{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T01:26:44Z","timestamp":1760232404377,"version":"build-2065373602"},"reference-count":18,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2022,10,28]],"date-time":"2022-10-28T00:00:00Z","timestamp":1666915200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52105274","21JK0902","2022JQ-386"],"award-info":[{"award-number":["52105274","21JK0902","2022JQ-386"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Special Scientific Research Program of Shaanxi Provincial Department of Education","award":["52105274","21JK0902","2022JQ-386"],"award-info":[{"award-number":["52105274","21JK0902","2022JQ-386"]}]},{"DOI":"10.13039\/501100004480","name":"Natural Science Foundation of Shanxi Province","doi-asserted-by":"publisher","award":["52105274","21JK0902","2022JQ-386"],"award-info":[{"award-number":["52105274","21JK0902","2022JQ-386"]}],"id":[{"id":"10.13039\/501100004480","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The impact velocity of falling weight is an instantaneous quantity. Currently, measurement of impact velocity relies on high-speed sensors to capture the moment of impact. The trajectory-position measurement method (TPMM) is proposed in this study. The main steps are: (1) The impact position is used to capture the impact time. It can be measured when the falling weight is stationary. (2) The discrete falling trajectory is measured and a new empirical regression algorithm is proposed to fit the expression of falling trajectory. (3) The impact velocity is obtained by taking the impact time into the first derivative of the trajectory expression. For 1\u20135 m falling height, the simulation shows that the relative maximum error and relative expanded uncertainty of the proposed method are less than 0.481% and 0.442%, respectively. Then, the actual experiment is carried out to verify the simulation. The proposed method has high accuracy and low uncertainty. The reasons are: (1) Only a low-speed displacement sensor is need for impact velocity measurement. It is easier to improve accuracy and stability of a low-speed sensor. (2) The empirical regression algorithm can improve the stability of falling trajectory fitting.<\/jats:p>","DOI":"10.3390\/s22218288","type":"journal-article","created":{"date-parts":[[2022,10,30]],"date-time":"2022-10-30T10:47:57Z","timestamp":1667126877000},"page":"8288","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Impact Velocity Measurement Method Based on Trajectory and Impact Position"],"prefix":"10.3390","volume":"22","author":[{"given":"Hui","family":"Liu","sequence":"first","affiliation":[{"name":"School of Automation, Xi\u2019an University of Posts & Telecommunications, Xi\u2019an 710121, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingfan","family":"Wang","sequence":"additional","affiliation":[{"name":"Shaanxi Institute of Metrology Science, Xi\u2019an 710100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuantao","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Automation, Xi\u2019an University of Posts & Telecommunications, Xi\u2019an 710121, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"5877","DOI":"10.3390\/ma8095281","article-title":"Drop-weight impact test on U-shape concrete specimens with statistical and regression analyses","volume":"8","author":"Zhu","year":"2015","journal-title":"Materials"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.jbiomech.2018.05.003","article-title":"Evaluation of the head-helmet sliding properties in an impact test","volume":"75","author":"Trotta","year":"2018","journal-title":"J. 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