For loading of excavator drive units, it is necessary to use electromechanical loads with a high torque up to 16,000 Nm in a low speed range from 0 to 150 min-1 with a maximum output of 50 kW. The electromechanical load consists of an asynchronous dynamometer assembly with a tilting torque measurement system in conjunction with a front three-speed gearbox. The dynamometer is powered by a converter with vector control. To determine the torque at the gearbox output, a correction must be made and the influence of operating temperature and operating speed must be taken into account. Experimental measurement of these influences and dependencies makes it possible to create a mathematical model that can be implemented in the power converter for torque control at the output of the gearbox. The aim of the master thesis is a brief design of the loading drive, design an implementation of experimental measurement of efficiency maps and evaluation of the influence of inefficiency of gearbox efficiency.

The content of this thesis is the proposal of modernization of brake site in engine testing cell of Institute of Automotive Engineering. The main part focuses on the design of individual components for attaching the motorcycle engine Husaberg FE 570. Finally, work is the preparation of the measuring head to determine and optimize the performance parameters of the test engine.

This thesis deals with two-stroke engine design modifications to enhance its performance parameters. The introduction summarizes the various solutions of two-stroke engines. The next part deals with design modifications of the engine power, their implementation and subsequent modification. The work includes strain and stress analysis of the piston, which includes a complete indication of pressures in two-stroke engine. The achieved results of FEM analysis were used to design better piston geometry.

5 Summary So far, no commercially used device, capable of evaluating the condition of the deep stabilizing spine system (DSSS), has appeared on the market. Therefore, a so called muscle dynamometer (SD01, SD02), has been constructed that enables to reveal a possible dysfunction of the DSSS. During a six-week-rehabilitation-course, aimed at correcting the body posture and strengthening the DSSS muscles, a statistically significant change (p<0.001) between the values of input and output measurements of the chosen group tested has been obtained. Correctness of the approach to objectify the initial state of the patient and his progress during the treatment was shown by the completed measurements. The effectiveness of therapeutical training was confirmed. Based on positive experience from SD01, a new version of muscle dynamometer, SD02, was constructed. Measurements by SD02 were to establish the condition of DSSS (frontal spine stabilization) by a lay-sit test repeatedly from the test battery UNIFITTEST 6-60 and by the diaphragm test. Measurements were conducted on 45 samples. Basic somatic measurements were performed and then measurements with the SD02 were conducted during the diaphragm test and UNIFITTEST. For comparison of the values the pairing t-test was used (normal data distribution was verified by the...

The aim of the work was to measure and evaluate the strength of deep stabilizing system (DSS) in connection with correct body posture and, subsequently, to asses the efficiency of the existing known exercise of the lumbar spine area as well as drawing comparison to the exercise recently introduced by doc. PaedDr. Pavel Kolář. The research was carried out on two sample groups of sixth form boys attending elementary school. It was necessary in the first place to detect, test and document correct body posture and, above all, the functionality of the DSS in members of the respected groups. This was followed by six weeks of active exercise according to exercise programme focusing primarily on the lumber spine area. The control group of ten boys carried out exercises based mainly on general principles of correct exercise whereas the experimental group totalling the same number of boys did exercises of DSS and lumbar spine area according to doc. PaedDr. Pavel Kolář. A muscle dynamometer was used to objectify and check the DSM in lumbar spine area. The measuring was than documented, processed and evaluated by means of charts and graphs. The work also comprises an overview of basic principles of lumbar spine stability as well as a questionnaire designed to assess health and lifestyle.\\

The theoretical part of the thesis contains a brief overview of some experimental methods that are used in machining technologies. The experimental part at first elaborates on the analysis of two titanium alloys. The actual experiment, which consists of milling of the two aforementioned materials with the use of several tools and holders, is then described. It was conducted in collaboration with the company Frentech Aerospace s.r.o. When milling, forces were measured with piezoelectric dynamometer. Further, the analysis of acquired data that is followed with discussion about its main findings, is provided. The conclusion of the thesis deals with the found facts corresponding with the information obtained by analysis of materials. The main results arise out of the comparison of used combinations of tools and holders for milling of material Ti-Al6-V4, observation of impact of particular factors on measured force, or out of different values of measured forces when milling two given materials.