Cooperation and Contribution of Riga Technical University Faculty of - - PowerPoint PPT Presentation
Cooperation and Contribution of Riga Technical University Faculty of Power and Electrical Engineering Institute of Industrial Electronics and Electrical Engineering for COST IC0603 Antenna Systems & Sensors for Information Society
8 faculties:
Architecture and urban planning Building and civil engineering Materials science and applied chemistry Transport and mechanical engineering Electrical and power engineering Computer science and information technology Electronics and telecommunications Engineering economics
34 institutes, 1 independent institute, 44 departments, 48 divisions, 27 laboratories, 19 centres
(18 000 students)
8 246 9 035 7 242 9 271 7 952 9 848 7 222 9 278 8 154 9 700
337 377 393 442 235
19 40 34 25 17
* prognosis
520 000 685 000
1 265 000
1 581 000 625 000
2 206 000
1 921 000 524 000
2 445 000
3 389 680 1 025 784
4 415 464
4 522 564 1 200 000
5 722 564
Contracts and MOP Science funding LVL
STRP: COCOMAT CASEEM SCOUT EPE4PEMC PERCERAMICS AISHA CA: SANDCORE IST4Balt eLOGMAR4M OTHER: KALEIDOSCOPE START CHITOSANPEROS MOMENTUM NANOCERAM EURNEX COST 365 ENCOMAR4AAC
IP:
EU4DEEP FRIENDCOPTER interSHIP ALCAS TECHNEAU NoE: KALEIDOSCOPE NANOCERAM EURNEX
Faculty of Electrical and Power Engineering
Faculty of Electronics and Telecommunications
2 sets of FUEL CELL equipment, 2 kW (BALLARD) DC/DC converters DC/AC inverters Accessories Advanced measurement technique
Department of transport electronics and telematics
Contact: Assoc. Prof. Ansis Klūga E-mail: Ansis.Kluga@rtu.lv
‘Micro’ class UAV is with takeoff weight up to 5 kilograms. It is equipped with an electrical engine, which makes it practically noiseless. It is controlled remotely by onboard radio control apparatuses and a GPS receiver. UAV purpose: UAV purpose:
photographic work and video filming on terrain; patrolling on desired track;
aerial spotting operations; ecological and meteorological environment monitoring.
Basic technical information: Basic technical information:
useful load – up to 1,5 kg; flight duration – up to 30 minutes; cruising speed – up to 65 km/h. 2. MULTICOMPONENT INTERMETAL-CERAMIC NANOCOATINGS FOR HOT SECTION PARTS OF GAS TURBINE ENGINES 3. IONIC-PLASMA COVERINGS FOR PROTECTION AND RESTORATION OF DETAILS FOR VEHICLE POWER-PLANTS 1. 1. UNMANNED AERIAL VEHICLE UNMANNED AERIAL VEHICLE ( (UAV UAV) ) Contact: Prof. Aleksandrs Urbahs E-mail: Aleksandrs.Urbahs@rtu.lv
Material consumption depending on the span of the structure
MOBILE LIGHTWEIGHT HIERARCHIC CABLE STRUCTURE MOBILE LIGHTWEIGHT HIERARCHIC CABLE STRUCTURE
large span span
no intermediate intermediate posts posts
small dead dead weight weight
mobility
easy expandable expandable
increased safety safety
low material material consumption consumption
hybrid composite composite cable cable
two failure failure stages stages
possible translucency translucency
Hierarchic Cable Structures
Contact: Prof. Kārlis Rocēns E-mail: bri@bf.rtu.lv
HYBRID COMPOSITE CABLE WITH TWO STAGE MODE OF FAILURE HYBRID COMPOSITE CABLE WITH TWO STAGE MODE OF FAILURE Cross section Working Scheme Axial force vs. strain relationship
Contact: Prof. Kārlis Rocēns E-mail: bri@bf.rtu.lv
RTU research development project
“Elaboration of the bidirectional power flow controller for traction substations”
Institute of Industrial Electronics and Electrical Engeneering
Applications Foreign patents Trade marks
at day time;
centre and department of distance education give an
in different sciences and obtain a certificate after graduation.
On the 11th of June, 2006 our Institute has been registered in the register of scientific institutions under number 321092 that allows us to participate in international and local research projects in the field of electronics and electrical engineering. In the report are described a main branches of research, contact information of the staff, scientific results and present scientific infrastructure. Special attention is devoted to the Doctoral students who will as basic workforce provide development of science in future. Today IEEI realizes more than 40 scientific and academic projects with the support of European funds providing investigation of new modern technologies and application of this knowledge in the educational process.
Laboratory of electromechatronics head of laboratory academic Leonids Ribickis
Computer control of industrial engineering
The are many research was done since 2002 in laboratory, which are related with industrial system computer control branch
Each year Institute at Industrial Electronics and Electrical Engineering renovation research equipment, using ERAF (European Regional Development Fund), ESF (European Social Fund) and Latvia state financing Last 3 years we have renovated computer laboratory, bought few working sends for testing of electrical drives Bought 3 ROBOTINO robots for students attracting Bought fuel cell for scientific researches We are bought , but not installed yet FESTO
Existing equipmen
European Youngh Radio Electronic Energy Saving Project at the Riga Youngh Technical centre Robotika 2007
Ostvalda secondary school, Riga,2007
Riga state gymnasium Nr. 1, Riga,2007
Stations in the RTU tender specs
4 15 7 8 9 10 11 1 2 3 14 13 5 6 12
4 15 7 8 9 10 11 1 2 3 14 13 5 6 12
–High level –Low level
–(more than 50% of the whole schedule is necessary);
A/S „Latvenergo”, A/S „Latvenergo Augstsprieguma Tīkls”, A/S „Latvenergo Sadales Tīkls”, a/s Latvenergo, filiāles Daugavas HES, ražotne „Ėeguma HES” elektrotehniskā laboratorija, A/S „Latvijas dzelzceĜš”, SIA „ABB Latvija”, SIA „Siemens”, SIA “Lāsma”, SIA “EK Sistēmas”, SIA “Beijer electronics”, SIA “BST”, SIA “IDS”, SIA “Amerilat4md”, A/S “CeĜu projekts”, SIA “EMT”, SIA “OMS”, SIA „Envirotech”, SIA „Latvijas Energoceltnieks”, SIA „Klinkmann”, SIA „SLO Latvija”, SIA „Thomeko”, SIA „Rīgas Gaisma”, A/S „Latvo”, SIA „Baltic Scientific Instruments”, SIA „VSF”, A/S „Rebir”, SIA „Profs”.
Chaiko LZP Antenna application for industrial systems and transport intelligent systems
Telekomunikāciju tīklu pamatjēdziens Sakaru tīklu uzbūves un ekspluotācijas īpatnības elektrotehnikā Vadu un bezvadu tīklu pamata elementi OSI modelis Interfeisa iekārtas un komunikācijas protokoli Intelektuālo tīklu uzbūve Zināšanu atspoguĜošana Tipisko autmātikas elementu sasaiste vadības shēmā Intelektuālo tīklu modeĜu analīze Ražošanas procesu datorvadība
Experiance in MATHEMATICAL MODELS OF RADIO WAVE PROPAGATION IN WOODLAND FOR MOBILE COMMUNICATION SYSTEMS Yelena CHAIKO
propagation in forest is an actual problem.
The purpose of this work consists in carrying out complex researches of radiowaves propagation for a decimeter range in large forests for base development when designing cellular systems for mobile communication in Europe; construction of the mathematical models determining parameters of the forest environment; the description of the basic mechanisms of radiowaves propagation for decimeter range in conditions of forest depending on distance between a point of reception and base station, in view of real parameters of large forests: dielectric permeability of trees, the sizes, density, humidity, wind loadings and so forth.
The comparative analysis theoretical and experimental researches of propagation UHF of electromagnetic waves in large forests. For an estimation of adequacy of the received theoretical and experimental results on propagation UHF of electromagnetic waves to large forests it is necessary to lead their comparative analysis and as to use the experimental results received by other authors.
On diagram.1 numerical values median the normalized levels of capacity of radio signals P (d) in locations MS as functions from distance between MS and BTS - d for working frequency of 900 MHz provided that electromagnetic waves emitted- are vertically polarized by antenna BTS are submitted.
Theoretical models
2 4 6 8
Distance between MS and BTS d(km) A level of a signal in a point of reception MS P(d) (dBm)
(1) The one- beam model (2) The two- beam model (4) The model for the mixed path (3) The model
diagram 1. Dependences of changes of numerical values of the normalized levels of an accepted signal on average frequency
a) The one-beam model submitted by a curve (1), gives the following numerical values of function P (d):
6
5
4
3
2
1
0.5 A level of a signal in a point of reception MS P (d) (dBm) Distance between MS and BTS d (km) The one-beam model
1 2 3 4 5 6 7
Distance between MS and BTS d (km)
A level of a signal in a point of reception MS P(d) (dBm)
(1) The one- beam model
The two-beam model submitted by a curve (2), gives the following numerical values of function P (d):
6
5
4
3
2
1
0.5 A level of a signal in a point of reception MS P (d) (dBm) Distance between MS and BTS d (km) The two-beam model
1 2 3 4 5 6 7 Distance between MS and BTS d (km) A level of a signal in a point of reception MS P(d) (dBm) (2)The tw o-beam model
At falling radiowaves on a large forest when the marge of a forest is located on distance from base send-receive station on 1 km, values of a level of capacity in a point of reception pay off under the formula:
Tree Tree Tree
2 km Tree Tree Tree
P(d) = P0 (d) + (-α⋅d),
Where P0 (d) - a level of capacity, defined for one-beam model dBm in a point d0=1km α - effective value of running factor of attenuation of the corresponding determined model forests - or α = 0.162 dB/km (for layered structure), or α = 0.34 dB/rm - for a large forest in which trees as spheres are located by correct image in space, d - a difference of distances between position of a point of reception and position of a marge of a forest (d0=1km), km. For these cases of dependence of functions P0(d), P1(d) and P2(d) are submitted on diagram 12 as curves 0,1 and 2, and numerical values of function P (d) in the table:
6
5
4
3
2
1 P2(d) Sphere trees P1(d) Layered forest A level of a signal in a point of reception MS P (d) (dBm) Distance betwee n MS and BTS d (km)
5 10 Distance between MS and BTS d(km) A level of a signal in a point of reception MS P (d) (dBm) (1) The one- beam model (2)Layered forest (3)Sphere trees
The determined model for the mixed line, submitted the curve 3 diagram. 13, gives the following numerical values of function P (d):
6
5
4
3
2
1
0.5 A level of a signal in a point of reception MS P (d) (dBm) Distance between MS and BTS d (km) MS
The model for the mixed path
1 2 3 4 5 6 7 Distance between MS and BTS d(km) A level of a signal in a point
(3) Mixed path
The model of diffraction on a wedge, submitted the curve 4 diagram 14., gives the following numerical values to function P (d):
6
5
4
3
2
1
0.5 A level of a signal in a point of reception MS P(d) (dBm) Distance between MS and BTS d (km)
The model of diffraction on a wedge
1 2 3 4 5 6 7 Distance between MS and BTS d(km) A level of a signal in a point of reception MS P(d) (dBm) (4)Diffraction on a w edge
Thus, from comparison of functions P (d) for theoretical models it is visible, that:
dmax< 4h1h2/[λ (2π-φ)] in comparison with one-beam model fluctuations of a level of a signal are observed, and with increase in distance d falling of values of function P (d) submits Vvedensky to law (shift downwards on a level of capacity makes about - 9dBm.); For the determined models forests (i.e. for layered and spherical structures) arises falling a radio signal, since a marge of a forest at its propagation inside of a forest, thus shift downwards on a level of capacity makes - for layered - 0,680 dBm. for spherical - 0,324 dBm.); For a case of diffraction on a wedge when a radiowave difracts on edges of trees on a marge of a forest, the level of a radio signal in comparison with free propagation falls approximately on 20 dBm. (i.e. on wide highway located between large forests the level of a radio signal will be lower on 20 dBm in comparison with free space);
etc., i.e. there is a heterogeneous (non-uniform) attenuation of a radio signal on a line and it should be reflected at calculation by use
part of a line model of diffraction on a wedge, etc. On fig. the line of measurement which becomes attached to discrets d, km = 0.5., 1.0., 2.0., 3, 4, 5,6 is schematically displayed.
0 m 1000 m 2000 m 3000 m 4000 m 5000 m 100 m
At calculation it was supposed, that or the radiowave is distributed in a zone of direct visibility, or in a point of reception there comes the sum of the reflected and direct wave, or the radiowave is distributed inside a forest, or difracts on a wedge, or the radiowave is distributed in the mixed line. In table are submitted values levels of capacity experimentally measured in various points of reception with change of distance from MS up to BTS (d = 0.5., 1.0., 2.0., 3, 4, 5,6) km.
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4
3
2
1
0.5 Levels of a radio signal in a point of reception MS P (d) (dBm), received on a basis Experiment Distance between MS and BTS d (km)
Apparently from diagram experimental points get in a field of curves received theoretically and in various points can or coincide with the points received at calculations on the basis of various theoretical models of radiowaves propagation, or strongly differ.
Theory and experiment
1 2 3 4 5 6 7
Distance between MS and BTS d(km) A level of a signal in a point of reception MS P(d) (dBm)
(1)The one-beam model (2)The tw o-beam model (3)The mixed path (4)Diffraction on a w edge (5)Experiment (6)Layered forest (7)Shrere trees
the basis of one6beam model (657,246 dBm), that apparently, speaks that the resulting field in a point of reception grows out interferences of two or several radiowaves.
distributed inside a large forest and the level of a radio signal made (675 dBm), i.e. was lower than for free propagation
spherical (663.606 dBm) structures) for the given distance that testifies to sharper attenuation of radiowaves in a forest at through propagation. At the further deepening of the transmitter in a forest the level of a signal decreased according to weaking of a wave in free space.
model 6 69,287 dBm, for determined models668,639 dBm (spherical structure)667,927 dBm (layered structure), for the mixed line672,702 dBm i.e. experimental values got in area limited to a curve for one6beam model and the mixed line.
make for experiment 6 64дБм, for one6beam model 6 71 dBm, for determined models669,525 dBm (layered structure) and670,415 dBm (spherical structure).
degree of attenuation is high, with increase in depth of penetration the degree goes down.
systems has shown, that radiowaves propagation in conditions of a forest, is accompanied by effects of repeated reflection, diffraction, dispersion of waves that results in formation of complex spatial propagation of an electromagnetic field, thus values effective median levels get in a field of values received on the basis of theoretical models.
from range between a radiator and place of acceptance is defined by theoretical expression correctly.
frequencies of 900 MHz close to average frequency (800 4 1200 MHz)
and humidity of forest and a kind of the line, the received values of weaking of a signal differ from each other.
determined models and for an estimation of integrated influence forest areas on levels of a signal in points of an arrangement of mobile stations when they move inside a forest.
waves dispersion it is shown, that for the description of an average field and intensity of a direct wave the model as a homogeneous layer with effective electric parameters is applicable. These parameters are defined by density, the average sizes, values of complex dielectric permeability of trees, and also frequency of radiation. The direct wave gives the basic contribution to intensity of an accepted signal.
frequency, parameters of a large forest. Besides the received results can be applied at the decision of the inverse problems necessary for research of forests by radiophysical methods.
FOUNDER OF PHYSICAL CHEMISTRY PROFESSOR OF RIGA TECHNICAL UNIVERSITY (1881 – 1887)