02141nam a22001337a 4500082000800000100002100008245004700029264003600076300002900112500172800141650004401869700003601913856005801949  a670  a Osama, Muhammad  aImproving Damping of Automotive Suspension  aIslamabad :bSMME-NUST ,c2026.  a76p. ;bSoft Copyc30cm.  aMost heavy-duty automotive suspensions use high-strength helical steel 
springs, which have linear elastic behavior but very little intrinsic material 
damping. So, auxiliary hydraulic dampers are the only things that keep the 
vehicle stable and comfortable to ride in. In very rough off-road conditions, 
these fluid-based dampers are very likely to break down or lose their 
effectiveness due to heat, which makes armored SUVs and other strategic 
logistics and defense platforms very vulnerable. This study presents a new 
polymer-metal composite (PMC) spring topology that is meant to provide 
built-in passive damping and fail-safe mechanical redundancy. To do this, a 
high-strength SAE 9254 steel coil spring was completely covered in a 
thermoset neoprene (chloroprene rubber) shell. A custom compression 
molding workflow was created to make sure that the adhesion between the 
two surfaces was strong and that there was no delamination. We used a servo
hydraulic universal testing machine (UTM) to test dynamic performance 
under cyclic loading conditions. We then added the resulting coefficients to a 
quarter car model on Simulink as well as 7-degree-of-freedom (7-dof) full-car 
vehicle dynamics model on MATLAB. Tests in the real-world show that 
composite architecture causes strong non-linear viscoelasticity. Transient 
oscillations die down quickly, according to time-domain analysis. This means 
that the suspension settles down much faster after a shock event. These results 
show that composite springs wrapped in neoprene are a theoretically long
lasting, fail-safe building solution that improves dynamic stability and 
completely protects the structural steel core from corrosion-related fatigue.   aMS Design and Manufacturing Engineering  aSupervisor: Dr. Najm Ul Qadir    u http://10.250.8.41:8080/xmlui/handle/123456789/57652