Advanced Materials Research Vol. 819

Abstract: The drop-on-demand (DOD) inkjet printing technology has been widely used in many fields and several types of droplet generators are developed. This paper presents the design, fabrication and tests of a piezoelectric bend mode drop-on-demand inkjet printhead with interchangeable nozzle. A disk-type PZT is actuated to push the liquid out of inkjet printhead by a function generator, and a droplet is formed because of surface tension. The interchangeable nozzle design enables the same printhead to be fitted with nozzles of different orifice size, thus a clogged nozzle can be easily removed for cleaning or replacement. An experimental platform for micro-droplet jetting is built in this paper. The droplet formation is recorded by a CCD camera as pictures, which can be used to measure the droplet dimension. The experiments are carried out by using the self-developed bend mode piezoelectric inkjet printing system. The influence of the drive parameters on the droplet quality is also studied by dispensing water.

Abstract: Nowadays, drop-ondemand inkjet printing technology has shown its potential in many fields. This paper presents designing and implementing of a low cost drop-ondemand inkjet printing system. Inkjet printing system can be divided into four parts, and back pressure control system and droplet observation system are two key components, both of which are described in details. In order to have a further control of accuracy and stability of the system, this paper discusses the parameters designed in the system. In pressure control system, the designed system has higher accuracy compared with the Microfabs product. Images can be taken through CCD camera instead of ultra-high-speed camera by using droplet observation system. Some experiments also have been done to verify the feasibility of the device. Accuracy of pressure control, stability of the system and reproducibility of inkjet process can be verified from the experiment.

Abstract: As the demand for high speed and high precision machining increases, the fast and accurate real-time interpolation is necessary in modern computerized numerical control (CNC) systems. However, the complexity of the interpolation algorithm is an obstacle for the embedded processor to achieve high performance control. In this paper, a novel interpolation processor is designed to accelerate the real-time interpolation algorithm. The processor features an advanced parallel architecture, including a 3-stage instruction pipeline, very long instruction word (VLIW) support, and asynchronous instruction execution mechanism. The architecture is aimed for accelerating the computing-intensive tasks in CNC systems. A prototype platform was built using a low-cost field programmable gate array (FPGA) chip to implementation the processor. Experimental result has verified the design and showed the good computing performance of the proposed architecture.

Abstract: Buoy is widely applied in oceanographic research, ocean engineering and so on. The high cable tension and location derivation of its anchor can greatly affected the working condition of buoy. Multi-body software ADAMS is used to analyze the dynamics of deployment for buoy. Firstly, model of mooring buoy is developed. The forces on components of buoy are given such as drag forces, inertia force and impact force between bottom and anchor. The program is developed by macro commands in ADAMS environment. The trajectory and tension force of different nodes on buoy are calculated. This method can simulate the dynamics of deployment process for buoy system. And it is also helpful for guidance for buoy design and deployment process planning.

Abstract: Machine operating panel is an important component of controlling machine and the human-computer interaction. As CAN bus has the remote and stable transmission characteristic, the remote IO board is designed. A design of machine operating panel based on CAN bus for the PC-based CNC system is introduced, including the overall architecture design and software design method. This paper focuses on the remote IO board, as well as the practical application in the CNC system of TDNC-H8.

Abstract: Concurrent engineering claims all influence factors within product lifecycle should be took into account during the stage of product design. After analyzing the relationship between concurrent engineering and virtual prototyping, the human-machine system simulation process and method based on virtual prototyping technology were discussed and illustrated with bicycle design, and the product design method based on virtual prototyping was proposed in this paper.

Abstract: The discharge of RF hollow cathode far zone plasma has advantages of high ion concentration, easy to implement the processing of a large area, given more and more attention. The characteristics of hollow cathode plasma flow have a great relationship with the hollow cathode nozzle structure. How to design the hollow cathode nozzle discharge structure accurately and conveniently is the key problem of the hollow cathode far plasma surface treatment. This article builds a hollow cathode plasma discharge self-consistent model; derive the relationship between the discharge current of the hollow cathode plasma and the hollow cathode nozzle structure. Optimize the design of the hollow cathode discharge structure using discharge particle simulation software, to achieve a fast and accurate design and the purpose of efficient plasma surface modification.

Abstract: Using APDL language, the car sub-frame finite element parametric model is created. It indicates that the emergency braking is the dangerous conditions of sub-frame. The sub-frame is topology optimized under the emergency braking, and gets the element pseudo density distribution map; By modifying the model according to the pseudo-density, the optimization results meet the design requirements. Compared to the original model, it gets a 9.05% reduction in volume, and achieves lightweight of the sub-frame.

Abstract: in order to guarantee the reliability of the hard disk drive data read/write and slider positioning accuracy, the suspension first order bending frequency, first order torsional frequency, first order sway frequency single objective topology optimization model which were based on solid isotropic elastic material penalty (SIMP) method were put forward, and the suspension multi-objective topology optimization model was defined by using the weighted method. Through the topology optimization design the hard disk drive suspension new topological structure was obtained. The results show that hard disk drive suspension single objective and multi-objective topology optimization design objective frequency are large promote than that of the initial design.

Abstract: Scissor lifting mechanisms are widely equipped on airport ground support facilities, in this paper, we propose a unified modeling process for two special SLMs by establishing the expression of input motion vectors and input force vectors and test the results by three proposed cases. A characteristic triangle and corresponding parameters are introduced for any configuration. The presented method provides a reference mode for studying scissor lifting mechanism.