|
| Factors | Degree | evaluation contents | Score |
|
| Importance (I) | Very low | The influence on gear fatigue property⩽5% | 1-2 |
| Low | 5%< The influence on gear fatigue property⩽10% | 3-4 |
| Medium | 10%< The influence on gear fatigue property⩽20% | 5-6 |
| High | 20%< The influence on gear fatigue property⩽30% | 7-8 |
| Very high | The influence on gear fatigue property >30% | 9-10 |
|
| Changing difficulty (C) | Very high | It takes more than 3 million CNY for equipment to be replaced or improved, or more than one year for research and development. | 1-2 |
| High | It takes more than 1 million CNY for equipment to be replaced or improved, or more than half a year for research and development. | 3-4 |
| Medium | It takes more than 0.5 million CNY for equipment to be replaced or improved, or more than 3 months for research and development. | 5-6 |
| Low | It takes more than 0.1 million CNY for equipment to be replaced or improved, or more than one month for research and development. | 7-8 |
| Very low | It takes less than 0.1 million CNY for equipment to be replaced or improved, or less than one month for research and development. | 9-10 |
|
| Rationality (R) | Very high | The current process parameter has reached the best value and should be maintained. | 1-2 |
| High | The current process parameter is close to the best value and doesn’t need to be changed. | 3-4 |
| Medium | The current process parameter has a slight gap with the best value and should be slightly improved. | 5-6 |
| Low | The current process parameter has a big gap with the best value and should be studied and improved. | 7-8 |
| Very low | The current process parameter deviates completely from the best value and need urgent improvement. | 9-10 |
|
| Detection difficulty (D) | Very low | Only need simple observation. | 1-2 |
| Low | Some testing tools are needed. | 3-4 |
| Medium | Need some simple tests. | 5-6 |
| High | Need a lot of tests. | 7-8 |
| Very high | Need to be found in use. | 9-10 |
|
