The familiar essay in American literature

Thesis (M.A.)--Boston Universit

Study of incomplete models of dynamic structures

Incomplete models of dynamic structure

Identification of structural parameters from helicopter dynamic test data

A method is presented for obtaining the mass, stiffness, and damping parameters of a linear mathematical model, having fewer degrees of freedom than the structure it represents, directly from dynamic response measurements on the actual helicopter without a priori knowledge of the physical characteristics of the fuselage. The only input information required in the formulation is the approximate natural frequency of each mode and mobility data measured proximate to these frequencies with sinusoidal force excitation applied at only one point on the vehicle. The practicality and numerical soundness of the theoretical development was demonstrated through a computer simulation of an experimental program

Elizabeth Ann Seton: Model of Contemplative Presence for the 21st Century

Jean Flannelly asserts that Elizabeth Seton was a mystic, although she probably would not have seen herself that way. Elizabeth’s worldview differed from ours, but she can still serve as a model for us. She was “fascinated with God” and found his presence in the Church, especially in the eucharist, in her suffering, and in people. To “gain deeper insight into her words, admonitions, and interiority,” Flanelly examines the influence of the Bible, The Imitation of Christ, the liturgy, and the writings of Francis de Sales on Elizabeth’s “religious imagination.” Flannelly also explores what Elizabeth might have us do to become closer to God. She would particularly want us to see the divine in ordinary life. The contemporary theological understanding of mysticism and its application to Elizabeth are explained

Application of antiresonance theory to helicopters

Antiresonance theory is the principle underlying nonresonant nodes in a structure, and covers both nonresonant nodes occurring naturally and those introduced by devices such as dynamic absorbers and antiresonant isolators. The dynamic antiresonant vibration isolator (DAVI) and the nodale module are examples of the applications of transfer antiresonances. It is shown that antiresonances are eigenvalues, and that they can be determined by matrix iteration. Applications of antiresonance theory to helicopter engineering problems, using the antiresonant eigenvalue equation are suggested

Rotor dynamic simulation and system identification methods for application to vacuum whirl data

Methods of using rotor vacuum whirl data to improve the ability to model helicopter rotors were developed. The work consisted of the formulation of the equations of motion of elastic blades on a hub using a Galerkin method; the development of a general computer program for simulation of these equations; the study and implementation of a procedure for determining physical parameters based on measured data; and the application of a method for computing the normal modes and natural frequencies based on test data

Analytical testing

Analytical methods for combining flight acceleration and strain data with shake test mobility data to predict the effects of structural changes on flight vibrations and strains are presented. This integration of structural dynamic analysis with flight performance is referred to as analytical testing. The objective of this methodology is to analytically estimate the results of flight testing contemplated structural changes with minimum flying and change trials. The category of changes to the aircraft includes mass, stiffness, absorbers, isolators, and active suppressors. Examples of applying the analytical testing methodology using flight test and shake test data measured on an AH-1G helicopter are included. The techniques and procedures for vibration testing and modal analysis are also described

Young Adult Fiction: Inside the Mirror Image

Identity and image-of-self are concepts intertwined throughout the pages of Young Adult Fiction Literature. Characters in Young Adult Fiction interact with their surroundings and as a result form an identity based on these interactions. Research has shown how young adults respond to the feedback of their surroundings whether embodied by other characters or their environment. The way in which identity and the image characters see in the mirror are formed is directly related to the interactions characters experience in their daily lives. Interactions with landscapes, peers, illness, grief, and parents are the specific interactions discussed in this thesis. The novels All the Bright Places, The Fault in Our Stars, and The Boyfriend List provide characters who exhibit these identity-constructing interactions and fashion their identities based on the unique experiences with these interactions

Analytical research on a synchronous gyroscopic vibration absorber

Synchronous gyroscopic vibration absorbe