Shock absorbing support and restraint means Patent

Shock absorbing couch for body support under high acceleration or deceleration force

Analysis of Multiengine Transport Airplane Fire Records

An analysis has been made of Civil Aeronautics Administration and Civil Aeronautics Board commercial airplane fire records collected during the 10-year period ending July 1, 1948. The results of the analysis show that: 1. Gasoline was most frequently the initial combustible ignited in flight and ground fires and is considered to be the most hazardous of the combustibles carried. 2. Although electrical-ignition sources are the most frequent flight-fire ignition source by a small margin, the exhaust system is concluded to be the most hazardous ignition source because it is necessarily located near the lubricating-oil and gasoline-plumbing systems and the resulting fires are relatively severe. The electrical-ignition sources usually involve only the electrical insulation and result in small-volume fires. The exhaust system was found to be the most frequent ground-fire ignition source. 3. Engine failures were the most frequent cause of the union of combustible and ignition source that resulted in flight fires. 4. Fuel-plumbing-system failures were the most frequent cause of fires occurring during ground operation. 5. The evidence concerning crash fires was not sufficiently extensive to provide information concerning the factors that affect the start and the spread of fire. In order that future records may be more useful, all crash accidents should be studied to determine why fire does or does not occur and to establish data that relate the occurrence and the spread of fire to airplane design and operation

Bibliography of unclassified aircraft-fire literature

The bibliography includes reports and articles which have been published within an approximate 20-year period ending January 1, 1949

Western Coating v. Gibbons & Reed : Unknown

Blog naar aanleiding van twee afstudeeronderzoeken bij FNV Regio Noord. Uitkeringsgerechtigden blijken niet verplicht te zijn om te solliciteren in Duitsland. Grensarbeiders die in Nederland wonen en in Duitsland werken krijgen onvoldoende voorlichting, onder andere over consequenties voor salaris, toeslagen en vergoedingen. Beide afstudeeronderzoeken zijn genomineerd voor FNV Scriptieprijs 2015. Ilona Pesman kreeg FNV scriptieprijs

An investigation on the effects of time integration schemes on weakly compressible SPH method

Temporal discretization is a key aspect of the weakly compressible Smoothed Particle H drodynamics (SPH) method, as existing studies prove that the time integration schemes affect the stability of the simulations of weakly compressible SPH [1]. In this study, accuracy and performance of the classical 4th order Runge-Kutta method as a time integration scheme was evaluated by comparing simulation results of 2D dam break problem in terms of pressure and free surface profiles with single step (Euler method), predictor-corrector (midpoint) schemes and existing simulation results given in the literature. Density correction algorithm was utilized as a baseline treatment to prevent density fluctuations. The effect of Artificial Particle Displacement (APD) algorithm is another numerical treatment which is investigated in the present work. It is observed that APD provides more homogeneous particle distribution, leading to a higher accuracy. As for the comparison between time integration schemes, results based on the free surface deformation indicate that the Runge-Kutta method achieves success at reducing the free surface particle scattering encountered on Euler and midpoint schemes

Control of dynamic trim for planing vessels with interceptors in terms of comfort and minimum drag

Nowadays, interceptors are often used to decrease total resistance and enhance comfort by reducing dynamic trim for high-speed planing vessels. They can be controlled manually as well as automatically by using a suitable closed-loop control system. Thus, in the present study, an automatically controllable system is presented to minimize the total resistance by reducing the dynamic trim in calm water. To reach this aim, a mathematical model which can represent the 2 degree of freedom vertical motion of a prismatic planing vessel is presented. The coefficients used in the model are calculated by using the Savitsky method. The standard dynamic trim angle and the optimum ones in terms of resistance are calculated by using the same method. For control action, a linear full state feedback control strategy (linear quadratic regulator) is applied, and instantaneous blade heights are found considering the change in forward speed. Therefore, the control-oriented model is able to change the blade height to reach the optimum trim angle in terms of the total resistance of the vessel for different forward speeds and speed profiles. The results show that the designed linear quadratic regulator control strategy is successful for reference trim tracking problems