铝合金点焊过程振动信号频谱分析

频谱分析是试验数据处理的重要方法之一。通过对铝合金点焊过程中电极振动信号的频谱分析，提取振动信号中的特征量，来判断点焊过程中熔核形成及飞溅发生。试验证明，利用振动信号的频谱分析能够有效地对铝合金点焊过程进行监控，是提高铝合金点焊质量的一种有效方法。     

煤巷大断面台阶式掘进及其支护技术的应用

为了有效提高掘进速度,增强支护强度与巷道的抗冲击性,对义煤集团跃进煤矿25110工作面运输巷掘进工艺和支护方式进行了分析,采用双掘进机台阶式掘进方法与锚网索＋36U型钢椭圆形棚复合强力支护,加快了掘进速度,确保了巷道的使用安全。     

Application of the wavelet packet and its energy spectrum to identify nugget splash during the aluminum alloys spot welding

Nugget splash during aluminum alloys spot welding has a detrimental effect on weld nugget integrity, strength and durability of the welded joints. This investigation is performed to identify nugget splash from voltage signals became these are easily accessible on-line. In the present work, we propose a novel method based on the wavelet packet transform and its energy spectrum for pattern recognition of splash signal. The result demonstrates that this novel method is more accuracy and a useful way of monitoring the spot welding quality.     

浅谈综放工作面切眼全断面一次掘进技术

利用双耙斗机掘进、双胶带运输,平行施工左右2个施工面,采用全断面一次掘进技术、复合强力支护方式,既有效加快了掘进速度,增强支护强度,又实现了工作面安装时快捷、安全,且一步到位.现结合义煤集团跃进煤矿25110工作面应用实例,介绍综放工作面切眼掘进的实际方法.