{"id":21826,"date":"2026-09-29T10:34:01","date_gmt":"2026-09-29T10:34:01","guid":{"rendered":"https:\/\/pfi-germany.de\/?p=21826"},"modified":"2026-09-30T10:07:31","modified_gmt":"2026-09-30T10:07:31","slug":"schrittsimulator","status":"publish","type":"post","link":"https:\/\/pfi-germany.de\/en\/schrittsimulator\/","title":{"rendered":"The gait simulator: When the testing machine walks like a human"},"content":{"rendered":"
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A shoe has to withstand a great deal in everyday life: the heel striking the ground thousands of times, the foot rolling forward, and the push-off from the forefoot \u2013 step by step, day after day. To ensure that we not only understand this strain but can also replicate it precisely in the laboratory, we have developed the gait simulator \u2013 a testing machine that mechanically replicates the human gait and puts shoes through their paces with a level of realism that few other methods can match.<\/p>\n\n\n\n

As a testing and research institute for the footwear and leather industry, we have been working for decades on the question of how the quality and durability of footwear can be assessed objectively and transparently. Drawing on this long-standing experience, we have developed the gait simulator: an in-house innovation that provides our clients in the industry with an additional testing method that closely mirrors real-life conditions.<\/p>\n\n\n\n

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The test shoe is mounted on a custom-shaped plastic foot inside the test chamber of the gait simulator.<\/em><\/figcaption><\/figure>\n\n\n\n

The human gait as a model<\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

When walking, the weight is not distributed evenly across the foot, but follows a rhythm all of its own: as the heel strikes the ground, the force shoots steeply upwards; it drops briefly as the body rolls over the supporting leg; and then rises a second time as the foot pushes off the ground via the forefoot and toes. This characteristic up-down-up pattern \u2013 also known as a \u2018double peak\u2019 in gait analysis \u2013 reaches peak values of around 110 per cent of body weight at a normal walking pace, with a brief trough at around 80 per cent in between. When walking at a brisk pace or running, these force peaks are significantly higher. It is precisely this pattern that should serve as the benchmark for any realistic shoe test.<\/p>\n\n\n\n

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Schematic representation of the typical vertical ground reaction force during human walking: two force peaks (heel strike, forefoot strike), separated by a trough in the mid-stance phase.<\/figcaption><\/figure>\n\n\n\n

This is how the walking simulator replicates this rhythm<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

Our gait simulator features two independent test chambers, one for the left shoe and one for the right. A specially developed drive and control system ensures that the test specimen is subjected to exactly the same load at every stage of a step as a real foot would be when walking \u2013 from the transfer of weight upon heel strike to the powerful push-off via the forefoot.<\/p>\n\n\n\n

During the test, force sensors continuously record the forces actually acting on the shoe and display the data in real time as a force-time curve. The result is astonishingly close to the actual gait curve: the software clearly shows two force peaks, separated by a brief trough \u2013 the mechanical fingerprint of a human step.<\/p>\n\n\n\n

The system does not merely simulate a leisurely walk: the level and progression of the load can be specifically adjusted so that even brisk walking or running \u2013 with the correspondingly higher force peaks \u2013 can be replicated. And because, in real life, a shoe has to withstand not just one but millions of steps, the step simulator is designed for robust continuous operation: it carries out tests reliably and with consistent accuracy over a very large number of load cycles.<\/p>\n\n\n\n

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A direct comparison of the force curves (black\/cyan) recorded by the gait simulator with the schematic gait curve above: the same double-peaked profile with a first force peak, a relief trough and a second force peak<\/em><\/figcaption><\/figure>\n\n\n\n

A comparison of the two curves highlights what makes the gait simulator so special: it does not merely apply a single, static load, but precisely reproduces the same pattern \u2013 an initial increase in force, a brief period of relief, followed by a second increase in force \u2013 that a human foot also generates whilst walking. It is precisely this correspondence in the temporal progression \u2013 not just in the magnitude of the load \u2013 that distinguishes our test method from conventional, one-dimensional compression or bending tests.<\/p>\n\n\n\n

Why realistic testing makes all the difference<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

Whether it\u2019s a work shoe, a sports shoe or an everyday shoe: ultimately, one thing matters most to wearers \u2013 that the shoe continues to perform reliably even after many thousands of steps. Traditional laboratory tests, which apply only a single, constant force, do not fully replicate these everyday conditions. If the test result deviates too far from real-world wear and tear, weaknesses may only become apparent to the end customer \u2013 with noticeable consequences for the complaints rate, the cost of rectification and, not least, confidence in a brand.<\/p>\n\n\n\n

A test method that replicates the actual stress profile of a step fills precisely this gap. Weaknesses in the material or design thus become apparent in the laboratory before a product goes into mass production or a quality mark is awarded. For us as a testing institute, this is a key priority: to deliver results that genuinely reflect how a shoe behaves in real-world use \u2013 not just under laboratory conditions.<\/p>\n\n\n\n

How manufacturers can use the step simulator<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h2>\n\n\n\n

For footwear manufacturers and suppliers, this testing method opens up some very practical possibilities: when developing new sole materials or designs, it allows early identification of how a prototype behaves under walking loads similar to those encountered in everyday life \u2013 long before expensive field tests involving test subjects are required. In ongoing mass production, the system is used for quality assurance, for example to check whether different production batches maintain a consistent level of durability. And when comparing different shoe models or material variants, the gait simulator provides objective, reproducible performance metrics that can be compared with one another over long periods and across many test runs.<\/p>\n\n\n\n

Precisely because the system simulates the entire load cycle of a step \u2013 rather than just a single test point \u2013 it complements traditional standardised tests by providing an additional, real-world perspective \u2013 an added value that translates into more robust development and quality decisions.<\/p>\n\n\n\n

Overview<\/strong><\/strong><\/h2>\n\n\n\n