Dynamic performance of parallel link suspension with seek motion during contact-sliding
Seek behavior and orientation of a contact-sliding head were investigated for two types of suspension with a ball slider. In a fundamental measurement, a seek behavior of the ball slider with a parallel link suspension was independent of kinetic friction in the sliding direction. A torsional displacement of the ball slider was inverse proportional to a ratio of torsional rigidity between a single beam and a parallel link suspension. In a dynamic measurement on a rotary disk, the ball slider with the single beam bounced intensely and showed large torsional displacement. While the parallel link suspension showed negligible torsion and kept stable orientation during seek motion.
A NEW SUPPORTING MECHANISM FOR NON-FLYING SINGLE-POLE HEAD
---We have studied two types of head supporting mechanisms for a non-flying single-pole-type head (SPT head). One is a self-weight type, in which the smooth up-and-down motion of a head is achieved using a micro linear bearing. The other is a balanced type that achieves the access to both sides of the disks and make the disk access stable under acceleration over 1 G. Both new supporting mechanisms show a good off-track and a track access characteristics. After the seeking of 7 mm distance on a disk, a reproduced voltage fluctuation with the new type mechanism is less than 2 % that corresponds to the off-track distance of 2 /!ID, whereas, that with the conventional type mechanism is 5 %- 10 % that corresponds to the off-track over 10 /!ID. A head installed in this head supporting mechanisms follows the disk up to 3600 r.p.m.. This result agrees well with the calculated results of the head motion using the equation of motion.
SUSTAINABLE URBAN DEVELOPMENT AND URBAN REGENERATION DUMITRESCU
Concerns about the conflict between economy, development on one hand and urban cultural heritage on the other hand, have made the urban development to be lately one of the most important themes at European level. Also, another issue of concern is social equity, aiming to strike a balance between economic development and equal access to culture for all generations of inhabitants of urban communities. Basically, ensuring these balances between urban cultural heritage, economy and social equity we express the essence of the concept of sustainable development from the perspective of culture. Urbanization is an ongoing process in all the cities of the world, but urban cultural heritage is a crucial element in the development of the cities and has an important impact over the quality of life of that community. Castles, churches, fortresses, squares and public buildings all contribute at the creating of the community history and of their characteristics.