The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2005
Filed:
Feb. 01, 2002
Edward Hage, Helmond, NL;
Wynand Witbreuk, Oldenzaal, NL;
Geurt Bastiaan Slootweg, Enschede, NL;
Marinus Hendrikus Olde Weghuis, Oldenzaal, NL;
Edward Hage, Helmond, NL;
Wynand Witbreuk, Oldenzaal, NL;
Geurt Bastiaan Slootweg, Enschede, NL;
Marinus Hendrikus Olde Weghuis, Oldenzaal, NL;
Ten Cate Thiolon B.V., Re Nijverdal, NL;
Abstract
The present invention relates to a method for determining the values of stiffness and dampening, in particular of surfaces for sports fields. The invention furthermore relates to a device for carrying out the aforesaid method. The object of the present invention is to provide a method and a device for determining the values of stiffness and dampening of an artificial grass lawn which provide a reliable measuring result in a quick and efficient manner, which device is furthermore user-friendly and easy to transport. In order to accomplish the aforesaid objective, the method according to the invention is characterized in that a block is placed on the surface in question, which block is struck by means of an electrically controlled excitator at an adjustable frequency interval, at a force which is sensed as a first signal by a force sensor, after which the acceleration of the block is determined as a second signal by means of an acceleration sensor, after which the frequency-dependent transfer function is determined using the aforesaid signals, from which the frequency-dependent stiffness and dampening behaviour of the surface in question is subsequently determined.