Jacek Karliński

The Operator Protective Structures Testing for Mining Machines

The study presents selected problems concerning the testing of protective structures for the mining machines in the field of passive safety. Such machines equipped with protective structures must meet the requirements of the relevant regulations and standards. Requirements of conducting experimental tests of protective structures: FOPS, ROPS and RSPS are specified. The paper provides the principles of development of computational models for numerical simulations by means of finite element method. A detailed example of comparison of experimental and simulation results for a protective structure is presented.

Design and Numerical Analysis of a Roof-Mounted Bicycle Carrier

The purpose of this paper is to present the design process and subsequent numerical analysis calculations of a new roof-mounted bicycle carrier for vehicles. The bicycle carrier is mounted on the vehicles longitudinal bars. The designed construction is subjected to both static and dynamic load sets to check if it meets the requirements of ISO 11154 norm – which specifies the minimum safety requests for roof load carrier intended for mounting on the roof of passengers cars and light commercial vehicles with a maximum authorized total mass up to 3,5t. To fulfil the specifications associated to safety, standards and traffic laws test four different software packages were used: CATIA V5 and NACA airfoil generator for designing, Cambridge Engineering Selector for choosing the most suitable materials and Abaqus CAE for Finite Element Analysis.

Identification of Internal Stresses in Bolted Flanged Joints

In bolted flange joints of flexible constructional elements, bolts are subjected not only to tension and torsion but also to bending loads. Identification of straining of each bolt is only possible by means of numerical methods e.g. the finite element method. In the case of large objects, the calculation problem is faithful projection of the phenomena occurring in direct zone of the contact of screw-nut pair. The application of global equivalent models of the whole joint is necessary in order to make it possible to precisely determine internal loads in individual bolts and then local models to establish stress fields necessary to assign durability. Calculation methodology based on the construction of two coherent models has been described: global - for the entire flange joint, and local - for a single bolt joint. The elaborated methodology was applied to evaluate a flange joint in a heat exchanger with rotating heating surfaces that was subject to damage. The causes of damage of the flange joint were determined.

Numerical Simulations of Composite Frontal Protection System According to EC 78/2009

According to Regulation (EC) 78/2009 currently in force in the European Union the frontal protection system (FPS) is a separate structure, which is intended to protect the external surface of the vehicle, from damage in the event of a collision. The use of FPS was the subject of many discussions. This was mainly due to the increasing popularity of Sport Utility Vehicles (SUV) with non-compliant bull bars fitted by owners. It should be noted that, in most cases, installing an FPS on a SUV is simply a matter of car tuning. The purpose of such modifications is to make the vehicle appear more aggressive and stand out against similar cars. The problem came when frontal protection systems became merely a fashionable decoration of sport utility vehicles in place of their original function. Unfortunately, due to their growing popularity, SUVs are increasingly involved in accidents involving pedestrians. Over the years, vehicles equipped with bull bars have been causing an increasing number of pedestrian deaths and therefore specific requirements were introduced for this component. The paper presents numerical comparison of FPS made of steel and fiberglass according to the current regulations. A notable difference in legform acceleration was noted, which indicates a good potential in fiberglass usage as a base material for FPS.