Grundlegende Untersuchungen zu Partikel-Haftkräften und ihrer Beeinflussung

应用研究项目的目的是研究弹性和阻尼振动表面上的颗粒行为。为此目的，将使用前面描述的振动方法来确定在不同大气条件下弹性基底如塑料箔、海绵、羊毛过滤器和膜上的粘附力分布。使用这些可变形基底，弹性和阻尼引起二次振动，这导致脱离力随时间波动。因此，脱离力和脱离事件之间的明确相关性可能会丢失。为了解决这个问题，将使用压电驱动脉冲发生器。由于上升和上升时间的高再现性，可以很好地控制所产生的加速度。由于脉冲是一个奇异事件，因此分离力和分离事件之间的相关性是很清楚的，所研究的材料在振动或脉冲扰动下的动力学响应取决于材料的弹性和阻尼特性。在薄膜、羊毛过滤器等的情况下，必须考虑由于基底结构而产生的附加系统阻尼，这些值不能以简单的方式找到。因此，将研究如何成功地确定阻尼，使用显微镜激光测振仪，这是振动法实验装置的一部分。

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.