The closure of an automotive trunk lid is a rapid, dynamic event in which impact forces and momentum can temporarily over-compress the seal before the system stabilizes. These transient effects play a critical role in sealing effectiveness, noise generation, and long-term durability. 

Analyzing how sealing forces and contact pressures evolve during trunk lid closure provides valuable insight that cannot be obtained through static testing alone. 

During a trunk slam, initial contact forces are typically high and may oscillate several times before reaching equilibrium. This behavior can reveal localized sealing issues such as uneven compression, pressure gaps, or excessive loading that may lead to noise, water leaks, or premature seal wear. 

Dynamic analysis makes it possible to observe how pressure distribution changes millisecond by millisecond throughout the closure event, helping engineers understand both immediate impact effects and residual sealing performance. 

Measurement Approach 

Sensor Products International provides, flexible, cusomized pressure sensing solutions that can be placed directly between the trunk lid and the seal without altering normal closure behavior. High-speed data acquisition captures rapid changes in force and pressure during the slam event, allowing detailed time-based analysis. 

Pressure and force data can be reviewed frame-by-frame to evaluate how sealing loads evolve, stabilize, and redistribute after impact. This approach supports both dynamic and static characterization of seal performance and provides insight into material behavior under repeated impact loading. 

Trunk Lid Seal Measurement Applications 

• Identification of gaps or discontinuities in seals 
• Detection of weak or unevenly loaded sealing regions 
• Analysis of low and high pressure zones 
• Measurement of trunk lid closure forces 
• Reduction of excessive pressure near weld beads 
• Improvement of low-pressure regions near spot-weld dimples 
• Validation and durability testing 
• Seal material evaluation