Jakub Wróbel

• Doctor of Engineering
• Wrocław University of Science and Technology

This paper investigates the structural dynamics of a UAV composite wing through FEM simulations and experimental modal analysis, aiming to replace traditional experimental testing in UAV structural evaluations. The simulations, performed with Ansys Composite Prep/Post (ACP), model each composite layer with specific fiber orientations, material prop...

The dynamic response of an aerial vehicle structure is a key parameter that must be determined before further aeroelastic phenomena can be analysed in the aerospace sector. Natural frequencies, mode shapes, and damping can be measured or predicted through experimental, operational, or computational studies. To reduce the costs and complexity of exp...

This study optimizes the structural design of a composite wing shell by minimizing mass and maximizing the first natural frequency. The analysis focuses on the effects of polyvinyl chloride (PVC) foam thickness and the fiber orientation angle of the inner carbon layers, with the outer layers fixed at ±45° for torsional rigidity. A Multi-Objective G...

Low noise fluid power units become a rapidly increasing demand in modern industry. This paper describes the generation of vibrations and noise in fluid power units, which in many industrial applications have a decisive influence on the increased noise emission. The causes of vibrations and noise in displacement pumps were first described which are...

This paper deals with noise and vibration problems in electric power steering systems used in modern automotive platforms. Various types of commonly used power steering systems are presented. The noise and vibration performance of new EPS designs can have a significant impact on users. Computational FEM methods used to investigate the dynamic prope...

Increased demanding in the fields of noise pollution, human comfort and health finds its prints in the development of automotive components. The paper presents general problems of noise and vibration in the vehicles. Main sources and transfer paths are identified. The sound quality-psychoacoustic aspects are also described. In the second part of th...

The ongoing shift towards hybrid and electric vehicles has a strong impact on noise and vibration engineering. New, complex dynamic phenomena are brought to vehicle user attention due to the absence of internal combustion engines and the significant role in vehicle and drive feel perception. This paper presents an FEM (Finite Element Method) dynami...

This paper deals with the problem of heat accumulation in acoustic enclosures. Increased noise levels at production sites or manufacturing lines force the application of acoustic enclosures. Effective noise reduction due to enclosures often comes with the additional thermal insulation of the device, which in many cases causes a strong increase in t...

This paper deals with noise problems in industrial sites adapted for commercial training venues. The room acoustics of such an object were analyzed in the scope of the reverberation time and potential acoustic adaptation measures are indicated. Identification and classification of noise sources in training facilities and gyms was carried out based...

Vibrational behaviour of hydraulic power system elements is crucial in aspects of noise problems. Hydraulic lines used in engineering systems to transfer hydraulic energy are also a structural and fluid coupling between vibrating elements of the entire system. Excitation generated in different places of the hydraulic systems due to external loads,...

An innovative method utilizing the phenomenon of mechanical resonance in machine drive systems of impact machines has been described. Energy accumulated in mechanical resonance is typically multiple times larger than the continuously supplied excitation energy. The amount of accumulated energy depends on the amplitude of vibration, mass and stiffne...

The paper presents a methodology developed to reduce the noise emission in fluid power units. Investigations confirm that during the operation of fluid power units there are many coupled causes of noise generation. In order to propose changes aimed at reducing noise emission the location of sound sources, testing of dynamic properties of the mechan...

The paper presents results of research on the transmission of fluid borne noise in reservoir filled with fluid. This type of transmission of vibrational energy in the fluid occurs in fluid power units, in which hydraulic pumps are immersed in the liquid in the tank i.e. in the vertical mounting of the electric motor on the reservoir. There are vibr...

In this article the use of mechanical resonance in the drive systems of impact working machines will be discussed. The total mechanical energy and the vibration amplitude of the mass in an oscillator at resonance are increasing to certain values, which are dependent on damping. In steady state conditions at resonance, the delivered energy is equal...

In this article the use of mechanical resonance in the drive systems of impact working machines and in machines with crankshaft systems will be discussed. The total mechanical energy and the vibration amplitude of the mass in an oscillator at resonance are increasing to certain values, which are dependent on damping. In steady state conditions at r...

In this paper the effectiveness of two stage vibration isolation on example of a vibratory conveyor has been shown. Vibratory conveyors are used for separating the casting from the mold in foundries. In the considered case the shake-out conveyor has been supported directly on the foundation. Due to that the high amplitudes of vibrations on the foun...

This paper presents the resonance in mechanical systems in aspects of energy states. A single mass mechanical oscillator excited by a rotational mass, set on a cart attached to a spring system was described. A physical model of the oscillator was created and used in experiments. Parameters of the mechanical system were experimentally established on...