Gear adaptive variator may be the toothed transmission with the variable transfer ratio which is definitely adapting to the adjustable loading. Unsuccessful tries of creation of a gear variator were undertaken repeatedly. The main problem is-maintenance of continuous engagement of cogwheels of a variator. The decision of this problem can be based on usage of a kinematic chain with two degrees of freedom. Earlier it was proved that kinematic chain with shut contour possesses the result of power adaptation. The apparatus variator can be carried out in the type of the closed differential mechanism. The external variable technological loading changes the transfer ratio itself without any control system. The apparatus variator opens essentially new idea of creation of adaptive engineering for devices with variable technological level of resistance (for example, adaptive gearbox of car). The theory of a gear variator is founded on discovery «Impact of push adaptation in mechanics» which is certainly released in leading editions of globe press. In the paper the bases of the idea of a gear adaptive variator are offered.
There are various kinds of DC drive setups with the designation depending upon the source of their DC current. This is the case in emergency backup systems. For example, power plant life have a bank of batteries supplying DC current to emergency oil pumps that supply oil to the bearings of a turbine during a crisis shutdown. A second source of DC current could possibly be from a (Motor-Generator) MG arranged. In cases like this, the electric motor drives a DC generator that generates the DC current. These first two types of drives offer pure DC current, therefore they do not produce any significant electrically induced indicators in regards to vibration. The last kind of DC drive, and the one which will be discussed in this paper, uses silicon controlled rectifiers (SCRs) to rectify AC current into DC Current. These drives produce a DC transmission with AC pulses that match the firing of the SCRs. These pulses or lack thereof in the case of failed SCRs and or gating complications produce vibration signals that can be analyzed to determine the source of the defect. Improper tuning of variable speed drives may also generate vibration problems.
Rectification: The first idea that needs to be understood in regards to DC drives can be rectification. Rectification may be the process of switching AC current into DC current. Pictured below is usually a fifty percent wave rectifier and the resulting output. Only the positive portion of the current Al passes through the rectifier.
Complete Wave Rectification: The above plot shows a Variator Gearbox standard spectrum from a current probe on the lead to a DC drive. As is seen, the only major component reaches 360HZ. That is normal due to the non-sinusoidal nature of the 
current waveform.
