# Design and Optimization of a New Type of Magnetic Suspension Vibration Absorber for Marine Engineering

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## Abstract

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## 1. Introductions

## 2. Materials and Methods

#### 2.1. Topology and Working Principle

#### 2.1.1. Magnetic Suspension Structure

#### 2.1.2. Mathematical Method

#### 2.2. Simulation Study of Magnetic Suspension Structure

#### 2.2.1. Numerical Verification

#### 2.2.2. Material Research

#### 2.2.3. Research on Control Current

## 3. Magnetic Suspension Structure Design and Optimization

#### 3.1. Armature Optimization

#### 3.2. Inner Diameter of Inner Reinforcing Ring

#### 3.3. Width of Inner Reinforcing Ring

#### 3.4. Width of Outer Reinforcing Ring

## 4. Results and Discussion

#### 4.1. New Armature Structure Magnetic Flux Density

#### 4.2. New Armature Structure Electromagnetic Force

#### 4.3. Performance Improvement

#### 4.4. Electromagnetic Characteristics

## 5. Conclusions

- (1)
- DT4 demonstrated outstanding electromagnetic performance when used as the armature and electromagnet material, compared to gray cast iron, silicon core iron, and molybdenum permalloy, respectively. The armature is subjected to the most electromagnetic force (68.2 N–871.7 N more than the other three materials) when the electromagnet and armature material are DT4 under the same control current;
- (2)
- The electromagnetic performance of the new unilateral magnetically suspension structure is best when the inner reinforcing ring has an inner diameter of 10 mm, the inner reinforcing ring is 24 mm wide, and the outer reinforcing ring is 12 mm wide. At this point, the electromagnetic force output is also increased by 20.19% (by 331.6 N);
- (3)
- Suspension force and magnetic flux densities are more positively correlated with the control current in the new symmetric magnetic suspension structure at control currents of 7 A (6 A), where the maximum output suspension force is 461.4 N and the maximum magnetic flux density is 1.6642 T. This represents a 19.14% (by 74.12 N) increase in suspension force over the original version of the magnetic suspension structure;
- (4)
- The response interval of the suspension force is significantly stretched by the novel symmetric magnetic suspension structure, and the corresponding interval of system stiffness is also greatly increased. The magnetic suspension damper’s ability to adapt to more complex vibration-damping situations can be achieved by altering the control current, which also improves the magnetic suspension damper’s vibration-damping performance. This study can serve as a guide for improving and modernizing the magnetic suspension damper, and it also offers suggestions for reducing vibration and noise in engineering.

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Data Availability Statement

## Conflicts of Interest

## References

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**Figure 9.**Electromagnetic force and magnetic flux density of armature (control current is 7 A): (

**a**) Electromagnetic force distribution; (

**b**) Magnetic flux density distribution.

**Figure 12.**The influence of inner diameter of inner reinforcing ring on magnetic flux density and electromagnetic force: (

**a**) Magnetic flux density; (

**b**) Electromagnetic force.

**Figure 13.**The influence of inner reinforcing ring width on magnetic flux density and electromagnetic force: (

**a**) Magnetic flux density; (

**b**) Electromagnetic force.

**Figure 14.**The influence of the width of the outer reinforcing ring on the magnetic flux density and electromagnetic force: (

**a**) Magnetic flux density; (

**b**) Electromagnetic force.

**Figure 15.**Magnetic flux density of two kinds of magnetic suspension unilateral structure: (

**a**) Old structure; (

**b**) New structure.

**Figure 19.**Magnetic flux density and suspension force of two magnetic suspension structures: (

**a**) Magnetic flux density; (

**b**) Suspension force.

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## Share and Cite

**MDPI and ACS Style**

Dai, C.; Liu, Z.; Wang, Y.; Lin, X.; Liu, H.; Zhou, B.
Design and Optimization of a New Type of Magnetic Suspension Vibration Absorber for Marine Engineering. *J. Mar. Sci. Eng.* **2023**, *11*, 2070.
https://doi.org/10.3390/jmse11112070

**AMA Style**

Dai C, Liu Z, Wang Y, Lin X, Liu H, Zhou B.
Design and Optimization of a New Type of Magnetic Suspension Vibration Absorber for Marine Engineering. *Journal of Marine Science and Engineering*. 2023; 11(11):2070.
https://doi.org/10.3390/jmse11112070

**Chicago/Turabian Style**

Dai, Changming, Zhengyuan Liu, Yu Wang, Xiang Lin, Hui Liu, and Bo Zhou.
2023. "Design and Optimization of a New Type of Magnetic Suspension Vibration Absorber for Marine Engineering" *Journal of Marine Science and Engineering* 11, no. 11: 2070.
https://doi.org/10.3390/jmse11112070