按开放系统处理变质量问题

Treatment of Variable Mass Based on the Open System

已经提出的变质量系统功能关系式虽然数学上相互等价，因按合外力计算作功值而偏离实际．立足于计算外力的实际作功和内力功衡量系统的“热功转换”值，导出开放系统功能表述式，方法简单有效，更接近工程实际．

It is well known that the work- energy formula on variable mass system is of equal value in mathematics. However,there exists deviation to real value when using the outside force vector to calculate the work value. The work- energy formula of the open system is derived according to the outside force work and heat work exchange .which is highly abstract in mathematics and exact in physics.