The low frequency exhaust noise of a diesel(4 85), its generation, frequency characteristics and influencing factors have been studied through theoretic calculation, analysis and experiment.
针对柴油机（4 85 ）低频排气噪声，对其产生机理、规律及其影响因素等作了理论计算、分析及实验。
A design method for low phase noise agile X-band frequency synthesizer is presented, the theoretic analysis and calculation is performed and the test results are given.
介绍一种低相噪、捷变频x波段频率综合器设计方法，并进行理论分析、计算，最后给出测试结果。
Theoretic analysis and numerical calculation was made to find out the rupture reason for a series of bolts used to fix the commute-net in plenum of altitude cell in this paper.
对高空舱整流网固定螺栓断裂原因进行了理论分析和数值计算，找出了故障原因，并提出了解决方案。
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