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A linear analysis of conical whirl instability of an unloaded rigid rotor supported on hydrodynamic journal bearings with micropolar lubrication has been presented. In self-excited conical whirling motion, the rotor has 2 degrees of freedom with hydrdynamic film pressure distribution in the bearing clearance. The hydrodynamic film pressure distribution has been obtained by solving the modified Reynolds equation based on the theory of the micropolar lubrication satisfying the appropriate boundary conditions. With the help of the components of dynamic tilting stiffness and damping coefficients, stability characteristics are obtained. The effects of various parameters, namely the non-dimensional micropolar characteristic length, coupling number, clearance ratio and slenderness ratio on the conical stability parameter have been investigated.

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Fusion of registered images of night scenery that are obtained from cameras tuned to different band-widths will be a significant component of future night-vision devices. A new algorithm for such multispectral image fusion is described. The algorithm performs gray-scale image fusion using a method based on principal components. The monochrome fused image is then colored by means of a suitable pseudocoloring technique to produce the fused color output image. The approach can easily be used for any number of bandwidths. Examples illustrate the algorithm’s use to fuse an intensified low-light visible image with another image obtained from a single forward-looking infrared camera. The algorithm may be implemented readily in hardware for use in night-vision devices as an important aid to surveillance and navigation in total darkness. The applicability of the technology to transportation is also discussed.