Design

philosophy

 

Our simulators use motion simulation techniques that have been well-known for many years. There exist many commercial platforms which can provide the physical cues that the 301 and 401 can (excepting the 401cr's continuous rotation).

So, why are they special?

Our hardware can deliver those cues with a much smaller hardware package at a much smaller price. The 301 and 401 driving experience has been compared favorably at trade shows with competing equipment weighing — and costing — ten times as much. Force Dynamics was able to provide this increase in performance by designing the platform specifically for its task, rather than adapting existing technology meant to move larger masses in a different way.

The second essential element of what we do at Force Dynamics involves the platform itself: How it performs, how it's built, and how those aspects of it differ from the competition.

Practicality

To provide any motion cues, the platform has to move. To accomplish this, three Force Dynamics-built ball-screw based linear actuators are driven by a networked 3-axis digital servo drive (In the case of the 401, a rotation wheel is chain-driven via a fourth servo motor). The actuator motors provide 3 hp peak and 500 lbs of peak thrust each; each actuator has 18" of travel. The trapezoidal strut shape, which is (imitations aside) unique in the industry, provides bracing, bridge-style, against the large lateral loads experienced during fast moves, allowing the machine to move faster and more reliably over time than can comparable machines with standard tubular struts.

Once the actuators move the platform, it has to move in a convincing and comfortable way. The platforms' raised center of rotation provides superior onset cueing compared to existing motion systems, and reduces parasitic forces that cause motion sickness. Informally observed, fewer than 1% of riders experience motion discomfort in the 301 and 401.

A secondary characteristic of the 'sunken seat' design is small size and ease of entry: Other platforms with a similar range of motion are nearly twice as tall, and require ladders or platforms for entrance and egress.

Performance

Now that the platform is moving in a convincing manner, it has to be in tune with the software simulation that provides the environment for the rider. In the 301, Ethernet-based servo system provides near instant reaction to in-game events, and allows for extremely high small-excursion bandwidth.

Rather than having the super-soft 'Magic Carpet' ride common with other small motion systems, our platforms can physically recreate engine vibrations, pavement texture, and high frequency suspension vibrations. This small 'texture' of the simulation is at least as important for rider experience as the overall feel of things. Imagine watching a badly-focused movie: You can tell what's happening, but it's not a very compelling experience. The quick response results in a tightly focused, immersive simulation.

Competing small systems from arcade manufacturers, based on hydraulics or slower servo drives, can take up to half a second to respond to input, and overshoot commanded positions, resulting in what is best described as a 'muddy' or distorted ride: the motion platform equivalent of speakers being played far too loudly. The 301 and 401 go where they're told immediately, and stop when they get there, resulting in a clear, clean, and engaging rider experience.

Capability

So, the platform is working well, but it needs to be told what to do. Force Dynamics' Windows-based control software requires only Ethernet (no add-on cards) and updates are available on-line. Its easy-to-use interface allows precise control of simulator characteristics, including scaling of output, softening filters, and per-game settings.

Additionally, our machines' open support API allows for the easy addition of software support; they're not dependent on one piece of soon-to-be-obsolete software. The ease with which additional software can be programmed to support the platform means that the system can simulate boats as easily as cars, planes as easily as boats, and large, heavily armed walking robots as easily as planes. While we're focused on driving simulation due to our personal passions (and resulting knowledge), our general knowledge of motion simulation and engineering allows us to work with experts in other areas to create compelling, realistic simulations beyond driving.

And this wraps back around to what our motion systems are, in one sentence:

The 301 and 401 are high fidelity, low-cost motion systems that bring the rider inside whatever simulation, game or training system is running by making the simulated forces and impacts real.

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