Contents of the 60TH Anniversary Series, Volume 10, Recent Studies on Ship Vibration in Japan

The Society of Naval Architects of Japan

60TH ANNIVERSARY SERIES

VOLUME 10

•RECENT STUDIES ON SHIP VIBRATION

IN JAPAN

By

Masao

Toyoji

and

Takeshi

The Society of Naval Architects of Japan

C O N T E N T S

I N T R O D U C T I O N i

C H A P T E R l . N A T U R A L F R E Q U E N C Y OF SHIP H U L L V I B R A T I O N

I n t r o d u c t i o n 1 § 1 Effects of Shear R i g i d i t y and R o t a t o r y I n e r t i a on the N a t u r a l Frequency of

the F l e x u r a l Ship H u l l V i b r a t i o n s 2 § 2 V i r t u a l Mass of W a t e r i n the F l e x u r a l V i b r a t i o n s of a Ship 6

§ 3 • V i r t u a l Mass M o m e n t of I n e r t i a of W a t e r i n Torsional V i b r a t i o n of a Ship . . 11

§ 4 E f f e c t of Shallow W a t e r on the H u l l V i b r a t i o n 16 § 5 E f f e c t of L o c a t i o n of E n g i n e along L e n g t h o f Ship on t h e H u l l V i b r a t i o n . . . . 18

C H A P T E R 2. E S T I M A T I O N OF N A T U R A L F R E Q U E N C Y OF SHIP V I B R A T I O N

I n t r o d u c t i o n 20 § 6 Measurements of N a t u r a l Frequencies of H u l l V i b r a t i o n s on Board 20

§ 7 E s t i m a t i o n of the L o w e r Mode N a t u r a l Frequency of F l e x u r a l H u l l V i b r a t i o n . . 27 § 8 E s t i m a t i o n of the H i g h e r Mode N a t u r a l Frequency o f F l e x u r a l H u l l V i b r a t i o n . . 38

§ 9 N a t u r a l Frequency of the Torsional H u l l V i b r a t i o n 40

§ 10 Stern V i b r a t i o n of a Ship 44 C H A P T E R 3. RESPONSE OF N A T U R A L V I B R A T I O N OF A SHIP A N D P R O P E L L E R FORCES E X C I T I N G H U L L V I B R A T I O N I n t r o d u c t i o n 48 § 11 D a m p i n g Coefficient of H u l l V i b r a t i o n 48 § 12 Response of V i b r a t i o n of a Ship 51 § 1 3 Propeller Force E x c i t i n g H u l l V i b r a t i o n 55 § 14 Surface Force 56 § 15 B e a r i n g Force 58 C H A P T E R 4. H U M A N S E N S I T I V I T Y OF V I B R A T I O N O N B O A R D SHIP I n t r o d u c t i o n 62 § 16 L i m i t of H u m a n S e n s i t i v i t y t o V i b r a t i o n 62 C H A P T E R 5. L O C A L V I B R A T I O N OF A SHIP I n t r o d u c t i o n 67 § 17 V i b r a t i o n of Panel w i t h Stiffeners, P a r t i a l Load and P e r f o r a t i o n 67

§ 1 8 V i b r a t i o n of S t r u c t u r a l E l e m e n t 72 § 19 V i b r a t i o n of Double B o t t o m 73 § 20 V i b r a t i o n of the Transverse Section o f a Ship 74

§ 2 1 V i r t u a l Mass of W a t e r i n V i b r a t i o n s of Plate and T a n k W a l l 76 § 2 2 T r a n s i t i o n a l V i b r a t i o n of Beam, C o l u m n and Plate due t o D y n a m i c a l L o a d . . 81