Glass Run Noise Evaluation via Oscillation Synthesis
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Solution Overview
Problem
Existing methods fail to effectively isolate and evaluate the noise generated by the glass run of an automobile door, known as 'glass-run noise', which is masked by other noise sources, making it difficult to diagnose and address.
Innovation Solution
A method involving sensors to detect oscillations of the door glass and frame, synthesizing these oscillations to isolate the glass run's contribution, and using an oscillator and microphone to reproduce and visualize the noise, allowing for experimental modification of the glass run's shape and material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass run noise is evaluated on a real automobile, then the noise can be detected in actual operating conditions, but the noise from the glass run cannot be separated from other noise sources
Solution Approach 1:
The patent segments the noise evaluation process into two distinct phases: (1) data collection phase where oscillations are measured on the real automobile, and (2) analysis phase where the glass run noise is isolated by comparing door glass oscillation with frame oscillation. This segmentation allows the system to benefit from real-vehicle data while eliminating the confounding effect of other noise sources through mathematical separation.
Solution Approach 2:
The patent introduces frame oscillation as an intermediary variable to isolate glass run noise. By measuring both door glass oscillation and frame oscillation, and then calculating the difference, the system uses frame oscillation as a mediator to subtract out common noise sources (engine noise, road noise, wind noise) and isolate only the glass run-specific noise.
2Ease of manufacture
If glass run noise is evaluated on an experimental bench, then the glass run can be modified repeatedly, but the oscillation conditions do not match real automobile conditions
Solution Approach 1:
The patent applies preliminary action by first collecting oscillation data from the real automobile under actual operating conditions, then using this data to guide subsequent experiments on the experimental bench. The oscillation waveforms obtained from the real vehicle are used as reference inputs for the experimental setup, ensuring that the bench tests replicate real-world conditions while allowing for repeated modifications.
Solution Approach 2:
The patent creates a copy of the real automobile's oscillation conditions by recording the actual oscillation waveforms of the door glass and frame, then reproducing these waveforms in the experimental bench tests. This copying approach allows the experimental setup to mimic real operating conditions without requiring the physical presence of the real automobile during each test iteration.
3Ease of operation
If the door glass is oscillated with the automobile stopped, then the oscillation can be controlled precisely, but the oscillation does not reflect dynamic driving conditions
Solution Approach 1:
The patent resolves this contradiction by making the test system dynamic rather than static. Instead of using fixed oscillation parameters, the system records actual oscillation waveforms from the real automobile during dynamic driving conditions, then uses these time-varying waveforms to control the experimental bench tests. This allows precise control of oscillation magnitude while maintaining adaptability to real-world dynamic conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise detection and reproduction of glass run noise, facilitating repeated experiments and design improvements to reduce noise levels, even in dynamic conditions like bumpy roads.
Implementation Method 1
detecting oscillation of the door glass (2) by a sensor (20) for the door glass and then storing the oscillation as an oscillatory wave form (300) of the door glass and detecting oscillation of the frame (100) by a sensor (30) for the frame
Implementation Method 2
making oscillation by an oscillator (40) and oscillating the door glass (2) with the automobile stopped, the oscillation corresponding to the synthesized oscillatory wave form (500)
Implementation Method 3
detecting sound of the oscillation by a microphone (50), the oscillation being made by the oscillator (40), the oscillation corresponding to the synthesized oscillatory wave form (500)
Data Source
AI summary
A method for evaluating noise of a glass run of an automobile door includes: detecting oscillation of the door glass by a sensor for the door glass and then storing the oscillation as an oscillatory wave form of the door glass and detecting oscillation of the frame by a sensor for the frame and then storing the oscillation as an oscillatory wave form of the frame, with the glass run coupling to the automobile door; synthesizing the oscillatory wave form of the door glass and the oscillatory wave form of the frame, picking out relative oscillation of the door glass in relation to the frame and storing the relative oscillation as a synthesized oscillatory wave form; making oscillation corresponding to the synthesized oscillatory wave form by an oscillator and oscillating the door glass with the automobile stopped; and detecting sound of the oscillation by a microphone.