时效变形 meaning in Chinese

secular distortion

Phase space reconstruction technique is used to reconstruct the phase plane . the approach to detect the abnormal point of the tune - dependent of the crack by phase space is developed . combined with gray system and catastrophe theory , according to observation data of dam cracks , a gray cusp catastrophe model is established to diagnose the abnormality of the crack
( 5 )利用相空间重构技术重构裂缝时效变形的相平面，提出了裂缝时效转异点的相平面识别法；并且基于突变理论和灰色系统理论，建立了裂缝转异诊断的灰色尖点突变模型；并将以上方法和模型用于工程实际，由此对所提方法的可行性进行了验证。