2,139 research outputs found
Experimental methodologies to support aircraft icing analysis
The experimental methodologies are illustrated by graphs, charts and line drawings. Typical ultrasonic echo signals for dry and wet ice growth, ice accretion rates for various tunnel configurations, the experimental configuration for flight tests of the ultrasonic measuring system and heat balance models used to predict ice growth are among the topics that are illustrated and briefly discussed
Experimental measurements of heat transfer from an iced surface during artificial and natural cloud icing conditions
The heat transfer behavior of accreting ice surfaces in natural (flight test) and simulated (wind tunnel) cloud icing conditions were studied. Observations of wet and dry ice growth regimes as measured by ultrasonic pulse echo techniques were made. Observed wet and dry ice growth regimes at the stagnation point of a cylinder were compared with those predicted using a quasi steady state heat balance model. A series of heat transfer coefficients were employed by the model to infer the local heat transfer behavior of the actual ice surfaces. The heat transfer in the stagnation region was generally inferred to be higher in wind tunnel icing tests than in natural flight icing conditions
Translatory shock absorber for attitude sensors
A translatory shock absorber is provided for mounting an attitude sensor thereon for isolating a sensor from translatory vibrations. The translatory shock absorber includes a hollow block structure formed as one piece to form a parallelogram. The absorber block structure includes a movable top plate for supporting the attitude sensor and a fixed base plate with opposed side plates interposed between. At the junctions of the side plates, and the base and top plates, there are provided grooves which act as flexible hinges for attenuating translatory vibrations. A damping material is supported on a pedestal which is carried on the base plate between the side plates thereof. The top of the damping material rests against the bottom surface of the top plate for eliminating the resonant peaks of vibration
Ultrasonic techniques for aircraft ice accretion measurement
Results of tests to measure ice growth in natural (flight) and artificial (icing wind tunnel) icing conditions are presented. Ice thickness is measured using an ultrasonic pulse-echo technique. Two icing regimes, wet and dry ice growth, are identified and the unique ultrasonic signal characteristics associated with these different types of ice growth are described. Ultrasonic measurements of ice growth on cylinders and airfoils exposed to artificial and natural icing conditions are presented. An accuracy of plus or minus 0.5 mm is achieved for ice thickness measurement using the pulse-echo technique. The performance of two-probe type ice detectors is compared to the surface mounted ultrasonic system. The ultrasonically measured ice accretion rates and ice surface condition (wet or dry) are used to compare the heat transfer characteristics for flight and icing wind tunnel environments. In general the heat transfer coefficient is inferred to be higher in the wind tunnel environment, not likely due to higher freestream turbulence levels. Finally, preliminary results of tests to measure ice growth on airfoil using an array of ultrasonic transducers are described. Ice profiles obtained during flight in natural icing conditions are shown and compared with mechanical and stereo image measurements
Tennessee Labor Decisions: 1901-1954
Any survey of a state\u27s decisional law in the labor field should include some reference to the jurisdiction of its courts over labor controversies. There would be no separate body of substantive labor law but for the intervention of Congress into employment relations affecting interstate commerce with comprehensive legislation designed to strengthen the worker in his collective capacity.\u27 The administration of this legislation by the National Labor Relations Board provides the great majority of case law governing the employment relationship. However, that residue which may be regulated exclusively or concurrently by the states is an important one, as evidenced by the number of states which have enacted their own labor relations acts
Constitutional Law -- 1962 Tennessee Survey
I. Delegation of Legislative Power to Metropolitan Charger Commission
II. Right to Jury Trial: Special Findings Without General Verdict
III. Due Process of Law: In Personam Jurisdiction Over Nonresident Individual
IV. Due Process: Expulsion from Public University Without Hearing
V. Equal Protection: Legislative Apportionment
VI. Legislative Classification: Suspension of General Law for One County
VII. Legislative Classification: Exemption from Carrier Regulation
VIII. Equal Protection: Racial Discrimination
IX. Standing to Challenge Constitutionalit
The Annual Net Primary Production and Decomposition of the Salt Marsh Grass, Spartina Alterniflora, Loisel. In the Barataria Bay Estuary of Louisiana.
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