Reduced inertial parameters in system of one degree of freedom obtained by Eksergian's method

Foix, Salvador Cardona; Nebot, Lluïsa Jordi; Puig-Ortiz, Joan

doi:10.5194/ms-8-91-2017

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…where F i is the inertial force and F m is the weight of the displaced reduced mass to the cylinder rod, considered constant. For the calculus of the inertial force, the general relationship between force and a reduced mass m reduced , for single degree of freedom systems, such as the studied one, is established according to the well-known Eksergian equation [21,22]:…”

Section: Cylinder Rodmentioning

confidence: 99%

Simulation of Hydraulic Cylinder Cushioning

Algar¹,

Freire²,

Castilla³

et al. 2021

Sustainability

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The internal cushioning systems of hydraulic linear actuators avoid mechanical shocks at the end of their stroke. The design where the piston with perimeter grooves regulates the flow by standing in front of the outlet port has been investigated. First, a bond graph dynamic model has been developed, including the flow throughout the internal cushion design, characterized in detail by computational fluid-dynamic simulation. Following this, the radial movement of the piston and the fluid-dynamic coefficients, experimentally validated, are integrated into the dynamic model. The registered radial movement is in coherence with the significant drag force estimated in the CFD simulation, generated by the flow through the grooves, where the laminar flow regime predominates. Ultimately, the model aims to predict the behavior of the cushioning during the movement of the arm of an excavator. The analytical model developed predicts the performance of the cushioning system, in coherence with empirical results. There is an optimal behavior, highly influenced by the mechanical stress conditions of the system, subject to a compromise between an increasing section of the grooves and an optimization of the radial gap.

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Section: Cylinder Rodmentioning

confidence: 99%

Simulation of Hydraulic Cylinder Cushioning

Algar¹,

Freire²,

Castilla³

et al. 2021

Sustainability

View full text Add to dashboard Cite

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Numerical Simulation of Drive Cycles for Formula Electric Vehicle Comparative Powerflow Analysis

Rodrigues,

Silveira

2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">This paper proposes a theoretical drive cycle for the competition, considering the battery pack project under design. The vehicle has a non-reversible, double-stage gear train, created without a dynamic investigation. To evaluate the effect on performance, several ratios were analyzed. Dynamic model uses Eksergian’s Equation of Motion to evaluate car equivalent mass (generalized inertia), and external forces acting on the vehicle. The circuit is divided into key locations where the driver is likely to accelerate or brake, based on a predicted behavior. MATLAB ODE Solver executed the numerical integration, evaluating time forward coordinates, creating the drive cycle. Linear gear train results provided data as boundary conditions for a second round of simulations performed with epicyclic gear trains. Model is updated to include their nonlinearity by differential algebraic equation employment with Lagrange multipliers. All data undergoes evaluation to ascertain the mechanical and electrical power requirements. Subsequent analysis aims to comprehend the peak electrical current and energy storage demands of the battery pack, ensuring the car performs in competition as simulated. Whereas reference gear train ratio returns a good time frame, its energy usage surpasses competition rules. Other implemented ratios demonstrated whether an improvement in time frame or an improvement in energy usage. Upgrading one downgrades the other, for instance, speed reduction of 6.0:1 needs 60% more time for a lap than the fastest, but has the lowest energy usage. This behavior justifies epicyclic gear train investigation. Comparison of both models indicate enough evidence that car performance improves with epicyclic gear train appliance. Epicyclic gear train enhances power flow while improving energy management. It can be up to 16 seconds faster (Np=3 v3) than the reference train (9.0:1) and uses nearly the same amount of energy as 6.0:1 ratio.</div></div>

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Reduced inertial parameters in system of one degree of freedom obtained by Eksergian's method

Cited by 2 publications

References 12 publications

Simulation of Hydraulic Cylinder Cushioning

Simulation of Hydraulic Cylinder Cushioning

Numerical Simulation of Drive Cycles for Formula Electric Vehicle Comparative Powerflow Analysis

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