This thesis contributes to the state of the art in integrated design of insect-scale piezoelectric actuated flapping wing vehicles through the development of novel theoretical models for flapping wing aerodynamics and piezoelectric actuator dynamics, and integration of these models into a closed form design process. A comprehensive literature review of available engineered designs of miniature rotary and flapping wing vehicles is provided. A novel taxonomy based on wing and actuator kinematics is proposed as an effective means of classifying the large variation of vehicle configurations currently under development. The most successful insect-scale vehicles developed to date have used piezoelectric actuation, system resonance for motion amplification, and passive wing pitching. A novel analytical treatment is proposed to quantify induced power losses in normal hover that accounts for the effects of non uniform downwash, wake periodicity and effective flapping disc area. Two different quasi-steady aerodynamic modelling approaches are undertaken, one based on blade element analysis and one based on lifting line theory. Both approaches are explicitly linked to the underlying flow physics and, unlike a number of competing approaches, do not require empirical data. Models have been successfully validated against experimental and numerical data from the literature. These models have allowed improved insight into the role of the wing leading-edge vortex in lift augmentation and quantification of the comparative contributions of induced and profile drag for insect-like wings in hover. Theoretical aerodynamic analysis has been used to identify a theoretical solution for the optimum planform for a flapping wing in terms of chord and twist as a function of span. It is shown that an untwisted elliptical planform minimises profile power, whereas a more highly tapered design such as that found on a hummingbird minimises induced power. Aero-optimum wing kinematics for hovering are also assessed. It is shown that for efficient flight the flapping velocity should be constant whereas for maximum effectiveness the flapping velocity should be sinusoidal. For both cases, the wing pitching at stroke reversal should be as rapid as possible. A dynamic electromechanical model of piezoelectric bending actuators has been developed and validated against data obtained from experiments undertaken as part of this thesis. An expression for the electromechanical coupling factor (EMCF) is extracted from the analytical model and is used to understand the influence of actuator design variables on actuator performance. It is found that the variation in EMCF with design variables is similar for both static and dynamic operation, however for light damping the dynamic EMCF will typically be an order of magnitude greater than for static operation. Theoretical contributions to aerodynamic and electromechanical modelling are integrated into a low order design method for propulsion system sizing. The method is unique in that aside from mass fraction estimation, the underlying models are fully physics based. The transparency of the design method provides the designer with clear insight into effects of changing core design variables such as the maximum flapping amplitude, wing mass, transmission ratio, piezoelectric characteristics on the overall design solution. Whilst the wing mass is only around 10% of the actuator mass, the effective wing mass is 16 times the effective actuator mass for a typical transmission ratio of 10 and hence the wing mass dominates the inertial contribution to the system dynamics. For optimum aerodynamic effectiveness and efficiency it is important to achieve high flapping amplitudes, however this is typically limited by the maximum allowable field strength of the piezoelectric material used in the actuator.

This diploma thesis deals with constructional design and a calculation of one-girder bridge crane with the requested primary parametres: lifting capacity 10 000 kg, span 12 000 mm, wheel base 2 500 mm, travel height 7 000 mm. In diploma thesis, there is executed analysis of constructional designs of box girders, drawn up technical report with the analysis of the choice of the construction with important technical and physical calculations. Calculations were executed according to valid Czech state norms and literature. Drawing documentation is enclosed to this thesis.

This thesis deals with the design of a crane hook block with a capacity of 20 tons with two guiding and one equalizing roller for handling sheet metal coils. The work includes the calculation and design of the elements and strength calculations of individual parts. Part of the work is the drawings of the given assemblies.

The focus of this thesis is the construction of a single girder overhead crane. The goal is to render a crane construction according to preset parameters. The parameters include a lifting power of 8,000 kg, a 10,000 mm reach, a 2,400 mm wheelbase and a stroke of 8,000 mm. The thesis includes brief theoretical research focused on overhead cranes, their various types and description of their main components. Brief description of chosen parameters for the construction itself follows. The description of chosen parameters includes calculations of strain acting during operation, technical and stability parameters, essential for the construction. All calculations were made with regard to valid Czech technical standards and specialized literature which focuses on the construction of cranes and their parts. Finally, the thesis is extended by the required technical drawings.

The thesis titled Biogas Plant Pikárec deals with the building technology preparation and implementation of the construction. Construction of a biogas plant consists of six main buildings which will be implemented in the area of agricultural cooperatives during its operation. All buildings will be designed as reinforced concrete. The aim of the thesis is the design time, financial and material resources to ensure the smooth progress of construction.

The diploma thesis is focused on the construction design of elevator for pallets with car seats weighing 200 kg. This device is proposed for vertical transport of the load between two working positions which are separated by 6m. Part of the pallet hoist is a roller conveyor attached on a lifting frame. The roller conveyor allows loading and unloading pallets from the fixed roller conveyors in the lower and upper station. There are the functional calculations of important parts, strength control of traction belt and shaft of driving pulley drum. By FEM (Finite Element Method) is detected stress distribution of the lifting frame. Parts of the annex are the manufacturing drawings of the lifting frame, shaft of driving drum, the driving station and drawing of the whole assembly vertical conveyor. Furthermore, the timing diagram function for one cycle, risk analysis and FMEA.

For the transport of their spacecraft from the vehicle assembly building to the launch pads at Kennedy Space Centre, Florida, the National Aeronautics and Space Administration (NASA) is using two special crawler transporters since 1965. First developed for the Saturn V rocket the crawler transporters have been sufficient for all following generations of space ships so far. But for the new generation of Orionspacecraft which is under development now, a load capacity increase for the crawler transporter of plus 50% was necessary. For this task Hunger Hydraulik did develop new jacking, equalizing and levelling (JEL) cylinders with sufficient load capacity but also with some new features to improve the availability, reliability and safety of this system. After design approval and manufacture of the cylinders they have been tested in a special developed one-to-one scale dynamic test rig and after passing this the cylinders had to prove their performance in the crawler transporter itself. This article describes the general application and introduces the technical requirements of this project as well as the realized solution.

<p>Lumbalni bol predstavlja jedan od najučestalijih zdravstvenih problema dana&scaron;njice. Pružanje zdravstvene nege je stresan i težak fizički posao, te spada u grupu visoko-rizičnih poslova za nastanak lumbalnog bola, pa samim tim medicinske sestre &ndash; tehničari predstavljaju vulnerabilnu populaciju. Osnovni ciljevi ovog istraživanja bili su da se utvrdi prevalencija i faktori rizika za nastanak lumbalnog bola kod medicinskih sestara- tehničara, kao i mere prevencije. Istraživanje je sprovedeno u pet zdravstvenih ustanova sa područja Vojvodine u obliku studije preseka, anketiranjem medicinskih sestara &ndash; tehničara. Za ispitivanje je kori&scaron;ćen modifikovani Nordijski upitnik. Rezultati pokazuju veoma visoku prevalenciju lumbalnog bola među medicinskim sestrama- tehničarima, oko 94%. Ispitanici su bili uglavnom ženskog pola, prosečne starosti oko 38 godina. Najveći broj ispitanika ima srednju stručnu spremu. Istraživanjem je utvrđeno da postoji statistički značajna povezanost lumbalnog bola sa porastom godina života i dužine ekspozicionog radnog staža. Takođe, statistički visoko značajna korelacija nalazi se između porasta BMI i lumbalnog bola. Najzastupljeniji poslovi zdravstvene nege koje ispitanici sa lumbalnim bolom obavljaju su: pozicioniranje pacijenata, podizanje i presvlačenje pacijenata u postelji i podela terapije. Statistički značajno veća zastupljenost lumbalnog bola javlja se kod ispitanika koji sami obavljaju negu u odnosu na one koji imaju pomoć. Medicinske sestre &ndash; tehničari koji pripadaju grupi sa vi&scaron;im nivoom stresa na radnom mestu imaju znatno veći rizik za pojavu lumbalnog bola. Smenski rad (naizmenične dnevne i noćne smene od 12 sati) i prekovremeni rad duži od 8 sati dnevno, podizanje tereta većeg od 25 kg i broj pacijenata koje medicinska sestra &ndash; tehničar zbrinjava tokom radnog vremena nemaju značajnu povezanost sa pojavom lumbalnog bola. Oko tri četvrtine ispitanika nije izostajalo sa posla zbog bola. Samo oko 8% ispitanika je promenilo radno mesto zbog lumbalnog bola i ide redovno na periodične lekarske preglede. Kod mera prevencije neophodno je staviti akcenat na smanjenje fizičkog opterećenja donjeg dela leđa i smanjenje ručnog preno&scaron;enja tereta. Primenom adekvatnog ergonomskog pristupa, boljom organizacijom rada, podsticajnom atmosferom na poslu i spremno&scaron;ću nadležnih struktura da iskažu veću brigu prema zaposlenima, smanjila bi se učestalost pojave lumbalnog bola.</p> / <p>One of the today&rsquo;s most frequent health problems is the low back pain. Nursing is stressful and hard physical job which belongs to the group of high-risk jobs that could cause low back pain and therefore medical nurses/technicians represent the vulnerable population. Determination of prevalence, risk factors and prevention of the low back pain were the main goals of this research. The research in the form of cross-sectional study was conducted with nurses filling in the surveys within five medical institutions in Vojvodina. The modified Nordic questionnaire was used for the surveys. The results show very high prevalence of the low back pain, cca 94%, among medical nurses. Most of the respondents were females, who finished high school education, at average age of 38 years. The study showed that there is a statistically significant coherence between low back pain, ageing and working experience as a nurse. There is also a statistically significant coherence between the low back pain and the increase of the BMI. The most common nursing jobs that respondents with the low back pain do are: positioning of patients, lifting patients, dressing patients in bed and giving therapy. The low back pain with the respondents who do the nursing just by themselves is statistically significantly more present then with the respondents who do the nursing with help. Nurses who suffer more stress at their workplaces have a significantly higher risk to develop low back pain. Working 12 hour shifts (alternately day and night shifts), overtime work, more then 25 kg weight lifting and number of patients for nursing per nurse during working hours have no significant correlation with the low back pain occurrence. About three quarters of the respondents had no absence from work caused by the low back pain. Only 8% of the respondents changed their workplace because of the low back pain and have regular health checks. To prevent the low back pain it is necessary to emphasize the physical reduction of the load on the lower back and manual handling of loads. The frequent low back pain with the nurses could be reduced with the appropriate ergonomic access, better work organization, a supportive atmosphere at work and the willingness of responsible authorities to express greater concern about the employees.</p>

The masters thesis with the name Nursery school and multifunctional building Želivec solves preparation and realization of building. The aim of masters thesis is to design of time, financial and material resources. The thesis contains budget, time schedule, building-site, technological standard, control and trial plan, assessment of lifting mechanism and study of realization of the main stages. The thesis is prepared on the basis of technical documents submitted by the designer. Part of the thesis is specialization.

Two models of a self-stabilizing hydrofoil system is developed where the effects from the struts and hydrofoil give torques for angular rotations. Lifting line theory for the hydrofoil which can twist is used. Nonlinear versions of the models are also developed and compared to find that the linear models use valid approximations. Backward Differentiation Formula is used to get numerical solutions, and eigenvalues of linear system matrices are used to get stability regions. The models did not accurately capture what has been seen in testing. / Två modeller för ett självstabiliserande bärplanssystem utvecklas där effekter från stöttor och bärplan ger vridmoment för vinkelrotationer. Lyftande linjeteori för det skevande bärplanet används. Icke-linjära versioner av modellerna tas också fram och jämförs för att finna att de linjära modellerna använder giltiga approximationer. Backward Differentiation Formula används för att fram numeriska lösningar, och egenvärden i det linjära systemetsmatriser används för att hitta stabilitetsregioner. Modellerna fångade inte korrekt vad som har setts i testning.