Laundry Machine Tuned Mass Damper for Multi-Directional Vibration
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Solution Overview
Problem
Existing laundry treating machines face challenges in effectively damping vibrations across multiple directions due to the eccentric arrangement of laundry, leading to resonance issues and increased complexity in calibration and implementation of traditional tuned mass dampers.
Innovation Solution
A vibration damper device is introduced, featuring a tuned mass damper with elastic members having equal rigidity in multiple directions, comprising deformable components that interact to provide damping over a range of frequencies, reducing sensitivity to frequency variations and eliminating the need for additional volumes or complex recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dampers are used to limit vibration amplitude, then vibration amplitude is reduced, but high forces are transmitted to the frame at high revolution speeds causing frame vibrations and noise
Solution Approach 1:
The vibration control function is segmented into two independent systems: dampers mounted on the oscillating assembly for low-speed vibration control, and a tuned mass damper mounted on the frame for high-speed vibration control. This segmentation allows each system to operate optimally in its designated speed range without interfering with the other, solving the contradiction between vibration amplitude control and frame vibration prevention.
Solution Approach 2:
The tuned mass damper acts as an intermediary system between the drum and the frame. It absorbs and dissipates high-frequency vibrations at high revolution speeds through its dedicated damping mechanism, preventing these vibrations from being transmitted to the frame while maintaining the effectiveness of the primary dampers at lower speeds.
2Reliability
If a tuned mass damper with a spring is used to reduce frame vibrations, then vibrations in one direction are reduced, but vibrations in other three-dimensional directions are not effectively controlled
Solution Approach 1:
The solution merges multiple damping mechanisms into a single integrated tuned mass damper system. The additional mass is connected to the frame through multiple elastic members arranged in different orientations, combining their individual directional damping capabilities into a unified system that provides effective vibration control in all three-dimensional directions simultaneously.
Solution Approach 2:
The elastic members are arranged in multiple spatial dimensions rather than along a single axis. This dimensional expansion allows the tuned mass damper to counteract vibrations occurring in any direction within the three-dimensional space, transforming a one-dimensional solution into a comprehensive multi-directional vibration control system.
3Adaptability or versatility
If multiple springs are provided to damp vibrations in two directions, then multi-directional vibration control is achieved, but the system becomes bulky and expensive requiring many springs
Solution Approach 1:
The elastic members are designed to perform multiple functions simultaneously: they provide suspension for the additional mass, enable multi-directional vibration damping, and serve as the connecting mechanism between the tuned mass damper and the frame. This multi-functionality reduces the need for separate components for each function, thereby reducing overall system complexity and component count.
Solution Approach 2:
The elastic members are designed with optimized parameters including their arrangement geometry, rigidity characteristics, and damping coefficients. By carefully selecting and adjusting these parameters, the system achieves effective multi-directional vibration control with a minimal number of elastic members, avoiding the need for numerous springs and reducing system bulk.
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 solution effectively dampens vibrations in all directions, simplifies the manufacturing process, and reduces machine noise and frame movement during high-speed operations by providing a more efficient and compact damping mechanism that operates over a broader frequency range.
Implementation Method 1
A vibration damper device is introduced, featuring a tuned mass damper with elastic members having equal rigidity in multiple directions, comprising deformable components that interact to provide damping over a range of frequencies
Implementation Method 2
elastic members having equal rigidity in multiple directions
Data Source
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Figure 5~7
AI summary
A laundry treating machine (1, 1'), of the type comprising at least one frame (2) for supporting a rotary drum (5) adapted to contain the laundry to be subjected to treatment, said drum (5) being housed inside a tub (4), wherein at least the tub (4) and the drum (5) are part of an oscillating assembly (3) that oscillates relative to the frame (2), and wherein the oscillating assembly (3) is associated with a tuned mass damper (10) comprising at least one mass (12, 12A) and one elastic member (11, 11A, 11', 11", 11'", 11*) having the same rigidity in at least more than one direction.