Roman Regulski

Design and Investigations into the Piezobender Controlled Servovalve

Electrohydraulic servo drives can be found in many industrial applications. A typical design of a servovalve uses the known torque motor. The main concept of designing the modification of the servovalve described in the paper was concern about the application of a piezobender as an actuator, working between nozzles as a flapper, at a control stage. The paper presents and investigates the design of a power amplifier for piezobenders and a digital controller for an electrohydraulic servo valve with a piezobender element. The article shows and discusses the main concept of design and the results of experimental investigation.

Share Mode Magnetorheological Dampers for Vibration Attenuation in Domestic Washing Machines

The article presents a new approach for noise reduction of a household washing machine. The noise sources and phenomenon were described. After investigation of a currently used solution, and alternative available solutions, a new approach was presented. Design and tests of a low costs magnetorheological fluid, semi-active damper were presented. The input parameters for the new damper were identified on the base of investigation of a viscous damper, used in washing machines. The described MR damper was applied in a washing machine suspension system. Next, a study of washing machine acceleration RMS for different unbalanced masses and durum rotations, were performed. During this research the new damper was switched on and off, to shows it influence on the acceleration. The end results show that the new designed dampers can strongly reduce the vibrations of the washing machine housing and its plastic components.

Research of Basic Parameters of Piezoelectric Tube Actuator

The article present basic research of the piezoelectric tube actuator. In this study the actuator was tested for various DC voltages. Further hysteresis and creep effect of the piezo ceramic material were presented. The next point of this research was positioning control of tube under closed loop control. For this purpose classic PID control algorithm was applied, with a negative feedback from laser displacement sensor. The control software was developed under Matlab Simulink and dSPACE control system, which allows fast modification and testing.

Study on Mechanical Characteristics in Electromechanical Disengaging Damper

The paper is focused on study of new type of vibration control damper which has been designed, machined, assembled, and calibrated by authors. In typical oil dampers, attenuation force is generated by fixed orifices, where oil passes from one chamber to another. More advanced designs include variable orifices, where it is possible to regulate precisely flow area, e.g., by proportional valve. Thus, these solutions are so-called valve mode, also very popular in whole group of magnetorheological dampers. Another known in engineering type of dampers is based on viscous friction. Steel rood passed through cylinder head, where interference fit creates movement resistance. This paper proposes novel design of damper, where in order to control damping force, simple direct current motor and special mechanism, similar to wedge, has been proposed. To perform basic research on damper’s characteristics, special test stand was designed. Crankshaft mechanism was used to generate reciprocating movement. During tests, one end fixed damper was connected to slider by force transducer. To describe phenomenon of variable damping force, force–displacement and force–velocity characteristics have been registered and described.

Washing Machine Controller with a New Programming Method

Abstract In the paper the newly designed at Poznan University of Technology (PUT) washing machine controller is presented. The commonly used in washing machines sensors, drives and other input-output elements are briefly described. The designed at PUT controller is based on 32-bit STM32 microcontroller. The used in this controller modules are described and their input/output signals and basics of operations are presented. The developed in the controller user-machine communication devices, elements and methods are described. The paper presents new washing machine programming methods and implementation software, such as voice recognition and intelligent programming of washing machine that were applied in the new controller.

Multichannel High Voltage Amplifier for Piezo Actuators

This paper describes investigations of a low cost high voltage amplifier, which was based on specialized operational amplifiers. The purpose of the amplifier is to control piezoelectric actuators with many electrodes, such as bimorph benders, piezoelectric tubes, ring and disc benders. Proposed amplifier has two independent channels which can be configured for the specific research aim. Every channel of the device can works in inverted or non inverted mode. Also the voltage gain and current limit can be set separately.