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RISS 인기검색어
- 검색키워드
- 저자 : D. Rajamani (검색결과 2 건)
- 무료
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ACTIVE DIRECT TILT CONTROL FOR STABILITY ENHANCEMENT OF A NARROW COMMUTER VEHICLE
D.PIYABONGKARN,T.KEVICZKY,R.RAJAMANI 한국자동차공학회 2004 International journal of automotive technology Vol.5 No.2
Narrow commuter vehicles can address many congestion, parking and pollution issues associated with urban transportation. In making narrow vehicles safe, comfortable and acceptable to the public, active tilt control systems are likely to play a crucial role. This paper focuses on the development of an active direct tilt control system for a narrow vehicle that utilizes an actuator in the vehicle suspension. A simple PD controller can stabilize the tilt dynamics of the vehicle to any desired tilt angle. However, the challenges in the tilt control system design arise in determining the desired lean angle in real-time and in minimizing tilt actuator torque requirements. Minimizing torque requirements requires the tilting and turning of the vehicle to be synchronized as closely as possible. This paper explores two different control design approaches to meet these challenges. A Receding Horizon Controller (RHC) is first developed so as to systematically incorporate preview on road curvature and synchronize tilling with driver initiated turning. Second, a nonlinear control system that utilizes feedback linearization is developed and found to be effective in reducing torque. A close analysis of the complex feedback linearization controller provides insight into which terms are important for reducing actuator effort. This is used to reduce controller complexity and obtain a simple nonlinear controller that provides good performance.
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Multi-response optimization of Nd:YAG laser cutting parameters of Ti-6Al-4V superalloy sheet
A. Tamilarasan,D. Rajamani 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
This study proposes a multi-response optimization approach for the Nd: YAG laser cutting parameters of titanium superalloy sheet (Ti-6Al-4V). The Box-Behnken design was utilized to plan the experiments, and response surface methodology was employed to develop experimental models. Four input parameters, including pulse width, pulse energy, cutting speed, and gas pressure, were set during the experiment, and kerf deviation and metal removal rate were considered as the performance characteristics. Pores, dross, and striation lines were observed on the kerf wall of the laser-cut surface through scanning electron microscopy. With the suitable mathematical models established, a search optimization procedure based on the use of desirability function was used to optimize the performance characteristics. A confirmation experiment was also conducted to validate the optimized process parameters. The relative error is less than ±2 %, thus confirming the feasibility and effectiveness of the adopted approach.
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