Research on Computer Aided Design Method for the particles distribution of Table-tennis racket

The International Table Tennis Federation
Racket Control
Directives of Procedures 

Chapter 1:  Introduction
 
The purpose of this Technical Leaflet is to describe how the tournament officials may check and measure that a racket is legal and does not release volatile solven vapours, except water. All technical details are provided in the Technical Leaflet T9 othe ITTF Equipment Committee. 
 
During a tournament the umpires, the referees and racket controllers contribute to an efficient inspection of the rackets. Before the event starts, the tournament organisers provide and equip the needed facilities, and deliver  them the latest one day before the competition starts.
 
Chapter 2:  The Laws of Table Tennis
 
The Laws of Table Tennis relating to the racket are:

2.4 THE RACKET
 
2.4.1.  The racket may be of any size, shape or weight but the blade shall be flat and rigid.
2.4.2.  At least 85% of the blade by thickness shall be of natural wood; an adhesive layer within the blade may be  reinforced with fibrous material such as carbon fibre, glass fibre  or compressed paper, but shall not be thicker than 7.5% of the total thickness or 0.35mm, whichever is the smaller.
2.4.3.  A side of the blade used for striking the ball shall be covered with either ordinary pimpled rubber, with pimples outwards having a total thickness including adhesive of not more than 2mm, or sandwich rubber, with pimples inwards or outwards, having a total thickness including adhesive of not more than 4mm.
2.4.3.1. Ordinary pimpled rubber is a single layer of non-cellular rubber, natural or synthetic, with pimples evenly distributed over its surface at a density of not less than 10 per sq. cm and not more than 30 per sq. cm.
2.4.3.2. Sandwich rubber is a single layer of cellular rubber covered with a single outer layer of ordinary pimpled rubber, the thickness of the pimpled rubber not being more than 2mm.
2.4.4.  The covering material shall extend up to but not beyond the limits of the blade, except that the part nearest  the handle and gripped by the fingers may be left uncovered or covered with any material.
2.4.5.  The blade, any layer within the blade and any layer of covering material or adhesive on a side used for striking the ball shall be continuous and of even thickness.
 
2.4.6.  The surface of the covering material on a side of the blade, or of a side of the blade if it is left uncovered, shall be matt, bright red on one side and black on the other.
2.4.7.  The covering material should be  used as it has been authorised by the ITTF without any physical, chemical  or other treatment, changing or modifying playing properties, friction,  outlook, colour, structure, surface, etc.
2.4.7.1. Slight deviations from continuity of surface or uniformity of colour due to accidental damage or wear may be allowed provided that they do not significantly change the characteristics of the surface.
2.4.8.  At the start of a match and whenever he changes his racket during a match a player shall show his opponent and the umpire the racket he is about to use and shall allow them to examine it.
 
Chapter 3:  Regulations for International Competitions
 
The Regulations for International Competitions of Table Tennis relating to the racket are:
 
3.2 EQUIPMENT AND PLAYING CONDITIONS
 
3.2.1  Approved and authorised equipment
 
3.2.1.3. The covering material on a side of the blade used for striking the ball shall be of a brand and type currently authorised by the ITTF and shall be attached to the blade so that the supplier and brand names and the ITTF logo plus the ITTF number (when applied) are clearly visible near the edge of the striking surface.
List of all approved and authorised equipment and materials are maintained by the ITTF Office and details are available at the ITTF web site.
 
3.2.4 Gluing
 
3.2.4.1  It is the responsibility of each player to ensure that racket coverings are attached to their racket blade with adhesives that do not contain harmful volatile solvents.
3.2.4.2  Tests for harmful volatile solvents shall be carried out at World and Olympic title competitions, Pro-Tour tournaments and World Junior Circuit events, and a player whose racket is  found to contain such a solvent is liable to be disqualified from the  competition and reported to his Association.
3.2.4.3  At all ITTF events  a properly ventilated area shall be provided for the attachment of racket coverings to  rackets, and liquid adhesives shall not be used anywhere else at the playing venue.
“Playing venue” means the whole establishment in the playing building and the ground where the playing building  stands, which contains the doorway, the parking lot and related facilities.

Research on Computer Aided Design Method for the particles distribution of Table-tennis racket
Abstract:We present a method for the particles distribution of Table-tennis racket

The method has been implemented and tested to validate our claim.

PURPOSE: A table tennis racket and a blade for a table tennis racket are provided to form many reforming material areas or different material areas to be dispersed on a hitting surface of the blade and to reduce bad characteristic of the wood constituting the blade. CONSTITUTION: On the hitting surface of the blade for a table tennis racket, plural reforming areas(111) are formed. The blade for a table tennis racket includes a body(1) having a hitting surface(11) and a grip(2) extending from the body(1) integrally, and many different material areas are dispersed on the hitting surface(11). The many different material areas are divided into plural groups having different dispersion densities. In the different material area, a different material is filled into a recess portion formed on the hitting surface(11). The recess portion is a through hole penetrating the body(1).

The present invention relates to a table tennis racket comprising a core of synthetic material and a covering fitted onto said core by overmolding or by co-molding. According to the invention, the core is in the form of a single piece presenting a tubular handle and a paddle of thickness that is smaller than the smallest outside diametral dimension of the tubular handle, and it is provided with a plurality of recesses, between them defining a plurality of partitions extending perpendicularly to the plane of the paddle.

This invention refers to a novel ballgame racket, especially a tennis racket, including a racket head formed by a tension frame with stringing, and also having a grip portion joining the tension frame, for example by means of a crossing and formed by a gripping shaft or a racket neck and a handle.

转载自：https://blog.csdn.net/happyxiafan/article/details/4304637