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71.
采用RNGk-ε湍流模型与SIMPLE算法,应用CFD软件对两栖车辆仿生推进装置的翼盘在不同速度工况下进行数值模拟。通过分析不同速度工况下翼盘所能产生的推力和翼盘外流场的分布情况,直观揭示了2种翼盘的运动情况,为两栖车辆仿生推进装置的研制提供了一定的参考依据。 相似文献
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The passive suspension system of tracked vehicle is designed to get its suspension parameters based on a certain common velocity and a certain road surface roughness. Its performance optimization only exists in a certain operating mode without far-ranging adaptability. Holding the damper basic frame form and applying semi-active suspension system based on MR (magnetorheological) damper, the vehicle can keep its optimum efficiency between energy dissipation and vibration reduction in all kinds of operating modes. Theoretical analysis and experiments show that the damping performances provided by this MRF(magnetorheological fluids) vane damper are same as those provided by traditional damper, and the new damper has the better controllability and adaptability. 相似文献
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随着经济的发展和人们生活水平的提高,生产和生活的用电量也大幅度增加,在创造了经济效益和提高生活质量的同时,用电安全始终是不容忽视的问题。电力系统一旦出现问题,轻则影响正常的生产生活,重则威胁到人们的生命财产安全。为了有效预防和解决这一问题,增强电力继电保护的可靠性是切实可行的重要手段和措施。文章对电力继电保护的概念与故障诊断技术进行了分析,并且对电力继电保护故障检修的特点进行了阐述。 相似文献
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The interference of carrier magnetic field to geomagnetic field has been a difficult problem for a long time, which influences on the deviation of navigation compass and the error of geomagnetic measurement. To increase the geomagnetic measuring accuracy required for the geomagnetic matching localization, the strategy to eliminate the effect of connatural and induced magnetic fields of carrier on the geomagnetic measuring accuracy is investigated. The magnetic- dipole's magnetic field distributing theory is used to deduce the magnetic composition in the position of the sensor installed on the carrier. A geomagnetic measurement model is established by using the measuring data with the ideal sensor. Con- sidering the magnetic disturbance of carrier and the error of sensor, a geomagnetic measuring compensation model is built. This model can be used to compensate the errors of carrier magnetic field and magnetic sensor in any case and its parame- ters have clear or specific physical meaning. The experimented results show that the model has higher geomagnetic mea- suring accuracy than that of others. 相似文献
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