Two-Stage Compressor Suspension for Vehicle NVH Isolation
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Solution Overview
Problem
Air conditioner compressors in vehicles experience poor NVH performance due to direct connection with engines or motor housings, leading to low-order vibration and noise, which affects ride comfort and complicates pipeline design.
Innovation Solution
A suspension system with rubber and resilient dampers, including damper springs, is used to decouple the compressor from the vehicle body, forming a two-stage vibration isolation system that absorbs vibrations and reduces noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compressor is fixed directly to the motor or engine housing, then the pipeline layout is simplified, but the NVH performance deteriorates due to vibration transmission
Solution Approach 1:
The patent introduces a suspension system with rubber dampers and resilient dampers as intermediary components between the compressor and the motor housing. This mediator absorbs vibration energy and prevents direct transmission of low-order vibrations to the vehicle body, thereby improving NVH performance while maintaining a reasonable pipeline layout
2Length of moving object
If the compressor is fixed on the subframe or crossbeam, then the pipeline length is reduced, but the ride comfort deteriorates due to high frequency vibration noise
Solution Approach 1:
The suspension system acts as an intermediary between the compressor and the subframe/crossbeam, using rubber dampers for low-frequency vibration isolation and resilient dampers for high-frequency vibration damping. This dual-stage damping approach effectively reduces high frequency vibration noise transmission to the vehicle body while allowing the compressor to be positioned closer to the engine
Solution Approach 2:
The patent employs composite damping materials including rubber (for elastic deformation and low-frequency vibration absorption) and metal springs with dampers (for high-frequency vibration damping). This combination of different material properties creates a multi-frequency vibration isolation system that addresses both low-order and high-frequency NVH issues
3Device complexity
If hard connection is used between compressor and engine, then the structural simplicity is improved, but the vibration energy absorption deteriorates
Solution Approach 1:
The patent changes the connection parameters from rigid (hard connection) to compliant (soft connection with dampers). The rubber dampers provide non-linear elastic characteristics that allow the connection to remain simple in structure while significantly improving vibration energy absorption through material compliance and hysteresis damping
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
The suspension system effectively reduces noise and improves ride comfort by absorbing vibrations, ensuring better NVH performance and durability while maintaining a low rigid body mode.
Implementation Method 1
a plurality of rubber dampers; a first compressor bracket connected with the vehicle air conditioner compressor through the plurality of rubber dampers
Implementation Method 2
a plurality of resilient dampers with a plurality of damper springs
Implementation Method 3
The vibration energy generated by the air conditioner compressors is generally absorbed by suspensions
Data Source
AI summary
A suspension system for a vehicle air conditioner compressor and a vehicle are provided. The suspension system includes: a plurality of rubber dampers a plurality of resilient dampers with a plurality of damper springs; a first compressor bracket connected with the vehicle air conditioner compressor through the plurality of rubber dampers; and a second compressor bracket connected with a vehicle body and with the first compressor bracket through the plurality of resilient dampers. The suspension system for the vehicle air conditioner compressor and the vehicle can solve the problem of low-order vibration and achieve more reasonable modal decoupling, thereby ensuring that the vehicle have better NVH performance.