scholarly journals Researches for the Modernization of Silage Fodder Distribution Technologies for Cattle

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Ancuta NEDELCU ◽  
Radu CIUPERCA ◽  
Dragos MANEA
Keyword(s):  
Mathematical Model ◽  
State Of The Art ◽  
Hydraulic Power ◽  
Hydraulic Equipment ◽  
Live Stock ◽  
Straw Bale

In order to modernize and turn account the foddering technologies for cattle in live stock farms, a state of the art machine has been achieved aiming to perform several operations within the fodder distributing technology: silage displacement, loading, mincing and mixing, hay and straw bale chopping, fodder automating weighing, mixing homogenizing and distributing the obtained fodder mixture. The paper presents the results of researches aimed to obtain a special hydraulically driven equipment of displacing and loading the ensilage fodder, its characteristics and mathematical model for calculating the required power PE , the hydraulic power PH , in view of properly choosing the hydraulic equipment.

scholarly journals Preliminary analysis on an IVHM approach for prognosis of high-pressure filters for hydraulic Power Control Modules of helicopters

2019 ◽  
Vol 304 ◽  
pp. 04017
Author(s):  
Andrea De Martin ◽  
Giovanni Jacazio ◽  
Massimo Sorli ◽  
Vincenzo Surdo
Keyword(s):  
State Of The Art ◽  
Operating Conditions ◽  
High Fidelity Simulation ◽  
Simulation Environment ◽  
Hydraulic Power ◽  
Hydraulic Equipment ◽  
Rigorous Description ◽  
Rotating Wing ◽  
Control Modules ◽  
Prognostics And Health Monitoring

The process of filtration is critical to ensure long operative life to on-board hydraulic equipment, especially in rotating-wing application where the severe vibratory environment lead to accelerated wear of the mechanical components and hence an increased production of debris. Filtration is obtained by mechanically separating the physical contaminants from the hydraulic fluid by means of filters, which hence tend to clog under prolonged usage. Filter replacement has been so far pursued through scheduled maintenance strategy, which however have proven to be rather cost-ineffective. To transition to a Condition-Based Maintenance, new Prognostics and Health Monitoring frameworks need to be developed. The paper deals with the feasibility analysis of such a system based on a high-fidelity simulation environment, rigorous description of the operating conditions and state-of-the-art algorithms.

Study of Light Weight Turbine Transmission Systems

1976 ◽  
Author(s):  
D. J. Fessett
Keyword(s):  
Gas Turbines ◽  
State Of The Art ◽  
Chain Drive ◽  
Tape Drive ◽  
Hydraulic Power ◽  
Transmission Systems ◽  
Determining Factors ◽  
Technical Risks ◽  
The Right ◽  
Marine Vessels

Several transmission systems that are applicable to advanced marine vessels were investigated to determine if drives other than right-angle gearboxes would be practical in transmitting 50,000 (37.3 NW) hp from dual gas turbines downward through a vertical distance of 20 (6.10 m) ft to a propeller drive shaft. These systems included: hydraulic power, chain drive, steel tape drive, and a slider crank drive. Results of this survey indicated the right-angle bevel gear drive was the optimum system considering our present state-of-the-art. Further investigation was performed to optimize turbine and gearbox arrangement using weight, reliability, efficiency, serviceability, technical risks, and relative cost as the determining factors.

Mathematical Simulation of Hydraulic Power Pulse Machine at Matlab

2016 ◽  
Vol 685 ◽  
pp. 240-243 ◽  
Author(s):  
M.V. Novoseltseva ◽  
E.N. Pashkov ◽  
I.A. Masson
Keyword(s):  
Mathematical Model ◽  
Mathematical Simulation ◽  
Model Simulation ◽  
General Idea ◽  
Restriction Factors ◽  
Hydraulic Power ◽  
Power Pulse ◽  
Machine Operation ◽  
Simulation Results

General idea of mathematical simulation is set. Equations that describe hydraulic power pulse machine operation are described. Restriction factors are identified; they are included in mathematical model simulation. Mathematical simulation results are shown for essential parts of machine. Results of hydraulic power pulse machine mathematical simulation are presented.

Modelling the behaviour of oil spills in natural waters

1993 ◽  
Vol 20 (2) ◽  
pp. 210-219 ◽  
Author(s):  
G. K. Luk ◽  
H. F. Kuan
Keyword(s):  
Mathematical Model ◽  
Natural Waters ◽  
Oil Spills ◽  
State Of The Art ◽  
Oil Composition ◽  
Weathering Processes ◽  
Transport And Mixing ◽  
Spilled Oil ◽  
Initial Results ◽  
Petroleum Oil

This paper is a state-of-the-art review of the formulations for the different processes responsible for the transport and mixing of petroleum oil spilled in natural waters. Processes accounting for the transfer and loss of the surface oil, such as initial spreading, evaporation, dissolution, emulsification, dispersion, photo-oxidation, and sedimentation, are included. Based on the findings, a dynamic mathematical model describing the fate of spilled oil was developed. To reflect field observations, the surface oil composition in the model is allowed to vary with time as a result of weathering. Initial results for model testing are presented. Key words: oil spill, mathematical model, fate model, weathering processes.

Face Gearing With a Conical Involute Pinion: Part 2 — The Face Gear: Meshing With the Pinion, Tooth Geometry and Generation

2003 ◽  
Author(s):  
Jie Tan
Keyword(s):  
Mathematical Model ◽  
State Of The Art ◽  
Gear Tooth ◽  
Face Gear ◽  
Design Considerations ◽  
Continuous Generation ◽  
The Face ◽  
Basic Plane ◽  
Definition Of ◽  
Intermediate Member

Definition of the face gearing with a conical involute pinion starts with the basic rack. The pinion and the face gear are obtained as the result of true conjugate generation, with generating action described by the equation of meshing. The limiting conditions of undercutting, interference and pointing on the face gear tooth are determined. A new method is proposed for continuous generation of the face gear with an intermediate member, which, together with state of the art CNC technologies, allows practical grinding, hobbing or shaving of the face gear. A mathematical model is established which relates the basic plane, the pinion, the intermediate member and the face gear with true conjugate action, thereby determining the relative position and motion between any two of the four members. Design considerations are discussed. A numerical example is given.

scholarly journals Design and Numerical Simulation-Based Optimization of a Novel Flat-Face Coupling System for Hydraulic Power Equipment

2021 ◽  
Vol 11 (1) ◽  
pp. 388
Author(s):  
Yu-Ting Wu ◽  
Zhen Qin ◽  
Amre Eizad ◽  
Sung-Ki Lyu
Keyword(s):  
Power Transmission ◽  
Fluid Pressure ◽  
Vital Role ◽  
The Novel ◽  
Hydraulic Power ◽  
Working Pressure ◽  
Operational Mechanism ◽  
Transmission Equipment ◽  
Coupling System ◽  
Hydraulic Equipment

Coupling systems play a vital role in hydraulic power transmission equipment. In recent years, flat-face coupling systems have been extensively studied due to their environment friendly features. The difficulty of the connection process of hydraulic equipment increases with the increase in their working pressure. To improve the convenience of making high-pressure connections, a novel flat-face coupling system is proposed in this article. In the proposed design, which is based on the conventional flat-face coupling system, the resistance caused by high hydraulic fluid pressure during coupling is drastically reduced by the addition of an instantaneous pressure relief module. In this study, the theoretical model of the system kinetics is established to illustrate the operational mechanism of the novel design, and a series of computational fluid dynamics numerical investigations based on the novel dynamic mesh technology and Ansys Mosaic meshing technology are implemented to verify the rationality of the proposed design. Additionally, an optimal design of the novel flat-face coupling system is proposed to reduce the energy loss during hydraulic power transmission.

scholarly journals Towards the design of a social-inspired module for the decision making of nodes in an ad hoc network

2016 ◽  
Vol 14 (36) ◽  
pp. 9-25
Author(s):  
John Edwar González ◽  
Jorge Eduardo Ortiz ◽  
Henry Zárate Ceballos
Keyword(s):  
Mathematical Model ◽  
Decision Making ◽  
Distributed System ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
State Of The Art ◽  
Computational System ◽  
Software Module ◽  
Internal Parameters ◽  
Hoc Networks

This article presents the state of the art derived from a research project where the construction of a software module related with the capability of the wireless nodes to decide whether or not to enter an ad hoc network, is proposed. If the decision is to enter, the amount of resources needed to provide the net is assessed by analyzing data provided for the network about the resources available and the number of nodes and internal parameters (CPU, hard disk, and processor, among others) through a mathematical model. The module developed should interact with an interpreter at a lower level and with a higher level entity, a distributed system. The research is supported by the computational system of the TLÖN group of the Universidad Nacional de Colombia, where its main purpose is to study the application of a social-inspired paradigm in ad hoc networks.

scholarly journals Some insights into an integrative mathematical model: a prototype-model for bodyweight and energy homeostasis

2016 ◽  
Vol 7 (3) ◽  
pp. 1271
Author(s):  
Jorge Guerra Pires
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Literature Review ◽  
Differential Equations ◽  
Mathematical Models ◽  
Quantitative Methods ◽  
Energy Homeostasis ◽  
State Of The Art ◽  
Prototype Model ◽  
Current State

The ambition of this document is to set in evidence the prerequisite for integrative (mathematical) models, mechanism-based models, for appetite/bodyweight control. For achieving this goal, it is provided a scrutinized literature review and it is organized them in such a way to make the point. The quantitative methods exploited by the authors are called differential equations solved numerically; they are discussed briefly since it is not our goal herein to handle details. On the current state of the art, there is no mathematical model to the best of the author’s knowledge targeting at integrating several hormones at once in mathematical descriptions: even for single hormones, the literature is either occasional or do not exist at all; it is depicted some results for simple models already built. As it can be seen, the functions and roles seem fuzzy, most hormones seem to be piloting the same undertaking. The key challenge from a mathematical modeling perspective is how to separate properly the mechanisms of each hormone. The kind of pursuit presented herein could initiate an imperative cascade of mathematical modeling applied to metabolism of bodyweight control and energy homeostasis.

scholarly journals Cortical-inspired image reconstruction via sub-Riemannian geometry and hypoelliptic diffusion

2018 ◽  
Vol 64 ◽  
pp. 37-53
Author(s):  
Ugo Boscain ◽  
Roman Chertovskih ◽  
Jean-Paul Gauthier ◽  
Dario Prandi ◽  
Alexey Remizov
Keyword(s):  
Mathematical Model ◽  
Visual Cortex ◽  
Image Reconstruction ◽  
Visual System ◽  
Primary Visual Cortex ◽  
Riemannian Geometry ◽  
State Of The Art ◽  
Image Inpainting ◽  
The State

In this paper we review several algorithms for image inpainting based on the hypoelliptic diffusion naturally associated with a mathematical model of the primary visual cortex. In particular, we present one algorithm that does not exploit the information of where the image is corrupted, and others that do it. While the first algorithm is able to reconstruct only images that our visual system is still capable of recognize, we show that those of the second type completely transcend such limitation providing reconstructions at the state-of-the-art in image inpainting. This can be interpreted as a validation of the fact that our visual cortex actually encodes the first type of algorithm.

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