Metso Develops Controller for Energy-Saving Digital Hydraulic System for Papermaking Equipment Using Model-Based Design

梅斯索（Metso）希望简化其第一个用于高级造纸机械的数字液压系统的控件的开发，测试和生产。

尽管数字液压系统比比例液压系统所需的能量和地板空间更少，但它们需要更复杂的控制。数字操作的液压缸可以具有30到40个阀门，而单台机器20或更多的圆柱体可以产生重大的控制要求。

METSO自动化技术工程师Ville Hopponen说：“使用比例的液压系统，很容易设置PID控制器来调整阀门位置。”“数字液压系统需要在控制器中更复杂的数学，并且在开发这样的复杂系统时，编程错误很常见。”

Metso需要一种有效的方法来生产实时原型制度，客户试点实施以及数字液压控制器的生产版本。

METSO工程师使用基于模型的设计为数字液压系统开发控制器，该系统精确地遵循了预定义的滚动位置，滚动速度和NIP压力的目标。

The initial control design was developed in cooperation with Tampere University of Technology’s Department of Intelligent Hydraulics and Automation.

University researchers modeled the control system and the digital valves in Simulink^®。They modeled the calender frame and other aspects of the plant with Simscape Multibody™, and conducted closed-loop simulations in Simulink to verify the feasibility of the design.

Metso engineers enhanced the researchers’ initial model, adapting it for commercial use and adding fault tolerance, diagnostics, and status reporting features. After verifying the enhanced design in Simulink, Metso engineers used Simulink Coder™ to generate C code from their model, which they deployed to dSPACE^®Simulator^®用于实时测试的硬件。

Test results were analyzed in MATLAB^®and used to guide design refinements.

To produce the first customer pilot version, Metso switched from dSPACE to Simulink Real-Time™. During the process, the core Simulink model was unchanged; only input and output modules were updated to accommodate real-time communication with actual hardware.

Following the successful pilot programs, Metso engineers again switched their target, this time to a Beckhoff^®使用C代码的可编程逻辑控制器（PLC）。重复使用了相同的核心控制器模块，对I/O模块进行了微小的更改。METSO工程师现在正在为其他几个数字液压项目使用基于模型的设计。