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A platform inertial platform system (IPS) is a kind of independent navigation system that can give the real-time position, velocity and course information of its carrier. For the IPS based on mechanical gyros, a method of ground vehicle navigation is proposed, in which the IMU of the IPS is stabilized within inertial space. The method can be used for testing the performance of the IPS of high precision...
Improving accuracy is one of the most important research topics in many advanced industrial applications, such as microscopy, biomedical science and semiconductor lithography. On the one hand, to improve the accuracy requires improvement on the system precision, on the other hand, it requires improvement on the system vibration isolation capability. At present, active vibration isolation system composed...
Wire bonding is the most widely used interconnection technology in microelectronics. Aggressive technology scaling has led to device miniaturization resulting in a need for ultra-fine pitch bonding. A deep understanding of the bond formation process will help improve wire bond process reliability and product yield. This paper reports on the study of ball bond (1st bond on the chip) formation process...
Cu wire bonding is one of the hottest trends in electronic packaging due to the cost and the electrical and thermal performance advantages of Cu wire over Au wire. However, there are many challenges to Cu wire bonding, one of which is the increased stress transmitted to the bond pad during ball bonding process. This high stress is not desirable as it leads to pad damage or cratering in the silicon...
Ball bonding processes are optimized on Al pads with a 25.4 ??m diameter Cu wire to obtain maximum average shear strengths of at least 120 MPa. To quantify the direct effect of bond force and ultrasound on the pad stress, ball bonding is performed on test pads with piezoresistive microsensors integrated next to the pad and the real-time ultrasonic signals are measured. By using a lower value of bond...
Large transient electro-dynamic force is generated by high pulse current in electromagnetic rail-launcher, which pushes the armature sliding along the rail until it reaches high muzzle velocity. To realize the target velocity, the armature-rail should contact tightly under appropriate pressure, which is also aroused by electro-dynamic force. The contact pressure varies according with the variety of...
Typical tasks in construction engineering which can be performed by robots include the spraying or cleaning of surfaces. Both applications require that the external force at the end of the manipulator be properly controlled. In this paper, the force control problem in spraying is analyzed. The paper shows that an unknown jet force causes the end-effector to diverge from its desired trajectory. The...
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