Roughly 20 years ago Valentino Braitenberg published a book on vehicles—a treatment of the amazingly complex behavior of a variety of very simple machines (Braitenberg 1984). This approach was inspired by the “law of uphill analysis and downhill invention.” Accordingly it is easier to design a mechanism to do something from scratch than to figure out just how nature has contrived to do it. Alth...

OBJECTIVE Chest wall vibrations are commonly used techniques that remain largely unquantified. In order to understand their effects, it is essential to measure the forces applied and their repeatability over time. This study investigated the repeatability of vibrations within and between test occasions. DESIGN Test-retest repeatability study. PARTICIPANTS Eight physiotherapists applied vibr...

in this work an improved method for designing a linear vibrational absorber, excited by random vibrations is presented and analyzed. first, analytical expressions, for non-stationary white noise accelerations, are derived. the criterion is different from the conventional criteria, used for structural design under random vibration, and it is based on minimum displacement or acceleration response...