曲柄存在的条件两种证明方法的比较

The Comparison of the Two kinds of Proofs Methods of Cranks Existence

铰接四杆机构根据连架杆是否为曲柄可分为三种类型:曲柄摇杆机构、双曲柄机构和双摇杆机构.连架杆什么条件下 才有可能成为曲柄,目前有两种不同的方法来推导连架杆成为曲柄的条件,两种方法各有所长,下面就两种方法予以比较.

Articulated four pole mechanism can be divided into three types according to whether connecting frame pole is a crank or not : Crank shaking pole mechanism , double crank mechanism and double shaking pole mechanism. In which conditions can connecting frame pole be crank? There are two different methods to deduce the conditions of cranks being connecting frame pole at present. But the two methods both have its own advantages . This is the comparison of the two methods.