Washer Shock Absorber Damping for Transient and Steady Vibration
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Solution Overview
Problem
Conventional laundry processing machines fail to effectively control damping forces during transient and steady-state vibrations, leading to excessive noise and vibration transfer to surrounding components.
Innovation Solution
A laundry processing machine with a shock absorber system that actively adjusts damping force in response to outer tub vibrations, using a combination of a cylinder, piston, slide member, and friction member to manage vibrations, allowing for controlled displacement and friction to absorb and dissipate energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional suspension is used to attenuate vibrations, then vibration damping force is provided, but the outer tub cannot naturally vibrate in steady state and excessive noise is produced
Solution Approach 1:
The shock absorber employs a slide member guide that rotates between a first rotational position and a second rotational position based on vibration characteristics. In the first position, the guide provides limited displacement to generate friction-based damping force during transient vibrations. In the second position, the guide allows larger displacement to reduce damping force during steady-state vibrations, enabling the system to adapt to different vibration conditions dynamically
Solution Approach 2:
The system changes the damping parameter by altering the displacement of the slide member guide relative to the piston. By rotating the guide between two positions, the system modifies the friction characteristics and damping force, transitioning from high damping during transient vibrations to low damping during steady-state vibrations
2Reliability
If conventional suspension is designed to attenuate vibrations in transient section, then shock absorption is improved, but vibration in steady state is transferred to surrounding components
Solution Approach 1:
The shock absorber dynamically adjusts its damping characteristics by rotating the slide member guide between two positions. During transient vibrations, the guide is positioned to provide limited displacement and high damping force for shock absorption. During steady-state vibrations, the guide rotates to a position allowing larger displacement and reduced damping force, preventing vibration transfer to the cabinet and floor
3Force
If friction member is applied to generate friction with piston, then damping force is increased, but displacement of slide member is restricted
Solution Approach 1:
The system dynamically controls the friction-based damping force by rotating the slide member guide between two positions. When the guide is in the first rotational position, friction between the friction member and piston generates damping force with limited displacement. When rotated to the second position, the guide allows larger displacement while reducing the frictional damping effect, thus adapting to different operational requirements
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 system effectively reduces noise and vibration transfer during steady-state operations, stabilizing the machine and reducing the time to initiate drying operations, while maintaining a larger inner space within the casing.
Implementation Method 1
a friction member provided to generate friction with the piston
Implementation Method 2
a shock absorber coupled, at one end thereof, to the casing and coupled, at the other end thereof, to the outer tub to absorb vibration of the outer tub caused by rotation of the inner tub
Data Source
AI summary
A laundry processing machine including a casing, an outer tub supported in the casing, an inner tub rotatably provided in the outer tub, and a shock absorber. The shock absorber is coupled, at one end thereof, to the casing and coupled, at the other end thereof, to the outer tub to absorb vibration of the outer tub caused by rotation of the inner tub. The shock absorber actively provides a damping force in response to the vibration of the outer tub.