航空重力仪是一款对地球重力进行测量的精密仪器, 为了使重力仪在工作状态下隔离飞机飞行过程中的各种扰动, 始终保持竖直稳定状态, 设计了一款高精度航空重力仪惯性稳定平台。同时为了缩短稳定平台设计周期, 并保证所设计的稳定平台系统结构方面的性能能够满足设计指标的要求, 对所设计的高精度航空重力仪惯性稳定平台进行机电联合建模仿真, 建立了基于Adams和Simulink的机电联合仿真模型, 对机电联合仿真模型进行了时域和频域仿真分析, 得到稳定平台时域与频域的基本性能指标, 并把仿真结果和实际测试结果进行了对比。结果表明: 在开环的条件下, 时域与频域仿真结果和实际测试结果基本一致, 俯仰轴幅频匹配度在83%, 相频匹配度在79.2%, 横滚轴幅频匹配度在92.9%, 相频匹配度在86.1%, 2个轴的时域匹配基本类似, 验证了仿真模型的正确性和有效性。该模型可对稳定平台的伺服性能进行预测, 为平台的实际测试与调试打下基础。

Aviation gravimeter is a precision instrument for measuring gravity of the earth. In order to make the gravimeter isolate all kinds of disturbances of flight process in working state, and always keep an upright and stable state, inertial stable platform of aviation gravimeter with high accuracy is designed. At the same time, in order to shorten design cycle of stable platform and ensure performance of designed platform to meet technical requirements, mechatronic joint modeling and simulation are carried out on high accuracy inertial stable platform of aviation gravimeter. Mechatronic joint model based on Adams and SimuLink is built and time domain and frequency domain characteristics are simulated and analyzed. Simulation results and experimental results are compared. Results show that simulation results of time domain and frequency domain approximately agree with experimental results under conditions of open loop, elevation axis amplitude-frequency matching degree is greater than 83% and phase-frequency matching degree is greater than 79.2%; roll axis amplitude-frequency matching degree is greater than 92.9% and phase-frequency matching degree is greater than 86.1%. Time domain matching of two axes is similar, and correctness and validity of simulation model are verified. This model can predict servo performance of stable platform and lay foundation for actual test and debugging of platform.