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Ice accretion poses substantial safety hazards for the manned and unmanned aviation industries. Its study is essential for icing events risk assessment and for the development of efficient ice protection systems. The existing ice accretion measurement techniques—casting, molding, and laser-scanning—are time-consuming, sometimes cumbersome to use, and highly expensive, while hand tracing is inexpensive, but has lower accuracy and time-consuming post-processing. This work presents two low-cost, fast, and easy-to-use measurement techniques for 2D ice accretion profiles. Both employ algorithms of automatic ice shape detection, one based on unmediated image-processing, another based on the processing of manual ice tracings. The techniques are applied to ice accretion experiments conducted in an icing wind tunnel at low Reynolds numbers, and their results are validated against ice thickness caliper measurements. A comparison of the results shows that both techniques accurately measure the leading-edge ice thickness and the 2D shape of the ice accretion profiles. One technique is faster, with higher measurement accuracy, but produces interrupted-line 2D ice profiles and requires good lighting conditions, while the other generates continuous-line 2D profiles and has no application restriction, but it is slower, with lower accuracy. A discussion is conducted, aiming to help one determine the best applications for each ice accretion measurement technique presented., SCOPUS: ar.j, info:eu-repo/semantics/published

The reliability and efficiency of power grids directly contribute to the economic well-being and quality of life of citizens in any country. This reliability depends, among other things, on the power lines that are exposed to different kinds of factors such as lightning, pollution, ice storm, wind, etc. In particular, ice and snow are serious threats in various areas of the world. Under certain conditions, outdoor equipment and hardware may experience various problems: cracking, fatigue, wear, flashover, etc. In actual fact, a variety of countermeasures has been proposed over the past decades and a certain number have been applied by utilities in various countries. This contribution presents the status and current trends of different techniques against atmospheric icing of power lines. A snapshot look at some significant development on this topic over the last four decades is addressed. Engineering problems in utilizing these techniques, their applications, and perspectives are also foreseen. The latest up-to-date review papers on the applications and challenges in terms of PhD thesis, journal articles, conference proceedings, technical reports, and web materials are reported.

Atmospheric in-flight icing on unmanned aerial vehicles (UAVs) is a significant hazard. UAVs that are not equipped with ice protection systems are usually limited to operations within visual line of sight or to weather conditions without icing risk. As many military and commercial UAV missions require flights beyond visual line of sight and into adverse weather conditions, en-ergy-efficient ice protection systems are required. In this experimental study, two electro-thermal ice protection systems for fixed-wing UAVs were tested. One system was operated in anti-icing and de-icing mode, and the other system was designed as a parting strip de-icing system. Experiments were conducted in an icing wind tunnel facility for varying icing conditions at low Reynolds num-bers. A parametric study over the ice shedding time was used to identify the most energy-efficient operation mode. The results showed that longer intercycle durations led to higher efficiencies and that de-icing with a parting strip was superior compared to anti-icing and de-icing without a parting strip. These findings are relevant for the development of energy-efficient systems in the future., SCOPUS: ar.j, info:eu-repo/semantics/published

Icing conditions including atmospheric liquid water content (LWC) and size distribution of droplets were recorded close to the top of Mt. Åreskutan, 1260-m above sea level, Sweden, a place known for frequent severe icing. The findings are comparatively analyzed. Combitech IceMonitor was used to measure the ice load, and HoloOptics T41 was used to measure the atmospheric icing rate. A method to translate the digital output from HoloOptics T41 to a value between 0 and 100 is described and used. Two instruments were used for measuring LWC and the median volume diameter (MVD). We created a model of icing intensity based on the k-nearest neighbor (KNN) using wind speed, LWC, and MVD as input. The result indicates that more learning data decrease the error. An heuristic model of erosion/ablation was added to simulate the ice load, and the result was compared with that of the standard Makkonen ice load model. The Makkonen model is suitable for estimating the ice load using a 1-h temporal resolution. With a 1-min temporal resolution, the erosion/ablation needs to be modeled and included. Our observations show that conditions can alternate between icing and erosion/ablation within 1 min during an icing event., Funding details: European Regional Development Fund, FEDER; Funding details: Energimyndigheten, 37268-1; Funding text 1: Manuscript received July 30, 2019; revised December 30, 2019; accepted December 31, 2019. Date of publication January 15, 2020; date of current version June 24, 2020. This work was supported in part by Swedish Energy Agency under Project 37268-1 and in part by the European Union Regional Development Fund through the SMART Project. The Associate Editor coordinating the review process was Huang-Chen Lee. (Corresponding author: Stefani Rydblom.) Stefani Rydblom is with the RISE Research Institute of Sweden, 852 30 Sundsvall, Sweden (e-mail: stefani.rydblom@ri.se).

Icing conditions including atmospheric liquid water content (LWC) and size distribution of droplets were recorded close to the top of Mt. Åreskutan, 1260-m above sea level, Sweden, a place known for frequent severe icing. The findings are comparatively analyzed. Combitech IceMonitor was used to measure the ice load, and HoloOptics T41 was used to measure the atmospheric icing rate. A method to translate the digital output from HoloOptics T41 to a value between 0 and 100 is described and used. Two instruments were used for measuring LWC and the median volume diameter (MVD). We created a model of icing intensity based on the k-nearest neighbor (KNN) using wind speed, LWC, and MVD as input. The result indicates that more learning data decrease the error. An heuristic model of erosion/ablation was added to simulate the ice load, and the result was compared with that of the standard Makkonen ice load model. The Makkonen model is suitable for estimating the ice load using a 1-h temporal resolution. With a 1-min temporal resolution, the erosion/ablation needs to be modeled and included. Our observations show that conditions can alternate between icing and erosion/ablation within 1 min during an icing event., Funding details: European Regional Development Fund, FEDER; Funding details: Energimyndigheten, 37268-1; Funding text 1: Manuscript received July 30, 2019; revised December 30, 2019; accepted December 31, 2019. Date of publication January 15, 2020; date of current version June 24, 2020. This work was supported in part by Swedish Energy Agency under Project 37268-1 and in part by the European Union Regional Development Fund through the SMART Project. The Associate Editor coordinating the review process was Huang-Chen Lee. (Corresponding author: Stefani Rydblom.) Stefani Rydblom is with the RISE Research Institute of Sweden, 852 30 Sundsvall, Sweden (e-mail: stefani.rydblom@ri.se).

Harsh winter climate causes various problems for both the public andprivate sector in Sweden, especially in the northern part and the railway industryis no exception. This master thesis project covers an investigation of the eects ofthe winter climate and a phenomena called atmospheric icing on the performance ofthe train in a region called the Botnia-Atlantica region. The investigation was donewith data over a short period January-February 2017 with simulated weather datafrom the Weather research and forecast model that was compared with the periodOctober - December 2016. The investigation only included high speed trains.The trains have been analysed based on two dierent performance measurements.The cumulative delay which is the increment in delay over a section and the currentdelay which is the current delay compared to the schedule. Cumulative delaysare investigated with survival analysis and the current delay is investigated with aMulti-state Markov model.The results show that the weather could have an eect on the trains performancewhere the survival analysis detected connection between the weather and cumulativedelays. The Markov model also showed a connection between the weather anddelayed trains including that the presence of atmospheric icing had a negative eecton remaining in a state of non-delay.

Fabrics treated to repel water, superhydrophobic, and water and oil, superamphiphobic, have numerous industrial and consumer-level benefits. However, the liquid repellency decreases in the course of time. This is largely due to chemical or physical changes of the coating due to prolonged exposure to relatively harsh environments. To develop more durable fabric treatments for specific applications, it is necessary to measure the extent to which the treated fabrics retain their low-wettability after being subjected to controlled aggressive environmental conditions. In this study, plain weave fabrics made from polyester filaments and coated with silicone nanofilaments in-solution were exposed to aerodynamic icing conditions. The coated fabrics showed superhydrophobic behavior, or superamphiphobic for those that were fluorinated. The wettability of the fabrics was progressively evaluated by contact angle and roll-off-angle measurements. The coated fabrics were able to maintain their low-wettability characteristics after exposure to water droplet clouds at airspeeds up to 120 m/s, despite damage to the silicone nanofilaments, visible through scanning electron microscopy., Circular Product Design, Novel Aerospace Materials

Fabrics treated to repel water, superhydrophobic, and water and oil, superamphiphobic, have numerous industrial and consumer-level benefits. However, the liquid repellency decreases in the course of time. This is largely due to chemical or physical changes of the coating due to prolonged exposure to relatively harsh environments. To develop more durable fabric treatments for specific applications, it is necessary to measure the extent to which the treated fabrics retain their low-wettability after being subjected to controlled aggressive environmental conditions. In this study, plain weave fabrics made from polyester filaments and coated with silicone nanofilaments in-solution were exposed to aerodynamic icing conditions. The coated fabrics showed superhydrophobic behavior, or superamphiphobic for those that were fluorinated. The wettability of the fabrics was progressively evaluated by contact angle and roll-off-angle measurements. The coated fabrics were able to maintain their low-wettability characteristics after exposure to water droplet clouds at airspeeds up to 120 m/s, despite damage to the silicone nanofilaments, visible through scanning electron microscopy., Circular Product Design, Novel Aerospace Materials

Harsh winter climate causes various problems for both the public andprivate sector in Sweden, especially in the northern part and the railway industryis no exception. This master thesis project covers an investigation of the eects ofthe winter climate and a phenomena called atmospheric icing on the performance ofthe train in a region called the Botnia-Atlantica region. The investigation was donewith data over a short period January-February 2017 with simulated weather datafrom the Weather research and forecast model that was compared with the periodOctober - December 2016. The investigation only included high speed trains.The trains have been analysed based on two dierent performance measurements.The cumulative delay which is the increment in delay over a section and the currentdelay which is the current delay compared to the schedule. Cumulative delaysare investigated with survival analysis and the current delay is investigated with aMulti-state Markov model.The results show that the weather could have an eect on the trains performancewhere the survival analysis detected connection between the weather and cumulativedelays. The Markov model also showed a connection between the weather anddelayed trains including that the presence of atmospheric icing had a negative eecton remaining in a state of non-delay.

During the past few decades, plasma-based surface treatment methods have gained a lot of interest in various applications such as thin film deposition, surface etching, surface activation and/or cleaning, etc. Generally, in plasma-based surface treatment methods, high-energy plasma-generated species are utilized to modify the surface structure or the chemical composition of a substrate. Unique physical and chemical characteristics of the plasma along with the high controllability of the process makes plasma treatment approaches very attractive in several industries. Plasma-based treatment methods are currently being used or investigated for a number of practical applications, such as adhesion promotion in auto industry, wound management and cancer treatment in biomedical industry, and coating development in aerospace industry. In this study, a two-step procedure is proposed for the development of superhydrophobic/icephobic coatings based on atmospheric-pressure plasma treatment of aluminum substrates using air and nitrogen plasma. The effects of plasma parameters on various surface properties are studied in order to identify the optimum conditions for maximum coating efficiency against icing and wetting. In the first step, the interactions between air or nitrogen plasma and the aluminum surface are studied. It is shown that by reducing jet-to-substrate distance, air plasma treatment, unlike nitrogen plasma treatment, is capable of creating micro-porous micro-roughened structures on the surface, some of which bear a significant resemblance to the features observed in laser ablation of metals with short and ultra-short laser pulses. The formation of such structures in plasma treatment is attributed to a transportation of energy from the jet to the surface over a very short period of time, in the range of picoseconds to microseconds. This energy transfer is shown to occur through a streamer discharge from the rotating arc source in the jet body to a close proximity of

In this case study several periods of measured active icing events have been compared with calculated activeicing. Icing events from three winter seasons in Sweden have been selected as a base for studying how well acommonly used method to calculate icing can capture icing events, aswell as to try out a newapproach. Anotherpurpose is to enlighten parties interested in atmospheric icing of the challenges of calculating icing. For thosewith little knowledge of Numerical Weather Prediction (NWP) models it can be hard to understand why thereare differences between two models, or even the same model using different physical parameterisation schemes.In this study data fromtwoNWP models have been used to calculate icing, aswell as being compared with a newapproach using meteorological measurements to calculate icing. Using meteorological measurements to calculateicing is an interesting alternative as it is computationally less expensive than using aNWP model to generatethe necessary data. All tested methods could at times capture the dynamics of the measured icing, though there are on occasion largedifferences between the different calculated icing and also between calculations and measurements. This highlightsthe importance of having an understanding of NWP models when studying atmospheric icing; there canbe a large spread between different models, and also when using the same model with different schemes. Theresults show that calculated icing is comparable to measured icing and that the methodologies investigatedare viable options for calculating atmospheric icing., Vindforsk III - wind power in cold climates - V313

Global warming is causing greater retreat of the summer Arctic sea ice cover; with several historical minimums within the last decade. Opening of the Chukchi Sea and the Beaufort Sea is expected to cause increased marine and other activity off of the northern Alaska coast and through the Bering Strait. This will require increased Coast Guard presence. Bow spray icing of Coast Guard Cutters decreases safety and risks mission accomplishment. This report reviews documented causes and potential impacts of ship superstructure icing from bow spray and atmospheric sources, and examines the probability of icing in the Chukchi and Beaufort Seas. Four classes of Coast Guard Cutters, the POLAR-Class heavy icebreakers, the LEGEND-Class National Security Cutter, the BAY-Class 140-ft icebreaking tug, and the JUNIPER-Class seagoing buoy tender were examined. Decks were walked, crews interviewed, and questionnaires distributed to determine the impact of icing on cutter components and functions, to learn how icing affects mission success, to determine how ice accumulations are currently prevented or removed, and to seek improved ways of alleviating icing effects. In addition, 12 classes of ice protection technology were reviewed, as were methods of protecting windows and cables from icing, to determine how they may reduce icing hazards. Recommendations for existing cutters are to heat decks, to test and use anti-icing and low ice adhesion coatings, to use low corrosion aircraft and environment safe chemicals and high velocity fluids to de-ice, to protect vessel components with covers, to use expulsive, pulse electrothermal, and pneumatic technologies on large untrafficked surfaces, and to use infrared heat to protect components and limited deck areas. New cutter designs should incorporate heated decks, splash-resistant bows, and covered masts and boat decks. Cutters need not be completely ice-free in transit and when executing a mission.

This paper reviews the main contributions of the CIGELE research team to the dynamics of streamer discharges along ice surfaces. These investigations were mainly performed under lightning impulse voltage, in atmospheric air. High-speed streak photography techniques were used to observe the streamers propagating between a rod-plane configuration half-submerged in ice bulk. The dynamics of streamer were investigated as influenced by the voltage characteristics, gap configuration, freezing water conductivity, and surrounding temperature. In addition to ice surface, corona discharge was also studied at insulator surface and at the air gaps between the electrodes in order to assess the role played by ice surface on discharge inception and propagation processes. The paper is not restricted to previously published work but contains a substantial amount of new material with a view to closing some major gaps in the present state of ice surface flashover knowledge.

This paper reviews the main contributions of the CIGELE research team to the dynamics of streamer discharges along ice surfaces. These investigations were mainly performed under lightning impulse voltage, in atmospheric air. High-speed streak photography techniques were used to observe the streamers propagating between a rod-plane configuration half-submerged in ice bulk. The dynamics of streamer were investigated as influenced by the voltage characteristics, gap configuration, freezing water conductivity, and surrounding temperature. In addition to ice surface, corona discharge was also studied at insulator surface and at the air gaps between the electrodes in order to assess the role played by ice surface on discharge inception and propagation processes. The paper is not restricted to previously published work but contains a substantial amount of new material with a view to closing some major gaps in the present state of ice surface flashover knowledge.

Wind power will play a major role in the future energy system in Sweden. Most of the major wind parks are planned to be built in sites where the cold climate and atmospheric icing can cause serious problems. This underlines the importance of addressing these issues. The major cause of these problems is in-cloud icing of the rotor blades due to super cooled liquid droplets of clouds. The droplets freeze upon impact with the rotor blade and form hard rime ice. This rime ice causes disruption in the aerodynamics that leads to production losses, extra loads on the rotor blades and when the ice is shed it poses a safety risk to people in the near environment. This master thesis focuses on how to measure the accretion of ice and the correlation between measured ice and production losses of two wind parks in northern Sweden. The results show a good correlation between the ice accretion on a stationary sensor and the production loss from a wind turbine. In most icing events the icing of the sensor and large production losses from the wind turbine correlated clearly. Attempts to quantify the production losses at a certain ice rate measured with the stationary sensors was done, however no clear results was produced. The reason for this is that the wind turbines often stop completely during an icing event and that the time series analyzed was too short to be able to quantify the losses at certain wind speed and ice rates. Recommendations on the type of sensor which should be used was to be produced, however the conclusion was that no single sensor has acted satisfactory and could be recommended to measure ice accretion for wind turbine applications. Due to this, at least two sensors are recommended to increase the redundancy in the measurement system. Modeling ice accretion with standard parameters measured has been done and the results show that the time of icing could be determined quite well when the sensors was ice free, however when the sensors and especially the humi

Wind power will play a major role in the future energy system in Sweden. Most of the major wind parks are planned to be built in sites where the cold climate and atmospheric icing can cause serious problems. This underlines the importance of addressing these issues. The major cause of these problems is in-cloud icing of the rotor blades due to super cooled liquid droplets of clouds. The droplets freeze upon impact with the rotor blade and form hard rime ice. This rime ice causes disruption in the aerodynamics that leads to production losses, extra loads on the rotor blades and when the ice is shed it poses a safety risk to people in the near environment. This master thesis focuses on how to measure the accretion of ice and the correlation between measured ice and production losses of two wind parks in northern Sweden. The results show a good correlation between the ice accretion on a stationary sensor and the production loss from a wind turbine. In most icing events the icing of the sensor and large production losses from the wind turbine correlated clearly. Attempts to quantify the production losses at a certain ice rate measured with the stationary sensors was done, however no clear results was produced. The reason for this is that the wind turbines often stop completely during an icing event and that the time series analyzed was too short to be able to quantify the losses at certain wind speed and ice rates. Recommendations on the type of sensor which should be used was to be produced, however the conclusion was that no single sensor has acted satisfactory and could be recommended to measure ice accretion for wind turbine applications. Due to this, at least two sensors are recommended to increase the redundancy in the measurement system. Modeling ice accretion with standard parameters measured has been done and the results show that the time of icing could be determined quite well when the sensors was ice free, however when the sensors and especially the humi

The design and validation of adequate aircraft ice protection has evolved into a specialized and technically complex area where many engineering disciplines are involved; namely, aeronautical, electrical, mechanical, electronics, chemical simulations, mathematical modeling, airframe/engine systems design, atmospheric physics, and meteorology. Research advances in any one discipline have a direct effect on updating the procedural technology used in the design and validation of ice protection configurations, equipment, and systems. Periodically the Federal Aviation Administration (FAA) provides documentation to assist regulatory certification teams and industry design engineers in standardizing testing and validating procedures. Examples of such documentation are 'Engineering Summary of Airframe Icing Technical Data,' FAA report No. ADS-4 dated December 1968, and 'Engineering Summary of Powerplant Icing Technical Data,' FAA Report No. RD-77-76 dated July 1977. Although most of the information contained in these reports is still valid, some is outdated, and more usable information is now available through recent research and experience. Therefore, this work was directed towards developing an updated and more comprehensive combined version of Report ADS-4 and RD-77-76 that includes reference material on ground and airborne icing facilities, simulation procedures, and analytical techniques. This document represents all types and classes of aircraft and is intended as a working tool for the designer and analyst of ice protection systems., See also Volume 3, AD-A238 041 and Rept. nos. FAA-ADS4 dated Dec 63, AD-608 865 and FAA-RD-77-76 dated Jul 77, AD-A045 087.

The design and validation of adequate aircraft ice protection has evolved into a specialized and technically complex area were many engineering disciplines are involved; namely, aeronautical, electrical, mechanical, electronics, chemical simulations, mathematical modeling, airframe/engine systems design, atmospheric physics, and meteorology. Research advances in any one discipline have a direct effect on updating the procedural technology used in the design and validation of ice protection configurations, equipment, and systems. Periodically the Federal Aviation Administration (FAA) provides documentation to assist regulatory certification teams and industry design engineers in standardizing testing and validating procedures. Examples of such documentation are Engineering Summary of Airframe Icing Technical Data, FAA report No. ADS-4 dated December 1968, and Engineering Summary of Powerplant Icing Technical Data, FAA Report No. RD-77-76 dated July 1977. Although most of the information contained in these reports is still valid, some is outdated, and more usable information is now available through recent research and experience. Therefore, this work was directed towards developing an updated and more comprehensive combined version of Report ADS-4 and RD-77-76 that includes reference material on ground and airborne icing facilities, simulation procedures, and analytical techniques. This document represents all types and classes of aircraft and is intended as a working tool for the designer and analyst of ice protection systems., See also Volume 2, AD-A238 040 and Rept. nos. FAA-ADS4 dated Dec 63, AD-608 865 and FAA-RD-77-76 dated Jul 77, AD-A045 087.

The design and validation of adequate aircraft ice protection has evolved into a specialized and technical complex area where many engineering disciplines are involved; namely, aeronautical, electrical, mechanical, electronics, chemical simulations, mathematical modeling, airframe/engine systems design, atmospheric physics, and meteorology. Research advances in any one discipline have a direct effect on updating the procedural technology used in the design and validation of ice protection configurations, equipment, and systems. Periodically the Federal Aviation Administration (FAA) provides documentation to assist regulatory certification teams and industry design engineers in standardizing testing and validating procedures. Examples of such documentation are Engineering Summary of Airframe Icing Technical Data, FAA report No. ADS-4 dated December 1968, and Engineering Summary of Powerplant Icing Technical Data, FAA Report No. RD-77-76 dated July 1977. Although most of the information contained in these reports is still valid, some is outdated, and more usable information is now available through recent research and experience. Therefore, this work was directed towards developing an updated and more comprehensive combined version of Report ADS-4 and RD-77-76 that includes reference material on ground and airborne icing facilities, simulation procedures, and analytical techniques. This document represents all types and classes of aircraft and is intended as a working tool for the designer and analyst of ice protection systems., See also Volume 1, AD-A238 039 and Rept. nos. FAA-ADS4 dated Dec 63, AD-608 865 and FAA-RD-77-76 dated Jul 77, AD-A045 087.

Tato práce se zabývá statickou a dynamickou analýzou vyhlídkové věže. Jedná se o dřevěnou rozhledu v obci Bohdaneč. Pro dynamickou analýzu byl vytvořen podrobný výpočtový model v programu ANSYS. Statická analýza byla provedena v programu Scia Engineer. Oba programy využívají metodu konečných prvků. Pozornost byla věnována zatížení větrem dle Eurokódu 1, zatížení námrazou, výpočtu dynamického součinitele a odezvě na odtrhávání vírů. Práce obsahuje také posouzení vybraných částí konstrukce dle Eurokódů., This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.

Tato práce se zabývá statickou a dynamickou analýzou vyhlídkové věže. Jedná se o dřevěnou rozhledu v obci Bohdaneč. Pro dynamickou analýzu byl vytvořen podrobný výpočtový model v programu ANSYS. Statická analýza byla provedena v programu Scia Engineer. Oba programy využívají metodu konečných prvků. Pozornost byla věnována zatížení větrem dle Eurokódu 1, zatížení námrazou, výpočtu dynamického součinitele a odezvě na odtrhávání vírů. Práce obsahuje také posouzení vybraných částí konstrukce dle Eurokódů., This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.

Tato práce se zabývá statickou a dynamickou analýzou vyhlídkové věže. Jedná se o dřevěnou rozhledu v obci Bohdaneč. Pro dynamickou analýzu byl vytvořen podrobný výpočtový model v programu ANSYS. Statická analýza byla provedena v programu Scia Engineer. Oba programy využívají metodu konečných prvků. Pozornost byla věnována zatížení větrem dle Eurokódu 1, zatížení námrazou, výpočtu dynamického součinitele a odezvě na odtrhávání vírů. Práce obsahuje také posouzení vybraných částí konstrukce dle Eurokódů., This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.

Tato práce se zabývá statickou a dynamickou analýzou vyhlídkové věže. Jedná se o dřevěnou rozhledu v obci Bohdaneč. Pro dynamickou analýzu byl vytvořen podrobný výpočtový model v programu ANSYS. Statická analýza byla provedena v programu Scia Engineer. Oba programy využívají metodu konečných prvků. Pozornost byla věnována zatížení větrem dle Eurokódu 1, zatížení námrazou, výpočtu dynamického součinitele a odezvě na odtrhávání vírů. Práce obsahuje také posouzení vybraných částí konstrukce dle Eurokódů., This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.

Tato práce se zabývá statickou a dynamickou analýzou vyhlídkové věže. Jedná se o dřevěnou rozhledu v obci Bohdaneč. Pro dynamickou analýzu byl vytvořen podrobný výpočtový model v programu ANSYS. Statická analýza byla provedena v programu Scia Engineer. Oba programy využívají metodu konečných prvků. Pozornost byla věnována zatížení větrem dle Eurokódu 1, zatížení námrazou, výpočtu dynamického součinitele a odezvě na odtrhávání vírů. Práce obsahuje také posouzení vybraných částí konstrukce dle Eurokódů., This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.