2008 3rd International Symposium on Communications, Control and Signal Processing, 2008
This paper describes experimental results for a prototype mechanical steering compensator for mot... more This paper describes experimental results for a prototype mechanical steering compensator for motorcycles which was manufactured at Cambridge University Engineering Department (CUED). The compensator realises a mechanical network consisting of inerters, dampers and a spring. The paper extends the previous work of Papageorgiou et al and presents frequency response testing results as well as model fitting and parameter estimation.
International Oil & Gas Conference and Exhibition in China, 2006
Abstract The China National Offshore Oil Corporation (CNOOC), Shell, and ConocoPhillips China, In... more Abstract The China National Offshore Oil Corporation (CNOOC), Shell, and ConocoPhillips China, Inc.,(COPC) are partners in the development of the XJG oil fields in the South China Sea. The XJG fields are in a mature production phase and challenge COPC (the field ...
This paper investigates the possibility of improving the performance of railway vehicle suspensio... more This paper investigates the possibility of improving the performance of railway vehicle suspensions by incorporating a newly developed mechanical device known as the inerter. A comparative study of several low-complexity passive suspension layouts is made. Improved performance for the lateral and vertical ride comfort, as well as lateral body movement when curving are demonstrated in comparison with the conventional suspension layout. The constraints imposed are to maintain the same level of other performance metrics. The calculations and optimisations are based on linearised plan-view and side-view high-speed train mathematical models.
This paper classifies the positive-real biquadratic functions which can be realized by five-eleme... more This paper classifies the positive-real biquadratic functions which can be realized by five-element networks. The concept of regular positive-real functions is introduced to facilitate this classification. Networks are grouped into quartets which may sometimes reduce to two or one network(s). It is shown that a biquadratic can be realized by a series-parallel network with two reactive elements if and only if it is regular. Moreover, there are two such network quartets which can realize all regular biquadratics. It is shown that the only five-element networks which can realize nonregular biquadratics can be arranged into three network quartets. The quartets comprise: 1) two bridge networks with two reactive elements; 2) four series-parallel networks with three reactive elements; and 3) two bridge networks with three reactive elements. The necessary and sufficient realizability conditions are derived for each of these networks. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
The purpose of this paper is to continue to develop the recently introduced concept of a regular ... more The purpose of this paper is to continue to develop the recently introduced concept of a regular positive-real function and its application to the classification of low-complexity two-terminal networks. Previous work showed that seriesparallel five-element networks with two reactive elements are always regular and that there are four quartets of series-parallel networks with three reactive elements and three resistive elements which may realise non-regular biquadratic immittances. In this paper we consider six-element networks with four reactive elements. We describe a classification procedure to find an efficient subset of such networks which may realise any non-regular biquadratic that can be synthesised by this class of networks. We also describes a method to derive the necessary and sufficient realisablity conditions for a given network. This paper builds on previous work of the authors as well as the work of Vasiliu. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
The purpose of this paper is to formalise the concept of a regular positive-real function and to ... more The purpose of this paper is to formalise the concept of a regular positive-real function and to demonstrate its usefulness in the classification of low-complexity two-terminal networks. We will develop a series of lemmas characterising the basic properties of regularity. We will give a simple proof that all five-element series-parallel networks with two reactive elements are regular, and we will show that there are only two bridge-networks with two reactive elements which may be non-regular. We will discuss the class of two-terminal networks with two reactive elements and an arbitrary number of resistive elements and highlight a theorem of Reichert. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
In recent years, our country house prices is empty tall and the share price is up and down, and i... more In recent years, our country house prices is empty tall and the share price is up and down, and it brought a series of adverse impact to economic development.Prime minister wen also "two conferences" in the work report: the current house prices has a far distance from the reasonable price.In this occasion,revealing the inner relationship between to restrain asset price bubbles and promoting the stock market and real estate market's healthy development is very necessary.The international experience shows that real estate prices and stock prices between violent shake is closely and if as soon as the price bubble burst, it will give the overall economy caused serious consequences even cause a recession.This paper, through the macro analysis, comprehensive consideration of the share price change on the influence of the real estate investment, real estate and stock prices reveal the connection between the two, That in certain conditions, due to substitution effect and extrusion effect will more than wealth effect, leading to the stock price and the real estate prices run in opposite directions. On the one hand, China's stock market's not perfect, and lead to wealth effect the weak; On the other hand, lack of investment channels to strengthen the stock and real estate of substitution between effect. To this, this paper analyzes the causes and the real estate investment. At last puts forward some policy Suggestions.
2008 3rd International Symposium on Communications, Control and Signal Processing, 2008
This paper describes experimental results for a prototype mechanical steering compensator for mot... more This paper describes experimental results for a prototype mechanical steering compensator for motorcycles which was manufactured at Cambridge University Engineering Department (CUED). The compensator realises a mechanical network consisting of inerters, dampers and a spring. The paper extends the previous work of Papageorgiou et al and presents frequency response testing results as well as model fitting and parameter estimation.
International Oil & Gas Conference and Exhibition in China, 2006
Abstract The China National Offshore Oil Corporation (CNOOC), Shell, and ConocoPhillips China, In... more Abstract The China National Offshore Oil Corporation (CNOOC), Shell, and ConocoPhillips China, Inc.,(COPC) are partners in the development of the XJG oil fields in the South China Sea. The XJG fields are in a mature production phase and challenge COPC (the field ...
This paper investigates the possibility of improving the performance of railway vehicle suspensio... more This paper investigates the possibility of improving the performance of railway vehicle suspensions by incorporating a newly developed mechanical device known as the inerter. A comparative study of several low-complexity passive suspension layouts is made. Improved performance for the lateral and vertical ride comfort, as well as lateral body movement when curving are demonstrated in comparison with the conventional suspension layout. The constraints imposed are to maintain the same level of other performance metrics. The calculations and optimisations are based on linearised plan-view and side-view high-speed train mathematical models.
This paper classifies the positive-real biquadratic functions which can be realized by five-eleme... more This paper classifies the positive-real biquadratic functions which can be realized by five-element networks. The concept of regular positive-real functions is introduced to facilitate this classification. Networks are grouped into quartets which may sometimes reduce to two or one network(s). It is shown that a biquadratic can be realized by a series-parallel network with two reactive elements if and only if it is regular. Moreover, there are two such network quartets which can realize all regular biquadratics. It is shown that the only five-element networks which can realize nonregular biquadratics can be arranged into three network quartets. The quartets comprise: 1) two bridge networks with two reactive elements; 2) four series-parallel networks with three reactive elements; and 3) two bridge networks with three reactive elements. The necessary and sufficient realizability conditions are derived for each of these networks. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
The purpose of this paper is to continue to develop the recently introduced concept of a regular ... more The purpose of this paper is to continue to develop the recently introduced concept of a regular positive-real function and its application to the classification of low-complexity two-terminal networks. Previous work showed that seriesparallel five-element networks with two reactive elements are always regular and that there are four quartets of series-parallel networks with three reactive elements and three resistive elements which may realise non-regular biquadratic immittances. In this paper we consider six-element networks with four reactive elements. We describe a classification procedure to find an efficient subset of such networks which may realise any non-regular biquadratic that can be synthesised by this class of networks. We also describes a method to derive the necessary and sufficient realisablity conditions for a given network. This paper builds on previous work of the authors as well as the work of Vasiliu. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
The purpose of this paper is to formalise the concept of a regular positive-real function and to ... more The purpose of this paper is to formalise the concept of a regular positive-real function and to demonstrate its usefulness in the classification of low-complexity two-terminal networks. We will develop a series of lemmas characterising the basic properties of regularity. We will give a simple proof that all five-element series-parallel networks with two reactive elements are regular, and we will show that there are only two bridge-networks with two reactive elements which may be non-regular. We will discuss the class of two-terminal networks with two reactive elements and an arbitrary number of resistive elements and highlight a theorem of Reichert. The results are motivated by an approach to passive mechanical control which makes use of the inerter device.
In recent years, our country house prices is empty tall and the share price is up and down, and i... more In recent years, our country house prices is empty tall and the share price is up and down, and it brought a series of adverse impact to economic development.Prime minister wen also "two conferences" in the work report: the current house prices has a far distance from the reasonable price.In this occasion,revealing the inner relationship between to restrain asset price bubbles and promoting the stock market and real estate market's healthy development is very necessary.The international experience shows that real estate prices and stock prices between violent shake is closely and if as soon as the price bubble burst, it will give the overall economy caused serious consequences even cause a recession.This paper, through the macro analysis, comprehensive consideration of the share price change on the influence of the real estate investment, real estate and stock prices reveal the connection between the two, That in certain conditions, due to substitution effect and extrusion effect will more than wealth effect, leading to the stock price and the real estate prices run in opposite directions. On the one hand, China's stock market's not perfect, and lead to wealth effect the weak; On the other hand, lack of investment channels to strengthen the stock and real estate of substitution between effect. To this, this paper analyzes the causes and the real estate investment. At last puts forward some policy Suggestions.
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