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International Journal of Hydromechatronics (5 papers in press)
Development and synchronisation of a physics-based model for heating, ventilation and air conditioning system integrated into a hybrid model by Antonio Gálvez, Dammika Seneviratne, Diego Galar Abstract: This paper proposes a physics-based model which is part of a hybrid model (HyM). The physics-based model is developed for a heating, ventilation, and air conditioning (HVAC) system installed in a passenger train carriage. This model will be used to generate data for building a data-driven mode. Thus, the combination of these two models provides the hybrid model-based approach (HyMAs). The physics-based model of the HVAC system is divided into four principal parts: cooling subsystems, heating subsystems, ventilation subsystems, and vehicle thermal networking. First, the subsystems are modelled, considering the sensors embedded in the real system. Next, the model is synchronised with the real system to give better simulation results and
validate the model. The cooling subsystem, heating subsystem and ventilation subsystem are validated with the acceptable sum square error (SSE) results. Second, the new virtual sensors are defined in the model, and their value to future research is suggested Keywords: : physics-based modelling; hybrid modelling; digital twins; HVAC system; transportation engineering; signal validation; predictive maintenance; simulation; virtual sensor; fault detection. DOI: 10.1504/IJHM.2021.10034926
Force control for ultraprecision hybrid electric-pneumatic vertical-positioning device by Tomonori Kato, Youwei Xu, Tomohiro Tanaka, Kohei Shimazaki Abstract: This study aims at the development of a control method for reducing motor loads in ultraprecision hybrid electric-pneumatic vertical-positioning devices (HVPDs), such as aspherical lens generators, that work by generating a vertical force via pressure adjustments within the balancing cylinder (BC). We also report on a proposed method for estimating the required vertical direction machining force during material processing that uses a disturbance observer. Furthermore, since our observations of the relationships among BC pressure, linear motor driving current, and vertical force have resulted in the development of a novel control method, we herein present experimental results comparing our proposed and conventional pressure control methods. These results confirm that our proposed method reduces motor loads during material
processing and that the use of a disturbance observer allows the external force
acting on the stage to be estimated continuously while maintaining high positioning performance. Keywords: ultraprecision positioning; balancing cylinder; hybrid system; pressure regulator; force control; disturbance observer. DOI: 10.1504/IJHM.2021.10035915
Modelling of fracture in pressure vessels by thin shell isogeometric analysis by Rijul Singla, Cosmin Anitescu, Sunil K. Singh, Indra V. Singh, Bhanu K. Mishra, Timon Rabczuk, Xiaoying Zhuang Abstract: We aim to model fracture on pressure vessel surfaces so that its rupture can be avoided. It is well known that pressure vessels have wide-spread applications in almost all industries. They are often subjected to high pressures and extreme temperatures and in some typical applications they even carry highly inflammable or hazardous substances. In the presence of cracks, the state of stress near the fracture zone becomes very high, due to the phenomenon of stress singularity at the crack tips. This greatly reduces the strength of the material and can lead to early failure. In this paper, the geometry of pressure vessels is discretised using splines which are used as the basis for isogeometric analysis (IGA). Initially, the stress analysis of thin pressure vessel is carried out in the absence of cracks by implementing IGA-based Kirchhoff-Love shell theory, and the results are compared with analytical or standard available solutions. The crack is assumed to cross the
entire thickness and is introduced either in axial or circumferential direction. Keywords: isogeometric analysis; IGA; extended isogeometric analysis; XIGA; Kirchhoff-Love shells; pressure vessels.
A numerical study of crack propagation with variable temperature in steel structures using peridynamic constitutive model by Jinhai Zhao, Haiyan Gao, Xiaokang Guo Abstract: Compared with other structures, steel structures have many advantages, but the problem of fire resistance is its fatal flaw, especially the steel structure work with cracks at high temperatures. Therefore, we introduced the variable temperature load into the peridynamic constitutive equation to simulate the cracks propagation paths in steel structures with variable temperature, and verify the correctness of new PD variable temperature constitutive model with ANSYS thermo-solid coupling method and three kinds of specimen with cracks of Q345 steel. We found the influence of temperature on the crack propagation path crack propagation rate increased, it is very important significance for scientific research and engineering application. Keywords: expansion coefficient; elastic modulus; thermo-solid coupling; bilateral cracks. DOI: 10.1504/IJHM.2021.10036571
A frequency domain-based study for fluid-borne noise reduction in hydraulic system with simple passive elements by Leandro Danes, Andrea Vacca Abstract: This article performs a holistic study on passive elements for hydraulic lines to reduce fluid borne noise. The solutions are investigated by developing a line model based on the method of characteristics and simulating elements that are purely reactive and do not introduce energy in the system. Simple and cost-effective solutions such as closed branches and Quincke tubes (parallel lines) are selected, and properly sized through simulation results. A test setup is also created to implement and test these solutions experimentally.
Four indicators (target pressure ripples) are chosen as a metric for summarising passive line elements behaviour in the frequency domain, targeting the 505,000 Hz frequency spectrum. The dependency of resonances based on the length of the line is identified and isolated in simulation. A pseudo-insertion loss power spectral is suggested as a metric of evaluation to compare attenuation when introducing the passive element preserving the circuits original length. The experimental results show how the three passive elements
are an effective solution for reducing noise, yielding to total sound pressure reduction up to 3 dB in some operation conditions with mitigation up to 15 dB in specific frequencies. Keywords: : fluid power; passive noise control; fluid borne noise reduction; Quincke tube; closed-branch silencer. DOI: 10.1504/IJHM.2021.10037156