dr inż. Jarosław Błaszczak

Jarosław Błaszczak

dr inż.

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  • Affiliation at:
    I12
  • ORCID IDORCID ID:
    0000-0002-5174-5104

Consultations

  • Recurring consultations

    Day of week Start End Semester Place (building, room) Description
    Friday 11:15 13:00 2023/24 L B13, room 41 Every Friday, Building B13: room 41 + You can send me an e-mail anytime /////// Każdy piątek, Budynek B13: pokój 41 + Możliwość kontaktu poprzez wysłanie e-maila w dowolnym czasie
  • More about me

  • ResearcherID: B-1896-2013

    https://scholar.google.com/citations?user=tjcSvEsAAAAJ&hl=en


  • Publications

    2022

    FABRIC AS AN ACOUSTIC BARRIER

    Tests of fabrics with different weaves are presented.

    2021

    The Influence of Yarn and Weave Structures on Acoustic Materials and the Effect of Different Acoustic Signal Incidence Angles on Woven Fabric Absorption Possibilities

    Authors: Bethalihem Teferi Samuel, Marcin Barburski, Jaroslaw R Blaszczak, Ewa Witczak, Katarzyna Abramczyk
    Jouranl: Materials
    Volume 14, Issue 11, Pages 2814
    Publisher: Multidisciplinary Digital Publishing Institute
     
    Authors
    Bethalihem Teferi Samuel, Marcin Barburski, Jaroslaw R Blaszczak, Ewa Witczak, Katarzyna Abramczyk
    Publication date
    2021/1
    Journal
    Materials
    Volume
    14
    Issue
    11
    Pages
    2814
    Publisher
    Multidisciplinary Digital Publishing Institute
     
    Description:
    Utilizing textile-based acoustic materials can be considered basically from two points of view. First, it may be used as a sound absorbing material. Second, it may be used as a decoration that gives the surrounding area a new artistic appearance. To improve the acoustic possibilities of any woven fabric, it is necessary to study the influences of yarn characteristics and the internal structures of weave interlacement. To understand the impact of the yarn on the fabric, the samples were prepared using only polyester fiber as textured, twisted, and staple yarns. Regarding this experiment, the basic weave’s structure type, such as plain, rib, sateen, and twill, were used. Overall, 16 woven fabrics were prepared. The investigation was performed in the range of low to medium acoustic frequencies. The experiments were conducted in an anechoic chamber. Compared to other yarn types, fabrics formed from textured polyester yarn had higher sound absorption properties. Moreover, the observed results show that the different incidence angles of acoustic signals influence the measured sound absorption properties of a textile.
     

    2019

    Experimental Research of Noise Reduction Possibilities of an Axial Fan with an Additional Contra-Rotor

    https://pdfs.semanticscholar.org/2310/423fa8be7d150edf003fc80162e3591ed9a4.pdf

    This work refers to investigations of the noise propagation of a fan with an inlet contra-rotating rotor. The main goal was to find if there were regions of rotational frequency where the noise levels emitted by the system may be lower than expected. The measurements were performed at Lodz University of Technology in the aeroacoustic anechoic chamber. Constant rotational speed of the first rod-rotor was set-up as constant with varying rotational speed of the second rotor (the fan). The system was similar to one of the NASA earlier experiments. The analysis showed correlations between the emitted noise levels and the rotational speeds of the rotors. Next, the noise emitted only by the second rotor (the fan) was compared with the noise of two co-operating rotors. Some regions, where the noise of the fan was reduced due to the presence of the second contra-rotating rotor at the inlet, gave a base for future investigations. The issue is important especially in cases where quiet electric drives can be used and the aerodynamic noise is crucial. The presented results can be used in similar systems in modern flow machinery, aeroengines configurations, double-rotor drones, as well as, due to the simplicity of the system and its geometry, for verification of numerical methods.

    2018

    Influence of designs of weaves on acoustic attenuation of fabrics

     
     The results of acoustics tests of different structure woven fabrics are presented. The researches were performed in the aeroacoustic anechoic chamber. Ten fabrics were tested (four of them with honeycomb 3D design) to check their acoustic properties. The tests were conducted inside lower and medium acoustical frequency zones. The presented studies showed that all fabrics with honeycomb weaves had much less attenuation than other fabrics, mostly due to less dense structures at higher thicknesses and more open internal structures. Having analyzed the obtained results, some comments are shown and possibilities of using such woven structures are proposed.

    2016

    ACOUSTIC CHARACTERISTICS OF AN ANECHOIC CHAMBER WITH AN AXIAL TWO-STAGE LP MODEL TURBINE – COMPARATIVE STUDY

    CMP/Turbomachinery; Vol. 149, pp. 1-10

    Abstract: The main objective of this paper is to present experimental characteristics of an untypical aeroacoustic anechoic chamber especially built to investigate sounds accompanying flows in turbomachines. After having inserted an axial two-stage LP model turbine and after some years of exploitation the design parameters of the facility were checked again. The acoustic field inside the chamber was measured and its characteristics were compared with earlier results. All the experimental investigations were carried out in the Institute of Turbomachinery of the Lodz University of Technology, Poland.


    Keywords: aeroacoustics, laboratory, anechoic chamber, characteristics

    2016

    EXPERIMENTAL TESTS OF POSSIBILITIES OF NOISE REDUCTION OF DRONES

    CMP/TURBOMACHINERY; Vol.149; pp. 17-26

    Authors: Robert C.J. HELIARA, Daniel RUPP, Pascal O.J. van VERSEVELD, Mathilde VINCE, Jaroslaw R. BLASZCZAK

    Abstract: The paper presents the results of acoustic measurements concerning observation eight-propeller drone that, due to the load capacity, can also be used for transportation of large parcels. Due to its civil applications, mainly in large smart cities, the aim of this study is to look for opportunities to reduce emitted noise without significantly increasing its weight. The data were obtained during the measurement sessions in aeroacoustic anechoic chamber located at the Institute of Turbomachinery, Lodz University of Technology.

    Key words: aeroacoustics, drone, noise reduction, measurements

    2016

    Experimental Investigations of Acoustic Characteristics of Two Counter–Rotating Rotors

    Authors: Wojciech Rydlewicz, Jaroslaw R. Blaszczak
    Journal: Mechanics and Mechanical Engineering
    Volume 24, Issue 4, Pages 489–497
    Publisher: ISSN: 1428-1511
    http://repozytorium.p.lodz.pl/bitstream/handle/11652/1663/Experimental_investigations_acoustic_Rydlewicz_2016.pdf?sequence=1&isAllowed=y
     
    Description
    The presented investigations are continuation of earlier researches performed in the Institute of Turbomachinery (Lodz University of Technology, Poland). The main aim of this paper is to investigate the acoustics properties of the chosen configuration of a flow set–up consisting of two coaxial counter–rotating rotors. Description and analysis of measurements are presented. As a consequence, conclusions about possibility of noise reduction of such a system are presented. According to the EU Directives, the main areas of application are multi–purpose helicopters with two coaxial counter–rotating rotors, drones and future passenger–aircrafts with next–generation aeroengines.

    2016

    Aeroacoustic Measurements of Noise Generated by a Rotor for Selected Exploitation Conditions

    Authors: Lukasz Kosek, Maciej Karczewski, Piotr Wiklak, Jaroslaw R. Blaszczak
    Journal: Turbomachinery
    Volume: 149; Pages 27-36
     

    Abstract: The paper presents measurements results of acoustic investigations of a helicopter rotor model. Its aim was to provide the data analysis allowing for identification of noise sources and propose solutions for noise reduction. The data were obtained during test sessions using a free-field measurement system. The researches were conducted inside an aeroacoustic anechoic chamber at the Institute of Turbomachinery, Lodz University of Technology.

    Keywords: aeroacoustics, rotor, noise analysis, measurements

    2023

    Improving Smart Eco Cities According to Sustainable Development Proposed by the UN and EU Regulations

    G Król, G Garcia, J Álvarez, T Melo, JR Blaszczak

    International Faculty of Engineering,, Lodz University of Technology

    The concept of Smart Eco Cities has gained significant attention in recent years, as nations worldwide strive to achieve sustainable development goals and enhance the quality of life for their citizens. This report delves into the multifaceted aspects of Smart Eco Cities (SEC), focusing on their alignment with the Agenda 2030, the measurement of smartness and sustainability, and the crucial decision of adapting existing cities versus building new ones. Furthermore, the report explores the potential of rebuilding Ukraine in line with SEC principles.

    By examining various dimensions, including technology, infrastructure, and governance, the report provides general recommendations and guidelines for the development of these cities. It emphasizes the importance of comprehensive planning, stakeholder engagement, and the integration of innovative solutions to build resilient, inclusive, and environmentally-friendly cities. With the ultimate aim of improving the well-being of habitants and safeguarding the planet, this report serves as a valuable resource for policymakers, urban planners, and researchers invested in creating a sustainable and smart future for our cities.


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      Monday, 18 August 2014, 3:27 PM (9 years 224 days)
    • Last access to site
      Tuesday, 24 October 2023, 3:54 PM (155 days 20 hours)