Research on Airworthiness-based Control Mode for Aircraft Windshield Heating System

Abstract

According to civil aircraft airworthiness standards, the windshield surface should avoid icing or fogging to ensure the pilots visual field. A reasonable heating power should be determined to keep the temperature of windshield. A summarization is made about the critical parameter of windshield heating system design, including heating method, thermal load calculation and control regulation. Based on the related aircraft, the heat transfer processes simulation of windshield is predicted and characteristics of two different heating modes are analyzed by making use of LMS.AMESim. The results demonstrate that the full heating power mode could make a high heating rate and then the windshield will remain a higher temperature, which is good for performance of anti-ice and defogging. Duty ratio heating mode could greatly reduce the thermal shock to windshield, but it also will produce significant impact on upstream equipment because of frequent change of heating power.

Keywords

• airworthiness
• windshield heating
• transient heat transfer
• design requirement