A5054735190- Acoustic Wave Phenomena Research
- Material Properties and Processing
- Structural Health Monitoring Techniques
- Advanced Cellulose Research Studies
- Wood Treatment and Properties
- Vehicle Noise and Vibration Control
- Tree Root and Stability Studies
- Composite Structure Analysis and Optimization
- Textile materials and evaluations
- Structural Response to Dynamic Loads
- Epoxy Resin Curing Processes
- Bamboo properties and applications
- Structural Analysis of Composite Materials
- Vibration and Dynamic Analysis
- Vehicle Dynamics and Control Systems
- Advanced machining processes and optimization
- Structural Engineering and Vibration Analysis
- Mechanical Behavior of Composites
- Manufacturing Process and Optimization
- Aerodynamics and Acoustics in Jet Flows
- Laser and Thermal Forming Techniques
- Music Technology and Sound Studies
- Nanocomposite Films for Food Packaging
- Transportation Safety and Impact Analysis
- biodegradable polymer synthesis and properties
Transylvania University of Brașov
2016-2025
The purpose of the study was to analyze influence quality class and orthotropy wood upon sound absorption coefficient, reflection impedance ratio two species widely used for stringed musical instruments, namely spruce (Picea abies L. Karst) maple (Acer pseudoplatanus L.). An tube frequency range 100–6400 Hz in these experimental determinations. Knowing porosity tortuosity on acoustic absorption, properties were also determined, as well reduction coefficient maximum values coefficients...
Abstract The study investigates the effect of type varnish and number layers on some acoustic properties resonance spruce in combination with changes produced physical, morphological, chemical wood. In addition to color surface chemistry, roughness morphology are modified by thickness film, 10 being optimal from this point view, as well oil‐based finish. sound absorption coefficient increases varies frequency range, type, wood quality, all contributing tunability. For example, for a 1.5 kHz,...
The study presented in this paper investigates the influence of coating polymers on acoustic properties resonant spruce wood. It evaluates absorption, reflection, and resonance frequency spectrum characteristics both unvarnished varnished samples, with interface between polymer wood modifying response. novelty research consists evaluating dynamic parameters boards, varnishes different chemical (oil-based varnish, spirit nitrocellulose varnish). focuses type varnish thickness film spectrum,...
An optimization method of the vibrating horns is presented considering smallest action principle and attached cutting tool mass. The model based on Webster’s wave propagation equation as an objective function minimization volume in structural equilibrium conditions was considered. considered input parameters were working frequency, maximum cross-sectional area, magnification coefficient, At end study, a new shape horn’s cross section obtained. particularity obtained given by nodal point...
The paper aims to present an experimental study on low velocity impact behavior of composite materials reinforced with carbon fibers. objectives investigations are assess the main characteristics response such as energy absorbed by laminate plate, contact force well indentation corresponding different initial kinetic energies projectile. tests were conducted rectangular plate specimens dimensions 150x100x2.5mm3, cut off from a symmetric made 8 unidirectional carbon/epoxy vinyl ester that...
The food packaging characteristics and environmental impact of paper coated with polysaccharide dispersions were analyzed. Colloidal xylan derivatives, as well their combinations chitosan nanocrystalline cellulose, applied in thin layers on both sides the surface (5 g/m²). barrier properties to water, water vapor, gases, oil/grease, antimicrobial evaluated. Generally, coatings improved features papers compared uncoated paper. Significant improvements obtained by combining derivatives...
Cellulose-based foams present a high potential for noise insulation applications. These materials are bio-degradable, eco-friendly by both embedded components and manufacturing process, have low density porosity, able to provide good characteristics compared with available petroleum-based currently used on large scale. This paper presents the results of some investigations performed authors in order improve functional terms free surface wettability structural integrity. Native xylan...