This paper conducts the front wheel angle tracking compensation control of the electro-hydraulic coupling power steering system (EHCPS) of the intelligent heavy vehicle (IHV). It has been found from the results of mathematic analysis, simulation and open-loop frequency test of the EHCPS that front wheel angle slightly lags behind handwheel angle at low frequencies. In this paper, a kind of fuzzy neural network controller (FNNC) based on model reference adaptive control (MRAC) is designed. Fuzzy neural network is also used to identify the EHCPS on-line. Membership function and inference rules of the FNNC and fuzzy neural network identification (FNNI) are renewed by the self-learning function of neural network to achieve on-line regulation of controller’s parameters. Reference model with certain bandwidth and control algorithm are designed to ensure that actual front wheel angle follows desired front wheel angle. Finally, the hardware-in-the-loop experiment and simulation results indicate that the control strategy presented in this paper is effective in compensating front wheel angle tracking within certain bandwidth of EHCPS.

With the extensive application of optical parts in many high-tech fields such as high-power laser, space optics, and aerospace, the requirements for the surface quality of optical parts are also increasing, which requires not only high surface qualities but also low defects including low subsurface damage and strict wavefront errors. As an essential link in the precision and ultraprecision optical manufacturing, various surface polishing methods and techniques have always attracted researchers’ continuous study and exploration. Considering the development of optical part surface polishing technology in recent years, this study analyzes the principle and development process of typical processing methods represented by each kind of polishing technology, expounds the specific research progress of optical part surface polishing technology, including the iterative renewal of traditional technologies and the research development of new technologies, and gives examples for typical applications. Finally, the development trend of optical part surface polishing technology is prospected, which provides a reference for follow-up intensive research in optical manufacturing.