FWD被廣泛的應用在鋪面非破壞性檢測。現今各種FWD動態反算方法是基於不同理論下所發展出來的，但是其共通點為皆使用衝擊力之歷時來模擬實際落錘所造成的衝擊力，其中動態理論下使用的衝擊力歷時也因不同反算方法而有所不同，最常見的是使用三角形或半正弦波形來代表落錘之衝擊力歷時，本研究探討實際落錘對鋪面造成的位移反應是否適用衝擊力歷時來模擬，以及使用不同形狀的衝擊力歷時曲線模擬之正確性。
在本研究所使用之模型中，得知考慮落錘本身之影響與使用落錘求得之衝擊力兩種不同模型下，對鋪面造成的位移反應相同，即落錘本身可以使用其量測到之衝擊力來代替，不必再另外建立落錘模型來模擬，且使用不同形狀之衝擊力時，只要最大衝擊力與實際量測相同即可得到同樣的鋪面最大變位，在特定條件下，模擬的衝擊力歷時時間與實際衝擊歷時差距不大時，亦可得到同樣之鋪面最大變位。

FWD is widely used to nondestructive testing of pavement. Today many dynamic backcalculation methods are developed on the basis of different theories, but all of them are used a time history of pulse force to simulate the falling weight. There are many types of pulse force in different backcalculation methods, and the common type is half-cycle sine pulse force and triangular pulse force. This study discusses the difference of the pulse force and the falling weight, and the difference of the different pulse force types.
This study obtained that the pulse force causes the same deflection as the falling weight. Therefore we can use a pulse force to simulate the falling weight. The different pulse force types cause the same maximum deflection and so we can different types to simulate pulse force. In some specific condition that the duration of time history of pulse force do not have influence on the maximum deflection.

1.康裕明，「鋪面撓度的檢測與應用」，第一屆公共工程非破壞檢測技術研討會論
文集，pp.108-124，1999
2.Lukanen ,E. O.,”Effects of buffer on falling weight deflectometer
loadings and deflections”, Transportation Research Record 1355, pp37-51,1992
3.周明輝，「鋪面落重式撓度儀之校正與成效評估」，中原大學土木工程學系碩士論文，
2001
4.黃子哲，「道路彈性模數動態反算之探討」，逢甲大學土木工程學系碩士論文，1996
5.Uddin, W. , Zhang, D. , Fernadez, F., “Finite Element Simulation of
Pavement Discontinuities and Dynamic Load Response” , Transportation
Research Record 1448, pp.100-106, 1994
6.Mallela, J. and K.P. Georg, “Three-Dimensional Dynamic Response Model for
Rigid Pavement”, Transportation Research Record 1448, pp.92-99, 1994
7.Der-Wen Chang, Roesset, J. M., and Stokoe, K. H.,”Nonlinear effect in
falling weight deflectometer test” Transportation Research Record 1355,
pp.1-7,1992
8.Cheng ,L. O., Newcomb, D. E., and Siddharthan, R., ”Comparison of Dynamic
and Static Backcalculation Moduli for Three-layer
Pavement”,Transportation Research Record 1293,pp.86-92, 1991
9.Roesset ,J. M., Kausel, E., Cuellar, V., Monte, J. L., and Valerio, J., “Impact of Weight Falling onto the Ground”, Journal of Geotechnical
Engineering, Vol 120, No.8, August,pp.1394-1412, 1994
10.Mark R., “Impact of Weight Falling onto the Ground”, Journal of
Geotechnical Engineering, May , pp.414-416, 1996
11.Loizos, A., Boukovalas, G., and Karlaftis, A.,”Dynamic stiffness Modulus
for Pavement Subgrade Evaluation” ,Journal of Transportation
Engineering,ASCE, JULY/AUGUST, pp.434-443, 2003
12.葉麟，「FWD動態分析及探討反算修正因子」，成功大學土木工程學系碩士論文, 2002
13.Chopra, A. K.,” Dynamics of structures : theory and applications to earthquake engineering”, Prentice Hall,pp.143-150, 2000