![]() Stradivari Middle armrest Objectionable Stick-Slip Pleasant Stick-Slip Martin Trapp, Ford Motor Company,Ĩ Martin Trapp, Ford Motor Company, 5-18-06 Shear Movements as Small as 1mm Between Surfaces Can Generate Noise Many Parts Can Move 5mm – 10mm (body twist) Static Coefficient of Friction Creates a Storage/Release of Energy Event (single event, Single Stick Slip, SSS = tick) Multiple Adjacent Storage/Release Events Cause Unacceptable Noise (multi event, Multiple Stick Slip, MSS = squeak) Without Shear there is no opportunity for noise Majority of movement is between 0.5mm and 5mm Gradual SRE does not cause noise Martin Trapp, Ford Motor Company,Ħ Martin Trapp, Ford Motor Company, 5-18-06 They can be categorized by physical phenomena Squeak: frictional stick/slip caused by rubbing contact of adjacent parts i.e., door vinyl trim squeaks against to sheet metal Rattle: impact contact of adjacent parts i.e., glovebox latch rattles against striker Buzz: noise radiated from part undergoing resonance vibration i.e., windshield molding buzzes Martin Trapp, Ford Motor Company, These noises are generally random and transient (short time). S&R are subset of all customer Unexpected Noises (UN). Squeak, Squeak Martin Trapp, Ford Motor Company,Ĥ Martin Trapp, Ford Motor Company, 5-18-06 These designs need to be incorporated early enough in the vehicle line program in order to be both feasible and cost effective. The most effective way to cut warranty costs and eliminate squeaks and rattles from a vehicle is to design component, subsystems, and systems that will resist the inputs and excitations of the road and powertrain. Objective : To assure that the vehicle exhibits robust S&R preventative strategies. Squeak and Rattle 101 Martin Trapp Ford Motor Company NVH S&R Department Martin Trapp, Ford Motor Company,Ģ Martin Trapp, Ford Motor Company, 5-18-06 1 Martin Trapp, Ford Motor Company, 5-18-06
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