In order to ensure the stability of the aerospace power system in the harsh working environment and identify the weak point of the system which leads to the bad outcomes and instability of the system, the concept of power circuit fragility is raised in this paper with a thorough analysis of the stability of the aerospace power circuit. The node-index evaluation model is established based on the basic cause of the circuits stability problem. Combined with the description of the actual values of the electronic components using ternary interval number, the mathematical expression of the power supply circuits fragility is given. Taking the Superbuck aerospace power circuit as an example, this paper uses the node-index evaluation model to analyze the fragility of phase margin and overshoot, identifies the weak point of the power circuit and gives the quantization value of the phase margin and overshoot fragilities, which provides the theoretical basis for subsequent maintenance and power supply design.
To improve the measuring efficiency of width and thickness of tire tread in the process of automobile tire production, the actual condition for the tire production process is analyzed, and a fast online measurement system based on moving tire tread of tire specifications is established in this paper. The coordinate data of tire tread profile is acquired by 3D laser sensor, and we use C# language for programming which is an object-oriented programming language to complete the development of client program. The system with laser sensor can provide real-time display of tire tread profile and the data to require in the process of tire production. Experimental results demonstrate that the measuring precision of the system is ≤ 1mm, it can meet the measurement requirements of the production process, and the system has the characteristics of convenient installation and testing, system stable operation.