零变换 meaning in Chinese

null transformation

The stationary conditions of the least complementary principle had different forms . in this paper , by using the adding zero transformation and the lagrangian multiplier method , the stationary condition of the least complementary principle is derived and it satisfies the completeness of varied conditions for variational principles in elastic mechanics
最小余能原理的驻值条件也曾有过不同的提法，本文应用加零变换和拉氏乘子法推导了最小余能原理的驻值条件，它应满足弹性力学变分原理各类条件的完备性。