization appear to fit the experimentally determined modes of network scission during de-vulcanization very well. This study confirms that the treatment of de-vulcanization data with the merged Charlesby and Horikx models can be used satisfactorily to characterize the de-vulcanization of NR and EPDM vulcanizates.

III.—On the Original Form of Sedimentary Deposits

1903 ◽  
Vol 10 (1) ◽  
pp. 12-18 ◽  
Author(s):  
J. F. Blake
Keyword(s):  
Essential Elements ◽  
Original Form ◽  
Sedimentary Deposits ◽  
Sea Bottom ◽  
Theoretical Considerations ◽  
Theoretical Results

The form of the deposits that are taking place on the sea-bottom at the present day is one of the essential elements required to be known when we wish to interpret the submarine contours, as throwing light on the submergence or elevation of the land in late geological times, or when we propose to use the variation of thickness of the strata deposited during any epoch as an indication of the position of the shore-lines at that time.In the case of deposits in small or temporary masses of water, their form and arrangement may sometimes be observed directly; but in the case of the deposits in the sea, where we can neither remove the water nor make borings beneath it, we can only avail ourselves of theoretical considerations.It might have been expected that the original form of various sedimentary deposits would have been considered in detail long ago, but as a matter of fact the few writers who have touched upon the question have mostly been content with the assumption that deposits taken as a whole are thickest near the source of supply, and the figures given in illustration of the arrangement of various kinds, and thereby the shape of each, are remarkable for their variety.As the theoretical results at which I have arrived differ fundamentally from the ordinary assumptions, it is to be hoped that some one will be able to point out the fallacy, if any, which has led me astray, and to explain more satisfactorily the observed features which appear to confirm the theory.

scholarly journals Research Results of the Potato Digger Technological Process

2018 ◽  
Vol 12 (5) ◽  
pp. 14-19 ◽  
Author(s):  
V. M. Alakin ◽  
G. S. Nikitin
Keyword(s):  
Design Parameters ◽  
Operating Speed ◽  
Working Process ◽  
Projectile Motion ◽  
Operating Process ◽  
Cutoff Angle ◽  
The Stability ◽  
Theoretical Results ◽  
Optimum Working

A potato digger equipped with a four­bladed beater operating in connection with rotary separating surface has low material and energy consumption, higher separating efficiency, as well as lower degree of tuber damaging. The potato digger design should include a four­bladed intake­and­feed beater to prevent potato heap transportation faults in front of the first section. (Research purpose) Increasing the technological and economic efficiency of a potato digging­and­ separating unit through the determination of the optimum values of the design parameters and operating process of the intake­and­feed beater. (Materials and methods) the authors have made an overview of general principles of ensuring the stability of the potato heap movement provided by the four­bladed intake­and­feed beater. The dependency of the minimum beater speed on the operating speed of the potato digger has been found to exclude a probability of its overloading. The methodology of calculating the potato heap velocity and the cutoff angle between the material and the beater blades has been worked out by analyzing potato heap lifting to the upper points of the working units of the rotary separator’s first section. Operating speed of the beater has been determined through the differential equation for the speed of a potato heap moving along the blade surface. (Results and discussion) Preliminary potato heap speed and cutoff angle have been found through the equation of dynamics describing the projectile motion of an object thrown at an angle. The operating values of the angles are dependent on the potato digger working speed and can be selected from the triangle of speeds. The authors have determined the dependence of the optimal beater speed on the working speed of a potato digger. Its value should exceed the minimum speed of the beater. (Conclusions) Theoretical results allow proposing the best design features and optimum working process parameters of a four­bladed beater receiving a potato heap, transporting it and lifting on the rotary separating surface.

Experiment and Simulation for Grid-Connected Photovoltaic Micro-Invereter

2013 ◽  
Vol 448-453 ◽  
pp. 1480-1485
Author(s):  
Li Jie Yin ◽  
Ya Zhen ◽  
Qi Li Fan
Keyword(s):  
Simulation Model ◽  
Control Algorithm ◽  
Single Phase ◽  
High Accuracy ◽  
Control Parameters ◽  
Working Process ◽  
Topology Structure ◽  
Matlab Software ◽  
Fast Speed ◽  
Micro Inverter

A modeling method of single-phase grid-connected photovoltaic micro-inverter is presented in this paper,which depends on the topology structure of fly-back converter. Simulation of the micro-inverter is performed using Matlab software, which has the virtues of high accuracy and fast speed. Prototype experiment results show that the simulation model can be a true reflection of the working process of a micro-inverter, and could be used to verify the control algorithm and select the control parameters.

scholarly journals The Study of the Theoretical Size and Node Probability of the Loop Cutset in Bayesian Networks

Mathematics ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 1079 ◽  
Author(s):  
Jie Wei ◽  
Yufeng Nie ◽  
Wenxian Xie
Keyword(s):  
Probability Theory ◽  
Graph Theory ◽  
Bayesian Inference ◽  
Bayesian Networks ◽  
Numerical Simulations ◽  
Complete Graph ◽  
Upper Bound ◽  
Numerical Algorithms ◽  
Theoretical Research ◽  
Theoretical Results

Pearl’s conditioning method is one of the basic algorithms of Bayesian inference, and the loop cutset is crucial for the implementation of conditioning. There are many numerical algorithms for solving the loop cutset, but theoretical research on the characteristics of the loop cutset is lacking. In this paper, theoretical insights into the size and node probability of the loop cutset are obtained based on graph theory and probability theory. It is proven that when the loop cutset in a p-complete graph has a size of p − 2 , the upper bound of the size can be determined by the number of nodes. Furthermore, the probability that a node belongs to the loop cutset is proven to be positively correlated with its degree. Numerical simulations show that the application of the theoretical results can facilitate the prediction and verification of the loop cutset problem. This work is helpful in evaluating the performance of Bayesian networks.

Kernel Design and Distributed, Self-Triggered Control for Coordination of Autonomous Multi-Agent Configurations

Robotica ◽  
2018 ◽  
Vol 36 (7) ◽  
pp. 1077-1097 ◽  
Author(s):  
Levi DeVries ◽  
Aaron Sims ◽  
Michael D. M. Kutzer
Keyword(s):  
Experimental Validation ◽  
Graph Transformation ◽  
Multi Agent Systems ◽  
Graph Topology ◽  
Agent Communication ◽  
Agent Systems ◽  
Cloud Server ◽  
Multi Agent ◽  
Kernel Design ◽  
Theoretical Results

SUMMARYAutonomous multi-agent systems show promise in countless applications, but can be hindered in environments where inter-agent communication is limited. In such cases, this paper considers a scenario where agents communicate intermittently through a cloud server. We derive a graph transformation mapping the kernel of a graph's Laplacian to a desired configuration vector while retaining graph topology characteristics. The transformation facilitates derivation of a self-triggered controller driving agents to prescribed configurations while regulating instances of inter-agent communication. Experimental validation of the theoretical results shows the self-triggered approach drives agents to a desired configuration using fewer control updates than traditional periodic implementations.

The Cleaning Performance Simulation of Rear Rolling Type Sweeper

2013 ◽  
Vol 385-386 ◽  
pp. 281-287
Author(s):  
Zhi Qiang Wang ◽  
Xue Liang Bian ◽  
You Ning Feng
Keyword(s):  
Theoretical Model ◽  
Simulation Analysis ◽  
Virtual Prototype ◽  
Ideal Theory ◽  
Contact Dynamics ◽  
Theoretical Research ◽  
Prototype Model ◽  
Prototype System ◽  
Working Process ◽  
Element Analysis

Through analyzed the cleaning process of rear rolling type sweeper, the theoretical model of waste particle trajectory was established during the sweeper working process by using the contact theory of modern contact dynamics, and the ideal theory track of waste particle was simulated and optimized by using MATLAB. The three-dimensional solid model of the working device was created by using UG software, and virtual prototype model was completed by using ADAMS software, and rigid brush was replaced by neutral file with brush features characterize that was generated by finite element analysis software, and contact relationship of waste particle during the working process was added by ADAMS contact order, and rigid-flexible coupling virtual prototype system was completed and kinematics simulation was run. Finally, compared the trajectory curve from ADAMS simulation with the theoretical path from MATLAB, the Theoretical model was proved correctness. The theoretical research and simulation analysis was made test and verify each other. Facilitate the development of the same type of products.

Research Regarding the Dynamic Behavior of Linear Hydraulic Servo-Systems

2013 ◽  
Vol 325-326 ◽  
pp. 480-485
Author(s):  
Petrin Drumea ◽  
Corneliu Cristescu ◽  
Catalin Dumitrescu ◽  
Iulian Dutu ◽  
Ioana Ilie
Keyword(s):  
Mathematical Modeling ◽  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Theoretical Research ◽  
Scientific Interest ◽  
Servo Systems ◽  
Hydraulic Motors ◽  
Hydraulic Servo ◽  
Computer Numerical Simulation ◽  
Theoretical Results

The paper presents the theoretical results of extensive research on the dynamic behavior of linear hydraulic motors, carried out in INOE 2000-IHP, in the framework of the NUCLEU Programmer. The research has been conducted both theoretically and experimentally, but, in this paper, is presented only the theoretical research. Theoretical research has taken place with the modern means of mathematical modeling and computer numerical simulation. The article presents some theoretical interested results obtained in the research, results that are of real scientific interest, but, also, with practical value through their use in the design of fluid power components and equipments.

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