<p>Hydraulic systems have many applications in the construction, transportation, and manufacturing sectors. Recent design trends involve systems with higher working pressures and more compact systems, which are advantageous because of power density increase. However, these trends imply higher forces and larger vibration amplitudes while having lesser mass and damping, leading to higher noise levels. Meanwhile, hydraulic machinery started prospecting new applications with tighter noise regulations, a trend which was also pushed by the electrification tendency in several fields of transportation and agriculture. One method to attain noise mitigation is passive-noise canceling techniques have the advantage of not introducing energy to the system. This approach arranges pressure ripple waves in a destructive pattern by projecting a hydraulic circuit's geometry, configuration, and features.</p> <p> </p> <p>This dissertation aims to predict fluid-borne noise sources and investigate passive noise-canceling solutions for multiple operations conditions targeting to impact many hydraulic systems and a broad range of operating conditions. Primarily a coupled system model strategy that includes a one-dimensional line finite element model is developed. The line model predicts pressure wave generation and propagation. The model features versatility since parameters like line diameter and material can be discretized node by node. Simulations are compared to measured data in a realistic novel hydraulic hybrid transmission for validation. </p> <p> </p> <p>Subsequently, an extensive numerical investigation is performed by setting fixed parameters along the hydraulic lines' length and comparing several isolated geometric properties in simulation. The developed line model is also used to study the influence of line features such as diameter and extent of the conduit. Cost-effective and simple passive solution solutions such as Quincke tubes (parallel lines), expansion chambers, and closed branches are selected and investigated on simulation. Four target pressure ripples are chosen as indicators for summarizing passive line elements behavior. The frequency-domain behavior of the pressure ripple peaks regarding the line's length is identified and isolated in simulation at the 50-5000Hz frequency spectrum. An experiment test rig is designed to implement these solutions and the experiments show three developed passive elements as practical and effective solutions for reducing fluid borne noise sources. The selected designs yielded noise source attenuation over most of the frequency spectrum measured with piezoelectric pressure variation sensors and accelerometers in different positions in the hydraulic circuit. Sound pressure measurements detected reductions over 3dB in the best cases. </p> <p> </p> <p>Also, a passive interference approach based on the principle of secondary source flow ripple cancellation was conceptualized, modeled, and implemented in a tandem axial-piston unit. The strategy consists of setting the phase between the two synchronous units to accomplish destructive interference in targeted unit harmonics. Two indexing strategies are investigated first analytically and then on simulation. One of the indexing strategies was implemented in a pre-existent commercial axial-piston tandem unit. Experiment results confirmed effectiveness for the first and third unit’s harmonics, where reductions over 15dB on pressure ripple were measured.</p> <p> </p> <p>Finally, a fluid-structure interaction based on the poison coupling principle is developed using the method of characteristics. Transfer functions of the pipeline accelerations versus the pressure ripples on lines calculated on simulation and later obtained experimentally to highlight ta critical vibration band from 2000Hz to 3000Hz with high acceleration response.</p> <p> </p><br>

La Escuela Superior de Artes Escénicas en Trujillo, comprendida en el marco de Educación y Cultura, toma el rol formativo profesional de artistas locales mediante espacios enfocados en el aprendizaje activo, la experimentación y el enfrentamiento con el público. Ubicado en el distrito de Víctor Larco Herrera, refuerza la presencia del arte en el sector educativo, promoviendo y rescatando la identidad colectiva como forma de comprensión del entorno sociocultural actual. Se enfoca en jóvenes de 14 a 25 años como principales postulantes, además de docentes y profesionales en el rubro. Propone como objetivo principal garantizar el Aprendizaje Experimental, generando un estímulo en el artista a través del su entorno construido, logrado mediante estrategias referidas a la disciplina de la NeuroArquitectura. De esta manera, términos como la Flexibilidad y la Acústica Arquitectónica, toman relevancia dentro del proyecto al plantear recintos que, mediante sus características específicas, representen un respaldo cognitivo como parte del desarrollo integral. El propósito del documento, remite a esta idea como principal punto de indagación, considerándose un método de innovación dentro de un marco nacional que lo requiere. / The Performing Arts Superior School in Trujillo, within the framework of Education and Culture, takes the professional training role of local artists through spaces focused on active learning, experimentation and confrontation with the public. Located in the Víctor Larco Herrera district, it reinforces the presence of art in the educational sector, promoting and rescuing collective identity as a way of understanding the current sociocultural environment. It focuses on young people between the ages of 14 and 25 as the main applicants, as well as teachers and professionals in the field. Its main objective is to guarantee Experimental Learning, generating a stimulus in the artist through his built environment, achieved through strategies related to the discipline of NeuroArchitecture. In this way, terms such as Flexibility and Architectural Acoustics take on relevance within the project by proposing enclosures that, through their specific characteristics, represent cognitive support as part of comprehensive development. The purpose of the document refers to this idea as the main point of inquiry, considering it an innovation method within a national framework that requires it. / Trabajo de investigación

<p>Despite the increasing demand for the hydraulic pump noise reduction, there is yet to be an established straightforward solution to reduce noise emissions. This is primarily due to a lack of understanding of the complete mechanism underlying noise generation and propagation, which involves complex interactions between three domains. Study of the physical phenomena of the hydraulic pump noise is typically separated into three categories, namely fluid-borne noise (FBN), structure-borne noise (SBN), and air-borne noise (ABN). In this light, this study examines the noise generation and propagation of hydraulic pumps in all three domains numerically and experimentally, taking external gear pumps (EGPs) as a reference. </p> <p>In conventional pump noise studies, the outlet pressure ripple in the fluid domain, which typically refers to has been the key focus to minimize, and FBN typically refers to the outlet pressure ripple. Fortunately, attempts to minimize ripples have resulted in some promising solutions that are now on the market (e.g., dual-flank gear pumps). However, since the noise generated by gear pumps involves several other significant and coherent noise sources, this approach has some limitations. In view of this, the current study describes FBN in a wider context to include all potential noise sources in the fluid domain, and their mutual effects on noise are investigated.</p> <p>Another aspect of the vibration and noise of the pump that is not often investigated is its “field” behaviors. Many significant works in vibroacoustic analysis or noise solutions rely on the simple measurements of acceleration or sound pressure at a single or few local points. Since vibration and noise are functions of not only time but also "space", this practice has also served as one of the obstacles to a comprehensive understanding of noise generation. Therefore, this study contributes to topic of the vibroacoustic field behaviors.</p> <p>Furthermore, when prototyping or designing new pumps, inefficient trial-and-error methods are often used, and it demonstrates the necessity of the acoustic model of the pumps for virtual prototyping. The major limiting factor towards the development of this type of models is high computational costs. Another technical challenge is that most of vibroacoustic analysis commercial software usually requires the user’s manual works for the simulation setup. In this regard, another aim of this study is to develop a computationally inexpensive and automated acoustic model that does not need manual inputs of users, so that the model can be used as a virtual prototyping tool with various design parameters.</p> <p>To sum up, the primary goal of this research is to numerically and experimentally investigate the vibroacoustic field behaviors and formulate the acoustic model to be used as a virtual prototyping tool with the experimental validation. To achieve these objectives, this research employs the well-established computational and experimental methods of vibro-acoustic analysis.</p> <p>The analysis of FBN makes use of the HYGESim tool, which has been developed to study EGMs at Maha Fluid Power Research Center. This tool solves the main flow based on the lumped parameter approach in conjunction with different solution schemes for lubricating interfaces and body dynamics. From the HYGESim results, all potential noise sources within the working fluid, such as inlet and outlet pressure ripple and dynamic pressure at the tooth space volumes, hydrodynamic journal bearings, and the lateral lubricating interface, are properly mapped to the structure using appropriate simplifications. </p> <p>When it comes to SBN, the modal superposition approach is exploited for the fast prediction of vibration fields. Therefore, considerable efforts are expended both numerically and experimentally to obtain accurate modal information. Particular attention is paid to the modeling of the mechanical connections between components and modeling of constraints in numerical modal analysis using the finite element method (FEM). Moreover, the vibration mode shapes are categorized according to the dominant motions that the pump body exhibits. Then, two different approaches, namely the full numerical model and the hybrid model, are introduced for the estimation of the vibration field during the operation; for the modal expansion, the former uses numerical modal information, while the latter uses experimentally determined modal information. Finally, the numerical model results are compared to the operational deflection shape (ODS) measured during pump operation, and a good agreement is observed.</p> <p>For the ABN prediction, the boundary element method (BEM) is used by taking the predicted vibration information as an input. The BEM solver development is elaborated to numerically replicate the acoustic environments where the noise measurement is conducted. With the developed BEM solver, two units that have the different gear and groove designs that fit into the same casing are tested, and as the key outcome, their sound power level, sound power spectrum, sound pressure distributions are presented. For model validation, the noise measurements are performed according to the ISO standard in the semi-anechoic chamber at Maha using a custom-designed robot arm. These validations demonstrate the ability of the developed model to predict the overall sound power levels with an averaged error of 1.87 dB and capture the general trends of measured sound power spectrum and sound pressure level distribution under various operating conditions. Furthermore, the developed model provides the reasonably fast computation time.</p> <p>Finally, using the developed acoustic model, a parametric study is performed with the backflow groove as a design variable. It is discussed how the volumetric efficiency and noise performance vary with the design changes, which demonstrates the model potential as a virtual prototyping tool.</p>

<p> The tire air cavity mode is known to be a significant source of vehicle structure-borne road noise near 200 Hz. A porous lining placed on the inner surface of a tire is an effective countermeasure to attenuate that resonance. The two noticeable effects of such a lining are the reduction in frequency and the attenuation of the air cavity mode. In this thesis, through both theoretical and numerical analysis, the mechanism of the effects of a porous lining was studied. A two-dimensional duct-shaped theoretical model and a torus-shaped numerical model were built to investigate the lined tire in conjunction with the Johnson-Champoux-Allard model describing the viscous and thermal dissipative effects of the porous material. Design parameters of the porous lining were varied to study their impact and optimal ranges of the design parameters were identified. Finally, in an experimental analysis, the sound attenuation and the frequency drop were observed in measurements of force, acceleration, and sound pressure. In conclusion, it was demonstrated that the suggested theoretical and numerical models successfully predict the effects of porous linings and that the frequency reduction results from the decreased sound speed within the tire owing to the presence of the liner. </p>

<p dir="ltr">The industry's interest in electrified powertrain-equipped vehicles has increased due to environmental and economic reasons. Electrified powertrains, in general, produce lower sound and vibration level than those equipped with internal combustion engines, making noise and vibration (N&V) from other non-engine powertrain components more perceptible. One such N&V type that arouses concern to both vehicle manufacturers and passengers is gear growl, but the signal characteristics of gear growl noise and vibration and the threshold of those characteristics that can be used to determine whether a gear growl requires attention are not yet well understood. This study focuses on developing a method to detect gear-growl based on the N\&V measurements and determining thresholds on various severities of gear-growl using supervised machine learning classification. In general, a machine learning classifier requires sufficient high-quality training data with strong information independence to ensure accurate classification performance. In industrial practices, acquiring high-quality vehicle NVH data is expensive in terms of finance, time, and effort. A physically informed data augmentation method is, thus, proposed to generate realistic powertrain NVH signals based on high-quality measurements which not only provides a larger training data set but also enriches the signal feature variations included in the data set. More specifically, this method extracts physical information such as angular speed, tonal amplitudes distribution, and broadband spectrum shape from the measurement data. Then, it recreates a synthetic signal that mimics the measurement data. The measured and simulated (via data augmentation) are transformed into feature matrix representation so that the N\&V signals can be used in the classification model training process. Features describing signal characteristics are studied, extracted, and selected. While the root-mean-square (RMS) of the vibration signal and spectral entropy were sufficient for detecting gear-growl with a test accuracy of 0.9828, the acoustic signal required more features due to background noise, making data linearly inseparable. The minimum Redundancy Maximum Relevance (mRMR) feature scoring method was used to assess the importance of acoustic signal features in classification. The five most important features based on the importance score were the angular acceleration of the driveshaft, the time derivative of RMS, the tone-to-noise ratio (TNR), the time derivative of the spectral spread of the tonal component of the acoustic signal, and the time derivative of the spectral spread of the original acoustic signal (before tonal and broadband separation). A supervised classification model is developed using a support vector machine from the extracted acoustic signal features. Data used in training and testing consists of steady-state vehicle operations of 25, 35, 45, and 55 mph, with two vehicles with two different powertrain specs: axles with 4.56 and 6.14 gear ratios. The dataset includes powertrains with swapped axles (four different configurations). Techniques such as cost weighting, median filter, and hyperparameter tuning are implemented to improve the classification performance where the model classifies if a segment in the signal represents a gear-growl event or no gear-growl event. The average accuracy of test data was 0.918. A multi-class classification model is further implemented to classify different severities based on preliminary subjective listening studies. Data augmentation using signal simulation showed improvement in binary classification applications. In this study, only gear-growl was used as a fault type. Still, data augmentation, feature extraction and selection, and classification methods can be generalized for NVH signal-based fault diagnosis applications. Further listening studies are suggested for improved classification of multi-class classification applications.</p>

<p dir="ltr">In the field of noise control engineering, the development of effective low-frequency sound absorption treatments has long been a challenge, since conventional solutions tend to require impractically thick layers of traditional porous materials, such as fibrous materials and foams. In contrast, high surface area particles, such as granular activated carbon (GAC) particles, milled aerogels, and zeolites, have inner-particle pores at micro and nano scales, which improve the low-frequency absorption by slowing the local sound speed. As a result, a 30 mm thick GAC stack can achieve an absorption coefficient of 0.3 at 100 Hz. Hence, these materials have already been used in various low-frequency applications in place of fibrous or foam layers: e.g., MEMS speaker back cavities, Helmholtz resonator liners, micro-perforated panel absorbers, and membrane absorbers. One major practical goal of this research was to determine how best to model and optimize novel treatments consisting in whole or in part of high surface area granular materials. </p><p dir="ltr">The detailed work presented in this thesis starts with a review of acoustical models of various material types, followed by two approaches to modeling and coupling different types of layers in a general and stable manner. In particular, in the second approach, a large, complicated system is divided into a series of small systems, hence avoiding the direct inverse solution of large systems. As a result, the second approach is more efficient and enables computationally intensive tasks such as multi-layer material characterization and sound package optimization. In addition to the modeling techniques, different types of granular stacks’ acoustical behavior were also experimentally investigated and summarized: i.e., 1. the edge-constraint effect resulting from the friction at the wall of the impedance tube; 2. level-dependent behavior; 3. time-dependent behavior; and 4. other non-linear behavior. To capture the observed acoustical physics of GAC stacks, a triple-porosity poro-elastic model with a depth-dependent modulus was described, followed by characterization frameworks to model the stacks subject to the edge-constraint effect as well as varying excitation levels. These frameworks were validated by comparing the absorption spectra predicted by using the inferred material properties with impedance tube measurements of GAC stacks with varying depths, diameters, and exposure levels. In the end, a novel sound absorption treatment was presented (a GAC stack supported by a soft, porous layer), which was subsequently optimized to develop broadband absorbers.</p>

[ES] Los recintos de culto son construcciones patrimoniales de importantes valores culturales, históricos, artísticos y arquitectónicos. Además, presentan una sonoridad característica que debe ser objeto de especial protección. En este sentido, la Organización de las Naciones Unidas para la Educación, la Ciencia y la Cultura (UNESCO) ha reconocido el sonido de los recintos de culto como una parte importante de nuestro patrimonio cultural inmaterial, estableciendo como prioridad su preservación. En este ámbito, la acústica virtual se presenta como una herramienta muy eficaz para el estudio del patrimonio sonoro de los recintos de culto. A través de simulaciones acústicas, es posible analizar en detalle el comportamiento acústico de los diferentes espacios y estudiar la evolución sonora de los templos. La acústica virtual permite predecir y percibir el resultado acústico de cualquier propuesta de intervención antes de su realización práctica, con lo que se presenta una nueva variable a tener en cuenta a la hora de afrontar la restauración del patrimonio: la acústica arquitectónica. Asimismo, la simulación acústica y visual ofrece la posibilidad de realizar turismo virtual por los recintos de culto, fomentando el estudio y disfrute de sus valores patrimoniales. Con todo ello, en esta investigación se ha aplicado la acústica virtual en el estudio del patrimonio sonoro, tanto interior como exterior, de la Catedral de Valencia. / [CA] Els recintes de culte són construccions patrimonials d'importants valors culturals, històrics, artístics i arquitectònics. A més, presenten una sonoritat característica que ha de ser objecte d'especial protecció. En aquest sentit, l'Organització de les Nacions Unides per a l'Educació, la Ciència i la Cultura (UNESCO) ha reconegut el so dels recintes de culte com una part important del nostre patrimoni cultural immaterial, establint com a prioritat la seua preservació. En aquest àmbit, l'acústica virtual es presenta com una eina molt eficaç per a l'estudi del patrimoni sonor dels recintes de culte. A través de simulacions acústiques, és possible analitzar detalladament el comportament acústic dels diferents espais i estudiar l'evolució sonora dels temples. L'acústica virtual permet predir i percebre el resultat acústic de qualsevol proposta d'intervenció abans de la seua realització pràctica, amb el que es presenta una nova variable a tindre en compte a l'hora d'afrontar la restauració del patrimoni: l'acústica arquitectònica. Així mateix, la simulació acústica i visual ofereix la possibilitat de realitzar turisme virtual pels recintes de culte, fomentant l'estudi i gaudi dels seus valors patrimonials. Amb tot això, en aquesta investigació s'ha aplicat l'acústica virtual en l'estudi del patrimoni sonor, tant interior com exterior, de la Catedral de València. / [EN] Places of worship are patrimonial constructions of important cultural, historical, artistic and architectural values. In addition, they have a characteristic sound that must be the object of special protection. In this sense, the United Nations Educational, Scientific and Cultural Organization (UNESCO) has recognized the sound of places of worship as an important part of our intangible cultural heritage, establishing its preservation as a priority. In this field, virtual acoustics is presented as a very effective tool for studying the sound heritage of places of worship. Through acoustic simulations, it is possible to analyze in detail the acoustic behavior of different spaces and study the sound evolution of temples. Virtual acoustics makes possible to predict and perceive the acoustic result of any intervention proposal before its practical implementation, thus presenting a new variable to consider when dealing with heritage restoration: architectural acoustics. Likewise, acoustic and visual simulation offers the possibility of carrying out virtual tourism around places of worship, promoting the study and enjoyment of their heritage values. With all this, in this research virtual acoustics has been applied in the study of the sound heritage, both inside and outside, of the Cathedral of Valencia. / Gracias al Ministerio de Ciencia e Innovación por los proyectos de investigación BIA2012-36896 y BIA2016-76957-C3-3-R en los que se enmarca este trabajo. / Díaz Rubio, E. (2023). La acústica virtual como herramienta para el estudio del patrimonio arquitectónico. Aplicación en la Catedral de Valencia [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/193837

<div> <div> <div> <p>Speech quality is a demand in voice commanded systems and in telephony. The voice communication system in real time often suffers from audible echoes. In order to cancel echoes, an acoustic echo cancellation system is designed and applied to increase speech quality both subjectively and objectively. </p> <p>In this research we develop various nonlinear adaptive filters wielding the new channel sparsity-aware recursive least squares (RLS) algorithms using a sequential update. The developed nonlinear adaptive filters using the sparse sequential RLS (S-SEQ-RLS) algorithm apply a discard function to disregard the coefficients which are not significant or close to zero in the weight vector for each channel in order to reduce the computational load and improve the algorithm convergence rate. The channel sparsity-aware algorithm is first derived for nonlinear system modeling or system identification, and then modified for application of echo cancellation. Simulation results demonstrate that by selecting a proper threshold value in the discard function, the proposed nonlinear adaptive filters using the RLS (S-SEQ-RLS) algorithm can achieve the similar performance as the nonlinear filters using the sequential RLS (SEQ-RLS) algorithm in which the channel weight vectors are sequentially updated. Furthermore, the proposed channel sparsity-aware RLS algorithms require a lower computational load in comparison with the non-sequential and non-sparsity algorithms. The computational load for the sparse algorithms can further be reduced by using data-selective strategies. </p> </div> </div> </div>

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Neste trabalho se revisam os principais aperfeiçoamentos implementados no código computacional de simulação numérica de acústica de salas denominado RAIOS. Tais aperfeiçoamentos são divididos em quatro grupos: processo de importação de informação a partir de arquivos DXF; a implementação de novos parâmetros de qualidade acústica, assim como o cálculo do nível de pressão sonora; modificações para lidar com casos de acústica de exteriores (ruído urbano) e por último; inserção do módulo de realidade virtual acústica. Inicialmente, é apresentada uma breve revisão do estado anterior do código computacional RAIOS e, em seguida, os modelos que foram implementados no software. Os resultados obtidos foram precisos e os erros apresentados são justificados através da análise das características dos modelos e métodos adotados pelo simulador. / In this work, the most important improvements implemented in the computer code of numeric simulation of room acoustics, called RAIOS, are presented. These improvements are divided in four groups: Data importation process from DXF files; implementation of new acoustic quality parameters and steady state sound pressure level calculation; modifications in order to deal with cases of open field acoustics (urban noise); and implementation of the acoustic virtual reality module. Initially, a brief overview of the previous version of the computer code RAIOS is done. Then, the background theory of the procedures performed in the source code are presented. The results obtained were accurate and the encountered errors are justified through the characteristics analysis of the models and methods adopted by the simulator.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In July, 2013, Brazil s new standard, NBR15575:2013, began to require minimum thermal, luminal, structural and acoustical performance levels in new constructions of residential dwellings. Thus, computer programs that simulate the sound transmission in buildings, can serve as important tools for professionals, enabling the verification of virtual acoustic performance of projects, quickly and economically. By being widely used in European countries, they have the database of existing elements and building systems in Europe. From this, this study aimed to evaluate a computational tool of simulation of sound transmission on the reality of Brazilian buildings. Twenty households were selected in the city of Santa Maria - RS, to be measured in situ and then simulated to airborne and impact noise. The residences were chosen according to standard and types of building systems. For greater representation of Brazilian buildings, residences of low, medium and high standards were chosen. The building systems chosen were structural masonry, structural walls with concrete or ceramic block; and reinforced concrete, with walls of hollow brick; all with massive concrete slab. The software used for the simulations was the SONarchitect and all the features and building elements used were entered into the software s database. The values of Lœn,T , Dn,T , and RT per frequency band, and their weighted values Lœn,T,w, Dn,T,w and mean RT were obtained through measurements and simulation. The weighted measured and simulated values were similar, on the other hand, the values obtained by frequency band showed disagreement with the lower frequencies precisely, from 50 Hz to 100 Hz. There was also a relationship of impact sound transmission loss with the area size of the partition, in which there is a significant increase in sound insulation in partitions with larger areas. In addition, coefficients and safety factors were determined for each standard and building system to be applied in the spectra of the simulations, aiming to bring the simulated values closer to the measured ones. Parallel with the evaluation of the computational tool, questionnaires with 150 professionals who develop acoustic projects in the country were applied. This step had as main objective to find out what tools and methods are mostly used by professionals in the development of these projects. From 31 received responses, it was determined that 20.88% of the professionals use a computational tool to develop designs. It was also possible to discover some features such as field of expertise and graduation year, which regions they are located, what kind of projects they develop and if they have already developed projects based on the new standard. / Com a entrada em vigor, em julho de 2013, da nova norma brasileira, NBR 15575:2013, passaram a ser exigidos nas novas construções de uso multifamiliar, níveis mínimos de desempenho, tais como térmico, ilumínico, estrutural e acústico. Dessa maneira, programas computacionais que simulam a transmissão sonora em edificações, podem servir como ferramentas importantes aos profissionais, permitindo a verificação do desempenho acústico virtual dos projetos, de forma rápida e econômica. Por serem amplamente utilizados nos países europeus, possuem banco de dados dos elementos e sistemas construtivos existentes na Europa. A partir disso, esse trabalho teve como objetivo a avaliação de uma ferramenta computacional, de simulação da transmissão sonora, para a realidade das construções brasileiras. Foram selecionadas 20 residências, na cidade de Santa Maria - RS, para serem medidas in loco e depois simuladas, aos ruídos aéreo e de impacto. As residências foram escolhidas, de acordo com padrão e sistemas construtivos. Para maior representatividade das construções brasileiras, foram escolhidas residências do padrão baixo, médio e alto. Os sistemas construtivos escolhidos foram alvenaria estrutural, com paredes de bloco estrutural de concreto ou cerâmico; e concreto armado, com paredes de tijolo vazado; todos com laje maciça de concreto. O programa utilizado para as simulações foi o SONarchitect e todas as características, dos elementos construtivos utilizados, foram inseridos no banco de dados do software. Foram obtidos os valores de Lœn,T , Dn,T,, e TR por banda de frequência, e seus valores ponderados de Lœn,T,w, Dn,T,w e TR médio, nas medições e simulações. Os valores ponderados medidos e simulados foram similares, por outro lado os valores obtidos por banda de frequência apresentaram divergência em relação às frequências mais baixas, precisamente de 50 Hz a 100 Hz. Verificou-se também uma relação da perda de transmissão sonora ao ruído de impacto com o tamanho da área da partição, na qual ocorre um aumento significativo no isolamento sonoro em partições com áreas maiores. Além disso, foram determinados coeficientes e fatores de segurança, para cada padrão e sistema construtivo, a serem aplicados nos espectros das simulações. Com o objetivo de aproximar os valores simulados dos valores medidos. Paralelamente à avaliação da ferramenta computacional, foram aplicados questionários com 150 profissionais que desenvolvem projetos acústicos no país. Essa etapa tinha como objetivo principal descobrir quais ferramentas e métodos são mais utilizados pelos profissionais no desenvolvimento desses projetos. A partir de 31 questionários respondidos, foi possível determinar que 20,88% dos profissionais utilizam alguma ferramenta computacional para desenvolver os projetos. Também foi possível descobrir algumas características desses profissionais como curso e ano de formação, quais as regiões que estão inseridos, que tipo de projetos desenvolvem e se já desenvolveram projetos baseados na nova norma.