基于功率键合图的挤压机液压系统能耗特性建模及优化分析

Based on Power Bond Graph of Extrusion Machine of Hydraulic System of Energy Consumption Feature Modeling and Optimized Analysis

分析了铝型材挤压机的能耗特性,明确了变量泵容积调速挤压机生产过程中的基本能量流。基于功率键合图对液压系统的能耗特性进行建模,然后推导出状态方程,采用Simulink仿真软件对其动态特性进行仿真。将仿真结果与采集到的实验数据进行对比,从而验证了模型的可靠性。仿真分析了挤压机液压系统的能耗分布特性以及工艺参数对能耗的影响。结果表明:造成变量泵容积调速挤压机效率不高的主要原因是溢流能耗损失,次要原因是变量泵效率低,可通过降低或取消泄压阀的溢流损耗或者采用其它的变流量传动方式来实现挤压机液压系统的节能降耗。在保证铝型材品质的前提下提高挤压速度,有利于降低能耗和生产成本。

By analyzing the energy consumption feature of aluminum profile extrusion machine,the basic energy flow of the Variable Displacement Pump Volume Speed Regulating Extruder is defined in the production process. Based on power bond graph,the energy consumption features of the hydraulic system were modeled,and then the state equation was derived,and the dynamic characteristics were simulated by Simulink simulation software. The simulation results were compared with the experimental data collected in order to verify the reliability of the model. The energy distribution characteristics of the hydraulic system and the influence of process parameters on the energy consumption of the hydraulic system were analyzed by simulation. The results show that,the main reason for the low efficiency of Variable Displacement Pump Volume Speed Regulating Extruder is the overflow energy loss,and second reason is that the variable pump efficiency is low. The overflow loss of the relief valve could be reduced or cancelled or other variable flow transmission method was adopted to realize the extrusion machine of hydraulic system of energy saving. Increase the extrusion speed under the premise of ensuring the quality of aluminum profile,is conducive to reducing energy consumption and production costs.