20 research outputs found
The Importance of Optimal Design in Outdoor Light Source Positioning
In this work we underline the importance of the optimal design for outdoor
light systems such that light posts and sources are placed correctly.
We present a case study where we considered a city road section
equipped with LED sources. On this section, we measured technical
luminous coefficients, which were then compared with values listed
in standard and normative documentation. Based on this we did a new
design that had to follow certain requirements on street and lighting
post configuration. Comparing the two designs we conclude that, to
have an optimal street light system, the engineer must aim for the best
possible design and consider this when deciding on the position of the
light sources
Quadcopter Stability Increased by PID Adaptive Tuning
Today's World is getting more efficient in mail deliveries or other applications
using autonomous vehicles as drones because of their improved
performances. The quadcopter appertains to the drone family having
the advantage of flying stability light weight and accurate maneuverability.
This paper describes the design and the adaptive tuning for dynamic
control of a quadcopter using PID control technique. The experimental
tests show improved response related to the previous results
under the same input condition
Rapid Calculation Program of Certain Sizes used in design of Synchronous Generators
This paper presents a program of rapid determination of certain sizes
required in the design of synchronous machines using Mathcad
software. During the design of electrical machines are phases in which
certain sizes are extracted from different tables depending on certain
variables. This operation is difficult and sometimes hard to do. To
eliminate this problem and greatly shorten the time of determination of
sizes and to ensure accurate values we have designed a program
allowing even interpolation between two known values. The program
developed applied, in this paper, to quickly determine the value of the
voltage form factor kB and the value of the ideal polar coverage
coefficient αi of polar step τ
Study Regarding the Identification of an Internal Combustion Engine
The paper presents the results of the scientific investigations performed
on an Otto engine. One conducted surveys on the analytic and experimental
modelling of the internal combustion engine, considered as
automated system element. The results of the analytical study are concretised
in the mathematical model of the engine, expressed in the operational.
The experimental results are concretised in the indicial response
in rotating speed, as well as in the determination of the constants
of interest. The investigation methods used in conducting the
survey were: experimental identification based on the indicial response
of the engine and the analytical identification based on the mathematical
models of diverse engine subsystems
Technical performance analysis of a 40 kW photovoltaic installation
To reduce the consumption of classically produced electric energy,
which is an important green gas pollution factor, various renewable
energy sources are now implemented on larger and larger scale. Both
industrial and household consumers make use of such renewable energy sources. This work presents the characteristics and performance of a 40 kW photovoltaic installation mounted on the roof of an industrial production hall. The design and the implementation of the photovoltaic installation allows it to function while connected to the local power grid. On-site measurements have shown that the installation ensures symmetric voltages and currents, functioning at the planned parameters
The design and execution of a laboratory micro hydroelectric power plant
The paper presents a laboratory micro hydroelectric power plant destined to applicative activities. The hydraulic turbine is a Pelton turbine, rebuilt by fast prototyping in Geomagic Design X and printed on a 3 D printer. The turbine casing and the afferent ele-ments are made in-house. The hydrogenator is synchronous being an alternator from a Dacia vehicle. The hydrogenerator load is constituted by 3 groups of light bulbs. We analysed the working of the micro-hydroelectric power plant in idle run and for different loads. As a result of the analysis we found out that it stably works for different loads and by its open construction it is useful for de-veloping students’ ability to understand the phenomena. The installation designed and executed is useful for the engineering students as the pandemic forbids the thematical visits in hydro-energetic facilities
On the Electromagnetic Stresses Impact on the Synchronous Generator Costs
In line with the nowadays requirements, the synchronous generators
must fulfill the technical specifications and their costs should be as low
as possible. For this, the electromagnetic stresses, which significantly
influence the synchronous generator costs, must have optimal values.
The use of optimal designs helps achieve this objective. In this work we
show how the current layer A and the air gap magnetic displacement Bδ influence the generator’s costs
Notes on LED Installations in Street Illumination
The paper presents a study made on choosing LED street lighting installations,
such that the quality requirements for exterior artificial lighting
are fulfilled. We analyze two types of LED street lighting installations
from a technical point of view, together with lighting level and
brightness values obtained during the measurements. Following on the
field measurements, the lighting quality parameters are calculated, and, for the lighting installation with the best performance, optimal
mounting suggestions are made. The optimal quality parameters are
calculated by simulations using the Dialux software. The same software
and the same light sources we also compute an optimal street lighting
by determining the size of the installation that provides the best lighting
parameter values