ENGINEERING CALCULATORS
Advertisement space
Engineering calculators (Beta)
Estimate force in the flow direction from speed, submerged projected area and drag coefficient.
Click the grid to add ordered vertices. Edit coordinates in mm; separate holes with a blank line. The last vertex closes to the first automatically.
Choose units and enter numbers. Full-width digits and fractions such as 1/8 or 1 3/8 are accepted. Changing a unit converts the entered value.
Reference calculation only. Results do not certify suitability for an actual design or its safety.
Inputs: select a blue symbol to edit Results: red-orange values and lines
3D shows an illustrative extrusion. Its display length does not enter the section calculations. Edit dimensions in 2D.
q = ρ v² / 2; F = Cd q A; F[kgf] = F[N] / 9.80665; A = h b (height × width mode)
Displayed values are rounded. Diagrams illustrate the calculation conditions. Initial material and fluid properties are examples; replace them with values for the actual material, temperature and conditions.
ReferenceEquations assume particular loads, supports and deformation ranges. Check inputs, units and the applicability of each equation. Diagrams explain conditions; they are not manufacturing drawings or proof of safety.
Material values are typical values or reference ranges, not certified product properties or ready-to-use design allowables. They vary with standards, product form, dimensions, temper and temperature. Check the specifications and inspection certificates for the actual product.
Displayed safety factors and checks apply only to the supplied inputs and calculation model. They do not automatically establish the safety of a complete design, including code compliance, service life, fatigue or joints. For actual design, manufacture and use, separately verify applicable regulations and standards, product specifications, and the necessary tests and engineering review.
Advertisement space
流速・水中の投影面積・抗力係数から、水流方向に押す力をN・kgfで求めます。
選択した形状・計算方法により、使う項目は変わります。実際の計算は上の図と入力欄で行えます。
q = ρ v² / 2; F = Cd q A; F[kgf] = F[N] / 9.80665; A = h b (height × width mode)
静止物体に一様・定常に当たる流れの抗力を概算します。Cdと投影面積の定義を一致させてください。hは水中にある物体部分の高さで、常に川全体の水深とは限りません。幅bは流れに正対する固体部分の合計幅です。隙間は含めず、合計後に本数を再度掛けません。人体の身長から面積やCdを推定しません。水温・塩分で密度は変わります。浮力、足場の摩擦、姿勢、衣服、非一様流、波・衝撃・漂流物は別の問題です。人が立てる・安全に渡れる・転倒しないことを判定する計算ではありません。
現在選択中の方法には、操作欄の「計算式・適用条件」を使ってください。参考計算であり、設計全体の安全性を保証するものではありません。
Estimate force in the flow direction from speed, submerged projected area and drag coefficient.
The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.
q = ρ v² / 2; F = Cd q A; F[kgf] = F[N] / 9.80665; A = h b (height × width mode)
Estimates drag on a stationary object in uniform, steady flow. Match the Cd definition to the reference area. h is the submerged height of the object, not necessarily total river depth. b is the combined solid width normal to flow, excluding gaps; do not multiply by the object count again. No area or Cd is inferred from human height. Density depends on temperature and salinity. Buoyancy, footing friction, posture, clothing, nonuniform flow, waves, impacts and debris are separate. This does not determine whether a person can stand, cross safely or avoid tipping.
The displayed formula and conditions in the working panel apply to the currently selected model. Reference calculation only; it does not certify a complete design.
