电动叉车作为工业搬运车辆中的典型代表,普遍运用在沿海港口、大型车站、生产车间、仓库以及物流中心等地点,电动叉车与其他普通车辆不同,一是自身质量大,二是工作时负载变化十分频繁,多驱动叉车也随之产生.在转向过程中,若车速过高,由于侧向力的作用容易发生侧翻或侧滑事故;若车速过低,则会延长搬运时间,不利于输送的经济性.在操作空间比较狭小,需要频繁转向搬运货物的工作环境下,电动叉车经常发生安全事故.因此必须确保电动叉车运行时整车横摆与侧偏的平稳性,这是电动叉车电驱动和转向系统控制的关键问题之一.
A new phase unwrapping method based on dual-frequency fringe is proposed to improve both high accuracy and large measurement range of three-dimensional shape measurement by synthesizing the projected dual-frequency fringes obtaining higher and lower frequ
In this paper,we demonstrate a scheme to tailor both longitudinal and transverse modes inside a laser cavity and constitute an eye-safe single longitudinal mode Er ∶Y3Al5O12[Er∶YAG]vector laser.A q-plate is employed as a spin-orbital conversion element to
Photonic nanojets[PNJs]are subwavelength jet-like propagating waves generated by illuminating a dielectric microstruc-ture with an electromagnetic wave,conventionally a linearly polarized plane wave.Here,we study the donut-like PNJ produced when a circula
Two-dimensional[2D]perovskites exhibit broadband emission due to strong exciton-phonon coupling-induced self-trapped excitons and thus would find important applications in the field of white-light emitting devices.However,the available identifying methods
In this Letter,we demonstrated the switchable single-and dual-wavelength femtosecond soliton generation in single-mode Er-doped fiber lasers with the usage of carboxyl-functionalized graphene oxide[GO-COOH]saturable absorbers[SAs]for the first time,to the
In this paper,we propose and demonstrate an adjustable-free and movable Nd∶WO4 thin disk laser based on the telecentric cat\'s eye cavity.We design a V-shaped laser cavity containing two reflectors with Nd∶WO4 thin disks as the gain medium.The experimen
Laser polarization and its intensity inside a filament core play an important role in filament-based applications.However,polarization dependent clamping intensity inside filaments has been overlooked to interpret the polarization-related iila-mentation p
We present the perfect light absorption of monolayer molybdenum disulfide[MoS2]in a dielectric multilayer system with two different Bragg mirrors.The results show that the strong absorption of visible light in monolayer MoS2 is attributed to the formation
We proposed a periodic mid-infrared broadband chiral structure.Its unit cell consists of four indium tin oxide[ITO]helix subunits with different radii.The simulation results show that the flat-topped broadband circular dichroism[CD]can be achieved in the