Abstract
In this work an original construction of a vibration damper controlled by means of a valve with a short time of operation lag is presented. The valve-controlling properties of the damper regulates the flow of fluid between the chambers of the damper and was constructed using piezoelectric actuators, whose characteristic feature is the possibility to change dimensions, e.g., length, under the influence of voltage. As a result, by changing voltage it is possible to control the throttle of the flow by changing the width of a gap, which influences a change of damping forces. Such a solution enables a quicker change of damping forces than in other kinds of controlled damper. Due to the obtained properties, the damper may be applied to reduce the vibrations of vehicles and machines that undergo quick-change loads. In the article, the results of experimental studies of the aforementioned damper are presented. Based on the results, dissipative characteristics were determined. Also, results of numerical studies comprising the development of a numerical model of a controlled piezoelectric damper are shown. Results of numerical studies, as well as experimental studies, are presented in the form of dissipative characteristics. Comparison of results of numerical and experimental studies confirms the possibility to apply this kind of construction in semi-active systems of vibration reduction of vehicles and machines.
Highlights
The topic of damping of vibrations in mechanical systems is current due to safety, the comfort of people and the protection of machines and their components
On the graphs (Figure 5) of force–displacement and force–velocity, one may notice the increase in values of damping forces together with the increase of voltage in the electronic system
Results of studies of the piezoelectric valve (PZ) damper with a change of temperatures are shown in Results of the PZconducted damper with change ofexcitation temperatures are shown in Figures 8 andof9.studies
Summary
The topic of damping of vibrations in mechanical systems is current due to safety, the comfort of people and the protection of machines and their components. The results obtained from experimental and numerical studies confirmed the possibility to use controlled dampers with a piezoelectric valve to damp vibrations of vehicles and machines. This type of damper may be applied in systems, where quick changes of range. 3 ofof possibility to use controlled dampers with a piezoelectric valve to damp vibrations vehicles and machines This type of damper may be applied in systems, where quick changes of range of vibration frequencies occur. A piezoelectric which is on the level of approximately 9 ms (change of control signal in a full range from damper be applied to damp vibrations of a vehicle, which damper influences thebesafety andto zero to may maximum damping force). To such aThe problem wastomore was more extensively discussed in the worksdiscussed [32,33]. in the works [32,33]
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