Study on passive momentum exchange landing gear using two-dimensional analysis

Watanabe, Tomonori; Hara, Susumu; Otsuki, Masatsugu

doi:10.1016/j.actaastro.2014.10.020

Cited by 14 publications

(7 citation statements)

References 6 publications

(11 reference statements)

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“…Gambar 1. Metoda benturan 3 bola berdasarkan teori ayunan newton [12] Metoda MEID seperti yang digambarkan oleh gambar 2 dianggap mampu mereduksi akselerasi maksimum pada vibrasi [13] dan dapat diaplikasikan pada benda seperti mesin tempah dan roda pendaratan pada pesawat terbang [13]. Pada sistem PMEID, perpindahaan energi maksimum dari massa utama kepada massa peredam memiliki durasi yang sama dengan benturan dari massa damper ke massa utama [13].…”

Section: Pendahuluanunclassified

Perancangan Sensor Gerak Benda pada Benturan Berlebihan untuk Pengujian Pre-Straining Spring Momentum Exchange Impact Dumper (PSMEID) Dengan Metoda Prediksi Waktu Benturan (Preview)

Darmawan

Lovelyson

Pharmayeni

2020

JNTE

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Getaran yang terjadi diakibatkan oleh benturan yang berlebihan (Excessive Impact) dapat merusak kontruksi sebuah benda. Excessive Impact yang biasanya terjadi pada waktu tertentu saja seperti benturan roda pendaratan pesawat dengan landasan pacu yang dapat berakibat fatal jika getaran yang dihasilkan tidak dapat dikontrol dengan baik. Penelitian ini mencoba merancang simulasi sebuah system peredaman untuk mereduksi getaran yang terjadi akibat dari Excessive Impact. Metoda yang dikembangkan disebut sebagai PSMEID (Pre-Straining Momentum Exchange Impact Dumper), dimana dalam hal ini memanfaat momentum dari sebuah masa yang ditempatkan pada masa utama yang arah gayanya berlawanan dengan gaya yang dihasilkan oleh benturan dari Excessive impact. Pada penelitian ini akan dilakukan dengan mensimulasikan Excessive impact dengan cara memprediksi waktu benturan sehingga waktu pelepasan massa dengan dorongan pegas yang sudah diregangkan (pre-straining) dengan arah yang berlawanan dari arah benturan memberikan hasil yang lebih optimal untuk mereduksi getaran dari benturan yang terjadi. Dengan peracangan sensor vibrasi dan gerak maka didapat waktu tercepat solenoid mengaktifkan PSMEID adalah 32 milisecon.

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Section: Pendahuluanunclassified

Perancangan Sensor Gerak Benda pada Benturan Berlebihan untuk Pengujian Pre-Straining Spring Momentum Exchange Impact Dumper (PSMEID) Dengan Metoda Prediksi Waktu Benturan (Preview)

Darmawan

Lovelyson

Pharmayeni

2020

JNTE

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“…22 In addition, the relative ease in establishing and analyzing the mathematical model describing two-dimensional landing dynamics of the probe plays an important role in the study of forces and motion under critical conditions. 23,24 The planar experiment can be adopted to verify the two-dimensional theoretical results. At present, the planarization of probes with the legged LCM aims at the four-legged probes and it is based on the 2-2 landing scenario, in which two adjacent cushioning legs simultaneously touch the ground first and are followed by the other two cushioning legs.…”

Section: Introductionmentioning

confidence: 99%

Experimental method for the planar landing of a three-legged asteroid probe: The effects of asymmetric configuration and element forces

Yin

Quan

Tang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Focused on an asteroid probe with three-legged cushioning, this paper discusses the effects of the asymmetric configuration and the element forces form of the planarized cushioning mechanism on the method for developing the landing experiment. The main objectives are to present an accurate experimental analysis of the planar landing and to facilitate the construction of a micro-gravity experimental platform through the theoretical analysis in advance. Probe models based on the planar symmetric and asymmetric configurations of the cushioning mechanism were constructed and their parametric characterization was determined. Mathematical models of the element forces on cushioning legs were established and differences between each set of corresponding element forces were analyzed. Then, dynamics models explaining the landing process were established. On this basis, the maximum initial safe attitude angle and the change process of the attitude variables were researched. The results revealed that the asymmetric configuration greatly reduced the safety margin of the attitude angle and it was determined by the M-R(I) landing as 23°. In addition, the simplified version of the ground friction force could be employed for developing the experiment at the initial attitude angle of 20°, but it affected the results at the initial attitude angles of 0°, 5°, and 10°. At the initial attitude angle of 20°, which is more significant as the critical condition for dangerous landing, the normal footpad-ground contact of the merged leg could adopt the same stiffness coefficient as that of the real leg to facilitate the experimental design without affecting the experimental results.

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“…Finally, the effect of the soil itself is generally nontrivial to model [17][18][19][20]; it can be simulated using numerical methods [17] or experimentally. The physics of impact and energy dissipation during collisions and landing have been studied from a structural point of view [21][22][23], from a dynamics perspective [1,2,10,16,[23][24][25], and as a mission-planning problem [11,26].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, landing systems for space probes are designed to be used only once [21][22][23]26]; an interesting example is that of Saeki, who proposed a landing gear based on a spring that, when fully compressed, is released, thus dissipating the landing energy [33]. On the other hand, the need for reusable landing systems can be found in some proposals, e.g., vertical take-off and landing systems (VTOL) vehicles [34], suspension system for rovers [24], and several others [25,35]. Reusability is especially important for the concept of hoppers [36][37][38], vehicles able to repeatedly land and takeoff from the surface of a planet.…”

Section: Introductionmentioning

confidence: 99%

A New Mechanism for Soft Landing in Robotic Space Exploration

Seriani

2019

Robotics

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Landing safely is the key to successful exploration of the solar system; the mitigation of the connected effects of collision in mechanical systems relies on the conversion of kinetic energy into heat or potential energy. An effective landing-system design should minimize the acceleration acting on the payload. In this paper, we focus on the application of a special class of nonlinear preloaded mechanisms, which take advantage of a variable radius drum (VRD) to produce a constant reactive force during deceleration. Static and dynamic models of the mechanism are presented. Numerical results show that the system allows for very efficient kinetic energy accumulation during impact, approaching the theoretical limit.

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Study on passive momentum exchange landing gear using two-dimensional analysis

Cited by 14 publications

References 6 publications

Perancangan Sensor Gerak Benda pada Benturan Berlebihan untuk Pengujian Pre-Straining Spring Momentum Exchange Impact Dumper (PSMEID) Dengan Metoda Prediksi Waktu Benturan (Preview)

Perancangan Sensor Gerak Benda pada Benturan Berlebihan untuk Pengujian Pre-Straining Spring Momentum Exchange Impact Dumper (PSMEID) Dengan Metoda Prediksi Waktu Benturan (Preview)

Experimental method for the planar landing of a three-legged asteroid probe: The effects of asymmetric configuration and element forces

A New Mechanism for Soft Landing in Robotic Space Exploration

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