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RISS 인기검색어
- 검색키워드
- 저자 : ( Naoki Hiruta ) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Vibration control of membrane structures using multiple dielectric elastomer actuators
Toshiki Hiruta,Hiroki Ishihara,Naoki Hosoya,Shingo Maeda,Itsuro Kajiwara 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
A vibration suppression technique for lightweight and flexible membrane structures is proposed using smart structure technology with a dielectric elastomer actuator (DEA). DEA is a lightweight flexible polynomial material with a large deformation and high response time. Its advantages include easy application to the membrane structures and vibration suppression over a wide frequency band. A non-contact excitation system using a high-power Nd:YAG pulsed laser is used to precisely measure the vibration responses of membrane structures. The system generates a highly reproducible ideal impulse excitation. Active vibration control for membrane structures with DEAs is examined in this study. To improve the vibration control effect, multiple DEAs are applied. These actuators generate vibration control forces simultaneously during the control. Laminated DEAs are fabricated and attached to the membrane surface separately. An experimental setup including a digital control system is constructed with the laser excitation system. To demonstrate the effectiveness of the proposed method, a controller is designed by H∞ control theory with the identified membrane model and vibration control experiments are conducted.
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( Takehiko Seo ),( Naoki Hiruta ),( Masato Mikami ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
If jet engines of the airplane stop at high altitude, it is necessary to reignite and restart engines rapidly and surely in order to prevent the plane crash. The inside of combustion chamber will be low pressure and low temperature condition in this situation. It is difficult to reignite in this condition. The ignition performance is effected by the spray characteristics of fuel. To improve the reignition performance of jet engines and safety of airplanes, it is important to investigate the spray characteristics at low pressure. In this study, the spray characteristics at the subatmospheric pressure was investigated. The water atomization was conducted by pressure swirling atomizer that is installed in pressure chamber. The inside pressure of pressure chamber was set to 0.025 MPa simulated the pressure at high altitude condition (about 10000 m) by vacuum pump. The difference of injection pressure was 1.00 MPa. Additionally, swirler was installed around the pressure-swirl injector and provided swirling air flow on the spray by continuous running of vacuum pump. The spray characteristics were measured using PDPA. The results showed that the maximum Sauter mean diameter decreased and the droplet distribution changed from bimodal shape to monophasic shape. The reason was that swirling air flow made the entrainment weak and small droplets stayed at the main spray area.
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Active Vibration Control of a Membrane Structure Using PVDF Actuator
Yuelin Zhang,Toshiki Hiruta,Itsuro Kajiwara,Naoki Hosoya 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
To realize a vibration suppression of flexible structures like a membrane, the smart structures technology that uses material such as piezoelectric element is focused. In this study, a vibration control system using a PVDF film as an actuator for the membrane structure is proposed. To confirm the effectiveness of the proposed method, the control properties with H<SUB>∞</SUB> control for reducing single mode, 1st or 2nd mode vibration, are evaluated by using the non-contact laser excitation vibration test system. In the system, a high power pulse laser is used for producing an ideal impulse excitation and a laser Doppler vibrometer is used for measuring the response on the membrane. The obtained results show that the vibration suppression is achieved at each mode in all experiments. Therefore, the present method using the flexible piezoelectric element is effective to suppress the vibration of flexible structures.
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