Traditional communication systems of down-hole equipment can hardly work under the extreme condition which includes harsh environments,strong electromagnetic interference and a very long distance of communication.The unreliable communication system may leads to huge economic loss,so that the development of a new communication system which can work reliably under the extreme down-hole condition is of great significance.This article study deeply a new communication technology,namely power line carrier communication technology which costs little,has a long distance of communication and works reliably.This article build the model of the power line used in down-hole equipment,analyzes the characteristics of the power line to guide the hardware and software design of the communication system.This article uses both hardware and software to ensure the anti-jamming capability and develops a new communication system.It's proved that this system has a communication distance of 3000m and an accurate rate of 100%,and can work reliably under the extreme down-hole condition.This system has a huge practical value and future of development.

The Poincare mapping method is used to transform the analysis of the periodic orbit of robots into that of the fixed point on the poincaré section.With the joint application of the modified Newton-Raphson Method and the simulated annealing algorithm,the initial values of iteration are obtained.The passive dynamic periodic motion of a SLIP-modeling one-legged hopping robot is studied,and the periodic orbits can be quickly acquired under given conditions.The results obtained provide a reference for the corresponding controller design.

The process of vacuum forming is introduced in this article as well as the key technology of vacuum forming,including establishment of motion function and prediction of forming time.A vacuum mould for refrigerator liner is taken as an analyzing example to analyze the process of vacuum forming by numerical simulation,based on Polyflow software,which results show that the blowing time is the key factor to control the quality of products.If blowing time is too short,thinning in local or uneven will result,while if it is too long,local wrinkles and folds may occur.By combining numerical simulation technology and motion functions the optimization for forming technology is realized.

The motion process of progressive blanking and drawing dies was analyzed and a coordination design was implemented by using movement simulation technology and motion functions,in which way precision multi-position progressive dies can have a longer service life.A further study on the structural motion of precision progressive dies indicates that coordination of complicated structural motion system should be solved for the dies.

The performance of the bracket in the interior rear-view mirror is an important factor that influences on the stability of rear-view vision.It carries on the analysis computation to the bracket based on Abaqus software,obtains its improvement program and proposes the evaluation method for finite element model of bracket for the first time.

It analyses the design method of teeth number for NGWN planetary gear transmission,deriving new formulas which provide great convenient for the gear design. It also gives a design sample of rear-view mirrors' adjuster which uses the NGWN mechanism. The results of the design example indicate that we can select the teeth number quickly by the new formulas,which can guide the mechanism's optimal design.