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Enhanced Epsilon Rocket” Enhanced Epsilon Rocket Responding to Needs for Small Satellite Launch Recent Increasing Expectations About Small Satellites

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Enhanced Epsilon Rocket” Enhanced Epsilon Rocket Responding to Needs for Small Satellite Launch Recent Increasing Expectations About Small Satellites IHI AEROSPACE Co., Ltd. Compact but Powerful “Enhanced Epsilon Rocket” Enhanced Epsilon rocket responding to needs for small satellite launch Recent increasing expectations about small satellites. In order to respond to the expectations, the launch capability of an Epsilon rocket has been improved by 30%. This report will introduce IA’s technologies flexibly responding to launching small satellites and value provided by Epsilon rockets. Enhanced Epsilon rocket: Liftoff ©JAXA Appearance of enhanced Epsilon rocket ©JAXA Enhanced Epsilon rocket reliability was highly evaluated. The purpose of developing the enhanced Epsilon rocket is The first Epsilon rocket developed by IHI AEROSPACE Co., to enlarge a payload usable volume of a satellite and to Ltd. (IA) under the supervision of National Research and improve a launch capability in order to respond to the needs Development Agency, Japan Aerospace Exploration Agency for satellites. The demand for launching small satellites, such (JAXA) was launched in September, 2013, and the mission as the geospace probe “ARASE” (ERG: Exploration of of placing the spectroscopic planet observatory satellite energization and Radiation in Geospace) launched by “HISAKI” in orbit was achieved. Epsilon-2 and the earth observatory satellite “ASNARO-2” Subsequently, after approximately 3-year improvement and launched by Epsilon-3, is increasing. In order to respond to development, we succeeded in launching Epsilon-2 in the demand, it was necessary to enlarge the payload usable December, 2016. The Epsilon rocket installed with a solid volume and improve the launch capability while reducing rocket booster (SRB-A) in the underlying first stage and both the cost and period of development. inheriting DNA from the M-V rocket including all solid There were almost three main improvements performed on rocket stages is being evolved in line with the times. Note the launch vehicle. that SRB-A was also used for the H-IIA/B rocket and its 4 Vol. 51 No. 2 2018 Products Avionics Post boost stage (optional) Third solid motor stage Second solid motor stage First solid motor stage Fairing Separation mechanism Item Specification Total length 26 m Diameter 2.6 m Gross weight 96 ton SSO (500 × 500 km) : 590 kg or more (Optional configuration) Launch capability Extended elliptical (200 × 30 000 km) : 365 kg or more (Basic configuration) Configuration diagram of enhanced Epsilon rocket ©JAXA Increase in size of 2nd stage motor since the last development of a large motor. On the basis of lots of the past manufacturing results achieved by IA, we To increase the launch capability, it is necessary to increase reviewed the safety factor of the CFRP pressure vessel to the size of a motor. First, we increased the amount of reduce the weight while keeping high reliability. Also, a propellant of the second stage motor up to 1.4 times. In order further reduction in weight was achieved by employing a to suppress an increase in weight due to the expand in size of multifunctional heat resistant rubber material prepared by the motor, we reviewed materials and parts configuration to forming the three-layer of rubber into one layer. This further improve performance. Indeed, it had been 14 years multifunctional rubber was developed by IA. Enlargement of satellite payload Fairing usage volume (No change, Lower part raised) Fairing 2nd stage motor 2nd stage motor (Inside of fairing) (Outside of fairing) 1st stage motor Epsilon-1 Epsilon-2 Enhancement of launch capability Launch capability Epsilon-1 Epsilon-2 SSO 450 kg 590 kg Satellite payload usage volume 4.7 m 5.4 m Epsilon-1 Epsilon-2 Overview of improvements of enhanced Epsilon rocket Vol. 51 No. 2 2018 5 IHI AEROSPACE Co., Ltd. Past: Layer-by-layer lamination Present: Integrated lamination/Folding Aluminum honeycomb core CFRP CFRP CFRP Only winding each sheet around cylindrical jig + CFRP sheet + Film adhesive sheet + Aluminum honeycomb core + Film adhesive sheet + CFRP sheet Combustion test of 2nd stage motor ©JAXA Large composite material structure (B1PL) This development allowed a payload for an earth Light-weight composite material structure observatory satellite with strong needs, such as ASNARO-2 launched by Epsilon-3, to be improved by 30%, i.e., from Composite material structure was employed for the lower 450 kg to 590 kg. This made it possible to increase the structures to reduce weight in association with the increase in weight of the satellite loaded in Epsilon-2 to 365 kg. Since motor diameter due to the increase in size of the second stage the payload of Epsilon-1 for carrying the satellite was motor. 300 kg, performance was enhanced so that a satellite heavier The employment of the light-weight composite material by 65 kg was mountable. structure, which is in the field of expertise where IHI and IA Also, the second stage motor installed inside the fairing of had collaborated with each other for aircraft engines, was Epsilon-1 was increased in diameter and therefore moved also intended to enhance performance, reduce cost, and take outside and upward, maintaining the specification of the preparatory steps for the future. We developed a low-cost fairing, and thereby the length of a payload usable volume process structure made of a CFRP material (a process was was increased by 0.7 m compared with Epsilon-1. simplified by changing from conventional hand wrapping The improvement of the launch capability and the lamination to integrated lamination and wrapping a metallic expansion of the payload usable volume associated with the honeycomb together with a CFRP sheet) for the 1/2 inter- increase in size of the second stage motor realized the stage structure. In doing so, both high performance and low world’s top-level enhanced Epsilon rocket. cost were achieved for the CFRP structure, which had been Reduction in size and weight of avionics relatively expensive. Thus, the scientific exploration satellite ERG was launched To improve the launch capability, it is effective to reduce the on December 20, 2016. The satellite was successfully weight of the whole Epsilon rocket. For this purpose, we also launched on time at the scheduled date. Also, a vibration worked on a reduction in size of avionics (electronic environment indicating the ride quality of the satellite and equipment loaded into aircrafts and rockets and controlling injection accuracy into an orbit exhibited the good result that flights). By replacing mechanical relays with a Power both satisfied corresponding ranges required by the satellite. Sequence Distribution Box (PSDB) and applying Value provided by Epsilon rocket semiconductor switches for the first time in Japan, the weight of the avionics was reduced to approximately half and In order to send the high-performance small radar satellite thereby the launch capability was improved. ASNARO-2 into the space, Epsilon-3 was launched in Although nowadays everyone thinks that using January, 2018. As with Epsilon-1, Epsilon-3 mounted with the semiconductor switches to reduce size is common, a liquid stage PBS is expected to be more highly accurately reduction in size is not easy for space equipment. The failure launched. ASNARO-2 is a small earth observatory satellite, of a semiconductor device due to space radiations and which is mounted with a high-resolution synthetic aperture malfunction due to noise must be absolutely avoided. Only radar (SAR) and was developed by the Ministry of Economy, because of IA having the know-how on what kind of load test Trade and Industry. The emerging space nations also highly should be cleared in order to use space equipment under desire to own this sort of high-performance earth observatory space environment and knowing how to accumulate test data, satellite. Accordingly, ASNARO-2 also served as a touchstone the reduction in size of the space equipment was achieved. for launching future commercial satellites, and we are The PSDB with high radiation resistance was developed in currently running PR campaigns in Asian and other emerging collaboration with MEISEI ELECTRIC CO., LTD. of the IHI nations together with the satellite manufacturer. Under such group. circumstances, IA frequently adjusted the interface with the satellite site, and got involved in satellite support work including operation at the rocket range more than ever. 6 Vol. 51 No. 2 2018 Products Sine wave oscillation environment Epsilon-1 (Example of another rocket: 0.6 G) 1.0 140 : Ariane 5 (O.A.140.5 dB) 0.8 : ASAP 5 (O.A.142.0 dB) 135 : Falcon1 (O.A.132.6 dB) 0.6 : Minotaur1 (O.A.140.0 dB) 0.4 130 : Delta II (O.A.138.9 dB) 0.2 125 : LM-3C (O.A.141.0 dB) 0.0 : Rockot (O.A.137.9 dB) 120 : Soyuz (O.A.141.0 dB) −0.2 : VEGA (O.A.138.5 dB) −0.4 115 - Epsilon-1 : 0.2 G Epsilon-1 : Taurus 63" (O.A.131.9 dB) Flight results : Landlaunch (O.A.139.6 dB) Epsilon-2 110 Epsilon-2 - Epsilon-2 : 0.3 G of Epsilon : Sealaunch (O.A.141.6 dB) 0.5 105 1/1 octave-band SPL (dB) : H-IIA (O.A.137.5 dB) : H-IIB (O.A.142.7 dB) 0.0 100 : M-V (O.A.143.1 dB) 10 100 1 000 10 000 −0.5 : Falcon9 (O.A.139.6 dB) Frequency (Hz) : Epsilon Flight (O.A.131.7 dB) < Sine wave oscillation environment > < Acoustic environment > : Epsilon Design (O.A.140.0 dB) Flight results of enhanced Epsilon rocket An Epsilon rocket is currently being developed so as to be capable of mounting nanosatellite (CubeSat) and small Multiple satellites satellite, which have been extensively and intensively loading structure developed by some organizations such as space ventures, universities, and research institutes.
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