In the scope of this paper, a novel efficiency optimized supply pressure adaptive concept of pneumatic pressure boosters is presented. It is deduced from a profound analysis of state of the art components. The working cycle of the pump chambers can be divided into a filling, compression, pumping and decompression phase. A promising solution for efficiency improvements, which is further analyzed in the scope of this paper, is to adapt the required force of the compression chambers by nonlinear mechanics. Thus, a smaller force at the end of the stroke is required and a reduced air consumption of the driving chamber occurs. As the force demand of the compression chamber and therewith the load distribution over the stroke changes with the operational pressures, an adaptive concept needs to be implemented.
The novel device and its parameterization are deduced by means of an analytical description of state of the art pressure boosters. Subsequently, it is investigated by one-dimensional simulation in DSHplus. The results show broad applicability of the method in relevant applications and huge energy saving potentials compared to state of the art products.
The practical implementation and parameterization of a model for estimating the magnetic force of valve solenoids involving a hysteresis model are evaluated. In a first step, popular approaches for modeling the force hysteresis of valve actuators are compared, followed by a description of the test bench used and the valve investigated. Next, the experimental procedure as well as the recorded data are described and discussed. Finally, a phenomenological modeling approach of force hysteresis is presented. The advantages and limitations are demonstrated and discussed using measured data.
Compressed air production is responsible for approximately 10% of the industrial electricity consumption within the European Union. Meanwhile, inefficient downstream throttling is mostly used for speed control of pneumatic drives. Thus, in the past, more efficient control strategies have been in focus of multiple research projects. Nevertheless, negative impacts of the resulting systems on simplicity in implementation and commissioning as well as on procurement costs are hindering a broader application. Therefore, the focus of this paper lies on a novel compressed air saving switching scheme, looking not for the utmost efficiency, but for simple and cheap implementation.
The solution bases on simple to implement state of the art circuits, the up- and downstream throttling. The novel system aims to combine the benefits of the two before mentioned circuits in a compact, simple to implement component. The paper presents the three before-mentioned systems and compares these by means of analytical equations and lumped parameter simulations. The study reveals a broad applicability of the novel switching scheme and significant efficiency improvements.
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