Abstract. Lifting action of forklift is the most common working condition. In this paper, the structure of the hydraulic lifting system of forklift truck is analyzed in detail and the mathematical model is established. On this basis, the MATLAB simulation model of forklift lifting system is established. The simulation results show that the energy consumption(149706J) and efficiency (49.05%) under the rated load and rated lift height. Through the analysis and research of the energy consumption and efficiency of forklift truck lifting system, it lays a theoretical foundation for the future research of forklift truck energy saving.

In this paper, the structural characteristics of lifting mechanism of LiuGong CPD30 forklift are analyzed. After detailed analysis and calculation, it can satisfy the controllability and observability discriminant matrix. The structural characteristics of the hydraulic lifting system of forklift truck are analyzed and studied, which lays a theoretical foundation for the optimal design of the lifting mechanism of the forklift truck.

In view of the increasing demand for rehabilitation nursing service resulting from aging population, a new type of rehabilitation bed system is put forward. The main components consisting of double rocker support, auxiliary spring support, back lifting and leg bending mechanisms, and drive device to realize automatic walk and obstacle avoidance, are introduced. Based on the simplified structural model of leg bending mechanism, the kinematic equations are established and solved to analyze and evaluate stability and safety of posture transformation. The different position transformations of virtual prototype are described to illuminate its principle. The bed scheme has characteristics of being compact, multiple function and easy adjustment, aiming to help the patients and olds to live on their own and to promote health recovery.

A turbulent simulating device in inner field, which is used to research the process of laser propagation in atmospheric turbulent, could avoid to be disturbed by many casual factors from the atmosphere disturb. For the sake of eliminating uncertainty of the atmosphere disturb, a physical simulation turbulent system using phase plates based on Kolmogorov spectrum is designed to carry out a beam spot scintillation experiment of laser propagation. The physical simulation turbulent system employs two phase plates with micro-fabricated surfaces with the characteristic of Kolmogorov spectrum. The formula of simulated atmospheric coherent length of the optical system is given for the motive of adjusting different turbulent conveniently. With the movement in a cone-shape path optical system, the different coherence length to simulate atmospheric turbulent can continuously be adjusted in a wide range. In the experiment of beam spot scintillation, a He-Ne laser of 632.8 nm wavelength with 3.5 mm beam diameter is adopted as the propagation source, which is expanded to 10mm diameter with the expanded lens. The beam passes through all the optical element of the whole turbulent simulation system in sequence. Finally the beam spot reaches the CCD for picking spot images and the detector of laser energy meter for collecting the power of spot scintillation. When the distance between the phase and field lens is adjusted to a longer simulated coherent length, it is observed that whole spot is fractured due to serious phase aberration. We measured the power of spot in one rotation period of the phase plate. The normalized power amplitude distribution histogram and the normalized logarithm power amplitude distribution histogram of the intensity scintillation data in the experiment are given in the paper. The analysis data shows that the confidence probability of the both of Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx confidence probability is respectively 94.248％and 97.895％. It demonstrates that the intensity scintillation of laser beam spot scintillation of the simulated turbulent obeys the rule of logarithm Gaussian distribution. In the experiment it is also observed that laser beam spot scintillation index is increasing by shorting the distance between a phase plate and a field lens. In the meantime there are the same power spectrums for different simulated atmosphere coherent length.Based on the above-mentioned experimental analysis the paper gives the conclusion that the physical simulation turbulent system is able to generate a hypothetical and rational simulation turbulent environment for laser propagation in an inner field.

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