Elastic Actuator Mounting for Vehicle Noise Reduction
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Solution Overview
Problem
The existing arrangements of electroacoustic actuators on vehicle bodies often result in unwanted vibration transmission, leading to undesirable noise development due to inadequate decoupling and fixation methods, which can excite the vehicle body and compromise noise reduction and sound design applications.
Innovation Solution
The use of multiple elastic holding devices spaced apart in the circumferential direction of the actuator's housing, with these devices being more rigid transversely to their holding direction, effectively decouples vibrations while ensuring adequate fixation by aligning holding directions parallel to the loudspeaker's excitation direction and arranging brackets to counteract dynamic forces, thereby reducing structure-borne noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the actuator is firmly attached to the vehicle body, then the actuator is securely fixed and stable, but the vehicle body is excited to vibrate leading to undesirable noise development
Solution Approach 1:
The patent introduces elastic holding devices as intermediary elements between the actuator housing and the vehicle body. These holding devices include elastic elements (such as rubber blocks, spring elements, or elastomeric materials) that act as mediators to decouple the rigid connection, allowing the actuator to be securely held while preventing vibration transmission to the vehicle body.
Solution Approach 2:
The patent changes the mechanical parameters of the connection by using elastic holding devices with specific elasticity and rigidity characteristics. The holding devices are designed to be elastic in the holding direction (allowing vibration isolation) while being rigid transversely to the holding direction (maintaining positional stability), thus optimizing both fixation and vibration reduction.
2Ease of operation
If the sound outlet pipe is fixed directly to the exhaust pipe, then the actuator can be easily positioned, but the housing may vibrate during operation due to inadequate decoupling
Solution Approach 1:
The elastic holding devices serve as intermediary elements that provide both easy mounting (by simplifying the attachment process to the vehicle body) and vibration decoupling (by isolating the housing from rigid connections), thus resolving the contradiction between installation ease and housing stability.
3Object-generated harmful factors
If elastic holding devices are used, then vibration transmission is reduced, but the actuator may have insufficient fixation stability
Solution Approach 1:
The patent optimizes the parameters of the elastic holding devices by designing them to be elastic in the holding direction (to reduce vibration transmission) while being rigid transversely to the holding direction (to ensure fixation stability). This directional differentiation of mechanical properties resolves the contradiction between vibration isolation and stable fixation.
Solution Approach 2:
The holding devices are designed with different mechanical properties in different directions: elastic in the holding direction and rigid transversely. This local quality differentiation allows the same component to simultaneously provide vibration isolation and stable fixation, resolving the apparent contradiction.
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
This configuration significantly reduces vibration transmission between the actuator and the vehicle body, enhancing vibrational decoupling and ensuring effective noise reduction and sound design capabilities while maintaining the actuator's stability and functionality.
Implementation Method 1
Due to the holding devices being elastic in the holding direction, vibrations of the housing in the holding direction are not transmitted to the vehicle body, or only to a greatly reduced extent.
Implementation Method 2
The holding devices are also designed to be elastic in a holding direction, while they are designed to be stiff transversely to the holding direction.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention provides an arrangement (1) of an electroacoustic actuator (2) on a vehicle body (3) of a motor vehicle, wherein the actuator (2) has a housing (4) in which at least one loudspeaker (7) is arranged, which separates a pre-volume (8) from a return volume (9) in the housing (4), and wherein the actuator (2) has a sound outlet tube (5) that projects outwards from the housing (4) and is fluidically coupled to the pre-volume (8). Reduced noise transmission into the vehicle results when the actuator (2) is held on the vehicle body (3) by several mounting devices (19) that are spaced apart from one another in a circumferential direction (20) of the housing (4), each of which is spring-elastic in one mounting direction (21) and rigid transversely thereto.