Modellgestützte Entwicklung eines Verfahrens zur Volumenstromermittlung an Vibrationsfördersystemen

• Model-based development of a method for volume flow determination of vibratory conveying systems

Trofimov, Igor; Corves, Burkhard (Thesis advisor); Bruckmann, Tobias (Thesis advisor)

Aachen : RWTH Aachen University (2022)
Dissertation / PhD Thesis

Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022

Abstract

The applied research topic discussed in this thesis consists of two major parts. First, there is an experimental study of the behaviour of a real vibratory mechanical system. The aim here is to create a plausible numerical process-model by determining the relevant system input and output variables. Secondly, there are the investigations and the optimisation measures on this model in order to reach the desired system properties or functionalities using an optimisation method with subsequent experimental verification of the optimisation results. The desired system functionalities can be formulated as follows: The measuring device of the controller of a linear vibratory conveyor for bulk material is supposed to determine the mass flow, i.e. both the mass and the speed of the material moving on the conveying element, in a continuous material flow, by only using the weighing sensor (force sensor). This is referred to as sensorless detection of the speed of the bulk material being conveyed. The idea of sensorless detection of the speed of a constant material flow on the linear vibratory conveyor is based on the evaluation of the time signal of the weighing sensor integrated in the system controller. The time signal, in the otherwise constant signal, occurs at the weighing sensor due to a mass discontinuity (mass error) that is deliberately caused in the homogeneous material flow on the trough of the conveyor. It is realised by varying the vibration behaviour of the conveyor by using the following phenomena that occur in vibration-loaded bulk material: The profile of the material flow as well as the density (aggregate state) of the material can change as a result of a change in the vibration energy supplied. The system response to variation of the vibration energy in the form of the time signal of the weighing sensor is evaluated with a special evaluation algorithm for the conveying speed. The evaluation results are integrated into the mathematical model in addition to the values of the input parameters of the process. In the next step, the model was considered as a multi-dimensional optimisation problem and handled by using a suitable optimisation method. Subsequently, the determined optimum was validated metrologically.

Institutions

• Chair and Institute of Mechanism Theory, Machine Dynamics and Robotics [411910]