The paper deals with the rotor vibration in journal bearings to prepare a model for verifying the rotor vibration active control. The rotor is maintained in equilibrium position by forces generated in oil film. Bearing forces can be modelled as a spring and damper system. The main goal of the simulation study is to verify the model principle and to estimate parameters by comparing simulation results with experimental data, namely the instability of motion. Test stand with rotor supported in two journal bearings was designed for these purposes. The stand will be equipped with four piezoactuators enabling excitation of bearings by practically arbitrary dynamic force. Theoretical analysis of the influence of external excitation on rotor behaviour was carried out. Up to now the study shows that simple kinematic excitation is effective for reducing rotor excursion while passing critical speeds. To suppress self-exciting vibration of the rotor it is necessary to look for more sophisticated solution. and Obsahuje seznam literatury
a1_This paper considers the influence of Enlightenment thinking on the pedagogical works of Jan Valerián Jirsík (1798-1883), who earned a place in Czech history as a priest, theologian, active patriot, education campaigner, pedagogue, writer and not least as the fourth Bishop of České Budějovice (Budweis), an office he held from 1851 until his death. Primarily, it draws on and follows up ideas in the writings of the theologian Ctirad Václav Pospíšil and the church historian Kamila Veverková, who both trace the links between Jirsík the theologist and thinkers associated with Bernard Bolzano. Jirsík’s early writings, however, are as much concerned with pedagogy as they are with theology, and the aim of this study is to discover whether his ideas on education were similarly influenced by Enlightenment thinking. It analyses his views on the subject before 1851, i.e. until he became Bishop of Budweis - specifically in the period 1826-1843, when he was much occupied with questions of education and upbringing. In his years as bishop he devoted little time to literary pursuits. The study concludes that the legacy of the Enlightenment era most certainly played an important part in Jirsík’s deliberations on education. There is, however, a certain progression discernible in his thinking. In the early period, of which Sunday School (1826) is a representative text, we see the influence of contemporary Enlightenment clerical pedagogy as he advocates extending human knowledge through reason in order to improve living conditions. Faith and religion are also factors here, especially in his emphasis on the positive role of God the Creator. In the second period under consideration (1836-43), we find closer parallels between Jirsík’s pedagogical and theological thinking., a2_Within ten years of writing Sunday School, his position had shifted from that of a priest attempting to expand or improve education in the spirit of Enlightenment ecclesiastical pedagogy to that of a theologian (and so-called ‘true’ enlightener) who from theological considerations drew conclusions for the educational process. In Jirsík’s view, Christianity and Enlightenment go hand in hand, serving to elevate human life spiritually as well as materially. For him education means the enlightenment of both soul and reason. Nor does he see any contradiction between faith and rationality. It is evident from his thinking that he was convinced of the need to implement the pedagogical ideal of the Enlightenment: to educate virtuous citizens who were also rational., Rudolf Svoboda., and Obsahuje bibliografické odkazy
This study aims to present the problems of the perspective of Catholic theology and Catholic historiography on the Enlightenment. In its first part it attempts to find an answer to the question: is the Church History rather theological or historical discipline? Then it shows some specifics of the Catholic perspective in the Church History discipline before and after the 2nd Vatican Council. In its second part it shows reflection of the problems of Enlightenment in the Catholic theology. In the next part this study dwells on discussion about understanding of Enlightenment in history since 1908 till now. In its last part shows reflection of theological and historical research in the Bohemian area before and after the 2nd Vatican Council., Rudolf Svoboda., and Obsahuje bibliografické odkazy