Browsing by Author "Zhong, Y"

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    item: Conference-Full-text
    Conceptual framework of decision support model for the selection of structural frame material to achieve sustainability and constructability in singapore
    (2012-06) Zhong, Y; Teo, EAL; Ling, FYY; Ofori, G; Senaratne, S; Sandanayake, YG
    The construction industry plays a significant role not only in economic growth, but also in environmental impacts. As the global recognition on sustainable development, the construction industry is now highly challenged from high material consumption, energy consumption, CO2 emission, and social problems. In addition, Singapore government has launched buildability appraisal system and productivity enhancement scheme to encourage construction industry improve productivity. Under the pressure of reducing environmental impacts and increasing productivity, economic goal is not the only factor that should be considered when doing decision making. There is a clear need for a link between economic performance, environmental performance and productivity performance. Sustainability philosophy and constructability philosophy are useful when establishing such a link. However, little has been done on the connection between constructability principles and sustainable development. This paper presents a holistic framework to show the factors that affect the decision making on selecting structural materials. Based on the framework, a decision support model is established using Multiattribute value technique. The weights of 1st level factors and 2nd level attributes have been computed using AHP method and 1-5 likert scale method. The rating method is offered as well.
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    item: Article-Full-text
    Effect of post-annealing on microstructure and piezoelectric properties of ZnO thin film for triangular shaped vibration energy harvester
    (Elsevier, 2019) Zhang, X; Wang, P; Liu, X; Zhang, W; Zhong, Y; Zhao, H; Shi, S; Jin, S; Amarasinghe, YWR
    In this paper, a triangular shaped piezoelectric vibration energy harvester (TS-PVEH) with zinc oxide (ZnO) thin films as the piezoelectric layer is reported. The effect of post-annealing temperature on the microstructure and piezoelectric performance of ZnO thin film deposited by magnetron sputtering method is investigated firstly. The results show that the optimum post-annealing temperature of 150 °C was the most beneficial to improve the piezoelectric properties of ZnO thin films. Four prototypes of TS-PVEH with different structure parameters are fabricated and optimized. The simulation and experiment results indicate that the height and width of the triangular structure have a significant influence on the vibration mode and the output performance of TS-PVEHs. The optimization results indicate that the third prototype has the best output performance. Its open-circuit voltage and short-circuit current are 290 mV and 1.25 μA, respectively, when the vibration acceleration is 5 m/s2 and the frequency is 56 Hz. Moreover, it has the highest load power density of 0.035 μW/cm2 when the load is 0.1MΩ.
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    item: Article-Full-text
    A piezoelectric power generator based on axisymmetrically distributed PVDF array for two-dimension vibration energy harvesting and direction sensing
    (Elsevier, 2021) Wei, X; Liu, X; Zheng, C; Zhao, H; Zhong, Y; Amarasinghe, YWR; Wang, P
    To achieve vibration energy collection in multiple directions, this paper reports a piezoelectric power generator with an axisymmetrically distributed PVDF array, which is used to acquire 2D vibration energy and monitor the vibration direction. The simulations and the experiments demonstrated that the flexible cylinder with an arcshaped axisymmetrically distributed PVDF array, can harvest vibration energy form multiple directions. Meanwhile, the concept of angular bandwidth is proposed, which can describe the multi-directional vibration energy capability of the harvester. Experiments show that the design has a large AB value (89.2◦). Furthermore, increase the output performance of the harvest by reverse series and parallel connection. Finally, a detailed study and summary of the output characteristics of all PVDFs in PVEH confirm that PVEH has potential as a vibration direction sensor. The PVEH can monitor the vibration direction of 8 areas in real-time.