1000 Meilen unter Strom, Rekordfahrt des in Offenburg entwickelten eFahrzeugs "Schluckspecht"

Nach der Entwicklung eines sparsamen Demonstrationsfahrzeugs mit Dieselmotor und Brennstoffzellenfahrzeuge wurde ein Batteriefahrzeug entwickelt, das in Südafrika unter der Aufsicht von FIA-Ingenieuren 626,6 km fuhr, ohne dass die Batterie aufgeladen werden musste. Ein Demonstrationsfahrzeug des Japan Electrical Vehicle Club hielt den damaligen Weltrekordmit 555,6 km.In 2010 the Japan Electric Vehicle Club set the world record for the longest distance covered by an electrically powered vehicle without recharging its battery: 1003 km. This record was the challenge for the Schluckspecht-Team whose main aim has been to whittle down the energy consumption of vehicles. A new type of hub motors was developed, reducing the losses in the motor and enabeling new vehicle designs with improved aerodynamics. A new chassis structure was designed and developed, reducing the weight of the vehicle, as this structure is well adopted to the demand of an electric vehicle (relatively heigh battery mass compared to the overall mass of the vehicle). A test on the Bosch test circuit showed that this vehicle can even drive 1631,5 km (more than 1000 miles). The test was withnessed by the TÜV Süd

Abrasive waterjet machining of three-dimensional structures from bulk metallic glasses and comparison with other techniques

Bulk metallic glasses (BMGs) are a promising class of engineering materials, but they can be difficult to machine due to high hardness and a metastable structure. Crystallization due to machining can have negative effects, such as a decreased load-bearing capacity of fabricated parts, and thus should be avoided. Here, a Zr-based BMG was machined using abrasive waterjet (AWJ), electrical discharge, ns-pulsed laser engraving, and conventional dry-milling techniques. Characterization of the processed material indicated that AWJ preserves the amorphous phase and provides the combination of speed and flexibility required to rapidly fabricate small three-dimensional parts, while the other techniques did not achieve these goals. As proof-of-principle, a screw, similar to an orthopedic implant, was rapidly machined from the BMG using AW

26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 - Meeting Abstracts - Antwerp, Belgium. 15–20 July 2017

This work was produced as part of the activities of FAPESP Research,\ud Disseminations and Innovation Center for Neuromathematics (grant\ud 2013/07699-0, S. Paulo Research Foundation). NLK is supported by a\ud FAPESP postdoctoral fellowship (grant 2016/03855-5). ACR is partially\ud supported by a CNPq fellowship (grant 306251/2014-0)

ANALYSIS OF SCORE FUNCTIONS FOR THE AUTOMATIC REGISTRATION OF TERRESTRIAL LASER SCANS

e.g. for surveying purposes, cultural heritage, city modelling or architectural applications. Usually different points of view are necessary to acquire an object completely. The task of finding the relative orientation between several scan positions is termed as registration. Research work in data driven methods for the registration of point clouds was frequently published the last decade. A distinction between coarse registration and fine registration has been drawn. We use a featurebased registration to search for a coarse orientation. The transformation parameters are calculated by establishing correspondences between extracted planes. An efficient search strategy delivers possible candidates. The focus of this paper lies in the verification phase that is responsible for picking the correct solution. A score function is used to evaluate the candidates of probabilistic solutions for the searched transformation. The goal of a score function is to get a reliable indication, which solution is best. Ideally, the score function attains its maximum for the correct solution and is significantly larger than the score of any wrong solution.

Registration of terrestrial laser scanning data using planar patches and image data

The fully automatic registration of terrestrial scan data is still a major topic for many research groups. Existent methods used in commercial software often use artificial markers which are placed in the scene and measured from each scan position. This is a reliable method to get the transformation parameters, but it is not very efficient. These manual or semi-automated registration techniques should be substituted by new methods in order to make terrestrial laser scanning also profitable for larger projects. In this paper we present a registration method based on the extraction of planar patches from 3D laser scanning data. A search technique is used to find corresponding patches in two overlapping scan positions. Since laser scanning instruments are nowadays often equipped with an additional image sensor, we also use the image information to improve the registration process. Assuming that the calibration parameters of a hybrid sensor system are known, the extracted planar patches can be textured automatically. The correlation between corresponding textured patches can be calculated and the registration method is improved by shifting the patches until they fit best

Automatic relative orientation of terrestrial laser scans using planar structures and angle constraints

The relative orientation of independently acquired terrestrial laser scan point clouds is an important task. If good starting values are available, well-known iterative algorithms exist to determine the required transformation. In this paper, we describe a method to obtain such starting values fully automatically, which is applicable to scenes containing planar elements. Our method first extracts planar patches in each scan individually and then assigns patch triples across scans in order to compute the rotation and translation component of the relative orientation. We assess the performance of our approach using a set of 20 terrestrial scans acquired systematically at increasing distance. For each scan, we automatically extract the 50 largest planar patches. We show that, although there are 1.15 billion possible patch triple assignments, we are able to compute efficiently a ranked list of possible transformations where the correct transformation is usually within the first few positions. For our test data and three test runs, it has been among the first 53 positions, even for scans with little overlap. Thus, instead of 1.15 billion candidate solutions, the score function needs only to evaluate on the order of 100 candidate solutions, which is an improvement by a factor of 10 7.

Automatic matching of terrestrial scan data as a basis for the generation of detailed 3D city models

The request for three-dimensional digital city models is increasing and also the need to have more precise and realistic models. In the past, 3D models have been relatively simple. The models were derived from aerial images or laser scanning data and the extracted buildings were represented by simple shapes. However, for some applications, like navigation with landmarks or virtual city tours, the level of details of such models is not high enough. The user demands more detailed and realistic models. Nowadays, the generation of detailed city models includes usually a large amount of manual work, since single buildings are often reconstructed using CAD software packages and the texture of facades is mapped manually to the building primitives. Using terrestrial laser scanners, accurate and dense 3D point clouds can be obtained. This data can be used to generate detailed 3D-models, which also include facade structures. Since the technology of laser scanning in the field of terrestrial data acquisition for surveying purposes is new, the processing of the data is only poorly conceived. This paper makes a contribution to the automatic registration of terrestrial laser scanning data recorded from different viewpoints. Up to now, vendors of laser scanners mainly use manual registration mechanisms combined with artificial targets such as retro-reflectors or balls to register single scans. Since these methods are not fully automated, the registration of different scans is time consuming. Furthermore, the targets must be placed sensibly within the scan volume, and often require extra detail scans of the targets in order to achieve accurate transformation parameters. In this paper it is shown how to register different scans using only the measured point clouds themselves without the use of special targets in the surveyed area.

Laser fabrication of diamond micro-cutting tool-related geometries using a high-numerical aperture micro-scanning system

The machining of micro-geometries requires a corresponding micro-cutting tool. Up to now, industry primarily fabricates such tools by grinding or electrical discharge machining. In this paper, an overview of the direct laser fabrication of micro-cutting tool-related geometries on polycrystalline diamond composites and single crystal diamond is presented. This is made possible using picosecond laser pulses operating at second harmonics and a micro-scanning deflection system exhibiting a high-numerical aperture. The generated geometries are inspected using scanning electron microscopy while quality of the cutting edge radius and graphitisation is investigated. The laser ablation process is further enhanced by demonstrating the feasibility of a sequential roughing and finishing strategy.ISSN:0268-3768ISSN:1433-301