By a general Lagrange multiplier, an iteration approach is proposed to solve the generalized normalized diode equation, by suitable choice of the initial trial-function, one-step iteration leads to a high accurate solution, which is valid for the whole solution domain. Copyright

This paper is concerned with a study of compression force measured by smart cellular textile composites integrated with fiber Bragg grating (FBG) sensors. The novel design of the cellular textile composite structures integrated with FBG sensors is reported. Unit ceils of a cylindrical composite shell are fabricated from glass and polyester woven fabrics and epoxy, and are used to measure compression loads. When the composite shell unit is under pressure, the axial strain induced in the FBG sensor can be determined by the Bragg wavelength shift obtained fi' om an optic spectrum analysis. A theoretical analysis of the fiber' s axial strain focuses on compression load. The influences of environmental tem-perature, thickness, and effective moduli of the composites, and position and direction of the FBG sensors are discussed. The sensitivity of this device is 0.42nm/N (for the polyester composite) and 0.29nm/N (for the glass composite), and the measurement range is 0-2.1 N (PET) and 0-1.3 N (glass), respectively.

We present a simple analytical model for the forces that determine the strength of the air vortex twist acting on the yarns during air-jet spinning as a function of nozzle pressure, flow rate, jet orifice angle, and diameter of the jet orifice.

A cellular textile composite structure integrated with fiber Bragg grating (FBG) sensors is designed for tangential load distribution measurements. The composite consists of many cylindrical shell cells for which a unit cell is fabricated from polyester and glass woven fabrics and epoxy. FBG sensors are bonded on the surface of the cells. The feasibility of using this cellular composite to measure tangential load distribution is demonstrated by experiments. The strain induced wavelength shift in the FBG sensor has a linear relationship with the tangential force within a definite range. Numerical simulations are created by finite element analysis. The influences of the environmental temperature, thickness, and effective moduli of the composite and the influences of the position and direction of the FBG sensors are discussed. The sensitivities of Ibis device are 0.09nm/N (for PET tension), 0.05nm/N (for PET compression), 0.04nm/N (for glass tension), and 0.03nm/N (for glass compression), and the measurement ranges are 0-

分析了纤维布拉格光栅传感器（FBGS）埋入纺织复合材料中的可行性及有效性，结果表明FBGS埋入复合材料中不影响所测物体的应变场，在一定条件下，FBGS所测得的应变和温度能代表所测物体的应变和温度。