基于流体单位质量力的飞机燃油测量算法OA

In order to accurately measure the remaining fuel in the aircraft fuel tank,the aircraft fuel quantity measurement algorithm based on fluid unit mass force(AFUMF)is proposed.The unit normal vector of the fuel surface in the aircraft-body coordinate frame can be directly determined using the three-axis accelerometer's output signals as the equivalent of fluid unit mass force.The fuel quantity database can then be created and utilized for the fuel volume calculation by combing the point coordinates obtained from the fuel probes'height signal to determine the directed distance from origin as the fuel surface height.A CATIA secondary development program is developed to evaluate the error distribution of least mean square(LMS)and AFUMF by using the Monte-Carlo analysis method.The result shows AFUMF will alleviate the fuel probes'error and only 1 valid probe is needed,on the contrary,LMS will amplify the fuel probes'error and at least 3 valid probes are required.Using a six-degree-of-freedom platform,a fuel tank test item was constructed to validate AFUMF.The test findings indicate that,under steady conditions,the maximum error is±0.5%full fuel tank quantity.