Abstract:
The process of the invention is used to determine the propagation properties of mechanical waves in a beam or tube-like structure. To this end, bending waves are generated at a first point in the structure which are measured at spaced points along the structure. The measurements made are used to find the transmission function of the waves. The bending waves are generated by successive percussion pulses, the shape and especially the width and height of which are automatically adjusted in such a way that the difference between a theoretical dispersion relation and a value obtained from the measurements is minimal. The flexural rigidity of the structure (20), e.g. a living bone, can be determined by evaluating the transmission function.
Abstract:
Described is a sole for sports shoes in particular, the sole having a shock-absorbing layer and, joined to the side of this layer nearest the ground, an external wear layer which may incorporate a tread or carry a treaded layer. The shock-absorbing layer is made of hard, flexurally elastic plastic and has a number of supporting walls, disposed essentially parallel to the longitudinal exis of the shoe, which enclose cavities between them. Viewed in section, the supporting walls are disposed to fit together, inclined at an angle and/or curved, between the external wear layer and the top of the shock-absorbing layer.
Abstract:
The process of the invention is used to determine the propagation properties of mechanical waves in a beam or tube-like structure. To this end, bending waves are generated at a first point in the structure which are measured at spaced points along the structure. The measurements made are used to find the transmission function of the waves. The bending waves are generated by successive percussion pulses, the shape and especially the width and height of which are automatically adjusted in such a way that the difference between a theoretical dispersion relation and a value obtained from the measurements is minimal. The flexural rigidity of the structure (20), e.g. a living bone, can be determined by evaluating the transmission function.
Abstract:
Described is a sole for sports shoes (2) in particular, the sole having a multiplicity of individual flexurally elastic support elements (21) disposed at right angles to the longitudinal axis of the shoe at intervals one behind the other along the longitudinal axis. The support-element edges nearest the foot are joined to a cover plate (20) and the edges nearest the ground to an external wear layer (22). Each support element (21) consist of a compact box-girder structure with top chord running at right angles to the longitudinal axis of the shoe, a bottom chord parallel to the top chord, two lateral supporting walls joining the ends of these two chords, and stays bracing the top chord against the bottom chord.