Showing papers on "Dissipation published in 2022"
117 citations
TL;DR: Li et al. as discussed by the authors constructed a resistance-based thermal model of the batteries considering the impact of the state of charge (SOC), battery temperature, and current on the battery heat generation.
Abstract: Flying car is an effective transport to solve current traffic congestion. The power batteries in flying cars discharge at a high current rate in the takeoff and landing phase, evoking a severe thermal issue. Flat heat pipe (FHP) is a relatively new type of battery thermal management technology, which can effectively maintain the temperature uniformity of the battery pack. We have constructed a resistance‐based thermal model of the batteries considering the impact of the state of charge (SOC), battery temperature, and current on the battery heat generation. The FHP model is developed based on segmental heat conduction model, and integrated into the battery model to form the battery‐FHP‐coupled model for a battery module. Experiments are carried out to verify its accuracy. Then, the battery thermal performance is analyzed under the different discharging conditions including constant discharge rates and dynamic discharge rates for flying cars. Under the condition of the flying cars, the battery maximum temperature appears at the end of takeoff stage, while the maximum temperature difference appears during the forward flight segment. Moreover, different FHP heat dissipation structures are studied to further improve the battery thermal performance. The configuration with the best performance is adopted for the battery pack, and it can meet the heat dissipation requirements of the pack at a discharge rate of 3C or that of flying cars. Finally, the influence of inlet cooling air velocity and temperature on battery thermal performance is investigated. According to the research results, air velocity has little effect on the battery maximum temperature at the discharge rate of flying cars, but it can obviously affect the temperature decrease rate. Besides, the battery maximum temperature and its temperature difference develop linearly with the air temperature.
69 citations
TL;DR: In this article , the impact dynamics experiments were conducted to study energy characteristics based on split Hopkinson pressure bar (SHPB) system, and the incident, reflected and transmission strain were collected to calculate various energy.
54 citations
TL;DR: In this paper , the entropy production in pump flow has been reviewed, including energy loss analysis, design optimization, cavitation analysis, and fault diagnosis, and different perspectives were presented for future works and introduction to other methods such as kinetic energy dissipation theory to obtain procedures that reveal energy loss to improve the pump performance and try to understand the causes of pump failure.
51 citations
39 citations
TL;DR: In this paper , the behavior of reinforced concrete beams with circular openings and the failure types resulting from strengthening these beams with CFRP are parametrically investigated and the ultimate load capacity, ductility, stiffness, energy dissipation capacity and failure modes of the beams were determined.
37 citations
TL;DR: In this article , the authors show that non-trivial topological invariants can emerge purely in a system's dissipation, and demonstrate one-and two-dimensional lattices that host robust topological edge states with isolated dissipation rates.
Abstract: Topological phases feature robust edge states that are protected against the effects of defects and disorder. These phases have largely been studied in conservatively coupled systems, in which non-trivial topological invariants arise in the energy or frequency bands of a system. Here we show that, in dissipatively coupled systems, non-trivial topological invariants can emerge purely in a system’s dissipation. Using a highly scalable and easily reconfigurable time-multiplexed photonic resonator network, we experimentally demonstrate one- and two-dimensional lattices that host robust topological edge states with isolated dissipation rates, measure a dissipation spectrum that possesses a non-trivial topological invariant, and demonst rate topological protection of the network’s quality factor. The topologically non-trivial dissipation of our system exposes new opportunities to engineer dissipation in both classical and quantum systems. Moreover, our experimental platform’s straightforward scaling to higher dimensions and its ability to implement inhomogeneous, non-reciprocal and long range couplings may enable future work in the study of synthetic dimensions.
34 citations
01 Mar 2022
TL;DR: A comprehensive review of existing literature on shear thickening fluids is presented in this paper , where the basic properties, classification, and rheological mechanism evolution of STFs are discussed.
Abstract: Shear thickening fluids (STFs) are a new type of nanosuspension, which are formed by dispersing micro and nanoparticles in a dispersant. STFs are easily deformed under the action of a low shear rate. However, they instantly transform into a hard solid-like state at a high shear rate. After the removal of the impact force, STFs revert to their original liquid state. During this process, STFs absorb a significant amount of impact energy. Hence, they can be employed as a buffer and for vibration reduction. In this study, a comprehensive review of existing literature on STFs is presented. First, the basic properties, classification, and rheological mechanism evolution of STFs are discussed. The factors influencing the shear thickening behavior of these fluids are then reviewed. Subsequently, several computational models of the STF are discussed because the underlying mechanism of STF is still unclear, and to date, there is a paucity of good computational models. Finally, the research progress of composites based on STF in the fields of stab and spike resistance and low- and high-velocity impacts, and the use of STF as a new energy dissipation medium in the fields of explosion resistance, vibration control, adaptive structure, and industrial polishing are summarized.
33 citations
TL;DR: In this paper , an energy dissipation cover-plate (EDC) was proposed to improve the anti-progressive collapse capacity of fully welded connections with the aim of improving the robustness of the connection.
33 citations
TL;DR: In this article, an energy dissipation cover-plate (EDC) was proposed to improve the anti-progressive collapse capacity of fully welded connections with the aim of improving the robustness of the connection.
33 citations
TL;DR: In this paper , the authors focused on the vibration transmission and energy flow characteristics of low-dimensional models of dynamical systems with Coulomb friction and found that the existence of frictional contact at the interface can lead to a significant growth in the force transmissibility and energy transfer from the force-excited subsystem to the secondary system, especially at high excitation frequencies.
TL;DR: In this paper , the authors presented an assembled pre-pressed spring self-centering energy dissipation (A-PS-SCED) bracing system that uses disc spring groups to provide a recentering ability and a friction device to dissipate energy.
TL;DR: In this paper, a partial precast shear wall with double-legs at the base and reserved cast-in-place base zone and wall edges is proposed, which can have comparable and stable seismic performance with the conventional castinplace method and hence can be taken as an alternative in practice.
TL;DR: In this article , the authors explored the seismic behavior of self-centring hybrid-steel-frame (SC-HSF) employing energy dissipation sequences and the corresponding inelastic seismic demand model.
Abstract: This paper explored the seismic behaviour of self-centring hybrid-steel-frame (SC-HSF) employing energy dissipation sequences and the corresponding inelastic seismic demand model. The SC-HSF employing energy dissipation sequences was composed of the self-centring main frame (SCMF) and energy dissipation bays (EDBs). Two prototype structures were designed and developed using modelling techniques validated by experimental data. Nonlinear cyclic pushover analyses and nonlinear dynamic analyses were conducted to examine the seismic behaviour of the prototype structures. The seismic response of prototype structures including peak interstorey drifts and post-earthquake residual interstorey drifts were examined in detail. After verifying the promise of the SC-HSF structures, the energy factor for quantifying the inelastic seismic demand was developed by nonlinear spectral analyses based on the equivalent single-degree-of-freedom (SDOF) systems assigned with the structural hysteretic model. The effects of the structural hysteretic parameters on the mean and probabilistic features of the energy factors were discussed in detail. In addition, the lognormal distribution was selected to develop a probabilistic spectral seismic demand model based on a comparative study, and the prediction equations were developed to simulate the probabilistic features of the energy factors. Finally, the probabilistic spectral seismic demand model was used for evaluating the behaviour of the prototype structures, and the sufficiency of the model was justified.
TL;DR: In this article , a partial precast shear wall with double-legs at the base and reserved cast-in-place base zone and wall edges is proposed, which can have comparable and stable seismic performance with the conventional castinplace method and hence can be taken as an alternative in practice.
TL;DR: In this paper , a vertical strut and hexagon combined structure (VSHCS) is developed by overlapping the two convex corners of a hexagonal unit with two concave corners of the vertical strut combined structure, and the quasi-static compression and dynamic crushing behaviors of VSHCS are investigated through simulation and theoretical analysis.
TL;DR: In this article , a series of parametric studies were conducted to investigate the influence of some key factors on consolidation of partially saturated ground improved by impervious column inclusion, and it can be found that a higher value of the area replacement ratio or modulus of the pile results in a longer dissipation time of excess pore air pressure (PAP), a shorter dissipation of excess Pore water pressure(PWP), and a lower normalized settlement.
Abstract: This study focuses on the consolidation behavior and mathematical interpretation of partially-saturated ground improved by impervious column inclusion. The constitutive relations for soil skeleton, pore air and pore water for partially saturated soils are proposed in the context of partially-saturated ground improved by impervious column inclusion. Settlement equation and dissipation equations of excess pore air/water pressures for a partially saturated improved ground are then derived. The semi-analytical solutions for ground settlement and pore pressure dissipation are then obtained through the Laplace transform and validated by the existing solutions for two special cases in the literature and the numerical results obtained from the finite difference method. A series of parametric studies is finally conducted to investigate the influence of some key factors on consolidation of partially saturated ground improved by impervious column inclusion. Based on the parametric study, it can be found that a higher value of the area replacement ratio or modulus of the pile results in a longer dissipation time of excess pore air pressure (PAP), a shorter dissipation time of excess pore water pressure (PWP), and a lower normalized settlement.
TL;DR: In this paper , the authors focused on steel moment resisting frames equipped with SMA connections in the self-centring energy dissipation bays, and the emphasis was given to a direct-iterative design method for performance-based-plastic-design of the system under earthquake motions.
TL;DR: In this article, a series of experiments are conducted to systematically investigate the cooling efficiency of PCM and several detailed factors on the thermal management performance, such as the structure, phase change temperature and thickness of the PCM.
TL;DR: In this paper , an alloy conforming to the composition Ni50Ti48V2 (at. %) was cast in a vacuum induction melting furnace, and hot deformation tests were performed on the samples using a GLEEBLE 3800 thermomechanical simulator over a range of strain rates (0.01 s−1, 0.1 s − 1, 1 s− 1, 10 s−
TL;DR: In this article , a non-reciprocal dissipation-less transport in single ballistic InSb nanoflag Josephson junctions was investigated and it was shown that the diode effect is intrinsic to this material.
Abstract: We report nonreciprocal dissipation-less transport in single ballistic InSb nanoflag Josephson junctions. Applying an in-plane magnetic field, we observe an inequality in supercurrent for the two opposite current propagation directions. Thus, these devices can work as Josephson diodes, with dissipation-less current flowing in only one direction. For small fields, the supercurrent asymmetry increases linearly with external field, and then it saturates as the Zeeman energy becomes relevant, before it finally decreases to zero at higher fields. The effect is maximum when the in-plane field is perpendicular to the current vector, which identifies Rashba spin–orbit coupling as the main symmetry-breaking mechanism. While a variation in carrier concentration in these high-quality InSb nanoflags does not significantly influence the supercurrent asymmetry, it is instead strongly suppressed by an increase in temperature. Our experimental findings are consistent with a model for ballistic short junctions and show that the diode effect is intrinsic to this material.
TL;DR: In this paper , the effect of RTSF content on static and dynamic properties of concrete has been investigated and the optimal dosage for concrete was found to be 0.75, considering workability, compressive strength, dynamic increase factor (DIF), energy dissipation and toughening mechanism.
TL;DR: In this paper , the microwave performance of CoFe 2 O 4 was significantly improved with the reflection loss (RL) of M2 of −40 dB and achieved an ultra-wide effective absorption bandwidth (EAB) of 13 and 12.5 GHz, respectively.
TL;DR: In this paper , an innovative replaceable fuse connection for beam members in moment resisting steel frames was proposed, where steel angles are designed as fuse elements for energy dissipation and post-earthquake replacement.
TL;DR: In this paper , the authors investigated the fracture evolution and instability warning predication for the fissure-contained hollow-cylinder granite exposed to multi-stage cyclic loads, and the influence of the hollow hole diameter on rock fracture was experimentally investigated in terms of deformation, hysteresis damping effects, energy conversion, and failure modes.
TL;DR: In this article , the influence of temperature on the energy storage and dissipation characteristics and rockburst proneness of pre-heated granites has been explored and quantitatively calculated using the linear energy storage law.
Abstract: Many underground engineering projects show that rockburst can occur in rocks at great depth and high temperature, and temperature is a critical factor affecting the intensity of rockburst. In general, temperature can affect the energy storage, dissipation, and surplus in rock. To explore the influence of temperature on the energy storage and dissipation characteristics and rockburst proneness, the present study has carried out a range of the uniaxial compression (UC) and single-cyclic loading–unloading uniaxial compression (SCLUC) tests on pre-heated granite specimens at 20 °C–700 °C. The results demonstrate that the rockburst proneness of pre-heated granite initially increases and subsequently decreases with the increase of temperature. The temperature of 300 °C has been found to be the threshold for rockburst proneness. Meanwhile, it is found that the elastic strain energy density increases linearly with the total input strain energy density for the pre-heated granites, confirming that the linear energy property of granite has not been altered by temperature. According to this inherent property, the peak elastic strain energy of pre-heated granites can be calculated accurately. On this basis, utilising the residual elastic energy index, the rockburst proneness of pre-heated granite can be determined quantitatively. The obtained results from high to low are: 317.9 kJ/m 3 (300 °C), 264.1 kJ/m 3 (100 °C), 260.6 kJ/m 3 (20 °C), 235.5 kJ/m 3 (500 °C), 158.9 kJ/m 3 (700 °C), which are consistent with the intensity of actual rockburst for specimens. In addition, the relationship between temperature and energy storage capacity (ESC) of granite was discussed, revealing that high temperature impairs ESC of rocks, which is essential for reducing the rockburst proneness. This study provides some new insights into the rockburst proneness evaluation in high-temperature rock engineering. • The temperature does not change the pre-heated granite possess the linear energy storage law. • The peak strain energy of pre-heated granite is quantitatively calculated using the linear energy storage law. • The rockburst proneness of pre-heated granite at different temperatures can be accurately evaluated by the A EF . • The rockburst proneness of pre-heated granite initially increases and then decreases with the temperature increasing. • The rockburst proneness of pre-heated granite at 300 °C is the highest.
TL;DR: In this paper , the optimal design and seismic performance of TVMD and NSAD from the point of soil-structure-interaction (SSI) was discussed, which further affects the energy dissipation capabilities and the seismic performance.
TL;DR: In this article , a review of the application of dissipation engineering to quantum error correction, quantum sensing and quantum simulation is presented, highlighting the role of such tools in quantum simulation and error correction.
Abstract: Quantum information processing relies on the precise control of non-classical states in the presence of many uncontrolled environmental degrees of freedom. The interactions between the relevant degrees of freedom and the environment are often viewed as detrimental, as they dissipate energy and decohere quantum states. Nonetheless, when controlled, dissipation is an essential tool for manipulating quantum information: dissipation engineering enables quantum measurement, quantum-state preparation and quantum-state stabilization. The advances in quantum technologies, marked by improvements of characteristic coherence times and extensible architectures for quantum control, have coincided with the development of such dissipation engineering tools that interface quantum and classical degrees of freedom. This Review presents dissipation as a fundamental aspect of the measurement and control of quantum devices, and highlights the role of dissipation engineering in quantum error correction and quantum simulation. Controlled dissipation can be used to protect quantum information, control dynamics and enforce constraints. This Review explains the basic principles and overviews the applications of dissipation engineering to quantum error correction, quantum sensing and quantum simulation.
TL;DR: In this paper , a serious of Co/Ni NPs decorated porous carbon sphere were successfully prepared via a combined method of activation, hydrothermal and annealing process, by controlling the addition amount of activator and the concentration of precursor, the appropriate morphology and impedance matching can be obtained in the as-prepared hybrid.
TL;DR: In this article , the authors proposed new reasonable performance measures and new design criteria of the nonlinear energy sink (NES) in harmonic excitation, and the results show that the energy dissipation rate of the NES is not competent to evaluate the performance of the NES in the presence of small and large excitation amplitudes, respectively.