Recent Advances in Quasi-Zero Stiffness Vibration Isolation Systems: An Overview and Future Possibilities

Round 1

Reviewer 1 Report

This paper presents a review on Quasi‐Zero Stiffness (QZS) vibration isolation systems.

The paper is interesting and well written.

However, the authors should go deeper in the literature review, as some more recent papers are missing  on how achieving QZS effect by combining positive and negative stiffness.

Out of the 147 references there are only 2 papers cited which were published in 2022, and 22 references from 2021.

Most of the papers is too out of date, and although a proper acknowledgment should be given, as for the fundamental issue, those should be limited respect to the most recent literature. Indeed the paper is titled “Recent Advances in …”

The paper should then be improved by taking into account the following points.

 

1.

Some more emphasis should be then given to:

a. general QZS advantages and bio-inspired structures, see for example:

- Design, Experiment, and Improvement of a Quasi-Zero-Stiffness Vibration Isolation System, http://dx.doi.org/10.3390/app10072273

- Bio-Inspired Vibration Isolation: Methodology and Design, https://doi.org/10.1115/1.4049946

 

b. application of QZS to protection systems, see for example:

- Vibration protection system with nonlinear elastic and damping characteristics, https://doi.org/10.1088/1742-6596/1791/1/012015

 

c. customization of nonlinear force-displacement curves, see for example:

- A device capable of customizing nonlinear forces for vibration energy harvesting, vibration isolation, and nonlinear energy sink, https://doi.org/10.1016/j.ymssp.2020.107101

- An adjustable device to adaptively realise diverse nonlinear  force-displacement characteristics, https://doi.org/10.1016/j.ymssp.2022.109379

 

d. X-shaped and K-shaped structures with linkages and springs, see for example:

-   Vibration isolation properties of the nonlinear X‒combined structure with a high-static and low-dynamic stiffness: Theory and experiment , https://doi.org/10.1016/j.ymssp.2022.109352

- Optimizing elastic potential energy via geometric nonlinear stiffness, https://doi.org/10.1016/j.cnsns.2021.106035

- The X-structure/mechanism approach to beneficial nonlinear design in engineering, https://doi.org/10.1007/s10483-022-2862-6

 

e. QZS systems using only two springs, see for example:

- On the detailed design of a quasi-zero stiffness device to assist in the realisation of a translational Lanchester damper, https://doi.org/10.1016/j.ymssp.2021.108258

- Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure, https://doi.org/10.1016/j.ymssp.2020.107354

 

2.

The section regarding active and semi/active devices is too short compared to the passive devices. This should be motivated or integrated with some deeper literature review.

 

3.

When nonlinear systems are considered, displacement transmissibility is different from force transmissibility. This should be better disclosed by the authors.

 

4.

I believe section 6 should be named “Conclusions”

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

This work is a comprehensive review on the recent research on quasi-zero stiffness vibration isolators with a focus on the principle, structural design and vibration isolation performance of various types of QZS vibration isolators either passive or active/semi-active.

It is a well-structured review paper that contains the most important publications on the subject. It is useful to new researchers on the field but maybe you should consider using larger images in the Figures. Furthermore you should consider not dividing it into two subsections the Results section.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The authors have modified the paper according to the reviewer's comments. The manuscript has been improved and can be accepted for publication.