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Mendes, Elisabete Scoli - One of the best experts on this subject based on the ideXlab platform.

  • Propriedades eletroreologicas de suspensões de sulfato de hidrazina-litio em oleo de silicone
    [s.n.], 2018
    Co-Authors: Mendes, Elisabete Scoli
    Abstract:

    Orientador: Cesar Costapinto SantanaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia QuimicaResumo: Fluidos eletroreológicos (ER) são substâncias que mudam suas propriedades óticas, elétricas, volumétricas, acústicas e mecânicas na presença de um campo elétrico esteno. Estes Fluidos são formados por partículas finas de materiais orgânicos ou inorgânicos em líquidos dielétricos e têm grande aplicação aeronáutica, medicina e com Fluidos de vedação. Sob a influência do campo elétrico, as partículas destes fluídos se alinham, formam uma estrutura de filamento na direção do campo, a qual resiste ao escoamento do Fluido ER. Neste trabalho sintetizou-se o sólido sulfato de hidrazina ¿ liito e analisou-se as características elétricas e reológicas da suspensão eletroreológica sulfato de hidrazina-litio em óleo de silicone. Os resultados experimentais foram obtidos para os diversos parâmetros: temperatura (20,40,60 graus Celsius), intensidade de campo elétrico (0 até 7 kilovolts por milímitro), diâmetro de partículas (menores que 37, 62,5 e 89,5 microns), a fração em peso de sólidos (20,30,35 por cento em peso), viscosidade cinimática do óleo de silicone (200, 350 e 1000 centiStokes). As propriedades reológicas das diferentes suspensões foram determinadas em vum reomatro rotatório Haake modelo RV20 com um sistema de medida CV20ER equipado com um fonte de alta tenção. As suspensões estudadas exibiram fortes variações de suas características reológicas de Fluido não newtoniano sob ação do campo elétrico, de acordo com fenômeno reportado na literatura ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digitalAbstract: Eletro-rheological Fluids (ER) are substances that have their optical, electrical volumetric, acoustic and mechanic properties altered when in presence of na external electrical field. These Fluids are compesed by fine particles of organic and inorganic material in di-electrical liquids and have a large application in the automotive industry, hydraulic industry, robots industry, aeronautic, medicine and as Seal Fluid. Under the influence of an electrical fied, the particles of these Fluids are lined up, generating a structure aligned in the field direction. This structure reduces the ER Fluid flowing capacity. In this work, lithium hydrazinium sulfate solid was synthesized. The electrical and rheological characteristics of the eletro-rheological suspension of the lithium hidrazinium sulfate in silicon oil were analysed. Experimental results were obtained for the following parameters: temperature (20,40,60 degrees Celsius), electrical field intensity (from 0 to 7 kilovolts per milimetre), particles diameters (smaller than 37, 62,5 e 89,5 micro), solid weight percent (20,30,35 percent in weight), silicone oil kinematic viscosity (200,350 and 1000 centistokes). The rheological properties of the different suspensions were determined in a rotatory rheometer Haake model RV 20 with a measurement system CV20ER, including a high power supply. The analysed suspension showed strong variations of their non-Newtonian rheological characteristics under the electrical field, according to what reported in the previous literature ...Note: The complete abstract is available with the full electronic digital thesis or dissertationsDoutoradoEngenharia de ProcessosDoutor em Engenharia Químic

Elisabete Scoli Mendes - One of the best experts on this subject based on the ideXlab platform.

  • Propriedades eletroreologicas de suspensões de sulfato de hidrazina-litio em oleo de silicone
    2017
    Co-Authors: Elisabete Scoli Mendes
    Abstract:

    Resumo: Fluidos eletroreológicos (ER) são substâncias que mudam suas propriedades óticas, elétricas, volumétricas, acústicas e mecânicas na presença de um campo elétrico esteno. Estes Fluidos são formados por partículas finas de materiais orgânicos ou inorgânicos em líquidos dielétricos e têm grande aplicação aeronáutica, medicina e com Fluidos de vedação. Sob a influência do campo elétrico, as partículas destes fluídos se alinham, formam uma estrutura de filamento na direção do campo, a qual resiste ao escoamento do Fluido ER. Neste trabalho sintetizou-se o sólido sulfato de hidrazina ? liito e analisou-se as características elétricas e reológicas da suspensão eletroreológica sulfato de hidrazina-litio em óleo de silicone. Os resultados experimentais foram obtidos para os diversos parâmetros: temperatura (20,40,60 graus Celsius), intensidade de campo elétrico (0 até 7 kilovolts por milímitro), diâmetro de partículas (menores que 37, 62,5 e 89,5 microns), a fração em peso de sólidos (20,30,35 por cento em peso), viscosidade cinimática do óleo de silicone (200, 350 e 1000 centiStokes). As propriedades reológicas das diferentes suspensões foram determinadas em vum reomatro rotatório Haake modelo RV20 com um sistema de medida CV20ER equipado com um fonte de alta tenção. As suspensões estudadas exibiram fortes variações de suas características reológicas de Fluido não newtoniano sob ação do campo elétrico, de acordo com fenômeno reportado na literatura ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digitalAbstract: Eletro-rheological Fluids (ER) are substances that have their optical, electrical volumetric, acoustic and mechanic properties altered when in presence of na external electrical field. These Fluids are compesed by fine particles of organic and inorganic material in di-electrical liquids and have a large application in the automotive industry, hydraulic industry, robots industry, aeronautic, medicine and as Seal Fluid. Under the influence of an electrical fied, the particles of these Fluids are lined up, generating a structure aligned in the field direction. This structure reduces the ER Fluid flowing capacity. In this work, lithium hydrazinium sulfate solid was synthesized. The electrical and rheological characteristics of the eletro-rheological suspension of the lithium hidrazinium sulfate in silicon oil were analysed. Experimental results were obtained for the following parameters: temperature (20,40,60 degrees Celsius), electrical field intensity (from 0 to 7 kilovolts per milimetre), particles diameters (smaller than 37, 62,5 e 89,5 micro), solid weight percent (20,30,35 percent in weight), silicone oil kinematic viscosity (200,350 and 1000 centistokes). The rheological properties of the different suspensions were determined in a rotatory rheometer Haake model RV 20 with a measurement system CV20ER, including a high power supply. The analysed suspension showed strong variations of their non-Newtonian rheological characteristics under the electrical field, according to what reported in the previous literature ...Note: The complete abstract is available with the full electronic digital thesis or dissertation

Wanlei Wang - One of the best experts on this subject based on the ideXlab platform.

  • Open Access Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    2016
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Abstract: Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system

  • Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    The Open Mechanical Engineering Journal, 2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system.

  • Study on Nonlinear Vibration and Crack Fault of Rotor-bearing-Seal Coupling System
    2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    The nonlinear dynamic model of rotor-bearing-Seal system with crack in shaft is set up based on the coupling model of nonlinear oil-film force and Muszyska's nonlinear Seal Fluid force. The dynamic vibration characteristics of the rotor-bearing-Seal system and the effects of physical and structural parameters of labyrinth Seal and crack fault on movement character of the rotor were analyzed. The increases of Seal length, Seal pressure differential, Seal radius and axial velocity are in favor of the stability of the system, and it of Seal gap and crack depth are not in favor of the stability of the system. Copyright © 2014 IFSA Publishing, S. L.

Yuegang Luo - One of the best experts on this subject based on the ideXlab platform.

  • Open Access Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    2016
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Abstract: Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system

  • Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    The Open Mechanical Engineering Journal, 2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system.

  • Study on Nonlinear Vibration and Crack Fault of Rotor-bearing-Seal Coupling System
    2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    The nonlinear dynamic model of rotor-bearing-Seal system with crack in shaft is set up based on the coupling model of nonlinear oil-film force and Muszyska's nonlinear Seal Fluid force. The dynamic vibration characteristics of the rotor-bearing-Seal system and the effects of physical and structural parameters of labyrinth Seal and crack fault on movement character of the rotor were analyzed. The increases of Seal length, Seal pressure differential, Seal radius and axial velocity are in favor of the stability of the system, and it of Seal gap and crack depth are not in favor of the stability of the system. Copyright © 2014 IFSA Publishing, S. L.

Songhe Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Open Access Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    2016
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Abstract: Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system

  • Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System
    The Open Mechanical Engineering Journal, 2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    Based on the coupling model of nonlinear oil-film force and nonlinear Seal Fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system.

  • Study on Nonlinear Vibration and Crack Fault of Rotor-bearing-Seal Coupling System
    2014
    Co-Authors: Yuegang Luo, Songhe Zhang, Wanlei Wang
    Abstract:

    The nonlinear dynamic model of rotor-bearing-Seal system with crack in shaft is set up based on the coupling model of nonlinear oil-film force and Muszyska's nonlinear Seal Fluid force. The dynamic vibration characteristics of the rotor-bearing-Seal system and the effects of physical and structural parameters of labyrinth Seal and crack fault on movement character of the rotor were analyzed. The increases of Seal length, Seal pressure differential, Seal radius and axial velocity are in favor of the stability of the system, and it of Seal gap and crack depth are not in favor of the stability of the system. Copyright © 2014 IFSA Publishing, S. L.