Dynamic analyses for the rotor-journal bearing system of a variable speed rotary compressor

In the rotary compressor, the rolling piston and the contacted rotor-journal bearing system are main moving components. They suffer very large periodically varying loads introduced by the inertia force, the contact force and the gas force. These loads change rapidly with speed variation of the compressor. They always lead to serious vibration of the system, and then result in abrasion and performance reduction. In this paper, the dynamic behavior of the rotor-journal bearing system were calculated by solving three-dimensional numerical model using finite element method, and the vibration characteristics of the system were investigated according to the calculation results. The natural frequencies and vibration modes were obtained. The stress, displacement and axis orbit of the rotor center were calculated considering the speed variation of the motor. Via the established numerical model, vibration characteristics of a newly designed compressor can be predicted, and optimization can be done to reduce the vibration.     

新型节能技术在对开门冰箱上的运用研究

在对开门冰箱设计过程中,采用新的节能技术,同时引进先进的实验分析手段,通过优化冰箱保温层材料配方,减小冰箱发泡层的泡孔直径,降低发泡料的导热系数;其次通过改善门封结构设计减小通过门封进入冰箱的负荷量;同时通过提高制冷系统的制冷效率和换热效率以及优化冰箱PCB的控制方法,从原理分析和实验验证进行充分的论证,使对开门冰箱的耗电量降低20％左右。通过以上措施对开门冰箱能效指数比国家1级能耗要求低20％,达到国家超级节能产品的要求。     

Gestörter Bauablauf — Baubetriebliche Ermittlung von Bauzeitverlängerungen und Berechnung der Mehrkosten

Der Nachweis des gestörten Bauablaufs ist die schwierigste Herausforderung für Baubetriebler. Dies liegt nicht nur an der Komplexität gestörter Bauabläufe großer Projekte, sondern vor allem an den Anforderungen, die Baujuristen an den Nachweis stellen. Disturbed construction process — Determination of extra construction time and calculation of the additional costs of construction. The detection of the disturbed construction process is the most difficult challenge for construction managers. This is not only because of the complexity of disturbed construction processes of large projects, but primarily because of the requirements of demonstration for the legal experts in construction.     

Schrägseilbrücke für Straßenbahn‐, Geh‐ und Radverkehr

Cable‐stayed bridge for tramway, pedestrians, and bike traffic. For the development of the new quarter “Parkstadt Schwabing” in den North of Munich, the transport connection is established by a new tramway, the line 23. Thereby, a new bridge construction became necessary for the crossing of the main circular roadway “Mittlerer Ring” at the Schenkendorfstraße. The extraordinary bridge structure in direct conjunction with the glass enclosure of the Petuel‐tunnel belongs to the most spectacular metropolitan crossing locations of Munich.     

交换机例测报告自动采集与分析系统的设计实现

文章介绍了交换机例测报告自动采集入库的实现方法以及在此基础上的自动分析与告警展现.