Sulzer 16ZAV40S柴油机轴瓦咬合事故原因分析

就Sulzer1 6ZAV40S柴油机连杆发生大端轴瓦咬合事故 ,进行分析与探讨 ,根据现场的记录和原始资料 ,排除了一些不会导致轴瓦产生咬合的因素 ,认为连杆大端轴承座孔变形、轴承间隙过大以及连杆大端轴承紧固螺栓松弛与此次事故有密切关系。

浅析16ZAV40S柴油机飞车的原因

通过分析某16ZAV40S柴油机飞车的原因,认为在检修柴油机高压油泵时,安装调节齿条和调节套筒、调节套筒和柱塞时必须严格按照标记对号入座,否则将会造成高压油泵无法正常工作,严重的会酿成飞车事故。

苏尔寿16ZAV40S型柴油机监控保护系统的检定方法

本文论述了苏尔寿16ZAV40S型柴油机监控保护系统的工作原理,并根据其工作原理总结出监控保护系统的检定方法以及各个参数的报警值的检定方法。

Invariant properties of representations under cleft extensions

The main aim of this paper is to give the invariant properties of representations of algebras under cleft extensions over a semisimple Hopf algebra. Firstly, we explain the concept of the cleft extension and give a relation between the cleft extension and the crossed product which is the approach we depend upon. Then, by making use of them, we prove that over an algebraically closed field k, for a finite dimensional Hopf algebra H which is semisimple as well as its dual H*, the representation type of an algebra is an invariant property under a finite dimensional H-cleft extension . In the other part, we still show that over an arbitrary field k, the Nakayama property of a k-algebra is also an invariant property under an H -cleft extension when the radical of the algebra is H-stable.

Koszul algebras and finite Galois coverings

The relationships between Koszulity and finite Galois coverings are obtained, which provide a construction of Koszul algebras by finite Galois coverings.