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1

WANG, ZHAOMIN. "Measurements of Cosmic Ray Proton + Helium flux with the DAMPE experiment." Doctoral thesis, Gran Sasso Science Institute, 2020. http://hdl.handle.net/20.500.12571/9942.

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Анотація:
This thesis concentrates on the measurement of cosmic-ray light component (proton + helium) spectrum with the Dark Matter Particle Explorer (DAMPE). In chapter one, an introduction on cosmic-ray history is given together with the acceleration mechanism and some recent experiments. A description on DAMPE system is presented in chapter two, which includes its sub-detectors, scientific targets and parameters. There are various challenges in measuring cosmic ray energy with a limited-size calorimeter (like the BGO of DAMPE). In chapter three, various unfolding methods for reconstructing the primary energy of cosmic ray nuclei are discussed. It turns out that the method based on the Bayes theorem has the best performance on reconstructing the cosmic-ray energy for DAMPE. The test results show that the Bayes method is capable of reconstructing nuclei energy with good accuracy on both MC samples (bias within 2%) and real data that come from the test beams at CERN (bias within 3%). In chapter four, a detailed description on the measurement of cosmic ray protons + helium spectrum is presented, which involves the candidates selection, energy reconstruction and calculation of the statistical and systematic uncertainties. Finally, the proton + helium spectrum with energy 40 GeV to 100 TeV is presented.
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2

Andersson, Jesper, and Nilsson Maria Hedström. ""Dom kallade mig för Dampe och Erik för Hyper men jag tror inte dom menade något negativt" : En retrospektiv undersökning om unga vuxnas upplevelse av resursskola." Thesis, Stockholms universitet, Institutionen för socialt arbete - Socialhögskolan, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139294.

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Анотація:
The purpose of this study was to examine how young adults who have been diagnosed with neuropsychiatric disabilities or other behavioural disorders reflect about the institution (resursskola) and how the institution has affected their identity. Earlier research has shown that categorization of pupils in school leads to deviation. The theoretical approaches were Stigma (Goffman, 1973), Asylums (Goffman, 1973) and a current identity theory. The aim has been to map the respondents’ life history through narrative life stories, and connect them to the context of the examination. Three qualitative semi-structured interviews were analysed using a narrative method, with inspiration from the hermeneutic interpretation model. The material was processed using a narrative content analysis. The themes were structured in chronological order through common themes raised by the respondents. The result shows that taking a student out of their context can cause a double stigmatisation. The respondents’ identities are understood as changing. The study shows that structural and organisational conditions were big influencing factors to the individual’s identity shaping. The result indicates that the institution contributed to stigmatisation and a feeling of alienation in other social environments. But it can also be positive if the respondents can identify themselves with the collective belonging.
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3

Tusset, Ângelo Marcelo. "Controle ótimo aplicado em modelo de suspensão veicular não-linear controlada através de amortecedor magneto-reológico." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/15395.

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Анотація:
Este trabalho apresenta uma proposta para o controle da suspensão veicular utilizando o amortecedor magneto-reológico, sendo o controle proposto composto pela associação de duas estratégias de controle, o controle ótimo e o controle fuzzy. O Controle ótimo é utilizado para determinar a força a ser utilizada pelo amortecedor magneto-reológico, e o controle fuzzy é utilizado para determinar a corrente elétrica, a ser utilizada no amortecedor magento-reológico e é obtido considerando o modelo de Mandani. Para o controle fuzzy, são consideradas duas entradas, a velocidade de deslocamento do pistão do amortecedor e a força prevista pelo controle ótimo, e uma saída, a corrente elétrica [A]. Para demonstrar a eficiência do controle proposto são consideradas simulações computacionais, utilizando um modelo matemático não-linear de um quarto de veículo. A análise do desempenho do controle é realizada, considerando excitações provocadas por irregularidades na pista, as irregularidades são representadas por entradas tipo degrau, impulso e senoidal. As simulações computacionais são realizadas, utilizando o Matlab® e o Simulink. Os resultados das simulações demonstram que o controle proposto aumenta a segurança do veículo e melhora sua dirigibilidade, reduzindo o deslocamento vertical do conjunto eixo e roda e o espaço de trabalho do amortecedor, quando comparado como o sistema passivo. Também contribui com o conforto dos passageiros, reduzindo as oscilações da carroceria, mantendo os níveis de aceleração abaixo dos considerados desconfortáveis pela norma BS 6841, 1987. Para verificar o comportamento do controle proposto, diante de incertezas, são realizadas simulações computacionais, considerando a possibilidade de erros paramétricos. As simulações, considerando os erros paramétricos, demonstram que o controle ótimo, mesmo quando sujeito a incertezas, permanece sendo estável e ótimo.
This work presents a proposal for control of vehicular suspension using the magneto-rheological damper, the proposed control is composed by association of two control strategy, the optimal control and the fuzzy control. The optimal control is used to determine the power to be applied by the magneto-rheological damper, and the fuzzy control is used to determine the electric current to be used in the magneto-rheological damper and is obtained considering the Mandani's model. For the fuzzy control two inputs are considered, the velocity of the piston's damper and the force provided by the optimal control, and one output, the electric current [A]. To demonstrate the efficiency of the proposed control, computational simulations are considered using a nonlinear mathematical model for a quarter-car. The performance of the control is analyzed considering excitements provoked by irregularities in the track, the irregularities are represented by entrances step type, pulse and sinusoidal. The computational simulations are performed using the Matlab® and the Simulink. The results of simulations show that the proposed control increases the vehicle security and improves the drive ability by reducing the vertical wheel displacement and the workspace to be used by the damper when compared to the passive system. It also helps with the comfort of passengers, reducing the bodywork oscillations, maintaining levels of accelerating below considered uncomfortable by standard BS 6841, 1987. To verify the behavior of the proposed control, in the face of uncertainty, computational simulations are carried out, considering the possibility of parametric errors. The simulations, show that the Optimal Control, even when subject to uncertainties, remains stable and optimal.
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4

Jangam, Ranjit. "Relationship between damper resistance and damper insertion depth." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4509.

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Анотація:
Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains xi, 97 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 62-63).
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5

Nyhus, Kaia Dahle. ""Voksen dame"." Thesis, Konstfack, Grafisk Design & Illustration, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-5253.

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Анотація:
My project “Grown Woman” is about the role, the responsibilities and the challenges of being a grown woman. I use myself as a model for study, finding familiar situations, but without being autobiographical. I use visual storytelling for researching this topic, trying to visualize a selection of situations and thereby telling the story of being this particular grown up. Up to now, I have been working as an illustrator, doing a lot of animation as well. For this project I wanted to tell the story through comics, but it ended up being a mix between a graphic novel, a picture book, a flip book and comics, being more like a series of stills from an animation. In my master thesis I try to think through the choices of this project, trying to reflect on the choices, how they worked out in the process of making this booklet as my final piece of work. Also I try to reflect on the project as a research process. It is a complex process with lots of sidetracks, failures, surprises and luck. It is not perfect. It could have been better and different. This text is about how, what and why it became the way it did and why the process ended where it ended. Under my presentation there were a lot of people who were moved and touched by this story and this figure, and it surprised me that many felt a familiarity and a resemblance to themselves in it.
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6

Poynor, James Conner. "Innovative Designs for Magneto-Rheological Dampers." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34520.

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Анотація:
Magnetorheological dampers, or as they are more commonly called, MR dampers, are being developed for a wide variety of applications where controllable damping is desired. These applications include dampers for automobiles, heavy trucks, bicycles, prosthetic limbs, gun recoil systems, and possibly others. This thesis first introduces MR technology through a discussion of MR fluid and then by giving a broad overview of MR devices that are being developed. After giving the reader an understanding of MR technology and devices, MR damper basics are presented. This section includes a discussion of MR damper types, mathematical fundamentals, and an approach to magnetic circuit design. With the necessary background information covered, MR dampers for automotive use are then discussed. Specifically, designs for MR dampers that were built for a Mercedes ML-430 and for a Ford Expedition are presented along with their respective test results. These test results are presented and compared with the original equipment hydraulic dampers. After discussing automotive MR dampers, designs for gun recoil applications are presented. Specifically, two different MR damper designs are discussed along with live-fire test results for the first damper. Finally, two hybrid dampers that were based on a modified adjustable hydraulic damper are presented. These hybrid dampers, if pursued further, may develop into controllable replacements for large hydraulic dampers such as those installed on large vehicles and field Howitzers. In conclusion, recommendations are made for materials as well as for seal selection and other design aspects.
Master of Science
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7

Tervaniemi, Ulrika. "DAMP -hur skolsituationen kan underlättas för elever med DAMP-svårigheter." Thesis, Linköping University, Department of Educational Science (IUV), 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-947.

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Анотація:

Syftet med detta arbete är att genom litteraturstudier och en empirisk undersökning få en bättre insikt i vad DAMP är och vad det kan innebära för elever med denna diagnos. Jag vill även ta reda på vad skolans ansvar är och hur lärare i skolan kan hjälpa och underlätta för elever med dessa svårigheter.

Arbetet består av två delar, varav den första är en litteraturgenomgång där olika forskares syn och åsikter om DAMP är presenterade och sammanställda. Den andra delen består av en undersökande del där intervjuer med fyra olika lärare, om deras kunskaper om hur lärare kan underlätta för DAMP-elever, presenteras.

Genom litteraturen och den empiriska undersökningen har det framkommit att DAMP är ett osynligt handikapp som kan bero på många olika faktorer, av vilka forskarna inte är riktigt överens om. För ett stort antal barn innebär DAMP en mängd olika svårigheter som de behöver hjälp och stöd för att kunna hantera. Det finns inte heller några specifika åtgärder som man kan tillämpa på samtliga barn med dessa svårigheter. Man måste hela tiden se till den enskilda individens behov och förutsättningar och utefter det komma fram till vad som passar bäst för den enskilda eleven. Genom kunskap och med hjärta och hjärna i samspel kan man hjälpa barn med särskilda svårigheter. Det gäller bara att vara lyhörd och öppen för deras behov och att anpassa sig efter vad de behöver.

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8

Malmström, Karin, and Carola Strid. "Elever med DAMP." Thesis, Linköping University, Department of Educational Science (IUV), 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-881.

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Анотація:

DAMP står för Dysfunktion ifråga om Aktivitetskontroll och uppmärksamhet, Motorikkontroll och Perception. Enligt forskarna finns det minst en elev i varje klass som kan ha DAMP. Handikappet innebär funktionsstörning inom många olika områden och av olika hög grad, därför finns det stora skillnader i de symptom som dessa barn uppvisar. Genom kunskap och förståelse för barnets handikapp kan man som lärare underlätta barnets skolgång. Det är skolans ansvar att se till att de barn som uppvisar problem av DAMP-symptom får den hjälp de behöver. Samarbete mellan föräldrar, klasslärare, assistent och all övrig personal runt eleven är värdefull.

Detta examensarbete består av en litteraturdel och en praktisk del. Den praktiska delen innefattar en studie av DAMP-elevers skolsituation i två olika skolmiljöer, särskild- och vanlig undervisningsgrupp.

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9

Bartholomew, Wayne Alan II. "The Bronze Dame." Youngstown State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1234824916.

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10

Bartholomew, Wayne. "The bronze dame /." Connect to resource online, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1234824916.

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11

Agutu, Willis Owuor. "Characterization of electromagnetic induction damper." Oxford, Ohio : Miami University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1187267117.

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12

McGarry, Matthew. "Rayleigh Damped Magnetic Resonance Elastograpy." Thesis, University of Canterbury. Mechanical Engineering, 2008. http://hdl.handle.net/10092/1918.

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Анотація:
A three-dimensional, incompressible, Rayleigh damped magnetic resonance elastography (MRE) material property reconstruction algorithm capable of reconstructing the spatial distribution of both the real and imaginary parts of the shear modulus, density and bulk modulus from full-field MR-detected harmonic motion data was developed. The algorithm uses a subzone-based implementation of motion error minimization techniques, using 27 hexahedral finite elements, and is written in FORTRAN to run on high performance distributed computing systems. The theory behind the methods used is presented in a form that is directly applicable to the code's structure, to serve as a reference for future research building on this algorithm. Globally defined Rayleigh damping parameter reconstructions using simulated data showed that it is possible to reconstruct the correct combination of Rayleigh parameters under noise levels comparable to MR measurements. The elastic wave equation is used to demonstrate that use of a one parameter damping model to fit a Rayleigh damped material can lead to artefacts in the reconstructed damping parameter images, a prediction that is verified using simulated reconstructions. Initial results using MR-detected motion data from both gelatine phantoms and in-vivo cases produced good reconstructions of real shear modulus, as well as showing promise for successful imaging of damping properties. An initial investigation into an alternative elemental basis function approach to supporting the material property distribution produced some promising results, as well as highlighting some significant issues with large variations across the elements.
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13

Kainane, Mezadek Mohamed. "Structural damped sigma-evolution operators." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-137146.

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The subject of the thesis is the investigation of asymptotic properties of solutions of the Cauchy problem for structurally damped sigma-evolution operators with time dependent, monotonous, dissipation term. An appropriate energy for solutions of the sigma-evolution equations is defined and some estimates for energies of higher order are proved. In the scale invariant case the optimality of these estimates is shown. Further, the influence of properties of the time dependent dissipation on L^p-L^q estimates for the energy with p and q bigger or equal to 2 and from the conjugate line is clarified. Also smoothing properties of the operators under consideration are investigated. The connection between the regularity of the data and the regularity of the solution in terms of L^2 based Gevrey spaces is considered. Finally, L^1-L^1-estimates in the special case delta = sigma/2 and decreasing dissipative coefficient
Thema der vorliegenden Dissertation ist die Untersuchung asymptotischer Eigenschaften von Lösungen des Cauchy Problems für strukturell gedämpfte sigma-Evolutions-Operatoren mit zeitabhängigem, monotonen Dissipationskoeffizienten. Es wird eine geeignete Energie definiert und für diese Abschätzungen, auf für entsprechende Energien höherer Ordnung gezeigt. Darüber hinaus wird der Einfluss des Dissipationskoeffizienten auf L^p-L^q Abschätzungen auf und entfernt von der konjugierten Linie untersucht. Im skaleninvarianten Fall wird die Schärfe der Abschätzungen bewiesen. Weiterhin wird der Zusammenhang zwischen der Regularität der Daten und der der Lösung in Termen von L^2-basierten Gevrey-Räumen untersucht. Schließlich werden L^1-L^1-Abschätzungen für den Spezialfall delta = sigma/2 und monoton fallenden Dissipationskoeffizienten gezeigt
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14

Prior-Wandesforde, A. R. "Estimation of exponentially damped sinusoids." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384235.

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15

Vyas, Saurabh, and Venkata Dinesh Raju Jonnalagadda. "Modelling of Automotive Suspension Damper." Thesis, KTH, Fordonsdynamik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293498.

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Анотація:
A hydraulic damper plays an important role in tuning the handling and comfort characteristicsof a vehicle. Tuning and selecting a damper based on subjective evaluation, by considering theopinions of various users, would be an inefficient method since the comfort requirements of usersvary a lot. Instead, mathematical models of damper and simulation of these models in variousoperating conditions are preferred to standardize the tuning procedure, quantify the comfortlevels and reduce cost of testing. This would require a model, which is good enough to capture thebehaviour of damper in various operating and extreme conditions.The Force-Velocity (FV) curve is one of the most widely used model of a damper. This curve isimplemented either as an equation or as a look-up table. It is a plot between the maximum forceat each peak velocity point. There are certain dynamic phenomena like hysteresis and dependencyon the displacement of damper, which cannot be captured with a FV curve model, but are requiredfor better understanding of the vehicle behaviour.This thesis was conducted in cooperation with Volvo Cars with an aim to improve the existingdamper model which is a Force-Velocity curve. This work focuses on developing a damper model,which is complex enough to capture the phenomena discussed above and simple enough to beimplemented in real time simulations. Also, the thesis aims to establish a standard method toparameterise the damper model and generate the Force-Velocity curve from the tests performedon the damper test rig. A test matrix which includes the standard tests for parameterising andthe extreme test cases for the validation of the developed model will be developed. The final focusis to implement the damper model in a multi body simulation (MBS) software.The master thesis starts with an introduction, where the background for the project is described and then the thesis goals are set. It is followed by a literature review in which fewadvanced damper models are discussed in brief. Then, a step-by-step process of developing thedamper model is discussed along with few more possible options. Later, the construction of a testmatrix is discussed in detail followed by the parameter identification process. Next, the validationof the developed damper model is discussed using the test data from Volvo Hällered ProvingGround (HPG). After validation, implementation of the model in VI CarRealTime and Adams Caralong with the results are presented. Finally the thesis is concluded and the recommendations forfuture work are made on further improving the model.
En hydraulisk stötdämpare spelar en viktig roll för att fordonets hantering och komfort. Attjustera och välja en stötdämpare baserat på subjektiv utvärdering, genom att beakta olika användares åsikter, skulle vara en ineffektiv metod eftersom användarnas komfortkrav varierarmycket. Istället föredras matematiska modeller av stötdämpare och simulering av dessa modellerunder olika driftsförhållanden för att standardisera inställningsförfarandet, kvantifiera komfortnivåerna och minska testkostnaden. Detta skulle kräva en modell som är tillräckligt bra för attfånga upp stötdämparens beteende under olika drifts- och extrema förhållanden.Force-Velocity (FV) -kurvan är en av de mest använda stötdämparmodellerna. Denna kurvaimplementeras antingen som en ekvation eller som en uppslagstabell. Det är ett diagram somredovisar den maximala kraften vid varje maxhastighetspunkt. Det finns vissa dynamiskafenomen som hysteres och beroende av stötdämparens förskjutning, som inte kan fångas med enFV-kurvmodell, men som krävs för att bättre förstå fordonets beteende.Denna avhandling genomfördes i samarbete med Volvo Cars i syfte att förbättra den befintligastötdämparmodellen som är en Force-Velocity-kurva. Detta arbete fokuserar på att utveckla enstötdämparmodell, som är tillräckligt komplex för att fånga upp de fenomen som diskuteratsovan och tillräckligt enkel för att implementeras i realtidssimuleringar. Avhandlingen syftarockså till att upprätta en standardmetod för att parametrisera spjällmodellen och generera ForceVelocity-kurvan från de test som utförts på stötdämpartestriggen. En testmatris som innehållerstandardtest för parametrisering och extrema testfall för validering av den utvecklade modellenkommer att utvecklas. Det sista fokuset är att implementera stötdämparmodellen i en multi-bodysimulation (MBS) programvara.Examensarbetet inleds med en introduktion, där bakgrunden för projektet beskrivs ochdärefter definieras målen med arbetet. Det följs av en litteraturöversikt där några avanceradestötdämparmodeller diskuteras i korthet. Därefter diskuteras en steg-för-steg-process för attutveckla stötdämparmodeller tillsammans med några fler möjliga alternativ. Senare diskuteraskonstruktionen av en testmatris i detalj följt av parameteridentifieringsprocessen. Därefterdiskuteras valideringen av den utvecklade stötdämparmodellen med hjälp av testdata från VolvoHällered Proving Ground (HPG). Efter validering presenteras implementeringen av modellen iVI CarRealTime och Adams Car tillsammans med resultaten. Slutligen avslutas rapporten medslutsatser från arbetet och rekommendationer för framtida arbete görs för att ytterligare förbättramodellen.
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16

Agutu, Willis Owuor Mr. "Characterization of electromagnetic induction damper." Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1187267117.

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17

Burke, William Churchill Taliaferro. "Large Force Range Mechanically Adjustable Dampers for Heavy Vehicle Applications." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33386.

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Анотація:
Semi-active dampers utilizing various working principles have been developed for a variety of vehicles. These semi-active dampers have been designed to resolve the ride and handling compromise associated with conventional passive dampers, and increase vehicle stability. This thesis briefly reviews existing semi-active damper designs, including but not limited to MR dampers, before presenting two new prototype semi-active hydraulic dampers. Both prototype dampers are designed to provide a large force range while maintaining easily controllable valve characteristics.

The first of these dampers served primarily as a proof of concept and a means of understanding the dynamics of a disc valve housed inside the main piston. The valve design is presented, along with other information concerning the fabrication of the Initial Prototype damper. Test results are presented and analyzed, and a second iteration of the valve is designed. The Final Prototype damper is a scaled up version of the initial design, with refinements made in piston geometry, internal disc profile, and dynamic seals. This large force range damper is tested and results are compared with existing MR dampers. The Final Prototype damper provides a significantly larger force range when compared with typical MR dampers. Finally, to conclude this research, the vehicle dynamics implications of the Final Prototype damper are discussed and recommendations for further study are made.
Master of Science

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18

Söderberg, Åsa. "DAMP : ett osynligt handikapp." Thesis, Linköping University, Department of Educational Science (IUV), 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-601.

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Анотація:

Syftet med detta examensarbete är att ta reda på vad DAMP (Dysfunktion i fråga om Avledbarhet, Motorik och Perception) är och hur vi kan hjälpa barn med denna problematik i skolan. För att finna svar på mina frågor i ämnet har jag läst litteratur samt gjort egna empiriska studier. DAMP-problematiken är oerhört utbredd i Sverige idag. Man räknar med att det finns minst ett barn i varje klass som har DAMP i våra skolor. Min viktigaste slutsats i detta arbete är att barn som har DAMP är individer liksom alla människor i samhället. Därför kan man aldrig upprätta ett handlingsprogram som generellt skall användas till elever med DAMP, utan man alltid måste utgå ifrån indivdens särskilda behov.

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19

McLain, Melanie. "Warm Compression – Damp Gestures." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2810.

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Анотація:
Thoughts on vulnerability, emotions, social interaction, self-awareness, skin, touching, bodily functions, and the combination of all these ideas into a confined space filled with heat and humidity just enough to leave you feeling damp and perhaps a bit sore.
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20

Williamson, Ian James. "Asthma and damp housing." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/22745.

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Анотація:
The aims of this thesis were to determine if there is an association between damp housing and asthma and to investigate whether damp housing adversely influences asthma severity. Asthmatic subjects reported more damp in both their current (Odds Ratio 4.1, 95%CL 2.3 to 7.6) and previous (Odds Ratio 1.9, 95%CI 1.1 to 3.2) dwellings than control subjects. The surveyor confirmed 112 (51%) dwellings to have evidence of damp and 57 (26%) evidence of visible mould growth. Dampness was detected in 58/90 (64%) dwellings of asthmatic subjects compared with 54/132 (41%) dwellings of control subjects (Odds Ratio 2.62, 95%CI 1.50 to 4.55). There was an increasing prevalence of damp in the dwelling with increasing severity of asthma. This association could not be explained by potential bias in study design and persisted after controlling for socio-economic and other confounding variables (adjusted odds ratio 3.03, 95% CI 1.65 to 5.57). Asthma severity scores correlated statistically with measures of total damp (r=0.30, p=0.006) and visible mould growth (r=0.23, p=0.035) in the dwelling. Patients living in homes with evidence of damp had a lower FEV1 (mean difference 10%, 95% CI 1.0 to 20) and a lower FEV1/FVC ratio (mean difference 5.4%, 95% CI -0.1 to 10.9) than patients living in dry dwellings. These associations persisted after controlling for unemployment, household income and cigarette smoking. Asthma is significantly associated with living in damp housing. Measures of asthma severity, disability and airflow obstruction are higher in patients living in damp, mouldy dwellings. Effective measures to reduce the risk of damp and condensation occurring in dwellings are required to be incorporated into future housing design.
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21

Hamilton, Clare. "Trafficking and function(s) of DAMP1." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432741.

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22

Patni, Kavita. "Damped Navier-Stokes equation in 2D." Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/809731/.

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The main object to study in this thesis is the so-called damped and driven Navier-Stokes equations. These equations differ from the classical Navier-Stokes system by the presence of the extra damping term which is greater than zero, which is often referred to as the Ekman damping term and models the bottom friction in two-dimensional oceanic models.
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23

Kubík, Michal. "Magnetorheological Suspension Damper for Space Application." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-371779.

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Disertační se práce se zabývala vývojem magnetoreologického (MR) tlumiče odpružení pro kosmonautiku. Dle současného stavu poznání jsou důležitými parametry pro semi-aktivně řízený tlumič pro kosmonautiku hermetické oddělení pracovní kapaliny od zbytku nosiče a krátká časová odezva tlumícího elementu. Těmto požadavkům vyhovuje magnetoreologický tlumič s vlnovcovou jednotkou. Magnetický obvod MR tlumiče pro kosmonautiku byl vyroben z feritového materiálu, který umožnil výrazně snížit časovou odezvu. Hermetičnost byla zajištěna použitím vlnovcové jednotky. Konstrukce takového typu tlumiče ovšem přináší celou řadu problémů. Vyvinutý MR tlumič s feritovým magnetickým obvodem dosahoval časové odezvy 4.1 ms a dynamického rozsahu 8. Během konstrukčních prací na MR tlumiči pro kosmonautiku byly hledány nové metody pro konstrukci semi-aktivně řízeného MR tlumiče s krátkou časovou odezvou. Konkrétně se jednalo o metodu eliminace vířivých proudů v magnetickém obvodu MR tlumiče, magnetostatický a transietní magnetický model, CFD model obtokové štěrbiny, hydraulický model MR tlumiče a jejich experimentální verifikace. Tyto nové metody umožní konstrukci MR tlumiče pro kosmonautiku lehčí, s nižší časovou odezvou a vyšším dynamickým rozsahem.
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24

Brown, John. "A SPACE BASED PARTICLE DAMPER DEMONSTRATOR." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/501.

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The structure and payload of a CubeSat flight experiment that investigates the performance of particle dampers in a micro-gravity environment was designed, built, and tested, and will provide on orbit data for model validation and improved performance predictions for space applications of particle damping. A 3-D solid model of the integrated CubeSat structure and payload was created satisfying all constraints from CubeSat and the System Dynamics Department at Northrop Grumman Aerospace Systems. The model was verified using commercially available Finite Element Analysis software (FEA), and a prototype structure part was fabricated. The prototype was tested and verified the FEA. A complete subassembly ready for flight was manufactured as an engineering unit and tested to space qualification loads of both launch vibration and thermal vacuum. Two additional units were contracted out for manufactured to serve as the flight unit and backup, and are currently ready for launch.
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25

Björk, Gisela. "DAMP-barn i våra klassrum." Thesis, Linköping University, Department of Educational Science (IUV), 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1159.

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Syftet med uppsatsen är att öka kunskapen om och förståelse för barn med DAMP för att kunna bemöta dem med genomtänkta strategier i en klassrumssituation.

Uppsatsen är uppdelad i en teoridel och i en metoddel. I teoridelen har jag tagit del av olika författares kunskap på området som jag försöker strukturera upp och sammanfatta på ett överskådligt sätt. Jag har bland annat läst böcker av Duvner, Gillberg och Kadesjö. Efter genomförd litteraturgenomgång vidgar jag perspektivet (metoddelen) genom att intervjua personer som lever med DAMP-problematiken i vardagen. I min diskussion länkar jag samman teori och verklighet, dvs de utsagor som blev resultaten från intervjuerna. Utifrån denna helhetsbild försöker jag skissa fram olika pedagogiska strategier som kan fungera som redskap för mig som lärare i arbetet med DAMP-barn.

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26

Aröd, Helene. "Daniel- en pojke med DAMP." Thesis, Linköping University, Department of Educational Science (IUV), 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-797.

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Syftet med detta arbete är att skapa förståelse för barn med DAMP/ADHD och allmänt belysa deras problematik. Idag räknar man med att det finns minst ett barn i varje klass som har DAMP/ADHD i våra skolor. För att hjälpa barnen krävs det kunskap om deras handikapp. I mitt arbete har jag kommit fram till att barn med DAMP/ADHD uppvisar olika svårigheter vilka varierar hos de olika barnen. Därför måste skolgången anpassas till just den individen. Arbetet belyser även familjens situation. Min empiriska del utgår från en fallstudie där jag följer en pojke som har fått hjälp genom alternativ behandling i form av läkepedagogik. Inom läkepedagogiken tar man fasta på att barnet är en individ som har ett friskt jag och arbetar utifrån det.

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Lorentzon, Malin, and Britt-Marie Wernholt. "Att möta elever med DAMP." Thesis, Linköping University, Department of Educational Science (IUV), 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-978.

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Syftet med detta arbete är att genom litteraturstudier och empirisk undersökning ta reda på hur lärare på bästa sätt kan underlätta för DAMP-barn i skolan. Arbetet börjar med en litteraturgenomgång där det först beskrivs vad DAMP innebär. Vidare tas de svårigheter upp som DAMP-barn kan ha och vilka problem som kan möta dem i skolan. I litteraturgenomgången går också att läsa om det ansvar skolan har gentemot DAMP-barn och hur den enskilda läraren på bästa sätt kan anpassa sin undervisning för dessa barn. De olika metodiska grepp somtas upp inbegriper både allmänna åtgärder och mer specifika undervisningsmetoder såsom särskild undervisningsgrupp eller särskilt anpassat undervisningsmaterial. Teoridelen innefattar även fakta som rör föräldrasamverkan. Den kunskap som lärare besitter undersöks dels genom teoretiska studier, men framförallt genom intervjuer med tre olika lärare. Genom dessa studier framkommer bland annat att DAMP-barn har ett stort behov av struktur i sin vardag. De behöver också tydlighet i undervisningen samt möjlighet till arbete i lugn och ro. Det finns inga bestämda mönster för hur DAMP-barnet ska bemötas eftersom varje barn är en särskild individ med särskilda behov. Grunden för allt arbete med DAMP-barn är dock uppbyggelse av barnens självförtroende samt att vara en vuxen som förstår och som har förmågan att visa barnen mycket kärlek.

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Andersson, Karl-Johan, and Johnny Karlsson. "DAMP och synen på lärande." Thesis, Örebro University, Department of Education, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-147.

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Den här uppsatsen handlar om dampdiagnostisering av barn i skolan. Denna debatt har under flera år varit intensiv och tidvis ganska infekterad. Flera forskare beskriver DAMP som ett stort folkhälsoproblem där så många som 5 % av vårt lands barn och ungdomar har symtom som kan leda till en diagnos. Detta innebär i så fall att det finns ungefär ett barn i varje klass som lider av detta, ett problem som i många fall dessutom fortsätter upp i vuxen ålder. Samtidigt finns det personer som kraftigt motsätter sig diagnoser och menar att framförallt DAMP är rena påhittet. En diagnos på ett barn, menar dessa, är detsamma som att stämpla denne för resten av livet

Uppsatsen har genomgående två spår, det medicinska/biologiska och det sociokulturella/ sociologiska och syftet är att se hur förespråkare för de olika perspektiven argumenterar för sina ståndpunkter. Utifrån detta vill vi också undersöka om, och i så fall hur, synen på lärande och arbetssättet skiljer sig åt beroende på vilket perspektiv läraren har på DAMP och dess orsaker. Som ett komplement till detta har vi också valt att se hur debatten speglas i media. Anledningen till detta är att tidningarnas debattsidor är en av de största opinionsbildarna idag och många uppfattningar och åsikter formas genom det som tas in genom media.

En första slutsats är att det finns en stor och väldigt viktig skillnad i synen på lärande utifrån de båda synsätten. Det medicinska perspektivet utgår från att barnet har någon form av brist. Det sociokulturella perspektivet utgår istället från att varje individ är unik och att alla kan lära. Det medicinska perspektivet menar att situationen för ett barn med DAMP kan underlättas, men denne kan aldrig bli fri från sitt ”handikapp”. Det sociokulturella perspektivet menar att det är barnens sociala och kulturella omgivning som formar dem till vad de är. Arbetssättet för oss som lärare i arbetet med barn med DAMP blir utifrån detta väldigt annorlunda beroende på vilket synsätt som gäller. Utgår man från det medicinska perspektivet innebär detta att ansvaret för dessa barn till stor del skjuts över på specialpedagoger och stödpersonal. Eleverna särskiljs från gruppen och placeras i specialklasser och får individuell undervisning. Om det sociokulturella perspektivet anammas blir arbetssättet ett helt annat. Detta innebär då att alla elever skall få plats i samma klassrum och erbjudas undervisning utifrån sina förutsättningar. Den ordinarie läraren har allt ansvar och varje enskild lärare skall kunna hantera denna situation.

När det gäller mediedebatten innehåller inte den någon egentlig sakinformation. Debatten mellan i första hand Christofer Gillberg och Eva Kärfve hamnar mer på personangreppsnivå. Risken är då att läsarna bildar sin uppfattning utan att egentligen vara särskilt insatt i ämnet. Utifrån den typen av debatt vi har sett anser vi att den kan göra mer skada än nytta. Det riskerar att bli väldigt polariserat, antingen håller man på Gillberg eller också håller man på Kärfve, svart eller vitt.

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29

Andersson, Emelie. "Debatten om DAMP : en kontroversstudie." Thesis, Stockholm University, Department of Social Work, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-408.

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Uppsatsens syfte var att belysa och analysera debatten om DAMP. De frågeställningar som skulle besvaras i uppsatsen var:

· Hur ser kontroversens utveckling ut?

· Hur kan kontroversen förklaras med hjälp av kontroversteorin?

För att uppnå detta syfte och besvara frågeställningarna har artiklar om DAMP-debatten som publicerats i dagspress, specialpress eller fackpress analyserats och tolkats med hjälp av kontroversteorin. Debatten har studerats diakront (som en process över tid; utvecklingen mellan 2000 och 2004) och synkront (sociala, teoretiska och psykologiska faktorer som påverkat debatten har analyserats). Undersökningens resultat visade bland annat att DAMP-kontroversen har uppkommit på grund av oenighet angående fenomenet DAMPs natur och orsaker, samt kombattanternas olika vetenskapliga utgångspunkter och den påverkan teori och tidigare erfarenheter har på forskarens perception och tolkning. Resultaten visade dessutom att forskarnas ställningstagande i debatten kan bero på externa faktorer, såsom ideologisk och ekonomisk påverkan, samt inverkan från socialpsykologiska faktorer.

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30

Thackray, Anne. "The Mays of Notre Dame." Thesis, Courtauld Institute of Art (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272103.

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31

Reader, Daniel Martin. "Nonlinear Mr Model Inversion for Semi-Active Control Enhancement With Open-Loop Force Compensation." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32660.

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Анотація:
The increased prevalence of semi-active control systems is largely due to the emergence of cost effective commercially available controllable damper technology such as Magneto-Rheological (MR) devices. Unfortunately, MR dampers exhibit highly nonlinear behavior, thus presenting an often over-looked complexity to the control system designer. With regards to controlling dampers, the well-known Skyhook Damping control algorithm has enjoyed great success for both fully active and semi-active control problems. The Skyhook design strategy is to create a control force that emulates what a passive linear damper would create when connected to an inertial reference frame. Skyhook control is device independent since it generates a desired control force command output that must be produced by the control system.

For simplicity, MR dampers are often assumed to have a linear relationship between the current input and the force output at a given relative velocity. Often this assumption is made implicitly and without knowledge of the underlying nonlinearity. This thesis shows that the overall performance of a semi-active Skyhook control system can be improved by explicitly inverting the nonlinear relationship between input current and output force. The proposed modification will work with any semi-active control algorithm, such as Skyhook, to insure that the controller performance is at least as good as the performance without the proposed modification. This technique is demonstrated through simulation on a quarter-vehicle system. Hysteretic damping effects are incorporated into the modification by application of simple open loop force compensation. Laboratory testing of the hysteretic inversion process was performed with the goal of emulating an ideal linear damper without hysteresis. These results are compared with the implicit assumption thus providing a basis for validating the benefits of the improved methodology.
Master of Science

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32

Marko, Julius. "Influence of damping systems on building structures subject to seismic effects." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16318/.

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In order to control the vibration response of high rise buildings during seismic events, energy absorbing passive damping devices are most commonly used for energy absorption. Today there are a number of types of manufactured dampers available in the market, which use a variety of materials and designs to obtain various levels of stiffness and damping. Some of these include friction, yielding, viscoelastic and viscous dampers. These dampers are usually installed between two load bearing elements (walls or columns) in new buildings. In existing buildings, which require retrofitting, they could be installed in cut-outs of shear walls, as evidenced from recent investigations. An effective damping system can result in higher levels of safety and comfort, and can also lead to considerable savings in the total cost of a building. This thesis treats seismic mitigation of multistorey buildings using embedded dampers. Three types of damping mechanisms, viz, friction, viscoelastic, and combined friction-viscoelastic were investigated. Finite element methods were employed in the analysis using the program ABAQUS version 6.3. A direct integration dynamic analysis was carried out to obtain the damped and undamped responses of the structure in terms of deflections and accelerations at all storeys in order to evaluate the effectiveness of the damping system in mitigating the seismic response. The damping mechanisms have been modelled as (i) a linear spring and dash-pot in parallel for the viscoelastic damper, (ii) a contact pair with friction parameter for a friction damper and (iii) a hybrid damper consisting of both a viscoelastic and a friction damper. The earthquake events used in this study have been applied as acceleration time-histories at the base of the structure in the horizontal plane. Concrete material properties were chosen to represent the model as many high-rise buildings are constructed by using reinforced concrete. Several medium and high-rise building structures with embedded dampers in different configurations and placed in various locations throughout the structure were subjected to different earthquake loadings. Influence of damper type and properties, configuration and location were investigated. Results for the reduction in tip deflection and acceleration for a number of cases demonstrate the feasibility of the technique for seismic mitigation of these structures for a range of excitations, even when the dominant seismic frequencies match the natural frequency of the structure. Results also provide information which can be used for optimal damper placement for seismic mitigation.
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33

Ertas, Bugra Han. "Rotordynamic force coefficients of pocket damper seals." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2592.

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The present work describes experiments conducted on several pocket damper seal (PDS) designs using a high pressure annular gas seal test rig. Both rotating and non-rotating tests were conducted for a 12, 8, and 6 bladed PDS. The objective of the tests was to determine the rotordynamic force coefficients and leakage for the different PDS while varying parameters such as: (1) clearance ratio, (2) rotor surface speed, (3) PDS pressure differential, and (4) excitation frequency. Two different methods were used to determine frequency dependent force coefficients: (1) the impedance method, which involved using a baseline subtraction and (2) the dynamic pressure response method, which comprised of measuring seal cavity dynamic pressure and phase relationship to vibration. Both methods were used to determine coefficients, but the dynamic pressure response method revealed insights to the dynamics of the PDS that were the first of its kind and allowed the comparison to the damper seal theory at the most fundamental of levels. The results indicated that the conventional PDS possessed high positive damping, negative and positive stiffness, and same sign cross-coupled coefficients. Another objective of the work is to investigate a new fully partitioned PDS design and accompany experimental results with the development of a modified damper seal theory. The new fully partitioned PDS design was shown to give twice as much damping as the conventional design and revealed the ability to modify direct stiffness without degradation in direct damping. Finally, both the conventional theory and the newly proposed theory predictions are compared to experimentally determined force coefficients. The last objective was to evaluate the leakage characteristics of the different designs and to investigate the effect of blade profile on seal leakage. Results showed that beveled tooth blade profiles yield higher mass flow leakage compared to rectangular blade profiles.
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34

Sambuc, Clément. "Refined damped equivalent fluid models for acoustics." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209144.

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The acoustics of small cavities raises interest of the scientific community since it involves particular damping mechanisms. In fluid dynamics, when a small perturbation is propagating within a Newtonian and heat-conducting fluid bounded by a rigid and isothermal surface, viscous and thermal dissipative mechanisms are generated near the walls. Such effects can have significant impact on the acoustic behaviour of the system.

Several types of practical applications can be cited, among which: hearing aids, micro-electro-mechanical systems (transducers, microphones and loud-speakers), absorbing materials made of thin capillary nets or small pores, dissipative silencers, thermo-acoustic heat exchangers, or any kind of device bringing into play small resonant cavities filled with a dissipative fluid (micro-acoustics).

This study focuses on appropriated reductions of the physical equations, in order to enhance the efficiency of the numerical resolution without adversely affecting the accuracy. Moreover, the proposed strategies lead to numerically stable systems as they involve only one scalar partial order differential equation (or equivalent fluid equation). The emphasis is put on the physical aspect of those reductions, their range of applicability, benefits and drawbacks.

Two new reduced models are proposed to estimate the visco-thermal acoustic wave propagation. A first extension deals with waveguide geometries and relax the hypothesis of the fluid at rest. The second original formulation addresses visco-thermal acoustics in 3D arbitrary geometries. This model is based on different considerations coming from existing techniques as well as the estimation of a wall-distance field.

A second part aims at studying the acoustic behaviour of biphasic materials and more specifically poro-elastic materials. This type of acoustic component is widely used in industry because of their good absorbing properties in the medium- and high-frequency

ranges.

A preliminary bibliographic research deals with the derivation of the set of partial order differential equations that account for both fluid/structure interactions and the anisotropy of a given poro-elastic material. It has been shown that transversely orientated capillary materials (for instance catalyst substrates) can be simulated using the proposed reduction technique.

At last, the modelling of the acoustic transmission between two domains separated by perforated or micro-perforated plates or thin plates of poro-elastic materials is discussed. The analogy between the rigid perforated plate models with an equivalent fluid formulation has been presented. As a result, this model has been extended in order to account for flexural effects of the solid part.

Ce travail porte sur l'étude de certains phénomènes d'amortissements intervenant dans l'acoustique des petites cavités. En méchanique des fluides, lorsqu'une petite perturbation se propage au sein d'un fluide newtonien et caloporteur borné par un mur rigide et isotherme, ces mécanismes dissipatifs particuliers se localisent aux abords des parois et jouent un rôle significatif dans certaines situations.

Parmi les exemples d'applications pratiques, il est possible de citer les appareils d'aide auditive, les systèmes microélectromécaniques (transducteurs, microphones et haut-parleurs), les matériaux absorbants constitués de fins réseaux capillaires ou de pores aux dimensions réduites, les systèmes de silencieux, d'échangeurs de chaleur thermo-acoustiques ou tout autre appareil mettant en jeu des cavités résonantes aux dimensions réduites (micro-acoustique).

L'étude proposée ici se focalise sur des stratégies de réduction appropriées des équations physiques, ceci afin d'améliorer l'efficacité du modèle tout en conservant une précision acceptable. Les techniques présentées aboutissent à des systèmes numériquement stables mettant en jeu une seule équation scalaire (ou équation fluide équivalent). Ainsi, l'accent est porté sur l'aspect physique des réductions, leurs domaines d'application, avantages et inconvénients.

Deux modèles originaux sont proposés afin de prédire la propagation acoustique visco-thermique. Une première extension permet d'évaluer la pression acoustique au sein de géométries particulières de type guides d'onde en présence d'un écoulement hydrodynamique. La seconde formulation présentée s'intéresse à l'acoustique dans des domaines 3D arbitraires. Cette méthode se base sur des considérations conjointes de modèles réduits existants ainsi que sur l'estimation d'un champ de distance à la plus proche paroi.

Dans une seconde partie, nous nous proposons d'étudier le comportement acoustique de matériaux biphasique et plus précisément les matériaux poro-élastiques (très utilisés dans l'industrie en raison de leurs caractéristiques absorbantes dans les domaines des moyennes et hautes fréquences).

Une étude bibliographique préliminaire nous a permis d'exprimer l'ensemble des équations aux dérivées

partielles modélisant à la fois les interactions fluide/structure et l'anisotropie générale des matériaux.

Cette réflexion nous a permis d'aboutir à un modèle de matériau isotrope transverse intéressant, combinant le modèle fluide proposé et la formulation acousto-élastique équivalente. Ainsi la modélisation de structures capillaires orientées (comme les matériaux utilisés dans les catalyseurs automobiles) s'en trouve grandement simplifiée.

Enfin, la transmission acoustique intervenant entre deux domaines fluides séparés par une plaque perforée ou micro-perforée ou bien une couche de matériau poreux a été étudiée. L'analogie entre les modèlisations existantes et un modèle générique de fluide équivalent a été mise en évidence. Pour finir, cette formulation a été étendue afin de prendre en compte les effets de flexion de la partie solide.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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35

Dynge, Martin Steen-Nilsen. "Subsea Permanent Magnet Motor with Damper winding." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27238.

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Анотація:
Permanent Magnet (PM) machines can have difficulties dealing with unstable loads, which in worst case can make the machine to step-out of synchronous speed. This problem can be avoided by equipping the rotor with damper windings. During load variation the damper winding will induce a torque to dampen the impact of the load variation. To investigate the effects from using damper windings a numerical model of a PM machine was developed and studied in this thesis. The model is intended to operate with regards to load torque and the stator field. The stator configuration which was used in this thesis is very complex, which resulted in a lot of trial and error. Due to the complexity of the stator meant it had to be applied with a current density, which means that the voltage over the phases was not taken into account during the simulations. This simplification appears to have created an unnatural damping factor in the simulations.Simulations show that a high-conductive damper winding performs faster during load variations then a low conductive damper winding. The reason for this is that a low resistance will induce a high torque at low slip. The size of the windings also affects the performance but these are small and difficult to notice. Simulations show that the size of the damper winding should be between 5-10% of the size of the stator winding.
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36

Nayfeh, Samir Ali 1970. "Design and application of damped machine elements." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9972.

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37

Licona, Núñez Miguel José. "Design sensitivity of highly damped structural systems." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47414.

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Анотація:
Thesis (Civ. E.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
Includes bibliographical references (leaf 83).
by Miguel José Licona Núñez.
Civ.E.
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38

Rao, Nimisha 1979. "Real time tuned mass damper simulation system." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/85733.

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39

Naylor, S. "Non-proportionally damped structures using force appropriation." Thesis, University of Manchester, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680135.

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40

Jorgenson, Regina A. "Physical conditions in Damped Lyman alpha Systems." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3320113.

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Анотація:
Thesis (Ph. D.)--University of California, San Diego, 2008.
Title from first page of PDF file (viewed September 12, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 228-236).
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41

Ingram, Douglas Russell. "Starlight correlated with damped Lyman alpha absorbers /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5435.

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42

Chochua, Gocha. "Computations of gas annular damper seal flows." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000115.

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Анотація:
Thesis (Ph. D.)--University of Florida, 2002.
Title from title page of source document. Document formatted into pages; contains xix, 103 p.; also contains graphics. Includes vita. Includes bibliographical references.
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43

Eroglu, Mehmet Ali. "Observer based control of an magnetorheological damper." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4520/.

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Magnetorheological (MR) fluids enable the rapid and continuous alteration of flow resistance via the application of a magnetic field. This unique characteristic can be utilised to build semi-active dampers for a wide variety of vibration control systems, including structural, automotive, and bridge applications. However, the non-linear behaviour of smart fluid dampers makes the objective of achieving a desired control force very difficult. Most of the control algorithms proposed to overcome this problem require the measurement of both the MR damper force and the states of the system, which increases the complexity of the system. In this thesis, this problem is overcome by developing a non-linear observer. A further aim of this thesis is to investigate the effective control techniques for broadband excited observer-based MR vibration systems. Through an extensive series of numerical and experimental investigations, the general single-degree-of-freedom and tuned mass damper problems are presented. In an experimental case study, the hardware-inthe-loop-simulation method is adopted, which provides an excellent means to bridge the gap between theory and practice when the behaviour of a specific component is complex. Here, the vibration absorber with controllable MR damper is physically tested, whilst the remainder of the structure is simulated in real-time. The results demonstrate that the chosen control strategy can provide significant performance benefits when compared to more commonly used strategies and equivalent passive systems.
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44

Zhao, Xianfeng. "Interpolation of transfer functions for damped vibrating systems." Thesis, Boston University, 2004. https://hdl.handle.net/2144/33606.

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Thesis (Ph.D.)--Boston University
PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
This thesis presents methods for interpolating transfer functions of damped vibrating systems. Primary applications lie in the design and control of damped structures. The interpolations reduce the number of frequencies at which the transfer function must be computed or measured. The transfer functions are assumed to have impulse responses that are real-valued and causal, so a method is developed for constructing interpolations that implicitly satisfy these conditions. The method is applied to a particular choice of basis function that corresponds to a Fourier series in the time domain. Numerical results indicate that satisfaction of the causality condition increases the accuracy of the interpolation. A detailed investigation is made into interpolations for viscously damped systems, whose transfer functions are linear combinations of basis functions derived from the complex-valued eigenpairs of the system. Since the estimation of all eigenpairs is computationally expensive, a method is developed to estimate only those eigenpairs that significantly contribute to the transfer function in the specified frequency band. The method uses eigenvalues of the corresponding undamped system, which are much easier to compute, as starting guesses in an iterative algorithm. One advantage of the method is the assurance that it finds all eigenvalues in a specified region of the complex plane.
2031-01-01
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45

Gravatt, John Wilie. "Magneto-Rheological Dampers for Super-sport Motorcycle Applications." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33022.

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In recent years, a flurry of interest has been shown for a relatively old technology called magneto-rheological fluids, or MR fluids. Multiple types of devices have been designed to implement this versatile fluid, including linear dampers, clutches, work-piece fixtures, and polishing machines. The devices have been used in automobiles, washing machines, bicycles, prosthetic limbs, and even smart structures. This thesis focuses on another application of MR dampers, involving super-sport motorcycles. This paper introduces the topics of MR dampers and motorcycle suspensions, and why the two would be a good combination. A detailed history of MR fluids, MR dampers, and motorcycle suspension technologies is given next. After a broad outline of MR dampers and motorcycle suspensions, the method of designing and manufacturing MR dampers is discussed. The damper design for this research is presented in detail, along with the design procedure used to make it. Next, laboratory testing for it is covered, including the test equipment, test procedure, and the laboratory test results. Upon laboratory test completion, the field test setup and procedure are presented. The results of field tests with stock dampers and MR dampers with a variety of control systems is discussed. The MR dampers provided a more stable ride than that of the OEM dampers. By reducing suspension displacement, settling time, and suspension oscillations, the MR dampers were able to reduce suspension geometry instability. Lastly, concluding remarks are made on the research presented. Design flaws are discussed, as well as recommendations for future work in the same area.
Master of Science
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46

Marko, Julius. "Influence of damping systems on building structures subject to seismic effects." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16318/1/Julius_Marko_Thesis.pdf.

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In order to control the vibration response of high rise buildings during seismic events, energy absorbing passive damping devices are most commonly used for energy absorption. Today there are a number of types of manufactured dampers available in the market, which use a variety of materials and designs to obtain various levels of stiffness and damping. Some of these include friction, yielding, viscoelastic and viscous dampers. These dampers are usually installed between two load bearing elements (walls or columns) in new buildings. In existing buildings, which require retrofitting, they could be installed in cut-outs of shear walls, as evidenced from recent investigations. An effective damping system can result in higher levels of safety and comfort, and can also lead to considerable savings in the total cost of a building. This thesis treats seismic mitigation of multistorey buildings using embedded dampers. Three types of damping mechanisms, viz, friction, viscoelastic, and combined friction-viscoelastic were investigated. Finite element methods were employed in the analysis using the program ABAQUS version 6.3. A direct integration dynamic analysis was carried out to obtain the damped and undamped responses of the structure in terms of deflections and accelerations at all storeys in order to evaluate the effectiveness of the damping system in mitigating the seismic response. The damping mechanisms have been modelled as (i) a linear spring and dash-pot in parallel for the viscoelastic damper, (ii) a contact pair with friction parameter for a friction damper and (iii) a hybrid damper consisting of both a viscoelastic and a friction damper. The earthquake events used in this study have been applied as acceleration time-histories at the base of the structure in the horizontal plane. Concrete material properties were chosen to represent the model as many high-rise buildings are constructed by using reinforced concrete. Several medium and high-rise building structures with embedded dampers in different configurations and placed in various locations throughout the structure were subjected to different earthquake loadings. Influence of damper type and properties, configuration and location were investigated. Results for the reduction in tip deflection and acceleration for a number of cases demonstrate the feasibility of the technique for seismic mitigation of these structures for a range of excitations, even when the dominant seismic frequencies match the natural frequency of the structure. Results also provide information which can be used for optimal damper placement for seismic mitigation.
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47

Hermansson, Katarina, and Christian Tidebrink. "DAMP-diagnosens vara eller inte vara? : En intervjustudie om pedagogers uppfattning och inställning till diagnosen DAMP." Thesis, Linköping University, Department of Social and Welfare Studies, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7390.

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Uppsatsen belyser diagnosen DAMP ur ett pedagogperspektiv. Diagnosen har debatterats i medierna och det har framkommit företrädare för två olika ståndpunkter. En av dem är docenten i sociologi, Eva Kärfve och den andra är professorn i neuropsykiatri samt en av grundarna till diagnosen DAMP, Christopher Gillberg. Kärfve ville granska dennes forskning då hon ifrågasätter dess trovärdighet. Debatten gjorde att vi blev intresserade av DAMP-diagnosen och ville undersöka vilken uppfattning pedagogerna har om DAMP och dess diagnostisering, samt vad de vet om utredningen som leder till en diagnos och hur de uppfattar den pågående debatten i media.

För att belysa dessa frågeställningar har vi studerat litteratur som behandlar problematiken kring diagnosen DAMP, samt genomfört en empirisk undersökning. Vi genomförde denna genom kvalitativa intervjuer med pedagoger.

Vår undersökning visade att pedagogerna hade olika uppfattning kring diagnosen betydelse. En del pedagoger ansåg att diagnosen följde individen genom hela livet medan andra ansåg att den kunde förändras med tiden. Vidare menade några pedagoger att det var barnet som var bärare av problematiken, medan andra ansåg att problematiken förmodades ligga i skolmiljön och pedagogens bemötande. Även om pedagogen menade att problematiken låg i skolmiljön, benämnde de ändå barnet som barnet med bekymmer eller med problem. De pedagoger som arbetade i mindre klasser med barn som fått diagnosen DAMP ansåg att det var bra med denna exkludering. Detta på grund av att de kunde hjälpa barnet att på ett bättre sätt tillgodogöra sig skolans undervisning. Hos dessa pedagoger låg ändå strävan att få eleverna med diagnos inkluderade i vanlig klass. Vad pedagogerna visste om utredningen och diagnostiseringen av DAMP varierade. Pedagoger i vanlig klass och fritidspedagoger hade inte särskilt stor insikt i hur utredningen till diagnosen gått till. Däremot hade rektorn, specialpedagogerna och speciallärarna större kunskap om detta. Detta kan bero på att dessa pedagoger är mer delaktiga vid utredning och diagnostisering.

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48

Shi, Yuan Feng. "Reliability-based semi-active control using MR damper." Thesis, University of Macau, 2004. http://umaclib3.umac.mo/record=b1445126.

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49

Ciornei, Mihaela-Cristina. "Role of magnetic inertia in damped macrospin dynamics." Phd thesis, Palaiseau, Ecole polytechnique, 2010. http://pastel.archives-ouvertes.fr/pastel-00006013/en/.

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50

McLawhorn, Tracy Elizabeth. "A Critical Edition of Donne's "The Indifferent," "Love's Usury," "The Will," "The Funerall," "The Primerose," and "The Dampe" and a Digital Edition of "To his Mistress Going to Bed"." Thesis, 2013. http://hdl.handle.net/1969.1/149398.

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This dissertation presents an edition of six poems from John Donne’s Songs and Sonets—“The Indifferent,” “Love’s Usury,” “The Will,” “The Funerall,” “The Primerose,” and “The Dampe”—and a digital edition of one additional poem, “To His Mistress Going to Bed.” Using the methodologies of The Variorum Edition of the Poems of John Donne, I have also adopted the edition’s principal goal—to recover and present Donne’s exact texts to the extent that this is possible. For each poem, I have selected a copy-text and emended it in accordance with the Variorum’s principles. A textual introduction for each poem explains how the copy-text was chosen and traces the circulation of the text in all seventeenth-century artifacts. I have also provided a textual apparatus for each poem, which, in addition to recording the texts collated, emendations to the copy-text, imperfections in the sources, and indentation patterns in the sources, also notes all verbal variants and variants of punctuation. Finally, I have created a stemma charting the transmissional history for each poem and giving a visual representation of how the textual artifacts relate to each other. The other major component of my dissertation, a digital edition of “To His Mistress Going to Bed,” is meant to serve as a prototype for what might usefully be done with Donne’s poems in a digital medium. While the actual digital edition of this poem cannot be fully represented on paper, my chapter on this edition outlines the process I used to create it and describes its major features. The digital edition itself can be found at .
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