Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Heat transfer from a component to the ambient can be optimized, primarily by reducing the thermal resistance from the main source of heat to the ambient. At package level, reducing thermal resistance can be achieved through adding embedded thermal pads into the package, increasing the number of vias in the package's substrate, and using materials with high thermal capabilities. The research presented...
Actual paper describes two implementation methods of an elliptical low pass filter using copper disc sectors on a PCB substrate. The main idea was to replace the series resonant branches of the filter circuit with radial stubs, which have the same equivalent circuit at high frequencies. Different approaches of the shapes and placement of the radial stubs were made during the study. Substrate material...
Thermal management for modern electronic systems can follow two fundamental paths: one concentrates design efforts towards low power/high efficiency electronic circuits/components, the other implies, where the previous one reaches its limits, optimizing thermal transfer in the entire system at chip level, package level, and PCB/assembly level. Thus, exploring all methods of improving heat transfer...
This scientific paper reveals an intelligent system for data acquisition for dam monitoring and diagnose. This system is built around the RS485 communication standard and uses its own communication protocol [2]. The aim of the system is to monitor all signal levels inside the communication bus, respectively to detect the out of action data loggers. The diagnose test extracts the following functional...
This paper is related to PSpice modelling of resistive transducers used in dam's management. In the hydro-energetic buildings, but especially in dam's monitoring, the resistive transducers used for building management have a complex structure. These transducers have one or two physical parameters that affect their behavior. First of all, the temperature is the most common parameter, but, for example,...
This paper presents a data acquisition system used for AC/DC current monitoring. The developed system use the current transducer manufactured by LEM [3]. The output signal of the transducer is a voltage that is proportional to the current magnitude. To compute the current, the outputs signal is sampled with high frequency. The AC rms (root mean square) value is obtained by processing the sample values...
In the dams monitoring procedure there are several important aspects that must be taken into consideration when the specialists must give a detail report regarding the construction behavior during the operation. One of the above physical phenomena that must be followed is the inclination of the concrete blocks during the freezing / unfreezing intervals or maximal / minimal loads (from the lake's water...
This paper is focused on measurement of the resistive transducers used in dam's monitoring process. The hydro-energetic buildings, like dams are equipped with a large type of resistive transducer. Some of the sensors are placed inside during the dam construction, but, sensors are also mounted later on. The dams are monitored with a large type of resistive transducers. The first generations contain...
One of the biggest design challenges today is to properly design, manufacture, simulate and validate a Power Distribution Network (PDN) in systems with increasing speed, power dissipation and density. PDN are typically comprised of capacitors networks that have several types of capacitors and values to obtain target impedance over the required frequency range for the power/ground planes on PCBs. Capacitors...
Level measurement is the most important process which has to be followed in the dam's sensorial management department. Thus, the evaluation of the water seepage through the dam walls is becoming a first order parameter to be followed for the dam security monitoring. The level is measured before the weir boxes - where the water is collected via the existing drillings, into the special built gutters...
The proposed system wants to efficiently substitute the existing level sensors mounted in the dam wells based by its low cost and better precision. The system is been designed around a special designed capacitive sensor composed of eight independent copper pour areas distributed in mirror on from each other. The unknown variables of the resulted mathematical equations are the capacitances and the...
Power planes consisting of two parallel conducting planes: power and ground, are widely used on high-speed printed circuit boards. In was presented an efficient numerical approach based on the 2D FDM (finite difference method) to model the power/ground planes on a PCB in frequency domain and how to choose decoupling capacitors for a PDS (Power Delivery System) using a dedicate software. The goal of...
The Intermediate Data Format (IDF) is a specification designed to provide a neutral representation for exchanging printed circuit assembly (PCA) data among mechanical design (MCAD), PCA layout (ECAD), and physical design analysis (MCAE) applications. Powerful analysis software, like Ansys, Maxwell, Semcad, Altium Designer or SolidWorks - CircuitWorks, can import the idf files and use the model for...
Modern design of embedded systems is based on a microcontroller who's running a real time operating system. The big numbers of tasks that must be performed without affecting the system performances imply a lot of software analysis. A critical part in embedded system software is the part related to control algorithms: it is important to have a correct command in a critical amount of time. The simple...
Bergeron diagram method is a method to evaluate the effects of reflections on signal integrity. This graphic method is based on the real line's characteristics and it's valid for both linear and non-linear input/output characteristics of the driver/receiver. The value of the line characteristic impedance Z0 is considered always the same at every reflection because the Bergeron method is used only...
Physical parameters measures in activity of building management have slow variations. Some of parameters measures are temperature, pressure, movement of some building element. Taking in consideration this hypothesis the measurement system rate acquisition is low. The central unit can be a low speed programmable integrated circuit (IC) like a microcontroller. The low cost and low power consumption...
Available numerical methods for the characterization of microstrip lines involve extensive computations. The question that rises is which method should be used for a particular case. We propose to evaluate the results given by these formulas. The geometrical parameters of the microstrip structure are chosen in the commonly used range for PCBs. The purpose is to find out if well worth the effort to...
This paper makes a thermal study of a portable temperature measurement device under the influence of environment temperature. The portable device is used to measure sensors placed inside and outside of a hydro-energetic building (dams), where the ambient temperature range is between - 20degCdivide35degC. The self-heating phenomenon of electronics components cumulated with the ambient temperature increases...
Nowadays design of embedded systems for controlling processes requires high complexity software modules. In this way, the automatic code generation approach for designing such embedded systems seems to be the most competitive solution in terms of cost-effectiveness and performance. The solution holds some of the advantages: most of the software tooling required for designing an embedded controller...
This article wants to reveal a new method to measure and moderate a vibrating wire transducer. Combining a complex measuring procedure that includes data acquisition and a MatLab application, it is possible to calculate the transducer's impedance. Furthermore, using higher frequencies (as the resonance frequency), respectively lower frequencies signals, the technique above evaluates correctly some...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.