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290 Mirela Panaite et al. Metoda folosită în studiu a fost metoda analizei de textură, metodă ce permite studierea comportamentului vîscoelastic a produselor vegetale cu textură moale. Cercetările s-au realizat pe o gamă largă de produse alimenatre cu textură moale: brânză închegată, căpşuni, banane decojite, rahat alimentar. Rezultatele experimentale obţinute evidenţiază faptul că forţa de tăiere variază direct proporţional cu variaţia vitezei de tăiere, adică la viteze mari de tăiere sunt necesare forţe de tăiere mari, excepţie făcând rahatul alimentar unde valori mari ale forţei de tăiere s-au obţinut la viteze mici de tăiere acest lucru datorându-se structurii omogene a acestui tip de material. Textura produsului precum şi tipul, forma organului de lucru influenţează semnificativ produsul final, astfel din rezultatele obţinute în urma cercetărilor experimentale dezvoltate au arătat că: pierderi mari de suc s-au obţinut la mărunţirea căpşunilor iar la brânzeturi s-au înregistrat pierderi semnificative de material, de asemeni pentru această categorie de produse suprafaţa obţinută în urma mărunţirii prezintă multe asperităţi. Aderenţa materialului la organul de lucru s-a putut observa la mărunţirea rahatului şi chiar a bananelor. THE STUDY TO OBTAINING THE TRAJECTORIES OF SOLID PARTICLES ON AN OSCILLATORY FLAT SURFACE BY EMILIAN MOŞNEGUŢU ∗ , VALENTIN NEDEFF, OVIDIU BONTAŞ, NARCIS BÂRSAN and DANA CHIŢIMUŞ Received: Accepted for publication: „Vasile Alecsandri” University of Bacău, Abstract. In this article presents a method to determine the trajectory of a real particle on an oscillating surface. A special attention was given to recording the mode of trajectory and for this purpose we used two cameras of the same type. Tridimensional trajectory of the particle on the oscillating surface was achieved through SyntEyes program. And been it was also determine the real speed of the particle. Key words: flat surface oscillatory motion, the particle trajectory. ∗ Corresponding author: e-mail: emos@ub.ro
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 291 1. Introduction Vegetable products from agriculture and some of the products resulting from various industrial processes (grinding, granulating, briquetting etc.) is a heterogeneous mixture. To separate such a mixture may use different methods, which are chosen taking into account the nature of the system and its properties (phase discontinuous nature, size, temperature etc.) (Moşneguţu et al., 2007). Separation of a mixture of solid particles on their size difference is the most popular method, used to both cleaning and sorting mixtures of particles (Nedeff et al., 2001). The separations of solid particles by size represent the most old separation technology and we find many studies about it. But the most significant studies have been done by Brereton and Dymott in 1973, Rose and English in 1973, De Pretis in 1977 and Ferrara in 1988, studies which aim, in especially, to increase the efficiency of separation (Tsakalakis, 2001), (Soldinger, 1999). However the separation of solid particles by size is not well known, in the specialty literature, have appeared three trends to study this process: - experimental studies (Trumic, 2011); - theoretical studies (Soldinger, 2002), (Li et al., 2003), (Stoicovici et al., 2008), (Szymański et al., 2003), (Xie, 2007); - studying the process through the simulation (Dong, 2009), (Zhao, 2010), (Jianzhang & Xin , 2012) . From specialty literature study is established that the process separation of solid particles after their size depends on several factors (Tsakalakis, 2001): - size and shape aperture sieve; - particle size and form; - moisture particles undergo the process of separation; - intensity of vibration, respectively frequency and amplitude; - quantity of material that is fed sieve; - sieve length. These factors also influence the behavior of solid particle on to surface oscillating respectively its trajectory. 2. Materials and equipment In the specialty literature there are very few experimental determinations which involving the use of real particles to determine the trajectory and speed of movement thereof on an oscillating surface. Therefore, the experimental determinations have performed using real particles, respectively particles of beans and using the worksheet - Triplot was determined form of these types of solid particle (Fig. 1).
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