Since this 2D pneumatic digital valve is a closed loop mechanism, performance indexes such as stability, speediness, precision and rigidity restrict each other and it is contradictory to improve these performance indexes meantime.

Because it is a kind of closed loop mechanism structure design,its other performance indexes such as stability,speediness and precision,rigidity etc. Can not be improved simultaneously,also the effect of changing the model structure parameters of valve structure on these perofrmance indexes is not linear and monotonous.

One possible interpretation of this model is that the height of each segment is controlled by a closed loop mechanism with a proportional element as a controller.

The fundamental motivation is that TCP congestion control is an end-to-end closed-loop mechanism.

This paper deals with the difference between the general constraint of closed- loop mechanism and end link constraint of open-loop mechanism. An equation has been constituted that can clarify the knotty problem about general constraint in computing the freedom degree of mechanism. It is pointed out that the class of kipematic pairs has its definite definition if the general constraint which is in the integrate equation by E. E. Artobolefski is defined as end link constraint...

This paper deals with the difference between the general constraint of closed- loop mechanism and end link constraint of open-loop mechanism. An equation has been constituted that can clarify the knotty problem about general constraint in computing the freedom degree of mechanism. It is pointed out that the class of kipematic pairs has its definite definition if the general constraint which is in the integrate equation by E. E. Artobolefski is defined as end link constraint of open- loop. The writer proposes that modified equation by A. P. Marbishef be taken as the integrate construction equation. A separated-closed-pair method has been used for determining end link constraint. It is pointed out that the constraint conditions must be considered in defining end link constraint and analysing the independent motion on end link which is caused by kinematic pairs ih mechanism. This paper has also given some examples of computing freedom degree and made a comparison with the classical method.

本文论证了闭环机构公共约束m_i与开环机构末杆约束m′_i的差异,提出关系式:m_i=m′_i+f′_i。澄清长期以来在机构自由度计算中关于公共约束的疑难。指出И·И·Артоболевский统一结构公式中的m_i,若定义为开环末杆约束m′_i,则在自由度计算中,运动副的级有确定的统一定义。阿氏公式与F·Freudenstein公式等效。作者建议取А·П·Мальищев型修正公式:W=6n-sum from k=1kp_k+sum from i=1 m_i作为统一结构公式;并提出确定末杆约束的拆闭副法;指出应用刚体运动分解原理考察各运动副对末杆产生的独立运动时,必须考虑末杆的约束条件。文中列举若干计算例题,并与常用计算方法进行对比分析。

In this paper, the author establish a way to solve the dynamics problem of robot with closed loop mechanism.

本文提出采用凯恩（Ｋａｎｅ）动力学算法［１］懈决含有闭链机构机器人的动力学问题。

In ATM networks, congestion control plays an important role in supporting different qualities of service guarantees for a large variety of traffic categories. In this paper, we put forward an analysis model based on the rate based closed loop mechanism developed by ATM Forum, derive formulae for computing the evolution of an allowed cell rate and queue length, and obtain the maximum and minimum values of the queue length. The simulation results have shown that the formulae derived in this paper are in...

In ATM networks, congestion control plays an important role in supporting different qualities of service guarantees for a large variety of traffic categories. In this paper, we put forward an analysis model based on the rate based closed loop mechanism developed by ATM Forum, derive formulae for computing the evolution of an allowed cell rate and queue length, and obtain the maximum and minimum values of the queue length. The simulation results have shown that the formulae derived in this paper are in agreement with the simulation results, and a higher utilization ratio of network resources and a lower buffer requirement can be achieved when the control parameters of the feedback mechanism are selected properly.