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＜Upper-Intermediate＞ Lesson No.17
Technical Solution Review for Hull Vibration Countermeasures / 船体振動対策の技術解決策検討
０．Greetings & Ice-break (2min.)｜挨拶と導入
0-1 Greetings
Let’s practice a short small talk that you can use to greet a business partner and start building a good relationship.
講師との挨拶を兼ねて、ビジネスパートナーと信頼関係を築くための短いスモールトークを練習してみましょう。
[Tips / 会話のヒント]
・Can you hear me clearly?
私の声はクリアに聞こえますか？
・How's your day going so far?
今日はどんな一日でしたか？
・Talk about one small topic (Work, Weather, News, Hometown, Sports event, etc.)
軽い話題について話しましょう（仕事、天気、ニュース、地元、スポーツイベントなど）
0-2 Introduction
In today’s lesson, we’ll learn about the following situation. Have you ever experienced something similar?
本日のレッスンでは以下のようなシチュエーションについて学びます。同様のシチュエーションを経験したことがありますか？
- If you have experience, please tell us what it was like, what was difficult, or what you learned.
経験があれば、どんな内容だったか、難しかったことや学んだことなどを教えて下さい。
- If you don’t have experience, try to imagine yourself handling that situation in English.
What do you think would be challenging?
経験がなければ、英語でその状況に対応しているところを想像してみましょう。どんなことが難しそうですか？
Situation / シチュエーション
Conducting technical countermeasure studies with overseas vibration analysis specialists as hull vibration problems require urgent resolution.
船体振動問題解決が急務となり、海外振動解析専門会社と技術的対策を検討する場面です。
1. Read (2 min)｜型を学ぶ
Let's read the following key sentences aloud!
下記の文章や単語を順番に音読しましょう！
1-1 Basic phrases
１．Could you elaborate on...（...について詳しく説明していただけますか）
２．We need to assess whether...（...かどうか評価する必要がある）
３．Our analysis demonstrates that...（解析の結果...が実証された）
４．We recommend installing...（...の設置を推奨する）
５．Could you calculate the effectiveness of...（...の有効性を計算していただけますか）
６．Let me propose a combined approach...（複合的アプローチを提案させてください）
７．We'll commit to...（...に取り組む）
1-2 Essential words
１．elaborate（詳しく説明する）
２．assess（評価する）
３．demonstrate（実証する）
４．modify（変更する）
５．trigger（引き起こす）
６．considerable（相当な）
７．calculate（計算する）
８．acknowledge（認識する）
９．monitor（監視する）
１０．accelerate（加速する）
2. Try (3 min)｜ロールプレイ練習
Let’s practice the role-play.
ロールプレイの練習をしましょう！
Situation / シチュエーション（Reference again）
Conducting technical countermeasure studies with overseas vibration analysis specialists as hull vibration problems require urgent resolution.
船体振動問題解決が急務となり、海外振動解析専門会社と技術的対策を検討する場面です。
👨💼【Teacher / Vibration Analysis Expert】:
Thank you for meeting with me today. We've completed our analysis of the hull vibration issue on your new vessel. The vibration level exceeds acceptable standards by 15 percent, and we need to discuss corrective measures immediately.
（本日はお時間をいただきありがとうございます。新造船の船体振動問題の解析が完了しました。振動レベルが許容基準を15パーセント超過しており、直ちに是正措置を協議する必要があります。）
🧑🎓【Student / Design Engineer】:
Thank you for the detailed analysis. Could you elaborate on the root cause of this excessive vibration? We need to assess whether the issue originates from the propeller design or the engine mounting system.
（詳細な解析をありがとうございます。この過剰な振動の根本原因について詳しく説明していただけますか？問題がプロペラ設計とエンジン取付システムのどちらに起因するか評価する必要があります。）
👨💼【Teacher / Vibration Analysis Expert】:
Our analysis demonstrates that the primary factor is resonance between the propeller frequency and the hull structure. The propeller blade rate coincides with the natural frequency of the aft section. We recommend installing additional stiffeners or modifying the propeller blade count.
（解析の結果、主要因はプロペラ周波数と船体構造の共振であることが実証されました。プロペラ翼数周波数が船尾部の固有振動数と一致しています。追加補強材の設置またはプロペラ翼数の変更を推奨します。）
🧑🎓【Student / Design Engineer】:
I appreciate your recommendation. However, modifying the propeller at this stage would trigger considerable delays and cost increases. Could you calculate the effectiveness of installing stiffeners alone? We need to evaluate whether this alternative can reduce vibration to an acceptable level without changing the propeller.
（ご提案に感謝します。しかし、この段階でプロペラを変更すると相当な遅延とコスト増加を引き起こします。補強材の設置のみの有効性を計算していただけますか？プロペラを変更せずにこの代替案で振動を許容レベルまで低減できるか評価する必要があります。）
👨💼【Teacher / Vibration Analysis Expert】:
We understand your concern about the schedule. Based on our simulation, installing 8 longitudinal stiffeners in the aft section can reduce vibration by approximately 10 percent. However, this may not be sufficient to meet the standard. We're hesitant to guarantee full compliance with stiffeners alone.
（スケジュールに関するご懸念は理解しています。シミュレーションによると、船尾部に8本の縦補強材を設置すれば振動を約10パーセント低減できます。ただし、これでは基準を満たすには不十分かもしれません。補強材のみで完全な適合を保証することはためらわれます。）
🧑🎓【Student / Design Engineer】:
I acknowledge the limitation. Let me propose a combined approach. We can install the stiffeners immediately and monitor the vibration during sea trials. If the reduction is insufficient, we'll proceed with propeller modification as a secondary measure. This approach allows us to minimize initial costs while maintaining a backup solution. Could you assess this phased strategy?
（制約は認識しています。複合的アプローチを提案させてください。補強材を直ちに設置し、海上試運転中に振動を監視します。低減が不十分であれば、二次的措置としてプロペラ変更を進めます。このアプローチにより初期コストを最小化しつつ予備的解決策を維持できます。この段階的戦略を評価していただけますか？）
👨💼【Teacher / Vibration Analysis Expert】:
That's a reasonable strategy. We can carry out vibration measurements during the trials and provide real-time analysis. The stiffener installation will cost approximately 45000 USD and require 3 weeks. If propeller modification becomes mandatory, the additional cost would be 120000 USD with a 6-week lead time.
（それは妥当な戦略です。試運転中に振動測定を実施し、リアルタイム解析を提供できます。補強材設置の費用は約45000米ドルで3週間を要します。プロペラ変更が必須となる場合、追加費用は120000米ドルで納期は6週間です。）
🧑🎓【Student / Design Engineer】:
Thank you for the breakdown. We'll commit to the stiffener installation immediately and coordinate with the shipyard to accelerate the work. Please submit the detailed installation drawing by next week so we can proceed without delay. This phased approach will help us manage both technical risk and budget constraints effectively.
（内訳をありがとうございます。補強材設置に直ちに取り組み、造船所と調整して作業を加速します。遅延なく進められるよう来週までに詳細な設置図面を提出してください。この段階的アプローチにより技術的リスクと予算制約の両方を効果的に管理できます。）
👨💼【Teacher / Vibration Analysis Expert】:
Understood. We'll expedite the drawing preparation and deliver it within 5 business days. I'm confident this collaborative approach will resolve the vibration issue efficiently. Let's stay in close communication throughout the trial period to ensure we achieve the target performance.
（承知しました。図面作成を迅速化し、5営業日以内に納品します。この協力的アプローチで振動問題を効率的に解決できると確信しています。目標性能を達成できるよう試運転期間中は緊密に連絡を取り合いましょう。）
3. Use (4 min)｜ロールプレイ & 実践（空欄補完）
Let's perform the role-play and fill in the blanks by translating the Japanese into English!
空欄の日本語を英語に訳しながら、ロールプレイを実践してみましょう！
Situation / シチュエーション（Reference again）
Conducting technical countermeasure studies with overseas vibration analysis specialists as hull vibration problems require urgent resolution.
船体振動問題解決が急務となり、海外振動解析専門会社と技術的対策を検討する場面です。
👨💼【Teacher / Vibration Analysis Expert】:
Thank you for meeting with me today. We've completed our analysis of the hull vibration issue on your new vessel. The vibration level exceeds acceptable standards by 15 percent, and we need to discuss corrective measures immediately.
🧑🎓【Student / Design Engineer】:
Thank you for the detailed analysis. Could you ［詳しく説明する］ on the root cause of this excessive vibration? We need to ［評価する］ whether the issue originates from the propeller design or the engine mounting system.
👨💼【Teacher / Vibration Analysis Expert】:
Our analysis demonstrates that the primary factor is resonance between the propeller frequency and the hull structure. The propeller blade rate coincides with the natural frequency of the aft section. We recommend installing additional stiffeners or modifying the propeller blade count.
🧑🎓【Student / Design Engineer】:
I appreciate your recommendation. However, ［変更する］ing the propeller at this stage would ［引き起こす］ ［相当な］ delays and cost increases. Could you ［計算する］ the effectiveness of installing stiffeners alone? We need to ［評価する］ whether this alternative can reduce vibration to an acceptable level without changing the propeller.
👨💼【Teacher / Vibration Analysis Expert】:
We understand your concern about the schedule. Based on our simulation, installing 8 longitudinal stiffeners in the aft section can reduce vibration by approximately 10 percent. However, this may not be sufficient to meet the standard. We're hesitant to guarantee full compliance with stiffeners alone.
🧑🎓【Student / Design Engineer】:
I ［認識する］ the limitation. Let me propose a combined approach. We can install the stiffeners immediately and ［監視する］ the vibration during sea trials. If the reduction is insufficient, we'll proceed with propeller modification as a secondary measure. This approach allows us to minimize initial costs while maintaining a backup solution. Could you ［評価する］ this phased strategy?
👨💼【Teacher / Vibration Analysis Expert】:
That's a reasonable strategy. We can carry out vibration measurements during the trials and provide real-time analysis. The stiffener installation will cost approximately 45000 USD and require 3 weeks. If propeller modification becomes mandatory, the additional cost would be 120000 USD with a 6-week lead time.
🧑🎓【Student / Design Engineer】:
Thank you for the breakdown. We'll commit to the stiffener installation immediately and coordinate with the shipyard to ［加速する］ the work. Please submit the detailed installation drawing by next week so we can proceed without delay. This phased approach will help us manage both technical risk and budget constraints effectively.
👨💼【Teacher / Vibration Analysis Expert】:
Understood. We'll expedite the drawing preparation and deliver it within 5 business days. I'm confident this collaborative approach will resolve the vibration issue efficiently. Let's stay in close communication throughout the trial period to ensure we achieve the target performance.
4. Challenge (7 min)｜応用実践
Let's perform the role-play and fill in the blanks by translating the Japanese into English!
空欄の日本語を英語に訳しながら、ロールプレイを実践してみましょう！
*Let's practice this part repeatedly until we can speak it smoothly.
このパートはスムーズにスピーキングできるようになるまで繰り返し練習しましょう。
Situation / シチュエーション（Reference again）
Conducting technical countermeasure studies with overseas vibration analysis specialists as hull vibration problems require urgent resolution.
船体振動問題解決が急務となり、海外振動解析専門会社と技術的対策を検討する場面です。
👨💼【Teacher / Vibration Analysis Expert】:
Thank you for meeting with me today. We've completed our analysis of the hull vibration issue on your new vessel. The vibration level exceeds acceptable standards by 15 percent, and we need to discuss corrective measures immediately.
🧑🎓【Student / Design Engineer】:
Thank you for the detailed analysis. ［この過剰な振動の根本原因について詳しく説明していただけますか？］ ［問題がプロペラ設計とエンジン取付システムのどちらに起因するか評価する必要があります。］
👨💼【Teacher / Vibration Analysis Expert】:
Our analysis demonstrates that the primary factor is resonance between the propeller frequency and the hull structure. The propeller blade rate coincides with the natural frequency of the aft section. We recommend installing additional stiffeners or modifying the propeller blade count.
🧑🎓【Student / Design Engineer】:
I appreciate your recommendation. However, modifying the propeller at this stage would trigger considerable delays and cost increases. ［補強材の設置のみの有効性を計算していただけますか？］ We need to evaluate whether this alternative can reduce vibration to an acceptable level without changing the propeller.
👨💼【Teacher / Vibration Analysis Expert】:
We understand your concern about the schedule. Based on our simulation, installing 8 longitudinal stiffeners in the aft section can reduce vibration by approximately 10 percent. However, this may not be sufficient to meet the standard. We're hesitant to guarantee full compliance with stiffeners alone.
🧑🎓【Student / Design Engineer】:
I acknowledge the limitation. ［複合的アプローチを提案させてください。］ We can install the stiffeners immediately and monitor the vibration during sea trials. If the reduction is insufficient, we'll proceed with propeller modification as a secondary measure. This approach allows us to minimize initial costs while maintaining a backup solution. Could you assess this phased strategy?
👨💼【Teacher / Vibration Analysis Expert】:
That's a reasonable strategy. We can carry out vibration measurements during the trials and provide real-time analysis. The stiffener installation will cost approximately 45000 USD and require 3 weeks. If propeller modification becomes mandatory, the additional cost would be 120000 USD with a 6-week lead time.
🧑🎓【Student / Design Engineer】:
Thank you for the breakdown. We'll commit to the stiffener installation immediately and coordinate with the shipyard to accelerate the work. Please submit the detailed installation drawing by next week so we can proceed without delay. This phased approach will help us manage both technical risk and budget constraints effectively.
👨💼【Teacher / Vibration Analysis Expert】:
Understood. We'll expedite the drawing preparation and deliver it within 5 business days. I'm confident this collaborative approach will resolve the vibration issue efficiently. Let's stay in close communication throughout the trial period to ensure we achieve the target performance.
\ If you have some extra capacity, give it a try（余力があればやってみましょう）/
5. Real-world application (5 min)｜実務応用
Let's speak freely with the phrases and flow we learned today. If you can, imagine your real job—it makes practice more effective.
本日学習した単語やフレーズ、会話の流れを思い出しながら、自由に話してみましょう。可能であれば、自身の実務を想像しながら話すと効果的です。
Situation / シチュエーション
A vibration analysis expert has completed the analysis of hull vibration on a new vessel and presents corrective measures to the design engineer.
The design engineer evaluates the feasibility and cost-effectiveness of the proposed solutions and selects the optimal approach.
振動解析専門家が新造船の船体振動解析を完了し、設計エンジニアに是正措置を提示する。
設計エンジニアは提案された解決策の実現可能性とコスト効果を評価し、最適なアプローチを選定する。
👨💼【Teacher / Vibration Analysis Expert】:
We've identified the vibration issue and prepared several corrective options. Could you share your thoughts on which approach would be most feasible for your project schedule and budget?
（振動問題を特定し、いくつかの是正オプションを準備しました。プロジェクトのスケジュールと予算にとってどのアプローチが最も実現可能か、お考えをお聞かせいただけますか？）
🧑🎓【Student / Your Role】:
(Free Speaking based on today's lesson)
Hints / ヒント
１． Elaborate on the root cause
２． Calculate the effectiveness of alternatives
３． Propose a combined approach
４． Commit to immediate action
※This is not a role-play. Please speak until you finish your thoughts.
このパートはロールプレイ形式ではありません。最後まで通して話してみましょう。
6. Wrap-up (2 min) ｜レッスンの振り返り
Let's review today's lesson with your teacher!
今日のレッスンについて講師と振り返ってみましょう！
6-1 Comments from student
・Good points / 良かったところ・上手くできたところ
・Things to work on / 今後強化したいところ
6-2 Feedback from teacher
・Good points / 良かった点
・Things to work on / 今後の強化ポイント
・What to review / 復習ポイント
*6-3 Questions from student (if any)
Japanese translation（日本語訳）
1. Read (2min)（型を学ぶ）｜基本フレーズ
2. Try (4min)（ロールプレイ練習）｜型を使った練習
Let’s practice the role-play.
ロールプレイの練習をしましょう！
3. Use (7min)｜応用
Let’s perform the role-play and filling in the missing English!
英語を補完しながら、ロールプレイを実践してみましょう！
4. Challenge (7min)｜実践
Let’s perform the role-play and filling in the missing English!
英語を補完しながら、ロールプレイを実践してみましょう！
5. Wrap-up (3min) – レッスンの振り返り
"Let’s review today’s lesson with your teacher!”
「今日のレッスンについて講師と振り返ってみましょう！」
5-1. Comments from Student
- Good points / 良かったところ・上手くできたところ
- Things to work on / 今後強化したいところ
5-2. Feedback from Teacher
- Good points / 良かった点
- Things to work on / 今後の強化ポイント
- What to review / 復習ポイント
5-3. Question from Students (If any)
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