Related Experiment Video
Updated: Aug 5, 2025
10:52
Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
Published on: April 13, 2016
8.9K
Multi-phase composite synchronization of three vibrators in a space far-resonant vibration system
Shuangquan Shi1, Pan Fang2, Yongjun Hou1
1School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China; Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan Province, Southwest Petroleum University, Chengdu 610500, China.
ISA Transactions
|March 24, 2023
Summary
This study introduces a novel multi-phase composite synchronization scheme for vibration systems, enhancing control and self-synchronization. The research identifies specific phase differences to avoid chaotic behaviors and ensure stable operation.
Area of Science:
- Mechanical Engineering
- Control Systems Theory
- Vibration Analysis
Background:
- Self-synchronization and control synchronization in vibration systems face limitations due to inherent characteristics and cost.
- Existing methods often struggle to balance performance with economic viability.
Purpose of the Study:
- To propose a multi-phase composite synchronization scheme for space far-resonant vibration systems with three vibrators.
- To overcome the restrictions of individual synchronization methods by combining their strengths.
Main Methods:
- Developed a mathematical model and applied a sliding mode control (SMC) algorithm for multi-phase control synchronization.
- Analyzed the self-synchronization mechanism of two vibrators using the small parameter average method and Routh-Hurwitz criterion.
- Conducted simulations to validate multi-phase composite synchronization states.
Main Results:
- Multi-phase composite synchronization is achievable in stable operational regions for the three-vibrator system.
- Severe mass asymmetry in eccentric rotors (ERs) can induce chaotic behaviors at specific phase differences (PDs).
- Controlled PDs between -1.99 to -1.67 and 1.63 to 2.1 radians should be avoided to prevent chaos.
Conclusions:
- The proposed scheme enables stable multi-phase composite synchronization under specific conditions.
- Avoiding controlled PDs around -0.4 radians is crucial for robust synchronization ability.
- Careful management of phase differences and rotor asymmetry is essential for reliable vibration system operation.
Related Concept Videos
01:19Vibrating Concrete
144
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
144
01:19Concept of Resonance and its Characteristics
5.1K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.1K
01:23Parallel Resonance
246
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
246
01:09Torsional Pendulum
5.7K
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
5.7K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.1K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.1K
01:21Generation of Three-Phase Voltage
435
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
As the rotor...
435