系列化液压挖掘机数字样机研究

Hydraulic excavator is a typical multi-actuator engineering equipment, which is characterized with large inertia actuator and single pump driving multi actuators, and its load changes largely. Thus, it is difficult to fully understand the operating characteristics before the design, which leads to low efficiency and poor performance. The digital prototype can effectively improve the efficiency of system design. However, it is difficult to calculate the equivalent quality effect and variable inertia applied on each actuator in real time with the traditional one-dimensional simulation technology, result in lack of precision and distortion of dynamic characteristics and it is difficult to simulate the real system characteristics. Aiming at the above problems, the digital prototype design method based on component test and real physical structure is proposed. With this method, real-time information exchange and collaborative computing between the mechanical structure, electric system, control system and the load can be realized. Firstly, a digital prototype of a 6 t hydraulic excavator is designed and it is modified with detail tests. And then, it is introduced to develop the digital prototype of 20 t, 76 t, 260 t, 390 t excavators. And based on the digital technology, a 76 t high efficiency hydraulic excavator and the first domestic 260 t and 390 t ultra large excavators, are developed.