National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Vehicle Bumstops and Reboundstops
Mikeš, Josef ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The aim of this master’s thesis is to create a mathematical description of the functioning of vehicle suspension stops. There are two basic types of suspension stops, mechanical and hydraulic. The mechanical one accumulates energy at the end of the suspension stroke, The hydraulic one converts the residual energy into heat. In order to understand the problem of stops, research on the function and current trends in the design of stops is carried out in the first part of the thesis. This work includes an investigation of the effect of stop positioning and stop characteristics on vehicle behaviour. The characterization was investigated by changing of the force ramp intensity and adjusting the global stiffness of the stops. By varying the onset of action of the hydraulic and mechanical stops, there is a position in which the driving characteristics of the car are improved. It is advantageous to use this position in the design of the stops. The result of comparing the different options is a design of suspension stops for a particular vehicle. Due to the action of the hydraulic stop, the damping oil is heated, but by checking the dissipated energy it can be concluded that this heating is quite minimal.
Design of a device for the combination of manual operations during production of thermostable detonators
Mikeš, Josef ; Galas, Radovan (referee) ; Svoboda, Petr (advisor)
This thesis deals with problematics of a production jig needed for the combination of manual operations during production of thermostable detonators. The goal was to propose ergonomic, practical and functional device which replaces current inconvenient type of manufacture. The thesis focuses on a description and a following usage of standardized parts. Having determined the required parameters, the design of the production jig with the use of pneumatic elements was chosen. The assigned goal as well as the partial goals were fulfilled. The result is a complete design of the production jig, which excludes difficult manual stripping of insulation from a conductor. The assessment of time savings for each one of the operations performed by an operator of the production jig was made for the final design. By the implementation of the jig to the manufacture the time of a higher qualified worker, who does not need to help the operator with stripping of the insulation anymore, is saved as well. The thesis contains basics of the problematics of the detonators, principles of their function, way of production of selected parts, overview of usable standardized parts and the actual solution of construction of the whole production jig including the construction documentation and usage guideline.
Detection and Vizualization of Features in a Point Cloud
Kratochvíl, Jiří Jaroslav ; Mikeš, Josef (referee) ; Martišek, Dalibor (referee) ; Procházková, Jana (advisor)
The point cloud is an unorganized set of points with 3D coordinates (x, y, z) which represents a real object. These point clouds are acquired by the technology called 3D scanning. This scanning technique can be done by various methods, such as LIDAR (Light Detection And Ranging) or by utilizing recently developed 3D scanners. Point clouds can be therefore used in various applications, such as mechanical or reverse engineering, rapid prototyping, biology, nuclear physics or virtual reality. Therefore in this doctoral Ph.D. thesis, I focus on feature detection and visualization in a point cloud. These features represent parts of the object that can be described by the well--known mathematical model (lines, planes, helices etc.). The points on the sharp edges are especialy problematic for commonly used methods. Therefore, I focus on detection of these problematic points. This doctoral Ph.D. thesis presents a new algorithm for precise detection of these problematic points. Visualization of these points is done by a modified curve fitting algoritm with a new weight function that leads to better results. Each of the proposed methods were tested on real data sets and compared with contemporary published methods.

See also: similar author names
4 MIKEŠ, Jiří
11 Mikeš, Jan
4 Mikeš, Jiří
Interested in being notified about new results for this query?
Subscribe to the RSS feed.