Development and In-Flight Evaluation of a Haptic Torque Protection

Müllhäuser, Mario; Leißling, Dirk

doi:10.4050/jahs.64.012003

Cited by 3 publications

(7 citation statements)

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“…As in a previous torque protection evaluation (Ref. 19), two different takeoff maneuvers were designed and used to evaluate the haptic torque protection and its different force patterns in flight and simulation: A vertical takeoff profile, named "whiteout escape" or mission profile (MP) 1 and a horizontal takeoff, named "fog departure" or MP2. The old whiteout escape profile was complemented by an additional flight phase, as explained hereafter.…”

Section: Methodsmentioning

confidence: 99%

“…21, that was identified and fitted based on real flight data by DLR and already used in previous evaluations (Ref. 19). It uses the collective position δ 0 , the pedal position δ p , as well as the true airspeed V TAS and the relation of current air density to reference air density ρ/ρ 0 to calculate the predicted Torque Q pred .…”

Section: Systemmentioning

confidence: 99%

“…A haptic torque protection system had been developed and evaluated in ground-based simulation and in flight with DLR's research helicopter ACT/FHS (Ref. 19). It used an active sidestick as a collective inceptor to generate a soft stop force feel pattern that appeared at the control position that was predicted to correspond with the current engine torque limit.…”

Section: Introductionmentioning

confidence: 99%

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US-german Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance: Shaker Versus Soft Stop

Müllhäuser¹,

Lusardi²

2022

j am helicopter soc

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The demonstration and testing of tactile cueing was the subject of a common research undertaking by the U.S. Army Combat Capabilities Development Command Aviation & Missile Center and the German Aerospace Center. The primary objective was to test a torque protection system with both a stick shaking cue generated with an attachable stick shaker and a soft stop cue generated by an active inceptor system. It was tested by five pilots in flight on the RASCAL JUH-60A helicopter and by four pilots in the ground-based simulator of the ACT/FHS (H-135) research helicopter based on a common set of high-performance takeoff mission profiles. The qualitative evaluation showed that the soft stop provided a greater workload reduction than the shaker and was the preferred cue. However, a shaker cue is a promising alternative when the application of an active inceptor system is not possible.

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Section: Methodsmentioning

confidence: 99%

Section: Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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US-german Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance: Shaker Versus Soft Stop

Müllhäuser¹,

Lusardi²

2022

j am helicopter soc

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“…Here the torque model consists of a simple second order polynomial (1), as described by [21], that was identified and fitted based on real flight data by DLR and already used in previous evaluations [19]. It was also adapted for this effort 1 contains the identified torque model values for both, ACT/FHS and RASCAL.…”

Section: Systemmentioning

confidence: 99%

“…A haptic torque protection system had been developed and evaluated in ground-based simulation and in flight with DLR's research helicopter ACT/FHS [19]. It used an active sidestick as a collective inceptor to generate a soft stop force feel pattern that appeared at the control position that was predicted to correspond with the current engine torque limit.…”

Section: Introductionmentioning

confidence: 99%

US-German Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance - Shaker vs. Soft Stop

Müllhäuser¹,

Lusardi²

2020

Proceedings of the Vertical Flight Society 76th Annual Forum

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The demonstration and testing of tactile cueing is the subject of a common research undertaking by the U.S. Army Combat Capabilities Development Command Aviation & Missile Center (CCDC AvMC) and the German Aerospace Center (DLR). The primary objective was to test a torque protection system with both a stick shaking cue generated with an attachable stick shaker and a soft stop cue generated by an active inceptor system. It was tested by five pilots in flight on the RASCAL JUH-60A helicopter and by four pilots in the ground-based simulator of the ACT/FHS (H-135) research helicopter based on a common set of high performance takeoff mission profiles. The qualitative evaluation showed that the soft stop provided a greater workload reduction than the shaker and was the preferred cue. However, a shaker cue is a promising alternative when the application of an active inceptor system is not possible.

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Design of a haptic obstacle avoidance for low-speed helicopter operations using active sidesticks

Walko

Müllhäuser

2023

Aeronaut. j.

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Helicopter collisions with obstacles are one of the most frequent and most devastating causes of accidents. To avoid these collisions in low-speed operations a “haptic ticker” cue in form of repetitive impulses as a force feedback was designed for an active sidestick. Various design questions were examined in pilot campaigns using a full flight simulator and four test scenarios. As a result, the pilots always knew which distance-based hazard area (green, yellow, red) they were in. Furthermore, the ticker is disruptive and roughly reduces the handling qualities from Level 1 to Level 2. It is therefore primarily activated as a hazard warning and not as a main input to control the distance. As a warning cue the ticker was evaluated as non-disturbing. The force threshold to detect the direction of a tick was determined. With tick strengths above this threshold, the direction is still not recognised at all in around 2% of the ticks. For the remaining ticks, the accuracy with which the direction is recognised is about 15°. In the fourth scenario, obstacles were moved towards the hovering helicopter, potentially forcing a collision. However, with the ticker a collision occurred in less than 4% of the cases, instead of 84% without the ticker. The ticker was rated as very intuitive and worth recommending. When asked how many accidents of this kind could be prevented with this ticker, all five pilots independently estimated 75%.

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Development and In-Flight Evaluation of a Haptic Torque Protection

Cited by 3 publications

References 0 publications

US-german Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance: Shaker Versus Soft Stop

US-german Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance: Shaker Versus Soft Stop

US-German Joint In-flight and Simulator Evaluation of Collective Tactile Cueing for Torque Limit Avoidance - Shaker vs. Soft Stop

Design of a haptic obstacle avoidance for low-speed helicopter operations using active sidesticks

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