空调压缩机离合器吸盘螺栓断裂的研究

本文针对不常见的的汽车空调压缩机离合器吸盘螺栓断裂问题进行调查和改进过程说明,通过对失效零部件原材料、生产装配过程、返修过程进行调查分析,并通过标杆对比识别差异点,从而最终判定出问题症结所在。     

汽车空调电磁离合器的检测与检修

本文阐述了汽车空调压缩机电磁离合器常见的故障,分析故障的原因,进而总结电磁离合器的检测与检修的方法,从而为读者使读者更进一步了解电磁离合器的工作原理及故障处理办法,为今后的生活带来更大的便利。     

基于Maxwell 3D的汽车空调压缩机电磁离合器电磁力仿真研究

以SEBX15汽车空调压缩机为设计原型,应用Ansoft Maxwell对基于三维静磁场的汽车空调压缩机电磁离合器的电磁力进行仿真计算,旨在研究线圈安匝数、气隙、吸盘隔磁槽槽宽、间距和内圈半径等几个因素对电磁离合器所产生的电磁力的影响,为汽车空调压缩机电磁离合器的设计和选配工作提供理论依据。     

雅阁空调电脑维修案例

随着现代汽车电子技术的发展,在汽车的空调系统中,无论是手动控制还是自动控制的空调,其压缩机电磁离合器的切断与接合一般都史现了电脑进行控制。     

商用空调压缩机的噪声特性测试与控制

对某型号商用空调压缩机在不同频率下工作的噪声进行测试,并分析压缩机的噪声频谱特性。结合实际安装时的限制条件,制定相应的压缩机隔声罩噪声控制方案,利用声学仿真技术预测采用压缩机隔声罩降噪的可行性。经实际声学测试对比,优选两种材料作为隔声罩的主体。实际实验表明,在空调机组左、右、后方三个测点平均降噪约6 d B,在机组正前方降噪量为1 d B到4 d B不等。由此,可确认PVC/PET纤维吸隔声复合材料的隔声罩能有效降低压缩机噪声和空调机组的噪声。     

Modelling the influence of microstructural morphology and triple junctions on hydrogen transport in nanopolycrystalline nickel

Hydrogen transport in nanopolycrystalline (NPC) face centred cubic (FCC) nickel has received considerable attention as a result of the material's unique structural embrittlement behaviour. Triple junctions, where three grain boundaries meet, play an important role in hydrogen diffusion. Experiments have indicated that hydrogen transport at a triple junction (TJ) is orders of magnitude greater. In this contribution, a multiphase NPC model is proposed and used to investigate the influence on hydrogen transport of TJs within the surface of the NPC nickel using finite nanostructural element analyses. This 2D multiphase NPC model increases the density of triple junctions as the grain size reduces. The multiphase NPC model consists of two phases comprising nano grain interiors (GI) and intergranular phases. The intergranular (Ig) phase is divided into grain boundary affected zones (GBAZ) regions and TJ regions. The results of this finite nanostructural analysis show that hydrogen transport is enhanced at TJs and the bulk diffusion of hydrogen in NPC material is faster as the volume fraction of TJ increases and nano grain size decreases. The accumulation of hydrogen in three phase (GI, GBAZ, and TJ) microstructures is higher than the two phase (GI and Ig) microstructure case. The accumulation of hydrogen in TJ and Ig are heterogeneous in NPC nickel. The importance of the microstructural morphology in terms of the presence of pores, fine grains in TJ, changes in the shape of TJ with changes in the density of TJ and a TJ effect related to hydrogen transport in NPC nickel is all evidenced. This means that the TJ and microstructural morphology cannot be neglected when predicting hydrogen transport in a NPC nickel.     

Determination of ply level residual stresses in a laminated carbon fibre-reinforced epoxy composite using constant,linear and quadratic variations of the incremental slitting method

Measurement of residual stresses in FRP composites is by no means a trivial task and there are no commonly applied or standardised methods currently available. As a result, characterisation of residual stresses is often avoided, resulting in the use of conservative safety margins, which has consequently resulted in structures being overdesigned. In the work described here, the incremental slitting method has been demonstrated to be a technique suitable for measuring residual stress in thin (∼0.3 mm) plies of a [0°₂/90°₂]_4s carbon fibre-reinforced epoxy laminate. The stresses measured using a constant stress approximation approach provided the best agreement with measurements obtained using the layer removal technique and stresses predicted using a semi-coupled transient-thermal and structural model.