Grundlegende Untersuchungen zu Partikel-Haftkräften und ihrer Beeinflussung

应用研究项目的目的是研究颗粒在弹性和阻尼振动表面上的行为。为此，前面描述的振动法将被用来确定在不同大气条件下作为塑料薄膜、海绵、羊毛过滤器和薄膜的弹性衬底上的附着力分布。使用这些可变形的衬底，弹性和阻尼会引起二次振动，导致脱落力随时间波动。因此，脱落力和脱离事件之间的明显相关性可能会丢失。为了解决这一问题，将使用压电驱动脉冲发生器。由于上升和上升时间具有很高的重复性，因此可以很好地控制由此产生的加速度。脉冲是一种奇异事件，因此剥离力和剥离事件之间的相关性仍然很清楚。所研究的材料在振动或脉冲激振下的动态响应取决于材料的弹性和阻尼性。在膜、绒毛过滤器等的情况下，必须考虑由于衬底结构而产生的附加系统衰减，这些值不能以简单的方式找到。因此，作为振动法实验装置的一部分，将使用显微镜激光测振仪来研究如何成功地确定阻尼值。

Aim of the applied research project is the investigation of particle behavior on elastic and damping vibrating surfaces. For this purpose the earlier described Vibration Method will be used to determine adhesion force distributions on elastic substrates as plastic foils, sponges, fleece filters and membranes at varying atmospheric conditions. Using these deformable substrates, the elasticity and damping cause secondary vibrations which result in detachment forces fluctuating over the time.Because of this the clear correlation between detachment force and detachment event can get lost. To solve this problem, a piezo driven pulse generator will be used. Because of the high reproducibility concerning rise and rise time, the resulting acceleration can be controlled very well. A pulse is a singular event so the correlation between detachment force and detachment event remains clear.The dynamic answer of the investigated materials caused on a vibration or pulse agitation depends from the elastic and damping properties of the material. In the case of membranes fleece filter etc. an additional system damping because of the substrate structure has to be considered which values cannot be found in an easy way. So it will be investigated, how successful the damping can be determined, using the microscope laser vibrometer which is part of the experimental set-up for the Vibration Method.