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Oil and viscous damper force and heat calculator

Engineering calculators (Beta)

Calculate resistance, heat per stroke and mean duty power for a damper driven at constant speed; separate from impact stopping.

Inputs

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.

Results

Reference calculation only. Results do not certify suitability for an actual design or its safety.

Diagram

Inputs: select a blue symbol to edit Results: red-orange values and lines

Formula and applicability

Linear: F=cv. Reference fit: F=Fref(v/vref)^α. Resistance opposes motion; tmove=s/v; E=Fs; Pmove=Fv; Pavg=E/tc.

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.

Reference
Using this information as a reference

Equations 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.

Calculations do not submit input values to a server. Results are not an automatic code-compliance or safety determination.

この計算で求められること

一定速度で動かすダンパーの抵抗力と1行程の発熱、繰返し平均動力を確認します。衝突停止の計算とは分けて扱います。

入力・結果・適用条件を確認する

主な入力

  • 抵抗力のモデル
  • 基準速度での実測・指定抵抗力 Fref
  • 上記抵抗力に対応する基準速度 vref
  • 実測範囲での速度指数 α
  • 粘性減衰係数 c（例）
  • 一定の移動速度 v（大きさ）
  • 1回の減衰行程 s
  • 減衰行程の開始から次の開始まで tc
  • 比較する抵抗力上限 Fcap（例）
  • 比較する平均吸収動力上限 Pcap（例）

得られる結果

  • 運動と逆向きの抵抗力の大きさ F (N)
  • 1行程で熱になるエネルギー E (J)
  • 繰返し平均吸収動力 Pavg (W)
  • 動いている間の吸収動力 Pmove (W)
  • 1行程にかかる時間 tmove (s)
  • 入力抵抗力上限／抵抗力 (—)
  • 入力平均動力上限／平均動力 (—)

Linear: F=cv. Reference fit: F=Fref(v/vref)^α. Resistance opposes motion; tmove=s/v; E=Fs; Pmove=Fv; Pavg=E/tc.

直動のオイルダンパー等を、速度比例F=cvまたは実測基準点F=Fref(v/vref)^αで近似します。後者は適用できる速度範囲と指数αを実測・製品資料から指定し、オイルだから一律に同じ指数とはしません。入力cはその運動方向・速度・温度で適用できる係数を指定します。シール摩擦、低速不感帯、指数で表せない特性、位置依存、圧縮・伸長での特性差、温度上昇による変化は含みません。vは外から一定速度で動かす条件で、質量を自由に衝突させたときの停止距離を求める式ではありません。往復両方向で減衰する場合は1行程ずつ数え、tcを半往復の間隔にするか両行程のエネルギーを別に合計します。tc≥s/vとし、製品の許容ストローク、取付強度、温度、寿命、復帰条件は別に確認します。入力上限は例です。

関連する計算

What this calculator does

Calculate resistance, heat per stroke and mean duty power for a damper driven at constant speed; separate from impact stopping.

Inputs, outputs and applicability

Inputs

  • Resistance model
  • Measured / specified resistance Fref at reference speed
  • Reference speed vref for that resistance
  • Velocity exponent α within measured range
  • Viscous damping coefficient c (example)
  • Constant motion speed v (magnitude)
  • Damped travel s per stroke
  • Time tc between starts of damped strokes
  • Entered resisting-force limit Fcap (example)
  • Entered mean absorbed-power limit Pcap (example)

Results

  • Resistance magnitude F opposite motion (N)
  • Heat energy E per damped stroke (J)
  • Mean absorbed power Pavg over repeated strokes (W)
  • Absorbed power Pmove while moving (W)
  • Time tmove for one stroke (s)
  • Entered resisting-force limit / resistance (—)
  • Entered mean-power limit / mean power (—)

Linear: F=cv. Reference fit: F=Fref(v/vref)^α. Resistance opposes motion; tmove=s/v; E=Fs; Pmove=Fv; Pavg=E/tc.

Approximate translational oil damping by F=cv or a measured-reference power law F=Fref(v/vref)^α. Establish the applicable velocity range and exponent from measurements or product data; oil dampers do not share a universal exponent. Enter c applicable to the actual direction, speed and temperature. Seal friction, low-speed dead bands, behaviour beyond the fitted exponent, position dependence, compression/extension differences and thermal changes are excluded. Motion is externally driven at constant speed; this is not a free-impact stopping-distance model. If both directions dissipate, count each stroke, use the interval between consecutive damped strokes or add both energies separately. Require tc≥s/v. Verify product travel, mounting, temperature, life and reset conditions separately. Entered limits are examples.

Related tools

数値の感覚を、図と動きで確かめる

説明用の別モデルです。適用条件を確認してください。数値は自動転記しません。

See the idea in diagrams and motion

A separate explanatory model. Check its assumptions; values are not transferred.