Design and Development of a New Press for Grape Marc

Abstract

The purpose of this research was to determine the optimal geometry of a variable pitch conical helicoid to be used in a pressing machine for grape pomace, also known as grape marc. This study attempted to understand if the optimized geometry of the considered helicoid after every pitch resulted in volume decrease DVc, equal to that obtained during the pressing phase of grape pomace DVp, using an optimized membrane press. The conical helicoid with variable pitch was replaced in a machine that offered continuous pressing of grape pomace using a cylindrical helicoid with constant pitch (constant pressure distribution, not optimized, along the cochlea axis). As this was a machine already available in the market, the overall dimensions were already established—5.95 m in length and 1.5 m in width. The pressure distribution p1 and volume change DVp, obtained during the grape pomace pressing phase in the optimized membrane press (producing high-quality wine) was taken into consideration in this research. Furthermore, the optimized pressure distribution p1 was applied in seven phases during the pressing process, and a consequent volume change value DVp was obtained for each phase. Therefore, this study determined the geometry of the variable pitch conical helicoid, which, after every pitch, resulted in volume changing DVc that was similar to the volume changing DVp obtained by the optimized membrane press. For this scope, calculations were realized using the Mathematica 10 program code, which, on being assigned the overall dimensions, slope angle of the helicoid, and volume for the first pitch value, determined the radius and pitch values of the helicoid, total volume, and volume change DVc. It was also noted that by appropriately varying the geometric parameters (taper and pitch of the helicoid), different options of pressure distribution on grape pomace can be obtained, thus enabling improvement and optimization of product quality.

Noise Reduction in Spur Gear Systems

“…The parameters that affected this second type of analysis were related to the evaluation of the acoustic emissions, for which we focused on the friction, lubrication, and rotation speed. The second type of material was not included among the variables, as the required number of simulations involving analyses requiring long computation times would have greatly increased [ 43 , 44 ].…”

Development and Testing of a Methodology for the Assessment of Acceptability of LKA Systems

“…Hence, the 0.2 G value was chosen as the upper limit below which to consider the maneuver was completed and the stability was restored; this choice is also confirmed by observing the telemetry graphs in which it is noted that, in the straight path without obstacles, the car operates stably within the predefined range [−0.2 G, 0. To evaluate the stability of the vehicle, the parameters on which attention was focused are those relating to lateral acceleration and steering angle [38][39][40], the same as those used by the control logic of the LKA system and by the ESP stability control system to communicate with the control unit. These parameters are recorded by telemetry software (Figures 4 and 5).…”

Study of Tank Containers for Foodstuffs

“…Today, tank containers can carry a wide range of very different products, such as liquid food products, such as wine, fruit juices, oil, starch, milk, sugar, etc. The most requested accessories for tank containers are inherent to the thermoregulation of the transported product [22][23][24][25]. Furthermore, we must keep in mind that the tank container market is and will be a niche market compared to the box container market, but not negligible.…”