FDRE TVTI ETD
FDRE TVTI institutional repository is a new digital institutional repository system that collects, preserve and distribute the scholarly output of the Institute, mainly postgraduate Electronic Thesis and Dissertation (ETD), articles, proceedings. The system is dedicated to help users to find all the information they might require in order to format and successfully submit their graduate thesis, dissertation and publications electronically. The user friendly web interface enables to maximize and optimize the resource sharing among FDRE TVTI different faculties
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Recent Submissions
Assessment of Artificial Insemination Service among Small and Medium Scale Farmers in Addis Ababa, Ethiopia
(2024) Fentaye Anmaw
The objective of the study was to assess artificial insemination services across the two scales of
dairy operations, namely small- and medium-scale farms, in the three selected sub-cities of Addis
Ababa, Ethiopia. The three sub-cities (Akaki Kality, Bole, and Yeka) were selected purposefully
based on their high numbers of dairy cattle and milk potential, and six representative districts
were selected (two districts per sub-city) based on the above-mentioned criteria. A total of 182
dairy farms (75 small and 107 medium-scale) were recruited and interviewed face-to-face using a
semi-structured questionnaire. To explore further information, six focus group discussions and six
key informant interviews were conducted. A total of 48 frozen semen samples were collected from
the center and AI technicians to evaluate the quality of the semen. The data was analyzed using
SPSS, version 20 software.
Improving the voltage sag and voltage swell of power distribution with the integration of ultra-capacitor and dynamic voltage restorer using RBF network
(2022) Mahider Maseresha
Power Quality (PQ) problem is an occurrence manifested as a nonstandard voltage, current or
frequency that results in a failure of end use equipment’s. The voltage sag and swell are the
most frequent PQ problems that mainly occur in the distribution systems that causes for
frequent tripping of circuit breaker, failure of drive systems, shutdown for domestic and
industrial equipment. The Dynamic Voltage Restorer (DVR) connected in series has
magnificent dynamic capabilities and is a flexible solution for PQ problems. Ultra Capacitors/UCAP has ideal characteristics such as high power and low energy density essential
for improving the voltage sag and swell. In this thesis, voltage sag and voltage swell problem
are improved by using the method of integration of Ultra Capacitor and Dynamic Voltage
Restorer device and Radial Basis Function network.
Design Of Active Control System Using Aco Based Pid Controller For Civil Structure Under Seismic Excitation
(2023) Getachew Lerebo
The point of this research work is to develop structural control under seismic excitation. The
background of this control mechanism is discussed in introduction part. In the second part, the
reviews of literatures are discussed with their limitation and the third part includes the modeling
of the civil building (2floor) structure to control, active control system with feedback
mechanism has been developed. This feedback mechanism, PID controller with active mass
damper is discussed with their designed specification and modeling. Active mass damper
system and PID controller were designed for mitigating vibrations along the civil structure due
to wind and earthquake. ACO and PSO algorithm are developed for tuning PID parameters.
ACO based PID control mechanism has better performance and fast response. The sensor with
dual properties has developed for vibration motion of the structure, this sensor is called
piezoelectric sensor. Which can work with inverse operation and direct operation, in this thesis
work direct operation or sensor operation was considered to sense vibration of the structure
under earthquake. And 0.085ac voltage was produced. In spite of the ac output produced by
piezoelectric element, rectifier is placed at the output side of the piezo element to convert ac to
dc. And produced Dc voltage is low; boost converter is applied to step up this voltage and
produces 11.18 Vdc. Dc motor as actuator was designed and produced mechanical force to
apply in to active mass damper which is modelled in side of the civil structure. Actuator force
produced is 1.9 ∗ 10−3N and disturbance force is −2.7 ∗ 10−5N.
Design Of Active Control System Using Aco Based Pid Controller For Civil Structure Under Seismic Excitation.
(2023) Getachew Lerebo
The point of this research work is to develop structural control under seismic excitation. The
background of this control mechanism is discussed in introduction part. In the second part, the
reviews of literatures are discussed with their limitation and the third part includes the modeling
of the civil building (2floor) structure to control, active control system with feedback
mechanism has been developed. This feedback mechanism, PID controller with active mass
damper is discussed with their designed specification and modeling. Active mass damper
system and PID controller were designed for mitigating vibrations along the civil structure due
to wind and earthquake. ACO and PSO algorithm are developed for tuning PID parameters.
ACO based PID control mechanism has better performance and fast response. The sensor with
dual properties has developed for vibration motion of the structure, this sensor is called
piezoelectric sensor. Which can work with inverse operation and direct operation, in this thesis
work direct operation or sensor operation was considered to sense vibration of the structure
under earthquake. And 0.085ac voltage was produced. In spite of the ac output produced by
piezoelectric element, rectifier is placed at the output side of the piezo element to convert ac to
dc. And produced Dc voltage is low; boost converter is applied to step up this voltage and
produces 11.18 Vdc. Dc motor as actuator was designed and produced mechanical force to
apply in to active mass damper which is modelled in side of the civil structure. Actuator force
produced is 1.9 ∗ 10−3N and disturbance force is −2.7 ∗ 10−5N