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Online since: December 2013
Authors: Fábio Roberto Chavarette, Adriano dos Santos e Souza, Fernando Parra dos Anjos Lima, Simone Silva Frutuoso de Souza, Mara Lúcia Martins Lopes
Artificial Immune Systems with Negative Selection Applied to Health Monitoring of Aeronautical Structures
Fernando Parra dos Anjos Lima1, a, Fábio Roberto Chavarette3,b,
Adriano dos Santos e Souza1,c, Simone Silva Frutuoso de Souza2,d,
Mara Lúcia Martins Lopes3,e
1 Mechanical Engineering Department, Faculty of Engineering of Ilha Solteira (FEIS)
2 Electrical Engineering Department, Faculty of Engineering of Ilha Solteira (FEIS)
3Mathematics Department, Faculty of Engineering of Ilha Solteira (FEIS)
UNESP – Univ.Estadual Paulista, Av.
Structural flaws in aircraft may occur as a result of various factors, such as component wear, cracks, loosening of bolted connections, or simply the combination of these elements.
The spatial variation of the parameters affects the main dynamic parameters, such as response functions, resonance frequencies, damping ratio and eigenmodes of the structure [14].
The material properties used are the modulus of elasticity (E = 700 GPa) and the density (γ = 2710 kg/m3).
Structural flaws in aircraft may occur as a result of various factors, such as component wear, cracks, loosening of bolted connections, or simply the combination of these elements.
The spatial variation of the parameters affects the main dynamic parameters, such as response functions, resonance frequencies, damping ratio and eigenmodes of the structure [14].
The material properties used are the modulus of elasticity (E = 700 GPa) and the density (γ = 2710 kg/m3).
Online since: August 2013
Authors: Yi Bai Chen, Hong Bo Gao, Xiong Cao, Cai Tong Ke
Concrete shrinkage is the reduction in volume, caused by the factors such as the water change in the concrete, chemical reaction and temperature change.
In this project, t is 30 days; Portland cement is used, sois 1.0; The fineness of cement is 5000, sois 1.35; Aggregate is granite, sois 1.0; Water cement ratio is 0.52, sois 1.24; Cement content is 35%, sois 1.75; Natural curing is 4 days, sois 1.07; It is constructed in summer, when the climate is dry and environment relative humidity is 25%, sois 1.25; Hydraulic radius of frame beam is, sois 0.987,at the time, hydraulic radius of slab is, sois 1.0; Mechanical vibration is used, sois 1.0; Reinforcement ratio of frame beam is 0.06, sois 0.84, and reinforcement ratio of slab is 0.02, so is 0.944.
Treatment scheme The slab crack is not a stressed crack, and does not affect the safety of structure, but it influences the durability of concrete.
Properties of concrete(4e).
In this project, t is 30 days; Portland cement is used, sois 1.0; The fineness of cement is 5000, sois 1.35; Aggregate is granite, sois 1.0; Water cement ratio is 0.52, sois 1.24; Cement content is 35%, sois 1.75; Natural curing is 4 days, sois 1.07; It is constructed in summer, when the climate is dry and environment relative humidity is 25%, sois 1.25; Hydraulic radius of frame beam is, sois 0.987,at the time, hydraulic radius of slab is, sois 1.0; Mechanical vibration is used, sois 1.0; Reinforcement ratio of frame beam is 0.06, sois 0.84, and reinforcement ratio of slab is 0.02, so is 0.944.
Treatment scheme The slab crack is not a stressed crack, and does not affect the safety of structure, but it influences the durability of concrete.
Properties of concrete(4e).
Online since: September 2011
Authors: Wen Cai Luo, Zhong Quan Guo, Jian Xia Liu
It also affects other characteristics of launch vehicle, such as trajectory, flight stability, mechanical properties, etc.
CAD/CFD System Integration There are many problems in application of parametric modeling and simulation, because factors involved in it are complex.
CAD/CFD System Integration There are many problems in application of parametric modeling and simulation, because factors involved in it are complex.
Online since: November 2015
Authors: Witold Janik, Cezary Grabowik, Krzysztof Kalinowski, Grzegorz Ćwikła
The Graph of Operations Planning Sequence of a Production Order
for Scheduling with Mixed Planning Strategies and Alternatives
KALINOWSKI Krzysztof a, GRABOWIK Cezary b,
ĆWIKŁA Grzegorz c and JANIK Witold d
Silesian University of Technology, Faculty of Mechanical Engineering,
Institute of Engineering Processes Automation and Integrated Manufacturing Systems, Konarskiego 18A, 44-100 Gliwice, Poland
akrzysztof.kalinowski@polsl.pl, bcezary.grabowik@polsl.pl, cgrzegorz.cwikla@polsl.pl, dwitold.janik@polsl.pl
Keywords: scheduling, graphs, planning strategies, alternative routes, complex processes.
Process The process is the basic characteristic of an order that describes an ordered set of activities related to the change of shape, dimensions, and form of occurrence or the physicochemical properties of a processed object or activities related to positioning of parts or assemblies in a final product.
Application of a particular scheme depends on many factors, among others, the type of transport means, the presence and capacity of intermediate buffers between the workstations etc.
The adopted scheme affects also the length of production cycle.
Process The process is the basic characteristic of an order that describes an ordered set of activities related to the change of shape, dimensions, and form of occurrence or the physicochemical properties of a processed object or activities related to positioning of parts or assemblies in a final product.
Application of a particular scheme depends on many factors, among others, the type of transport means, the presence and capacity of intermediate buffers between the workstations etc.
The adopted scheme affects also the length of production cycle.
Online since: July 2008
Authors: Wei Wei Ming, Ming Chen, Qing Long An
Chen
c
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai China, 200240
a
mingseas@sjtu.edu.cn, b
qlan@sjtu.edu.cn, c
mchen@sjtu.edu.cn
Keywords: White layer, Grinding parameters, SKD-11 hardened steel
Abstract.
However, grinding has been considered more sensitive to form white layer in the ground surface than metal cutting with defined cutting edge because of the relative high heat flow into the workpiece surface induced by the poor heat transfer properties of the grinding wheels such as aluminum oxide wheels and the intensive ploughing effect produced by the negative rake angle of the grinding wheels [7].
Temperature is one of the major factors of white layer formation mechanism.
Fig. 10 Micro-hardness in hot-affective region Fig. 11 Micro-hardness in hot-affective region against grinding depth against feed rate According to the analysis, grinding depth directly affect the white layer formation and the thickness of white layer as well as the hot-affective region.
However, grinding has been considered more sensitive to form white layer in the ground surface than metal cutting with defined cutting edge because of the relative high heat flow into the workpiece surface induced by the poor heat transfer properties of the grinding wheels such as aluminum oxide wheels and the intensive ploughing effect produced by the negative rake angle of the grinding wheels [7].
Temperature is one of the major factors of white layer formation mechanism.
Fig. 10 Micro-hardness in hot-affective region Fig. 11 Micro-hardness in hot-affective region against grinding depth against feed rate According to the analysis, grinding depth directly affect the white layer formation and the thickness of white layer as well as the hot-affective region.
Online since: May 2020
Authors: Miroslav Císar, Ivan Zajačko, Aleksandr Ivanovich Korshunov, T.N. Ivanova
Indicators of wearing identified in the research are including the type and properties of interacting surfaces characterized by the roughness of cutting bit surface, the hardness of materials in contact zone, friction mode that depends on unit pressure, movement rate, the nature of load application, and the rate of interaction of working parts of bit.
The presence of these pressures exerts considerable influence on rock resistance to rupture by rock destruction tool - bit or drilling head and affects drilling technology.
This sufficiently increases the flexural strength of an alloy with toughness growth being equal to 20-30% and shock durability being 10 times larger. [1,5,6] Taking into account the main physical-mechanical properties, medium and coarse-grained alloys with low cobalt content are employed for reinforcement of tools working under conditions of shockless loads, i.e. drilling tools for rotation drilling.
If wear intensity ω is introduced as wear W per unit of work of friction forces AT, , (3) where f – friction coefficient, Р – normal loading, L – friction path. then wear per time unit t0 will be called wear rate а; It was established that wear indices depend on great amount of simultaneously acting factors: type and properties of interacting surfaces (roughness, crookedness, hardness of materials), friction mode (unit pressure, movement rate, the nature of load application and the rate of interaction of working members of bit), type and properties of environment (lubricating and cooling ability). [3, 4] The metal cutting is characteristic by small energy losses due to the friction between the tool and machined material.
Zavialov, Influence of process fluids properties on component surface convective heat emission MEACS 2017 IOP Publishing IOP Conf.
The presence of these pressures exerts considerable influence on rock resistance to rupture by rock destruction tool - bit or drilling head and affects drilling technology.
This sufficiently increases the flexural strength of an alloy with toughness growth being equal to 20-30% and shock durability being 10 times larger. [1,5,6] Taking into account the main physical-mechanical properties, medium and coarse-grained alloys with low cobalt content are employed for reinforcement of tools working under conditions of shockless loads, i.e. drilling tools for rotation drilling.
If wear intensity ω is introduced as wear W per unit of work of friction forces AT, , (3) where f – friction coefficient, Р – normal loading, L – friction path. then wear per time unit t0 will be called wear rate а; It was established that wear indices depend on great amount of simultaneously acting factors: type and properties of interacting surfaces (roughness, crookedness, hardness of materials), friction mode (unit pressure, movement rate, the nature of load application and the rate of interaction of working members of bit), type and properties of environment (lubricating and cooling ability). [3, 4] The metal cutting is characteristic by small energy losses due to the friction between the tool and machined material.
Zavialov, Influence of process fluids properties on component surface convective heat emission MEACS 2017 IOP Publishing IOP Conf.
Online since: March 2016
Authors: Gang Liu, Xin Xing Zhou, Shao Peng Wu
The interface of bitumen mixture is the key factor for each distress.
Zhang, Rheological properties of amorphous poly alpha olefin (APAO) modified asphalt binders.
Yi, Effect of Surface Active Agents on the Rheological Properties and Solubility of LDHs Modified Asphalt.
Greenfield, Analyzing properties of model asphalts using molecular simulation.
Holste, Use of surface free energy properties of the asphaltaggregate system to predict moisture damage potential.
Zhang, Rheological properties of amorphous poly alpha olefin (APAO) modified asphalt binders.
Yi, Effect of Surface Active Agents on the Rheological Properties and Solubility of LDHs Modified Asphalt.
Greenfield, Analyzing properties of model asphalts using molecular simulation.
Holste, Use of surface free energy properties of the asphaltaggregate system to predict moisture damage potential.
Online since: February 2014
Authors: Jun Tan, Hai Ming Zhao
Construction of Data Warehouse Platform in Continual Quality Improvement
Jun TAN1,2,a , Haiming ZHAO2
1College of Computer and Information Engineering, Central South University of Forestry and Technology, Changsha, Hunan, China
2College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan, China
atanjun007@vip.sina.com
Keywords: data warehouse; continual quality improvement; association rules mining system; snowflake schema; three-tier structure
Abstract.
Introduction The product quality which satisfy and exceed even expect of customer is the key factor for enterprise to success in competitive market.
Before linked to OLAP server, it is necessary to explicit definition of schema for adapting situation of enterprises, because inappropriate schema will affect performance of system.
Artificial neural networks for modeling the mechanical properties of steels in various applications [J].
Introduction The product quality which satisfy and exceed even expect of customer is the key factor for enterprise to success in competitive market.
Before linked to OLAP server, it is necessary to explicit definition of schema for adapting situation of enterprises, because inappropriate schema will affect performance of system.
Artificial neural networks for modeling the mechanical properties of steels in various applications [J].
Online since: August 2014
Authors: F. Javier Baeza, S. Ivorra, David Bru, F. Borja Varona
The importance of the current work is assessing the actual conditions of the structure (a heavily damaged masonry chimney), and how this state affects the numerical modelling.
Table 1 includes the mechanical parameters for both brick and mortar, and the curve included in Fig 4(d) has been obtained considering the suggestions made by Bilgin et al. [3].
Mechanical properties of the materials considered in the numerical model Brick Mortar Type fb (MPa) Eb (MPa) Type Dossage fj (MPa) Ej (MPa) M 17.7 5300 Weak 1:0:6 3.1 545 The following analyses have been run in the numerical model: Self weight static non lineal, Modal, Pushover, static wind non lineal, spectral in different directions, Time history analysis for accelerograms.
Even though it was not considered a 1.3 amplification factor, which would be mandatory once the structure was cataloged as historical heritage.
Table 1 includes the mechanical parameters for both brick and mortar, and the curve included in Fig 4(d) has been obtained considering the suggestions made by Bilgin et al. [3].
Mechanical properties of the materials considered in the numerical model Brick Mortar Type fb (MPa) Eb (MPa) Type Dossage fj (MPa) Ej (MPa) M 17.7 5300 Weak 1:0:6 3.1 545 The following analyses have been run in the numerical model: Self weight static non lineal, Modal, Pushover, static wind non lineal, spectral in different directions, Time history analysis for accelerograms.
Even though it was not considered a 1.3 amplification factor, which would be mandatory once the structure was cataloged as historical heritage.
Online since: January 2012
Authors: Wen Fu Wu, Chun Cheng Zuo, Feng Han, Hang Zhu, Chun Shan Liu
College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China
2.
College of Mechanical Engineering, Jiamusi University, Jiamusi, 154007, China ahan5578@163.com,blshxhf@126.com, cwwfzlb@126.com Key words:Grain drying; Model; Dryer; Virtual instrument Abstract:Drying plays an important role in the post-harvesting process of grain, and the quality of the corn after drying has received an increasing concern.
Because of the drying process of multi-factor, multi-level, variable structure, time-varying and nonlinear characteristics such as intelligence, robustness and good drying process control system has become the key [1, 2], the stability control system will affect the efficiency of operations dryer, dry mass, energy consumption and even security [3].
Use of control system software can be projected to achieve automatic control of drying process of grain drying mathematical model, numerical method for the actual drying of heat and mass transfer process simulations can predict the result of the drying process dryer and dryer properties.
College of Mechanical Engineering, Jiamusi University, Jiamusi, 154007, China ahan5578@163.com,blshxhf@126.com, cwwfzlb@126.com Key words:Grain drying; Model; Dryer; Virtual instrument Abstract:Drying plays an important role in the post-harvesting process of grain, and the quality of the corn after drying has received an increasing concern.
Because of the drying process of multi-factor, multi-level, variable structure, time-varying and nonlinear characteristics such as intelligence, robustness and good drying process control system has become the key [1, 2], the stability control system will affect the efficiency of operations dryer, dry mass, energy consumption and even security [3].
Use of control system software can be projected to achieve automatic control of drying process of grain drying mathematical model, numerical method for the actual drying of heat and mass transfer process simulations can predict the result of the drying process dryer and dryer properties.