No description available.

This paper deals with design of tool deflection compensation system for milling spindle C1, provided by company TOSHULIN, a.s. A simplified simulation model of the spindle supplemented by compensatory elements was built by using programs ANSYS, MD ADAMS, Matlab/Simulink. As action elements there were use three piezoactuators each controled by PID controler. Efficiency of this compensation system was verified based on performed simulations.

The master’s thesis introduces various types of electric motors. Overall, it is divided into 6 chapters, which the first deals with special type of electric motors, namely: permanent magnet DC motor with coreless winding, piezoelectric motor and three phase induction motor with solid rotor. For all of these motors are introduced principles, types, advantages, disadvantages and applications. The second part of thesis deals with perspective types of motors, namely: single phase induction motor and reluctance motor. For all of these motors are introduced principles, types, advantages, disadvantages and applications. The third chapter deals with analysis parameters of single phase induction motor. The analysis is performed on a borrowed motor from ATAS company by measurement and verification using simulation program Ansys Maxwell. The fourth part discusses the possibilities of increasing the effectiveness of borrowed electric motor. The following is chapter five, which deals with increasing the efficiency of the motor by changing metal sheets. Results are verified by simulations with Ansys Maxwell and measurements on sample of electric motor. The last part presents electric motor design with new selected electric sheets with lower specific losses, but also with lower magnetic induction.

Um die Vortriebsleistung von Maschinen zur Festgesteinsgewinnung zu steigern, wird das Prinzip der Aktivierung seit Jahren erfolgreich eingesetzt. Dabei wird der grundlegenden Arbeitsbewegung des eingreifenden Werkzeugs eine Schlag- oder Vibrationsbewegung überlagert. Im Rahmen der vorliegenden Arbeit wurde die Möglichkeit zur hochfrequenten Aktivierung von Werkzeugen im Eingriff in Festgestein untersucht. Ziel der Arbeit ist es, die Besonderheiten beim Eingriff hochfrequent aktivierter Werkzeuge in Festgestein genauer zu definieren und zu klären, auf welchen Ursachen sie beruhen. Es werden konventionelle und hochfrequente Aktivierungsprinzipien beispielhaft vorgestellt und ein kurzer Einblick in das untersuchte Aktivierungsprinzip und dessen Besonderheiten gegeben. Eine Literaturrecherche gibt Informationen zu den Eigenschaften von Gesteinen mit besonderem Fokus auf dynamisch veränderlichen Kennwerten. Weiterhin wird Literatur zu den physikalischen Grundlagen des Werkzeugeingriffs und der Piezoaktorik vorgestellt. Eine theoretische Verarbeitung dieser Informationen in Form von Modellen wird neben praktischen Versuchen an einem Prüfstand vorgenommen.:Abkürzungen 8 1 Motivation und Einleitung 8 2 Einführung in das Thema „Aktivierte Werkzeuge” 10 2.1 Konventionelle Aktivierung . . . . . . . . . . . . . . . . . . 10 2.2 Hochfrequente Aktivierung . . . . . . . . . . . . . . . . . . 12 2.2.1 Stand der Technik . . . . . . . . . . . . . . . . . . 12 3 Eingrenzung des Problems, Definition der Arbeitsaufgaben 16 3.1 Vorbetrachtungen . . . . . . . . . . . . . . . . . . . . . . . 16 3.2 Arbeitsplan . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4 Recherchen 20 4.1 Literaturrecherche zu den Eigenschaften von Gesteinen . . 20 4.1.1 Allgemeines . . . . . . . . . . . . . . . . . . . . . . 20 4.1.2 Elastizität . . . . . . . . . . . . . . . . . . . . . . . 20 4.1.3 Härte . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.4 Festigkeit . . . . . . . . . . . . . . . . . . . . . . . 22 4.1.5 Aufbau von Gesteinen . . . . . . . . . . . . . . . . 23 4.1.6 Versagen von Gesteinsstoffen . . . . . . . . . . . . . 25 4.1.6.1 Versagensart . . . . . . . . . . . . . . . . 25 4.1.6.2 Festigkeitshypothesen . . . . . . . . . . . 26 4.1.6.3 Bruchmechanik . . . . . . . . . . . . . . . 27 4.1.7 Dynamisch veränderliches Werkstoffverhalten . . . 27 4.1.7.1 Auswirkungen auf die elastischen Eigenschaften . . . . . . . . . . . . . . . . . . . . . . 28 4.1.7.2 Auswirkungen auf die Festigkeit . . . . . . 29 4.1.7.3 Ursachen der Dehnratenabhängigkeit . . . 30 4.2 Literaturrecherche zur Modellierung des Werkzeugeingriffs 33 4.2.1 Vorbetrachtungen . . . . . . . . . . . . . . . . . . . 33 4.2.2 Grundlagen . . . . . . . . . . . . . . . . . . . . . . 34 4.2.2.1 Elementarlösung nach Boussinesq . . . 35 4.2.2.2 Flächenpressung im Kontakt . . . . . . . . 36 4.2.2.3 Superposition zu einer Flächenlast . . . . 36 4.2.2.4 Verschiebung unter einem Werkzeug . . . 37 4.2.2.5 Versagenskriterium . . . . . . . . . . . . . 37 4.3 Literaturrecherche zur Modellierung der Piezoaktorik . . . 40 4.3.1 Vorbetrachtungen . . . . . . . . . . . . . . . . . . . 40 4.3.2 Grundlagen . . . . . . . . . . . . . . . . . . . . . . 41 5 Modellbildungen und Simulationen 46 5.1 Modellierung des Werkzeugeingriffs . . . . . . . . . . . . . 46 5.1.1 Kontaktproblem . . . . . . . . . . . . . . . . . . . . 46 5.1.2 Spannungsfeld unter einer Flächenlast . . . . . . . 48 5.1.3 Dehnraten im Eingriff . . . . . . . . . . . . . . . . 51 5.1.4 Dynamische Festigkeitssteigerung . . . . . . . . . . 51 5.1.5 Erstellen des Versagenskriteriums . . . . . . . . . . 52 5.1.6 Simulation des Werkzeugeingriffs . . . . . . . . . . 54 5.2 Modellierung der Piezoaktorik . . . . . . . . . . . . . . . . 55 5.2.1 Randbedingungen . . . . . . . . . . . . . . . . . . . 55 5.2.2 Modellbildung . . . . . . . . . . . . . . . . . . . . . 58 5.2.2.1 Elektrische Größen . . . . . . . . . . . . . 58 5.2.2.2 Mechanische Größen . . . . . . . . . . . . 61 6 Versuche 62 6.1 Voraussetzungen und Ziele . . . . . . . . . . . . . . . . . . 62 6.2 Planung und Ablauf . . . . . . . . . . . . . . . . . . . . . 63 6.2.1 Vorversuche zur Verifikation . . . . . . . . . . . . . 63 6.2.2 Hauptversuchsreihen . . . . . . . . . . . . . . . . . 64 6.2.2.1 Einfluss der Aktivierungsfrequenz . . . . . 65 6.2.2.2 Einfluss von Lastwechselzahl und Nennspannung . . . . . . . . . . . . . . . . . . . . . 65 6.3 Versuchsergebnisse . . . . . . . . . . . . . . . . . . . . . . 66 6.3.1 Vorversuche zur Verifikation . . . . . . . . . . . . . 66 6.3.2 Hauptversuchsreihen . . . . . . . . . . . . . . . . . 66 7 Diskussion 70 7.1 Dynamisch veränderliche Werkstoffeigenschaften . . . . . . 70 7.2 Simulationsergebnisse zum Werkzeugeingriff . . . . . . . . 72 7.2.1 Statischer Lastfall . . . . . . . . . . . . . . . . . . . 73 7.2.2 Dynamischer Lastfall . . . . . . . . . . . . . . . . . 73 7.2.2.1 Festigkeitssteigerung unter dynamischen Belastungen . . . . . . . . . . . . . . . . . . 73 7.2.2.2 Maximaler Beanspruchungsquotient . . . . 73 7.2.2.3 Verändertes Versagensverhalten . . . . . . 74 7.2.2.4 Einfluss des E-Moduls . . . . . . . . . . . 76 7.2.2.5 Einfluss der Querdehnzahl . . . . . . . . . 77 7.2.3 Unzulänglichkeit des verwendeten Versagenskriteriums 78 7.3 Modell der Piezoaktorik . . . . . . . . . . . . . . . . . . . 79 7.4 Versuchsergebnisse . . . . . . . . . . . . . . . . . . . . . . 80 7.4.1 Auswirkungen von Lastwechselzahl und Nennspannung 80 7.4.2 Auswirkungen der Aktivierungsfrequenz . . . . . . 81 7.4.2.1 Direkter Einfluss der Aktivierungsfrequenz 81 7.4.2.2 Einfluss der resultierenden Größen . . . . 83 7.4.3 Weitere Beobachtungen . . . . . . . . . . . . . . . . 84 7.5 Hinweise zur Anwendung der gewonnenen Erkenntnisse . . 85 7.6 Schlussfolgerungen . . . . . . . . . . . . . . . . . . . . . . 86 8 Zusammenfassung und Ausblick 87 Literaturverzeichnis 90 Anhang 97 Anhang A Aktivierte Werkzeuge 97 A.1 Schutzrechte . . . . . . . . . . . . . . . . . . . . . . . . . . 97 A.2 Ergebnisse vorausgegangener Arbeiten . . . . . . . . . . . 98 B Mechanische Kennwerte einiger Stoffe 99 C Zusatzinformationen zur Modellierung des Werkzeugeingriffs 100 C.1 Superpositionsmethode . . . . . . . . . . . . . . . . . . . . 100 C.1.1 Herleitung . . . . . . . . . . . . . . . . . . . . . . . 100 C.1.2 Verifikation . . . . . . . . . . . . . . . . . . . . . . 103 C.2 Impulsbilanz im Eingriff . . . . . . . . . . . . . . . . . . . 106 C.3 Simulationsergebnisse für den Eingriff . . . . . . . . . . . . 107 D Zusatzinformationen zur Modellierung der Piezoaktorik 113 D.1 Kennwerte . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 D.2 Herleitung der Ersatzkapazität . . . . . . . . . . . . . . . . 113 D.2.1 Einfluss der Feldstärke . . . . . . . . . . . . . . . . 113 D.2.2 Einfluss der Steifigkeit des Gesamtsystems . . . . . 114 D.3 Simulationsergebnisse . . . . . . . . . . . . . . . . . . . . . 116 E Zusatzinformationen zu den Versuchen 118 E.1 Messsystem am Prüfstand . . . . . . . . . . . . . . . . . . 118 E.1.1 Werkzeugkräfte . . . . . . . . . . . . . . . . . . . . 118 E.1.2 Eindringtiefe des Werkzeugs . . . . . . . . . . . . . 118 E.1.3 Werkzeugschwingwege . . . . . . . . . . . . . . . . 119 E.1.4 Elektrische Größen am Piezoaktor . . . . . . . . . . 119 E.2 Versuchsparameter . . . . . . . . . . . . . . . . . . . . . . 120 E.3 Werkstoffkennwerte der verwendeten Gesteine . . . . . . . 121 E.4 Messergebnisse . . . . . . . . . . . . . . . . . . . . . . . . 122

Les pièces peintes de pièces extérieures automobiles doivent être réalisées en matériaux respectueux de l’environnement qui combinent à la fois fluidité, propriétés mécaniques et aspect visuel. Dans ce contexte, un polypropylène homopolymère conventionnel (PP) a été extrudé et mélangé de manière homogène avec un PP extrêmement fluide, contenant des espèces réactives dans le but d’augmenter la fluidité du mélange final. Ce procédé réactif a ensuite été appliqué à une formulation commerciale automobile de « PP choc » contenant un copolymère d’Ethylène Propylène Rubber (EPR). Une étude rhéologique a permis de modéliser l’évolution de la viscosité en fonction de la composition du mélange. Néanmoins, l’augmentation de la fluidité s’accompagne d’une diminution de la résistance au choc. De manière à faire face à la perte de propriétés mécaniques, l’utilisation d’élastomères thermoplastiques spécifiques a permis d‘augmenter la résilience au choc et l’allongement à la rupture tout en obtenant une fluidité quatre fois supérieure à celle du matériau original. Les aspects rhéologiques, thermomécaniques et morphologiques ont été soigneusement étudiés afin d’établir des relations entre la structure et les propriétés. Dans un second temps, une étude de la mise en peinture des pièces en polyoléfines injectées a été réalisée. Comme la nature hydrophobe du polypropylène ne permet pas une bonne adhésion du revêtement sur sa surface, son activation par flammage est requise. Les effets de différents paramètres (comme la vitesse, la hauteur ou le rapport air-gaz de la flamme) sont étudiés en termes de mouillabilité et d’adhésion du feuil de peinture. Ensuite, des essais aux échelles laboratoires et industrielles ont révélé un défaut du système peint lorsque le polymère possède une quantité importante de talc. L’impact de cette charge sur les propriétés rhéologiques, thermiques et mécaniques du matériau a été étudié. Il a été observé que le cisaillement sur une formulation dont la matrice polymère n’a pas d’affinité particulière avec la surface du talc est responsable d’un délaminage dans le substrat. Pour améliorer l’interface talc-matrice, l’ajout de copolymères fonctionnalisés d’anhydride maléique a permis d’augmenter le niveau d’interactions. Cet effet a été mis en évidence grâce à l’étude des propriétés rhéologiques et mécaniques du système. / Automotive painted exterior car parts have to be made of eco-friendly materials combining fluidity, mechanical properties and visual aspects. In this context, a conventional polypropylene (PP) homopolymer has been extruded and homogeneously blended with an extremely high flow PP, containing reactive species to increase the fluidity of the resulting material. The reactive process was then applied to an automotive high impact PP/Ethylene Propylene Rubber (EPR) formulation and rheological studies allowed us to model the evolution of viscosity as a function of the blend composition. Nevertheless, the increase of fluidity induces a lack of impact resistance. In order to cope with the loss of mechanical properties, the use of a specific thermoplastic elastomers allowed to successfully emphasize impact resilience and strain at break while reaching a viscosity four times lower than the one of the original material. Rheological, thermomechanical and morphological aspects were examined carefully to establish structure-properties relationships. In a second time, a study of the painting of automotive car parts, made of injected polyolefins was carried out. As the hydrophobic nature of polypropylene does not allow a good adhesion between the coating and the polymer surface, the surface activation by flame treatment is required. The effects of different parameters (such as speed, height or air to fuel ratio of the flame) were studied in terms of wettability and coating adhesion. Then, lab-scale as well as pre-industrial experiments revealed defaults of the painted systems when the polymer was highly filled with talc. Then, the impact of the filler on the rheological, thermal and mechanical properties was studied. It was observed that the effects of shear on a formulation where the polymer matrix has no particular physical affinity with the talc surface are responsible of delamination. To enhance the talc-matrix interface, the addition of maleated copolymers pointed out that maleated copolymers increase the level of interactions and lead to a more homogeneous behavior, as revealed by studying both rheological and mechanical properties.

Printed circuit boards (PCBs) are essential components in various electronic devices, playing a vital role in their functionality. Over time, PCBs have evolved significantly, becoming smaller, more complex, and multi-layered to meet the demands of advancing technology and consumer preferences. The quality of solder paste deposits is measured by circularity, volume, positioning, and the number of satellites. Mycronic is a supplier of jet printing machines for PCB manufacturers and needs to investigate and counteract an unwanted variation in volume and positioning within the first dot of the solder paste strip, and its so-called “sea saw” effect for the following three dots.  This master’s thesis has two aims. The first aim is to develop and evaluate an experimental method to reduce variation between the dots in the strip. The second aim is to reduce the variation between the 1st dot and the following three dots by finding a combination of pre-feed, first, second, and third waveforms to obtain improved precision, volume, circularity, and reduced volume variation. Using an experimental design a full factorial design was used, examining six experimental factors. The design was further augmented with a central composite design to describe the second-order model. The knowledge from the experiment was used to optimize and improve the quality factors of jet printing, which were verified with an additional experiment. The results of the study provided compelling evidence that only the selected experimental factors had a significant impact on improving the volume metric. It was observed that the presence or absence of satellites during the experiment did not have any effect on the results, and neither did the positioning and circularity factors contribute to any improvement or deterioration. Specifically, the most significant difference in volume between 1st and following three dots for the optimized solution is 0.5 nl, and the currently used settings have a difference of 2.65 nl. The experimental approach employed in this master's thesis holds excellent promise for Mycronic, as it paves the way for the future development of piezo-actuation profiles (i.e. specific settings for the jet printer). The potential contributions to the industry are significant, particularly in terms of advancing the methodology for investigating and enhancing the quality metrics of piezo-actuation profiles through experimental means. This research opens up new avenues for Mycronic to refine its printing processes and improve overall print quality, ultimately leading to better outcomes for their customers.

[pt] Ondas acústicas, sônicas ou ultrassônicas, podem ser empregadas para a telemetria sem fio como alternativa a sistemas eletromagnéticos, transferindo dados e energia ao longo de um canal formado por uma ou mais camadas de sólidos elásticos ou fluidos acústicos. Um exemplo é a interrogação de sensores passivos através de uma parede metálica. Nesta configuração, pelo menos um transdutor acústico é fixado em um lado da parede (face externa), onde uma fonte de alimentação elétrica é disponível. No lado oposto (face interna), onde os sensores estão instalados, são fixados um ou mais transdutores. Na maioria das aplicações estes transdutores são cerâmicas piezelétricas que geram e recebem sinais ultrassônicos. Ondas acústicas ultrassônicas se propagam ao longo do sólido elástico, transferindo energia e dados entre as duas faces, possibilitando a alimentação e interrogação dos sensores. Este tipo de configuração pode ser empregado em aplicações onde o uso de penetradores elétricos ou ópticos não é recomendado. Entretanto, a resposta das piezocerâmicas pode sofrer influências de variações de temperatura e da própria deformação mecânica da parede metálica na qual são fixados. O presente trabalho procurou quantificar a influência da deformação mecânica e da variação de temperatura na comunicação entre dois transdutores piezocerâmicos ultrassônicos, aderidos à uma placa metálica por meio de adesivo epóxi. No estudo, tomou-se como parâmetro quantitativo o sinal S21, que é o logaritmo da razão entre a potência recebida pela saída do sistema (face interna da parede) pela potência transmitida pela entrada (face externa da parede). O trabalho apresenta comparações entre resultados experimentais e simulados através de um modelo numérico de elementos finitos desenvolvido no COMSOL Multiphysics. Os ensaios experimentais foram realizados com pastilhas piezocerâmicas circulares, do tipo PZT4, com diâmetro e espessura de 25 e 2 mm, respectivamente. Os transdutores foram fixados, de forma concentricamente alinhada e por meio de um adesivo epóxi, nas duas superfícies de uma placa de aço inoxidável AISI 316 L com 6 mm de espessura. O trabalho apresenta tabelas e funções para a amplitude do sinal S21 na frequência onde a transferência de potência é maximizada. Para os casos estudados, observou-se que a frequência ideal muda muito pouco com a temperatura ou a deformação da placa sobre a qual os transdutores são fixados, permanecendo com valores entre 0,988 e 0,995 MHz em todas as condições avaliadas. Em função da deformação da placa metálica, a amplitude do sinal S21 também variou muito pouco, de -3,70 para -3,14 dB, desde a condição indeformada da placa até a máxima deformação aplicada, que foi de 1250 (Micro)m/m. Quanto à variação com a temperatura, na faixa de 30 a 100 Graus C, mais uma vez observou-se apenas um pequeno aumento de 0,8 dB na amplitude do sinal S21. Entretanto, para temperaturas acima de 100 Graus C, o sinal passa a cair rapidamente. Em nenhuma das condições estudadas neste trabalho foi observado prejuízo na transferência de potência entre os transdutores, indicando que este tipo de comunicação pode ser uma alternativa robusta ao uso de penetradores elétricos. / [en] Acoustic, sonic or ultrasonic waves can be used for wireless telemetry as an alternative to electromagnetic systems, transferring data and energy along a channel formed by one or more layers of elastic solids or acoustic fluids. An example of this is the interrogation of passive sensors through a metallic wall. In this configuration, at least one acoustic transducer is attached to one face of the wall (external face) where electrical power supply is available. One or more transducers are also attached to its other side (internal face) where the sensors are installed. In most applications, these transducers are piezoelectric ceramics that generate and receive ultrasonic signals. Ultrasonic acoustic waves propagate along the elastic solid, transferring energy and data between both sides, which enables the power supply and interrogation of the sensors. This type of configuration can be used in applications where the use of an electrical or optical penetrator is not suitable. However, the response of piezoceramics may be affected by temperature variations and mechanical deformations of the metallic wall on which they are attached. The present work sought to quantify the influence of mechanical deformation and temperature changes on the communication between two ultrasonic piezo ceramic transducers, adhered to a metal plate by using an epoxy adhesive. The parameter used to quantify this influence was the S21 signal, which is the logarithm of the ratio between the power received from the output of the system (internal face of the wall) to the power transmitted by the input (external face of the wall). The work presents comparisons between experimental and simulated results obtained by using a finite element model developed through the commercial software COMSOL Multiphysics. In the configuration experimentally tested, two PZT-4 disks with diameter and thickness of, respectively, 25 and 2 mm were concentrically attached to both sides of a 6 mm thick, AISI 316 L stainless steel plate. Amplitudes of the S21 signal measured at the frequency where power transfer is maximized were obtained for different temperature and strain levels. Results for all of the evaluated conditions showed that the impedance matching frequency suffers little influence from temperature variations or strain in the plate on which the transducers are attached, having remained within a range from 0.988 to 0.995 MHz in all tests. As mechanical strains were applied to the metal plate, the amplitude of the S21 signal varied from -3.70 dB to -3.14 dB, from the undeformed condition to the maximum applied deformation (1250 (Micro)m/m). Regarding temperature changes, a small increase of 0.8 dB in the amplitude of the S21 signal was observed when increasing temperature from 30 C Degrees to 100 C Degrees. However, for temperatures above 100 C Degrees, the signal was found to quickly decay. None of the conditions studied in this work brought any impairment to the power transfer between the transducers, indicating that this type of communication can be a robust alternative to electrical penetrators.

No description available.

This thesis aims to develop a new type of highly stretchable strain sensor to measure large deformation of a specimen subjected to dynamic loading. The sensor was based on the piezo-resistive response of carbon nanotube(CNT)/polydimethysiloxane (PDMS) composites thin films, some nickel particles were added into the sensor composite to improve the sensor performance. The piezo-resistive response of CNT composite gives high frequency response in strain measurement, while the ultra-soft PDMS matrix provides high flexibility and ductility for large strain measuring large strain (up to 26%) with an excellent linearity and a fast frequency response under quasi-static test, the delay time for high strain rate test is just 30 μs. This stretchable strain sensor is also able to exhibit much higher sensitivities, with a gauge factor of as high as 80, than conventional foil strain gauges.

The growth of sensors and sensing technologies have made significant impact in our day-to-day life. The five principle sensory organs of our body should perform effectively, so that we can lead a good healthy life. Apart from these natural sensors, there are man-made sensors that helps us to cope with diseases, organ failure etc. and enable us to lead a normal life. In recent years, with the prevalence of new kind of diseases, the need for new type of biomedical sensors is becoming very important. As a result, sensors used for biomedical applications have become an emerging technology and rapidly growing field of research. The aim of the present thesis work is to use the piezoelectric property of Polyvinylidene Fluoride (PVDF) film for the development of biomedical sensor and studying its application for human respiration/breathing related abnormalities. PVDF nasal sensor was designed in cantilever configuration and detailed theoretical analysis of the same was performed. Based on theoretical and experimental results, the PVDF nasal sensor dimensions were optimized. Suitable signal conditioning circuitry was designed and a measurement system for biomedical application was developed. The developed PVDF nasal sensor was calibrated using MEMS low-pressure sensor. The PVDF nasal sensor system has been applied in different biomedical applications namely, (i) to monitor human respiration pattern, (ii) to identify different Respiration Rates (RR), (iii) to evaluate Deviated Nasal Septum (DNS) in comparison with other objective method and, (vi) to clinically investigate nasal obstruction in comparison with subjective method. The thesis is divided into seven chapters. Chapter 1 This chapter gives a general introduction about biomedical sensors, piezoelectric sensing principle and PVDF polymer films along with the relevant literature survey. The brief introduction as well as literature survey of techniques used to monitor human respiration and to measure nasal obstruction is also included in this chapter. Chapter 2 This chapter gives details about the design of the PVDF nasal sensor in the cantilever configuration for sensing nasal airflow along with the relevant theoretical equations. Also, the details on the optimization of the PVDF nasal sensor dimensions based on the theoretical and experimental analysis are presented. Chapter 3 This chapter reports the designing of the necessary signal conditioning hardware along with the data acquisition unit for the PVDF nasal sensor. The signal conditioning hardware unit made consists of charge amplifier, low-pass filter and an amplifier. Besides, a complete measurement system for biomedical application was developed using PVDF nasal sensor and its merits and demerits were discussed. Chapter 4 In this chapter, an experimental set-up for measuring human respiration/breathing pressure using water U-tube manometer has been described. Also, the calibration procedure followed for the developed PVDF nasal sensor using a Micro Electro Mechanical Systems(MEMS) low pressure sensor is reported. Apart from these, the details on the measurement of deflection of the PVDF cantilever sensing element using laser displacement setup are provided. In addition, the PVDF nasal sensor was also calibrated for various air flow rates. At the end, a study has been reported on optimizing the position the PVDF nasal sensor with respect to human nose. Chapter 5 This chapter is divided into two sections, Section 5.1: This section describes the applicability of the PVDF nasal sensor using its piezoelectric property to monitor the human respiration pattern of each nostril simultaneously. The results of the PVDF nasal sensor have also been evaluated by comparing with Respiratory Inductive Plethysmograph(RIP) technique in normal subjects. Section 5.2: In this section, PVDF nasal sensor, RIP and Nasal Prongs (NP) techniques were used to measure the RR of healthy adults. The aim here was to evaluate the presently developed PVDF nasal sensor for identifying different RR compared to „Gold standard‟ RIP and NP methods. Chapter 6 This chapter is divided into two sections. Section 6.1: This section reports about the utilization of the developed PVDF nasal sensor for clinical application on the patient population. For this purpose, the performance of the PVDF nasal sensor measurements has been compared with the Peak Nasal Inspiratory Flow(PNIF) objective technique and visual analog scale (VAS). Section 6.2: This section describes about the use of PVDF nasal sensor system to measure nasal obstruction caused due to DNS objectively. Further, the results of the PVDF nasal sensor were compared with subjective techniques namely, VAS and clinician scale in patients and control group. Chapter 7 This chapter is composed of two sections. Section 7.1: This section summarizes the salient features of the work presented in this thesis. Section 7.2: This section reports a scope for carrying out further work.