Temperature field research for main propulsion motor of unmanned aerial vehicle based on fluid-solid coupled theory
According to the fluid-solid heat transfer theory,taking the main propulsion motor( MPM) of Unmanned Aerial Vehicle( UAV) as the object of study,the fluid-solid coupled physical and mathematical models were established under the strong cooling condition combining the ventilation and structure characteristics of MPM. The method of temperature field calculation is proposed,and temperature distribution of MPM at rated condition,temperature distribution of MPM at axis section view and temperature rise change rule for main parts of PMM were obtained under different flight conditions. The wind tunnel and flight tests of MPM were performed,and the theoretical analysis was compared with the test,which proved the correctness of analyzed method. The works provide a theoretical basis for the temperature field research and optimal design for MPM of UAV.
This article explores the development of partnership-based approaches to industrial relations at the British workplace. Drawing empirically from a unique data set of Manufacturing, Science and Finance Union (MSF) workplace representatives and a workplace case study, the article explores the attitudes and experiences of trade unionists to partnership and assesses the level of support and voice mechanisms open to them in furthering the partnership agenda. The study shows that while MSF representatives appear open to the responsibilities placed upon them in the rhetoric of partnership, there is little evidence to suggest that management has reciprocated.