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This paper deals with the mechanical solutions for installation of innovative direct-drives suited for steering gears onboard ships. The work is comprised in a research project commissioned by the Italian Navy. The research aims to realize a full-electric and oil-free drive for actuation of hydraulic loads in the perspective of more “green ships”. The electrical drives proposed are based on a fractional...
Alternatives to hydraulic drives used on board ship are under study for the Italian Navy in order to reduce the use of the oil which cause environmental problems and high cost. The hydraulic system drive used onboard ship are affected by low efficiencies and generally require intensive maintenance, very high encumbrance. So that the Italian Navy has commissioned a research project for the construction...
This paper investigates the hydraulic system drive used onboard ships to actuate stabilizing fins. The hydraulic drives are often characterized by low efficiencies, heavy maintenance, frequent oil leaks and large weight and size. To overcome these draw-backs, in this paper a concept design of a full-scale permanent magnet linear synchronous motor directly coupled to the shipboard fin stabilizer, is...
The use of linear machines (LMs) is increasing in research and industry fields. All kinds of LMs are studied: synchronous, induction, flux switching. Research is leading to overcome the known drawbacks of all these machines. Anyway the use of innovative direct-drive solutions are under study to obtain more efficient energy conversion, such as for marine field. As alternative to classical systems,...
Hydraulic drives used on board ship to empower rudders, stabilizing fins, anchor winches, etc., are often characterized by low efficiencies, heavy maintenance, frequent oil leaks and large weight and size. To overcome these drawbacks, oil-free inverter-fed alternative drives can be conceived. In this paper a concept design of a full-scale permanent magnet linear synchronous motor directly coupled...
Hydrostatic drives used on board ships are often characterized by low efficiencies, heavy maintenance, frequent oil leaks and large weight and size. To overcome these drawbacks, oil-free inverter-fed alternative drives can be proposed. This paper analyzes the ship rudder hydraulic drive performances, and a proposal for improvements is shown. A full-scale permanent magnet linear synchronous motor directly...
INTESA is an innovative vertical envelope for residential, industrial and service tertiary buildings. It is a drywall façade system with high thermal and acoustic properties, embedding electrical and plumbing systems. The system was developed over two years by a multidisciplinary team, which involved researchers, manufacturers and consultants. An integrated approach has been the key element to design...
An approach to machine modeling by using finite reluctances is proposed. The finite reluctance approach is well suited for fast modeling and dynamic simulation of electrical machines in general and of fractional-slot surface-mounted permanent magnet machines in particular. The latter usually have very large air gap and slots, with relevant leakage and large tangential components of flux density in...
The finite reluctance approach is very well suited for fast modeling and dynamic simulation of permanent magnet synchronous machines with inverter feeding. This paper shows validating simulations, in both steady-state and transient conditions, carried out for a permanent magnet linear motor designed for on board ship load actuation. The basics of the method are resumed. The simulations obtained by...
A fault-tolerant machine used for safety-critical tasks must a) guarantee at least a reduced-performance operation in case of partial machine fault and b) guarantee avoidance of drive mechanical jam/stall in case of total machine fault, to allow for the intervention of the back-up systems. Classical hydrostatic transmissions used on board ships for critical tasks such as rudder and stabilizing fin...
The finite reluctance approach is based on a simple synergy between a basic magnetic domain decomposition rule and the voltage balance at the terminals of any winding acting in the domain. The finite reluctance approach is thought as a tool for fast dynamic simulations of any kind of machine, but it is particularly adapt for irregular flux geometries as in fractional-slot surface-mounted permanent...
Today, the Infrastructure as a Service (IaaS) cloud environments represent a market share on which many big economical players (Amazon, Microsoft, Rack space) are converging. The hetereogenity and the degree of customization of Cloud features and funcionalities supplied, the different pricing model adopted, the different QoS strategies proposed to the customer make this market very fragmented. Within...
Estrogens are known to influence functional properties of mammalian spermatozoa inducing rapid responses through the classical estrogen receptors (ERα and ERβ). Recently, the G protein‐coupled estrogen receptor (GPER) has been identified as mediator of fast non‐genomic estrogen effects in different cells. This work investigated the expression of GPER in human and pig spermatozoa using immunofluorescence,...
A novel planar differential ultra-wideband (UWB) antenna was designed and implemented on low-cost FR4 substrate and characterized experimentally. The antenna was used in the implementation of a complete UWB pulse radar sensor obtained by co-integrating a system-on-a-chip UWB pulse radar packaged in QFN32 package with two antennas, one for the transmitter and one for the receiver. The experimental...
The reliability is a key requirement in electric actuators to be used for moving ship control surfaces. This paper addresses a fault-tolerant design for an innovative naval actuator based on an inverter-fed permanent magnet linear synchronous motor. Due to the highly non-conventional actuator concept, a detailed FEM modeling approach is presented in this paper for comparison of different design solutions...
The use of virtualization technologies and the introduction of multi-core processors have strongly influenced the way of designing and developing software systems. Thus controlling and effectively managing them is became a fundamental issue, especially in distributed scenarios, as Clouds or Grids, providing QoS-assured services on demand. In this work, the authors propose the adoption of a management...
IaaS cloud providers, as Amazon or Rackspace, provide their users with the abilities to create an own virtual environment, populate it with their applications, and manage a wide range of critical issues (e.g. scale up/down, load balancing, faults) by means of ad hoc services. One of the limits of these cloud systems is the lack of tools that enable the user to have a direct knowledge of the physical...
The scale of the current cloud infrastructures and the heterogeneity of applications running on them pose significant challenges about resources management on clouds. This paper proposes a monitoring system that allows user to collect and aggregate data in a form flexible and adequate to the integration with the management policy that he adopt. This monitoring system is supplied by a a configurable...
The current implementations of File System for distributed environments are mainly storage-oriented, have rigid schemas and are little configurable. These aspects make them unsuitable for handling the dynamicity of cloud environments. In this paper, the authors introduce the concept of File System as a Services (FSaaS), providing an high configurable cloud service that enables distributed applications...
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