Design of Delivery Valve for Hydraulic Pumps

Formato, Andrea; Guida, Domenico; Ianniello, Domenico; Villecco, Francesco; Lenza, Tony Leopoldo; Pellegrino, Arcangelo

doi:10.3390/machines6040044

Cited by 26 publications

(12 citation statements)

References 39 publications

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“…It was, thus, possible to design an optimized cochlea and identify volume changing DV c after every pitch, similar to DV p realized by an optimized membrane press. The optimized cochlea is reported in Figures 2 and 3 [41][42][43]. Table 4 notes that with the considered geometry for the variable pitch conical helicoid, the DVc volume change obtained is similar to the DVp volume change obtained with an optimized membrane press.…”

Section: Helicoidal Screw Press Geometrysupporting

confidence: 52%

Design and Development of a New Press for Grape Marc

et al. 2019

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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.

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Section: Helicoidal Screw Press Geometrysupporting

confidence: 52%

Design and Development of a New Press for Grape Marc

et al. 2019

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“…A linear elastic model is not able to catch the finite deformation of the pipe [37]. All of that is also considered in the design of complex mechanical systems [38][39][40] that involved models with hysteresis [41,42] aimed to solve thermodynamic problems [43] and to perform dynamic analysis [44][45][46] and optimization [47][48][49] evaluating also the structural displacements.…”

Section: Mathematical Modelmentioning

confidence: 99%

Fluid–Structure Interaction Modeling Applied to Peristaltic Pump Flow Simulations

et al. 2019

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In this study, fluid–structure interaction (FSI) modeling was applied for predicting the fluid flow in a specific peristaltic pump, composed of one metallic roller and a hyperelastic tube pumping a viscous Newtonian fluid. Hyperelastic material dynamics and turbulence flow dynamics were coupled in order to describe all the physics of the pump. The commercial finite element software ABAQUS 6.14 was used to investigate the performance of the pump with a 3D transient model. By using this model, it was possible to predict the von Mises stresses in the tube and flow fluctuations. The peristaltic pump generated high pressure and flow pulses due to the interaction between the roller and the tube. The squeezing and relaxing of the tube during the operative phase allowed the liquid to have a pulsatile behavior. Numerical simulation data results were compared with one cycle pressure measurement obtained from pump test loop data, and the maximum difference between real and simulated data was less than 5%. The applicability of FSI modeling for geometric optimization of pump housing was also discussed in order to prevent roller and hose parts pressure peaks. The model allowed to investigate the effect of pump design variations such as tube occlusion, tube diameter, and roller speed on the flow rate, flow fluctuations, and stress state in the tube.

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“…This effect as a function of the length-to-thickness ratio. It has been noted by different authors [25][26][27][28] that the transverse shear effect:…”

Section: Testingmentioning

confidence: 99%

Vibration-Based Experimental Identification of the Elastic Moduli Using Plate Specimens of the Olive Tree

et al. 2019

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Mechanical parameters of the olive wood plate have been computed by data inversion of vibrational experimental tests. A numerical-experimental method has allowed the evaluation of the two transverse shear moduli and the four in-plane moduli of a thick orthotropic olive tree plate. Therefore, the natural flexural vibration frequencies of olive trees plates have been evaluated by the impulse technique. For our purposes, we define the objective function as the difference between the numerical computation data and the experimental ones. The Levenberg-Marquardt algorithm was chosen as optimization strategy in order to minimize the matching error: the evaluation of the objective function has required a complete finite element simulation by using the ANSYS code. As input, we have used the uniaxial test data results obtained from the olive plates. The converged elastic moduli with n = 10 natural modes were E 1 = 14.8 GPa, E 2 = 1.04 GPa, G 12 = 4.45 GPa, G 23 = 4.02 GPa, G 13 = 4.75 GPa, ν 12 = 0.42, and ν 13 = 0.42. The relative root mean square (RMS) errors between the experimental frequencies and the computed one is 9.40%. Then, it has been possible to obtain a good agreement between the measured and calculated frequencies. Therefore, it has been found that for plates of moderate thickness the reliability of the estimated values of the transverse shear moduli is good.

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Design of Delivery Valve for Hydraulic Pumps

Cited by 26 publications

References 39 publications

Design and Development of a New Press for Grape Marc

Design and Development of a New Press for Grape Marc

Fluid–Structure Interaction Modeling Applied to Peristaltic Pump Flow Simulations

Vibration-Based Experimental Identification of the Elastic Moduli Using Plate Specimens of the Olive Tree

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