Papers by Keyword: Dynamic Performance

Abstract: This paper presents the design, modeling, and analysis of a solar-powered geared tricycle intended to provide an efficient, eco-friendly alternative for personal mobility. The work integrates mechanical, electrical, and structural engineering principles to ensure dynamic performance, structural integrity, and overall stability under varying operational conditions. A lightweight chassis, optimized using finite element analysis (FEA), is designed to withstand dynamic loads while maintaining low energy consumption. The drive system incorporates a multi-speed gear mechanism coupled with a high-efficiency brushless DC motor powered by a photovoltaic (PV) array and battery storage system, enabling hybrid propulsion. The dynamic behaviour of the tricycle, including acceleration, turning, and braking responses, is simulated using MATLAB/Simulink to evaluate performance across urban terrains. Stability is assessed through center-of-gravity analysis, roll-over threshold calculations, and tilt angle monitoring to prevent tipping during sharp maneuvers. The integration of solar technology not only extends operational range but also reduces environmental impact, making the design suitable for sustainable transportation in developing and urban regions.

Abstract: The emerging field of soft robots offers the prospective of applying soft actuators as artificial muscles, replacing traditional actuators based on hard materials. Dielectric elastomers (DE), one class of electro-active polymers, represents an attractive technology for the realization of mechatronic actuators, due to their light weight, high energy efficiency and scalability. This work aims at investigating and characterizing a novel design of membrane DE in-plane actuator by magnetic mechanism. A nonlinear dynamic model of the dielectric elastomer actuator (DEA) is established and corresponding material parameters are identified. Natural frequency and response speed of DEAs are studied. It demonstrates that larger stretch and higher response speed can be realized by the proposed DEA.

Abstract: Carbon black ( CB ) and silica were used as two-component fillers to enhance the practicability of rubber. In this study, the microstructure, mechanical and dynamic properties of solution-polymerized styrene-butadiene rubber ( SSBR ) vulcanizates filled with carbon black and silica were characterized. 50 phr of total hybrid fillers was used as the base. A series of experiments with different ratios of CB/silica were carried out to determine the best contribution to the performance of SSBR vulcanizates. The studies have shown that when the vulcanizates exhibited the better overall mechanical and dynamic performance with 20 phr silica loading and 30 phr CB loading.

Abstract: Space deployable mechanisms have been widely employed in aeronautic industry, and the dynamic performance of the space deployable mechanisms become increasingly important. In this paper, the model of space deployable mechanism with double clearances is established by the multi-body program ADAMS. The deployable mechanism with ideal joint, single clearance joint and double clearance joints are simulated to investigate the effects of double clearance on the dynamic performance of the deployable mechanism. The results reveal that the coupler of double joint clearance has significant influence on dynamic performance of deployable mechanism. The results of simulation could help to predict the joint vibration in space deployable mechanisms.

Abstract: 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.

Abstract: The AlCl₃/Ti co-doped 4MgH₂-Li₃AlH₆ has been successfully synthesized using solid ball-milled method. The effect of AlCl₃/Ti and different preparation conditions on reversible hydrogen storage of 4MgH₂-Li₃AlH₆ were investigated. It was found that the formed Al₃Ti and Al can improve the de/rehydriding performance. The onset temperature of the system dehydrogenation decreased to 58 °C, and it can release hydrogen of 7.2 wt.% at 400 °C. The hydriding of the system was found that the adsorption rate greatly increased from 0.02 to 0.35 wt.% min^-1. The activation energy (E_a) of MgH₂ dehydrogenation decreased from 147 to 113.7 kJ mol^-1 by adding additive AlCl₃ and Ti. The AlCl₃/Ti improved the thermodynamic and kinetic performance of the 4MgH₂-Li₃AlH₆ composite, which was attributed to the high catalytic activity of Al₃Ti and Al.

Abstract: The era of high speed railway has come and the most important issue of the high speed train is the safety, which is directly related to billions of families. One of the most serious threats to the safety of the high speed train is the vibration of train body at curve track, which may cause the train off the track. Semi-active vibration control method is a possible solution compared with active control method which has robust problem and passive control method which has efficiency issue. Magnetorheological technology is a typical semi-active vibration control method which has been widely used in the automobile, architectural construction and aerospace. The high speed train using magnetorheological technology has not been fully investigated especially for the dynamic performance at curve track. In this paper, a high-speed train model with MRF dampers is simulated by a combined ADAMS and MATLAB simulation. The dynamic performance of high speed train operating at different speeds and turning radius is investigated to reveal the mechanism of how the MRF damper affects the train’s stability and vibration. The results show that the semi-active suspension installed with MRF dampers substantially improves the stability and dynamic performance of the train at curve track.

Abstract: To meet the increasingly stringent environmental protection regulations, there had emerged several technologies in the electrification of powertrains in hybrid vehicle, such as HEV and EV. However, these also led to increasing costs which could greatly affect the markets. So, here introduce a new type of full-hybrid powertrain that combines a petrol engine and a compressed air energy storage unit instead of a battery, offering an alternative to electric hybrid solutions. This paper laid the emphasis on the multi-domain modeling and simulation of a hydro-pneumatic accumulator system, and then continues to study its dynamic behavior of the compressed air and output performance of the pump/motor with simulation. Results show that the system possesses a high applied value in a given hybrid air system.

Abstract: A new type powertrain system architecture for city electric bus was introduced, which combines the function of Extended-Range Electric Vehicle (E-REV) and Plug-in Hybrid Electric Vehicle (P-HEV). Five driving modes were designed and its dynamics were analyzed. Numerical method on dynamics was proposed. The dynamic performance parameter of five drive modes were calculated and analyzed. The results indicate that the dynamic performance reaches the limit value at full drive mode and meet the requirement of city bus.

Abstract: s: According to the design requirements of pure electric light off-road vehicle in the initial stage of development, parameter values of the main parts of the vehicle drive system are selected after theoretical calculation. With the vehicle modeling and its performance simulation on the Cruise software, indicators of its dynamics and economic performance are got and the results are compared to the design requirements, which verified the feasibility of Cruise software application in the electric vehicle drive system development.