Current Issue : January - March Volume : 2020 Issue Number : 1 Articles : 5 Articles
Extremely low frequency (ELF) magnetic field (MF) exposure in electric vehicles (EVs) has\nraised public concern for human health. There have been many studies evaluating magnetic field\nvalues in these vehicles. However, there has been no report on the temporal variation of the magnetic\nfield in the cabin. This is the first study on the long-term monitoring of actual MFs in EVs. In the\nstudy, we measured the magnetic flux density (B) in three shared vehicles over a period of two years.\nThe measurements were performed at the front and rear seats during acceleration and constant-speed\ndriving modes. We found that the B amplitudes and the spectral components could be modified by\nreplacing the components and the hubs, while regular checks or maintenance did not influence the B\nvalues in the vehicle. This observation highlights the necessity of regularly monitoring ELF MF in\nEVs, especially after major repairs or accidents, to protect car users from potentially excessive ELF\nMF exposure. These results should be considered in updates of the measurement standards. The ELF\nMF effect should also be taken into consideration in relevant epidemiological studies....
Electric vehicles have gained more and more attention because of the serious oil crisis and\nenvironmental problems. However, the disadvantages of the electric vehicle, such as short driving\nrange, high battery cost, and inconvenient charging, are hindering its market development and\nexpansion. The realization of on-road wireless power transfer technology can effectively solve the\nproblems of short driving range, prevent the battery from being completely discharged to prolong its\nservice life, and reduce requirement of on-board battery. In this paper, the charging mode and the\ncompensation topology of wireless power transfer technology are discussed and then the equivalent\ncircuit model of segmental wireless power transfer system is built. We carried out some magnetic\nfield simulation to analyze how the track shape and length influence coupling coefficient, which is\nlater verified by experiments....
According to the composition and the principle of the liquid-electric energy-\nsensing damper, the corresponding hydraulic regenerative model is designed.\nIn this paper, an advanced type of shock absorber combined with the\nmechanical and electromagnetic hydraulic structure has been proposed that\nrecycles the energy dissipated by shock absorber in the driving process. In\naddition, the damping characteristics of the conventional mechanical vehicle\nand the advanced hydraulic regenerative mechanical vehicle have been analyzed\nby using AMESim simulation. The regenerative suspension is reformed\nfrom the traditional hydraulic and pneumatic suspension. The suspension\nabsorbs kinetic energy converts it into hydraulic potential and pneumatic\npower to be stored in the accumulator. The kinetic energy is then converted\ninto electricity instead of heat by using the hydraulic suspension and Power-\nGenerating Shock Absorber (PGSA). The AMESim simulation results have\nefficiently verified the displacement characteristics curves and flow rate of\nhydraulic fluid in the body. Finally the conversion of energy produced by advanced\nhydraulic regenerative mechanical vehicle transferred into electrical\nenergy. The designed hydraulic shock absorber allows a significant fuel saving\nof 1.5% to 4% depending on the vehicle and driving conditions....
Based on the working environment and control strategy of the leakage current particulate sensor on the diesel engine, the ANSYS\nfinite element simulation is applied to prove the reliability of the sensor in the response phase. It shows that the full load conditions\nof the diesel engine harsh the exhaust environment, which leads to higher thermal stress in the sensor. The temperature of the front\nend of the sensor base is up to 227DegreeC, and the highest thermal stress appearing in the sensor is 88 MPa. Both of them are lower than\nthe upper limit request, which guarantees the working reliability of the sensor in long period. The effect of outside environment on\nthe highest temperature of the sensor base is also investigated, and it shows that the lower temperature and the higher convective\nheat transfer coefficient would be in favor of the reliable work of the sensor. In addition, it shows that the cold start time of the\nsensor is reducing exponentially with the increasing heating power, and the optimum heating power is 60W taking the linearly\nincreasing thermal stress into consideration....
The paper focuses on the vibration analysis of a vehicle equipped with two identical\nengines. Such solutions are encountered in practice when less power is needed for a vehicle for a\ncertain period of time and then greater power the rest of the time. An example of this would be a\nmobile drilling rig. During transport (a relatively short period of time) only one engine operates\nand then, in service (most of the operating time), both engines operate. A characteristic of such an\naggregate is the existence, within the transmission, of two identical engines. The existence of identical\nparts in mechanical systems leads to properties that allow the computations to be simplified in order\nto obtain suggestive and rapid results, with reduced computation effort. These properties refer to\nthe eigenvalues and eigenmodes of vibration for these types of systems and have been stated and\ndemonstrated in the paper. It also allows for a qualitative analysis of the behavior of the system in\ncase of vibrations. The existence of these properties allows for easier calculation and shortening of\nthe design time. The mechanical consequences of the existence of symmetries or identical parts have\nbegun to be studied in more detail in the last decade (see references), and the work is part of these\ntrends. The vibration properties of a transmission of a truck with two identical engines have been\nstated and proven and a real example is analyzed. Two 215 hp engines were used in the application.\nIn order to establish a useful solution in practice, two constructive variants with a different clutch\nposition in the transmission are analyzed in parallel....
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