Variable Spring Constant Support for Rotating Machine Vibration Measurement
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Solution Overview
Problem
Conventional vibration measurement devices for high-speed rotating machines face challenges in accurately measuring unbalance vibrations over a wide speed range due to fixed supporting stiffness, difficulty in attaching acceleration sensors, and inadequate simulation of practical operation conditions, leading to incomplete balance measurements of both rigid-body and elastic modes.
Innovation Solution
A vibration measurement device with an elastic support structure having a variable spring constant, which elastically supports the rotating machine, allowing for flexible support and adjustable damping, enabling accurate measurement of both low-speed and high-speed operations and reducing unbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid support structure with fixed supporting stiffness is used, then the device complexity is reduced, but the measurement precision of unbalance vibration cannot be maintained over a wide speed range
Solution Approach 1:
The support structure is designed with variable spring constant, allowing it to dynamically adjust its supporting characteristics. The spring constant can be changed from first to second values, enabling the system to adapt to different operating conditions and maintain measurement precision across a wide speed range while avoiding the need for complex rigid structures.
Solution Approach 2:
The invention changes the physical parameter of the support structure by using springs with variable spring constants. This allows the supporting stiffness to be adjusted according to different measurement requirements, improving measurement precision without requiring multiple fixed-structure configurations.
2Ease of operation
If acceleration sensors are attached on scrolls for mass production, then the ease of operation is improved, but the measurement precision is degraded due to modal mass influence and partial support
Solution Approach 1:
The invention introduces an elastic support structure with variable spring constant as an intermediary between the rotating machine and the support base. This intermediary provides stable, full-area support that reduces vibration propagation and eliminates the problems of partial support and modal mass influence, while still allowing for practical sensor attachment procedures.
3Measurement precision
If natural frequencies of support conditions are set lower than practical operation conditions, then rigid-body mode balance can be measured, but elastic mode balance cannot be adequately measured
Solution Approach 1:
The variable spring constant support structure can dynamically adjust its characteristics to match different measurement requirements. By changing the spring constant between first and second values, the system can be tuned to measure either rigid-body modes or elastic modes as needed, providing comprehensive measurement coverage that a fixed support structure cannot achieve.
4Measurement precision
If the balance of rigid-body modes is prioritized in support conditions, then low-speed measurement is improved, but high-speed elastic mode measurement capability is lost
Solution Approach 1:
The invention changes the spring constant parameter of the support structure to match different operating speed ranges. At low speeds, one spring constant value optimizes rigid-body mode measurement, while at high speeds, a different spring constant value optimizes elastic mode measurement, enabling accurate measurements across the entire speed range.
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 improves the accuracy of vibration measurements, allows for continuous balancing adjustments across different operational speeds, and reduces unbalance in rotating machines, enhancing productivity and noise reduction.
Implementation Method 1
an elastic support portion (4) that elastically supports the rotating machine (10) with respect to a support structure (2)
Implementation Method 2
a vibration detection unit (3) that detects vibration of the rotating machine (10)
Data Source
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AI summary
This vibration measurement device is configured to measure the balancing vibration of the cartridge, a kind of rotating machines, who has a rotor and a cartridge body to support the rotor rotatably for variable operating speed, and is provided with a rigidly fixed support structure, acceleration sensors which detect the vibration of the cartridge, and a flat spring which elastically supports the cartridge with respect to the support structure and has a variable spring constant of elastic support.