Display omitted
•The developed dynamic model of the vibro-compactor simulates the accelerations.•The acceleration is an important parameter that can be used to diagnose problems.•The difference ...between predicted and measured rod accelerations decreased by 81%.•The rod acceleration can be controlled by varying the balloon pressure.•The model obtained is directly applicable to the industry.
The vibro-compaction is the most common technology employed for the formation of green carbon anodes in the primary aluminum industry. The acceleration is an important parameter used to predict the performance of the equipment. In this paper, a dynamic model of the vibro-compactor with two degrees of freedom is developed. The dynamic model simulates the acceleration of vibration table, the guide rod and the changes in various vibro-compaction parameters. Subsequently, an experimental method was established for measuring the dynamic rigidity of anode paste. The developed model gives a good approximation of acceleration compared with those obtained by experimental tests.
The diversity of physical and mechanical properties of aluminum alloys leads to develop a variety of manufacturing processes including the semi-solid casting process. Fatigue failure is considered ...the most common problem occurred in automotive engineering applications by which the vehicle components, mainly suspension system parts, fail under conditions of dynamic loading. It is well known that the fatigue life of aluminum castings, mainly A357, is very sensitive to casting design as well as to casting defects and microstructure constituents. The fatigue characteristics of automotive lower suspension arm made of semi-solid A357 aluminum castings have been investigated using metallurgical and analytical approaches. The critical stress areas capable of initiating cracks during fatigue tests are detected by using fatigue experimental design for real part materials by the installation of strain gages on the suspension arm to calculate maximum stress; further more, analytical approach is applied using modelling software. Microstructure characteristics of the semisolid A357 under T6 heat treatment conditions are examined using scanning electron microscope. The results show that using the SEED casting technology (Swirled Enthalpy Equilibration Device) has an efficient effect on the mechanical and metallurgical characteristics of real part materials that are also affected by castings design.
Quebec wood species, jack pine (Pinus banksiana Lamb.) and aspen (Populus tremuloides Michx), were thermally treated in an industrial furnace using 'Bois Perdure' technology. The species were heated ...from room temperature up to their respective maximum heat-treatment temperatures. The mechanical properties, dimensional stability, and mold resistance of these species were determined and compared with those of untreated wood. This information is essential for the users of these new products. Results indicate that modulus of rupture (MOR) of heat-treated jack pine and aspen decreased, whereas modulus of elasticity (MOE) of the same heat-treated species increased, respectively. All the tests were carried out with a different set of specimens. Results show that the dimensional stability of heat-treated jack pine and aspen was improved considerably after heat treatment. Mold resistance of heat-treated jack pine was improved compared to the untreated sample; mold resistance was improved for heat-treated aspen; however, it was not significantly different from the untreated aspen.
The primary purpose of this paper is to analyze the effects of vibrations on the comfort and road holding capability of road vehicles as observed in the variation of different parameters such as ...suspension coefficients, road disturbances, and the seat position. This study required the development of a mathematical model to simulate the dynamic behavior of a 3-D vehicle. With this model, various types of non-linear suspensions such as active and semi-active suspensions may be investigated. The results obtained from the simulation of the 3-D vehicle demonstrate that the use of active and semi-active suspension models on road vehicles prove to be beneficial for comfort without unduly compromising road holding capability.
PDF
