Model reduction and active control of flexible beam using internal balance technique

The internal balance technique is effective for the model reduction in flexible structures, especially the ones with dense frequencies. However, due to the difficulty in extracting the internal balance modal coordinates from the physical sensor readings, research on this topic has been mostly theoretical so far, and little has been done in experiments or engineering applications. This paper studies the internal balance method theoretically as well as experimentally and designs an active controller based on the reduction model. The research works on a digital signal processor （DSP） TMS320F2812- based experiment system with a flexible beam and proposes an approximate approach to access the internal balance modal coordinates. The simulation and test results have shown that the proposed approach is feasible and effective, and the designed controller is successful in restraining the beam vibration.

Research on adsorption mechanism of wall climbing robots based on internally balanced theory

The internally balanced theory proposed by the Japanese researchers,solved the contradiction between adsorption ability and moving capability of the permanent magnetic adsorption mechanism.However,it still has some problems when applied to wall climbing robots.This paper analyzes and improves this theory,and the improved internally balanced theory satisfies the requirements of the adsorption mechanism significantly.Finally,a practical prototype is proposed based on this method,and both the analysis using ANSYS and the experiment results justify the design validity.

Balanced Development of Internal and External Trade

The CMC International and Domestic Trade Division under the China National Machinery Import & Export Corporation has, in accordance with the CMC’s strategic goals, worked out the following business guidelines: internal trade is the basis of external trade, and external trade is a supplementary to internal trade; domestic and overseas markets and resources should be used effectively, and internal trade and external trade should be coordinated and handled in a unified way. The Division’s business concept is to conduct trade-dominated business backed by

The U.S. Post-crisis Era Sustainable and Balanced Growth Strategy： Policies and Assessment

The financial crisis in 2008 dragged the U.S. economy into the dilemma of imbalanced and sluggish growth. Thus, the federal government carried out the sustainable and balanced growth strategy. This paper draws the framework of U.S. new growth strategy and summarizes the main measures applied in last five years. Further, it assesses the comprehensive strategic effects on economy and finally discusses the future challenges for the U.S..

Adjustment of Global Imbalances and Its Impact on China’s Economy

The present paper discusses ways of adjusting the imbalances of the global economy and its impact on China＇s economy. The analysis in the paper shows that the cut of US fiscal deficits and the appreciation of the currencies of East Asia, including China＇s RMB, are necessary for a smooth adjustment of the global imbalances. The adjustments will have a positive impact on China＇s economy and will help China realize its external balance. The increase in public spending on the service sector along with the appreciation of RMB will help China realize the internal balance too. The adjustment of the global imbalances will create opportunities and an external pushing force for China in its industrial restructuring and shift in the model of economic growth.

A dynamic two-zone model of continuous fluidized bed layering granulation with internal product classification

A dynamic two-zone model is proposed to address the formation of granulation and drying zones in fluidized bed layering granulation processes with internal product classification. The model assumes a constant volume for the granulation zone, but a variable overall volume for the fluidized bed to account for classified product removal. The model is used to study the effect of various process parameters on dynamics and process stability. Stability is shown to depend on the separation diameter of product removal and the flow rate of the injected liquid. A lower and upper range of separation diameters with stable process behavior are found. In an intermediate range instability in the form of self-sustained oscillations is observed. The lower stability boundary is in qualitative agreement with recent experimental observations （Schmidt, Bück, ＆ Tsotsas, 2015）; the upper boundary was reported in a theoretical paper by Vreman, Van Lare, and Hounslow （2009） based on a single zone model.

泊松比对内平衡Blatz-Ko材料模型的影响

基于将微积分变分理论应用于变形梯度的两因子乘性分解,最近开展了对内平衡可压缩超弹性材料的研究.这一新处理方法的有限元公式实现揭示了Blatz-Ko材料模型的一种特殊形式.尤其是通过使用泊松比的固定值简化了材料模型.这项工作证明了Blatz-Ko模型的内部平衡公式是可压缩变形范围内泊松比的函数.

MODEL REDUCTION AND ACTIVE CONTROL FOR A FLEXIBLE PLATE

The internal balance technique is effective for model reduction in flexible structures, especially those with dense frequencies. However, due to the difficulty in extracting the internal balance modal coordinates from the physical sensor readings, research so far on this topic has been mostly theoretic and little on experiment or engineering applications. This paper, by working on a DSP TMS320F2812-based experiment system with a flexible plate and bringing forward an approximating approach to accessing the internal balance modal coordinates, studies the internal balance method theoretically as well as experimentally, and further designs an active controller based on the reduced model. Simulation and test results have proven the proposed approximating approach feasible and effective, and the designed controller successful in restraining the plate vibration.

An International Balancing Act

Despite improvements in Viet Nam-U.S.relations,Viet Nam seeks to strike a balance between China and the United