Electrical power consumption of electrodynamic inertial mass actuators for active vibration control

Fraunhofer LBF / 17.8.2016


Active vibration control concepts have been demonstrated to be a promising approach for controlling vibrations in various civil-engineering, automotive, naval, aerospace and industrial applications. In many cases, the implementation of these concepts in commercial products is challenging due to practical, physical and economic constraints on the allowable computational load and the total power consumption. Recently, the Fraunhofer institute LBF has conducted studies on simulating and experimentally estimating the electrical and mechanical power flow in active control systems in order to develop energy efficient solutions. There are a number remaining open questions on how to model electromechanically coupled systems and how to measure the power flow experimentally in the laboratory. There is also a need for further investigations in time and frequency domain evaluation methods for the estimation of apparent, active and reactive electrical power components for broad band electrical signals.



The scope of this thesis is the numerical and experimental estimation of the electrical power consumption of electrodynamic inertial mass actuators (IMAs). They are typically used in active vibration control systems. The MATLAB-Simulink environment will be used to conduct simulations of an IMA coupled to different mechanical impedances. The electrical power flow between IMA and a power amplifier stage will be estimated in the time and frequency domain. The simulations will be compared to the results from experimental studies in the laboratory. Aim is to validate and improve the simulation models and to develop experimental measurement techniques for electrical power flow.


Specific aspects and tasks

  • Modelling of coupled electromechanical systems
  • Time and frequency domain analysis of broad band voltage and current signals to yield apparent, active and reactive electrical power components.
  • Development of circuit boards for the acquisition of broad band voltage and current signals for experimental studies in the laboratory.
  • Modelling of the effects of the circuit boards electrical characteristics on the measured signals



This topic is suitable for students in the field of mechanical engineering, computational engineering, electronics, mechatronics or related subjects. The student is expected to demonstrate a high level of commitment and willingness to learn. Previous experience in designing (printed) circuit boards is beneficial. Good command of written and spoken English is essential.