Search results for "cost"
showing 10 items of 5421 documents
Low stiffness variation in structural systems: identification and localization
2008
When a very low damage occurs, the undamaged structural response totally overlaps the damaged one either in time domain or in frequency domain; on the other hand, by considering some characteristics of the analytical signal, such as the phase, it has been possible to develop a damage identification procedure that allows the identification and localization of damage even if the structure experiences multiple damages at the same time. This procedure is also robust with respect to the presence of measuring noise. In order to assess the validity of the proposed damage identification procedure, numerical applications on single degree of freedom and 2 DOF and 4 DOF are presented using data record…
Finite Element Simulation of Multilayer Metal Cylinder Head Gaskets
2006
ABAQUS gasket elements are an efficient and flexible tool to study gasket applications. Nevertheless the usage of the ABAQUS gasket elements is not limited to gasket analysis, but it provides an effective improvement in structural analysis. The results point out that both the predicted contact pressure and the predicted stress distribution depend on the mesh topology. Several combinations of mesh dimension and topology are investigated. The purpose is the definition of a calculation methodology and the demonstration of the application potentiality. Complex models analysis highlights that the set methodology constitutes a very effective tool for the design and optimization of gasket, cylinde…
Developments Around the Activity-Based Costing Method: A State-of-the Art Literature Review
2007
This paper analyzes the management accounting applications which try to improve the Activity-based Costing method. In the first part, we describe them using the Strategic Management Accounting stream. Then, we present the main features of these applications. In the second part, we examine in detail two of these features: The widening of the analysis perimeter and the relevant level of details to analyze the costs. Finally, we analyze several proposals: Customer-driven ABC, Inter-organizational Cost Management, Resource Consumption Accounting and Time-driven ABC.
Interaction between Longitudinal Shear and Transverse Bending in Prestressed Concrete Box Girders
2017
In box girder bridges, the quantity and distribution of reinforcement to be put in concrete elements of sections can be evaluated only by considering the deformation of the cross section in addition to the longitudinal analysis of the static scheme, establishing the entire state of stress of box sections. This leads to a need to evaluate the interaction between internal forces obtained by the global analysis and the ones obtained by the local analysis of the cross sections. The frame effect implies the elastic deformation of slabs and webs, whereas eccentrically applied loads lead to cross-section distortion with the loss of the box shape. Hence, the reinforcement is strongly influenced by …
Influence Of Lateral Load Distributions On Pushover Analysis Effectiveness
2008
The effectiveness of two simple load distributions for pushover analysis recently proposed by the authors is investigated through a comparative study, involving static and dynamic analyses of seismic response of eccentrically braced frames. It is shown that in the upper floors only multimodal pushover procedures provide results close to the dynamic profile, while the proposed load patterns are always conservative in the lower floors. They over-estimate the seismic response less than the uniform distribution, representing a reliable alternative to the uniform or more sophisticated adaptive procedures proposed by seismic codes. © 2008 American Institute of Physics.
Sensorless control of PMSM by a linear neural network: TLS EXIN neuron
2010
Sensorless vector control applied to the Permanent Magnet Synchronous Motors (PMSMs) is a very challenging subject. It permits obtaining high dinamical performance by exploiting increased reliability and also reduced cost. Among the different methodologies proposed in literature, a model based approach has been proposed here. In particular, the space vector equations of the PMSM have been re-elaborated to permit the use of a Least Squares technique. The problem has been then faced-up to with the so-called TLS EXIN neuron, which is a linear neural network able to solve the TLS problem on-line. Simulation tests have been done on both interior mounted and surface mounted machines.
A PC-based wattmeter for accurate measurements in sinusoidal and distorted conditions: Setup and experimental characterization
2012
This paper presents the development of a high-accuracy sampling wattmeter, which can be employed with both sinusoidal and distorted input signals. The proposed personal computer (PC)-based system is a simple, portable, and low-cost solution because it is based on two commercial data acquisition boards connected to a common PC. Owing to this solution, the voltage is sensed directly, avoiding expensive voltage dividers, while the current is sensed by means of a noninductive current shunt. Commercial software is also used for data processing and implementation of the virtual instrument. The setup of the PC-based wattmeter is described, with a detailed description of the correction strategy of …
New Architectural Models and Building Tradition: A Dialogue in Early Modern Sardinia - The Jesuit Church in Sassari
2014
L'architettura nella Sardegna di età moderna è caratterizzata da una forte continuità con pratiche antecedenti. Nella seconda metà del XVI secolo, nuovi modelli, legati in particolare alle nuove tendenze nel campo dell'architettura militare e il classicismo della controriforma cattolica, affiancano la tradizione costruttiva gotica.La chiesa dei Gesuiti di Sassari offre un interessante esempio di intreccio tra queste modalità architettoniche, causato da un improvviso cambio alla guida del cantiere. Giovan Maria Bernardoni, un architetto gesuita italiano, redasse il progetto iniziale della chiesa sul modello del Gesù di Roma, ed essa fu parzialmente costruita sotto la sua direzione. Dopo la s…
Feasibility analysis of a renewable hybrid energy system with producer gas generator fulfilling remote household electricity demand in Southern Norway
2016
Abstract Hybrid energy system is increasingly emerging as an option to produce energy for the remote areas. This paper presented an economic feasibility analysis of a single standalone house operating with a hybrid power plant consisting of a fixed capacity producer gas generator (2 kWe) and other renewable energy sources (Photovoltaic and wind). The National Renewable Energy Laboratory's Hybrid Optimization Model for Electric Renewable (HOMER) was employed which evaluated techno-economic analysis based on the criteria of net present cost and levelized cost of electricity. Taking the site specific daily average solar radiation, average wind speed and load data into account, renewable hybrid…
Cost Modelling In Waste Water Treatment Processes: An Empirical Analysis For Spain
2007
The reuse of resources obtained from regenerating wastewater is an absolute must both from a social and also environmental and health viewpoint. For any water reuse project to be viable, water treatment processes must be optimised. In this sense, extensive knowledge of the structure of costs associated to each of the treatment technologies available is necessary. This research applies cost modelling methodology by adjusting a series of representative functions and an empirical analysis is undertaken for a sample of wastewater treatment plants in Spain.