A novel semi-active suspension design based on decoupling skyhook control

A semi-active suspension design based on the traditional method of skyhook control is not capable of effectively controlling the attitude of the vehicle. However, an innovative approach called decoupling skyhook control allows the attitude of the vehicle body and its vibration characteristics to be effectively controlled. In this paper, a new decoupling skyhook controller for semi-active suspension is presented. Vehicle body motions in the three directions of vertical, pitch, and roll have been adopted to develop three skyhook controllers and directly control the vehicle body attitude. Furthermore, three orientation skyhook control forces are converted into actual damping forces of four adjustable dampers through the input decoupling transformation. The simulation results show that the developed controller is more effective than the traditional skyhook control in improving ride comfort

A novel semi-active suspension design based on decoupling skyhook control

A semi-active suspension design based on the traditional method of skyhook control is not capable of effectively controlling the attitude of the vehicle. However, an innovative approach called decoupling skyhook control allows the attitude of the vehicle body and its vibration characteristics to be effectively controlled. In this paper, a new decoupling skyhook controller for semi-active suspension is presented. Vehicle body motions in the three directions of vertical, pitch, and roll have been adopted to develop three skyhook controllers and directly control the vehicle body attitude. Furthermore, three orientation skyhook control forces are converted into actual damping forces of four adjustable dampers through the input decoupling transformation. The simulation results show that the developed controller is more effective than the traditional skyhook control in improving ride comfort

A novel semi-active suspension design based on decoupling skyhook control

A semi-active suspension design based on the traditional method of skyhook control is not capable of effectively controlling the attitude of the vehicle. However, an innovative approach called decoupling skyhook control allows the attitude of the vehicle body and its vibration characteristics to be effectively controlled. In this paper, a new decoupling skyhook controller for semi-active suspension is presented. Vehicle body motions in the three directions of vertical, pitch, and roll have been adopted to develop three skyhook controllers and directly control the vehicle body attitude. Furthermore, three orientation skyhook control forces are converted into actual damping forces of four adjustable dampers through the input decoupling transformation. The simulation results show that the developed controller is more effective than the traditional skyhook control in improving ride comfort

Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering

Rare-earth engineering is an effective way to introduce and tune the magnetism in topological Kagome magnets, which has been acting as a fertile platform to investigate the quantum interactions between geometry, topology, spin, and correlation. Here we report the structure and properties of three newly discovered Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) with various magnetic states. They crystalize in the orthogonal space group Fmmm (No.69), where slightly distorted Ti Kagome lattice, RE triangular lattice, Bi honeycomb and triangular lattices stack along the a axis. By changing the rare earth atoms on RE zag-zig chains, the magnetism can be tuned from nonmagnetic YbTi3Bi4 to short-range ordered PrTi3Bi4 (Tanomaly ~ 8.2 K), and finally to ferromagnetic NdTi3Bi4 (Tc ~ 8.5 K). The measurements of resistivity and specific heat capacity demonstrate an evolution of electron correlation and density of states near the Fermi level with different rare earth atoms. In-situ resistance measurements of NdTi3Bi4 under high pressure further reveal a potential relationship between the electron correlation and ferromagnetic ordering temperature. These results highlight RETi3Bi4 as another family of topological Kagome magnets to explore nontrivial band topology and exotic phases in Kagome materials.Comment: Manuscript:17 pages, 5 figures; Supporting information:11 pages, 11 tables and 10 figure

Web service discovery based on behavior signatures

Web service discovery is a key problem as the number of services is expected to increase dramatically. Service discovery at the present time is based primarily on keywords, or interfaces of web services through the use of ontology. We argue that “behavior signatures ” as operational level description should play an important role in the service discovery process. In this paper, we propose a new behavior model for web services using automata and logic formalisms. Roughly, the model associates messages with activities and adopts the IOPR model in OWL-S to describe activities. A new query language is developed to express temporal and semantic properties on service behaviors. Query evaluation algorithms are developed; in particular, an optimization approach using RE-tree and heuristics is shown to improve the performance. Specifically, experimental results show that the use of RE-tree reduces query evaluation time by an order of magnitude and with heuristics it enhances the performance by two orders of magnitude. This is clearly an encouraging starting point.

Creating a Demarcation Point between Content Production and Encoding in a Digital Classroom

Incorporating a significant amount of technology into a classroom is an important, but extremely difficult task. In this paper we describe the next generation of the UCSB digital classroom, called the Collaborative Technologies Lab (CTL). The primary goal of the CTL is to investigate the challenges of deploying technology for technology's sake. We feel that without the ability to deploy a large amount of technology and offer robust functionality, the whole idea of enhanced learning environments becomes marginalized. Therefore, it is critical to understand the challenges of deeply embedding technology in a classroom. Based on experience in building and using the CTL, in this paper we propose a demarcation point between program production and content encoding. This demarcation point offers the advantage of breaking a large technical problem into smaller, easier-to-solve problems. The demarcation point also has the advantage of being able to separate complex functions along common lines of expertise. One skilled in production need not worry about the technology of the encoding systems and one skilled in technology need not worry about the ascetics of program productio

The MIDAS System: A Service Oriented Architecture for Automated Supply Chain Management

The MIDAS system that we have developed is an automated supply chain management system based on the Service Oriented Architecture and Web Services. MIDAS provides a loosely-coupled distributed environment that allows customers, manufacturers, and suppliers to cooperate over the Internet and World Wide Web. It aims to reduce inventory carrying costs and logistics administration costs, yielding a more efficient supply chain, by supporting just-in-time manufacturing. It eliminates, or substantially reduces, human intervention on both the customer/manufacturer side and the manufacturer/supplier side. It allows a manufacturer to select, dynamically from the MIDAS Registry, suppliers of components, based on the price, availability, and delivery time of those components. A manufacturer can use one of several strategies to aggregate customers ’ orders before it processes them and to accumulate suppliers ’ quotes before it decides on a particular supplier. The use of a Service Oriented Architecture, such as MIDAS, can substantially improve the efficiency of a supply chain.