Pneumatic Systems
Mostrando 13-24 de 29 artigos, teses e dissertações.
-
13. Influência do alimentador de sólidos na fluidodinâmica do transporte pneumático.
Pneumatic transport is an operation where powdery and granular materials are conveyed through a pipeline suspended in a gas flow. It is usually found in several industries segments and it is used as a carrier, such as, in beans production; drying operation, like grain dryers; or as reactors, in cracking catalytic reactions, combustion operations and precalci
Publicado em: 2007
-
14. Um analisador fluxo-batelada com bomba-pistÃo aplicado à preparaÃÃo de soluÃÃes de calibraÃÃo e microemulsÃes: determinaÃÃo de metais em Ãgua mineral e gasolina por GF AAS
The development of flow analyzers and continuous monitoring of some chemical processes have lead to the design of flow manifolds more cheap and simplified, with potential for miniaturization. For these purposes, the use of flow systems seems to be an attractive option. Among these systems, the Flow-batch analyzers (FBA) were applied with success in the imple
Publicado em: 2007
-
15. DEVELOPMENT OF A THREE DEGREE-OF-FREEDOM PNEUMATIC LINK FOR FLEXIBLE ROBOTIC MANIPULATORS / DESENVOLVIMENTO DE UM ELO PNEUMÁTICO DE 3 GRAUS DE LIBERDADE PARA MANIPULADORES ROBÓTICOS FLEXÍVEIS
Recently, the concept of flexible manipulators has attract great interest. These devices present a continuously deforming vertebral column, in opposition to the traditional robotic manipulators link/joint/link with rigid links. Flexible systems offer a potential increase in the capacity of interaction with the environment, being apt to adjust itself to the c
Publicado em: 2006
-
16. Farm machinery utilization in a row-crop producer region / Diagnóstico da mecanização em uma região produtora de grãos
The intensive farm machinery use in Brazil started in the 1960?s with the establishment of national tractor industry and followed by farm machinery industries. These industries promoted a quick expansion in agricultural mechanization, which today is essential. Although with undeniable benefits, agricultural mechanization was influenced by external technology
Publicado em: 2006
-
17. Estudo do desempenho de um alimentador de sólidos tipo válvula-L de pequeno diâmetro.
A controlled and uniform solids feeding in process equipment is important for a good performance operation, and distinct work conditions may be obtained depending on the feeding systems characteristics. In this work, a solids feeding system was studied aiming to have its performance characterized and analyzed. The solids feeder is a non-mechanical valve know
Publicado em: 2005
-
18. Improving the power consumption in pneumatic conveying systems by a daptive control of the flow regime
The pneumatic conveying of solids in a gas stream is a recurrent process in petrochemical industries. However, due to practical limitations the majority of existing systems have capacities ranging from 1 to 400 tones per hour over distances less than 1000 m, mainly because of a high power consumption per transported unit mass. More specifically, to avoid the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12
-
19. Comparação do desempenho de um sistema de refrigeração para resfriamento de liquido, controlado a diferentes modos de controle. / Comparison of the system performancefor liquid refrigeration, controlled cooling the different ways of control.
A prototype of refrigeration system in a chiller plant was assembled and instrumented for development of a conventional and fuzzy controllers. Fuzzy controls are increasingly being applied to industrial process especially in process with complex mathematical modeling. The capacity of action in a system controlled by a fuzzy logic is based only on a expert kn
Publicado em: 2003
-
20. Propulsor pneumático versátil e isento de pulsação para sistemas de análise em fluxo
Aquarium air pumps are proposed and evaluated as pneumatic liquid propulsion devices for flow injection and continuos flow analysis (FIA and CFA) systems. This kind of pump is widely available at a very low cost and it can sustain a pressure around of 4 psi (0.28 bar) indefinitely. By applying this air pressure onto a solution contained in a reservoir flask,
Química Nova. Publicado em: 2001-12
-
21. Combinación de sistemas de flujo de baja y alta presion para la determinacion de Mg, Ca y Sr en salmueras por espectrofotometria de absorcion atomica con llama
This article describes the combination of low- and high-pressure flow systems for the determination of Magnesium, Calcium and Strontium by flame atomic absorption spectrometry (FAAS). In the low-pressure system a short C-18 RP column (length 0,5 cm) was utilized for the preconcentration/matrix separation step, xylenol orange was used as chelating agent and t
Química Nova. Publicado em: 2001-04
-
22. Estudo das estruturas de membrana: uma abordagem integrada do sistema construtivo, do processo de projetar e dos métodos de análise / Study of membrane structures: an integrated approach of the constructive system, design process and analysis methods
Membrane structures used in roofs are constructive systems formed mainly by structural membrane, which has also the function of sealing. Structural membranes are flexible sheets that resist to external loads due to their form, to their physical characteristics and to their pre-stressing. The pre-stressing of the membrane can be achieved either through its st
Publicado em: 2001
-
23. Estudo experimental de uma valvula conica para controle da descarga de solidos em leito fluidizado
Feed valve are essential devices in gas-solid systems, in process as fluidized bed drying, pneumatic transport, coal combustion, biomass gasification and synthesis reactions in fluidized beds. All require a feed valve for the particulate solid to control the mass flow rate entering andlor leaving the processo. This work presents the development and the exper
Publicado em: 2001
-
24. Simulação orientada a objeto do transporte pneumatico
Particle transportation by a gas stream, commonly named as pneumatic conveying, has been ftequently used in a large variety of industrial processes. This is due not only to the diversity of materiais produced and handled in a granulated form, as also to the great number of possible applications of that operation, which includes since the simple displacement
Publicado em: 2000