Washing Machine Dynamic Absorber for Transient Vibration Damping
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Solution Overview
Problem
Existing dynamic absorbers in washing machines are limited in effectively absorbing transient oscillations due to low damping ratios, increased viscoelastic member damage, and reduced lifespan, particularly when subjected to shear stress and horizontal oscillations.
Innovation Solution
A dynamic absorber design with a moving mass slidably disposed on a support plate, featuring separate elastic dampers for transient and continuous oscillations, and a slider structure to enhance absorption capabilities, minimizing friction and maximizing oscillation absorption across the drum's rotational range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a viscoelastic member is disposed on a bottom surface of a moving mass to absorb oscillation, then the oscillation absorption function is provided, but the load of the moving mass continuously acts on the viscoelastic member causing damage and performance deterioration
Solution Approach 1:
The patent divides the oscillation absorption function into two separate components: a first moving mass for absorbing continuous oscillation and a second moving mass for absorbing transient oscillation. This segmentation prevents the continuous load of a single large moving mass from deteriorating the viscoelastic member, as each component has reduced mass and thus reduced continuous loading on its respective viscoelastic member.
Solution Approach 2:
The patent introduces a slider mechanism that allows the second moving mass to move horizontally with reduced friction during transient oscillation. This dynamic element enables the transient oscillation absorption without transferring excessive continuous load to the viscoelastic member, thereby extending its lifespan while maintaining absorption effectiveness.
2Reliability
If the moving mass oscillates horizontally using shear stress in the lateral direction, then the oscillation is absorbed, but the damping ratio is low and transient oscillation is not effectively absorbed
Solution Approach 1:
The patent separates continuous oscillation absorption and transient oscillation absorption into two distinct moving masses with different mechanisms. The first moving mass uses traditional viscoelastic shear stress for continuous oscillation, while the second moving mass uses a slider mechanism for transient oscillation, allowing each to be optimized for its specific function without compromise.
Solution Approach 2:
The patent replaces part of the viscoelastic shear stress mechanism with a slider mechanism for transient oscillation absorption. The slider reduces frictional resistance compared to viscoelastic deformation, enabling more effective absorption of transient oscillations with higher damping ratio while maintaining the viscoelastic member's integrity.
3Reliability
If the moving mass is shaken in the lateral direction to absorb transverse oscillation, then oscillation is absorbed, but the left and right ends of the moving mass are tilted downward due to bending of the viscoelastic member, limiting effective absorption
Solution Approach 1:
The patent divides the oscillation absorption into two separate moving masses: the first moving mass handles continuous oscillation and the second moving mass handles transient oscillation. This segmentation ensures that the second moving mass subjected to lateral shaking does not overload and bend the viscoelastic member, as its mass is reduced and its function is specifically transient rather than continuous.
Solution Approach 2:
The introduction of the slider mechanism allows the second moving mass to move horizontally with minimal friction during transient oscillation events. This dynamic element reduces the load on the viscoelastic member during transient shaking, preventing excessive bending and maintaining the horizontal stability of the moving mass structure.
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 design effectively reduces oscillation displacement in washing machines by optimizing the absorption of both transient and continuous oscillations, improving stability and extending the lifespan of the viscoelastic components.
Implementation Method 1
an elastic damper disposed on a side surface of the second moving mass
Implementation Method 2
a slider disposed on a bottom surface of the second moving mass
Implementation Method 3
a viscoelastic member is disposed on a top surface of the frame
Data Source
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AI summary
A laundry treating apparatus is provided. The laundry treating apparatus includes a cabinet (11), a drum accommodated in the cabinet (11), a tub (16) accommodating the drum, and a dynamic absorber (20) provided to absorb oscillation of the cabinet (11). The dynamic absorber (20) includes a support plate (21) coupled to the cabinet (11), a first moving mass (23) movably disposed on the support plate (21) to absorb oscillation transmitted to the cabinet (11), and a second moving mass (24) movably disposed on the support plate (21) to absorb oscillation transmitted to the cabinet (11). A support (28) comes into line or point contact with a bottom surface of the first moving mass (23) so that the first moving mass (23) has an attenuation ratio.