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Vol.51 No.2

IHI ENGINEERING REVIEW

Vol.51 No.2

 
 

1. Products

Products1

IHI AEROSPACE Co., Ltd.

In 2016, the Exploration of energization and Radiation in Geospace “ARASE” (ERG) was launched into space, and is now challenging observation in the Van Allen belt first in the world. What launched “ARASE” and successfully placed it in orbit is Epsilon-2 developed by JAXA and IA.

Products2

IHI AEROSPACE Co., Ltd.

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.

Products3

IHI AEROSPACE Co., Ltd.

Mechanical switches are safe but large and heavy. Semiconductor switches are capable of reducing size and weight but cause anxiety about malfunction. The IHI group solved such a problem to obtain small-sized lightweight avionics by applying the know-how in evaluation of space equipment.

Products4

IHI Inspection & Instrumentation Co., Ltd.

When observing a combustion phenomenon on the earth, fuel droplets are small and the phenomenon (reaction) is fast, so detailed observation is difficult. On the other hand, when performing experiments in space, the effect of gravity is very small, and correspondingly fuel droplets can be increased in size, thus enabling scaled-up detailed observation. In light of this, we developed a combustion experimental apparatus for space experiments.

 
 

2. Technologies

Technologies1

IHI Corporation

A methane engine is promising as an engine for reusable launch vehicles and in-space transportation systems, and research and development activities thereof has been started in the world. Ahead of recent those activities, IHI has developed a prototype methane engine and performed its hot firing tests, and is continuing the research and development effort for the engine to production version, as well as new technologies required for future long-term operations in space.

Technologies2

IHI Corporation

Additive manufacturing is rapidly advancing in technology and often heard on the news in recent years. Using this technology capable of making metal components of any shape in a sense, IHI will innovate the method for manufacturing rocket engines, one of the most hard-to-realize industrial products.

Technologies3

IHI AEROSPACE Co., Ltd.

As a thruster for very small satellites, we will provide users with a propulsion system whose manufacturing cost is reduced by using a 3D printer and life cycle cost from manufacturing to operation is suppressed by using a low-toxic safe propellant.

 
 

3. Curiosities

Curiosities1

IHI Corporation

IHI covering a wide range of business areas can contribute to solving problems in various fields using data acquired by satellites in space. This report introduces applications for using satellite AIS (Automatic Identification System) messages currently focused on as new data.

Curiosities2

IHI AEROSPACE Co., Ltd.

IHI AEROSPACE Co., Ltd. is considering the business of propellant supply and equipment replacement services for on-orbit satellites, using robotics control technology in addition to long-proven space business, i.e., mechanical and propulsion systems.

Curiosities3

IHI AEROSPACE Co., Ltd.

A Hall thruster is a sort of electric propulsion device used in a satellite. Electric propulsion devices had been used previously for only station keeping in geostationary orbit, and for orbit raising, chemical propulsion devices have been used. The global trend developing all-electric satellites which use only Hall thrusters is now accelerating.

 
 

4. Technical Papers

Technical Papers1

YANAGISAWA Masahiro, KISHI Koichi, NAGAO Toru

Recently, low cost launch vehicles intended for large commercial satellites are being developed actively all over the world, including Ariane 6 by Arianspace (Europe), Falcon 9 and Falcon Heavy by SpaceX (USA), a company led by Elon Musk, Vulcan by ULA (USA) and by Russian and Indian companies. Moreover, Japan is also developing the next flagship launch vehicle called H3. This paper introduces H3 and its strap-on booster “SRB-3.”

Technical Papers2

MIZUNO Tsutomu, OGUCHI Hideo, NIIYAMA Kazuki, SHIMIYA Noriyuki

LE-9 is a new cryogenic booster engine with high performance, high reliability, and low cost, which is designed for H3 Rocket. It will be the first booster engine in the world with an expander bleed cycle. In the designing process, the performance requirements of the turbopump and other components can be concurrently evaluated by the mathematical model of the total engine system including evaluation with the simulated performance characteristic model of turbopump. This paper reports the design requirements of the LE-9 turbopump and their latest development status.

Technical Papers3

FUKUMOTO Shintaro, NISHIDO Takayuki, ARAKAWA Takahiro, OMORI Mami, OMORI Seiichi

We have been studying damage evaluation methods during the hydraulic test of the thin-walled CFRP pressure vessel using three-dimensional source location (3D source location). In this study, we conducted 3D source location using water propagation waves when the CFRP pressure vessel was damaged. Also, we evaluated the separation tendency of surface propagation waves and water propagation waves, thereby confirming the Kaiser effect. In order to improve the precision of 3D source location using water propagating waves, we demonstrated a new method, “Area locating.” The results thereof confirmed that 3D source location using “Area locating” was consistent with fracture phenomenon. In addition, the new method was able to identify the origin of the fracture.

Technical Papers4

KUBO Seiji, TOMARU Hiroshi

Rocket turbopumps that are required to have a high degree of reliability are composed of turbines, impellers, bearings, etc. In a multidisciplinary optimal design process of such a complicated rotating system, the shape optimization of each component is addressed to stabilize the dynamic behavior of a rotating system after a design of the component array. In this paper, the shape optimization method based on the response surface incorporating with the magnitude of distribution is proposed. As for estimating the influence of error factors in terms of rotor dynamics, the standard deviation is introduced. As a numerical example, a multidisciplinary optimization of rocket turbopump is presented to verify the utility of our proposed method.

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