Stiffening Bracket for Engine Pump Resonance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines connected in-line with hydrostatic/hydraulic pump packages often experience resonance due to matching excitation frequencies, leading to potential damage or destruction from vibrations.
Innovation Solution
A stiffening bracket is mounted to the flywheel housing and engine, altering the natural frequency of the engine/pump system to prevent resonance by increasing the system's frequency beyond the engine firing frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine is connected in-line with the hydraulic pump package, then power transmission efficiency is improved, but resonance occurs when engine firing frequency matches the natural frequency of the engine/pump system
Solution Approach 1:
The patent modifies the natural frequency parameter of the engine/pump system by adding a stiffening bracket that increases system stiffness. This changes the natural frequency away from the engine firing frequency, eliminating resonance while maintaining the in-line power transmission configuration.
Solution Approach 2:
The stiffening bracket introduces additional structural rigidity to the engine/pump mounting system, effectively altering the system's dynamic characteristics and natural frequency without changing the fundamental in-line power transmission arrangement.
2Power
If the engine/pump system operates at its natural frequency, then system response is maximized, but resonance causes vibrations that can damage or destroy the system
Solution Approach 1:
The patent acknowledges that resonance can amplify system response but converts this potentially harmful phenomenon into a beneficial one by deliberately tuning the system's natural frequency away from operating frequencies, thus eliminating harmful vibrations while maintaining efficient power transmission.
Solution Approach 2:
By modifying the stiffness parameter of the mounting system through the added bracket, the natural frequency is shifted to a value that prevents resonance with engine firing frequencies, thereby eliminating harmful vibrations.
3Reliability
If a stiffening bracket is added to alter the natural frequency, then resonance is prevented, but device complexity increases
Solution Approach 1:
The stiffening bracket is divided into multiple segments or mounting points that attach to different parts of the engine and pump assembly, allowing the frequency alteration function to be distributed across several connection points rather than requiring a single complex structure.
Solution Approach 2:
The stiffening bracket serves multiple functions: it alters the natural frequency to prevent resonance, provides structural support for the pump package, and maintains proper alignment between engine and pump components, thereby reducing overall system complexity.
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
Prevents resonance and associated damage by ensuring the engine/pump system operates outside its natural frequency, enhancing durability and reducing operator discomfort from vibrations.
Implementation Method 1
the excitation frequency from the combustion firing of the engine can match the natural frequency of the engine/pump system. If the engine firing frequency matches the natural frequency of the engine/power conversion system, the engine/pump will be excited and will go into resonance
Data Source
AI summary
A power machine with an internal combustion engine and an in-line hydrostatic/hydraulic pump package includes a stiffening bracket which mounts a flywheel housing to the engine and is configured to change the natural frequency of the engine/pump package so that the engine firing frequency does not match the natural frequency of the engine/pump package.