crawl space
4.We even－tually discovered that the snakes had gotten into the cellar through a small hole in the foundation. Apparently they had come in the previous fall. Perhaps they had been attracted to the basement because it was warmer than the adjoining crawl space. Perhaps the warm weather had caused them to come out of hibernation earlier than usual.
7.Abstract: Suppose we view a locomotive as a whole system,the space configuration of each locomotive is described by a 17-freedomed in horizon surface.Taking into account the elastic supporting of first and second system,hanging equipment and resistance characteristic,a space vibration model of four-axis bogie vehicle crawl vibration is presented.The characteristic root of the model is calculated.The stability of vehicle crawl vibration and critical velocity is researched.The result is that increasing vertical and horizontal stiffness and resistance of every wheel can decrease crawl vibration of bogies and carriages.And the optimization parameters are given.The improvements lie in using electromagnetic or crawl vibration absorber to replace hydraulic pressure vibration one and using awl spring to replace old pillar one.
