This study is concentrated on the natural frequencies and mode shapes of a simple three-member space frame coupled with a dynamic vibration absorber. The dynamic vibration absorber is modeled as a six-degree-of-freedom mass-spring system. For the first time, the free vibration of an elastic structure with a six-degree-of-freedom mass-spring system is found. Each member of the space frame has un...

We combine a prior incomplete deadlock-freedom-checking approach with two new reachability techniques to create a more precise deadlock-freedom-checking framework for concurrent systems. The reachability techniques that we propose are based on the analysis of individual components of the system; we use static analysis to summarise the behaviour that might lead components to this system state, a...

Shape memory and pseudoelastic effects are thermomechanical phenomena associated with martensitic phase transformations, presented by shape memory alloys. The dynamical analysis of intelligent systems that use shape memory actuators involves a multi-degree of freedom system. This contribution concerns with the chaotic response of shape memory systems. Two different systems are considered: a sin...

Rotary electromagnetic generators that have high power density, large output, and rotational inertia are increasingly used in vibration energy-harvesting systems. When applied to single-degree-of-freedom (SDOF) systems, it is found the inertance reduces system frequency bandwidth. Furthermore, maximum output of SDOF systems limited by mechanical damping allowable stroke. Two-degrees-of-freedom ...

the present article studies the quran's view on free will and freedom. some related issues discussed here are: (1) human freedom is the basis of the creation; (2) respecting human freedom is the basis of the prophet's invitation of the people to islam; (3) political freedom is the foundation of forming political societies, and so on. with reference to the quranic verses and moslem sch...