Design and testing of a pulley and cable actuator for large ball valves

Pugi, Luca; Galardi, Emanuele; Pallini, Giovanni; Paolucci, Libero; Lucchesi, Nicola

doi:10.1177/0959651816642093

Cited by 17 publications

(6 citation statements)

References 14 publications

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“…To simplify the system-level analysis, the valve dead zone and hysteresis are ignored. In many studies a second-order system is used to present the valve opening in terms of control voltage 30,31 :…”

Section: System Modelingmentioning

confidence: 99%

Characteristics study of electro-hydraulic load-sensing control system for mobile machines

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The hydro-mechanical load-sensing control is an efficient system solution to working function of mobile machines since the system pressure always adapts to the highest load pressure. The main issue of this system is its instability problem caused by hydro-mechanical feedback control. Moreover the pressure margin between system and load pressure set by the load-sensing compensator is usually fixed and has less control flexibility. Therefore, an electro-hydraulic load-sensing control system occurs, where the load pressure is sensed by pressure transducer and load-sensing control is achieved electronically. It eliminates the hydro-mechanical feedback control loop and has more control flexibility. The previous studies mainly focus on the system function, controller design and system efficiency. However the quantitative analysis of system characteristics has not yet been studied. Therefore, in this paper a method is provided to investigate the influences of pump displacement dynamics and preset pressure margin on system control performance. A hydraulic load-sensing control test rig is developed. Results show a good agreement between simulation and test results. The pressure margin fluctuation is reduced by using a pump with faster displacement dynamics and a larger cut-off frequency of load velocity control is obtained with a larger preset pressure margin however this results in lower system efficiency.

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Section: System Modelingmentioning

confidence: 99%

Characteristics study of electro-hydraulic load-sensing control system for mobile machines

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…For what concerns proposed actuators, it is supposed to adopt a control bandwidth of exerted forces limited to 40 Hz, which is a feasible value as example for a servo-hydraulic systems (Pugi et al, 2016(Pugi et al, , 2020. One of the main features of the proposed system is the adoption of a hyperstatic structure.…”

Section: Force Control Of the Manipulatormentioning

confidence: 99%

New mechanism for press-fit processes: preliminary analysis

Fiorineschi

Pugi

Rotini

2021

WJE

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Purpose The purpose of this paper is to present an alternative solution for press-fit technology processes, which could improve the precision of the positioning movements and the stiffness of the structural elements. Design/methodology/approach A concept is presented and the related kinematics is described. Then, preliminary embodiment evaluations have been performed in terms of kinematics, force control and load distribution on the main structural elements. Findings Thanks to the additional leg, the proposed solution allows a preload that is capable of compensating the backlash of joints. The particular structure with four extendible legs and eight cardan joints ensures the parallelism between the ground and the plate holding the end effector, without any need of additional controls. However, it implies that the legs are not subjected to pure tension–compression stresses. Research limitations/implications This work is focused on the conceptual phase of the design process, with only preliminary embodiment analysis that paves the way for subsequent and more detailed design steps. Especially concerning the actual stiffness of the system, comprehensive evaluations could be performed only after the identification of the particular parts/devices used to implement the main functional elements. Originality/value To the best of the authors’ knowledge, this is the first research work that comprehensively describes and analyzes the considered kinematics, within a real industrial application context.

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“…To that purpose, and to verify a wide range of different loading and operating conditions, authors are also considering the application of Hardware In the Loop Testing techniques. The latter have been successfully applied in previous experiences concerning the robust design of actuators for safety relevant applications in the oil and gas sector (Pugi et al, 2017c(Pugi et al, , 2016.…”

Section: Conclusion and Future Developmentsmentioning

confidence: 99%

Redesigning the cycloidal drive for innovative applications in machines for smart construction yards

Allotta

Fiorineschi

Papini

et al. 2020

WJE

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Purpose This study aims to carry out an investigation of design approaches that should be used for the design of unconventional, innovative transmission system for construction yards to privilege a smooth behaviour efficiency, and the use of innovative production techniques. Results are quite surprising, as with a proper method it is possible to demonstrate that a cycloidal drive with Wolfrom topology should be an interesting solution for the proposed application. Design/methodology/approach With a functional approach, also considering materials and specifications related to the investigated application, it is possible to demonstrate that possible optimal solutions should be quite different respect to the ones that can be suggested with a conventional approach. In particular for proposed applications constraints related to encumbrances, the choice of new material has led to the innovative unconventional choice of a Wolfrom cycloidal speed reducer. Findings Provided solution is innovative respect current state of the art for machine currently used in construction yards: in terms of adopted transmission layout; in terms of chosen materials, resulting in an innovative solution. Research limitations/implications Current research has strong implications on the adoption of polimeric materials for the construction of reliable transmission for harsh industrial environment as the proposed case study (concrete mixer for construction yard). Originality/value Proposed transmission system is absolutely original and innovative respect current state of art also considering proposed materials and consequently production methods. This is an example of transmission designed to be built with polymeric materials by optimizing chosen topology respect to chosen material.

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Design and testing of a pulley and cable actuator for large ball valves

Cited by 17 publications

References 14 publications

Characteristics study of electro-hydraulic load-sensing control system for mobile machines

Characteristics study of electro-hydraulic load-sensing control system for mobile machines

New mechanism for press-fit processes: preliminary analysis

Redesigning the cycloidal drive for innovative applications in machines for smart construction yards

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