Chapter 8 establishes the relationship between the input and output power spectral densities of a linear system. Limitations on results are carefully detailed and the case of oscillator noise is considered. The theory is extended to multiple input-multiple output systems.

Linear System Theory

Analytical Methods in Vibrations

Interferometric hologram evaluation and real-time vibration analysis of diffuse objects

Dynamic analysis of a rotating cantilever beam by using the finite element method

Hygrothermal effects on the structural behaviour of thick composite laminates using higher-order theory

Hunting stability analysis of high-speed railway vehicle trucks on tangent tracks

Modeling and nonlinear hunting stability analysis of high-speed railway vehicle moving on curved tracks

Hygrothermal effects on the stability of a cylindrical composite shell panel

The finite element method is applied to study the problem of moisture and temperature effects on the stability of a general orthotropic cylindrical composite shell panel subjected to axial or in-plane shear loading. The element employed is a nine-node isoparametric shell element. As the hygrothermal effects on the elastic properties of the matrices and the fibers are very different, the degradation of elastic moduli, the transverse shear effect and the induced initial stress are all considered. Numerical investigation shows that if the temperature increases from 300 to 422 K and the moisture concentration is saturated, the buckling load with both the degradation of elastic moduli and transverse shear deformation considered is ca . 12% lower than Snead and Papazotto's result where only the degradation of elastic moduli was considered. In addition, it is shown that the influence of the initial stress, induced by the same environmental variations, on the buckling load is far less significant.

This invention applies a new computer and printer integrated technology to aid forming physical objects rapidly, and the method and apparatus are disclosed to satisfy the market requirements for a quick, reliable, safe, and inexpensive operation. The invention coverts a virtual object stored in the storage device of computer through software that slices the virtual object into many layers. The cross-section of the first layer is sent to a printer or a plotter, and the contour domain is printed or plotted by the printer or plotter. The fluid (not limited to binder) in the printer head is coated onto a layer of uniform distributed porous material which allows the powder and fluid to combine with each other; however, the combining process can be either a natural or an artificial process to enhance the binding force between the fluid and powder. After the first layer is finished, the second layer of powder is uniformly distributed on the first layer, and the contour printing process is repeated. As the printing process is repeated until all slicing layers of the model are finished, the object is stacked layer by layer sequentially. The physical object can be obtained after all the unglued powders are removed. The above-mentioned printing process not only produces monochrome objects, but also produces color objects. The machine includes components of a printer or plotter and its interface card, and x-z axis traversal driven mechanism. The operation platforms include a material supply chamber, a constructing chamber at which powder material is combined with solution, and a recycling hole. A slicing algorithm control software is used to calculate the cross-sectional contour, and the manufacture process is controlled by software and hardware interfaces.

Sen Yung Lee

Papers

Hunting stability analysis of high-speed railway vehicle trucks on tangent tracks

Modeling and nonlinear hunting stability analysis of high-speed railway vehicle moving on curved tracks

Hygrothermal effects on the stability of a cylindrical composite shell panel

Hygrothermal effects on the stability of a cylindrical composite shell panel

Method and apparatus for rapid prototyping using computer-printer aided to object realization