Research requirements for the reduction of helicopter vibration

All prospective approaches to the reduction of helicopter vibrations were searched to establish insight for the planning of a corrective research program. The state of the art as revealed in the literature is summed up and followed by a discussion of state-of-the-art solutions and of identified technological gaps. It is applicable to all helicopters without regard to size. Extending the historic trend toward lower vibration levels will require the successful application of principles which isolate the fuselage from the rotor systems. Simplicity of the necessary isolation systems should be facilitated by providing other refinements of the dynamic design of the system

Thermoelastic Formulation of a Hypersonic Vehicle Control Surface for Control-Oriented Simulation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77320/1/AIAA-2009-6284-394.pd

Canard-Elevon Interactions on a Hypersonic Vehicle

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/83564/1/AIAA-44743-762.pd

Canard-Elevon Interactions on a Hypersonic Vehicle

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76433/1/AIAA-2008-6383-356.pd

Do Plans and Execution Agree in a Humanitarian Medical Mission?

There is a significant need for orthopaedic care in developing countries. Fo

Long-Term Health Risks for Children and Young Adults after Infective Gastroenteritis

TOC Summary: Prior episodes increase risk for long-term adverse health effects

Dynamic linkages between stock markets : the effects of crises and globalization

This paper investigates changes in the dynamics of linkages between selected national stock markets during the period 1995–2009. The analysis focuses on the possible effects of globalization and differences between crisis and non-crisis periods. We model the dynamics of dependencies between the series of daily returns on selected stock indices over different time periods, and compare strength of the linkages. Our tools are dynamic copula models and a formal sequential testing procedure based on the model confidence set methodology. We consider two types of dependencies: regular dependence measured by means of the conditional Spearman’s rho, and dependencies in extremes quantified by the conditional tail dependence coefficients. The main result consists of a collection of rankings created for the considered subperiods, which show how the mean level of strength of the dependencies have been changing in time. The rankings obtained for Spearman’s rho and tail dependencies differ, which allows us to distinguish between the results of crises and the effect of globalization.info:eu-repo/semantics/publishedVersio

Design and manufacture of a bed supported tidal turbine model for blade and shaft load measurement in turbulent flow and waves

Laboratory testing of tidal turbine models is an essential tool to investigate hydrodynamic interactions between turbines and the flow. Such tests can be used to calibrate numerical models and to estimate rotor loading and wake development to inform the design of full scale machines and array layout. The details of the design and manufacturing techniques used to develop a highly instrumented turbine model are presented. The model has a 1.2 m diameter, three bladed horizontal axis rotor and is bottom mounted. Particular attention is given to the instrumentation which can measure streamwise root bending moment for each blade and torque and thrust for the overall rotor. The model is mainly designed to investigate blade and shaft loads due to both turbulence and waves. Initial results from tests in a 2 m deep by 4 m wide flume are also presented