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The most significant issues in printable electronics fabrication are the printing quality and efficiency delivered by drop-on-demand (DOD) industrial inkjet printhead. Aiming to characterize the nonlinear behaviors of piezoelectric inkjet printhead, the dynamic lumped element model (DLEM) is proposed to cast the original LEM into a time-varying and nonlinear fashion. At the same time , the PSO-based optimization for paramenters is incorporated in DLEM. Due to new characteristics, DLEM can accurately simulate the inkjet-printed nanosilver droplet formation process and effectively predicate optimal combinations of high-frequency driving waveform with high printing quality. From extensive experimental studies, the effectiveness and efficiency of the proposed DLEM is validated.

Wave energy is recognized as an important pollution-free source of power generation in the world. So in last decades wide variety of wave energy converters (WEC) has been developed, meanwhile, more economical and reliable technologies were also under process. It is very vital to decide about the location of the WECs in a wave farm, which can increase the electricity generation [1]. To get the optimum power output, it is necessary to evaluate the layout of WECs by computer simulations, such as SWAN, MIKE21, SWASH, etc [2]. Among them, MIKE21 is a professional modeling and simulation engineering software, and is well known as a tool that provides a design environment for engineering, coastal management and planning applications. So, in this paper, MIKE21 BW was introduced briefly and applied to simulate and calculate the wave parameters of the Chengshantou wave farm, then, the layout of a new-type (Water-filled raft) WECs in the Chengshantou wave farm which can generate higher possible power output was investigated and the optimum scheme was achieved finally.

Installation of inter-phase spacer can effectively protects against line fault caused by conductor galloping, non-synchronous swing and sleet jump etc large amplitude vibration, but sag of the conductor is changed if inter-phase spacer is installed. And installation of initial inter-phase spacer will cause change of inter-phase distance, which cause difficulty of successive installation. The empirical equation can’t accurately analyze change of the inter-phase distance caused during installation of the inter-phase spacer. In this paper, accurate conductor installation inter-phase spacer analysis model is established with non-linear finite element method. Change of the conductor sag after installation of the inter-phase spacer is calculated, and influence on inter-phase distance caused by different installation sequence is analyzed. The research result provides effective analysis method for length control of actual line installed inter-phase spacers, and ensures manufacturing and successful installation of the inter-phase spacer.

The paper discusses the structural stability of 4-dof manipulator, which is suitable for welding spot of three-dimensional space concentrated distribution and approximate single-axis distribution in car body. By using the UG/CAE module, static analysis is applied to the main structure of the manipulator, and the results show that the whole structure meets the design requirement of stiffness and strength.