连铸结晶器拉坯阻力的频谱分析及在漏钢预报中的应用

【作者】 王刚；

【导师】 杨建华；

【作者基本信息】 大连理工大学 ， 控制理论与控制工程， 2003， 硕士

【摘要】 在现代化连铸生产中，漏钢一直是影响连铸生产及其设备寿命的一个重大因素，减少漏钢并对漏钢进行预报是冶金届的研究方向之一。本文通过研究连铸结晶器振动时产生拉坯阻力的频域特点分析，提出一套漏钢预报方案，并进一步设计了一套漏钢预报系统。本文首先对功率法所得拉坯阻力进行滤波，并在此基础上进行快速傅立叶变换，得到拉坯阻力的频域曲线。对结晶器振动给拉坯阻力带来的影响做了分析，并提出解决方法。选取振幅谱和功率谱作为进一步研究漏钢的指标，分析漏钢时指标的变化，得到漏钢时拉坯阻力频域模型。为了更加准确的描述拉坯阻力和漏钢的关系，本文还提出漏钢概率的概念。基于以上研究，本文最后设计一套拉坯阻力漏钢预报系统，并编制软件实现。并利用宝钢二号连铸结晶器的实际数据检验，证明该系统对于粘结性漏钢有很好的预报作用。更多还原

【Abstract】 In modern continuous casting industry, breakout is a significant factor to decrease productivity and the useful life of metallurgical equipments. To reduce the breakout rate in casting and to make the breakout prediction have been the crucial research topics in metallurgy. Based on the research of characteristics of mould friction in frequency-domain , a method is put forward to make prediction of breakout and a system is established . In this paper, firstly, the mould friction derived from measuring the power of mould oscillation motor is filtered; and then is transfered by FFT to get the frequency-domain characteristics. Further analysis is made on the effects that the oscillator brings to mould friction, furthermore, a resolution is proposed. Amplitude spectrum and power spectrum are chosen to make further research on breakout , and changes of these measures are analyzed whenever breakout happens, so that the breakout frequency-region model is built. In order to describe the relation between mould friction and breakout precisely ,the concept of breakout probability is brought up. In the end of this paper, a software design of the system to make prediction of breakout in mould friction is presented. The system is tested with the real data sampled from BaoShan Steel Co, Ltd, and proved to be effective on most breakouts.更多还原