Which type of windowing or filtering to apply for obtaining the right shape of FRF?

Hi! I have calculated and plotted the point FRF. As an excitation I have used a half-sin force.Should I consider to use windowing prior fft, because I just have one peak on the plot? All comments are welcome.

Thanks!

%Number of samples N = length(acc);

%Sampling frequency in Hertz fs = N/T;

% FFT of acceleration

NFFT = 2^nextpow2(N); ACC = fft(acc(11,:),NFFT)/N; ACC_abs = 2*abs(ACC(1:NFFT/2+1));

f1 = fs/2*linspace(0,1,NFFT/2+1);

% FFT of force vector

PSIN = fft(Psin(11,:),NFFT)/N; PSIN_abs = 2*abs(PSIN(1:NFFT/2+1));

f2 = fs/2*linspace(0,1,NFFT/2+1);

% Plotting force and acceleration in frequency domain figure

subplot (1,2,1); grid on; plot(f1,ACC_abs) xlabel('Frequency (Hz)') ylabel('ACC(f)')

subplot (1,2,2); grid on; plot(f2,PSIN_abs) xlabel('Frequency (Hz)') ylabel('PSIN(f)')

% Calculating point FRF FRF66 = ACC_abs./PSIN_abs;

% FRF in decibels FRF66db = 10*log10(FRF66);

% Plotting point FRF figure semilogx(fs/2*linspace(0,1,NFFT/2+1),FRF66db)

grid on title ('FRF 66') xlabel('Frequency (log)') ylabel('Amplitude (dB)')