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2.5D IC is an important transition product of 3D IC in the next generation. It has very important commercial value. However, at present 2.5D IC package process has numerous issues that need to be overcome, especially for interface delamination caused by warpage under reflow temperature. Conventionally, the material adopted for the passivation (PA) layer in 2.5D IC package is inorganic metal glass...
This paper presents one strategy for modeling and optimization of a microdilling process. Experimental work has been carried out for measuring the thrust force for five different commonly used alloys, under several cutting conditions. An artificial neural network-based model was implemented for modelling the thrust force. Neural model showed a high goodness of fit and appropriate generalization capability...
In this paper, a force/vision control strategy is proposed for the robotic cutting of soft materials. The separation is performed by repeating a series of cuts, called passages, along a deformable three dimensional curve. An image based visual servoing system is proposed to control all six degrees of freedom of the cutting tool. This allows the system to change the cutting depth and angle in response...
The Magneto Rheological Fluid, MRF is a reversible material, this material would be an idea semi-active control device due to its reversible and easy-control properties. In this research, Solid Works 3D drawing software is used as the structural design and Max Well magnetic field analysis software is used to simulate the lines of magnetic force toward the innovation design "semi-active spiral...
Nowadays, there is a widespread demand for applying the robot system into the various fields. Especially, robot can substitute human and perform the dangerous activity such as search and rescue in the battle field or disaster. We are developing the dual arm robot which can be adapted to the rescue robot with tracked mobile platform. Therefore, it has to be designed to have the protection mechanism...
This document details the design, implementation and analysis of a clamped-clamped capacitively-coupled beam resonator with a high Q-factor [>10000] in the VHF band [30-300MHz]. The document also draws a parallel between simulation results and theoretical results of key performance metrics of the design.
A flexible fiber conditioner was developed as a surface reference conditioning tool in CMP (Chemical Mechanical Planarization) process. The conditioner keeps contact force of each fiber edge constant to the pad by making use of fiber bending effect. In this paper, the running test was evaluated using the flexible fiber conditioner. The result indicated that the fiber conditioner achieved long life...
The paper that is based on the mesoscopic damage evolution of metal explores the mechanism of Kaiser effect. Unidirectional and multidirectional tensile experiments of Q345 material were conducted to reveal the relationship between the internal damage evolution of mesoscopic holes and Kaiser effect. The results show that the forcewill cause the damage corresponding to the direction of force. When...
Need for the robot-manipulator on the mobile robot is increasing. If the mobile manipulator is used in the on-road environment, the design concept of the manipulator is not different. But if it is designed for an off-road environment, it has to be designed to get over the vibrational forces induced by the off-road traveling. For the mobile platform, the design concept and process have been developed...
The need for mechatronic devices that are lightweight, less cumbersome and able to produce small, quick and precise movements or forces is ever increasing in many fields of engineering. Many recent design solutions are based on electrically, magnetically or thermally activated materials, often referred to as smart materials. This tutorial paper overviews the main properties and the resulting applications...
This paper presents the modeling of thrust force in microdrilling processes of five commonly used alloys (titanium-based, tungsten-based, aluminum-based and invar). The process was carried out by peck drilling and the influence of five parameters (drill diameter, cutting speed, feed rate, one-step feed length and total drilling length) on the behavior of the thrust force was considered. A fuzzy system...
This paper experimentally explores thin film micro-contact pairs of Au-Au, Au-Ru and Au-RuO2 through the utilization of thin-film contact resistance and spreading resistance theory. Contacts of various combinations of material pairs, including evaporated Au lower planar contact and sputtered Au, Ru or Au-RuO2 upper hemispherical contact were fabricated and their performance monitored through many...
In earlier work it was recommended that accelerated tests, using elevated currents, be used to evaluate the performance of contact designs using materials that may be susceptible to electro-migration. This is necessary since it was found in earlier work that the type of self-diffusion in some cases had a major impact on time to failure. Since the type of diffusion is generally not known in advance,...
Engineering statics is a gateway course in engineering education that prepares students for subsequent courses such as dynamics and mechanics of materials. However, students may not explicitly voice their concerns or challenges encountered when trying to understand the material due to their unfamiliarity with engineering concepts in statics. Therefore, it is important to explore different venues that...
Inquiry-based learning activities (IBLAs) consist of presenting teams of students with a physical situation and asking them to predict what will happen. The students collaboratively experiment with physical hardware that becomes the "authority", thus forcing students to confront any misconceptions. Several variations of the activity are presented, requiring students to examine and reformulate...
Knowledge of the contact resistance-contact force characteristics is essential for the design and diagnostics of electrical contacts, especially for low pressure contacts in connectors. Since the electrical contacts often have to be mated after a long period of storage, not only the characteristics of virgin contact surfaces but also those of aged contact surfaces are of substantial importance. The...
A model is developed to determine the peak current required to weld large area closed contacts with ‘n’ points of contact when passing short duration, high fault currents. The model also predicts the threshold welding current for parallel contact structures used to carry large currents in high current switching devices. The model considers: (1) the total contact resistance of the closed contacts by...
In this paper, a force/vision control strategy is proposed in order to separate soft deformable materials using cooperative robots. The separation is performed by repeating a series of cuts, called passages, along a curved trajectory. The vision control is used to locally update the robot trajectory in response to both on-line deformations and off-line modeling errors. The force controller is used...
This paper details the design and characterization of a biomimetic flapping actuator inspired by fin-rays of fishes. The flapper design consists of two carbon fiber beams with a thin viscoelastic material sandwiched between them. When the beams are actuated to move relative to each other tangentially, the entire assembly curves out of the plane of symmetry creating a flapping motion. A model for the...
ON-OFF adhesives can benefit manufacturing and space applications by providing the capability to selectively anchor two surfaces together repeatedly and releasably without significant preload. Two key areas of concern are speed of engagement and sensing the quality of that engagement. Here we describe a dual-purpose proximity and tactile sensor for the contact surfaces of robotic systems. Using infrared...
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