|
|
Influence of eardrum perforation position and eardrum perforation size on ear sound transfer function
Straka, Martin ; Dušek, Daniel (referee) ; Pellant, Karel (advisor)
This thesis describes influence of eardrum perforation and perforation patching (myringoplastics) on sound transfer function. Perforation size, perforation position and inluence of graft material on hearing are discussed. This thesis is completed with 3D mathematical modeling in ANSYS system. The 3D finite element model of human ear is remodeled to represent the perforated and graft covered stage. Mathematical modeling is used for sound transfer calculations and for the discussions of the influence of tympanic membrane perforation on hearing. Set of audiological examination is processed and it is made the comparison between mathematical modeling results and audiology results.
|
|
|
Infuence of eardrum position on sound transmission
Krbálek, Jaroslav ; Dušek, Daniel (referee) ; Pellant, Karel (advisor)
The human eardrum is inclined at an angle of 50 ° t o the axis of external auditory canal. The main objective of this thesis was to determine the impact of the inclination on sound transmission characteristics of external ear canal. It was observed influence of the various features of the eardrum and of the malleus weight on calculated transmission characteristics. Simple finite element model (FEM model) was created in the ANSYS program. The acoustic subsystem of the outer ear tube, elastic eardrum and solid malleus were created. The external ear canal model was modeled as one sided open cylinder which was terminated diagonally bedded with eardrum. In addition to the impact of the eardrum inclination, the influence of the eardrum elasticity and the weight of malleus on the sound transmission characteristics of external ear canal was also monitored. The eventual presence of the coincidence effect was also studied.
|
|
|
Vibration Propagation Analysis of Coupled Structure Acoustic Space
Kostelník, Jan ; Pellant, Karel (referee) ; Novotný, Pavel (advisor)
The aim of this Master’s thesis Vibration Propagation Analysis of Coupled Structure Acoustic Space is to analyze vibration propagation in combustion engine, from combustion space through solid structure to fluid surroundings. Then analyze the noise increase as pressure changing in fluid space around the solid structure. There was made a analyze of single piston engine in different frequency and piston location. A simulation of distribution of a pressure waves was made in an ANSYS application.
|
|
| |
|
|
Design of phosphate fertilizer mixer
Adamčík, Martin ; Svěrák, Tomáš (referee) ; Pellant, Karel (advisor)
Diplomová práca sa zaoberá návrhom mixéru pre výrobu fosfátových hnojív s ohľadom na zadané požiadavky. Práca samotná je rozdelená do niekoľkých častí, kde prvá formuluje ciele riešenia. Základné otázky konkrétneho priemyslu sú odpovedané s akcentom na premenné, ktoré priamo ovplyvňujú kvalitu mixovania. Ďalšia časť práce prezentuje ideový návrh so sadou výpočtov, ktoré podporujú požadovaný výkon a mechanický dizajn mixéru. Hriadeľ je kontrolovaný analytickým výpočtom a metódou FEM, vyúsťujúc do zhodných záverov. Navrhnutý dizajn mixéru je prezentovaný 3D modelmi jeho súčastí, ktoré boli vytvorené v prostredí Autodesk Inventor. Práca obsahuje taktiež 2D dokumentáciu.
|
|
|
Influence of exostoses on hearing
Vališová, Šárka ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
Exostoses are periosteophyte inside the external auditory canal of the human ear. The main objective of this bachelor´s thesis is to determine the potencial impact of the shape modification of the external auditory canal due to occurence of exostoses on the mechanical sound transmission into the internal ear. The task was solved by FEM modelling performed in the ANSYS system. The simple finite element 2D model of the normal human ear has been taken from the diploma thesis B. Ouali: Development of 2D finite element model of human ear (BUT Brno, 2009), the model included the external ear canal, elastic eardrum, otitis cavity with the otitis ossicles and the cavity of the internal ear. The changes simulating exostoses in form of two opposite semicircles were performed. The different size and position of the symmetrical exostoses were studied. The influence of the exostoses on the sound transfer characteristics of the external ear canal was discused. It was processed the set of the audiograms (19 patients). The results of the modelling and the results of the audiology were compared, the preoperativ and the postoperativ stages were considered.
|
|
| |
|
| |
|
|
Digital modeling of the orchestra sound
Puczok, Daniel ; Pellant, Karel (referee) ; Doložílek, Miroslav (advisor)
This report is guide along simulation of sound sources and orchestra. Basic physical characteristics necessary to the simulation of sound sources are described here. Description of the creation of directivity files in ODEON and theirs conversion from CATT-Acoustic to ODEON are described here too. Acquired directivity files were used for simulation of orchestra and for testing the directivity characteristics to room acoustics parameters.
|
|
|
Noise control of computers-application of optimal sound isolation layers and fun rotation speed
Kunovský, Martin ; Mišun, Vojtěch (referee) ; Pellant, Karel (advisor)
This thesis deals with the distribution of noise in the computer case and radiation into the neighborhood. Influence of geometrical shape and size of the computer case on radiated noise from the computer was investigated as well as effect of placement of the fan. Reducing noise by using sound absorbing material into computer case and result of the suitable position of the computer in the working environment were also tested. Simulation of the noise diffusion and effectivity of anti-noise equipment was executed in Ansys FEM program.
|
guest ::
