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"Development and Experimental Study of an MRF Engine Mount with Control" by Jian Yang, Shuaishuai Sun et al.

Engine mount is an essential component to support the vehicle engine and to determine the vehicle dynamic property in terms of noise, vibration, and harshness (NVH). It works as the important interface between the engine and the chassis to reduce the bad impact of the engine-induced vibrations on the car body. To this end, this paper proposed a new semi-active engine mount capable of variable stiffness as an attempt to further improve the vibration reduction capability of the current semi-active engine mount which is only capable of varying damping. This study completed the characterization test of the proposed semi-active engine mount and evaluated its capability of stiffness variability. Then a test of an engine mounted with the new mount was performed to evaluate the vibration reduction capability. The experimental results demonstrate that this proposed engine mount show variable stiffness in response to the varied magnetic field, and that it performed well in protecting the chassis ....

Mrf Engine Mount , Variable Stiffness , Vibration Reduction ,

"A semi-active variable equivalent stiffness and inertance device imple" by Donghong Ning, Haiping Du et al.

Abstract
Semi-active devices have been widely investigated and applied due to their advantages in control systems. However, for satisfying complicated applications, some semi-active devices need to be capable of controlling multiple mechanical properties, which is hard to implement with a mechanical network considering the space limitation. In this paper, a semi-active variable equivalent stiffness and inertance (VESI) device is developed by an electrical network and an electromagnetic device instead of a mechanical system. Due to that the inerter and spring can store energy, the dynamic control of their mechanical properties without the external power to compensate the stored energy will cause the system discontinuity, which will affect the control performance. Therefore, the variable damping (VD) device is applied to connect with spring or inerter in series to obtain variable equivalent stiffness or inertance properties. Then, according to the force-current analogy, an elect ....

Mechanical Network , Semi Active , Ariable Damping , Ariable Inertnace , Variable Stiffness ,

Apple may have a solution for fraying Lightning cables

If you ve ever had an iPhone Lightning cable in your car, you already know how fragile they are. Apple may now have a solution that could also protect any kind of cable.
Apple is never going to say that Lightning cables have a death wish, but it has come close in a newly revealed patent application that is really about fixing the problem. Cable with Variable Stiffness, does not mention Lightning once, nor does it say anything approaching the word frayed.
It is well known that bending of the cable near the termination point may cause unwanted strain on the wire connections, which may lead to cable failure, it admits. Accordingly, it is common to provide a strain relief sleeve made of a stiff material around the end region of the cable. ....

Christophers Graham , Iphone Lightning , Variable Stiffness , கிறிஸ்டோபர்கள் கிரஹாம் , தொலைபேசி மின்னல் ,

Apple patent application imagines charging cables that might not fray so easily

Apple patent application imagines charging cables that might not fray so easily
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Image: Apple
Apple’s charging cables aren’t exactly known for their durability. They often fray after a year or two and can even break down to the point where they won’t charge your device at all. (I’ve also noticed they can turn an increasingly sour shade of yellow.) But Apple is apparently working on some ideas to make its cables more durable, filing a patent application for a “Cable with Variable Stiffness.”
AppleInsider, describes some different ideas for a cable that wouldn’t fray as easily. The methods would give different parts of the cable varying levels of stiffness, while keeping the cable uniformly thick. They would also replace what Apple calls the “strain relief sleeve” the stiff cap you’ll find at the ends of many cables. ....

Variable Stiffness , Apple Insider , ஆப்பிள் உள் ,