摘要
超流氦因其优秀的热力学特性被广泛应用于国外大型超导加速器中。随着科学研究的发展,国内对超流氦的需求也有所提高。目前制备2 K超流氦的经典方法为抽气减压制冷技术,超导加速器对该过程中氦池的压力稳定性的要求不断提高,当前主流的压力控制手段已很难满足需求。本文提出一种基于热力计算的压缩机抽气量精确调节方法,结合氦的物性和氦池内的各物性参数建立控制方程。在MATLAB中对比普通的PID调节方法与该精确调节方法的压力波动表现,证明其提高压力稳定性的作用。
Superfluid helium is widely used in superconducting accelerators due to its excellent thermody-namic properties. With the development of scientific research, the demand for superfluid helium in China has also increased. At present, the classic method for preparing 2 K superfluid helium is de-compression refrigeration technology. The requirements for the pressure stability of the helium pool in superconducting accelerators are constantly increasing, and the current mainstream pres-sure control methods are difficult to meet the requirements. This article proposes a precise ad-justment method for compressor suction based on thermal calculation, which combines the physical properties of helium and various physical parameters in the helium pool to establish a control equation. Comparing the pressure fluctuation performance of the ordinary PID adjustment method with that of the precise adjustment method in MATLAB, its role in improving pressure stability is demonstrated.
出处
《建模与仿真》
2023年第3期2799-2805,共7页
Modeling and Simulation
