The free vibration characteristics of fluid-filled functionally graded cylindrical shells buried partially in elas- tic foundations are investigated by an analytical method. The elastic foundation of partial axial and...The free vibration characteristics of fluid-filled functionally graded cylindrical shells buried partially in elas- tic foundations are investigated by an analytical method. The elastic foundation of partial axial and angular dimen- sions is represented by the Pasternak model. The motion of the shells is represented by the first-order shear defor- mation theory to account for rotary inertia and transverse shear strains. The functionally graded cylindrical shells are composed of stainless steel and silicon nitride. Material prop- erties vary continuously through the thickness according to a power law distribution in terms of the volume fraction of the constituents. The governing equation is obtained using the Rayleigh-Ritz method and a variation approach. The fluid is described by the classical potential flow theory. Numerical examples are presented and compared with existing available results to validate the present method.展开更多
1. The focus is on private foundations, which are engaged in advancing science, technology, and the humanities. In this context the Volkswagen Foundationis a prominent example for Germany. 2. Accordingly, the paper do...1. The focus is on private foundations, which are engaged in advancing science, technology, and the humanities. In this context the Volkswagen Foundationis a prominent example for Germany. 2. Accordingly, the paper does not look at the management within firms , but at the systemic level of innovation management. Though innovation has a broadermeaning, including also economic, social, and political aspects. research and higher education are central arenas and factors of change. 3. Contemporary research and higher education are confronted with new challenges, which require new responses and new forms of innovation management: science and technology has become an integral part of the knowledge- based society; the boundaries between basic and applied research are vanishing, problem --oriented research is increasing, as a consequence the demand for inter展开更多
文摘The free vibration characteristics of fluid-filled functionally graded cylindrical shells buried partially in elas- tic foundations are investigated by an analytical method. The elastic foundation of partial axial and angular dimen- sions is represented by the Pasternak model. The motion of the shells is represented by the first-order shear defor- mation theory to account for rotary inertia and transverse shear strains. The functionally graded cylindrical shells are composed of stainless steel and silicon nitride. Material prop- erties vary continuously through the thickness according to a power law distribution in terms of the volume fraction of the constituents. The governing equation is obtained using the Rayleigh-Ritz method and a variation approach. The fluid is described by the classical potential flow theory. Numerical examples are presented and compared with existing available results to validate the present method.
文摘1. The focus is on private foundations, which are engaged in advancing science, technology, and the humanities. In this context the Volkswagen Foundationis a prominent example for Germany. 2. Accordingly, the paper does not look at the management within firms , but at the systemic level of innovation management. Though innovation has a broadermeaning, including also economic, social, and political aspects. research and higher education are central arenas and factors of change. 3. Contemporary research and higher education are confronted with new challenges, which require new responses and new forms of innovation management: science and technology has become an integral part of the knowledge- based society; the boundaries between basic and applied research are vanishing, problem --oriented research is increasing, as a consequence the demand for inter
