Modeling and Analysis of the Impact of Charging Electric Charged Vehicles on the Grid Load in the Expressways

During the last few decades, electric vehicles (EVs) have emerged as a promising sustainable alternative to traditional fuel cars. The work presented here is carried out in the context of the Horizon 2020 project MERLON and targets the impact of EVs on electrical grid load profiles, while considering both grid-to-vehicle (G2V) and vehicle-to-grid (V2G) operation modes. Three different charging policies are considered: the uncontrolled charging, which acts as a reference scenario, and two strategies that fall under the umbrella of individual charging policies based on price incentive strategies. Electricity prices along with the EV user preferences are taken into account for both charging (G2V) and discharging (V2G) operations, allowing for more realistic scenarios to be considered.

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Numerical modeling and analysis of the noncontacting impulse gas face seals

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650118817188 ◽

2018 ◽

Vol 233 (8) ◽

pp. 1139-1153

Author(s):

Slawomir Blasiak

Keyword(s):

Computer Software ◽

Surface Modifications ◽

Mechanical Seals ◽

Face Surface ◽

Modeling And Analysis ◽

C Language ◽

Model Studies ◽

Face Seals ◽

Radial Gap ◽

The Impact

Noncontacting mechanical seals with various kinds of face surface modifications have established their position in the sealing technique. Over the last few years, a lot of works dedicated to the impact of various surface modifications on the dynamics of working rings have been created. This paper presents model studies regarding relatively unknown noncontacting impulse gas face seals. Here, a mathematical model of impulse gas face seals is developed including the nonlinear Reynolds equation and stator dynamics equations, which were solved simultaneously using numerical methods. An original computer software written in C + + language was developed. A number of numerical tests were conducted and the phenomena occurring in the radial gap during seal operation were analyzed. Final conclusions were drawn and several features were indicated characterizing impulse face seals. It should be emphasized that numerical research on this type of seals has not been published yet. The literature usually presents simplified models for the noncompressible medium, which can be solved with the use of analytical methods.

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Modeling and analysis of soft robotic fingers using the fin ray effect

The International Journal of Robotics Research ◽

10.1177/0278364920913926 ◽

2020 ◽

Vol 39 (14) ◽

pp. 1686-1705

Author(s):

Xiaowei Shan ◽

Lionel Birglen

Keyword(s):

Contact Forces ◽

Accurate Estimation ◽

Modeling And Analysis ◽

Physical Experiments ◽

Fin Ray ◽

And Performance ◽

Difficult Challenge ◽

Kinetostatic Model ◽

Individual Contact ◽

The Impact

Soft grasping of random objects in unstructured environments has been a research topic of predilection both in academia and in industry because of its complexity but great practical relevance. However, accurate modeling of soft hands and fingers has proven a difficult challenge to tackle. Focusing on this issue, this article presents a detailed mathematical modeling and performance analysis of parallel grippers equipped with soft fingers taking advantage of the fin ray effect (FRE). The FRE, based on biomimetic principles, is most commonly found in the design of grasping soft fingers, but despite their popularity, finding a convenient model to assess the grasp capabilities of these fingers is challenging. This article aims at solving this issue by providing an analytic tool to better understand and ultimately design this type of soft fingers. First, a kinetostatic model of a general multi-crossbeam finger is established. This model will allow for a fast yet accurate estimation of the contact forces generated when the fingers grasp an arbitrarily shaped object. The obtained mathematical model will be subsequently validated by numerically to ensure the estimations of the overall grasp strength and individual contact forces are indeed accurate. Physical experiments conducted with 3D-printed fingers of the most common architecture of FRE fingers will also be presented and shown to support the proposed model. Finally, the impact of the relative stiffness between different areas of the fingers will be evaluated to provide insight into further refinement and optimization of these fingers.

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Modeling and Analysis of Single Hydraulic Props in Coal Mines

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.693.364 ◽

2016 ◽

Vol 693 ◽

pp. 364-372

Author(s):

Tao He ◽

Cao Feng Yu ◽

Xiao Lei Wu ◽

Hai Shun Deng

Keyword(s):

Support System ◽

Safety Valve ◽

Impact Load ◽

Dynamic Performance ◽

Core Stability ◽

Mine Safety ◽

Dead Volume ◽

Modeling And Analysis ◽

Hydraulic Prop ◽

The Impact

This research is focused on dynamic performance of water hydraulic single hydraulic prop, the mathematical and AMESim model of single hydraulic prop are established. And the drop hammer is introduced to simulate the impact load of the surrounding rock acting on the prop. The performance parameters of prop retract displacement and cavity pressure are used as the research objects. The working process of single hydraulic prop is reproduced by the simulation. And the influence of safety valve parameters on the support system is analyzed. The results show that: increasing maximal valve core stroke and dead volume or reducing valve damping hole diameter can improve the support performance of the single hydraulic prop. But the influence of equivalent damping has two sides. For support system, decrease damping can improve the support performance, but for the safety valve, reduce the damping make the valve core stability decline. In addition, the pressure overshoot of the optimized system is 18.3%, adjusting time is 0.5s and the retract displacement is 10mm. The dynamic performances meet the technology requirements of the coal mine safety production of China.

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Modeling and Analysis of a Ball and Beam System Including Impacts and Dry Friction

Volume 8: 26th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2014-34529 ◽

2014 ◽

Author(s):

Diego Colón ◽

Átila Madureira Bueno ◽

Ivando S. Diniz ◽

Jose M. Balthazar

Keyword(s):

Differential Inclusion ◽

Dry Friction ◽

Viscous Friction ◽

Mathematical Object ◽

Contact Forces ◽

Modeling And Analysis ◽

Typical Situation ◽

Beam System ◽

The Impact ◽

Ball And Beam System

The Ball and Beam system is a common didactical plant that presents a complex nonlinear dynamics. This comes from the fact that the ball rolls over the beam, which rotates around its barycenter. In order to deduce the system’s equations, composition of movement must be applied, using a non-inertial reference frame attached to the beam. In the Literature, a common hypothesis is to suppose that the ball rolls without slipping. If a viscous friction is supposed to be present, a simpler situation is obtained, where Lagrangean mechanics can be applied, and no contact force is known. Even then, the dynamics is very nonlinear. However, this model does not include all the relevant phenomena, such as ball’s slipping at higher beam’s inclination angles, dry friction between the ball and the beam, and impacts between: 1) the ball and the ends of the beam, and 2) the beam and the base (ground). These additions to the model impose the necessity to calculate, in a simulation setting, the contact forces, and the Newton’s approach to determine the system’s equations becomes more convenient. Also, discontinuities in the model are introduced, and the simpler mathematical object for model such systems are the differential inclusion systems. In this work, we deduce the Ball and Beam differential inclusion system, including dry friction and the impact between the ball and beam. We also present simulation results for the corresponding differential inclusion system in a typical situation.

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Modeling and Analysis on the Rotation Accuracy of Lathe Spindle

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.1757 ◽

2012 ◽

Vol 602-604 ◽

pp. 1757-1760

Author(s):

Qiang Huang ◽

Kun Wei

Keyword(s):

Influence Factors ◽

Cumulative Effect ◽

Structure Characteristic ◽

Analysis Method ◽

Error Sources ◽

Modeling And Analysis ◽

Spindle Rotation ◽

Machine Spindle ◽

Center Track ◽

The Impact

The rotation accuracy of the machine spindle is an important accuracy index, and has numerous influence factors. According to the structure characteristic of the spindle system, an integrated model of the spindle rotation error is established in this paper. By this model, the impact law and cumulative effect of various error sources on spindle rotation accuracy can be analyzed. Taking the lathe spindles as an example, the modeling and analysis method for spindle error are introduced. Visualization of spindle center track is achieved by programming.

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Modeling and Analysis of a CNG Residential Refueling System

Volume 3: Industrial Applications; Modeling for Oil and Gas, Control and Validation, Estimation, and Control of Automotive Systems; Multi-Agent and Networked Systems; Control System Design; Physical Human-Robot Interaction; Rehabilitation Robotics; Sensing and Actuation for Control; Biomedical Systems; Time Delay Systems and Stability; Unmanned Ground and Surface Robotics; Vehicle Motion Controls; Vibration Analysis and Isolation; Vibration and Control for Energy Harvesting; Wind Energy ◽

10.1115/dscc2014-6160 ◽

2014 ◽

Cited By ~ 10

Author(s):

Hyo Joon Bang ◽

Stephanie Stockar ◽

Matteo Muratori ◽

Giorgio Rizzoni

Keyword(s):

Natural Gas ◽

Electric Power ◽

The United States ◽

Market Penetration ◽

Compressed Natural Gas ◽

Modeling And Analysis ◽

Viable Solution ◽

Technological Barrier ◽

Power Infrastructure ◽

The Impact

Natural gas has recently been proposed as an alternative fuel for transportation in the United States. Refueling infrastructure is the major technological barrier to the market penetration of passenger compressed natural gas (CNG) vehicles. Currently, there is about one natural gas refueling station every 150 gasoline pumps. Nevertheless, natural gas is widely available in American houses, and thus distributed residential refueling is seen as a viable solution. Generally, residential CNG refueling systems use compressors driven by electric motors. With a potential increase in the number of residential natural gas refueling systems over the next few years, the additional load that this system will introduce on the electric power infrastructure can be significant. In this paper, a system dynamic model of a residential refueling system has been developed and validated against data available in the literature. Ultimately, the model will allow for exploring the impact of residential refueling of CNG vehicles on the electric power infrastructure.

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Impact of Storage Integrated Solar Photovoltaics (PV) Power System on Utility Peak Loads

ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C ◽

10.1115/es2011-54150 ◽

2011 ◽

Cited By ~ 1

Author(s):

K. Agyenim-Boateng ◽

R. F. Boehm

Keyword(s):

Large Scale ◽

Peak Load ◽

Average Energy ◽

Transient Behavior ◽

Climatic Conditions ◽

Photovoltaic System ◽

Solar Pv ◽

Pv System ◽

Grid Load ◽

The Impact

The promise of large-scale use of renewables such as wind and solar for supplying electrical power is tempered by the sources’ transient behavior and the impact this would have on the operation of the grid. One way of addressing this is through the use of supplemental energy storage. While the technology for the latter has not been proven on a large scale or to be economical at the present time, some assessments of what magnitude is required can be made. In performing this work we have used NREL’s Solar Advisor Model (SAM 2010) with TMY3 solar data to estimate the photovoltaic system power generation. Climatic conditions close to load centers were chosen for the simulations. Then the PV output for varying sizes of arrays were examined and the impact of varying amounts of storage investigated. The storage was characterized by maximum limiting energy and power capacities based on annual hourly peak load, as well as its charging and discharging efficiencies. The simulations were performed using hourly time steps with energy withdrawn from, or input to, storage only after considering base generation and the PV system output in serving the grid load. In this work, we examined the load matching capability of solar PV generation (orientated for maximum summer output) for a sample Southwestern US utility grid load of 2008. Specifically we evaluated the daily and seasonal peak load shifting with employing varying storage capacities. The annual average energy penetration based on the usable solar PV output is also examined under these conditions and at different levels of system flexibility.

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