Hot runner vibration primarily affects sensor performance through four core mechanisms: hysteresis amplification, increased repeatability error, structural and signal interference, and thermal stress coupling damage. Specifically:
1. Amplifying Hysteresis and Reducing Measurement Accuracy: Hysteresis is an inherent deviation in the output result of a sensor under the same input due to the influence of previous inputs. Continuous vibration of the hot runner keeps the sensor in a dynamic stress environment, significantly amplifying the hysteresis effect. Vibration causes the internal elastic elements/sensitive structures of the sensor to fail to reset instantaneously, resulting in systematic deviations in measurement results, ultimately directly reducing data accuracy and interfering with the reliable output of parameters such as temperature and pressure in the hot runner.
2. Inducing Repeatability Errors and Disrupting Measurement Consistency: Hot runner vibration can lead to mechanical fatigue and dynamic environmental fluctuations. Long-term vibration may cause slight displacements or changes in the state of internal components of the sensor. Multiple measurements under the same conditions will produce inconsistent results, leading to increased repeatability error and making it impossible to guarantee stable measurement output.
3. Direct Performance Degradation and Multiple Errors
Structural Fatigue Damage: High-frequency continuous vibration gradually causes micro-damage to the sensor structure. Long-term accumulation can disrupt overall stability and even directly lead to structural failure.
Signal Drift and Noise: Vibration interferes with the internal signal acquisition path of the sensor, resulting in unstable output signals, introducing additional noise, and ultimately causing measurement errors.
Frictional Heat Generation Interference with Temperature Compensation: Vibration, accompanied by friction between components, generates additional heat, altering the sensor's operating temperature, disrupting the original temperature compensation performance, and further amplifying temperature measurement deviations.
4. Coupled with Thermal Stress, Accelerating Sensor Failure
The hot runner itself experiences drastic temperature changes. Vibration can couple with thermal stress, causing damage: Vibration amplifies structural deformation caused by thermal expansion and contraction, accelerates the propagation of internal microcracks, and is more likely to cause solder joint breakage, package cracking, and other problems, ultimately leading to premature sensor failure. For MEMS vibration sensors, vibration also exacerbates stiffness drift caused by thermal stress in the package, further amplifying sensitivity deviations.
