ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Oct 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
November 2025
Nuclear Technology
Fusion Science and Technology
October 2025
Latest News
Nano to begin drilling next week in Illinois
It’s been a good month for Nano Nuclear in the state of Illinois. On October 7, the Office of Governor J.B. Pritzker announced that the company would be awarded $6.8 million from the Reimagining Energy and Vehicles in Illinois Act to help fund the development of its new regional research and development facility in the Chicago suburb of Oak Brook.
Amir N. Nahavandi and George J. Bohm
Nuclear Science and Engineering | Volume 26 | Number 1 | September 1966 | Pages 80-89
Technical Paper | doi.org/10.13182/NSE66-A17190
Articles are hosted by Taylor and Francis Online.
The dynamic response of reactor structural components is obtained by direct numerical solution of the differential equations for a linear or a nonlinear situation considering the components to be a continuous network. The equation of motion of each element is expressed in spatial finite-difference form and integrated to determine deflections as a function of time. The deflection curves and excitation frequencies in a vertical beam, sinusoidally excited at the top and striking an elastic spring at the bottom, are determined satisfactorily as an example of the method. The pattern in this nonlinear system is shown to be similar to the modal behavior of linear structures. The single-valuedness and the lack of discontinuous jumps in the response curve characterize the dynamic stability of the system. The time variation of the beam-end displacements demonstrate the existence of nonuniform distributions of sub- and super-harmonics in the response frequency spectrum. A numerical stability analysis is performed for the problem under study and a criterion for the convergence of the numerical solution is developed. This criterion proved to be satisfactory for the analysis.