Browsing by Subject "Machinery"
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Item A program for the development of the Texas autodrome(Texas Tech University, 1989-05) Villarreal, Miguel XavierThe way in which this thesis will be demonstrated is by designing a facility for the development of high - perfomance automobiles. The goal of this facility is to allow a place where the automobile will start as a concept, and be taken to its race ready prototype form. The architecture of this facility will abstract each step of this process, for example the fabrication shop might abstract a piece of machinery or a fabricated component. Although each step will be abstracted, the architecture will represent machine aesthetics and function.Item Dynamic modeling and experimental verification of a flexible-follower quick-return mechanism(Texas Tech University, 1999-05) King, Steven A.In this thesis, the dynamics of flexible multibody systems is studied. In particular, a mathematical model of a flexible-follower quick-return mechanism is generated and verified experimentally. This mechanism is of special interest as the closed-loop constraint manifests itself as a time varying load in the domain of the flexible member. The motivation for modeling this type of system is the current trend in the design of industrial equipment toward lighter weight, more slender mechanism components used in order to achieve higher productivity and lower operating cost. As a result, the usual rigid body assumptions made in the dynamic analysis of these systems are no longer valid. Flexibility of the machine elements must be considered in order to produce useful system models. System equations of motion are generated using a hybrid parameter multiplebody system modeling technique. The methodology allows rigorous formulations of the complete nonlinear, hybrid diflferential equations with boundary conditions, no Lagrange multipliers are needed. To verify the model, an experimental mechanism was constructed and data was collected for several test runs with variations of the system parameters.Item Investigation of single machine scheduling with scheduled preventive maintenance(Texas Tech University, 1997-05) Yang, Tai-Fu TimothyBecause preventive maintenance is one of the most important routine activities in all factories, includmg scheduled preventive maintenance in job scheduling research is quite practical and usefiil. This research mvestigates single machine job scheduling with scheduled preventive maintenance. These problems can be categorized into two classes — fixed maintenance schedule and flexible maintenance schedule. For the fixed maintenance schedule problems, the makespan, total flowtime, and weighted total flowtime are investigated with single or double maintenance requirements. A flexible maintenance schedule has the mamtenance starting time flexible within a time window. The flexible maintenance schedule problems deal with the similar cases to fixed maintenance schedule problems except a general cost fimction is considered for each of the problems. For each problem, a dynamic progranmung (DP) algorithm is developed to obtain the optimal solution. In addition to the DP algorithms, we developed two heuristic algorithms for each of the double maintenance requirement problems. There are a total of 12 DP algorithms and 12 heuristic algorithms presented in this research. Only one DP algorithm is based upon the 0-1 knapsack problem. The remaining algorithms were either newly developed or modified from previous research. Experiments were conducted to verify the performance of these heuristic algorithms. The experiment results show that the heuristic algorithms perform very well. The maximum differences from the optimal solution in average performance measures is about 1%.Item Modeling, simulation and experimental verification of contact/impact dynamics in flexible articulated structures(Texas Tech University, 1998-05) Hariharesan, SeralaathanRobots are used in diverse applications, ranging from entertainment to manufacturing to space applications. Each application has its own requirements in terms of performance, design and operating environment. Based on these requirements, a designer/researcher will have to design a robot that performs its designated task with maximum possible efficiency. Robots are widely used in manufacturing for machining, assembly line operations, welding, painting, inspection, etc. They are also used in a host of other areas like laboratories to place and remove test tubes in centrifuges and to handle hazardous chemicals. In the nuclear industry, they are used to handle radioactive fuel as well as radioactive waste. Robots are also used in remote or highly contaminated areas to measure radiation or toxic levels. Robots have also found their way into the field of agriculture. An interesting application is their use as a sheepshearing machine, where it is used to shear wool off sheep. There are submersible robotic vehicles used for deep sea exploration. These submersible vehicles are used for mining the ocean floor. Last, but not least, there is the space industry which uses robots in various forms. Robots in space applications usually face environments that are hostile to human survival. Planetary rovers with manipulator arms, satellite maintenance robots, manipulator arms for space manufacturing and construction of space stations and space ships and unmanned exploration vehicles are some of the applications of robots in space.