A new type of holonomic omnidirectionul vehicle which consists of wheel mechanisms without free rollers but with conventional tires is presented. We first present a concept of the new driving wheel mechanism with a tire in the conventional style such QS a rubber tire or a pneumatic tire,"Offset Steered Driving Wheel". The configuration of the wheel has an offset distance between a wheel axle an...

.\ hardness tester, especially adapted for grain, was cor~structecl by modifying a commercial portable soft metal tester known as the Barcol Impressor. h preloaded stylus is forced into grain sections preparetl by rneans ot a microtome. The displacement of the stylus, nleasured by a dial micrometer, is used as a hardness index. This has been related to tlie l'ickers tlianlontl pyramid hardness ...

We postulate that multi-wheel statically-stable mobile robots for operation in human environments are an evolutionary dead end. Robots of this class tall enough to interact meaningfully with people must have low centers of gravity, overly wide bases of support, and very low accelerations to avoid tipping over. Accordingly, we are developing an inverse of this type of mobile robot that is the he...

In present paper, the relationship between fatigue and wear of three kinds pearlite wheel steel samples is investigated by using rolling tester under 0.2% slip ratio condition. The results show that weight loss, surface hardness thickness plastic deformation layer are increased as increase cycles during process. loss G1 sample highest owing to existence a large amount proeutectoid ferrite (PF)g...

Hard coatings have been adopted in cutting and forming applications for nearly two decades. The major purpose of using hard coatings is to reduce the friction coefficient between contact surfaces, to increase strength, toughness and anti-wear performance of working tools and molds, and then to obtain a smooth work surface and an increase in service life of tools and molds. In this report, we de...

Single screw compressors (SSCs) have been used in many fields. Compared with other kinds of compressors, the SSC should have many advantages due to its symmetrical structure and well balanced radial gas pressure on the screw rotor. However, its durability is not as good as expected. After operating for several thousand hours, its flow rate often decreases sharply. The essential reason is that t...

Bodhe, Shraddha G. M.S.E.C.E., Purdue University, August 2014. A lightweight N-cover algorithm for diagnostic fail data minimization. Major Professor: Irith Pomeranz. The increasing design complexity of modern ICs has made it extremely difficult and expensive to test them comprehensively. As the transistor count and density of circuits increase, a large volume of fail data is collected by the t...