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排序方式: 共有3591条查询结果,搜索用时 31 毫秒
1.
《International Journal of Hydrogen Energy》2021,46(62):31788-31797
Many places experience extreme temperatures below −30 °C, which is a great challenge for the fuel cell vehicle (FCV). The aim of this study is to optimize the strategy to achieve rapid cold start-up of the 30-cell stack at different temperature conditions. The test shows that the stack rapidly starts within 30 s at an ambient temperature of −20 °C. Turning on the coolant at −25 °C show stability of the cell voltage at both ends due to the end-plate heating, however, voltage of intermediate cells fluctuates sharply, and successful start-up is completed after 60 s. The cold start strategy changes to load-voltage cooperative control mode when the ambient temperature reduced to −30 °C, the voltage of multiple cells in the middle of the stack fluctuate more drastic, and start-up takes 113 s. The performance and consistency of the stack did not decay after 20 cold start-up experiments, which indicates that our control strategies effectively avoided irreversible damage to the stack caused by freeze-thaw process. 相似文献
2.
Blowdown testing offers a cost-effective experimental tool to replicate the aerothermal conditions in numerous high speed systems. The wind tunnel must replicate the inlet operating conditions, while the spatial and time dependent inlet flow conditions should be assessed carefully. This paper provides a design methodology and rules that ensure adequate flow conditioning in high inlet pressure wind tunnels suitable for subsonic and supersonic operation with mass-flow limits ranging from 1 kg/s to 25 kg/s, Reynolds numbers from 103 (1/m) to 4x107 (1/m), and Mach numbers from 0.01 up to 6. The quality of the proposed flow conditioning system was evaluated using stereo PIV measurements combined with hotwire, Pitot probe, and total flow temperature traverses. 相似文献
3.
《International Journal of Hydrogen Energy》2020,45(38):19664-19675
The PEMFC maximum power is greatly influenced by subfreezing temperature and degradation phenomena. Therefore, a dependable model is required to estimate the power with respect to the variation of the operating conditions and state of health. Semi-empirical models are potent tools in this regard. Nonetheless, there is not much information about their cold environment reliability. This paper comprehensively compares the performance of some models (already tested in normal ambient temperature) in subfreezing condition to introduce the most reliable one for PEMFC cold start-up application. Firstly, seven models are compared regarding voltage losses and precision. Subsequently, the three most dependable ones are selected and experimentally compared at sub-zero temperature in terms of polarization curve estimation for three PEMFCs with different degradation levels. The results of this study indicate that the model introduced by Amphlett et al. has a superior performance compared to other ones regarding the characteristic's estimation in below-zero temperature. 相似文献
4.
《Mechatronics》2015
In this paper, adaptive robust control (ARC) of fully-constrained cable driven parallel robots is studied in detail. Since kinematic and dynamic models of the robot are partly structurally unknown in practice, in this paper an adaptive robust sliding mode controller is proposed based on the adaptation of the upper bound of the uncertainties. This approach does not require pre-knowledge of the uncertainties upper bounds and linear regression form of kinematic and dynamic models. Moreover, to ensure that all cables remain in tension, proposed control algorithm benefit the internal force concept in its structure. The proposed controller not only keeps all cables under tension for the whole workspace of the robot, it is chattering-free, computationally simple and it does not require measurement of the end-effector acceleration. The stability of the closed-loop system with proposed control algorithm is analyzed through Lyapunov second method and it is shown that the tracking error will remain uniformly ultimately bounded (UUB). Finally, the effectiveness of the proposed control algorithm is examined through some experiments on a planar cable driven parallel robot and it is shown that the proposed controller is able to provide suitable tracking performance in practice. 相似文献
5.
Our study provides first empirical evidence on young Russian consumers’ attitudes towards novel functional bakery products. We employ two different bakery products, namely bread rolls and biscuits, in our experimental auctions. Both products are derived from purple wheat, an old wheat variety that is naturally rich in anthocyanins (ACNs). ACNs are assumed to possess anti-inflammatory, anti-cancer, anti-diabetic and ocular-health-enhancing properties. Participants are 207 students aged 18–30 years from Moscow and Irkutsk. Our results indicate a low level of knowledge about ACNs among participants. However, our results also show that in the presence of information about the health-enhancing characteristics most participants value these products over base products. Our findings also reinforce the idea that the base product matters. Purple wheat bread rolls were better accepted than purple wheat biscuits. Moreover, our results also highlight that the information strategy matters. Participants in our study exhibited a higher willingness to pay for purple wheat biscuits under an old variety information scenario in comparison to an anthocyanin information scenario. Moreover, while our results indicate no significant difference in the perception of the anthocyanin attribute between the two cities, the perception of old grain variety products was slightly different. The share of respondents considering old variety products as healthy was significantly higher in Irkutsk, whereas the share of respondents considering these products as exclusive was significantly higher in Moscow. Thus, while planning future marketing strategies such differences in underlying motives should be taken into account. 相似文献
6.
A balcony wall type solar water heater system was designed and constructed in a high-rise building. The U-type evacuated glass tube solar collector is fixed vertically on the balcony wall. The water, heated in the solar collector, flows through the exchanger coil in the water tank and then flows back to the solar collector. With regard to the hot water supply system, the cold water, heated by the heat exchanger, is sent to the point of use. Considering storeys and water consumption pattern, four apartments are selected for testing. Meanwhile, the theoretical analysis with TRNSYS was presented. According to the experimental results, mean daily collector efficiency is about 40%. Solar fraction is high in summer and autumn for the relative high radiation and high ambient temperature. Under given conditions, the annual energy extracted from tank is 2805.3 MJ/m2, and the annual solar fraction is 40.5%. When the tank volume-to-collector area ratio is decreased to 37.5 L/m2, the solar fraction can be increased to 50%. The results show that the family to use water all day round gets higher solar fraction than the family using hot water mostly in the morning and night. 相似文献
7.
《矿业科学技术学报(英文版)》2019,29(5):771-776
A conventional contact method(using linear transducers) and a non-contact method are deployed to measure the axial and lateral deformations of large scale cylindrical cemented rockfill specimens.Experimental works incorporating two pinhole cameras to create one stereovision by digital image correlation shows that the non-contact method is as reliable for testing large cylindrical specimens as measurements done by using linear variable displacement transformer and string potentiometer. Considering this particular large specimen, the experiment resulted in the acceptable mean difference between lateral strain using both methods is 5.1 percent, and 14.5 percent for the axial strain. This occurrence is inevitable due to the heterogeneity of the concrete system and the placement of the monitoring point in digital image correlation method, although the comparison of stress-strain relationship in both methods still indicates a conformity. Based on the results of the present experiments, the authors recommend the noncontact method for a detailed investigation of the material behavior during the uniaxial compressive strength tests. Full field strain measurement enables this digital method to examine local strains near cracks at any point, a very useful tool for studying material deformation behavior. 相似文献
8.
《水科学与水工程》2020,13(3):233-242
Due to limited flow capacity and the instability of the asymmetric structure of traditional baffle dropshafts, a novel baffle dropshaft with a symmetric structure, adopting the construction shield well directly, is proposed for large-range flow discharge in deep tunnel drainage systems. In this study, a two-phase flow field of the novel baffle dropshaft with three different baffle spacings was simulated at seven different flow rates with a three-dimensional (3D) numerical model verified with experiments, to study hydraulic characteristics of this novel baffle dropshaft. The results show that the novel baffle dropshaft has a remarkable energy dissipation effect. Baffle spacing of the novel baffle dropshaft has a greater effect on flow patterns and baffle pressure distributions than the comprehensive energy dissipation rate. Flow rate is a critical issue for the selection of baffle spacing in the design. Some guidance on baffle spacing selection and structure optimization for the application of this novel baffle dropshaft in deep tunnel drainage systems is proposed. 相似文献
9.
基于仰恩大学实验室新购DVCC32-JHP型微机原理与接口技术实验平台,本文探索了微机实验课程教学改革,提出改进措施,让学生充分进行面向实际应用的实验和设计研究,有助于提高微机实验课程的教学效果,达到育人的目的。 相似文献
10.
Poornesh K. Koorata Santoshkumar D. Bhat 《International Journal of Hydrogen Energy》2021,46(7):5570-5579
The fuel cell gas diffusion media (GDM) is a highly porous carbon-fiber-reinforced thin composite layer. The experimental response of these materials is observed to be highly nonlinear at low-stress levels. The cyclic mechanical response of GDM is investigated in terms of stiffness and damage parameters. The prediction of the state of deformation in GDM is vital in relating GDM's properties to ohmic and transport losses. To this end, a compressible form of the phenomenological model is proposed to capture the experimental cyclic response accurately. The model is constituent dependent; that is, the cumulative cyclic stress-strain response of GDM is a function of individual constituent phases present in the material. These individual constituents are porous matrix and reinforced fibers. The model hence derived for a typical GDM material, can predict residual strain, hysteresis, and damage quotient associated with the stress softening. This advanced model is implemented in the numerical domain to evaluate the response of the polymer electrolyte fuel cell (PEFC) unit cell. The stress-strain distribution fields are analyzed and compared with those of conventional GDM models. The results point to a remarkable deviation from the conventional notion of structural analysis. 相似文献