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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchNot yet as a demonstrated result. Heaving oscillators are a proposed way to convert a ship’s motion in waves into onboard electricity, which might help reduce the energy a vessel must supply from fuel. Published work describes and models the system, but does not show that a commercial ship has gained range or saved fuel with it.
How an inboard heaving oscillator would make electricity
The concept adapts a two-body point absorber for installation inside a ship. The vessel acts as the moving platform; a separate oscillator moves relative to it as the ship responds to waves. A power take-off (PTO) converts that relative motion into electrical energy.
The proposed inboard PTO includes a frame, oscillator, spring, hydraulic cylinder and pipes. In principle, the oscillator’s relative stroke gives the PTO motion to harvest. The arrangement is intended to capture wave-related motion without putting the converter outside the hull.
A 2026 study describes avoiding changes to the hull’s external geometry as a design rationale. That does not establish that the system is easy to retrofit, fits every ship, or can deliver useful net power after conversion losses.
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What the published studies have modeled
The evidence consists of research models, validation against experimental data and parametric analysis—not a full-scale commercial-vessel demonstration. The two studies examine different modeling conditions:
| Study | Vessel and sea conditions | What it reports |
|---|---|---|
| Liu and co-authors, 2023 | Coupled ship-and-oscillator model in regular waves, developed using a boundary-element method. | Reports favorable agreement between numerical results and publicly available experimental data. Examines forward speed, wave encounter angle, PTO mechanical settings, ship and oscillator motions, energy capture and internal loads. |
| Guo, Liu, Yeung and Zhang, 2026 | Time-domain model of an internally mounted oscillator in a KRISO Container Ship (KCS) model; analyzes regular and irregular seas. The irregular conditions represent the South China Sea along the Hong Kong–Singapore route. | Reports validation against experimental ship-motion data and analyzes the effects of sea conditions, speed and PTO settings. |
Liu and co-authors report that the concept has no significant adverse effect on modeled seakeeping performance. This finding applies to the configurations and assumptions they studied; it does not establish that an installed system would have no effect on every vessel.
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Why speed, wave direction and PTO settings matter
A ship’s forward motion changes how waves meet the vessel, so the motion available to the oscillator depends on both the sea and the ship’s heading and speed. In the 2026 KCS model, at a reported service speed of 24 knots, the capture optimum shifts toward head and near-beam seas. That is a condition in that study, not a general shipping statistic or a proven operating target for other ships.
The modeled results also depend on the PTO’s damping and stiffness. These settings affect the coupled response of the vessel and oscillator, and therefore the modeled energy capture. The studies examine these relationships; they do not establish one set of settings that would be optimal across ships and voyages.
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What “extend shipping range” means—and what is not established
If a ship could reliably harvest useful wave energy and turn it into onboard electricity, that power might offset some energy otherwise supplied by the ship’s conventional systems. Whether this would reduce fuel use enough to extend a voyage’s range would depend on delivered net power, the ship’s energy demand and operating conditions. The mechanism makes the possibility intelligible, but the reviewed studies do not demonstrate the outcome.
- They do not report measured full-scale onboard net power or voyage fuel savings.
- They do not document a commercial vessel gaining range with the system.
- They do not establish lifecycle cost, operating availability or maintenance experience.
A persuasive operational result would need a documented full-scale or representative-sea trial reporting electricity delivered after PTO and conversion losses, mechanical loads, availability, added mass and maintenance. A voyage comparison would also need matched route, speed and sea conditions to assess any fuel or range benefit fairly.
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How to assess the concept against other onboard-energy options
For this proposal, the useful comparison is not simply how much motion a model captures. It is whether a system can turn that motion into dependable, net electrical energy without unacceptable effects on the ship or its operation. Compare options on these points:
Quick Recap
- Installation: Is the converter internal, or does it alter external hull geometry? Avoiding an external change is a stated rationale for this design, not evidence that installation is straightforward.
- Conditions studied: Which vessel, speeds, wave directions and sea states were modeled? The published results here include regular waves and, in the 2026 study, representative irregular conditions.
- PTO assumptions: What damping, stiffness and other mechanical settings are assumed, and how sensitive is performance to them?
- Evidence type: Is the result modeled energy capture, or measured electricity delivered aboard a vessel after conversion losses?
- Ship effects and operation: Are seakeeping and mechanical loads assessed, and are full-scale fuel use, range, availability and maintenance reported?
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