Piezoelectric shunt damping for alpine ski traction improvement
			
	
 
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				AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, 
Department of Robotics and Mechatronics 
Al. Mickiewicza 30, 30-059 Kra
ków
				 
			 
										
				
				
		
		 
			
			
		
		
		
		
		
			
			 
			Publication date: 2017-12-20
			 
		 			
		 
	
							
																								
		
	 
		
 
 
Diagnostyka 2014;15(1):3-9
 
 
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ABSTRACT
The  paper  investigates  the  problem  of  improving  driveability  of  alpine  skis.  That  properties  depend largely on the vibration beha
vior of a ski under differents now conditions. There is a broad 
range  of  methods  to  deal  with  vibration  damping,  both  active  and  passive,  that  have  been  described in the literature. In this paper the passive approaches were taken into consideration. It is due to the specific nature of the sport where use of  external sources of energy may be impractical. 
   Passive  shunt  damping  system  has  been  designed  for  a  commercially  available  model  of  an  alpine  ski.  The  performance  of  the  designed  system  has  been  evaluated  on  a  numerical  model  of  
the  ski.  Piezoelectric  patches  have  been  included  in  the  model  by  means  of  a  generalized impedance  that  complies  both  the  mechanical  properties  and  shunted  circuit  electrical  properties.  
The fraction of strain energy stored in a piezoelectric element at 
particular vibration modes were used  to  evaluate  the  maximum  damping  coefficient  for  first  three    resonant  modes  that  have  the  
largest influence on the ski properties. The damping system is based on piezoelectric patches that can be easily embedded in the laminated structure of a ski.