Bulk Data Entry Used to define the harmonic coefficients of loading, in cyclic symmetry analysis.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
LOADCYH SID S HID HTYPE S1 L1 S2 L2
+ S3 L3 etc.

## Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
LOADCYH 12 1.0 11 C 2.5 23 1.0 11

## Definitions

Field Contents SI Unit Example

No default (Integer > 0)

S Scale factor. 6

No default (Real)

HID Harmonic index. 3

This entry is valid only when HTYPE = C or S.

No default (Integer ≥ 0)

HTYPE Flag for the harmonic type. 4 5
blank (Default)
The load will be applied to both C and S components.
GRAV
RFORCE
C
Coefficient of Cosine components of harmonics specified through HID.
S
Coefficient of Sine components of harmonics specified through HID.

(Character or blank)

Si Scale factor. 6

No default (Real)

No default (Integer > 0)

1. LOADCYH Bulk Data Entry can be referenced by LOAD in the Subcase Information section.
3. LOADCYH cannot share a same ID with other load set bulk entries. The harmonic index HID should be also specified by HARMONICS, and are supposed to be non-negative and must be no greater than (NSEG is defined in the CYSYM Bulk Data Entry).
If NSEG is odd:(1)
$\left(\frac{NSEG-1}{2}\right)$
If NSEG is even:(2)
$\left(\frac{NSEG}{2}\right)$
4. When, HTYPE = GRAV and RFORCE, the loading refers to GRAV and RFORCE entries, respectively. In these cases, HID is not required since the harmonic loads for appropriate available harmonics (also specified by HARMONICS) will be generated automatically.
5. An arbitrary load $\left\{{F}^{\left(j\right)}\right\}$ applied to the ${j}^{th}$ segment of the structure (through LOADCYN) can be decomposed as: (3)
$\left\{{F}^{\left(j\right)}\right\}=\sum _{l}\left[\left\{{F}_{l}\right\}\mathrm{cos}\frac{2\pi l\left(j-1\right)}{NSEG}+\left\{{\overline{F}}_{l}\right\}\mathrm{sin}\frac{2\pi l\left(j-1\right)}{NSEG}\right]$

Where, $l$ is the harmonic index (HID).

HTYPE = C or S are load options that directly specify the above coefficients $\left\{{F}_{l}\right\}$ and $\left\{{\overline{F}}_{l}\right\}$ of the ${l}^{th}$ harmonic, for the cosine and sine components, respectively.

If HTYPE is blank, the load will be applied to both C and S components.

$\stackrel{\to }{P}=S\left(\sum _{i=1}^{N}{S}_{i}{\stackrel{\to }{P}}_{{L}_{i}}\right)$
${\stackrel{\to }{P}}_{{L}_{i}}$
$N$