利用集成传感器系统及电子设备对智能轻质结构生产过程的优化研究

[Abstract] The cross-industry general development towards working effectively lightweight solutions continues unabatedly and leads to an increasing use of structural components made of fiber composites. At the same time， there is an increasing demand for the realization and integration of additional functions such as sensory properties. For the widespread application of intelligent lightweight components， manufacturing technologies suitable for series production are required. Fibre-reinforced polyurethane that made of different combined parts to offer a great potential for the making of smart lightweight structures. A novel method based on the Long Fibre injecting （LFI） technology fostering the integration of piezoceramic components and by their direct connection to suitable electrode structures the process immanent fabrication of sensory elements.

[Keywords]―fibre composites； light weight； reinforced polyurethane

1.Introduction Fibre-reinforced polyurethane composites renders a high potential for serial production of adaptive lightweight structures. Processing of highly reactive， two-component polyurethane sets in fully massive investment is needed processes enables short cycle times and thus the production of composite components for high-volume applications. In examine to other plastics and composite manufacturing technologies， polyurethane processing methods are characterized by moderate process conditions that favor the integration of additional functional elements like sensors and electronic components.

2.Basic technology Long Fiber Injection various factors in the automotive sector have combined to create a favourable climate for the development of materials and fabrication techniques for polymer-based composite body panels and structures as the case in LFI. [3]. It is specially connivance for high-amount production of large lightweight components， which are applied mainly in automotive industry， modern concepts introduce intelligent parts by integrating sensor networks into the composite. [4-5].

3. Development of the novel Multi Fibre Injection process： For the high-amount making of fibre-reinforced polyurethane combination with combined piezoelectric purpose elements， new multi Fibre Injection spray coat application based on the LFI process is applied. This technology is particularly characterized by the process-prevent generation of integrated piezoelectric functional elements.

3.1General requirements and preliminary studiesFor the generation of a piezoelectricfunctional layer， first suitable piezoceramic components are specified. For thegeneration of a piezoelectric functional layer， first suitable piezoceramiccomponents are spell out. A method for manufacturing a cofired multi-layerpiezoelectric transformer device includes forming first and second greenshapes of a sinterable ceramic composition and applying metallizationlayer there between [7].the sensors have been spoiled mechanically in dynamicthree-point bending and compression tests at a frequency of 1 Hz. The resultingvoltage signals before and after polarization have been quantified. In fig. 4the voltage signal of a piezoelectric sensor with PZT fibres and electrodesmade of tin- bronze is drawn.

Fig.4.electric current （voltage）signalofaprototypicpiezoelectricfunctionalelementduringdynamicthree-point-bending，（a） earlier polarization；（b）afterpolarization

3.3Handlingof electrode structures： The machine automatedhandling， especially gripping and positioning of the specified porous electrodestructures， requires an appropriate handling system. Among different handlingtechnologies， holding by cleaner has been favoured due to its processing flexibilityand gentle handling. In preliminary studies， different vacuum grippers weretested and suitable suction pads have been identified. These holders werespecifically designed for the handling of composites and thin films. Thecomposite holders are operated with pressed air and generate an internalvacuum. Due to a special design utilizing the Coanda effect， gentle handling ofthin- walled structures is given. The chosen suction pads have been tested inextensive studies， using the specified electrode structures. At first， thedistance at which picking of the respective electrodes is possible wasquantified as a function of the applied pressure. Fig. 6 shows the determinedvalues.

fig.6.

determined gripping distance for specified electrodes as a function of applied pressure

ConclusionsThe new Multi Fibre Injectiontechnology acts as a foundation on LFI steps managing a serial making ofintelligent fibre-reinforced polyurethane composites with sensory properties. Piezoceramiccomponents like short fibres in mixture with suitable at the point which anelectric enters or leave the structuresare suitable for generating piezoelectric functional elements. With developedof MFI process unit， process-immanentand to make a process in a factory production integration of such elements is possible. By this， the previouslyseparate production process applying a device which is used to record thepresence of changes or even detects and component fabrication are combined in asingle-stage efficient process. Next research work focus on the development ofchanged methods for contacting and polarization.AcknowledgementsThis research is supported by theSchool of Architecture， Southeast University with Collaboration of college ofinternational students in this ResearchReferences[1]Garrett， Thomas Kenneth， Kenneth Newton， and William Steeds. MotorVehicle. Butterworth-Heinemann， 2000.[2] Garrett， Thomas Kenneth， Kenneth Newton， andWilliam Steeds. Motor Vehicle. Butterworth-Heinemann， 2000. [3] Rudd，Christopher D. Composites for automotive applications. Vol. 126. iSmithersRapra Publishing， 2000.[4] Weder， Andreas， Sirko Geller， AndreasHeinig， Thomas Tyczynski， Werner Hufenbach， and Wolf-Joachim Fischer. "Anovel technology for the high-volume production of intelligent compositestructures with integrated piezoceramic sensors and electroniccomponents." Sensors and Actuators A： Physical 202 （2013）：106-110.[5] Weder， Andreas， Sirko Geller， AndreasHeinig， Thomas Tyczynski， Werner Hufenbach， and Wolf-Joachim Fischer. "Anovel technology for the high-volume production of intelligent compositestructures with integrated piezoceramic sensors and electroniccomponents." Sensors and Actuators A： Physical 202 （2013）：106-110.[6] Frenot， Audrey， and Ioannis S.Chronakis. "Polymer nanofibers assembled byelectrospinning." Current opinion in colloid & interfacescience 8， no. 1 （2003）： 64-75.[7] Bishop， Richard Patten. "Methodof manufacturing a co-fired flextensional piezoelectric transformer." U.S.Patent 6，182，340， issued February 6， 2001.